During regular charging, many new energy vehicle owners
may have encountered the situation where
the charger automatically stops when it is near full
What is the reason behind this?
Today, let’s understand
the charging principles of new energy vehicles~
01
SOC Around 98% to Ensure Charging Safety
SOC, or State of Charge, refers to the battery’s charge status, also known as remaining power, which represents the ratio of the remaining dischargeable power after the battery has been used for a period of time to its fully charged power, usually expressed as a percentage.
Many owners, to prevent overcharging their vehicles, set their vehicle’s SOC below 100%. When the charging power reaches the preset SOC value, charging will stop. Additionally, most charging operators on the market, considering safety issues, will adjust the SOC threshold at their stations. That is, when the charger detects that the vehicle’s remaining power has reached the set value, it will automatically stop the charging operation.
This leads to what people call the “automatic stop” or “not fully charged” situation, which is a normal phenomenon. This setting is designed to prevent potential battery short circuit issues that may arise from overcharging, especially if the vehicle’s built-in BMS (Battery Management System) fails to automatically interrupt the charging operation, which could lead to fire and unnecessary safety incidents.
02
Can Achieve “Full Charge” Through Slow Charging
Therefore, if the charger stops when the vehicle’s remaining power has reached the preset SOC, it can be considered a normal situation. If the power has not reached the related value but the charger stops, you can reinsert the plug and restart charging. Of course, some charging stations may further lower the SOC setting in high-temperature weather to enhance charging safety. You can consult the station administrator or customer service for specific details and make judgments based on the actual situation.
So, if you want to pursue a 100% full charge? With the vehicle’s SOC set to 100%, you can charge at a fast charging station until reaching the SOC threshold, then switch to a slow charging station for trickle charging, which will achieve a “full charge”. However, it is still recommended to follow the shallow charge and shallow discharge usage pattern, as this is more in line with the normal usage state of lithium batteries.
END
Source: Shijiazhuang Vehicle Management Online
Editor: Liu Qian, Review: Zhang Bo, Supervised: Wang YongAll