Booster Unit for High-C Rate Lithium-Ion Battery Charging
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Solution Overview
Problem
Lithium ion batteries face limitations in charging rates, as existing technologies are unable to efficiently provide high-C charging currents over a wide range of state of charge, leading to longer charging durations and reduced performance.
Innovation Solution
A charging system comprising a main charging unit and a booster unit that provides high-C charging currents of at least 4 C to 10 C over 10-70% SoC for battery cells with metalloid-based anodes, such as Si, Ge, and Sn-based materials, along with a user interface for customizable charging preferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charging methods are used for lithium ion batteries, then battery safety is maintained, but charging duration is excessive and charging rate is limited
Solution Approach 1:
The charging process is segmented into two distinct phases: a first charging phase using conventional current rates for safety, and a second charging phase using elevated current rates for speed. This segmentation allows the system to achieve fast charging without compromising battery safety by controlling the transition between phases based on state-of-charge thresholds.
Solution Approach 2:
The charging system dynamically adjusts the charging current rate based on the battery's state of charge. The system transitions from a first charging current rate to a second, higher charging current rate when the battery reaches a predetermined state-of-charge threshold, optimizing both safety and charging speed throughout the charging process.
2Productivity
If high charging currents are applied to extend the charging range, then charging speed improves, but battery health and safety are compromised
Solution Approach 1:
The system changes the charging current parameter based on the battery's state of charge. By elevating the charging current rate only after reaching a predetermined threshold and maintaining it within a controlled range, the system achieves faster charging speeds while preventing damage that would occur with continuously high current application.
Solution Approach 2:
The charging system dynamically adjusts the current rate based on real-time battery status. The transition from first to second charging phase is controlled by monitoring the state of charge, ensuring that high current is applied only when safe, thus maintaining battery health while improving charging speed.
3Productivity
If charging current is increased to at least 4C over 10-70% SoC range, then charging efficiency improves, but system complexity increases due to booster unit
Solution Approach 1:
A booster unit is introduced as an intermediary component to enable high-C charging currents. The booster unit works in conjunction with the main charging unit, activating only during the second charging phase when high current is needed, thus achieving improved charging efficiency while minimizing the impact on system complexity through selective operation.
Solution Approach 2:
The charging system is segmented into a main charging unit for the first phase and a booster unit for the second phase. This segmentation allows the booster unit to be optimized specifically for high-current delivery without needing to handle the entire charging process, reducing overall system complexity while achieving high charging efficiency during the critical second phase.
Data Source
AI summary
Charging systems and methods are provided, which increase charging currents and reduce charging durations for battery cells with metalloid-based anodes that enable high C-rate (charging rate) charging. Specifically, methods comprise charging battery cells having metalloid-based anodes having Si, Ge and/or Sn-based anode active material, by providing a high-C charging current of at least 4 C (or 5 C, or 10 C or more) over a range of at least 10-70% SoC (state of charge) of the battery cells. Charging systems comprise a booster unit configured to provide a high-C charging current over at least most of the SoC range of battery cells having metalloid-based anodes in the at least one battery unit. Charging systems further comprise a user interface configured to receive user preferences concerning a specified charging duration and/or a specified target SoC—for implementation by the charging system.