What is the relationship between the positive and negative electrodes of lead-acid batteries

The positive and negative poles in the battery are opposed to each other, but they participate in the chemical reaction together. During discharging, the battery is connected to the load of the external circuit, and electrons flow from the negative plate to the positive plate through the load of the external circuit, so that the potential of the positive plate is reduced. When charging, it is the reverse process of the discharge reaction. When charging, the positive and negative poles of the battery are connected to the DC power supply. When the power supply voltage is higher than the electromotive force E of the battery, current flows in from the positive electrode of the battery and flows out from the negative electrode of the battery, that is, electrons flow from the positive plate to the negative plate through the external circuit. Before the negative electrode of the battery is discharged, the surface of the electrode is negatively charged, and the nearby solution is positively charged, and the two are in a balanced state. When discharging, electrons are immediately released to the external circuit. The negative charge on the electrode surface decreases, and the oxidation reaction of metal dissolution progresses slowly Me-e→Me+, which can not supplement the decrease of electrons on the electrode surface in time, and the charged state of the electrode surface changes. This state of reduced negative charge on the surface promotes the electrons in the metal to leave the electrode, and the metal ion Me+ transfers into the solution, accelerating the Me-e→Me+ reaction. There is always a moment when a new dynamic balance is reached. But compared with before discharge, the number of negative charges on the electrode surface is reduced, and the corresponding electrode potential becomes positive. That is, the electrochemical polarization voltage becomes higher, which seriously hinders the normal charging current. In the same way, when the positive electrode of the battery is discharged, the number of positive charges on the surface of the electrode decreases, and the electrode potential becomes negative. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: How to distinguish between iron-lithium batteries and lead-acid batteries?