Battery pack

A battery pack is a set of any number of (preferably) identical batteries or individual battery cells.[1][2] They may be configured in a series, parallel or a mixture of both to deliver the desired voltage and current. The term battery pack is often used in reference to cordless tools, radio-controlled hobby toys, and battery electric vehicles.

Components of battery packs include the individual batteries or cells, and the interconnects which provide electrical conductivity between them.[3] Rechargeable battery packs often contain voltage and temperature sensors, which the battery charger uses to detect the end of charging.[4] Interconnects are also found in batteries as they are the part which connects each cell, though batteries are most often only arranged in series strings.

When a pack contains groups of cells in parallel there are differing wiring configurations which take into consideration the electrical balance of the circuit. Battery Management System are sometimes used for balancing cells in order to keep their voltages below a maximum value during charging so as to allow the weaker batteries to become fully charged, bringing the whole pack back into balance.[5] Active balancing can also be performed by battery balancer devices which can shuttle energy from strong cells to weaker ones in real time for better balance.[5] A well-balanced pack lasts longer and delivers better performance.[6][1]

For an inline package, cells are selected and stacked with solder in between them. The cells are pressed together and a current pulse generates heat to solder them together and to weld all connections internal to the cell.

Calculating state of charge

SOC, or state of charge, is the equivalent of a fuel quantity remaining. SOC cannot be determined by a simple voltage measurement, because the terminal voltage of a battery may stay substantially constant until it is completely discharged. In some types of battery, electrolyte specific gravity may be related to state of charge but this is not measurable on typical battery pack cells, and is not related to state of charge on most battery types. Most SOC methods take into account voltage and current as well as temperature and other aspects of the discharge and charge process to in essence count up or down within a pre-defined capacity of a pack.[7][8] More complex state of charge estimation systems take into account the Peukert effect which relates the capacity of the battery to the discharge rate.[9]

Advantages

An advantage of a battery pack is the ease with which it can be swapped into or out of a device. This allows multiple packs to deliver extended runtimes, freeing up the device for continued use while charging the removed pack separately.

Another advantage is the flexibility of their design and implementation, allowing the use of cheaper high-production cells or batteries to be combined into a pack for nearly any application.

At the end of product life, batteries can be removed and recycled separately, reducing the total volume of hazardous waste.

Disadvantages

Packs are often simpler for end users to repair or tamper with than a sealed non-serviceable battery or cell. Though some might consider this an advantage it is important to take safety precautions when servicing a battery pack as they pose a danger as potential chemical, electrical, and fire risks.

Air travel restrictions

Per US Federal Aviation Administration regulations, power banks in the United States are not allowed in checked-in luggage. Power banks up to 100 Wh are allowed as carry-on and those 101 Wh to 160 Wh are allowed with airline approval.[10]

Battery cases

Battery cases are small power banks attached to the rear side of a mobile phone like a case. Power may be delivered through the USB charging ports,[11] or wirelessly.[12] Battery cases also exist in the form of a camera grip accessory, as was for the Nokia Lumia 1020.[13] For mobile phones with removable rear cover, extended batteries exist. These are larger internal batteries attached with a dedicated, more spacious rear cover replacing the default one. A disadvantage is incompatibility with other phone cases while attached.[14]

Rental/exchange

In some parts of the world, there are kiosk based power bank rental or subscription services. Customers pay for the use of power bank for a specified period of time and return the depleted power bank to the kiosk.[15] In one case with a brand called FuelRod, it was sold at an elevated price at various amusement parks with the understanding that they get a perk of free exchange at participating locations.[16] FuelRod moved to discontinue the free exchange in 2019 and resulted in a class-action lawsuit reaching a settlement that early adopters would be grandfathered to free exchange privileges.[17]

See also

References
  1. Hassini, Marwan; Von Hohendorff Seger, Pedro; Redondo-Iglesias, Eduardo; Pelissier, Serge; Venet, Pascal (27 October 2023). "Capacity Dispersion and Impact of Outliers in a Second Life Battery". 2023 IEEE Vehicle Power and Propulsion Conference (VPPC). Milan, Italy. pp. 1–4. doi:10.1109/VPPC60535.2023.10403384. ISBN 979-8-3503-4445-5. S2CID 267337334.{{cite book}}: CS1 maint: location missing publisher (link)
  2. Li, Wei; Garg, Akhil; Xiao, Mi; Peng, Xiongbin; Le Phung, My Loan; Tran, Van Man; Gao, Liang (2020-10-10). "Intelligent optimization methodology of battery pack for electric vehicles: A multidisciplinary perspective". International Journal of Energy Research. 44 (12): 9686–9706. Bibcode:2020IJER...44.9686L. doi:10.1002/er.5600. ISSN 0363-907X.
  3. Harper, Gavin; Sommerville, Roberto; Kendrick, Emma; Driscoll, Laura; Slater, Peter; Stolkin, Rustam; Walton, Allan; Christensen, Paul; Heidrich, Oliver; Lambert, Simon; Abbott, Andrew; Ryder, Karl; Gaines, Linda; Anderson, Paul (6 November 2019). "Recycling lithium-ion batteries from electric vehicles". Nature. 575 (7781): 75–86. Bibcode:2019Natur.575...75H. doi:10.1038/s41586-019-1682-5. ISSN 1476-4687. PMID 31695206.
  4. Simpson, Chester (1995). "Battery charging" (PDF). National Semiconductors.
  5. Cao, Jian; Schofield, Nigel; Emadi, Ali (2008). "Battery balancing methods: A comprehensive review". 2008 IEEE Vehicle Power and Propulsion Conference. pp. 1–6. doi:10.1109/VPPC.2008.4677669. ISBN 978-1-4244-1848-0. S2CID 42399871. Retrieved 2024-01-19.
  6. Duraisamy, Thiruvonasundari; Kaliyaperumal, Deepa (2020-06-01). "Active cell balancing for electric vehicle battery management system". International Journal of Power Electronics and Drive Systems (IJPEDS). 11 (2): 571. doi:10.11591/ijpeds.v11.i2.pp571-579. ISSN 2722-256X.
  7. Shuo Pang; Farrell, J.; Jie Du; Barth, M. (2001). "Battery state-of-charge estimation". Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148). pp. 1644-1649 vol.2. doi:10.1109/ACC.2001.945964. ISBN 0-7803-6495-3. S2CID 57885701. Retrieved 2024-01-19.
  8. Hassini, Marwan; Redondo-Iglesias, Eduardo; Venet, Pascal (19 July 2023). "Lithium–Ion Battery Data: From Production to Prediction". Batteries. 9 (7): 385. doi:10.3390/batteries9070385. ISSN 2313-0105.
  9. "State of charge (SoC) estimation on LiFePO4 battery module using Coulomb counting methods with modified Peukert". doi:10.1109/rICT-ICeVT.2013.6741545. S2CID 5621134. Retrieved 2024-01-19.
  10. McInnis, Kaitlyn (2022-05-18). "What's allowed in — and prohibited from — your carry-on bag, according to the TSA's rules". CNN Underscored. Retrieved 2023-06-21.
  11. Stein, Scott. "Apple Smart Battery Case for iPhone 6S review: Addressing the iPhone's biggest weakness". CNET.
  12. "Galaxy Note 7 S View Standing Cover and Battery Pack hands on". Android Authority. 2 August 2016.
  13. "IRL: Testing the Nokia Lumia 1020's optional camera grip / battery case". Engadget. 2013-09-16.
  14. Klug, Brian (2013-07-23). "Samsung Galaxy S 4 ZeroLemon 7500 mAh Extended Battery Review". Anandtech.com.
  15. "Would you rent a power bank on the go?". Mintlounge. 2022-07-25. Retrieved 2023-06-21.
  16. "Class-action lawsuit seeks $5 million over portable chargers sold at Disney, Universal and SeaWorld parks". The Mercury News. 2019-11-05. Retrieved 2023-06-21.
  17. Tuttle, Brittani (2020-07-10). "FuelRod lawsuit ends; 'Founders' can still receive free swaps". Attractions Magazine. Retrieved 2023-06-21.
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