As long as the battery is not short-circuited, it will not explode if it does not heat up. Therefore, when the battery is assembled, it must have over-temperature protection and over-current protection. Only then, the battery will be safe. If you only consider thickening the outer casing, it is equivalent to increasing the explosion. The power is even more dangerous. The thicker the box, the more powerful the explosion, so the key is to improve the over-current and over-temperature protection of the battery. It is safer to use a high-quality protection board.