There are generally tips on electronic products that use dry batteries. When not using the appliance for a long time, please remove the battery. The usual explanation is: the dry battery is a chemical battery. When the battery is running low, sometimes some electrolyte will flow out inside the battery. These electrolytes will corrode the battery rack of the appliance, and even flow to the circuit board to further corrode the circuit and cause damage to the appliance. When the appliance is not used for a long time, the user does not know that there is an outflow.
The problem is that in daily life, many battery leaks do not occur when the battery is running low, or when the battery exceeds the shelf life. A fully charged battery suddenly leaks. The electrolyte leaking sometimes causes complete damage to the appliance. If the electrolyte comes into contact with the skin without rapid cleaning, it may also cause chemical burns to the skin, which can occur without any precautions.
This article takes alkaline batteries as an example: The dry batteries we buy at the store are usually alkaline dry batteries, using manganese dioxide as the positive electrode, zinc as the negative electrode, and potassium hydroxide as the electrolyte. The chemical formula is: Zn+MnO2+H2O→Mn(OH)2+ZnO. It can be seen that a large amount of KOH and a small amount of Mn(OH) 2 dissolved in the electrolyte exist in the electrolyte of the battery.
KOH: It is extremely alkaline and corrosive, and its properties are similar to caustic soda. Has a burning effect on the tissue. The solution splashes on the skin, especially the mucous membranes, which can produce soft palate. Splashing into the eye can not only damage the cornea, but also damage the deep tissue of the eye. Strong irritation of the respiratory tract after inhalation may cause burns. Direct contact between the skin and the eye can cause burns; oral administration can burn the digestive tract and can cause death.
It can be seen that the danger of battery leakage is not only corrosive to electrical appliances, but also hurts people. So why do alkaline batteries leak frequently now, and how to prevent them? In order to make full use of the electrode material, the alkaline electrolyte is rich in liquid, that is, there is a large amount of electrolyte, and both are sealed at the bottom side. As a disposable battery, in order to save costs, the seal is made worse than a normal rechargeable battery. In normal use, as long as the internal pressure increases, it will inevitably leak. Leakage is a property that alkaline batteries are difficult to guarantee, which means that all alkaline batteries are likely to leak.
Since the alkaline battery leakage is so serious, how can manufacturers not improve? The answer is simple, because alkaline batteries are no longer needed for promotion.
How to prevent alkaline battery leakage?
No way to prevent it!
Consider using a general rechargeable battery, such as nickel-metal hydride, nickel-cadmium, and lithium battery. Considering multiple uses, the internal electrolyte is a lean liquid design, and the seal is better and less likely to leak. Or a disposable lithium battery is also a better choice.