Tesla Factory

Tesla Factory
Industry Automotive industry
Predecessor
Founded 2010 (2010)
Headquarters Fremont, California, United States
Products Battery electric vehicles
Services Automotive manufacturing
Owner Tesla Motors
Number of employees
 6,000[1]
Website Official website

The Tesla Factory is an automobile manufacturing plant in south Fremont, California, 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.[2] The plant is located in the East Industrial area of Fremont between Interstates 880 and 680, and employed around 6,000 people in June 2016.[1]

Background

Tesla Motors had planned for an assembly factory in Albuquerque, New Mexico, as a central location for shipping.[3][4] Construction was supposed to begin in April 2007, but was canceled.[5]

A separate greenfield factory to be built in San Jose, California was also announced.[6] However, the cost was prohibitive, and the company looked for alternatives.

The current facility was opened in 1962 as the GM Fremont Assembly, and between 1984-2009 used as a plant for New United Motor Manufacturing, Inc. (NUMMI), a joint venture between General Motors and Toyota[2][7] producing 357,809 cars and trucks in 1997.[8]

The plant is located in the South Fremont District between the Warm Springs BART station[9] and the California State Route 262 connecting I880 and I680. Union Pacific Railroad has tracks at the plant[10][11] delivering finished cars.[12] Rail freight transport is also to be used to receive batteries from Gigafactory 1.[13]

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,[14][15] for $42 million.[16][17]

Tesla Motors officially took possession of the site on October 19, 2010,[18] and opened it on October 27.[19] The state of California has supported the renewal, expecting tax income from sustained jobs.[20][21][22] The first retail delivery of the Tesla Model S took place during a special event held at the Tesla Factory on June 22, 2012.[23]

The former NUMMI (now Tesla) plant in Fremont, California

Facilities

Much of the 370-acre (16,000,000 sq ft; 1,500,000 m2) site was unused in 2013, with most activity concentrated in the 5,500,000-square-foot (510,000 m2) main building that does the final assembly of vehicles.[18] There were 4,500 parking spaces in 2016.[24]

Over $17 million of manufacturing equipment and spare parts were acquired from NUMMI and Toyota in 2011, at significant discounts compared to new equipment.[25]

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.[18] Two paint lines (one car body, one component) were constructed from 2015.[26][27][28]

The floors, walls and ceiling are painted white with skylights and high-efficiency lighting to create an environment similar to a laboratory.[29]

Tesla is building a casting foundry in Lathrop supporting the Fremont production.[30][31][32]

In 2016, Tesla purchased a neighboring 25-acre site[33] from housing developer[34] Lennar, and applied for permissions to almost double the amount of buildings and increase work force to about 9,000 people, preparing for the Model 3.[33][35][24][36]

Employees

Tesla Motors started production with 1,000 workers.[37] By 2013, this had risen to 3,000,[38] and to 6,000 people in June 2016.[1]

Production

New Tesla Model S cars at the Tesla Factory in 2012

The plant's first series production vehicle is the Tesla Model S full-sized battery electric sedan.

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.[39] Tesla expected to produce about 5,000 Model S sedans in 2012, with production ramping up to 20,000 in 2013 if necessary.[40] The first retail delivery of the Model S took place during a special event held at the Tesla Factory on June 22, 2012.[23]

Production grew from 15–20 cars completed/week in August 2012[41] to over 200 by November 5[42] and 400 by late December.[43][44] In late December Tesla revised their 2012 delivery projections down to 2,500 cars.[45]

Deliveries reached 6,892 units in the last three months of 2013.[46] 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.[47]

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.[48] 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 was 700 cars per week.[49]

As of 2015, about 1,000 cars are made per week,[50][51] mostly to pre-orders.[12] Musk says they average around 20 changes to the S per week.[52]

Production of the Model X joined the Model S during 2015,[53] following a short reconfiguration of the production line in July 2014.[54] The first Model X that didn't need corrections was made in April 2016.[55]

On July 2, 2015, Tesla Motors announced that it had delivered a total of 21,537 vehicles in the first half of 2015. All vehicles were manufactured at the Fremont plant.[56]

In May 2016 Tesla raised $1.46 billion in stock, of which $1.26 billion is to prepare production of the Model 3 scheduled for late 2017.[57][58]

On August 3, 2016, Tesla Motors announced that it was consistently producing 2,000 vehicles per week at the end of Q2 2016.[59][60] About 2,500 workers operate the day shift and 2,000 attend the night shift.[24]

Tesla makes many parts itself, which is unusual in the auto business. Tesla also works with 300 suppliers around the world, of which 50 are in Northern California, and 10 in the San Francisco Bay Area.[61] Tesla's dashboard supplier SAS rents a 142,188-square-foot building near the factory, beginning in January 2017 with 200 employees.[62] Other suppliers to have opened facilities in the area to be close to Tesla include Eclipse Automation and Futuris Automotive Group.[63]

Tesla Model S manufacturing process

Overview

The manufacturing process uses more than 160 specialist robots, including 10 of the largest robots in the world,[64] which are named after X-Men characters.[65][66][67] 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.[68] Around 60% of the car parts are sourced from North America,[69] while Japan is the second-biggest source of components as of March 2015.[70] Design engineers also work at the factory itself, rather than a separate facility.[7][71]

Each vehicle is made to order with a two to three-month wait time for delivery,[72] although individual vehicles only take between three and five days to complete the assembly process.[64] The assembly line moves at a speed of 5 cm/s.[73] Tesla prefers delivery by train rather than by truck, as costs and damages are less.[12]

Drive unit construction

Motor construction

A complete Tesla Model S alternating current electric motor that has had a section removed from the stator to show the rotor inside.

The alternating current electric motor is constructed in-house. The main components of the motor are the stator and rotor.[74]

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.[74] 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.[74] 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.[74]

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 then is moved to the general assembly area to be installed into the car.[74]

Battery pack construction

Each Model S battery pack uses 7,104 '18650' lithium-ion battery cells (right). A smaller AA battery is on the left for scale.

The Model S 85s battery pack contains 7,104 '18650' lithium-ion battery cells in 16 modules[75] wired in series (14 in the flat section and two stacked on the front).[76] Each module contains six groups[77] of 74 cells[78] wired in parallel; the six groups are then wired in series within the module.[78][79][80][81] As of June 2012 the battery pack uses modified Panasonic NCR18650A 3100mAh cells with nickel-cobalt-aluminum cathodes.[82][83]

The use of commodity cells, similar to those found in laptops and mobile phones, is in contrast to every other electric vehicle manufacturer who use specialized large format Li-Ion cells.[84] The liquid-cooled battery pack uses an intumescent gel to aid in fireproofing and even heat distribution.

Body construction

Aluminium coil blanking

98% of the Tesla Model S body is constructed from aluminium[74] and is produced from between 50 and 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).[64]

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.[68] 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.[74] The blank aluminium sheet 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.[64]

Drive unit installation

The car is raised and the drive unit is installed into the rear axle assembly. The drive unit provides power directly to the wheels without a drive shaft.[74]

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 center of gravity[74] to 18 inches (46 cm).[85][86] 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.[87][88]

Safety incidents

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.[89]

See also

References

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External links

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