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• Store cells properly

  • Store in well cooled area

  • Store away from crushing hazards

• Sand

  • When lithium ion cells catch on fire they are very difficult to put out, because the combustion of the chemicals creates its own oxidizer and heat. Sand can be used to prevent or put out fires because they have a high thermal mass and can possibly absorb the heat of a lithium ion battery fire

• Run away

  • lithium ion dust is very toxic, and smells very funny (we know from experience)

Fusible Links

In order to connect cells together in parallel, fusible links are used. Fusible links are just fuses but in the form of an electrical link.

Fusible links could be any of the following:

• nickel strips

  • https://www.digikey.com/en/products/detail/littelfuse-inc/156.5610.5502-ND/3426786?utm_adgroup=&utm_source=google&utm_medium=cpc&utm_campaign=PMax%20Shopping_Product_Medium%20ROAS%20Categories&utm_term=&utm_content=&utm_id=go_cmp-20223376311_adg-_ad-__dev-c_ext-_prd-3426786_sig-CjwKCAjwlbu2BhA3EiwA3yXyuwDv1Y_1BEe2JE695M7EoFtInjz96WjOaF3DzOFkyQJaLHRrIiEEPBoCemMQAvD_BwE&gad_source=1&gclid=CjwKCAjwlbu2BhA3EiwA3yXyuwDv1Y_1BEe2JE695M7EoFtInjz96WjOaF3DzOFkyQJaLHRrIiEEPBoCemMQAvD_BwE

  • https://batteryhookup.com/products/nickel-fuse-2p-wide-continuous-roll-by-the-foot-18650-cell-level-fusing

  • Connection to cell options

    • Spot welding (we do this NER 22 and 24)

      • cheaper, easier

    • Laser welding

      • stronger

      • more expensive

• FPC (flex PCB)

  • (dont have a link but same idea as nickel fuse)

  • Connection to cell options

    • Spot welding

    • Laser welding

• SMD (surface mount device)

  • Done in NER 17 for FHE but not passing FSAE rules, discontinued. Technically not fusible link because its just SMD fuses

• Wires

  • https://www.jttproducts.com/store/p/706-JT-T-208F-14-AWG-Green-Fusible-Link-Wire-with-5/16-Stud-1-Ft.aspx

  • Connects to cell with wire bonding

    • wire bonding is very expensive

    • needs sponsor

Comments on fusible links:

• You can avoid having to fuse parallel connections by not having any parallel connections. This can be done using pouch cells because they typically have much higher energy and power capacity