How to solve the problem of wasting a lot of water resources in the production process of lead-acid batteries, that is, how to improve the process of electrode plate washing, is a problem that the lead-acid battery industry has been paying attention to and expecting to solve. The traditional negative plate water washing process is to put the formed plate into a water tank filled with water, and manually shake the plate to overflow the acid on the plate. In the process, water and drainage are continuously introduced to ensure that the concentration of acid in the water is small, which is beneficial to the diffusion of acid, and also to avoid oxidation of oxygen between the plates and the air. The positive plate water washing process is in addition to the above-mentioned continuous tap water flow washing, or the plate is placed in a water-filled water tank, the water is circulated by the water pump, and the water is changed for about 15 minutes, and the water is generally washed 8 times until the water in the tank is near neutral. . The principle of water washing of positive and negative plates is to wash the plates to neutral or near neutral by dilution, which requires a large amount of water for the washing of the plates.
Research on the positive plate washing and positive plate passivation has received more and more attention. We also conducted related research on the negative plate washing system, and explored a set of operating procedures, which were popularized and applied.
The direction is electrochemical.
Through the on-site process commissioning, first-time performance test, linear scan, XRD, etc., the pH of the water is tested using pH test paper throughout the test.
1.1.2 Control of the circulating water washing system The automation of the system is high. The monitoring, cleaning, dosing, washing, water recycling and plate washing of the pH sensor of the system are fully automated. After the monitoring cabinet switch is turned "ON", the system automatically cleans it until it stops automatically.
Plate type Plaletype number m / wash pan water plate dripping Washing 9: 64-532 Note: Dp grid is lead bismuth, Dm grid is lead bismuth alloy.
Not bad. The composition of the art film which can effectively prevent the passivation of the plate is reduced with the prolongation of storage time.
Since the plate is formed, sulfuric acid remains inside. If the plate absorbs moisture during storage, it has a liquid environment of H2SO4, which satisfies the conditions for forming the primary battery, and the microbattery reaction starts.
The battery plate automatic washing system can perform a relatively thorough acid removal washing process, which fundamentally reduces the amount of residual sulfuric acid and reduces the possibility of the above microbattery reaction. Therefore, although the dry charge performance of the battery does not decrease significantly as the storage time is extended, this is greatly improved compared with the conventional water washing process.
3 Conclusion The automatic circulation water washing system can be popularized in the production of battery dry charge positive plate. The pH value of water in the water tank is controlled within the range of 5~6 at the end of water washing, and the pH value of the plate drip is controlled within the range of 4~5. This is the same as the pH control of the negative plate water washing. The washing time of the positive plate is generally 35~50min, and the washing time of the negative plate is 30~35min, which can ensure the dry charge performance of the positive and negative plates; the positive plate is washed by automatic circulation, which is the first time compared with the traditional tap water washing. Starting performance and quality have been improved, which is reflected in discharge 5s voltage, 45s voltage and discharge to 8.4V and 6.0V discharge time; positive plate storage for different time (from 1~45d), high rate discharge performance of the installed battery There is no decline, and the 8 times rate discharge results show that the dry charge storage performance is stable, and the 10 times rate discharge performance test has no obvious change rule; for the positive electrode plate made of lead calcium alloy, the alkaline washing test is carried out, the weak alkaline aqueous solution is used. Washing the positive plate does not affect the initial discharge performance of the battery; the linear potential scanning results show that the positive plate after automatic circulation washing, although the storage time of the positive plate is prolonged, the high-resistance components PbO and PbSO4 in the passivation film on the surface of the positive electrode grid , PbO.PbSO did not increase, which is conducive to the maintenance of dry charge performance; X-ray diffraction analysis results show that after automatic cycle water washing Plate, a predetermined time after storage was one of the main surfaces thereof with a positive electrode grid has decreased PbO, PbSO4 and PbOPbSO4 found no other phase, this dry-charged advantageous properties. However, the phase results are not completely consistent with the linear potential scanning, and further verification by other experimental methods is needed.
Yan Xucong and Liang Mingxing have done a lot of work for the experiments in this paper, and thank them for their hard work.
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