External Battery State Correction for Multi-Unit Charge Control
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Solution Overview
Problem
Conventional secondary battery management systems face challenges in accurately detecting and controlling the state of charge and capacity of secondary batteries across different manufacturers, leading to inefficiencies and increased costs due to independent internal management and varying correction algorithms.
Innovation Solution
A secondary battery management device that communicates with secondary battery units to request and receive voltage and state values, calculates corrections based on received data, and applies these corrections externally, allowing for unified management and control of state values across multiple battery units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If information representing the state of the secondary battery is managed independently inside each secondary battery unit, then each battery unit can operate autonomously, but accurate ascertainment of the battery state and appropriate control of charging and discharging cannot be achieved
Solution Approach 1:
The system divides management functions into two segments: basic state monitoring remains within each secondary battery unit (maintaining autonomy), while centralized state ascertainment and control management are performed by a separate management device (achieving accuracy). This segmentation allows each component to focus on specific tasks without overwhelming complexity.
Solution Approach 2:
A management device acts as an intermediary between multiple secondary battery units, collecting state information from various units, performing centralized analysis, and issuing control commands. This intermediary enables accurate cross-unit comparison and unified control without requiring direct complex interactions between all battery units.
2Adaptability or versatility
If different manufacturers use different information management methods and correction algorithms, then each manufacturer can optimize for their specific battery technology, but unified management and accurate state ascertainment across multiple manufacturers become difficult
Solution Approach 1:
The management device implements universal management capabilities that can handle state information from secondary battery units of different manufacturers. It performs standardized state ascertainment and control management functions that work across diverse battery technologies, while still allowing manufacturer-specific characteristics to be accommodated through the centralized management approach.
3Ease of operation
If high-performance processors are installed in each battery unit to enable accurate state management, then local decision-making capability is improved, but system cost increases
Solution Approach 1:
Complex control management functions and high-performance processing capabilities are extracted from individual secondary battery units and consolidated into a separate management device. This allows each battery unit to maintain simple, cost-effective hardware while the centralized management device handles sophisticated state ascertainment and control algorithms.
Data Source
AI summary
A secondary battery management device is communicably connected to a secondary battery unit including a secondary battery, and manages the secondary battery unit. The secondary battery management device is configured to: request the secondary battery unit to transmit a voltage and a state value of the secondary battery; receive the voltage and the state value of the secondary battery transmitted from the secondary battery unit; calculate a value of correction of the state value on the basis of the voltage and the state value which have been received; and transmit the calculated value of correction to the secondary battery unit in order to apply the calculated value of correction.