Li-Ion Battery Charging System for Range-Life Trade-off
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Solution Overview
Problem
The service life of Li-ion batteries in electric vehicles is shortened due to deep charging and discharging cycles, leading to high warranty costs and limited battery technology options, as they typically last around 1500 full cycles, making it difficult to achieve a 10-year lifespan.
Innovation Solution
An energy storage charging system that monitors and manages the charging behavior of vehicle batteries, recommending optimal charging practices to extend their service life by limiting the depth of charge and discharge cycles, selecting suitable charging stations, and controlling the charging process to avoid full charge states, thereby reducing aging and increasing battery durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the entire energy content of the drive battery is used to achieve maximum range, then the vehicle range is improved, but the service life of the battery decreases significantly
Solution Approach 1:
The system intentionally limits the depth of discharge to below 80% and maintains state of charge between 20-80% rather than fully utilizing the battery capacity. This partial action approach sacrifices some range potential to dramatically extend battery service life, avoiding the harmful effects of deep cycling and extreme charge states
2Use of energy by moving object
If deep charging and discharging cycles are performed, then the energy capacity is fully utilized, but the number of charge cycles the battery can withstand decreases to around 1500 cycles
Solution Approach 1:
The system changes the operating parameters of the battery by maintaining state of charge within 20-80% and limiting depth of discharge to below 80%. This parameter optimization reduces stress on the battery cells, extending the number of usable charge cycles well beyond the typical 1500 cycles associated with deep cycling
3Use of energy by moving object
If the battery is kept in a fully charged state, then the energy availability is maximized, but the service life of the battery decreases due to negative effects on cell longevity
Solution Approach 1:
The system performs preliminary charging actions to reach the optimal state of charge range (20-80%) before the battery is fully discharged, rather than allowing it to deplete completely. This proactive management ensures energy availability is maintained within safe limits, preventing the harmful effects of prolonged full charge states on battery longevity
Data Source
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AI summary
The invention relates to an energy accumulator charging system for a vehicle. Said energy accumulator charging system is designed to at least extend the service life of at least one vehicle energy accumulator, in particular a Li-ion battery.