UL developing safety standard for second-life EV batteries


There are currently more than 1.5 million EVs on the world’s roads, and over the next year or two, the first wave of batteries will be coming to the end of their automotive life cycles, while retaining around 80% of their original capacities, still sufficient for a number of stationary energy storage applications.

Before beginning its second life however, each individual battery must be evaluated, as each has been exposed to different charging and discharging conditions throughout its lifetime. To help ensure that EV batteries are safely deployed in their new applications, the independent safety standards organization UL is developing the safety standard UL 1974, with input from automakers, battery reclaimers, electric utilities and academic institutions.

The new standard aims to provide users with confidence that a used EV battery will function effectively in a residential, commercial or utility-scale storage application.

In UL’s system, batteries will be classified for their state of health, then bad cells weeded out through testing processes that determine what part of a battery pack will be swapped out, what will be replaced, and what will be recycled.


SEE ALSO: Spiers New Technologies develops advanced battery classification techniques


Source: Solar Industry

  • Bill Davis

    I see the “80% of their original capacities” figure used a lot when folks talk about second life batteries, and I think that’s giving the consumer too much credit for replacing their batteries. For example, I finally sucked it up and replaced my original LEAF battery at 50% degradation. Of course, had a warranty covered mine I would have replaced it sooner, but what mfgr will warranty 80% of capacity at the bottom end?

    • Bill Davis

      OK, in the very next article here today on Torqeedo’s products I see one example of an 80% warranty! “9-year warranty on battery bank
      A reliable battery lifespan is key for electric boating economics. That is why Deep Blue comes with a long-term battery capacity warranty: 9 years after commissioning, the batteries will still have 80 % of their original capacity, even if you use them every day.”

    • Jason Willhite

      You did the Nissan battery replacement for your Leaf? As a Leaf owner I’m very curious to know how that went, if the newer battery has been better and what was the price (if you don’t mind me asking)?

      • Bill Davis

        It has only been a month, so I can’t judge the battery yet. It works just as well as the original one did in the beginning. I went into my dealer and they reached out to Nissan due to my 50% degradation. Nissan offered a 50/50 cost split so I took them up on it.

        • Jason Willhite

          Good to hear. I hope the new battery does much better than the first one

  • Matjaž Ciglar

    Nonsense, second life batteries are unreliable and require to much manual work to be affordable. Manual disassembly, selection, assembly, delivery… for what? Couple of years of operation before new reused pack is needed?

    • Ron Freund

      @matjaciglar:disqus : you seem to forget that the service that batteries provide in an automobile (where they are removed from) is much more severe than the service into which they are placed (float service, with steady discharge rates, generally no major rate changes). This makes them ideal, as many experiments have proven. So part of the “weeding out” process of qualification removes the weak ones with little remaining capacity.
      You expect to power an EV with spent EV batteries? That’s not what the intent is.