2.11.78.2, 2018-12-05 18:30:44

Technology.

Every detail counts.

Volkswagen electric mobility represents a mix of innovative technology and superior reliability. Our extensive knowledge and expertise, coupled with our developers’ many years of experience, enable us to decisively shape the mobility of the future. Find out here how Volkswagen electric cars work.

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Energy recovery: the energy source in hybrid and electric vehicles.

Every Volkswagen electric and hybrid vehicle generates its own power. Energy is recovered when the driver brakes, which is returned to the batteries. The technology that makes our vehicles so economical is known as energy recovery, or recuperation. The video shows how this works in detail.

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A view into the internal workings.

What actually differentiates electric vehicles from conventional cars?

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The e-glossary.

What do BEV, energy recovery (recuperation) or well-to-wheel mean? We explain key concepts from the world of electric mobility below.

Electric Car Battery FAQ

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:

  • Wet roads resulting in higher level of tyre slippage 
  • Demisting interior of the car 
  • Greater use of Window wash to clear windscreen
  • Greater use of heating or air conditioning to keep the driver and passenger comfortable
  • Shorter days resulting in greater use of Lights
  • Greater volume of congestion in Winter
  • Using Winter tyres, carrying winter preparation kits.

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:

  • Battery Case and Cover
  • Battery Cell Modules
  • Battery Electronics
  • High Voltage Connector and Cables

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:

  • Temperature
  • Overcharging at High Temperatures
  • Deep discharging
  • High Discharge
  • Charge Current

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:

Positive electrode:

  • The positive electrode in Lithium Ion batteries are generally made from a compound called lithium-cobalt oxide (LiCoO2), lithium iron phosphate (LiFePO4) or lithium manganese oxide (LiMn2O4)

Negative electrode:

  • The negative electrode is generally made from carbon (Graphite)

Electrolyte:

  • The electrolyte varies manufacturer to manufacturer but is only a carrier for the electrons to flow through

Separator material:

  • The separator is to prevent the Positive and Negative cells contacting and causing a dead short. It facilitates the chemical reaction but does not participate. It is generally made of a plastic or ceramic material.

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.

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