Failure and repair method of 12v lithium battery

1、12v lithium battery has high voltage: After full recharge and put away for a while, the battery voltage obviously turns high, while the other monomer is normal.

The cause of the problem:

(1) sampling error;

(2) the LMU equilibrium function or failure;

(3) batteries capacity is low, charging voltage rise quickly.

Processing method:

(1) monomer voltage value displayed is the rest of the monomer is low, compare the actual measurement of monomer voltage value, if the actual value display value is high, and the same as the other monomer voltage, with the actual value for the standard calibration for LMU monomer voltage; If measured values match the display value, the artificial of monomer battery recharged balance.

(2) check whether the voltage sampling line is broken, virtual;

3. Replace the LMU;

(4) the failure to change the battery pack.

2, differential pressure, dynamic pressure differential/static pressure difference. When charging the monomer voltage rapidly until full electric voltage jump the gun; Discharge, monomer voltage lower than other string rapidly; Stop discharging, monomer voltage than the other string rises rapidly.

The cause of the problem:

1) connect battery bronze fastening nut loose;

(2) the junction surface dirt;

(3) batteries self-discharge rate;

(4) batteries welding connection bronze welding (caused by the string of single capacity low);

(5) the individual monomer batteries discharge.

Processing method:

(1) to tighten nut;

(2) remove junction surface foreign body;

(3) for single string of battery charge/discharge equilibrium;

(4) of the problem to change the battery pack.

4, voltage jump: electricity equipment operation or when charging, 12 vLithium electricityPool monomer voltage jump.

The cause of the problem:

(1) voltage acquisition loose line connection point;

(2) the fault LUM.

Processing method:

(1) for fastening connection point;

(2) the change of LMU.

Second, the temperature type of fault

1, thermal management failure;

(1) heating failure (heating);The temperature is lower than a certain value, when charging, heating don't open it.

The cause of the problem:

(1) the heating relay or the BMU failure;

(2) the abnormal heating or relay power supply circuit.

Processing method:

1) repair or replace the fan relay or the BMU failure;

(2) check repair abnormal power supply circuit.

(2) thermal fault (fan);After the temperature is higher than a value, the fan does not work.

The cause of the problem:

1) fan relay or the BMU failure;

(2) fan or relay abnormal power supply circuit.

Processing method:

1) repair or replace the fan relay or the BMU failure;

(2) check repair abnormal power supply circuit.

2, high temperature, battery system in a certain temperature or a few points on the high side, running or charge to alarm threshold.

The cause of the problem:

(1) temperature sensor fault;

(2) LMU fault;

(3) local heating electric connection exception;

(4) fan is not open, poor heat dissipation;

(5) near the motor heat source;

6. Charge.

Processing method:

(1) electric resistance temperature sensor and compare the display value, if the actual value display value is low, and the same as the other temperature, is on the basis of the actual value of LMU calibration temperature;

(2) tighten electrical connection point, clear join foreign body;

3. Ensure that the fan open;

(4) increase heat insulation material and heat source in isolation;

(5) to suspend operation for heat dissipation;6. Immediately stop charging;

All landowners replacement LMU.

3, low temperature, battery system in a certain or a few low temperature point, run or charge to alarm threshold.

The cause of the problem:

(1) temperature sensor fault;

(2) LMU fault;

(3) local heating anomaly.

Processing method:

(1) electric resistance temperature sensor and compare the display value, if the actual value display value is high, and the same as the other temperature, is on the basis of the actual value of LMU calibration temperature;

(2) check repair heating tablets;(3) change the LMU.

4, temperature difference; With reference to high and low temperature screening method. Batteries fever.

Third, charging failure

1, dc charging failure; GB/T27930-2015 won't start charging, charging jumping the gun, no longer a SOC after charging.

The cause of the problem:

1) battery failure (such as voltage, temperature, insulation)

(2) the BMU fault (charging module or CAN)

(3) the main negative abnormal, charging relay

(4) CC1 to ground resistance, CC2 of abnormal voltage

(5) PE to abnormal

Processing method:

1) battery failure

(2) to repair/replace the failure parts

(3) sequestration charging message, analyze the cause of the problem.

2, communication charge fault;

The cause of the problem:

1) battery failure (such as voltage, temperature, insulation)

(2) the BMU fault (charging module or CAN)

(3) the main negative abnormal, charging relay

(4) CC to ground resistance, the CP for abnormal voltage

(5) PE to abnormal

Processing method:

1) battery failure

(2) to repair/replace the failure parts

(3) sequestration charging message, analyze the cause of the problem.

Fourth, insulation fault

The cause of the problem: battery box or plug-in into the water, batteries leakage, environment humidity is big, insulation false positives, vehicle other high-voltage components (controller, compressor, etc.) the insulation.

Processing method: (1) the positive over the ground, if there is voltage or insulation resistance is less than the specified value, was sentenced to the cathode circuit leakage; Anode ground, if there is voltage or insulation resistance is less than the specified value, was sentenced to the anode circuit leakage. According to its leakage voltage divided by the size of a single string of voltage leakage point can be calculated, and then analysis according to different situations.

Five, the communication failures

LUM communication failures, BMU communication failures; The vehicle is one or several LMU information, or the vehicle information without BMS.

The cause of the problem:

1) LMU/BMU fault;

(2) the LMU/poor contact BMU power supply circuit or communications lines/fault;

(3) signal interference.

Processing method:

1) replace the LMU/BMU;

(2) check repair the power supply circuit/communications lines;

(3) check shielding line, find eliminate interference sources.

Six, SOC abnormal

1, inaccurate;

Nominal capacity rechargeable battery present = charge if the SOC "charging" SOC + "SOC" the rest of the actual display value deviation or SOC and OCV corresponding relation estimation based on the actual power don't correspond with the SOC and we believe that the SOC is not accurate.

2, do not change;

The cause of the problem:

Lack of (1) communication exception (data);

(2) the current exception (hall and its input and output circuit);

(3) BMU fault;

(4) other battery alarm.

Methods: (1) to ensure the data integrity;(2) to repair/replace the failure parts;(3) to eliminate all the battery report to thespecial.

3, falling fast;

The cause of the problem:

(1) the communication cycle

(2) the current exception (hall forward current is big, small feedback current);

(3) monomer voltage on the low side, falling fast;

(4) BMU fault;

(5) at low temperature.

Processing method:

1) update the BMU program;

(2) to repair/replace the failure parts;

4, slow down;

The cause of the problem: (1) the communication cycle (2) current anomaly (hall, small forward current feedback current) (3) BMU failure.

Processing method:

1) update the BMU program;

(2) to repair/replace the failure parts.

5, to beat; Make sure application version number is correct

Seven, current exception

The cause of the problem:

1) hall and its input and output circuit;

(2) the hole against loading;

(3) dc charging voltage or current to zero if the BMS demand, the charger in accordance with the minimum output power output.

Processing method:

1) update the BMU program;

(2) to repair/replace the failure parts.

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