What makes you say they've been a non-issue?
As far as I'm aware they've been an issue (outside of China) for the last 20 years.
The total lithium battery patent licensing market is estimated at less than 600 million USD a year. This is approximately nothing, given that the overall battery market is estimated at about $200B.
The pace of innovation is furious, and companies are treating patents more as a way to ensure MAD (Mutual Assured Destruction) rather than as a tool to get income.
I think we'll start seeing the first large lawsuits once the losers start realizing that they lost the innovation race.
Sorry we handicapped ourselves and are now complaining about a competitor? Seems silly. The west made this tech unusable. I was building ebikes in 2006/7 and A123 was entirely unavailable unless you went and salvaged power tool packs.
They never became available at a competitive price, and then China bought the rights....
Now I can buy them in bulk as a consumer for 1/15th the price.
Our system is not meant for innovation by small players or consumers. We want tech easily locked away behind a contract.