||Expansion of government R & D budgets on promoting electric vehicle (EV) adoption and charging infrastructure development is likely to continue to be a key component of ecological innovation policies. Using an original data set of non-patent literature (NPL) references extracted from patent documents pertaining EV charging technologies, this paper provides new evidence on the flows of knowledge with or without a scientific contribution from the business sector. Three main questions are addressed in this paper for measuring the value of knowledge produced by firms, which not only contributes towards a better understanding of EV but serves the purpose of fostering more partnerships and unlocking further investments in research. First, what information is most useful to the technological development? Even firms are increasingly encouraged to engage in EV innovation process, a relatively profound influence on knowledge transfer has not be exercised, especially in generating applied technologies measured by redefined average NPL citation compared to academic institutions. Patents with firm NPL have a special focus on inorganic chemistry and nanotechnology except as common issues identified related to climate change mitigation and energy storage. Second, which kind of firm’s contribution produces the most valuable research? The university-firm research collaborations have captured more attention from science to technology while knowledge produced solely by firms has been transferred to a broader distribution in geography. Finally, how scientific knowledge is commercialised? Patents with firm NPLs, in particular the one regarding networked infrastructure and energy generating have been transferred more frequently to companies and universities residing in the US, Japan, Canada and Germany between 2010 and 2014. However, patented technologies of electrical distribution network and charging batteries with non-firm NPLs are mainly assigned to companies in France and Korea between 2008 and 2013. The role of firm in knowledge and technology transfer needs to be further explored in a border technological field notwithstanding the gaps in NPL citation compared to academic institutions.