eVTOL Battery Pack Power Distribution for State Variation Control
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Solution Overview
Problem
Electric aircraft experience variations in battery state, such as SOC and temperature, particularly during high output operations like takeoff and landing, leading to potential battery abnormalities and safety risks.
Innovation Solution
A controller that acquires battery information and executes power distribution control to reduce state variations among unit batteries, excluding a predetermined period immediately following takeoff to cruising, thereby suppressing battery abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power distribution control is executed during the predetermined period immediately following transition from takeoff to cruising, then battery state variation can be suppressed, but measurement precision of battery state deteriorates due to bias in ion concentration and temperature
Solution Approach 1:
The control device determines to suspend power distribution control during the predetermined period immediately following transition from takeoff to cruising operation. This preliminary suspension prevents erroneous control actions based on inaccurate battery state measurements, and allows the battery system to stabilize before resuming control
Solution Approach 2:
The power distribution control is dynamically adjusted based on the operational phase of the electric flight vehicle. The control device activates or suspends power distribution control according to whether the vehicle is in the predetermined period after takeoff transition or in other operational periods, optimizing control effectiveness while avoiding measurement errors
2Power
If high output is supplied during takeoff and landing operations, then flight performance is improved, but battery state variation increases leading to abnormality risk
Solution Approach 1:
The control device applies differentiated power distribution to individual battery packs based on their specific states. By acquiring battery information from each battery pack and determining power distribution individually, the system addresses local variations in battery state while maintaining high overall output power during takeoff and landing operations
Solution Approach 2:
The control device dynamically adjusts power distribution parameters based on real-time battery state information. By changing power distribution ratios according to battery temperature, charge level, and other parameters, the system maintains high output power while suppressing excessive state variation among battery packs
Data Source
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AI summary
A controller (50) controls power supplied from a battery (14) to an EPU (15) that drives a rotary wing (13) in an eVTOL. The controller includes an acquisition unit (51) that acquires battery information indicating states of battery packs (141) that are unit batteries included in the battery, and a control unit (52) that executes control based on the battery information. The control unit controls power distribution of the battery packs based on the battery information to reduce variation in state among the battery packs during at least a portion of an operation period excluding a predetermined period immediately following transition from takeoff operation to cruising operation.