Dual-Battery Charge Threshold Control to Limit Li-Ion Deterioration
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Solution Overview
Problem
Existing battery charging systems struggle to balance suppressing battery deterioration and ensuring appropriate charge amounts, particularly for lithium-ion batteries, which deteriorate quickly in high-voltage and high-temperature states, leading to inefficient power supply during vehicle operation.
Innovation Solution
A battery control system and method that includes a first battery, an electric power conversion unit, a second battery, a battery control unit, and a monitoring unit, which sets and maintains threshold values to control charging, preventing excessive charge levels during vehicle operation and performing auxiliary charging when the vehicle is not in use to maintain appropriate charge amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the second battery is charged to a high charge amount to ensure sufficient power supply, then the power supply capacity is improved, but the battery deterioration is accelerated
Solution Approach 1:
The patent implements dynamic charging threshold adjustment based on the operational state of the mobile body. When the mobile body is in operation, the charging threshold is set to a first threshold value that limits the charge amount to suppress deterioration. When the mobile body is not in operation, the threshold is raised to a second threshold value that allows higher charge amounts. This dynamic adjustment resolves the contradiction by adapting the charge limit to the current operational context.
Solution Approach 2:
The patent changes the charging parameter (threshold value) based on the operational state. The control unit switches between a first threshold value during operation and a second threshold value when not in operation. This parameter change allows the system to optimize between suppression of deterioration and ensuring sufficient charge, resolving the technical contradiction through conditional parameter adjustment.
2Reliability
If the charging threshold is limited to suppress battery deterioration, then the battery life is extended, but the charge amount becomes insufficient for activation and operation
Solution Approach 1:
The patent employs dynamic threshold adjustment where the charging limit is not fixed but changes based on operational state. During operation, a conservative first threshold suppresses deterioration. When the mobile body is parked or not in operation, the threshold increases to a second value that ensures sufficient charge for activation. This dynamic approach resolves the contradiction by allowing different charge levels appropriate to different operational contexts.
Solution Approach 2:
The patent performs preliminary charging to a higher second threshold value when the mobile body is not in operation, preparing sufficient charge in advance for when operation is needed. This preliminary action ensures that when the vehicle needs to be activated, there is adequate charge available, while during actual operation, the lower first threshold prevents deterioration. The advance preparation resolves the contradiction between limited charging and sufficient charge requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively suppresses battery deterioration and ensures adequate charge levels by controlling charging based on monitoring and operation states, allowing for efficient power supply and prolonged battery life.
Implementation Method 1
an electric power conversion unit that converts the electric power stored in the first battery to predetermined electric power
Data Source
AI summary
A battery control system includes a battery control unit that controls charging of a first battery and a second battery, and a charge amount monitoring unit that functions as a battery monitoring unit for monitoring charge amount of the first battery and the second battery. When a vehicle is carrying out a predetermined operation, the battery control unit charges the second battery so that the charge amount of the second battery does not exceed a first threshold value for suppressing battery deterioration, based on a monitoring result of the charge amount monitoring unit. When the vehicle ends the predetermined operation, the battery control unit carries out primary auxiliary charging for charging the second battery up to a second threshold value that is higher than the first threshold value.