A cylindrical [lithium-ion cell](/entry/_5GDsp3jxMTJ1liBePo9sgT) is a cylindrical [cell](/entry/_5GDsp3jxMTJ1liBePo9sgT) made from a single long "sandwich" of the positive electrode, separator, negative electrode, and insulating sheet which is then rolled and inserted into a hollow cylinder casing. This cell design is often called a "[jelly roll](/entry/_6hMuZdGzPja2AoKOTo4hiH)" or "swiss roll" because the cross section looks like a swiss roll.

TechConcept

Cylindrical lithium-ion cell

Electrochemical cell

Electrolytic cell

Lithium-ion cell

Secondary cell

18650 cell

21700 cell

4680 cell

Galvanic cell

Jelly roll

TROES  Cabinet (240 kWh)

TROES  Cabinet (2437 kWh)

TROES  Cabinet (4874 kWh)

TROES Indoor Cabinet (880 kWh)

TROES Outdoor Cabinet (570 kWh)

Tesla Powerpack

Tesla Powerwall

The TROES 240 kWh cabinet is a lithium-ion battery energy storage system ([BESS](/entry/_5yfaUcmCgtN6K9FDNKdjbp)) for use outdoors. The system is contained in a 10 foot long enclosure. It is supported by HVAC, thermal runaway protection, power conversion systems, and cloud-based operation. The cabinet may also contain fire suppression systems. It is designed by Canadian battery designed and manufacturer [TROES Corp.](/entry/_4q8GTHzdDLFcvfEbtc9kqB).

A galvanic cell, also known as a voltaic cell, is an [electrochemical cell](/entry/_3VVHFqLRvQtI1YzMP7OxVV) that generates electrical energy through chemical reactions, specifically redox reactions. Galvanic cells are the building blocks of [batteries](/entry/_5HYZND6114KVUtCGjFC8mT).

The Tesla Powerpack is a family of rechargeable [lithium-ion battery](/entry/_5GDsp3jxMTJ1liBePo9sgT) stationary energy storage products, intended for use by businesses or on smaller projects from power utilities. They are manufactured by [Tesla Energy](/entry/_27PVRRLDkKIBKhxcgh1U3q), the clean energy subsidiary of [Tesla, Inc](/entry/_27DEebL0FX8pdOLEws9e7R). The Powerpack stores electricity for time of use load shifting, backup power, demand response, microgrids, renewable energy integration, frequency regulation, and voltage control.^[Some text from Wikipedia, ["Tesla Powerpack"](https://en.wikipedia.org/wiki/Tesla_Powerpack)]

An electrolytic cell is a [cell](/entry/_3VVHFqLRvQtI1YzMP7OxVV) containing an electrolyte in which an applied voltage causes a reaction to occur that would not occur otherwise (such as the breakdown of water into hydrogen and oxygen).

An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions. Those which generate electrical energy are called galvanic cells, and are the principal buidling block of [electric batteries](/entry/_5HYZND6114KVUtCGjFC8mT).

The Tesla Powerpack 2 is a variant of the [Tesla Powerpack](/entry/_2r9FBlVHH2Kb9UX4THbcKg) with capacity {this.get(prop=[[/prop/_3YBzKxiYFNL4fKmPmwkR02]])}.

Tesla Powerpack 2

The TROES 2437 kWh cabinet is a lithium-ion battery energy storage system ([BESS](/entry/_5yfaUcmCgtN6K9FDNKdjbp)) for use outdoors. The system is contained in a 20 foot long enclosure. It is supported by a fire suppression system, HVAC, thermal runaway protection, power conversion systems, and cloud-based operation.  It is designed by Canadian battery designed and manufacturer [TROES Corp.](/entry/_4q8GTHzdDLFcvfEbtc9kqB).

The protection circuit (center) of an [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc). The cell on the left includes the protection circuit, while the one on the right has had the circuit removed.

18650 cell protection circuit

A secondary cell is a [galvanic cell](/entry/_2azW7zIxVCeNrbXuRrsm2k) that can also be used as an [electrolytic cell](/entry/_2uDtUtOWJCL33X7zTAK8dK); in other words, it can be charged, then used to supply electrical energy to a device, then charged again. Rechargeable batteries are comprised of one or more secondary cells, as opposed to disposable batteries which are comprised of [primary cells](/entry/_7OCTF7b5Z4wM7KvEE16OtK).

The Tesla Powerwall is a family of rechargeable lithium-ion battery stationary home energy storage products manufactured by [Tesla Energy](/entry/_27PVRRLDkKIBKhxcgh1U3q). The Powerwall stores electricity for solar self-consumption, time of use load shifting, and backup power. ^[Some text from Wikipedia, [""](https://en.wikipedia.org/wiki/Tesla_Powerwall)]

A cylindrical [18650 lithium-ion cell](/entry/_7RHY0mKlOEp2xsahAaNcbc) without the casing on, showing the [jelly roll](/entry/_6hMuZdGzPja2AoKOTo4hiH) inside.

18650 cell disassembled

An [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc) and an American quarter for scale.

A lithium-ion cell is a [secondary cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r) ("rechargeable battery") that uses a lithium compound as its cathode (positive terminal) material, and typically graphite as the anode (negative terminal) material. Lithium-ion cells feature high energy density and low self-discharge, making them ideal for a variety devices including mobile phones and electric vehicle batteries.

The TROES 4874 kWh cabinet is a lithium-ion battery energy storage system ([BESS](/entry/_5yfaUcmCgtN6K9FDNKdjbp)) for use outdoors. The system is contained in a 40 foot long enclosure. It is supported by a fire suppression system, HVAC, thermal runaway protection, power conversion systems, and cloud-based operation.  It is designed by Canadian battery designed and manufacturer [TROES Corp.](/entry/_4q8GTHzdDLFcvfEbtc9kqB).

18650 cells

This proprietary battery module was developed by Tesla Inc for the original Model S (85kWh editions).
            Sixteen of these modules were assembled together to create the Tesla 85kWh battery in the first generation Model S, which was produced from 2012 until 2016.

Tesla 18650 battery module (5kWh)

The jelly roll or Swiss roll design is the design used in the majority of cylindrical rechargeable batteries,  including nickel–cadmium (Ni-Cd), nickel-metal hydride (Ni-MH), and lithium-ion (Li-ion).  The design has this name because the cross section of the battery looks like a Swiss roll ^[from Wikipedia, ["Jelly roll"](https://en.wikipedia.org/wiki/Jelly_roll_(battery))].

A 4680 cell is a [cylindrical lithium-ion](/entry/_75HaEKOi2Ir5UV84KH3CGk)
[cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r), with a diameter of {this.get(prop=[[/prop/_3JjzqBJ9YLtRGuesdK0lWb]])}
and a length of {this.get(prop=[[/prop/_1PPhmzTVqhSwjbyZtAsIBm]])}.
The cell was announced at Tesla's battery day in 2020, along with plans for the cell to power future Tesla vehicles.
Chinese battery manufacturer BAK later announced a 4680 model, with unknown chemistry. 
It is significantly larger than its predecessors, with a diameter more than twice that of the
[18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc) (which powered the [Tesla 85kWh Battery](/entry/_6dF6GUIrPx8ToREmsFAZ5R)), 
and the [21700 cell](/entry/_725MCg9IOqXqKUUA2cEoSc).
Because of this, the 4680 cell boasts a significantly higher storage capacity of {this.get(prop=[[/prop/_7jO8Fx7LRlDUKaEXBSCYjI]])}.

The **21700 cell** (also called **2170 cell**) is a [cylindrical lithium-ion](/entry/_75HaEKOi2Ir5UV84KH3CGk) [cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r) introduced in 2017 by Panasonic. With a diameter of 21mm and a length of 70mm, it is slightly larger than the standard [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc). Due to its larger area and a smaller separation between the anode and cathode, the 2170 boasts a larger capacity than the [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc). The 2170 cell is used in the Tesla Model 3 and Y vehicles, and the [Tesla Powerwall 2](/entry/_LmaF231kKLrJmYWeVZ8qS) and [Powerpack 2](/entry/_3XaDmRIYYb0F01anoSHKLj).

Top (positive) and side view of several [18650 cells](/entry/_7RHY0mKlOEp2xsahAaNcbc). The green and yellow cells have the standard length of 65mm, while the pink cells are longer due to the presence of a protection circuit.

18650 cells of different lengths

An 18650 cell is a standard format [cylindrical lithium-ion](/entry/_75HaEKOi2Ir5UV84KH3CGk)
[cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r), with a diameter of {this.get(prop=[[/prop/_3JjzqBJ9YLtRGuesdK0lWb]])}
and a length of {this.get(prop=[[/prop/_1PPhmzTVqhSwjbyZtAsIBm]])} (slightly larger than a
[AA battery](/entry/_1bWGkkQDaPxHwmcMkO5cbu)).
The 18650 cell has been used since the late 1990s and has been popular for a wide range of applications that
require a rechargeable battery - such as flashlights, laptops, power tools, and even electric vehicles. Due
to the popularity of the 18650 cell, they are usually an easily available, well-understood, and affordable
option.

The TROES Indoor Cabinet is an 880 kWh lithium-ion battery energy storage system ([BESS](/entry/_5yfaUcmCgtN6K9FDNKdjbp)) for use indoors. The cabinet consists of 8 modules and is supported by thermal runaway protection, power conversion systems, and cloud-based operation  The cabinet is designed by Canadian battery designed and manufacturer [TROES Corp.](/entry/_4q8GTHzdDLFcvfEbtc9kqB).

The Tesla Powerwall 2 is a variant of the [Tesla Powerwall](/entry/_4cNGgSH4cnJhjiQw9sjSri) with capacity {this.get(prop=[[/prop/_3YBzKxiYFNL4fKmPmwkR02]])}.

Tesla Powerwall 2

The TROES Outdoor Cabinet is an 570 kWh lithium-ion battery energy storage system ([BESS](/entry/_5yfaUcmCgtN6K9FDNKdjbp)) for use outdoors. The cabinet consists of 2 modules and is supported by thermal runaway protection, power conversion systems, and cloud-based operation.  The cabinet is designed by Canadian battery designed and manufacturer [TROES Corp.](/entry/_4q8GTHzdDLFcvfEbtc9kqB).

Type of	TCLithium-ion cell
Has types	TC18650 cell, TC21700 cell, TC4680 cell
Has part	TCJelly roll
Used in	PTesla 18650 battery module (5kWh), PTesla Powerpack 2, PTesla Powerwall 2
Related images	, , , ,
Explore Graph

Cylindrical lithium-ion cell

Properties