Power Reception Priority Control for Battery Charge Balancing

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Solution Overview

Problem

Existing power reception control methods do not account for user demands when distributing electric power among power storage elements, leading to inefficiencies in sharing power and leveling the state of charge across these elements.

Innovation Solution

A power reception control method that calculates a degree of priority for each power storage element based on user demands, such as remaining time or target state of charge, to adjust the differential electric power received, ensuring suitable power sharing and state of charge leveling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If differential electric power is shared equally among power storage elements, then the control system is simple, but user demands are not reflected in power distribution

Engineering Contradiction:
Improvecontrol system complexityVSAvoiduser demand adaptability
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent introduces a priority coefficient as a variable parameter that changes based on user demand. Each power storage element is assigned a priority coefficient reflecting user preferences (e.g., remaining time, target state of charge), and the differential electric power is distributed proportionally according to these coefficients. This transforms the equal-sharing control mechanism into an adaptive one that responds to user demands without requiring complex centralized control.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If power distribution ignores user demands, then the control mechanism is straightforward, but power sharing efficiency is reduced

Engineering Contradiction:
Improvecontrol mechanism simplicityVSAvoidpower sharing efficiency
Core Design Contradiction:
Ease of operationVSProductivity

Solution Approach 1:

Each power storage element independently calculates its own power reception amount by multiplying the differential electric power by its assigned priority coefficient. This self-service mechanism allows elements to autonomously adjust their power intake according to user demands without requiring complex inter-element coordination or centralized control, thereby maintaining operational simplicity while improving power sharing efficiency.

Inventive Principle:
Principle #25Self-service

3Device complexity

If equal power sharing is implemented, then control is uniform and simple, but state of charge leveling is insufficient

Engineering Contradiction:
Improvecontrol uniformityVSAvoidstate of charge leveling precision
Core Design Contradiction:
Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by allowing each power storage element to have its own priority coefficient that reflects its specific state and user demands. Elements with lower state of charge or higher user priority receive proportionally more power, creating a differentiated distribution pattern that effectively levels state of charge across elements while maintaining a relatively simple control framework.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS11843271B2Power reception control method for power storage element and power reception control device
Publication Date: 2023.12.12 NISSAN MOTOR CO LTD
  • US11843271B2 patent drawing
  • US11843271B2 patent drawing
  • US11843271B2 patent drawing

AI summary

A power reception control method for a power storage element controls element-receiving electric power received by the power storage element in an electric power system for supplying electric energy to a load group including plural power storage elements. The power reception control method acquires differential electric power by subtracting a current value of total transmitted electric power from a maximum value of the total transmitted electric power that is an available amount to be supplied to the entire load group via an electric power supply base point, calculates a degree of priority of the power storage element in accordance with a numerical value indicating a demand of a user, multiplies the differential electric power by the degree of priority to calculate element differential electric power, and adds the element differential electric power to the previous element-receiving electric power so as to update the element-receiving electric power.