BATTERY
id119000000200
Purpose of Adoption
• Not applicable
Service Point
• If the battery charge condition (SOC) is less than 65%, i-stop is prohibited and charges when the SOC is 85% or more (i-stop starts at 65% or more).
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(1) If the vehicle is delivered to the customer in a low battery SOC condition due to dark current consumption while the vehicle was in transport for a long period of time, the SOC will not restore sufficiently depending on how the customers uses the vehicle, i-stop will not operate after delivery, and the fuel economy may continue to worsen.
(2) If the user leaves the vehicle undriven for long periods, the battery SOC will decrease from dark current consumption, and the same conditions may continue.
• An i-stop dedicated battery has been adopted. If a normal battery is installed in an i-stop-equipped vehicle, the system will determine that the battery is deteriorated which could cause early i-stop inhibition.
Common Inquiry
• Not applicable
Other
• If the battery SOC is 55% or less, there may insufficient current supply to start the engine in low ambient temperatures. In particular, the SOC will rapidly decrease while i-stop is operating because electric current is supplied to each electrical device only from the battery.
• If i-stop continues to operate with a low SOC, the SOC will decrease further and the battery condition cannot be restored to its original condition even by charging (if SOC is less than 30%). If it decreases further, dendrite (lead dissolved in battery fluid) occurs and charging the battery under this condition will cause a dendrite short (battery internal short).
• The frequency of repeated charging/discharging with i-stop has increased compared to conventional vehicles. To prevent low battery life from battery depletion by this repeated charging/discharging, the electrode plate specification has been optimized resulting in a battery internal resistance that is lower than a normal battery. By contrast, the internal resistance increases as the battery continues to deteriorate. To detect a battery deterioration condition by this internal resistance, the PCM determines battery deterioration and inhibits i-stop if a normal battery with high internal resistance is installed.