Can you replace your EUC 18650 batteries with solid state versions?

[T-Ray]

I dont know if there are already solid state 18650 batteries in the market. But if there are, can they be used to replace the old LiIon versions?

Does the BMS still work? 

I have this fear that one day my KS-14D might burn. 

[The Brahan Seer]

Solid-State Batteries

Introduction to Solid-State Battery Technology

Solid-state batteries (SSBs) are an emerging and highly promising innovation in the relentless pursuit of advanced energy storage solutions. In contrast to traditional batteries, SSBs feature a radical departure in design, as they make use of solid electrolytes as opposed to the more common liquid or gel electrolytes found in conventional battery technologies like lithium-ion cells. This groundbreaking shift in the battery paradigm holds tremendous potential for significant advancements in multiple key aspects, encompassing energy density, safety, lifespan, and the operational temperature range.

In terms of energy density, solid electrolytes facilitate the utilization of lithium metal anodes, which boast a notably higher theoretical capacity when compared to the graphite anodes that are prevalent in lithium-ion batteries. Moreover, the utilization of solid electrolytes offers an inherent advantage in terms of safety, as they are non-flammable, effectively mitigating the substantial risk associated with thermal runaway, which is a primary concern in conventional battery technologies.

Furthermore, the benefits of solid-state batteries extend to the operational temperature range. The use of solid-state electrolytes enables a potentially wider spectrum of temperatures within which these batteries can function efficiently. This expanded operational temperature range opens up new possibilities for deploying these batteries in diverse environments and applications, making them an attractive option with a profound impact on the energy storage landscape.

BMS Considerations for Solid-State Batteries

Solid-state batteries, despite their promising potential, bring forth novel challenges and factors that necessitate a reevaluation of Battery Management System (BMS) design and operation. While the core principles of battery management, such as State of Charge (SoC) estimation, cell balancing, and safety protocols, remain pertinent, the methods for achieving these functions may undergo substantial variations.

For example, because solid-state batteries exhibit distinct charge and discharge behaviors in comparison to liquid-electrolyte batteries, it might be imperative to formulate new models for precise SoC estimation. Similarly, cell balancing strategies might require adjustments due to the distinct self-discharge rates and varying internal resistance characteristics inherent to solid-state cells. The introduction of solid-state batteries into the energy storage landscape prompts an evolution in BMS design and operation, calling for innovative solutions tailored to the unique characteristics of this groundbreaking technology.

The thermal management demands associated with solid-state batteries could indeed deviate significantly from traditional batteries. Although these batteries may boast a broader operational temperature range and a reduced risk of thermal runaway, they might also necessitate a distinct approach to managing their thermal behavior, particularly due to potentially higher operating temperatures.

Furthermore, solid-state batteries may exhibit different failure modes compared to their liquid-based counterparts. This divergence in failure modes calls for the development of new techniques for fault detection and diagnostics. Consequently, Battery Management Systems (BMSs) tailored for solid-state batteries must be equipped to monitor and react to these distinctive operational characteristics and failure scenarios, necessitating an evolution in their design and functionality.

 

Link: https://www.monolithicpower.com/jp/battery-management-systems/advanced-topics-in-bms/future-trends-in-bms

[Chriull]

57 minutes ago, T-Ray said:

I dont know if there are already solid state 18650 batteries in the market. But if there are, can they be used to replace the old LiIon versions?

As they are 

23 minutes ago, The Brahan Seer said:

an emerging and highly promising innovation

there is no viable replacement for li ion cells in EUCs.

57 minutes ago, T-Ray said:

I have this fear that one day my KS-14D might burn. 

The ks 14d is not really a wheel known for fires, but one can still regard some points to reduce the risk, like

monitor charging to recognise dead/detoriated cells causing imbalances or any other abnormalities.

Inspect the batteries after crashes to, at least visually exclude cell "deformations" 

Store the wheel or just the batteries outside (be careful in regard to humidity)

Don't burden the batteries once charge state gets lower.

Replace the batteries once abnormalities show up.