WeLion


Beijing WeLion New Energy Technology Co., Ltd., known simply as WeLion New Energy or WeLion, is a Chinese battery manufacturer specializing in semi-solid and solid state batteries for use in electric vehicles and energy storage systems. The company is headquartered in the Beijing's Fangshan District, and is a spinoff from the Laboratory of Renewable Energy of the Institute of Physics of the Chinese Academy of Sciences. It is best known for supplying the world's first mass produced semi-solid-state battery cells for an automotive traction battery application, in the form of Nio's 150kWh swappable battery pack.

History

The company was established in 2016 by founders Chen Liquan, Li Hong, and Yu Huigen. Chen Liquan is known as the "father of Chinese lithium battery technology", and was a doctoral advisor to Robin Zeng, founder of CATL. In August 2021, WeLion received a investment from Geely, Huawei and Xiaomi. The investments are from Hubei Xiaomi Yangtze River Industry Investment Fund Partners and Shenzhen Hubble Technology Investment Partners, and Ningbo Geely Blue Initiative Business Management Partners. The investments put WeLion's valuation at .
On November 4, 2022 WeLion disclosed that it had secured in Series D financing.
In December 2025, it was revealed through filings that WeLion had agreed to undergo pre-IPO tutoring for a potential listing on the ChiNext stock exchange.
In a televised interview in December 2025, WeLion chairman Yu Huigen stated that the company had created solid-state batteries with an energy density of 824Wh/kg in laboratory conditions, and that the company was aiming to exceed 1000Wh/kg as a long term goal.

Partnerships

Nio

On January 9, 2021, at Nio's 'Nio Day 2020' event, Nio announced that a 150kWh semi-solid state battery pack would later be made available. Later, it was revealed that WeLion would be the supplier of the battery cells. On June 30, 2023, Nio received the first shipments of the battery cells, and the packs first became available for rent by the public in mid-2024. The semi-solid state battery cells allow for a 50% higher energy capacity, with an energy density of 360Wh/kg, in the same dimensions compared to a conventional pack, with only a minor weight increase, allowing for a range of range in the ET7 sedan.

Tianqi Lithium

On May 20, 2021 WeLion signed an agreement with a subsidiary of Tianqi Lithium to form a joint venture. The aim of the joint venture is to develop, produce and sell lithium anode materials, and manufacturing equipment and ingredients for battery pre-lithiation processes.

Ronbay Technology

In April 2022, WeLion signed a five-year agreement with Ronbay Technology for the supply of at least 30,000 tons of battery cathode materials. The agreement stipulates that Ronbay will be WeLion's primary supplier of high-nickel cathode materials for use in NMC chemistry solid-state batteries.

JAC Yiwei

On April 22, 2024 WeLion and JAC signed an agreement for the supply of semi-solid state battery cells for use in Yiwei brand cars. The batteries will be cylindrical 4695 format cells, and will be used in Yiwei's second generation DI platform, with the first vehicle expected to launch in 2025.

Longquan Energy Storage

On June 6, 2024 the Longquan Energy Storage project located near Longquan, Zhejiang was connected to the grid. The now operational first phase has a capacity of 200MWh and an output of 100MW and uses WeLion's semi-solid state cells, making it the world's first large scale use of semi-solid state batteries in a battery energy storage system context. The project is run by state-owned Power China, and is eventually planned to have a 400MWh capacity and 200MW output on the 40-acre site. It uses LFP solid-liquid hybrid electrolyte battery cells with a cell capacity of 280Ah, energy density of 165Wh/kg, a rated lifespan of 6000 cycles, and an operating range between. Annual discharge is estimated to be over 60,000GWh.

Facilities

WeLion is headquartered in Beijing and currently has four production facilities located throughout China.
LocationOperationsSizeCapacityBuild Date
Fangshan, BeijingHeadquarters4.66 + 10.1ha
Fangshan, BeijingPrimary R&D center4.66 + 10.1ha
Fangshan, BeijingSolid-state battery manufacturing4.66 + 10.1ha
8GWh2025
Zibo, ShandongSemi-solid & solid state battery manufacturing36.6ha
20GWh
100GWh 		September 2023
Liyang, JiangsuLow cost non-aviation device battery manufacturing2.53ha
0.2GWhAugust 2020
Huzhou, ZhejiangAutomotive battery manufacturing4.66 + 33.3ha
2 + 20GWhQ3 2022 + Q4 2025
Huzhou, ZhejiangSatellite R&D center4.66 + 33.3ha
July 2023
Shaoxing, ZhejiangBattery materials manufacturing1.5ha10kilotonEnd of 2023
Shenzhen, GuangzhouSatellite R&D and solid-state testing center5742m20.6GWhMarch 2025

Beijing Fangshan Base

  • Headquarters, R&D and solid-state battery mass production
  • 4.66 + 10.1ha
  • 8GWh capacity
  • 2025

    Zibo Base, Shandong

  • Energy storage base
  • 20GWh capacity
  • September 2023
  • semi-solid state and solid state battery cells
On February 25, 2022 WeLion held a groundbreaking ceremony for a new battery factory project in the city of Zibo located in eastern Shandong. The project involves a total investment of in a 550mu facility, resulting in a projected annual capacity of 100 GWh. The first phase of the project involved of investment and is be capable of 20 GWh of annual capacity, and was completed in September 2023; it will manufacture semi-solid and solid-state batteries. At the time, WeLion claimed that the facility has the highest safety factor and energy density in China.

Liyang, Jiangsu Base

  • Low-altitude economic power base
  • 2.53ha
  • 0.2GWh capacity
  • August 2020
Manufactures 320Wh/kg low cost power batteries for use in low-altitude applications, such as drones, robots and portable power supplies, according to WeLion's website.

Huzhou, Zhejiang base

  • Car power base
  • 4.66 + 33.3ha
  • 2 + 20GWh capacity
  • Q3 2022 + Q4 2025
This facility manufactures semi-solid state power batteries for use in electric vehicles. Construction of this factory in Huzhou, Zhejiang began in 2021, and was completed in Q3 of 2022. On November 22, 2022 WeLion held a ceremony commemorating the production of the first battery cell on the production line at the facility. On June 30, 2023 WeLion held a ceremony at the Huzhou factory for their first delivery of battery cells to Nio. The cells use a semi-solid state electrolyte, and have an energy density of 360Wh/kg, and are used in a 150kWh swappable battery pack made by Nio.
WeLion's R&D center for the Yangtze River Delta region is also located in Huzhou, and its completion was also announced at the ceremony.

Shaoxing, Zhejiang pulp base

  • Solid state materials and solid state battery production base project
  • 1.5ha
  • 10,000 tons capacity
  • End of 2023 production date
Supplies battery materials for final manufacture at the nearby Huzhou factory.

Shenzhen Pingshan, Guangdong

  • Solid-state battery R&D base
  • 5742m2
  • 600MWh capacity
  • March 2025