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How does the EGO Power + 56V ARC Lithium™ battery manage heat?
Our patented 56V ARC Lithium™ technology is designed like no other battery. Our unique battery maximises cooling in three ways
1. How we manage heat mechanically
Rather than conventional “brick shaped” batteries where the cells are packed together, overheat and shut down, our unique Arc design maximises surface area and so dissipates heat more effectively.
2. How we manage heat chemically
Actively absorbing heat with Keep Cool™ Technology
Each and every cell is surrounded by our unique Keep Cool™ phase change material (PCM) that absorbs heat energy and keeps individual cells at their optimum temperature for longer, while increasing battery life.
KeepCool™ Technology is featured in 1P and 2P EGO battery products: this includes BA1400, BA1400T, BA2800, BA2800T and BA2242T. For EGO batteries that contain more cells (3P and 4P batteries), the operating load is spread more, so there is no need to include the KeepCool™ phase change material layer.
**How the phase change material ( PCM) works in our batteries:
When a material goes from a high energy state to a low energy state, it releases energy. For example, liquid water loses energy when it becomes solid ice. And the reverse is true — solid ice gains energy to become liquid water.
When a material is changing state from solid to liquid, the energy applied goes towards changing the state of the material, rather than heating up the battery cell.
That’s how our PCMs work. Our PCM begins absorbing heat as a solid. However, unlike traditional heat storage materials, when the PCM reaches its melting temperature, it absorbs large amounts of energy at an almost constant temperature until all the material is transformed into liquid.
The more heat the PCM absorbs from the battery, the moreheat the battery can generate without overheating. This helps to maximise run time.
When the battery is not in use, the PCM cools down by safely transferring heat to the atmosphere and turning back into a solid.
3. How we manage heat electronically
Individually monitoring each cell
Most competitor battery packs have one or two sensors to monitor the battery’s temperature. Normally they’re located on the cells that are most likely to be hottest and some have even been known to locate them by the coolest cells. But cells can change after several charge cycles. This means the sensors may not be monitoring the hottest cells anymore.
That’s why we decided one or two sensors just wasn’t enough.
For example, we engineered 28 sensors to monitor the
temperature of all cells (on our 2P battery). The sensors are controlled via the EGO Battery Management System
(see “How does EGO ensure the most versatile performance?” on page 34 for more information)
Ensuring safety prolongs the battery lifetime
If there are only one or two cells being monitored within a battery pack, it is possible that the hottest cell is not immediately identified. If the battery safety system does not shut down the battery pack when an individual cell is overheating it could become damaged beyond repair rendering the entire pack useless. This could also represent a potential safety hazard.
In EGO batteries, because every cell is monitored, when a specific overheating cell is identified, the entire battery will shut down until it cools down to within the optimum operating parameters. This ensures safe use and provides extended battery life