Method for repairing positive active material of lead-acid battery
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A positive active material, lead-acid battery technology, applied in the direction of secondary battery repair/maintenance, secondary battery, electrolyte/reactant regeneration, etc., can solve problems such as limited effect, prolong service life, delay softening and falling off process, The effect of reducing the replacement cycle
Active Publication Date: 2022-05-31
ZIBO TORCH ENERGY
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[0008] However, the effects of the above four methods are limited, and none of them can fundamentally solve the problem of the crystallization process of the active substance during the cycle.
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Embodiment 1
[0036] The method of cyclic charging and discharging of D-450 flooded tractor lead-acid battery is as follows:
[0037] Discharge: 112A discharge, discharge 3h.
[0038] Charging: 94A charging for 3 hours, 22A charging for 6 hours;
[0039] The above is one cycle (charge 9 discharge 3 procedures), record the relationship between the discharge capacity and the number of cycles.
[0040] The SEM morphology analysis of the cathode active material before the cycle was obtained. figure 2 .
[0041] After every 49 cycles, 90A discharge was carried out, and the termination voltage was 1.7V. When the time discharge time was 4.5h, the battery was fully charged, and the positive electrode active material at this time was analyzed by SEM. image 3 .
[0042] The method is: charge 45A to 2.4V, then charge 22.5A for more than 10h, and then enter the repair procedure:
[0043] (1) Complete discharge: firstly discharge the above-mentioned lead-acid battery to be repaired with a small c...
Embodiment 2
[0053] Prepare the traditional reference 6-DZM-10 lead-acid battery for electric vehicles, the positive active material does not add tetrabasic lead sulfate, and prepare another set of reference batteries, and add 1.0% tetrabasic lead sulfate crystal to the positive active material The above-mentioned batteries are charged and discharged cyclically together, and the method is as follows:
[0055] Charging: 2A / 14.4V constant current voltage limiting for 6h, 1A charging for 1h;
[0056] The above is one cycle, and the relationship between the discharge capacity and the number of cycles was recorded.
[0057] After 200 cycles, it was found that the capacity of the traditional battery without adding tetrabasic lead sulfate significantly decreased, and at this time, the method was repaired according to the present invention.
[0058] (1) Complete discharge: firstly discharge the above-mentioned lead-acid battery to ...
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Abstract
The invention relates to a method for repairing a positive active material of a lead-acid battery, and belongs to the technical field of lead-acid storage batteries. The method comprises the following steps: (1) carrying out low-current complete discharge on a lead-acid battery to be repaired; (2) taking out the positive pole group, forming a transition battery with the auxiliary pole group, filling sulfuric acid for electrolysis, and charging; (3) taking out the positive electrode group, washing with water, putting into a constant-temperature box, and carrying out slow oxidation treatment; (4) recombining the plate group and the auxiliary plate group into a transition battery, pouring a sodium sulfate solution, standing and then charging; and (5) taking out the positive electrode group, washing with water, drying, combining the dried positive electrode group with the negative electrode group of the primary battery, putting into the original battery jar, and pouring a sulfuric acid electrolyte for charging. The method is scientific and reasonable in design, does not need to add other additives, fundamentally slows down the crystallization process of the positive active material lead dioxide, inhibits softening and falling off and performance reduction of the active material, and obviously prolongs the cycle service life of the lead-acid battery.
Description
technical field [0001] The invention relates to a method for repairing a positive electrode active material of a lead-acid battery, and belongs to the technical field of lead-acid batteries. Background technique [0002] A common failure mode of lead-acid batteries is the softening and shedding of the positive active material, and the main reason for the softening and shedding of the active material is that with the progress of the battery cycle charge and discharge, the form of the positive active material lead dioxide is changed from the amorphous state. There is a transition to crystallization and coralization, whereby the crystallization or coralization of lead dioxide causes the softening and shedding of the active substance. [0003] The current methods to solve this problem mainly focus on the following aspects: [0004] (1) Add tetrabasic lead sulfate (4BS) crystal seeds to the positive electrode to improve the strength of the active material; [0005] (2) The tubu...
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