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There are a number of points that can feed into this topic, but the main one is the impact of temperature on the performance of the battery. It is generally considered that the operating temperature of the battery to get the maximum potential from the power storage (reaction) would be ~4C (40F) to ~21 (70F)
Other elements would be:
On the electric vehicle the battery is the fuel tank and is required to store the energy for the vehicle, so it is substantial in size. On the Volkswagen e-Golf the battery is nearly 350Kg and is incorporated into the structure of the vehicle.
The High Voltage Battery is an assembly made of several different components including:
The battery can be removed from the car, individual cells or modules exchanged and brought back to operating service in a reasonable timeline.
How can I ensure the battery life is maximized?
There are some considerations to ensuring the life of the battery cells is maximised. The following are considered a challenge to the battery life:
The general rule of thumb is to have 4 Normal charge cycles for every 1 Fast Charge cycle.
A battery is comprised of 4 general components, and the Lithium component is within the positive electrode. The 4 general components comprise of:
Replacing the complete battery is not foreseen as a typical service activity.
The battery comprises the case, cover, control electronics, internal High voltage wiring and battery cells grouped as modules.
The Volkswagen repair concept for High Voltage batteries is to facilitate module replacement over battery replacement. With this you are essentially only replacing the component that is necessary and is a lower cost alternative. This approach is akin to replacing a timing belt or cylinder head on an engine rather than the complete engine and associated control units. The Volkswagen e-Golf battery comprises of 27 Module units.
The warranty of that the Volkswagen e-Golf High Voltage battery will be free from defects of materials and workmanship and maintain spare 70% capacity for 8 years (or 160,000kms) whichever comes first.
Gradual reduction in battery capacity over time is integral to the nature of the component and does not represent a defect under the terms of this warranty, as long as the reduction in capacity is not in excess of the value specified for this vehicle in the owner's manual.
The warranty on high voltage batteries does not apply if the defect has been caused by the battery not being used, handled or maintained as described in the owner's manual. This applies in particular to charging the battery.
With the exception of the warranty term, all warranty conditions stipulated by the Volkswagen Retailer selling the vehicle (pre-requisites, criteria for freedom from defects, exclusions, settlement of claims, entry into force and start of extended warranty term, scope of application etc.) also apply to the high voltage battery.
In the case where a rectification is required on the High Voltage battery, the battery may be repaired or replaced depending on the causing defect issue.
The Disposal cost of the battery is not borne by the consumer through normal vehicle use. Volkswagen Group Ireland have planned an environmentally sound takeback process at the vehicles End of Life and this is not charged to the customer.
There is no cost to the customer regarding the disposal of the High Voltage battery in the Volkswagen e-Golf.