What are the methods for judging battery electrodes?

According to the characteristics of battery electrode design, the commonly used storage batteries are processed and designed. The thicker end of the battery post is the positive electrode. The other end is thinner as the negative electrode. At the same time, the color of the battery post can be identified. The positive electrode The post is dark brown, and the negative electrode is dark gray. In addition, the positive and negative marks of some batteries are represented by English letters, that is, p is the positive electrode, and N is the negative electrode. This must not be mistaken when checking and charging. Using the multimeter to measure the voltage stop, the multimeter can be set to the DC position, and the two meter pens are connected across the two electrodes of the battery. At this time, if the battery shows a normal voltage value, it proves that the electrode touched by the red meter pen is the positive electrode of the battery. The black test lead is the negative electrode. Sometimes it is measured that the battery does not have a normal voltage, then the weak storage capacity of the battery can be measured to judge. When the two test leads touch the battery electrodes, if the test needles move slightly to the right, it proves that the red pen is the battery positive electrode and the black test pen is the negative electrode. But if the pointer of the multimeter moves to the left (the needle hits back), it proves that the negative electrode of the battery is touched by the red pen. Use short-circuit wires to identify the two copper core power cords across the electrodes of the old battery to be tested, and then pour the normally configured electrolyte (concentrated brine) into a glass tea cup, and separate the two ends of the power cord. Insert the teacup into the teacup and place them on both sides of the glass (the two wires cannot touch each other in the cup), and then observe the bubbling situation of the respective lead ends in the electrolyte. If there is a small air bubble on the end of a wire When the bubbles are obvious and there are more, it means that the end of the power cord connected to the battery is the negative electrode, and the end with fewer and less obvious bubbles is the positive electrode of the battery. Use the rectifier diode to determine the unidirectional conductivity of the rectifier diode in the power regulator. You can find a rectifier diode, a 40w incandescent lamp, and then press a pile of the battery in turn → diode + end → diode-end → incandescent lamp → The other piles of the battery are connected in series to form a series circuit of electric lamps. At this time, if the incandescent lamp in the circuit is ignited to emit light, it is proved that the connection between the diode end and the battery pile is the positive electrode of the battery, and the other end is the negative of the battery. electrode. 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 article: What are the characteristics of aluminum-air batteries?