1、Bluetooth related
No.
Common faults
Root cause of the problem
Direction of investigation
01 
Bluetooth flash back
APP calculation error
It is necessary to connect to the upper computer and verify whether the set parameters are correct in the configuration parameters
02 
Unable to connect to Bluetooth
Need specific analysis of the problem
1. The phone positioning is not turned on;
2. Confirm whether the protection board is activated;
3. Check if there are any defects in the Bluetooth wire;
4. Check if the Bluetooth module is defective;
5. It is possible that the protective board has been damaged
03 
Bluetooth password display error
The customer entered an error or forgot their password after changing it
You can extract the password from the Bluetooth error code prompt, starting from the 4th digit and counting every other digit, totaling 6 digits.
2、Communication
No.
Common faults
Root cause of the problem
Direction of investigation
01 
No data on the upper computer/Bluetooth APP
The protection board is not activated;

The first time the protection board is powered on, it needs to press the button to activate charging (the charging voltage is greater than the battery voltage by 2V);

02 
Parallel connection without data display
1. The upper computer board number is set incorrectly;
2. Program error
1. The board number needs to be set correctly;
2. Check if the protection board is flushed into the parallel communication program
03 
No data on the upper computer/Bluetooth APP
1. The protection board is not activated;
2. The communication line is damaged, short circuited or reversed;
3. Poor protection board
1. The first time the protection board is powered on, it needs to be activated by pressing the button or charging, and the charging voltage is greater than the battery voltage by 2V;
2. Check if the UART, 485, and CAN wires are loose, damaged, and if the wires are reversed;
3. Replace the protective board for testing to see if it is normal. If possible, it is best to cross confirm
3、Current problem
No.
Common faults
Root cause of the problem
Direction of investigation
01 
The current collection value has been consistently 0
Check if the B - and P-wiring harnesses are connected in reverse
Confirm if the B - and P-wiring harnesses are connected in the opposite direction
02 
Display false current when no-load
Damaged protective board
Use a multimeter to measure whether the resistance value from B0 to B - is between 10 Ω -20 Ω
03 
Large current collection error
1. Difference in current calibration points
2. Is the current collection resistor setting abnormal
1. Need to recalibrate (contact customer service for instructions)
2. It is necessary to calculate the sampling resistance value and then write the configuration parameters (contact customer service for the operation method)
4、Collection problem
No.
Common faults
Root cause of the problem
Direction of investigation
01 
Voltage collection 0V, adjacent voltage 4.999V or 5V
Voltage collection line disconnection

Check if the fixed position of the voltage collection line corresponding to the 0V voltage has good contact;

02 
Adjacent two series of single cell voltages, one high and one low
Poor contact of voltage collection line
1. Check if the connection between the collection line and the protection board connector is good, and if the collection line is connected to the battery pole terminal loose
2. If possible, it can be replaced and cross tested.
03 
One string of voltage is collected as 0V, while the other strings are collected normally
1. Configuration parameter error;
2. The collection line is disconnected;
3. The actual voltage is 0V
1. Use the upper computer and Bluetooth APP to read and confirm whether the parameter configuration is correct (such as the number of acquisition boards and individual units)
2. Confirm if the wiring harness is disconnected
3. Measure the actual voltage.
5、Temperature problem
No.
Common faults
Root cause of the problem
Direction of investigation
01 
Temperature -40 ℃
The temperature line is broken or the temperature probe is damaged, and the socket terminal is not in good contact;
1. Cut off the power and measure the resistance value of the temperature probe at the connector connected to the protection board to see if it is normal (about 10K (black temperature control) or 100K (red temperature control) at room temperature, and check if the wiring harness is broken;
2. Check if the wiring harness is worn and connected to the positive and negative poles of the battery cell;
3. Defective protective board, cross validation test.
02 
Large temperature difference
Poor contact of temperature line or damage to temperature probe
Measure the resistance value of the temperature probe at the connector connected to the protection board after power outage (about 10K (black temperature control) or 100K (red temperature control) at room temperature), and check if the wiring harness is worn before short circuiting.
6、SOC related
No.
Common faults
Root cause of the problem
Direction of investigation
01 
Incorrect SOC display
1. Is the rated capacity set correctly
2. Shallow charging and discharging tests
3. Incorrectness of SOC caused by high consistency of individual voltage
4. During discharge, SOC increases
5. SOC jump
1. Read the parameters of the protection board and check if the rated capacity is set correctly. It can be reset and tested
2. Have you conducted a complete charging and discharging cycle
3. Check all individual pressure differences (data at the end of charge and discharge)
4. B - and P-wiring harnesses are connected in reverse
5. Procedural issues
7、charge-discharge
No.
Common faults
Root cause of the problem
Direction of investigation
01 
Insufficient charging
1. Does the charger specifications match and can the voltage be reached
2. Is the battery consistency good
Does the total output voltage of the charger meet the requirements
2. Measure the individual voltage with a multimeter
02 
Unable to charge
1. Charging MOS not closed
2. Key switch and soft switch issues
3. Poor protection board
1. Use a multimeter to measure whether there is a voltage difference between B+and B -, and between B+and P -; View secondary alarm information (such as individual, temperature, and overcurrent secondary alarms) through the upper computer and Bluetooth APP
2. Check if the key switch and soft switch are invalid or not connected
3. Defective protective board, cross validation test
Online Service
corawen@100balancebms.com
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