Battery Management System Limit Value Determination
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Solution Overview
Problem
Existing battery management systems lack efficient methods to determine and enforce charging and discharging limits for batteries, leading to potential overvoltage, undervoltage, and premature aging due to the lack of real-time monitoring and adaptive control of battery state variables.
Innovation Solution
A method for determining and storing limit values for battery management systems based on characteristic variables such as state of charge, power, and temperature, allowing for real-time adjustment of charging and discharging operations to prevent battery voltage and temperature extremes, using a memory-based association of limit values with predetermined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging and discharging operations are performed without real-time monitoring of battery state variables, then operational simplicity is maintained, but battery voltage and temperature extremes occur leading to premature aging
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing charging and discharging limit values in a memory device for different states of charge and temperature conditions. During operation, the system simply retrieves the appropriate pre-determined limits based on current battery state, avoiding the need for complex real-time calculations while ensuring reliable battery protection against voltage and temperature extremes
Solution Approach 2:
The battery management system applies self-service by automatically monitoring its own state variables (state of charge, temperature) and comparing them against stored limit values to control charging and discharging operations. The system manages itself without requiring external intervention, adjusting power limits based on real-time battery conditions to prevent premature aging
2Reliability
If adaptive control of battery state variables is implemented in real-time, then battery aging is prevented and battery life is extended, but computational requirements and system complexity increase
Solution Approach 1:
The patent resolves this contradiction by performing the complex computational work in advance - calculating charging and discharging power limits for various battery states and storing them in a memory device. During real-time operation, the automated system simply retrieves pre-computed values based on current state of charge and temperature, maintaining high levels of automation and safety without requiring complex real-time computations
Solution Approach 2:
The system applies dynamics by continuously adapting the charging and discharging power limits based on real-time battery state variables. The control parameters dynamically change according to the battery's state of charge and temperature, allowing the system to maintain optimal safety margins under varying operating conditions while using pre-stored limit values
3Duration of action of stationary object
If charging and discharging limit values are determined without considering temperature effects, then system operation is simplified, but battery voltage and temperature extremes occur leading to reduced battery lifetime
Solution Approach 1:
The patent applies segmentation by dividing the battery operating conditions into discrete states based on state of charge and temperature ranges. For each segmented state, specific charging and discharging power limit values are pre-calculated and stored. This segmentation approach captures temperature effects and their impact on battery lifetime without requiring complex continuous calculations, as the system simply selects the appropriate pre-determined limits for the current operating segment
Data Source
AI summary
A method for enhancing a battery management system for determining at least one limit value for a first characteristic variable of a battery. The method includes measuring different values of a further characteristic variable for predetermined values of the first characteristic variable in order to determine limit values of the further characteristic variable for charging and/or discharging the battery for the predetermined values of the first characteristic variable, with the result that battery discharging or charging corresponding to the limit values does not result in a battery voltage outside a permissible battery voltage range if the battery has that predetermined value of the characteristic variable which is associated with the respective limit value. The method further includes determining charging and/or discharging limit values of the characteristic variable for predetermined values of the further characteristic variable using the determined charging and/or discharging limit values.