Analysis of Power Lithium Ion Battery Seven Common Faults and Solutions

　　Author ：Iflowpower – Portable Power Station Supplier

1. The battery voltage is high: after the full power is standing, the battery is single or several string voltage is highly high, and the other monomer is normal. Fault original: 1 collection error; 2LMU balance function difference or failure; 3 battery capacity is low, the voltage rises faster when charging.

Workaround: 1 The monomer voltage display value is higher than the remaining monomer, the actual voltage value of the monomer is compared. If the actual value is lower than the display value, and the actual value is standard to LMU with the actual value of the actual value. The monomer voltage is calibrated; if the measured value is consistent with the display value, the artificial battery is discharged.

2 Check the voltage sampling line is not broken, false; 3 replacement LMU. 2, battery voltage is low: After the full power is standing, the battery is single or several monomer voltage is low, and other monomers are normal. Failure Original: 1 collection error; 2LMU balance function difference or failure; 3 battery self-discharge rate; low battery capacity, voltage drop in voltage is faster.

Solution: 1 The monomer voltage display value is lower than that of the remaining monomer, and the actual voltage value of the monomer is compared. If the actual value is higher than the display value, the actual value is standard to LMU with the actual value of the actual value. The monomer voltage is calibrated; if the measured value is consistent with the display value, the manual charging balance is charged.

2 Check the voltage sampling line is not broken, false; 3 replacement LMU; 4 to replace the faulty battery. 3, differential pressure: dynamic differential pressure / static pressure difference. When charging, the monomer voltage is quickly cut off voltage skip; when stepping on the throttle, the monomer voltage is fell quickly than other strings; when the brake is turned on, the monomer voltage rapidly increases than other strings.

Fault Original: 1 Connecting Battery Copper Tightening Hyper; 2 Connecting Face Delivery; 3 The electrical core self-discharge rate is large; 4 electrical wire welding connection bronze medal soldering (resulting in a single single capacity); 5 individual monomers Core leakage. Solution: 1 Tighten the nut; 2 Clear the connecting surface foreign body; 3 to charge / discharge equilibrium of the single battery; 4 to change the problem battery pack. 4.

Voltage hop: When the vehicle is running or charging, the monomer voltage jump. Failure Original: 1 voltage collection line connection point loose; 2Lum fault. Solution: 1 Tighten the connection point; 2 replace the LMU.

Temperature class failure 1, thermal management fault; 1 heating fault (heating piece); when the temperature is below a value, when charging, heating does not open. Fault original: 1 heating relay or BMU failure; 2 heating sheet or relay power supply circuit is abnormal. Solution: 1 Repair or replace the heating relay or BMU; 2 Check the power supply circuit.

2 heat dissipation failure (fan); after the temperature is above a certain value, the fan does not work. Failure Original: 1 fan relay or BMU fault; 2 fan or relay power supply circuit is abnormal. Solution: 1 Repair or replace the fan relay or BMU failure; 2 Check the power supply circuit is abnormal.

2, high temperature: a alarm threshold in a certain temperature point in the battery system, running or charging. Fault original: 1 temperature sensor failure; 2LMU fault; 3 electrical connection abnormal local fever; 4 fan is not opened, heat dissipation; 5 close to the motor; 6 over charge. Workaround: 1 Measurement Temperature Sensor resistance value is compared with the display value.

If the actual value is lower than the display value, the LMU temperature value is calibrated with the actual value of the actual value; 2 fastening electrical connection point Clear connection point foreign object; 3 ensuring the fan open; 4 new increased heat materials are isolated from the heat source; 5 suspend operations for heat dissipation; 6 immediately stop charging; 7 Replace LMU. 3, low temperature: a alarm threshold in a certain or a few temperature points in the battery system, running or charging. Failure Original: 1 temperature sensor fault; 2LMU fault; 3 local heating sheet abnormal.

Workaround: 1 Measurement Temperature Sensor resistance value is compared with the display value. If the actual value is higher than the display value, the LMU temperature value is calibrated with the actual value of the standard; 2 Check the repair heating sheet; 3 replacement LMU. 4, temperature difference; refer to high and low temperature test method.

Codification. Charging failure 1, DC charging failure; GB / T27930-2015 charging can not start, charging jumper, SOC does not reset after charging. Failure Original: 1 Battery Fault (voltage, temperature, insulation, etc.

) 2BMU fault (charging module or charging CAN abnormal) 3 main negative, charging relay abnormal 4cc1 pair resistance, CC2 pairs of ground voltage abnormal 5PE field abnormal solutions: 1 exclude Battery Fault 2 Repair / Replacement Failure Component 3 Tread Admission Report, Decomposition Failure Original. 2, AC charging failure; failure original: 1 battery fault (voltage, temperature, insulation and other abnormal) 2BMU fault (charging module or charging CAN abnormal) 3 main negative, charging relay abnormally 4cc pair resistance, CP pair's voltage abnormal 5PE Abnormal Solution: 1 Exclude battery failure 2 Repair / replace the failure part 3 cut charge report, decomposition failure. Insulation fault failure Originally: battery box or plug-in water, battery core leakage, large humidity, insulation, other high pressure parts (controller, compressor, etc.

) insulation. Solution: 1 Positive pair, if there is a voltage or insulated resistance value of less than a specified value, the negative electrode circuit is leaked; the negative electrode pair, if there is a voltage or insulated resistance, the positive circuit leakage is determined. According to the single voltage value of the leakage voltage, the leakage point is calculated, and then the decomposition is solved according to different situations.

Communication fault LUM communication fault, BMU communication fault; the whole vehicle is 1 or several LMU information, or the whole car does not have BMS information. Failure origin: 1LMU / BMU fault; 2LMU / BMU power supply circuit or communication line contact / fault; 3 signal interference. Solution: 1 Replace the LMU / BMU; 2 Check the power supply circuit / communication line; 3 check the shielding line, find the elimination of interference.

SOC abnormal charging capacity & pide; Nominal capacity = Removable SOC If the rechargeable SOC + remaining SOC more actual display value is deviation or the corresponding relationship between SOC and OCV estimates actual power and SOC, we believe that SOC is inaccurate. 2 Disorder failure original: 1 communication abnormality (data missing); 2 current abnormal (Hall and its input output circuit); 3BMU fault; 4 other battery alarms. Workaround: 1 Make sure the data is complete; 2 repair / replace the failure part; 3 eliminate all battery alarms.

3 Dropping failure Original: 1 communication cycle abnormal 2 current abnormal (Hall forward current is large, the feedback current is small); 3 monomer voltage is low, fast; 4BMU fault; 5 low temperature. Solution: 1 Update the BMU program; 2 Repair / replace the failure part; 4 slow failure original: 1 communication cycle abnormal 2 current abnormal (Hall forward current small, feedback current large) 3BMU failure. Workaround: 1 Update BMU program; 2 Repair / Replace the failure part.

5 Dort confirmation program version number is correct.