Battery repair process and methods

by:Power Kingdom     2021-07-09

  Battery correction process and methods

  1, correction process

   Battery correction generally It can be divided into four steps: selection, judgment, repair, and inspection:

   Selection-is to make a preliminary selection of batteries, select batteries that have no value for correction, and reduce corrections. blindness.

   Judgment-is to check and judge the qualified batteries in the primary selection, and continue to remove the batteries that are difficult to correct; then according to the specific conditions of the battery, select the appropriate correction process for the battery Make corrections.

   Repair-is to select the appropriate correction method and correction process to correct the battery with correction value.

   Inspection-is to measure the battery that has passed the correction, check the correction effect, and provide a basis for the use of the battery.

  2, select the battery reference specification

   The battery correction is mainly for the sulfated battery. Regarding physical damage, such as short circuit, open circuit, electrode plate softening, shape rupture, aging and obsolete batteries cannot be corrected, the initial selection specifications are as follows:    (1) Good appearance, no Swelling, deformation and leakage.

   (2) The battery has been shipped within two years (see the batch number), and the battery used for more than two years has no correction value.

   (3) A battery with a capacity not less than 40% of the extra capacity, and a battery with a capacity lower than 40% of the extra capacity, will be difficult to reach the ideal capacity value after correction.

   (4) The open-circuit terminal voltage is higher than 12V when the battery is not losing power. Use a multimeter to measure the battery voltage. If the voltage appears to be lower than 12V, the battery has broken or short-circuited and cannot be corrected.

   When measuring the open circuit voltage of the battery, the battery should be in a stable condition. After the battery is charged, discharged or filled with distilled water, it should be allowed to stand for half an hour before measuring. The open circuit voltage of the battery can be measured with the voltage file of a multimeter, and the positive and negative test leads of the multimeter can be connected to the positive and negative electrodes of the battery separately.

   Even if the battery has just been discharged, the voltage should be greater than or equal to 11.6V

   (5) Correction with active agent The used battery cannot be corrected. Because all the active agents for battery correction on the market contain carbon components, the original solution of the battery contains impurities, which will form deposits over time, so it cannot be corrected.

  (6) It is possible to measure the internal resistance of the battery conditionally. If the internal resistance of the battery is increased by 100% compared to the new time, then the correction should be discarded.

  3. Check and determine

   (1) Check whether there is water shortage:

   After enough electricity, because the sulfuric acid concentration is higher than before the loss of water, the open circuit voltage is higher; the sealed battery is difficult to measure the sulfuric acid concentration, and the battery voltage reaches 13.4V and should be considered for water loss.

   Electric vehicle batteries generally used for more than 8 months have varying degrees of water shortage.

   (2) Sulfurization discrimination

   If the battery presents the following conditions, it can be considered that the battery is now vulcanized.

   1) The battery capacity drops, and the voltage drops by 0.1V to discharge electricity as long as 0.5Ah at most;

   2) The electrolyte density is lower than the normal value;

   3) The battery terminal voltage is too high when charging and charging are completed; especially when the battery is charged with a current of less than 0.5A, the voltage rises faster and reaches a higher level quickly (>14.4V)

   4) Bubbles occur prematurely during charging or when they start charging (open battery);

   5) The electrolyte temperature rises quickly during charging.

   (3) Discrimination of plate softening

   If black matter floats up from the battery in the open battery, clarify the plate Soften and extract the electrolyte. If the electrolyte is not very dirty, the battery can continue to be used after correction. If the electrolyte is black, it indicates that the plate is severely softened and the battery is difficult to correct.

   There is no bright liquid in the sealed battery, and the battery with the softened plate only needs to be added with water and vibrated to see the dark electrolyte. When the battery is discharged, the voltage is not lower than the normal value, or even High, almost everything is normal before the discharge to 12V, but around 12V, it will suddenly drop rapidly, and the inflection point will be greatly earlier. We can think that a severer plate softening has occurred.

   (4) During battery discharge measurement, if the load voltage drops by 0.1V when the battery starts to discharge, the discharge capacity is lower than 0.4C or the load voltage drops rapidly below 11.8V. Generally, the capacity of a battery is less than 40% of the additional capacity, and such a battery generally has no correction value.

  

  4. Correction process

   A basic correction process for sealed batteries includes start selection, information recording, discharge measurement, To make up for liquid, pulse correction, measurement and discrimination, the correction process of using the pulse method to correct the battery is shown in Figure 2; Hydrotherapy correction.

  

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