The automotive industry rapidly developed start-stop engines to reduce carbon emissions and provide more efficient fuel consumption. This innovative system turns off the car’s engine in situations where the vehicle would otherwise idle, such as stopping at traffic lights. Start-stop systems utilize sensors to detect when the vehicle is stationary. Some models will automatically shut off the engine when the vehicle’s speed falls below a specific threshold.

Start-stop systems are available with most vehicle classes, including motorcycles, to improve fuel efficiency and lower engine emissions. While these systems are highly advantageous in numerous ways, they do pose significant challenges for automotive batteries. Repeated starts and stops place a high demand on a vehicle battery because the vehicle is still in use. As the engine switches off, the battery must take on the burden of powering any electrical components that continue running. As a result, start-stop automotive systems often cause charge management and charge acceptance issues with vehicle batteries.

Hollingsworth & Vose (H&V) is a leading supplier of battery separators designed to improve battery function in start-stop systems.

Battery Separators for Automotive Start-Stop Engines

H&V Absorption Glass Mat (AGM) separators have become the dominant choice for automotive Starting, Lighting, Ignition (SLI) batteries used in start-stop vehicles. Our AGM separators facilitate high-speed assembly to meet the complex production demands of the start-stop vehicle market. We specifically design our separators to account for increased service demands such as rapid recharge, cycling, and acid stratification.

Accommodating these demands requires a wettable and porous battery separator that will allow acid to permeate it as the battery is charging or discharging. Additionally, the separator should never impede the flow of ions between the cathode and the anode.

Due to the acidic, oxidative environment of the battery, manufacturers must opt for materials that resist these stressors. Start-stop engine battery separators must also be durable enough to handle assembly operations and function reliably under the intense vibration and thermal stress they will encounter over the battery’s service life.

Additionally, consider the way that the separator will interact with the acid contained within the battery. Since the acid serves as the fuel or reserve capacity for the battery, manufacturers must design the battery separator to displace a minimal amount of acid. Incorporating this design feature will ensure optimal battery performance.

Our battery separators offer numerous benefits for start-stop systems, including:

  • High-rate discharge performance
  • Cycling optimization
  • Compression maintenance (recovery)
  • Electrolyte stratification resistance
  • Reserve capacity optimization
  • High-porosity for maximum electrolyte volume
  • High-vibration resistance
  • Chemical purity and consistency
  • Thickness and basis-weight control
  • Electrolyte-filling efficiency
  • Wrapping/stacking efficiency
  • Assembly defect reduction (rips, splits, tears, and punctures)
  • Paste imperfection protection (paste lumps, spurs, etc.)

All-Glass and EnergyGuard® from H&V

At H&V, we manufacture all of our battery separators at a global network of regionally located mills, enabling us to offer rapid delivery times and localized application support. Our EnergyGuard® high-strength battery separator provides an ideal solution for start-stop systems, featuring an exceptionally robust construction that guards against vibration and assembly defects. Alternatively, our all-glass product line is also popular for this application.

To see how our battery separator solutions can help improve your start-stop system, please contact us today.

  • Resources

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  • Technical Data

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    Automotive Start-Stop

    MD Tensile
    Specific Surface Area
    BG210CB132 210 1.32 3.0 1.4
    BG330CB206 330 2.06 4.5 1.4
    BG410CB257 410 2.57 5.5 1.4
    BG160HB104 160 1.04 6.0 1.8
    BG200HB127 200 1.27 7.5 1.8
    BG300HB192 300 1.92 9.0 1.8

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