Nio today put into operation two battery swap stations at oil giant CNPC's gas stations.

Sinopec and CNPC are known in China as the big two oil giants, and Nio, which announced plans to build battery swap stations with the former on April 15, has now also joined hands with the latter.

Nio today put into operation two battery swap stations it built with CNPC in Shaanxi Province in northwestern China, marking a major milestone in its efforts to expand its energy replenishment network.

One of the battery swap stations, located in a CNPC gas station area in Xianyang, Shaanxi, is the first second-generation Nio battery swap station built by the two companies, according to a statement posted by the EV maker on its app.

(Image credit: Nio)

Another battery swap station in Yulin, Shaanxi Province, is also located in the CNPC gas station area, which is Nio's 639th battery swap station in China and the 17th in Shaanxi Province.

Nio will continue to work with CNPC on new energy vehicle mobility and charging and battery swap facilities in Shaanxi, the company said.

It is worth noting that this is not the first time Nio cooperates with CNPC.

On September 30, Nio and CNPC completed a supercharging station with four supercharging piles at a gas station in Xi'an, the capital of Shaanxi Province, the first such facility jointly built by the two.

On April 15, Nio and Sinopec signed a strategic cooperation agreement and opened their first battery swap station at a Sinopec gas station in Beijing.

This is Nio's first second-generation station and the company's 201st battery swap station in China.

As of November 3, Nio and Sinopec had built 21 battery swap stations, 19 supercharging stations and 10 destination charging stations, according to data released by the company earlier this month.

By the end of 2020, Sinopec had 30,713 gas stations and CNPC had 22,619, according to their previously announced annual financial reports.