Dynamic Battery Switching for Load-Dependent Discharge Control
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Solution Overview
Problem
Battery packs with high-output and high-capacity secondary batteries connected in parallel face issues with heat generation and reduced cycle life due to excessive current flow between batteries at high load, leading to potential short circuits and reduced long-hour power supply capabilities.
Innovation Solution
A battery pack configuration with switch circuits and a controller that dynamically switches between high-output and high-capacity battery groups based on load current thresholds, ensuring independent discharge and charge management to balance capacity and prevent excessive current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-output battery and high-capacity battery are connected in parallel for high-load discharge, then high-load discharge capability is improved, but excessive current flows between batteries at end stage causing reduced reliability
Solution Approach 1:
The patent applies dynamic switching control where the controller monitors the state of charge of both batteries and dynamically switches between high-output battery and high-capacity battery based on real-time conditions. This prevents the high-capacity battery from being overcharged by the high-output battery at the end stage, thereby maintaining reliability while preserving high-load discharge capability.
Solution Approach 2:
The system changes operational parameters by switching between different battery configurations based on state of charge thresholds. When the high-output battery's charge drops below a threshold, the system switches to the high-capacity battery, preventing excessive current flow and voltage reversal that would damage the batteries.
2Productivity
If high-output battery is used for high-load discharge, then discharge rate is improved, but battery voltage becomes low at end stage causing charge reversal
Solution Approach 1:
The controller performs preliminary monitoring of the high-output battery's state of charge and proactively switches to the high-capacity battery before the voltage drops to dangerous levels. This prevents charge reversal and maintains stable power output throughout the discharge cycle.
Solution Approach 2:
The controller acts as an intermediary that manages power flow between the two battery types and the load. It monitors voltage levels and state of charge, switching between batteries to maintain stable output voltage and prevent the high-output battery from being recharged by the high-capacity battery.
3Duration of action of moving object
If high-capacity battery supplies power at high load, then long-hour power supply is improved, but heat generation increases reducing cycle life
Solution Approach 1:
The system dynamically adjusts which battery supplies power based on load conditions. During high-load periods, the high-output battery is used to minimize heat generation. During low-load or steady-state operation, the high-capacity battery supplies power to maximize duration. This dynamic allocation optimizes both heat management and power supply duration.
Data Source
AI summary
A battery pack includes a plurality of secondary batteries having different discharge characteristics; at least one switch configured to switch a secondary battery connected to a load among the secondary batteries; and a controller configured to control the switch.