Every battery stripped down to its fundamentals, comprises two terminals that exchange ions through an electrolyte. Materials may differ, but the battery basics are universal. Strictly speaking, we call a single set of them a ‘cell’, while two or more joined in series or parallel are known as a ‘battery’. Let’s move on, and explore how these fundamentals work.
How the Fundamental Battery Basics Work
Every battery cell comprises two electrodes that exchange ions through an electrolyte. The battery basics are universal although designs differ. The ions flow in opposite directions between the electrodes during charging and recharging. But this is only possible if the electrodes are able to flip polarities.
- When a cell is supplying power, its positive electrode is the cathode, and its negative one is the anode.
- During this phase, the negative electrode releases electrons that become electricity powering the external load.
- If a cell is receiving external power in order to recharge, its positive electrode becomes the anode and the negative one the cathode.
- However, not all batteries can withstand this process. Hence we have primary single-use, and secondary-use, rechargeable cells.
The ability, or not, of battery cells to recharge depends on the chemistry of their electrodes and electrolytes. Alkaline batteries are arguably the most popular single-use ones, while lead-acid and lithium batteries have become rechargeable industry stalwarts.
The Demand for Batteries Just Keeps Growing
The battery basics may vary widely in terms of chemistries, although the demand for energy storage keeps on growing. Lead-acid batteries were the original stalwarts, although they became too bulky for hand-held electronics. Two new, climate-driven requirements have rocketed volumes to previously unimagined heights.
The first of these growth points centers around electric vehicles, which are fundamental for decarbonizing transport. However, the demand for renewable energy-storage is perhaps even more pressing. Who could have imagined twenty-years ago, how important battery cells would have become?
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