Power Supply System Adaptive Charge Discharge Allocation
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Solution Overview
Problem
Existing power supply systems for electric vehicles connected in parallel face challenges in managing charge and discharge power allocation, leading to instability and inefficiency due to exceeding upper limit powers, resulting in reduced performance and potential battery deterioration.
Innovation Solution
A power supply system with a control unit that acquires target powers and residual capacities of storage devices, allocates charge/discharge powers based on these, and reallocates when upper limits are exceeded to ensure each device operates within its capacity, preventing overcharging or over-discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charge/discharge power is allocated based on SOC rates without considering upper limit powers, then power supply efficiency is improved, but system reliability deteriorates due to exceeding battery capacity limits
Solution Approach 1:
The patent applies dynamics by making the power allocation method adaptive and changeable. The control unit dynamically switches between SOC-rate-based allocation (for efficiency) and upper-limit-based allocation (for reliability) depending on real-time battery states. This dynamic adjustment resolves the contradiction by allowing the system to optimize for efficiency when limits are not approached, and switch to limit-based allocation when reliability concerns arise.
Solution Approach 2:
The patent implements feedback by continuously monitoring the SOC and upper limit power of each battery, then using this information to adjust power allocation in real-time. The control unit receives feedback from battery status and modifies the allocation strategy accordingly, preventing limit violations while maintaining efficiency. This closed-loop control resolves the contradiction by ensuring reliability constraints are met without permanently sacrificing efficiency.
2Device complexity
If power is allocated equally among storage devices, then device complexity is reduced, but power supply stability deteriorates due to unequal discharge durations
Solution Approach 1:
The patent applies local quality by recognizing that each battery has different characteristics (SOC, capacity, upper limits) and allocating power accordingly rather than applying a uniform allocation rule. The control unit tailors the power allocation to the specific state of each battery, ensuring that batteries with higher SOC or capacity contribute more to the power supply. This resolves the contradiction by maintaining stability through differentiated allocation while keeping control logic relatively simple.
3Reliability
If upper limit power constraints are strictly enforced, then battery protection is improved, but power supply capability deteriorates due to reduced available power
Solution Approach 1:
The patent applies partial or excessive action by allowing power allocation to temporarily exceed individual battery upper limits based on SOC rates, while implementing corrective measures when limits are approached. The system can allocate more power to batteries that can handle it (based on SOC) while others contribute less, and then rebalances when necessary. This resolves the contradiction by maximizing power supply capability within acceptable safety margins, protecting batteries without unnecessarily limiting overall power output.
Data Source
AI summary
A power supply system is provided. For storage devices, upper limit powers are determined. A control unit includes a target power acquiring section which acquires power requested by an object or power supplied by a charging apparatus as target power of charge/discharge performed by storage devices. A residual capacity acquiring section acquires residual capacities of the storage devices. A first target power allocating section allocates the target power to the storage devices as charge/discharge powers based on the residual capacities. A determining section determines whether or not the allocated charge/discharge powers exceed the upper limit powers of the storage devices. A second target power allocating section reallocates the target power to the storage devices so that the allocated charge/discharge powers do not exceed the upper limit powers, when the determining section determines that any of the charge/discharge powers has exceeded the upper limit power of the related storage device.