Dual-Battery Charging Control for Deteriorated HV Charge Characteristics
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Solution Overview
Problem
The charging rate characteristic of high-voltage batteries can change due to deterioration, leading to insufficient storage of electricity despite reaching a predetermined charging rate, and existing systems fail to account for these changes effectively.
Innovation Solution
A battery system with a processing circuit that determines the state of low-voltage and high-voltage batteries to control charging, setting a predetermined electricity amount based on battery conditions, using a bidirectional DC-DC converter to manage voltage and prevent overcharging, and implementing a lower limit guard to maintain battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If charging is performed until a predetermined charging rate is reached, then charging speed is improved, but the amount of electricity stored may be insufficient when charging rate characteristic changes due to deterioration
Solution Approach 1:
The patent applies dynamics by making the charging control strategy adaptive rather than fixed. The control circuit dynamically adjusts charging parameters based on real-time detection of charging rate characteristics. When deterioration is detected, the system transitions from a fixed charging rate target to a flexible control approach that considers both charging rate and stored electricity amount, allowing the charging process to adapt to changing battery conditions.
Solution Approach 2:
The patent implements feedback by continuously monitoring the charging rate characteristic and using this information to adjust charging control. The control circuit detects changes in charging rate characteristic and feeds this information back to modify the charging strategy, ensuring that both charging speed and electricity storage requirements are met despite battery deterioration.
2Quantity of substance
If the high-voltage battery is charged with a large amount of electricity from the low-voltage battery, then electricity storage is improved, but the voltage of the low-voltage battery may fall below the lower limit guard
Solution Approach 1:
The patent applies partial action by controlling the charging process to transfer only a determined amount of electricity from the low-voltage battery to the high-voltage battery, rather than charging until complete depletion. The control circuit calculates an appropriate charging amount that achieves sufficient electricity storage in the high-voltage battery while maintaining the low-voltage battery voltage above the lower limit guard, preventing overcharging.
Solution Approach 2:
The patent uses parameter changes by adjusting charging parameters (such as charging amount and rate) based on the detected state of both batteries. The control circuit modifies charging parameters to balance electricity transfer needs with low-voltage battery voltage maintenance, ensuring reliable operation of both batteries.
3Device complexity
If charging control is performed without considering charging rate characteristic changes, then device complexity is reduced, but measurement precision of battery state deteriorates
Solution Approach 1:
The patent introduces an intermediary function by adding a control circuit that acts as a mediator between the simple charging connection and the complex battery management requirements. This control circuit detects charging rate characteristics and implements appropriate control strategies, providing accurate battery state assessment without requiring complex overall system architecture.
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
Ensures sufficient electricity storage in high-voltage batteries by adapting to changing charging rate characteristics, preventing overcharging, and maintaining battery health through state-based control, thereby stabilizing battery operation and reducing the risk of circuit malfunctions.
Implementation Method 1
The processing circuit may be configured to boost a voltage of direct current electric power output from the low-voltage battery to charge the high-voltage battery from the low-voltage battery
Data Source
AI summary
A battery system includes a low-voltage battery, a high-voltage battery having a higher rated voltage than the low-voltage battery, and a processing circuit configured to control charging of the high-voltage battery from the low-voltage battery. The processing circuit is configured to execute determining whether a stored electricity amount of the low-voltage battery is greater than a determination stored electricity amount, and controlling charging of the high-voltage battery such that the high-voltage battery is charged with a predetermined amount of electricity from the low-voltage battery on condition that the processing circuit determines that the stored electricity amount of the low-voltage battery is greater than the determination stored electricity amount.