Tesla Motors has posted its best sales quarter ever, with global sales more than doubling year-on-year to 24,500.The Nasdaq reports that this comes as the electric-vehicle maker prepares to raise the added cash it needs to begin production of its Model 3 sedan, which is aimed at the mass market.It says Chief Executive Elon Musk wanted a strong third quarter to help build his fund-raising case for the Model 3's production line and for the company's Gigafactory, a massive battery-making facility in Nevada.Tesla says its sales included 15,800 Model S sedans and 8,700 Model X sport-utility vehicles.  An additional 5,500 cars were in transit to customers and will be counted in fourth-quarter sales.The announcement comes as good news after the fatal crash of a Tesla car which was in its autopilot mode when it collided with a lorry in Florida.