General theory of electromagnetic systems

- Jul 31, 2019-

When designing a battery system, it is necessary to provide two electronic protections for overcharging, overdischarging, and overcurrent. Charge the board after removing it. If the battery will explode, it means poor design. Although the above method provides two protections, since the consumer often buys a non-original charger to charge after the charger is broken, the charger manufacturer often removes the charging controller based on cost considerations to reduce the cost. . As a result, bad money drove out good money, and many inferior chargers appeared on the market. This makes overcharge protection lose the first and most important line of defense. Overcharging is the most important factor in battery explosion. Therefore, inferior chargers can be regarded as the culprit of battery explosions. Of course, not all battery systems use the solution shown above. In some cases, there will also be a charge controller design within the battery pack.


The last line of defense: If the electronic protection measures fail, the last line of defense is provided by the battery. The safety level of the battery cell can be roughly classified according to whether the battery core can be externally short-circuited or overcharged. Because, before the battery explodes, if there are lithium atoms inside the surface of the material, the explosive power will be even greater. Moreover, overcharge protection is often left to the consumer by using a poor quality charger, so the battery's ability to withstand overcharge is more important than the ability to withstand external short circuits. Compared with the safety of the steel core of the aluminum shell, the aluminum shell has a high safety advantage.