Lithium-ion battery electric vehicle battery repair methods
Lithium-ion batteries for electric vehicles typically consist of at least ten or more lithium-ion batteries connected in series, and include a battery protection board. This is completely different from lead-acid battery packs (which are fewer in number and generally do not have a protection board). If a malfunction occurs, non-technical personnel generally cannot resolve the issue.
1. The lithium-ion battery pack for electric vehicles is 48V 20AH, which can be repaired using a 60V 20AH battery charger;
2. A 48V 12AH lithium-ion battery pack can be repaired by charging it with a 48V 20AH battery charger.
3. Using hot water from dry cleaners to repair lithium-ion batteries: Many electric vehicle users are aware that electric vehicles have short ranges and need to add distilled water to maintain and repair the battery. However, purified water and various supplementary and repair solutions sold on the market have only a temporary effect on the battery, and then accelerate the decline in battery performance, leading to premature failure.
Repairing batteries with an electric vehicle battery charger: The voltage and current of an electric vehicle charger must be matched with the model and specifications of the electric vehicle's lithium-ion battery. Therefore, the charger that comes with the vehicle cannot repair the battery pack; a higher-power electric vehicle charger is required.
How to repair a lead-acid battery?
1. Battery series connection repair method
This method is used when the nominal voltage of a single battery cell is below 12V. For example, commercially available rechargeable emergency lights often use 6V 4Ah batteries. The tester's single-channel output is 12V. In this case, two 6V batteries can be connected to the tester for desulfation repair (Note: Appropriate charging and discharging currents should be selected based on the battery's nominal capacity).
2. Battery parallel current sharing method
If the lead-acid battery voltage rises rapidly during the repair process, the charging and discharging current should be reduced. In this case, the two batteries can be connected in parallel to a single tester circuit, with the charging and discharging current reduced to half of the original; this method also yields good results.
3. Output Combination Method
This method can be used for batteries that have been stored for a long time or have severe self-discharge and sulfation, when water replenishment and charging are not effective enough. This method is more effective for severely sulfated batteries. When using this method, it is best to choose a charging current of 5A. Because of the superposition of repair functions, the negative pulse current is greater than the positive pulse current. Choosing 5A is to compensate for the resulting cancellation of charging current.
4. Output Parallel Current Increase Method
If the battery being repaired has a large capacity, such as exceeding 20Ah, it may be necessary to increase the charging current. In this case, two or more outputs of the tester can be connected in parallel to the battery being repaired simultaneously to enhance the charging current. In actual tests, it was found that, depending on the battery type, when testing with a T1000 digital multimeter in DC 20A range, the current after connecting the two outputs of the tester in parallel to the battery gradually increases to the sum of the two output currents.
5. Parallel desulfurization output method
For lead-acid batteries that are severely sulfated and for which repeated repairs have shown little improvement, a method to enhance desulfation can be used. This involves connecting two parallel testing instruments with their repair functions simultaneously to the battery being repaired. However, this method is not easy to master. The instruments should be connected in phase; otherwise, the desulfation current will weaken. The increase in voltage and current can be used as a criterion for assessment.
