The power battery is the power source that provides the power source for the tool. It refers to the battery that powers the electric car, the electric train, the electric bicycle, and the golf cart. The main difference is the starting battery used for starting the car engine. Valve-sealed lead-acid batteries, open-tube lead-acid batteries, and lithium iron phosphate batteries are often used.
Explain the seven common faults and treatment methods of power batteries
First, the voltage class failure
1. The battery voltage is high: after the battery is fully charged, the single or several strings of the battery are obviously high, and the other monomers are normal.
The cause of the fault: 1 acquisition error; 2LMU equalization function is poor or invalid; 3 cell capacity is low, the voltage rises faster when charging.
Treatment method: 1 The voltage value of the single cell is higher than the other monomers, and the actual voltage value of the single cell is measured for comparison. If the actual value is lower than the displayed value and is the same as the voltage of other cells, the actual value is the standard for the LMU. The cell voltage is calibrated; if the measured value matches the displayed value, the cell is manually discharged and equalized. 2 Check whether the voltage sampling line is broken or not, and replace the LMU.
2, the battery voltage is low: after the full power is static, the battery voltage of a single or a few cells is obviously low, and the other monomers are normal.
Fault reason: 1 acquisition error; 2LMU equalization function is poor or invalid; 3 cell self-discharge rate is large; 4 cell capacity is low, voltage drops faster during discharge.
Treatment method: 1 The voltage display value of the monomer is lower than that of the other monomers, and the actual voltage value of the single cell is measured for comparison. If the actual value is higher than the display value and is the same as the voltage of other cells, the actual value is the standard for the LMU. The cell voltage is calibrated; if the measured value matches the displayed value, the cell is manually charged and equalized. 2 Check whether the voltage sampling line is broken, virtual connection; 3 replace the LMU; 4 replace the faulty battery pack.
3, pressure difference: dynamic pressure difference / static pressure difference. When charging, the cell voltage quickly jumps to the full-power cut-off voltage; when the throttle is stepped, the cell voltage drops rapidly compared with other strings; when the brake is applied, the cell voltage rises faster than other strings.
Fault reason: 1 connection battery bronze fastening nut loose; 2 connection surface is dirty; 3 battery core self-discharge rate; 4 battery core connection copper plate open welding (causing the string monomer capacity is low); 5 individual cells The core leaks.
Treatment method: 1 tighten the nut; 2 remove the foreign matter on the connection surface; 3 charge/discharge the single-string battery; 4 replace the problem battery pack.
4. Voltage jump: When the vehicle is running or charging, the cell voltage jumps.
Fault reason: 1 voltage collection line connection point is loose; 2LUM fault.
Treatment method: 1 fasten the connection point; 2 replace the LMU.
Second, the temperature class failure
1. Thermal management failure;
1 heating failure (heating sheet); when the temperature is lower than a certain value, heating does not turn on during charging.
Fault reason: 1 heating relay or BMU fault; 2 heater chip or relay power supply circuit is abnormal.
Treatment method: 1 repair or replace the heating relay or BMU; 2 check and repair the power supply circuit.
2 Thermal fault (fan); after the temperature is higher than a certain value, the fan is not working.
Fault reason: 1 fan relay or BMU fault; 2 fan or relay power supply circuit is abnormal.
Treatment method: 1 repair or replace the fan relay or BMU failure; 2 check to repair the power supply circuit is abnormal.
2. High temperature: one or some temperature points in the battery system are high, and the alarm threshold is reached during operation or charging.
Fault reason: 1 temperature sensor failure; 2LMU fault; 3 electrical connection abnormal local heat; 4 fan is not turned on, heat dissipation is poor; 5 is close to the heat source such as motor; 6 overcharge.
Treatment method: 1 Measure the temperature sensor resistance value and display the value. If the actual value is lower than the displayed value and the same as other temperature values, the LMU temperature value is calibrated according to the actual value; 2 tightening the electrical connection point Clear the connection point foreign matter; 3 ensure that the fan is turned on; 4 increase the insulation material to isolate from the heat source; 5 suspend operation for heat dissipation; 6 immediately stop charging; 7 replace the LMU.
3. Low temperature: One or a few temperature points in the battery system are low, and the alarm threshold is reached during operation or charging.
The cause of the failure: 1 temperature sensor failure; 2LMU failure; 3 local heating sheet abnormal.
Treatment method: 1 Measure the resistance value of the temperature sensor and compare it with the displayed value. If the actual value is higher than the displayed value and is the same as other temperature values, the LMU temperature value is calibrated according to the actual value; 2 Check the repair heating piece; 3 Replace the LMU.
4, temperature difference; refer to high and low temperature troubleshooting methods. The difference in battery heating.
Third, charging failure
1, DC charging failure; GB/T27930-2015 charging can not start, charging jump gun, SOC does not reset after charging.
cause of issue:
1 battery failure (voltage, temperature, insulation, etc.)
2BMU failure (charging module or charging CAN abnormal)
3 main negative, charging relay is abnormal
4CC1 ground resistance, CC2 ground voltage abnormality
5PE abnormal
Approach:
1 Troubleshooting battery
2 repair / replacement of failed parts
3 Intercept the charging message to analyze the cause of the failure.
2. AC charging failure;
cause of issue:
1 battery failure (voltage, temperature, insulation, etc.)
2BMU failure (charging module or charging CAN abnormal)
3 main negative, charging relay is abnormal
4CC earth resistance, CP to ground voltage abnormality
5PE abnormal
Approach:
1 Troubleshooting battery
2 repair / replacement of failed parts
3 Intercept the charging message to analyze the cause of the failure.
Fourth, insulation failure
The cause of the malfunction: the battery box or the plug-in enters the water, the battery core leaks, the environment humidity is high, the insulation is falsely reported, and other high-voltage components (controllers, compressors, etc.) of the vehicle are insulated.
Treatment method: 1 positive pole to ground, if there is voltage or insulation resistance value is less than the specified value, the negative circuit leakage is judged; if the negative pole is grounded, if the voltage or insulation resistance value is less than the specified value, the positive circuit is leaked. According to the magnitude of the leakage voltage divided by the single string voltage value at this time, the leakage point can be calculated, and then analyzed according to different situations.
Five, communication failure
LUM communication failure, BMU communication failure; the whole vehicle is one or several LMU information, or the vehicle does not have BMS information.
Fault reason: 1LMU/BMU fault; 2LMU/BMU power supply circuit or communication line contact bad/fault; 3 signal interference.
Treatment method: 1 Replace the LMU/BMU; 2 Check and repair the power supply circuit/communication line; 3 Check the shielded line to find the source of interference elimination.
Sixth, SOC anomaly
1. Inaccurate;
Charging power ÷ nominal capacity = SOC of charging If the "SOC of charging" + "residual SOC" deviates from the actual display value or according to the correspondence between SOC and OCV, it is estimated that the actual power does not correspond to the SOC, we believe that the SOC is not accurate.
2, no change;
Fault reason: 1 communication abnormality (data missing); 2 current abnormality (Hall and its input and output circuit); 3BMU fault; 4 other battery alarm.
Treatment: 1 to ensure data integrity; 2 repair / replace failed parts; 3 eliminate all battery alarms.
3, the decline is fast;
Fault reason: 1 communication cycle abnormality 2 current abnormality (Hall forward current is large, feedback current is small); 3 cell voltage is low, fast decline; 4BMU fault; 5 low temperature.
Processing method: 1 update the BMU program; 2 repair/replace the failed component;
4, slow down;
Fault reason: 1 communication cycle abnormality 2 current abnormality (Hall forward current is small, feedback current is large) 3BMU fault.
Processing method: 1 update the BMU program; 2 repair/replace the failed component.
5, beating; confirm that the program version number is correct
Seven, the current is abnormal
Fault reason: 1 Hall and its input and output circuit; 2 Hall reverse loading; 3 If the BMS demand voltage or current is 0 during DC charging, the charger outputs according to the minimum output capability.
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