The Anonymous Widower

Thoughts On Batteries On A Hitachi Regional Battery Train

This article is a repeat of Thoughts On Batteries On A Hitachi Intercity Tri-Mode Battery Train, but for their other train with batteries; the Hitachi Regional Battery Train.

This Hitachi infographic describes a Hitachi Regional Battery Train.

Hitachi are creating the first of these battery trains, by replacing one of the diesel power-packs in a Class 802 train with a battery-pack from Hyperdrive Innovation of Sunderland.

The Class 802 train has the following characteristics.

  • Five cars.
  • Three diesel power-packs, each with a power output of 700 kW.
  • 125 mph top speed on electricity.
  • I believe all intermediate cars are wired for diesel power-packs, so can all intermediate cars have a battery?

In How Much Power Is Needed To Run A Train At 125 Or 100 mph?, I estimated that the trains need the following amounts of energy to keep them at a constant speed.

  • Class 801 train – 125 mph 3.42 kWh per vehicle mile
  • Class 801 train – 100 mph 2.19 kWh per vehicle mile

The figures are my best estimates.

We also know that according to Hitachi, the battery train has a range of 90 kilometres or 56 miles at a speed of 100 mph.

So applying the formula for energy needed gives that the battery size to cover 56 miles at a constant 100 mph will be.

56 * 2.19 * 5 = 613.2 kWh.

In the calculation for the Hitachi Intercity Tri-Mofr Battery Train, I had assumed that a 600 kWh battery was feasible, as it would lay less than the diesel engine it replaced.

I can also apply the formula for a four-car train.

56 * 2.19 * 4 = 490.6 kWh.

That too, would be very feasible.

Conclusion

I can’t wait to ride in one of Hitachi’s two proposed battery-electric trains.

 

June 1, 2021 - Posted by | Transport/Travel | , , ,

2 Comments »

  1. I am concerned about batteries for the following reasons:-

    Current battery life is not much more than 1,000 recharges. How long do the batteries in mobile phones, laptops and battery tools last? only about 3 years. I have about 12 dead batteries which I can not recycle locally. My diesel car is now 22 years old and would have used 7 batteries. I have been following this in the professional publications and on the Internet.

    Batteries use metals in short supply, mostly controlled by China. As I mining engineer I know how long it takes to find deposits, get planning (despite NIMBies), build the mine and start production. 10 to 15 years.

    Recycling batteries has to be sorted out.

    Just think of the number of batteries requires to replace every car in the world and replacements every 3 years, plus grid storage, rail and aeroplanes?

    Comment by Ben | June 2, 2021 | Reply

  2. If there’s one thing that’s puzzling in this battery train project, it is why have a large Japanese multinational, gone to a small, but well-respected, British start-up for a key part of the trains?

    As you say recycling is a key factor. so perhaps Nissan, Hyperdrive , Hitachi and Hyperdrive’s other customers like JCB are developing a strategy to recycle batteries.

    Consider.

    Could Britishvolt also be part of a plot hatched in a decent pub?

    There’s a lot of chemical and metallurgical experience in the North East.

    There’s also some ideas to prolong battery life coming out of Universities like Warwick.

    There’s certainly a lot of geographical coincidences.

    Comment by AnonW | June 2, 2021 | Reply


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