Are you an owner of a 2019 e-Golf and curious about your battery’s health? Many e-Golf enthusiasts are turning to OBD2 (On-Board Diagnostics II) tools to delve deeper into their vehicle’s performance, and battery degradation is a key concern for electric vehicle owners. This article explores how data obtained via OBD2, particularly using tools like OBD11 or VCDS, can shed light on the state of your 2019 e-Golf battery.
Understanding OBD2 Data for Battery Health
For those unfamiliar, OBD2 is a standardized system that allows you to access a wealth of data from your car’s computer. Using interfaces like OBD11 or VCDS, you can read various modules, including module 19 which seems to hold valuable battery information in the e-Golf. Initial investigations suggest that readings like “Energy storage unit SOC,” “HV battery Charge State,” “SOH_Q,” and “SOH_P” are crucial indicators of battery health.
The “Energy storage unit SOC” appears to represent the battery’s state of charge in Watt-hours (Wh). Observations indicate this figure accurately reflects real-time energy consumption. The “HV battery Charge State” likely mirrors the percentage displayed on your CarNet app or the dashboard, representing the user-facing state of charge, not the absolute cell state.
Of particular interest are “SOH_Q” and “SOH_P.” These acronyms potentially stand for “State of Health – Quality” and “State of Health – Power,” both expressed as percentages. Early calculations, based on data from 2019 and 2016 e-Golf models, hint that these SOH values might be linked to battery degradation.
Let’s examine the data points from two e-Golf examples to illustrate this:
2019 e-Golf (built December 2018, 2852 miles)
- Energy storage unit SOC: 15475 Wh
- HV battery Charge State: 49.0%
- SOH_Q: 97%
- SOH_P: 97%
Based on these figures, the calculated usable battery capacity today is approximately 31,581 Wh (15475 Wh / 0.49). Extrapolating further, the estimated usable capacity at the factory was around 32,558 Wh (31581 Wh / 0.97).
2016 e-Golf (built August 2016, 26,154 miles)
- Energy storage unit SOC: 15000 Wh
- HV battery Charge State: 80.0%
- SOH_Q: 87%
- SOH_P: 87%
For this older e-Golf, the calculated usable capacity today is 18,750 Wh. The estimated factory usable capacity is around 21,551 Wh (18750 Wh / 0.87).
These initial calculations suggest a correlation between SOH_Q/SOH_P values and battery degradation over time and mileage. The data implies that e-Golf batteries might leave the factory with roughly 90% of their total capacity accessible to the user at a “full charge” indicated on the gauge.
Call to Action: Share Your OBD2 Data!
To further validate these findings and establish a more robust understanding of e-Golf battery health diagnostics using OBD2, we need more data! If you own a 2019 e-Golf, or any e-Golf model and have access to OBD11 or VCDS, please consider sharing your readings. Specifically, the “Energy storage unit SOC,” “HV battery Charge State,” “SOH_Q,” and “SOH_P” values from module 19 would be incredibly helpful.
By pooling data from a larger sample size of vehicles, we can potentially refine these calculations and develop a reliable method for diagnosing e-Golf battery health without relying solely on estimations from the trip computer or dealer assessments. Your contribution could help the e-Golf community gain valuable insights into the long-term health of their EV batteries.
