Electric bicycles are becoming more and more popular. Many people are worried about the safety of lead-acid batteries or lithium batteries in electric bicycles?
It is safe according to the standard of lithium ion battery. For example, many lithium ion batteries cannot be punctured. If the needle is punctured, the battery will explode, but lead acid will not have this problem.
This is because the lithium-ion battery is usually filled with combustible electrolyte. To be exact, it is conductive salt and combustible solvent, including carbonate, ether, ester, etc. Once the battery is punctured and the positive and negative poles are directly connected, that is to say, there is a short circuit. Then the battery discharges rapidly, and the solvent will be ignited, which may eventually cause an explosion. The detailed principle is not easy to understand all here. If you want to know the details, you should learn from the battery infrastructure.
Of course, lead-acid battery does not have this problem. Its electrolyte is sulfuric acid, and the specific principle has been learned in high school. Therefore, it makes sense to say that it is safe to prick, but if we really prick the lead-acid battery with a needle, will we think it is safe?
Obviously not, can sulfuric acid leakage be anything safe? Moreover, during normal use, lead-acid batteries will release sulfur gas, and some sulfuric acid will be reduced to sulfur dioxide, which is also toxic. It doesn’t matter on land, but think about it. If these toxic gases can’t be released from underwater ships, what will happen?
Therefore, whether the lead-acid battery is safe is entirely in the context of lithium ion battery, but its safety is not as high as expected.
To take an inappropriate example, we believe that “Yao Ming can play basketball” is true because we default that it is said in the basketball field. But if you ask him to play football, you can see how he answers.
Therefore, safety is not just a dimension. If a lithium ion battery is punctured, it will explode. If a lead-acid battery is punctured, it will be corrosive. These are all unsafe factors, but the explosion will have a greater impact on people’s vision.
Can Li ion batteries be safe?
sure.
The current lithium ion battery usually adds flame retardant to prevent the electrolyte from burning due to short circuit and other reasons, which solves the safety problem to a certain extent.
Of course, there is a more direct way to achieve complete incombustibility and non explosion by using solid electrolyte
Due to the confidentiality requirements of sensitive industries, I can’t show more information, but in fact, this battery has also passed the drop, squeeze and other tests, but it is not the safest one. There is still one that can be used in the oven,now you can see it is safe.
