Battery Module Monitoring with Pre-Sent Current Synchronization
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Solution Overview
Problem
Existing battery monitoring systems face challenges in maintaining synchronization between voltage and current value detection times, leading to reduced accuracy in calculating the state of charge of battery cells, which can result in rapid deterioration.
Innovation Solution
A battery monitoring system that uses a current sensor and satellite units with isolators to cable-connect and wirelessly transmit data, ensuring synchronous detection and calculation of voltage and current values, thereby maintaining accurate state of charge calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wireless communication is used to transmit voltage values from battery cell managers, then wiring space is reduced, but synchronization between voltage and current detection times deteriorates
Solution Approach 1:
The battery manager transmits current values to battery cell managers in advance before voltage measurement. This preliminary transmission ensures that current values are ready and synchronized with the voltage measurements that will be taken subsequently, eliminating synchronization errors without requiring extensive wiring revisions.
Solution Approach 2:
The system uses a feedback mechanism where battery cell managers transmit voltage values wirelessly to the battery manager, which then uses these values along with previously transmitted current values to calculate state of charge. The system can retry communication if needed, ensuring accurate data collection while maintaining wireless architecture.
2Reliability
If wireless communication retry is implemented, then communication reliability is improved, but detection time synchronization deteriorates
Solution Approach 1:
Current values are transmitted to battery cell managers before voltage measurement begins. This preliminary action ensures that even if voltage measurement requires communication retries, the current value remains valid and synchronized with the eventual voltage reading.
Solution Approach 2:
The system implements periodic communication cycles where current values are transmitted at regular intervals before voltage measurements. This periodic structure allows for systematic retry mechanisms without disrupting the overall synchronization framework.
Data Source
AI summary
In a battery monitoring system including a plurality of battery modules each including one or more cells, the battery modules are connected in series to each other. The battery monitoring system monitors the state of each cell based on the voltage value of the cell and the current value of the battery modules. A current detection unit detects the current value. Each voltage detection unit is associated with the corresponding one of the battery modules and detects the voltage value. Each slave unit is associated with the corresponding one of the battery modules, and wirelessly transmits information including synchronous current and voltage values detected by the current detection unit and the voltage detection unit. A master unit receives the information transmitted from the slave units. A central monitoring unit receives the information received by the master unit.