Meet the new 21700 battery

New products keep coming onto the market, and one of them is the new INR21700-50E battery cell. The 18650 cell, by now almost traditional and known everywhere, is still widely used and praised. The new INR21700-50E cell adds a good deal to what is possible.

KWS Seuren works with Samsung cells, so we can offer this new battery cell too. We are glad to, because the new INR21700-50E cell has some clear advantages over the 18650 cell.

We expect a battery cell to deliver power, and this one does. At 4,900 mAh, the standard discharge capacity of the new INR21700-50E is considerably higher than that of the familiar 18650 cell, which stops at 3,350 mAh. After using a battery, people on the move want to get going again quickly, taking as much energy as possible with them in as little time as possible. Here too the comparison between the two cells comes out in favour of the new INR21700-50E. The 18650 cell has a standard charge current of 1,700 mA; the 21700 beats that with 2,450 mA.

Some applications ask that little bit extra of a battery, and there too the newcomer holds its own against its older brother. Where the maximum continuous discharge current of the 18650 stops at 8,000 mA, the 21700 manages to deliver 9,800 mA, and in short peaks it can even reach 14,700 mA.

In short, a development that can only make batteries easier to use. At KWS Seuren we fit these cells in e-bike batteries, so you notice the difference in range and charging time. KWS Seuren

Electrodes: The battery contains two electrodes: a positive one (the cathode, often made of lithium metal oxide) and a negative one (the anode, usually made of graphite).

Electrolyte: Between the electrodes is an electrolyte containing lithium ions, which allows these ions to move.

Charging: During charging, lithium ions move from the cathode to the anode, a process called intercalation.

Use/discharging: During use the ions move from the anode to the cathode, while an electric current flows through an external circuit.

Recharging: When a voltage is applied in the opposite direction, the ions move back to the anode. This process is reversible and repeatable.