Does the charging station slow down in summer? How to distinguish whether it is overheating of the main control board or BMS limitation of the battery?

Summer charging pile speed reduction, distinguish between main control board overheating or BMS restriction, three-step positioning:

Check CP signal

• PWM duty cycle actively reduced → main control board overheating limit

• PWM duty cycle remains unchanged but current drops → BMS or OBC limit

Check temperature correlation

• The ambient temperature is above 35 ℃, the chassis is hot to the touch, it drops at noon and recovers at night → the main control board is overheated

• Battery temperature>45 ℃, SOC>80% decrease, unrelated to temperature → BMS restriction

Conduct cross experiments

• Night low temperature retest with the same vehicle and pile: full speed without slowing down → main control board overheating during the day; Still experiencing high SOC deceleration → BMS characteristics

• Replace the shade pile or air conditioning pile: do not slow down at full speed → original pile heat dissipation problem; Still decreasing → Vehicle issues

• Vehicles with normal battery temperature: do not decrease at full speed → limit by the original vehicle BMS; Still decreasing → Charging station issue

Common misjudgments

• Battery aging, high temperature without cooling, charging after long-term parking, BMS conservatively reduces power, mistakenly blaming charging piles

• Fan stopped running, filter clogged, contact oxidized, main control board reduced flow, mistakenly attributed to battery degradation

• High temperature at noon+just finished a long journey, the two overlap and need to be investigated separately

in a word:

The change in CP duty cycle is due to the fear of heat in the pile, while the constant change is due to the fear of scalding in the car. Cross testing should be conducted to determine responsibility and prescribe the right medicine to cure speed reduction in summer.

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