Why do home battery systems aging?

Most days, home battery systems store more energy than is consumed. As a result, the storage systems are cycled at high SOC ranges of 50 to 100 percent, which causes increased aging. To reduce the aging, system settings should delay charging the batteries until later in the day.

How does cyclic aging affect battery life?

Cyclic aging is dominated by the energy throughput – the amount of energy that moves through the battery in a specific period of time – so the number of cycles plays a key role. However, small cycles are less harmful than big ones, as shown in Figure 4 (below).

How complex is battery aging?

Battery aging is very complex, non-linear and influenced by many parameters. It can be observed for example, that batteries age even if they are not used. But, in general, batteries age faster if they are used. To manage the complexity, it is common practice to split aging into three buckets: calendric, cyclic, and reversible aging:

Why do EV batteries lose capacity when they age?

Batteries lose capacity when they age. For an electric vehicle, losing capacity means the EV cannot drive as far as it used to without stopping for a recharge. And for stationary energy storage, it means the battery can store less energy and thus generate less revenue.

Why does charging a battery increase aging?

One reason is that charging a battery with high power raises the temperature, which leads to accelerated aging. Another reason is the increased risk of lithium plating. Besides temperature, charging power, throughput, and depth of discharge, other effects such as phase shifts also accelerate battery aging.

Do batteries age faster if they are used?

But, in general, batteries age faster if they are used. To manage the complexity, it is common practice to split aging into three buckets: calendric, cyclic, and reversible aging: Calendric aging – The gradual degradation of batteries over time, even if they are not used.