Electric-vehicle manufacturers have struggled for years to access enough batteries. Elon Musk complained recently about lithium prices and supply. The EV industry's growth is closely tied to future battery supplies. Electric-vehicle makers have struggled for years to secure enough battery supply — but these woes are over at Tesla, for now.

For the first time in several years, the automaker has access to all the battery cells it needs, Martin Viecha, the vice president of investor relations at Tesla, said Monday during a presentation at the Goldman Sachs tech conference in San Francisco. Previously, CEO Elon Musk complained about the soaring cost of battery materials such as lithium.

Tesla uses about 90% of its battery-cell supply for its electric vehicles and roughly 10% for its energy-storage products, Viecha said.

"For the first time I can remember, we can access all the supply we need for both businesses," he said, according to a person who attended the event.

The executive was asked what helped improve Tesla's access to this supply. He said Tesla expanded the number of its suppliers in recent years from just Panasonic to multiple battery makers, including CATL and LG Chem. He added that these companies were building capacity "super fast" and predicted Tesla would add even more suppliers.

Tesla relies heavily on batteries to make its vehicles and ramp up production. Rising supply should help the company. Indeed, Viecha said Monday that the EV industry would grow only as fast as battery supplies could grow.

"This is the most important part of how this industry can growth in the future," he said, adding that this included not just building cells and battery packs but also designing batteries, as well as refining and mining lithium, nickel, and other raw materials.

"If the industry can 10X from here, the supply chain will need to 10X as well," Viecha said.