Battery Management Apparatus Voltage Region State Detection
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Solution Overview
Problem
Existing battery management systems require expensive current sensors to determine whether a secondary battery is in a charged or discharged state, increasing manufacturing costs and complexity.
Innovation Solution
A battery management apparatus and method that sets three voltage regions using different current values and internal resistance to calculate a voltage change amount, allowing the processor to determine the battery state without a current sensor by comparing the voltage change with predefined regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current sensor is used to measure the current of the secondary battery, then the accuracy of determining charged or discharged state is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the current sensing function from a dedicated current sensor and implements it through voltage measurement of the battery pack. By removing the expensive current sensor and using only voltage sensing, the system achieves current state determination without the additional cost component.
Solution Approach 2:
The patent replaces the electrical measurement system (current sensor) with a different physical measurement approach (voltage measurement). Instead of directly measuring current through a sensor, the system measures voltage changes and infers current state, substituting one measurement mechanism for another that is less costly.
2Measurement precision
If a current sensor is used to measure the current of the secondary battery, then the accuracy of determining charged or discharged state is improved, but the device complexity increases
Solution Approach 1:
The patent removes the current sensor component from the system, reducing the number of hardware elements. By extracting this function and implementing it through software-based voltage analysis, the physical complexity of the device is reduced.
Solution Approach 2:
The voltage sensing unit serves multiple functions: it measures battery voltage for state determination and indirectly provides current information through voltage change analysis. This multi-functionality eliminates the need for separate current sensing hardware, reducing overall system complexity.
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
Enables accurate determination of the battery state without the need for an expensive current sensor, reducing costs and simplifying the system while maintaining accuracy.
Implementation Method 1
a sensing unit configured to measure a pack voltage value of a battery pack
Implementation Method 2
calculates a voltage change amount of the pack voltage value, compares the first voltage region, the second voltage region and the third voltage region with the voltage change amount
Data Source
Figure 1~2
Figure 3~4
AI summary
A battery management apparatus according to the present disclosure may include: a sensing unit detachably mounted to a battery system and configured to measure a voltage of a cell assembly included in a battery pack, which is electrically connected to another battery pack in parallel, when being mounted to the battery system; a self-discharge circuit having a balancing resistor connected to a charging and discharging path of the cell assembly in parallel and a balancing switch for electrically connecting or disconnecting the cell assembly and the balancing resistor; and a processor operably coupled to the sensing unit and the self-discharge circuit.