Rechargeable Coin Cells of Higher Energy Density and How

Grepow coin cell structure of higher capacity

With the continuous development of related technologies on power supply, the endurance of ordinary button cells can no longer satisfy the consumers. Nowadays, besides the safety of button batteries, people are also paying more and more attention to the endurance of button batteries. To improve the button-cell battery life and running time, technicians focus on the energy density of button batteries and high-energy-density ones were launched.

Energy density refers to the amount of energy stored in a unit of space or mass matter. The energy density of a battery is the electrical energy released by the average unit volume or mass of the battery. The energy density of the battery is generally divided into two dimensions: weight energy density and volume energy density. So how should people increase the energy density of the battery? Here are three basic ways.

The ways of increasing the capacity of a battery

Upgrade the cathode material

The energy density of the battery is controlled by the positive and negative electrodes of the battery. Since the energy density of the current negative electrode material is much greater than that of the positive electrode, improving the energy density of the entire battery cell requires the continuous upgrading of the positive electrode material.

Increase the size of the battery

Battery manufacturers can increase the size of the primary battery to achieve the effect of expansion. But increasing the battery cell will increase the volume of the battery, which may cause the battery model to not match.

Optimize the composition and structure of the battery

Button cell Explosive diagram
Grepow Button cell structure

The use of thinner aluminum-plastic film and thinner battery separator can make the battery in a limited volume to reduce the capacity of the aluminum-plastic film, separator, etc. volume, increase the chemicals that can be provided, thereby increasing the capacity of the battery cell.

Advanced technology


Grepow latest Button cell GRP1254
GRP1254-Grepow coin cell

Of course, battery companies must have fairly advanced technology to increase the energy density of batteries while ensuring safety. Grepow is such a company that focuses on small rechargeable lithium batteries. Grepow’s latest GRP1254 lithium-ion steel-shell coin cell battery can help TWS headphones, smart car keys,  and other consumer electronics increase endurance, extend service life, improve battery capacity and working voltage under the premise of ensuring safety, and increase battery energy density by 30% compared with the previous two generations. This can not only improve the endurance of the lithium button battery but also ensure the compact appearance of the button battery.

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