Decentralized Battery Charge Balancing Storage
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Solution Overview
Problem
Existing battery management systems for electric vehicles lack efficient decentralized storage and analysis of charge state balancing information, particularly regarding temperature changes and usage of charge state balancing resistors, which affects the service life and reliability of battery systems.
Innovation Solution
Implementing a method where sensor control devices store information about implemented charge state balancing in nonvolatile memories, allowing for autonomous management and analysis without relying on the primary control device, and transmitting this information at the end of a driving cycle or during communication, enabling comprehensive overview and delayed system start prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If charge state balancing information is stored centrally in the primary control device, then system complexity is reduced, but reliability and service life monitoring capability deteriorate due to single point of failure and loss of decentralized data
Solution Approach 1:
The patent segments the battery management system into a primary control device and multiple sensor control devices, each with independent non-volatile memory. Charge state balancing information is decentralized across these sensor control devices rather than centralized in the primary control device, eliminating single points of failure and improving system reliability.
Solution Approach 2:
Each sensor control device is equipped with local non-volatile memory to store charge state balancing information specific to its associated battery module. This local storage capability allows each component to maintain its own operational history independently, enhancing both reliability and diagnostic capability.
2Reliability
If charge state balancing information is stored in nonvolatile memories of sensor control devices, then service life and reliability monitoring is improved, but device complexity increases due to additional memory components and decentralized architecture
Solution Approach 1:
The sensor control devices are pre-equipped with non-volatile memory during manufacturing, enabling them to autonomously store charge state balancing information from the first operation. This preliminary preparation eliminates the need for complex data transfer mechanisms and simplifies the overall system architecture despite the decentralized structure.
Solution Approach 2:
Each sensor control device independently manages its own charge state balancing information storage and retrieval without requiring constant intervention from the primary control device. This self-service capability reduces the communication overhead and simplifies the control architecture while maintaining high reliability.
3Productivity
If charge state balancing is performed frequently to maintain battery cell balance, then battery performance is improved, but service life of charge state balancing resistors deteriorates due to increased temperature changes and usage
Solution Approach 1:
The system implements feedback by continuously monitoring charge state balancing information including temperature changes and usage duration in non-volatile memory. This feedback mechanism enables the primary control device to analyze the service life status of charge state balancing resistors and adjust balancing operations to prevent excessive wear while maintaining battery performance.
Solution Approach 2:
Instead of performing charge state balancing at maximum frequency, the system uses partial action by conducting balancing operations only when necessary based on monitored conditions. The non-volatile memory stores usage information that allows the system to determine when balancing is needed, avoiding unnecessary operations that would accelerate resistor degradation.
4Ease of repair
If battery module removal is simplified for maintenance, then ease of repair is improved, but information accessibility deteriorates without decentralized storage capability
Solution Approach 1:
The system segments charge state balancing information storage to each sensor control device associated with its battery module. This segmentation allows a battery module to be removed and transferred to another system without losing its operational history, as the information is stored locally in the sensor control device's non-volatile memory rather than being tied to a specific system.
Solution Approach 2:
The non-volatile memory in each sensor control device creates a portable copy of charge state balancing information that travels with the battery module. This copying mechanism ensures that diagnostic and service life information is preserved during module removal and replacement, maintaining information accessibility while simplifying maintenance procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for effective management of charge state balancing information, reducing the need for primary control device involvement, enhancing the analysis of charge state balancing usage, and ensuring accurate diagnosis and maintenance of battery systems, thus improving the service life and reliability of battery systems.
Implementation Method 1
Each connection of a charge state balancing resistor results in heating of the same after only a short period
Data Source
AI summary
The disclosure relates to a method for the battery management of a battery which comprises a plurality of battery cells and which is fitted with a battery management system for monitoring battery functionality and with a charge state compensation system, wherein the battery management system comprises a plurality of sensor control devices and a main control device, said control devices being connected with one another via a communication channel, and wherein the charge state compensation system has a number of charge state compensation resistors being put into operation via the sensor control devices for a charge state compensation of battery cells. The sensor control devices save information about performed charge state compensations in non-volatile memory. A computer program, a battery management system, a battery system and a motor vehicle, which are designed to carry out the method, are also described.