How to repair when lithium-ion battery has voltage and but no current

In generally, there are 3 scenarios when lithium-ion battery is thanatoid.

First of all, battery is not chargeable, chargers, electrical appliances are unable to identify, electrode is without voltage.

In the second, it is rechargeable, chargers, electrical appliances can identify, but only in a few minutes, power run out quickly.

Third, rechargeable, and capacity are adequate, but discharging in large current, voltage drops significantly (specific performance such as: it insists on the camera's shooting mode only in a few minutes, and it lasts for a long time when use back to see patterns)

How to repair when lithium-ion battery has voltage and but no current

1, the battery seems to be "dead", but also has a great probability can save. I summed up the method is: use design is equal to the battery voltage of direct current to the battery.

2, this kind of "death" to the battery, with original charger is not filling into electricity (no current through), but the use of design is equal to the battery voltage of direct current for the battery will be found to have larger electric current, and the charging current will be reduced slowly, after a few minutes close to zero, this is a good news: the battery voltage is restored to the design level.

Then stop charging, then use a multimeter measuring battery at the poles, have normal voltage

3, then, you can use the original charger to charge.

4, in this way, I repair a lot of batteries, and many of them can resume to half design capacity level.

Lithium-ion batteries have voltage and current how repair

5, in order to completely activate cell, also need to charge and discharge completely several times. Discharge circuit with resistance and light-emitting diodes (leds), can pass the leds to estimate discharge state.

6, in my experience, this kind of method for the first battery, very effective. Behind the two batteries, it is hard to repair, to find information on the Internet, also there are few obvious effects. Especially the third "can charge, and capacity is enough, but large current discharge voltage drop clear (such as specific performance: insist on only a few minutes with the camera's shooting mode, and use back to see patterns can insist for a long time)" this kind of battery, discard a pity.

The common faults of 12 v lithium-ion battery and its maintenance methods

Summarize the 12-v lithium battery 7 kinds of common faults in use process, the causes of failure are analyzed in detail, and combined with the specific circumstances, put forward reasonable Suggestions to solve the fault.

A, faults of voltage

1, 12 v lithium battery voltage high: after full recharge let stand, the battery voltage is definitely too high, other monomers to 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, the 12-v lithium-ion battery 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.

B, the temperature type of fault

1, thermal management failure;

(1) heating failure (heating); The temperature is lower than a certain value, when charging, heating doesn’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.

(3) 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;

(7). Replacement of LMU.

3, low temperature, battery system in a certain or a few low temperature points, 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.

C. 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.

D, 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.

E, 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/BMU poor contact 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.

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