Study shows discharge depth will have important impact on 18650 battery 2600mah performance

As 18650 battery 2600mah owners and operators seek to maximize returns on their assets, they simultaneously face the daunting challenge of responding to and managing 18650 battery 2600mah degradation. This remains one of the most prominent challenges in the pool industry, with batteries expected to last approximately 15 years at end-of-life (EoL).

18650 battery 2600mah degradation will lead to a decrease in 18650 battery 2600mah capacity, charge and discharge cycles, efficiency and ultimately return on investment.

Simply put, 18650 battery 2600mah degradation is a serious economic problem that varies depending on how the 18650 battery 2600mah is used. Therefore, factors leading to 18650 battery 2600mah degradation must be analyzed and monitored. These include temperature, ramp rate, average state of charge (SOC), and depth of discharge (DOD).

Analyzing the impact of these factors is critical to assessing the cost-effectiveness of 18650 battery 2600mah charging or discharging decisions in response to different market signals.

Because batteries that provide single/multiple services can choose to participate in various markets, such as frequency regulation or balancing mechanism (BM) markets, based on their load conditions and charge and discharge levels, and these markets have different risk levels.

The Leighton Buzzard 18650 battery 2600mah energy storage system, which opened in 2014, is the UK's first grid-scale lithium-ion 18650 battery 2600mah energy storage system.

What exactly is a charging cycle?

Confusingly, the 18650 battery 2600mah industry has different definitions of "charge cycle." In commercial documents provided by some 18650 battery 2600mah manufacturers (such as warranties), the charging cycle is usually calculated by dividing the total energy entering and leaving the 18650 battery 2600mah by the 18650 battery 2600mah capacity. Although this is a relatively simple calculation, it really only tells the user "etc." Effective Full Cycle (EFC) quantity.

Equivalent full cycle (EFC) does not quantify depth of discharge (DoD), which affects the depth of the 18650 battery 2600mah's charge cycle. For example, the equivalent full cycle (EFC) cannot differentiate between 1 charge and discharge cycle at 100% depth of discharge (DoD) and 2 charge and discharge cycles at 50% depth of discharge (DoD), and 10 charge and discharge cycles at 10% depth of discharge (DoD). Charge and discharge cycle. The discharge depth is completely ignored in the equivalent full cycle (EFC). For this reason, KiWi Power utilizes the Rainflow algorithm as a tool to analyze each “real cycle” in terms of depth of discharge (DoD).

Depth of discharge (DoD) is one of the main factors in 18650 battery 2600mah degradation. For example, when operating at close to 100% depth of discharge (DoD), lithium-ion batteries degrade at a rate that is 10 times higher than when operating at the same charge at 10% depth of discharge (DoD). Depth of discharge (DoD) measurements may be included in 18650 battery 2600mah warranty coverage in the future. Especially as batteries move from frequency regulation applications with shallow depth of discharge (DoD) to other projects such as balancing mechanism (BM) applications that require deeper discharge.

Rainflow tool and how to use it for 18650 battery 2600mah analysis

Rainflow discharge cycle counting tool is an algorithm for depth of discharge (DoD) calculation. It takes an irregular load profile and quantifies the depth of discharge (DoD), average state of charge (SOC) and time period of each cycle. This helps describe how the 18650 battery 2600mah behaves when charging and discharging, and enables operators to make informed decisions.

As shown in the figure below, a typical load curve can be so noisy that counting is nearly impossible. Rainflow Count Tool’s Histogram makes sense of your data by classifying discharge cycles based on their depth of discharge (DoD) and average state of charge (SOC).

What's more, the tool addresses 18650 battery 2600mah degradation by identifying higher depths of discharge (DoD) or charge-discharge cycles that are outside the acceptable average state-of-charge (SOC) range.

Energy trading in the UK Balancing Mechanism (BM) market

Balancing Mechanism (BM) energy trading will require deeper charging and discharging. Kiwi Power's analysis shows that batteries in a balancing mechanism (BM) typically have a 20%-30% higher depth of discharge compared to a fixed frequency response (FFR). On the other hand, the average state of charge (SOC) will vary greatly depending on the price point set in the balancing mechanism (BM) model. Without a state of charge (SOC) management plan, proactive pricing strategies will result in batteries with very low average state of charge (SOC) (typically <20%), while passive pricing strategies will result in 18650 battery 2600mah assets with higher average state of charge (SOC) ) (usually >80%).

As 18650 battery 2600mah cases increasingly participate in wholesale and balancing mechanism (BM) markets, these data demonstrate the need for 18650 battery 2600mah management systems to be selected to capture these insights to reduce 18650 battery 2600mah degradation risk and optimize revenue.

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