|Headquarters||Fremont, California, United States|
|Products||Battery electric vehicles|
The Tesla Factory is an automobile manufacturing plant in Fremont, California, US, and the principal production facility of Tesla Motors. The facility was formerly known as New United Motor Manufacturing, Inc. (NUMMI), a joint venture between General Motors and Toyota. The plant is located in the East Industrial area of Fremont between Interstates 880 and 680.
- 1 History
- 2 Facilities
- 3 Employees
- 4 Production
- 5 Tesla Model S manufacturing process
- 6 Safety
- 7 See also
- 8 References
- 9 External links
The current facility was opened in 1962 as the GM Fremont Assembly, and later used as a plant for New United Motor Manufacturing, Inc. (NUMMI), a joint venture between General Motors and Toyota. The plant is located in the East Industrial area of Fremont between Interstates 880 and 680 and employs around 3,000 people.
On May 20, 2010, Tesla Motors and Toyota announced a partnership to work on electric vehicle development and collaborate on the "development of electric vehicles, parts, and production system and engineering support". This included Tesla's partial purchase of the former NUMMI site, mainly consisting of the factory building, for $42 million.
Tesla Motors officially took possession of the site on October 19, 2010, and opened it on October 27. The first retail delivery of the Tesla Model S took place during a special event held at the Tesla Factory on June 22, 2012.
Much of the 370-acre (150 ha) site is unused, with most activity concentrated in the 5,500,000-square-foot (510,000 m2) main building that does the final assembly of vehicles.
Various parts of the NUMMI plant were planned to be modified to support Tesla vehicle production. For example, the passenger vehicle paint equipment was to be extensively modified through late 2011.[dated info]
Over $17 million of manufacturing equipment and spare parts were acquired from NUMMI and Toyota in 2011, at significant discounts compared to new equipment.
The floors, walls and ceiling are painted white with skylights and high-efficiency lighting to create an environment similar to a laboratory.
In 2011, Tesla Motors transitioned from hand-assembled "alpha builds" to "beta builds", production-validation vehicles built entirely at the Tesla Factory. These cars would also be used for system integration, engineering testing, and federal crash-testing and certification. Tesla expected to produce about 5,000 Model S sedans in 2012, with production ramping up to 20,000 in 2013 if necessary. The first retail delivery of the Model S took place during a special event held at the Tesla Factory on June 22, 2012.
Production grew from 15–20 cars completed/week in August 2012 to over 200 by November 5 and 400 by late December. In late December Tesla revised their 2012 delivery projections down to 2,500 cars.
Deliveries reached 6,892 units in the last three months of 2013. In December 2013, California announced it would give Tesla a US$34.7 million tax break to expand production by an estimated 35,000 vehicles annually from its Fremont, California plant.
Tesla announced that production was expected to climb from 600 cars per week in early 2014 to about 1,000 units per week by year-end. Tesla produced 7,535 units during the first quarter of 2014, and expected to produce 8,500 to 9,000 cars in the second quarter of 2014. As of early May 2014, the production rate is 700 cars per week.
Tesla Model S manufacturing process
The manufacturing process uses more than 160 specialist robots including 10 of the largest robots in the world, named after X-Men characters. Many of the Model S's unique components, including the battery pack, battery module, and drive units are manufactured in-house. The plant has a high level of integration compared with other modern car assembly plants, with most processes taking place within the Tesla Factory. This includes most of the stamping and machining, painting, and some coding. The hydraulic press lines used to stamp the body panels are the largest in North America and the 6th largest in the world. Around 60% of the car parts are sourced from North America. Design engineers also work at the factory itself, rather than a separate facility.
Each vehicle is made to order with a two to three-month wait time for delivery, although individual vehicles only take between three to five days to complete the assembly process. Tesla prefers delivery by train rather than by truck, as costs and damages are less.
Drive unit construction
The motor construction begins when a robot unspools and winds over 1⁄2 mile (0.80 km) of copper wire per motor. It then pulls the copper wire into a stack. The motor has three phases and so requires three coils of copper. A worker then lengthens and straightens each bundle of wire and inserts the hydraulic lift to transfer the motor to the next station.
A worker insulates each bundle of copper wire in a plastic sleeve to prevent the bundles from touching one another. The ends of the bundles are then snipped to the correct length. Lugs are added and crimped to form attachment points for the motor's three phases. A specialized automatic sewing machine then binds the coils together to keep them in place, the increased tightness of the binding provided by a robotic sewing machine increases the efficiency of the motor. The stator is then encased in a two part epoxy resin to help in evenly distributing the motor's heat. The stator is now complete and is inserted into a heated metal case, locking the stator inside as the case cools.
A worker uses a hoisting system to insert the rotor inside the stator completing the construction of the motor.
Additional drive unit components
A worker then installs the differential and other sections of the gearbox attaching it together using bolts, an air leak test is then conducted. The three phase tripole power inverter is then installed onto the top of the motor to convert direct current from the battery into alternating current for the motor to use. The motor then undergoes a series of automated tests taking 4 minutes to ensure correct function and moved to the general assembly area to be installed into the car.
Battery pack construction
The Model S 85s battery pack contains 7,104 '18650' lithium-ion battery cells in 16 modules wired in series (14 in the flat section and two stacked on the front). Each module contains six groups of 74 cells wired in parallel; the six groups are then wired in series within the module. As of June 2012[update] the battery pack uses modified Panasonic NCR18650A 3100mAh cells with nickel-cobalt-aluminum cathodes.
The use of commodity cells is in contrast to every other electric vehicle manufacturer who use specialised large format Li-Ion cells similar to those found in laptops and mobile phones. The liquid-cooled battery pack uses an intumescent gel to aid in fireproofing and even heat distribution.
Aluminium coil blanking
98% of the Tesla Model S body is constructed from aluminium and is produced from between 50 to 60 separate coils of aluminium each for various components. The coils are unwound, flattened and cut in a blanking machine; additional cutting is also done using laser cutter. The total weight of the aluminium used in the Model S is around 410 pounds (190 kg).
Tandem press lines
Stacked side panels that have been formed on the tandem press line.
A robot then transfers the aluminium blanks into the tandem press lines where the sheets are stamped into the various panels of the cars. The Schuler SMG hydraulic stamping press line is the largest in North America and the 6th largest in the world. The presses use up to 11,000 ton-force to form the body panels; the upper section applies 1400 tonnes of downward force and the lower section 130 tonnes. The blank aluminium sheet aluminium is stretched over the lower draw die and openings are cut with robots transferring the panels between processes. The workers then inspect each panel to ensure correct pressing, the parts are then stacked in frames and stored. The machines press one part every 6 seconds and create 5,000 parts per day.
Drive unit installation
Battery pack installation
The battery pack weighs almost 1,200 pounds (540 kg) and is delivered to the installation area and is raised into the car using a lift. Placing the battery pack under the cabin floor adds strength and rigidity to the car and lowers the vehicle's centre of gravity to 18 inches (46 cm). A titanium plate is installed over the battery pack which protects it in the event of a high-speed collision and to protect from road debris.
In November 2013 there was an accident when the low-pressure aluminum casting press failed, spilling molten metal on three workers and causing their clothing to catch fire. Tesla was fined US$89,000 by the California Division of Occupational Safety and Health for seven safety violations, six considered serious.
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We know from the diagnosis screen that the 85 kWh pack has 16 modules with 6 groups in series (so 96 groups in series): 
- US patent 8286743, Rawlison, Peter Dore, "Vehicle Battery Pack Ballistic Shield", issued 2012-10-16
- US patent 2007009787, "Method and Apparatus for Mounting, Cooling, Connecting, and Protecting Batteries", issued 2007-1-11
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- Official website
- The Tesla Factory: Birthplace of the Model S Tesla Motors photo tour
- Photo Tour of NUMMI from Edmunds.com[dead link]
- NPR's This American Life's full hour story of the creation and demise of NUMMI - episode #403 from This American Life
- "Brand New Tesla Factory", National Geographic video
- How Tesla Builds Electric Cars, A Wired 3 part documentary on the Tesla Factory.