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Separator design, formula and construction to maintain electrical performance of the lead acid battery.

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Presentation on theme: "Separator design, formula and construction to maintain electrical performance of the lead acid battery."— Presentation transcript:

1 Separator design, formula and construction to maintain electrical performance of the lead acid battery

2

3 Source: Nielsen Media Index & TGI Survey

4 Sources: US Census Bureau and Times Atlas of the World, tenth edition

5 Source: www.weatherbase.com

6 Rubber Separators PE Separators

7 Water Loss Test 21 Days Overcharge 2.4 V/Cell at 40 °C Positive PbSb 1.6 % / Negative PbCa – 2 Shot Formation Water Loss [g/Ah] PE Separator Daramic HP+ + 40% Improvement

8 Water Loss 21 Days Overcharge 2.4 V/Cell at 40 °C Positive PbCa / Negative PbCa – 2 Shot Formation Water Loss [g/Ah] PE Separator DARAMIC HP+ 25% Improvement

9 Antimony Released from Positive Grid Antimony Poisons Negative Electrode Negative Electrode Depolarizes Higher Recharge Currents Increased Heat and Gassing Results in Loss of Capacity and Battery Failure

10 Rubber

11 PVC

12 Rubber Standard PE PVC

13 Rubber Daramic HD Standard PE PVC

14 Oxidation Resistance Increase Separator Back-web Thickness  Increase Mass, Electrical Resistance and Acid Displacement Laminate Glassmat to Separator  Prevents Shedding, Adds Component Formulation Changes  Polymer and Anti-Oxidant

15 Oxidation Resistance Test – Perox 80 1)Measure Separator Mechanical Properties a) Elongation, Puncture Resistance 2)Soak Separator in Oxidizing Solution a) Hydrogen Peroxide / Sulfuric Acid b) Elevated Temperature 80 degree C 3)Measure Remaining Separator Properties a) After Soaking various times (e.g. 20, 40, … hours) 4)Determine Rate of Oxidation with Drop in Mechanical Properties

16 Daramic HP End of Life < 100%

17 Daramic HP Daramic HP + 25% Longer

18 Standard PE Separator

19 PE Separator with additive Additive Level

20 Asian Market Summary SLI, Stationary and Motive Power Batteries High Population Densities Elevated Ambient Temperature Use of Antimony Alloy

21 Elevated Temp & Antimony Alloy SLI Application  Water Loss => Battery Dry-Out  Rubber Additive to PE Separator  Daramic HP+ Motive Power and Deep Cycle Application  Negative Electrode Poisoning  Loss of Capacity  Rubber Additive to PE Separator  Daramic HD Oxidation Resistance  Rubber increases protection ~ 25%

22 CharacteristicUnitsDaramic HPDaramic HP+ (1) Profile UI Rubber Additive NoYes Back-web Thicknessmicrons200 Puncture ResistanceN13.313.0 Electrical Resistancemohms-cm248.150.0 Porosity%59.958.5 Acid Wet-outseconds9.415.6 Residual Oilwt % Back-web 10.4 Total 16.216.5 CMD Elongation%368414 Oxidation Resistance PEROX CMD Elongation 20 hours 274360 CMD Elongation 40 hours 112214 Acid Shrinkage%0.440.31 SLI Application (1) US Patent 5,221,587 W. Boehnstedt et.al

23 CharacteristicUnitsDaramic CLDaramic HD (1) Profile BC Rubber Additive NoYes Back-web Thicknessmicrons500 Electrical Resistancemohms-cm2265210 Porosity%57.454.3 Ash Contentwt %69.372.8 Residual Oilwt % Back-web 14.815.1 Total 20.420.5 CMD Elongation%256339 Oxidation Resistance PEROX CMD Elongation 20 hours 132226 Acid Shrinkage%1.31.2 (1) US Patent 5,221,587 W. Boehnstedt et.al Deep Cycle Application

24 Taipei 101

25 End


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