Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system

//Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system
Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system

Project Description

Product overviews:

Battery Active Equalizer (EJ-B1A24S/ EJ-B2A24S) is a balanced solution for large-capacity series lithium battery packs Management system.The equalizer uses a supercapacitor as a medium to achieve active energy transfer equalization.

The equalizer is suitable for 2 to 24 strings of battery packs with voltage acquisition and equalization. The equalizer works for 1A The equalized current is used for energy transfer, and the equalization current does not depend on the voltage difference of the series connected cells in the battery pack. Voltage acquisition range1 V ~ 5V, accuracy ± 3mV. Applicable to all kinds of batteries on the market such as lithium iron phosphate, ternary lithium, titanic acid, lithium lead acid, etc.

The equalizer has a Bluetooth communication function and is equipped with mobile APP software. Can be viewed via Bluetooth connected equalizer Single cell voltage, view equalization status, modify setup parameters, etc. Can be applied to small sightseeing cars, scooters,Enjoy battery, battery power, base station backup power, solar power station and other products in the battery PACK, can also be used for batteries

Balance maintenance, repair and other occasions.

More opions for active battery cell balancer 5A, 10A are avaliable @

2. Main technical parameters:

2.1 Main Specifications

◆ Support 2~24 strings of battery packs;

◆ Real-time, active, energy transfer equalization, after the balance is reached, the pressure difference between the cells is ≤ 3mV;

◆ Single voltage range 1V ~ 5V, accuracy ± 3mV;

◆ Support all battery types such as ternary, iron lithium, lead acid, super capacitor;

◆ The equalization current is set independently in the range of 0.1~2A, independent of the cell voltage difference;

◆ Support balanced cascading to apply to more than 24 series of battery packs, in theory, can be cascaded indefinitely;

◆ Bluetooth communication function, equipped with APP, to view the state of the battery in real time;

◆ Equilibrium line resistance detection, abnormal contact failure is found in advance;

◆ Power supply range: 40V~100V

◆ Low voltage shutdown function to prevent battery damage.

2.2 Use of environmental conditions

  1. a) Operating temperature range: -20 ° C ~ 70 ° C;
  2. b) Power requirements: 40~100V, can be self-powered by battery or external power supply.
  3. c) Power consumption: Equilibrium state 10mA@100V, unbalanced state 6mA@100V.


EJ-B1A24S/EJ-B2A24S equalizer size is 162mm × 100mm × 20mm, shape and mounting hole position size

As shown in Figure 2.

EJ-B1A24S EJ-B2A24S equalizer size

3 Connector and interface description

3.1 Connector, LED position description

The connector and LED position are shown in Figure 1.

Connector, LED position description

3.2 Connector, LED Definition Description

The connector definition and LED definition are shown in Table 1.

Table 1 Connector definition

ConnectorPin No.NameDefinition
P11GNDBattery Total Negative Polar
2B1Cell1 Positvie Polar
3B2Cell2 Positvie Polar
4B3Cell3 Positvie Polar
5B4Cell4 Positvie Polar
6B5Cell5 Positvie Polar
7B6Cell6 Positvie Polar
8B7Cell7 Positvie Polar
9B8Cell8 Positvie Polar
10B9Cell9 Positvie Polar
11B10Cell10 Positvie Polar
12B11Cell11 Positvie Polar
13B12Cell12 Positvie Polar
14B13Cell13 Positvie Polar
15B14Cell14 Positvie Polar
P21B15Cell15 Positvie Polar
2B16Cell16 Positvie Polar
3B17Cell17 Positvie Polar
4B18Cell18 Positvie Polar
5B19Cell19 Positvie Polar
6B20Cell20 Positvie Polar
7B21Cell21 Positvie Polar
8B22Cell22 Positvie Polar
9B23Cell23 Positvie Polar
10B24Cell24 Positvie Polar
11PWREqualizer power supply, can be connected to the postive for any section of 13~24S

;can also be connected to a 40-100V DC External power supply.

4. Installation methods and precautions

4.1 Unpacking inspection and precautions

Unpacking inspection and precautions are as follows:

  1. a) Handle the packaging box, equalizer, etc., and try not to invert it;
  2. b) Pay attention to whether the packaging is intact before unpacking, if there is any impact mark, whether it is damaged or not;
  3. c) Take adequate anti-static measures, such as wearing anti-static clothing, wearing anti-static gloves, and wearing an anti-static wrist strap.

After fully discharging, open the antistatic bag and take out the equalizer to check if the equalizer looks good.

4.2 Single equalizer installation

A single EJ-B1A24S/EJ-B2A24S equalizer is suitable for battery packs with 2-24 strings of batteries in series. But when the battery pack

When the voltage is lower than 40V, the equalizer needs to provide external DC 40V~100V power supply.

For a battery pack with 24 strings of batteries connected in series, the wiring method is shown in Figure 3.

Figure 3 24S battery wiring diagram

Apply the equalizer to less than 24S cells. The wiring method is shown in Figure 4 (20S shown).

Figure 4 20S battery wiring diagram

Apply the equalizer to a battery pack with a voltage lower than 40V. The wiring method is shown in Figure 5. (The figure is matched with 3S.The boost module is an example).

Figure 5 Wiring diagram with the boost module

Apply the equalizer to a battery pack with a voltage lower than 40V. The wiring method is shown in Figure 6 (the figure is shown with 3S and external power supply).

Figure 6 External power supply wiring diagram

4.3 Multiple Equalizer Cascading Installation

The EJ-B1A24S/EJ-B2A24S equalizer supports cascading, which allows the equalizer to be applied to more than 24 strings of battery packs. The cascading installation wiring diagram is shown in Figure 7.

Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system 1

  1. Use and operation

5.1 Preparation and inspection before use

Before turning on the power, please confirm whether the equalization line connection is normal, whether the power supply provided to the equalizer is within the required range, check whether the equalizer has been placed securely, and confirm whether the circuit board is short-circuited or not. Turn on the power of the equalizer, otherwise it may cause serious consequences such as abnormal operation or even burning.

5.2 Equalizer power-on work

After confirming that the above operation is correct, you can power on the equalizer. The EJ-B1A24S/EJ-B2A24S type equalizer does not have a power-on control switch. It only needs to connect the power cable to the terminal. The equalizer will start working automatically. The equalizer is designed for automatic operation. The first power-on condition is that the first battery voltage of the battery pack is higher than 2.4V.

5.3 APP Operating Instructions

Download app

Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system 2

Bluetooth balancer Battery Active Equalizer for large-capacity series lithium battery packs Management system 3

5.3.1 Equipment operation

  1. a) Device connection

First turn on the phone Bluetooth, then open the APP, as shown in Figure 9.

Click the icon in the upper left corner to scan the device. The first time you connect to the APP, you will be prompted to enter the password. The default password of the device is “1234”. After the device is connected, the APP will automatically record the password. You do not need to enter the password for the next connection. After the APP is opened, the password is automatically connected. The interface is shown in Figure 10.

The interface is shown in Figure 10.

  1. b) Change password and name

After the device is connected, click the pen icon on the right side of the device list to modify the device name and password.

Modify the device name interface as shown in Figure 11. Note that the device name only supports English or numbers, and does not support Chinese names and Chinese characters.

The modify password interface is shown in Figure 12. 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 option for entering the new password. After entering the new password twice, select Confirm to complete the device password modification.

entering the new password twice, select Confirm to complete the device password modification

5.3.2 Status View

The real-time status interface is shown in Figure 13.

Figure 13

On the real-time status page, you can view information such as cell voltage, total battery voltage, maximum differential voltage, average cell voltage, equalization state, equalization current, and equalization line resistance.

5.3.3 Parameter Settings

The parameter setting page is shown in Figure 14.

In the parameter setting page, parameters such as the number of cells, the single cell identification voltage, the trigger equalization voltage difference, the maximum equalization current, the automatic shutdown voltage, and the voltage acquisition reference can be set.

5.3.4 BMS Control

The BMS control page is for an equalizer with battery output protection. The EJ-B1A24S/EJ-B2A24S equalizer does not have this function and the page is empty.

Figure 14 Real-time status display

  1. General fault analysis and elimination

The cause and treatment of the fault are shown in Table 2

No.Symptom CauseAnalysisRemedyRemarks
1The power indicator is offThe equalizer does not supply power properly.Check that the power pins on the P2 connector are plugged into the power supply.
2The number of APP prompts is not the same as the set value.The number of single settings is incorrect or the equalization line connection is abnormal.Check that the number of unit settings is the same as the number of batteries connected.
3APP prompts that the equalization line resistance is too largeBattery to connector line resistance is too largeCheck the battery unit to connector connector for poor contact, otherwise replace the wire.
4Inaccurate voltage acquisitionWiring error or incorrect parameter settingCheck the connection exclusion connection errors one by one. Fine-tune through the voltage acquisition reference until the acquisition is accurate.
5Equalizer does not bootThe equalizer does not meet the working conditionsCheck if the voltage of the first string of batteries is higher than 2.4V. If the conditions are not met, please charge the battery to 2.4V or higher, then the equalizer will automatically turn on.

Listed above are common faults, possible causes and solutions. If the fault has not been corrected, please contact us.

  1. Safety protection measures and precautions

The equalizer itself does not have high voltage, and it will not cause electric shock damage to the body.

The equalizer has static-sensitive components that require anti-static protection. If it is not operated properly, it will cause damage to the equalizer. If you need to operate the equalizer, please pay attention to the following instructions:

  1. a) Before touching the PCB, the person performing the operation must discharge static electricity and take anti-static measures;
  2. b) the equalizer is not allowed to come into contact with clothing made of electrically insulating material – plastic film, insulated table top or rayon;
  3. c) When performing welding work on the equalizer, make sure that the soldering iron tip is grounded;
  4. d) If non-conductive containers are inevitably used, they must be packaged with a conductive material, such as conductive foam rubber or plain aluminum foil, before placing the PCB.
  1. Transportation and storage

8.1 Transportation

The packaged product can be transported by ordinary means of transport without being directly affected by rain or snow and violently colliding with bumps. It is not allowed to put together with corrosive substances such as acid and alkali during transportation.

8.2 Storage

Packaged products should be stored in a permanent warehouse. The temperature of the warehouse is 0 °C ~ 35 °C, the relative humidity is not more than 80%. There should be no acid and alkali and corrosive gas in the warehouse, no strong mechanical vibration and impact, no strong magnetic field.