With the advancement of new energy electric vehicles, the security issues of electric vehicles are getting expanding consideration. Among them, the wellbeing attributes of lithium batteries are one of the critical variables for the security of electric vehicles. This article takes ternary delicate pack lithium batteries as the examination object, and through trial and reenactment research, investigates the security attributes of lithium batteries under various states of pulverize heads, different smash positions, and different beginning condition of charge (SOC) conditions.
The exploration results show that the more honed and smaller the state of the squash head, the prior the unexpected temperature increase season of the lithium battery, the more noteworthy the abrupt temperature misfortune, and the higher the interior opposition rise. The nearer the crushing position is to the base edge of the lithium battery, the more probable the temperature climb is to cause warm out of control. The nearer the pressing position is to the shaft ear, the more prominent the limit misfortune and inner opposition esteem. Likewise, the higher the SOC of lithium batteries, the more probable they are to encounter warm out of control, more prominent voltage drop, more noteworthy limit misfortune, and more noteworthy inner opposition.
To acquire a more profound comprehension of the wellbeing qualities of lithium batteries under various circumstances, this article likewise settled warm and stretch reproduction models for lithium batteries in view of the COMSOL programming stage, and directed recreations of temperature and stress changes of lithium batteries under different smash conditions. The reenactment results show that the temperature and distortion examples of lithium batteries after squash are in great concurrence with genuine smash tests.
1 Working guideline
At the point when a lithium battery is released, electrons stream from the negative terminal to the positive cathode through an outer circuit, while lithium particles move from the negative anode to the positive cathode. During this interaction, lithium particles are moved through the electrolyte and pass through the separator to arrive at the positive anode. This interaction is known as the lithium evacuation response.
At the point when a lithium battery is charged, electrons stream from the positive cathode to the negative terminal through an outside circuit, while lithium particles move from the positive cathode to the negative cathode. During this cycle, lithium particles are moved through the electrolyte and pass through the separator to arrive at the negative anode. This interaction is called lithium intercalation response.
The warm out of control of lithium batteries alludes to the peculiarity of overheating, start, and blast brought about by the fast change in the pace of self temperature climb of the battery brought about by the chain response of single cell heat discharge. This peculiarity might be brought about by interior shortcircuits, cheating, pressing, high temperatures, and different reasons in the battery. At the point when the temperature of the battery increments partially, the interior substance response pace of the battery speeds up, creating a lot of intensity energy, prompting a quick expansion in battery temperature and eventually prompting warm out of control of the battery. During this cycle, the electrolyte inside the battery will deteriorate, the positive and negative terminal materials will consume, and the battery will burst into flames or detonate.
Hence, while utilizing lithium batteries, it is important to focus on wellbeing issues and keep away from unfriendly tasks, for example, cheating, releasing, pressing, and high temperature to guarantee the security and steadiness of the battery. Simultaneously, during use, the state of the battery ought to be consistently checked, and issues ought to be recognized and managed on time to keep away from security mishaps.
