🔋 DICR VERSUS TESLA HEAT PUMP 🔥

When I first joined the battery industry, I often find myself bumped into cool abbreviations like DCIR, and wonder what it means. Today I would like to talk briefly on this topic and use Tesla as an example

DCIR stands for Direct Current Internal Resistance; it is the counter-force of electrons when they move inside a battery cell. Like all natural phenomena, the faster you drive, the more wind resistance you will receive.  ‘

So, what contributes to this resistance ❓

1. Battery size – Bigger batteries tend to have more electrolyte and capacity density, so current will have to travel further and penetrate more layers of resistance to get from Tab A (Cathode) to Tab B (Anode) for example.
2. Electrolyte and Polarization Resistance – Battery is not a perfect current source, the electrolyte inside the battery automatically creates ionic resistance in diffusion, also known as Ohmic resistance. Research shows the resistance can be relieved if better conductive electrodes were used, however, the resistance traits will still remain.

Tesla Heat Pump VS DCIR 🔋🔥

Due to Cell chemistry, researchers found that as the temperature of the battery cells increases, their DCIR drops significantly, which will allow faster charging and longer discharging.

To take advantage of this, Tesla engineered a HEAT PUMP system on its Model Y, with a brilliant design to absorb, compress, and heat air from the atmosphere, then use it to pre-heat the battery cells to optimum working temperature in a very cost-effective way!