LIFEPO4 / LITHIUM ION / LTO

BMS IN ONE
14-20S1A100A/ 14-24S1A150A /14-24S2A200A

MANUAL

1 Overview
The intelligent BITEK BMS LITHIUM ION/LIFEPO4/LTO is a management system specially
designed for large-capacity series SMART battery packs. which has the functions of voltage acquisition,
high current active balance, overcharge, over discharge, over current and over temperature protection,
coulomb counter, Bluetooth communication, GPS remote, etc.
Based on the energy transfer active balance technology with independent intellectual property rights,
the protection board can achieve the maximum continuous 2A balance current. High current active balance
technology can guarantee the battery consistency, improve the battery life and delay the battery aging to
the greatest extent.
The protection board has a supporting mobile app, supporting Android and IOS operating systems.
The app can be connected to the protection board via Bluetooth to check the battery working status,
modify the working parameters of the protection board, control the switch of charging and discharging,
etc. The protection panel is small in size, simple in operation and full in function, which can be widely
used in battery pack of small sightseeing bus, scooter, shared car, high-power energy storage, base station
standby power supply, solar power station and other products.

2 Main Technical Parameters

2.1 Main Technical Indicators
The main technical indicators of the protection board are shown in Table 1.

Product model
Technical index
14-20S1A100A 14-24S1A150A 14-24S2A200A

Number of battery strings

(ternary lithium) 3.7V CELLS 14～20S 14～24S 14～24S

Number of battery strings

(iron lithium) 3.2V CELLS 16～20S 16～24S 16～24S
 Number of battery strings
(lithium titanate) LTO 20S 20～24S 20～24S

Entry cable Same port

Single voltage range 1～5 V

Voltage acquisition accuracy ±5 mV

Continuous discharge current 100A 150A 200A

Maximum discharge current 200A 300A 350A

balance mode Active balance

Equalizing current 0.6 A 1A 2A

Main circuit conduction internal

resistance 0.8mΩ 0.5mΩ 0.5mΩ

Overcharge protection voltage 1.2～4.25 V adjustable

Overcharge release voltage 1.2～4.25 V adjustable

Charging overcurrent protection

(adjustable) 10～100 A 10～150 A 10～150 A

2～120S adjustable
Discharge time of charging overcurrent

Over discharge protection voltage 1.2～4.25 V adjustable

Overdischarge recovery voltage 1.2～4.25 V adjustable

Discharge overcurrent protection

(adjustable) 10～100 A 10～150 A 10～150 A

Discharge overcurrent release time 2～120S adjustable

Number of temperature detection 3

Temperature protection yes

 Short circuit protection yes

Coulomb meter yes

Bluetooth function Support Android and IOS

GPS remote (optional) yes

Other interfaces (customized) RS485/CAN

Table 1. Main technical indicators of protection board

2.2 Application Environment

a) Operating temperature range: - 20 ℃ ~ 70 ℃;
b) Power requirements: 40 ~ 100V.
c) Power consumption: 10mA @ 100V in balanced state and 6mA @ 100V in unbalanced state.

3 Connector and Interface Description

3.1 Connector and LED Position Description
The location of connectors and LED lights is shown in Figure 1.

FIG. 1 Connector Diagram

3.2 Connector and LED Definition Description

Table 2 for connector definition and LED light definition.
 14-20S1A100A 14-24S1A150A /14-24S2A200A
Connector Pin No.
Name Definition Name Definition
Total battery
1 B- B- Total battery negative
negative
2 B1 Cell 1 Positive B1 Cell 1 Positive
3 B2 Cell 2 Positive B2 Cell 2 Positive
4 B3 Cell 3 Positive B3 Cell 3 Positive
5 B4 Cell 4 Positive B4 Cell 4 Positive

P1 6 B5 Cell 5 Positive B5 Cell 5 Positive

7 B6 Cell 6 Positive B6 Cell 6 Positive
8 B7 Cell 7 Positive B7 Cell 7 Positive
9 B8 Cell 8 Positive B8 Cell 8 Positive
10 B9 Cell 9 Positive B9 Cell 9 Positive
11 B10 Cell 10 Positive B10 Cell 10 Positive
12 B11 Cell 11 Positive B11 Cell 11 Positive
13 B12 Cell 12 Positive B12 Cell 12 Positive
14 B13 Cell 13 Positive B13 Cell 13 Positive
15 B14 Cell 14Positive B14 Cell 14Positive
1 B15 Cell 15 Positive B15 Cell 15 Positive
2 B16 Cell 16 Positive B16 Cell 16 Positive
3 B17 Cell 17 Positive B17 Cell 17 Positive
4 B18 Cell 18 Positive B18 Cell 18 Positive
5 B19 Cell 19 Positive B19 Cell 19 Positive
6 B20 Cell 20 Positive B20 Cell 20 Positive
P2
Protection board
7 B+ B21 Cell 21 Positive
power
8 - - B22 Cell 22 Positive
9 - - B23 Cell 23 Positive
10 - - B24 Cell 24 Positive
11 - - B+ Protection board power
1 T1A 1st temperature sensor A pin
2 T1B 1st temperature sensor B pin
P3
3 T2A 2nd temperature sensor A pin
4 T2B 2nd temperature sensor B pin
Bluetooth connection indicator. When the protection board is connected to
D1
Bluetooth, the indicator is always on. When disconnected, the indicator blinks.
C- Connect external load or charger negative
B- Connected to electric core negative
Table 2. Connector Definition

3.3 Product Appearance

The product appearance is shown in Figure 2.

Figure 2. Product Display

3.4 Size

The size of 14-20S1A100A protection board is 158.4mm × 79.4mm × 14.8mm, and its
dimensions are shown in Figure 3.

FIG 3. Outline Dimension Diagram of 14-20S1A100A

 The size of 14-24S1A150A /14-24S2A200A protection board is 161.4mm × 101.4mm ×
17.95mm, and the overall dimension is shown in Figure 4.

FIG 4. Outline Dimension Drawing of 14-24S1A150A /14-24S2A200A

3.5 Weight
The weight of 14-20S1A100A about 400g.
The weight of 14-24S1A150A /14-24S2A200A about 550G.
4 Installation Methods and Precautions
4.1 Unpacking Inspection and Precautions
Unpacking inspection and precautions are as follows:
a) The packing box and protection board shall be handled with care and not inverted as far
as possible;
b) Before unpacking, pay attention to whether the package is in good condition, such as
whether there are impact marks, damage, etc;

4.2 Wiring Diagram

The intelligent lithium battery protection board is suitable for 14-24 series of lithium battery
packs and the battery pack wiring method is different for different numbers of batteries.
For a battery pack with 24 strings in series, the installation and wiring method is shown in Figure
5.
 BITEK SMART BMS

FIG. 5 24S Battery Wiring Diagram

 23
6.

BITEK SMART BMS

FIG. 6 23S Battery Wiring Diagram

For a battery pack with 22 strings in series, the installation and wiring method is shown in Figure
7.

BITEK SMART BMS

FIG. 7 22S Battery Wiring Diagram

20
 8.

BITEK SMART BMS

FIG. 8 20S Battery Wiring Diagram

For a battery pack with 17 strings in series, the installation and wiring method is shown in Figure
9.

BITEK SMART BMS

FIG. 9 17S Battery Wiring Diagram

16 10.
 BITEK SMART BMS

FIG. 10 16S Battery Wiring Diagram

For a battery pack with 14 strings in series, the installation and wiring method is shown in Figure
11.

BITEK SMART BMS

FIG. 11 14S Battery Wiring Diagram

4.3 App installation

Please ask customer service for the app.5 Use and operation
5.1 Preparation and inspection before use

Before turning on the protection board, please confirm whether the balance line is connected
normally and whether "C-" and "B-" are connected correctly. Check whether the protection board
is securely fixed to the battery core, and then you can switch on the protection board after
confirming that it is correct. Otherwise, it may cause serious consequences such as abnormal
operation and even burnout.

5.2 Power on of protection board

After confirming that the above operations are correct, you can power on the protection board.
The protection board does not have a power-on control switch, and is designed to be in a charging
activation mode. That is, after the battery is assembled, a charger needs to be connected to start the
protection board.

5.3 App operating instructions

5.3.1 Equipment operation a) Equipment connection

First turn on the mobile phone's Bluetooth, and then open the APP, as shown in Figure 13. Click
the icon in the upper left corner to scan the device. After the scan is completed, click the name of
the device to be connected, such as "JK-B1A24S". The APP will prompt for a password when
connecting for the first time. The default password of the device is "1234". The APP will
automatically record the password after the device is connected. There is no need to enter the
password for the next connection. It will automatically connect after starting the APP, The
password input interface is shown in Figure 14.

FIG. 13 Device Scan FIG. 14 Password Input

b) Change name and password
After the device is connected, click the "pen type" icon on the right side of the device list to
modify the device name and password.
The interface for modifying the device name is shown in Figure 15. Note that the device name
only supports English or numbers.
The password change interface is shown in Figure 16. To change the device password, you
must first enter the old password of the device. Only when the current password is correct can you
enter the new password entry option. After entering the new password twice, click ‘OK’ to
complete the device password modification.

5.3.2 Status View

The real-time status interface is shown in Figure 17.

FIG.17 The Real-time Status

The real-time status page is divided into three areas.

Area 1 in the figure is battery comprehensive information column. The parameters are defined
as follows:
a) Time
The time indicates the total running time from the time the protection board is turned on until
now.
b) Charging
Indicates the opening status of the current protection board charging MOS. When "on" is
displayed, it means that the current protection board charging MOS is on and the battery is allowed
to charge; when "off" is displayed, it means that the current protection board charging MOS is off
and the battery is not allowed to charge.
c)Discharge
Indicates the open status of the current protection board discharge MOS. When "on" is
displayed, it means that the current protection board discharge MOS is on and the battery is allowed
to discharge; when "off" is displayed, it means that the current protection board discharge MOS is
off and the battery is not allowed to discharge.
d) Balance
Indicates the on / off status of the protection board. When "On" is displayed, the protection
board will automatically balance after the balance starting conditions are met; when "Off" is
displayed, it means that the balance is off, and the protection board will not balance the
battery. e) Voltage
The voltage area displays the current total voltage of the battery in real time, and the total voltage
is the sum of all unit voltages.
f) Current
The current area displays the total current of the current battery in real time. When the battery is
charging, the current is positive, and when the battery is discharging, the current is negative. g)
Battery Power
Represents the total power of the current battery output or input. Its value is the product of the
current battery voltage and the absolute value of the battery current.
h) Remain Battery
Represents the percentage of current battery power remaining.
i ) Battery Capacity
Represents the actual battery capacity calculated by the current protection board based on the
high-precision SOC. The unit is AH. (The value needs to be updated after the battery has
completed a full discharge and charge cycle)
j) Remain Capacity
Remaining capacity indicates the remaining capacity of the current battery, unit: AH. k)
Cycle Capacity
The cycle capacity indicates the cumulative discharge capacity of the battery, and the unit is
AH.
l) Cycle Count
The Cycle Count indicates the number of charge saturation times of the current battery, the
unit is: times.
m) Ave. Cell Vol.
The average cell voltage of the current battery, unit: V.
n) Delta Cell Vol.
The Delta Cell Vol. represents the difference between the highest battery voltage and the
lowest battery voltage of the entire battery pack. The unit is V.
o) Balance Cur.
When the protection board turns on the balance function and reaches the balance condition, it
displays the balance current in real time. Unit: A.
When the balance is performed, the status display area of the real-time status, blue represents
a discharged battery, and red represents a charged battery.
When balance is in progress, the status display area of the real-time status, blue represents the
discharged battery, and red represents the charged battery. The negative current of balance current
indicates that the battery is discharging. At this time, the blue flashes. The positive current of
balance current indicates that the battery is charging. At this time, the red flashes.
Active balance technology is used in the protection board. The principle of balance is to take
power from the high-voltage core, store it in the protection board, and then put it into the low-
voltage core.
p) MOS Temp
Real time display of the temperature of current protection board power MOS, unit: ℃. q)
Battery T1
Display "Na" when the temperature sensor 1 is not installed, and display the temperature of
the temperature sensor 1 in real time when the temperature sensor is installed, unit: ℃.
 r) Battery T2
Display "NA" when the temperature sensor 2 is not installed, and display the temperature of
the temperature sensor 2 in real time when the temperature sensor is installed, unit: ℃.
In the figure, area 2 is the voltage area of single body. The voltage data of each cell in the
battery pack is displayed in real time, in which red represents the cell with the lowest voltage and
blue represents the cell with the highest voltage.
Area 3 in the figure is the area of cells wire resistance. The cells wire resistance is obtained
by the self inspection of the protection board. The value is only a preliminary calculation to prevent
wrong connection or poor contact. When the cells wire resistance exceeds a certain value, it will
be displayed in yellow, and the balance cannot be turned on at this time.

5.3.3 Parameter Setting

The parameter setting page is shown in Figure 18.

FIG.18 Parameters Setting

 In the parameter setting page, you can modify the working parameters of the protection board.
The definitions of each parameter are as follows.
a) LIFFPO4
This function button can modify all the working parameters of the protection board into the
parameters of the iron-lithium battery. For the default values of the parameters, see Appendix I. b)
LI-ION
This function button can modify all the working parameters of the protection board into the
parameters of the iron-lithium battery. For the default values of the parameters, see Appendix II.

c) Cells Count
The cells count represents the number of cells in the current battery. Before use, please set this
value accurately, otherwise the protection board will not work properly.
d) Battery Capacity
This value is the design capacity of the battery. e)
Trigger Diff Volt
Triggered balance difference Voltage is the only parameter that controls balance. When the
balance switch is on, when the maximum difference voltage of the battery pack exceeds this value,
the balance starts, and the balance ends when the difference voltage is lower than this value. For
example, the balance trigger voltage difference is set to 0.01V. When the battery pack voltage
difference is greater than 0.01V, balance is started, and when the battery pack voltage difference is
lower than 0.01V, the balance is ended. (It is recommended that the balance trigger difference
voltage of the battery above 50AH is 0.005V, and the balance trigger difference voltage of the
battery below 50AH is 0.01V)
f) Voltage Calibration
The voltage calibration function can be used to calibrate the accuracy of the equalizer voltage
acquisition.
When there is an error between the total voltage collected by the protection board and the total
voltage of the battery, you can use the voltage calibration function to calibrate the protection board.
The calibration method is to fill in the total battery voltage that is currently measured, and then
click "Small Plane" behind the voltage calibration to complete the calibration.
g) "Cell UVP" and "Cell UVPR"
"Cell Low-voltage Protection" refers to the cut-off voltage of the battery cell. As long as the
voltage of any cell in the battery pack is lower than this value, the "Cell Low-voltage Alarm" will
be generated. At the same time, the protection board will turned off to discharge MOS, at this time,
the battery can not discharge, but can only charge.When the alarm occurs, only after the voltage of
all the cells exceeds the value of "Cell Voltage Recovery" the protection board releases the "Cell
Low-voltage Alarm" and turns on the discharge MOS at the same time.
h) "Cell OVP", "Cell OVPR"
"Cell OVP" refers to the saturation voltage of the cell. As long as the voltage of any single
cell in the battery pack exceeds this value, a "single overcharge alarm" will be generated. At the
same time, the protection board will turn off the MOS for charging. At this time, the battery cannot
be charged and can only be discharged. After the alarm is generated, only when the voltage value
of all cell is lower than the value of "Cell OVPR", the protection board will release the "cell
overcharge alarm" and open the charging MOS at the same time.
i ) Power Off Vol.
The Power Off Vol. indicates the lowest working voltage of the protection board. When the
highest voltage of the cell in the battery pack is lower than this value, the protection board is closed.
The value must be lower than "unit low-voltage protection".
j) "Max Charge Curr.", "Charge OCP Delay", "Charge OCPR Time"
When charging the battery pack, if the current exceeds the "Max Charge Curr" and the duration
exceeds the time of "Charge OCP Delay", the protection board will generate "charging over-current
alarm" and turn off the charging MOS at the same time. After the alarm is generated, after the time
of "Charge OCPR Time", the protection board will release the charging over-current alarm and
restart the charging MOS.
For example, set "Max Charge Curr." as 10A, "Charge OCP Delay" as 10s, "Charge OCPR
Time" as 50s. In the charging process, if the charging current exceeds 10A continuously for 10
seconds, the protection board will generate "charging over-current alarm" and close the charging
MOS. 50 seconds after the alarm is generated, the "charging over-current alarm" will be released.
At the same time, the protection board will restart the charging MOS.
k) "Max Discharge Curr.", "Discharge OCP Delay", "Discharge OCPR Time"
When the battery pack is discharged, when the current exceeds the "Max Discharge Curr." and
the duration exceeds the time of "Discharge OCP Delay", the protection board will generate a
"discharge over-current alarm" and close the discharge MOS at the same time. After the alarm is
generated, after the time of "Discharge OCPR Time", the protection board releases the "discharge
over-current alarm" and turns on the discharge MOS again.
For example, set "Max Discharge Currt" as 100A, "Discharge OCP Delay" as 10s, "Discharge
OCPR Time" as 50s. During the discharge process, if the discharge current exceeds 100A
continuously for 10 seconds, the protection board will generate a "discharge over-current alarm"
and turn off the discharge MOS. 50 seconds after the alarm is generated, the "discharge over-current
alarm" will be released, and the protection board will restart the discharge MOS.
l) SCPR Time
When the short-circuit protection occurs, the short-circuit protection will be released after the
set time of "SCPR Time".
m) Max Balance Cur.
The balance current represents the continuous current of high-voltage battery discharge and
low-voltage battery charging in the process of energy transfer.
The maximum balance current is the maximum current in the process of energy transfer, and
the maximum balance current should not exceed 0.1C. For example: 20Ah battery shall not exceed
20 * 0.1 = 2A.
n) "Charge OTP", "Charge OTPR"
During the charging process, when the battery temperature exceeds the value of "Charge
OTP", the protection board will generate a "charging over temperature protection alarm", and the
protection board will turn off charging MOS. After the alarm is generated, when the temperature
is lower than "Charge OTPR", the "charging over temperature protection alarm" will be released,
and restart the charging MOS.
o) "Charge UTP", "charge UTPR"
During the charging process, when the battery temperature is lower than the value of "Charge
UTP", the protection board will generate a "low temperature protection for charging alarm" , and
the protection board will turn off the MOS for charging. After the alarm is generated, when the
temperature is higher than "charge UTPR", the protection board will release the warning of "low
temperature protection of charging alarm" and restart the MOS of charging.
p) "MOS OTP", "MOS OTPR"
When the MOS temperature exceeds the value of "MOS OTP", the protection board will
generate "MOS over temperature alarm" and close the charge discharge MOS at the same time.
The battery cannot be charged or discharged. After the alarm is generated and the MOS temperature
is lower than the value of "MOS OTPR", the protection board will release the "MOS over
temperature alarm" and restart the charge and discharge MOS (the MOS over temperature
protection value is 100 ℃, the MOS over temperature recovery value is 80 ℃, these two values
are factory default values and cannot be modified).
Attention:
Any parameter modification, please refer to the manual, improper parameters may
make the protection board can not work properly, or even burn the protection board.
 After any parameter is modified, you need to click "small aircraft" behind the
parameter to complete parameter distribution. After the equalizer successfully receives the
parameter, it will send out a "drip" sound.

5.3.4 BMS Control

The BMS control page is shown in the figure 19. Through BMS control, the charging function,
discharging function and balancing function of the protection board can be switched on and off,
and the power supply of the protection board can be closed and factory Settings can be restored.

6 Safety Protection Measures and Precautions

The protection board itself does not have high voltage, which will not cause electric shock to
the body.
Please read the instruction manual carefully before use, connect according to the correct
wiring diagram of different strings, and connect from the negative pole to the positive pole. After
the balanced wire is connected, confirm it with a multimeter again, and insert the protection board
after confirmation.
It is not allowed to modify the power line of the protection board without permission.
Unauthorized modification of the power line will cause the protection board to over-current and
burn the protection board.

7 Transportation and Storage

7.1 Transport

The products after packing are not directly affected by the rain, snow and violent bump, it can
be transported by normal means of transportation.It is not allowed to put together with acid, alkali
and other corrosive substances during transportation

7.2 Storage
The packed products shall be stored in a permanent warehouse with a temperature of 0 ℃ ~
35 ℃ and a relative humidity of no more than 80%.There should be no acid, alkali and corrosive
gas in the storeroom, no strong mechanism vibration and shock, and no strong magnetic field.

Lithium Iron Ternary Lithium

Number Parameter Unit
Default Default

1 Cell Low-voltage Protection 2.500 2.800 V

Cell Low-voltage Protection

2 2.650 3.200 V
Recovery

3 Cell Overcharge Voltage 3.65 4.25 V

Cell Overcharge Protection

4 3.6 4.2 V
Recovery
Trigger Balance Differential
5 0.01 0.01 V
Voltage
6 Power Off Voltage 2.5 2.799 V

7 Charge Over-Current Protection 25.0 25.0 A

Charge Over-Current Protection

8 30 30 s
Delay
Charge Over-Current Protection
9 60 60 s
Delay Recovery Time
Discharge Over-Current
10 100.0 100.0 A
Protection
Discharge Over-Current
11 30 30 s
Protection Delay
Discharge Over Current
12 60 60 s
Protection Recovery Time
Short Circuit Protection
13 60 60 s
Recovery Time

14 Maximum Balance Current 1.0 1.0 A

Charge Over Temperature

15 70 70 ℃
Protection
Charging Over Temperature
16 60 60 ℃
Protection Recovery
Discharge Over Temperature
17 70 70 ℃
Protection
Discharge Over Temperature
18 60 60 ℃
Protection Recovery
Charging Low Temperature
19 -20 -20 ℃
Protection
Charging Low Temperature
20 -10 -10 ℃
Protection Recovery
MOS Over Temperature
21 100 100 ℃
Protection

MOS Over Temperature

22 80 80 ℃
Protection Recovery

23 Cell Count 24 24 S

24 Charge Switch off off -

25 Discharge Switch off off -

26 Balance Switch off off -

27 Battery Capacity 40 40 AH

BITEK 429,OPAL ST. FILLOVILLE ,CALAUAG,NAGA CITY,4400 PHILLIPINES conprocare@gmail.com