Traction battery and oil well: what they have in common

1. Step 1. Traction battery — has part — Lithium-ion battery. The battery is assembled from many lithium-ion cells.
2. Step 2. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — has part — Diesel engine. Diesel-electric submarines.
5. Step 5. Diesel engine — is part of — Drilling rig. The drive.
6. Step 6. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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