Battery Module Voltage Detection Circuit Plausibility Verification
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Solution Overview
Problem
Existing battery systems, particularly in hybrid and electric vehicles and wind turbines, face reliability issues due to the failure of a single battery cell leading to system failure, which can result in safety problems and reduced service life, as current monitoring technologies do not adequately verify the plausibility of cell voltage information across multiple modules.
Innovation Solution
A battery system with a module voltage detection circuit connected to an evaluation unit via a communication bus, which compares cell voltages measured by cell voltage detection units with module voltages to ensure reliability, using a voltage-dependent frequency generator and capacitive coupling to enhance verification and immunity to interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell voltage detection units are used to monitor each battery cell, then cell voltage monitoring capability is improved, but reliability is worsened because the plausibility of cell voltage information cannot be verified
Solution Approach 1:
The patent implements a feedback mechanism where module voltage detection units provide reference voltage information that is fed back to verify the plausibility of cell voltage measurements. The control unit compares the sum of individual cell voltages with the directly measured module voltage, creating a closed-loop verification system that enhances reliability without compromising monitoring precision.
Solution Approach 2:
The patent introduces module voltage detection units as intermediary components that directly measure module voltage and provide reference values for verification. These intermediary measurement channels act as mediators between the cell voltage detection units and the control unit, enabling plausibility verification through comparison of indirect (sum of cells) and direct (module-level) measurements.
2Use of energy by moving object
If multiple modules with series-connected battery cells are used to increase capacity, then energy storage capability is improved, but reliability is worsened because failure of a single cell leads to system failure
Solution Approach 1:
The patent implements comprehensive feedback monitoring across all modules, where each module's cell voltages are individually measured and verified against module-level reference measurements. This feedback system enables early detection of cell failures in any module, allowing the system to identify and isolate faulty cells before they cause complete system failure, thus maintaining reliability while scaling energy storage capacity.
Solution Approach 2:
The patent divides the battery system into multiple independently monitored modules, each with its own cell voltage detection unit and module voltage detection unit. This segmentation allows failure identification and isolation at the module or cell level, preventing single-point failures from propagating through the entire system and enabling continued operation of healthy modules, thereby maintaining system reliability while increasing total energy storage capacity.
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 solution allows for timely identification of malfunctions and prevention of consequential damage by verifying the plausibility of cell voltage information and ensuring overall system reliability through separate module voltage detection, enhancing safety and service life.
Implementation Method 1
the oscillator is capacitively coupled to inputs (46) of the evaluation circuit (38)
Data Source
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AI summary
The invention proposes a battery system (100) having at least one module (24) which comprises a large number of battery cells (10), wherein each module (24) has an associated cell voltage detection unit (26) which is connected to an evaluation unit (38) by means of a communications bus (36). The invention makes provision for each module (24) to additionally comprise a module voltage detection circuit (41) which is connected to the evaluation unit (38). The invention also relates to a method for monitoring a battery system having at least one module comprising a large number of battery cells, wherein a voltage of each of the battery cells is detected and supplied to an evaluation unit by means of a cell voltage detection unit, wherein, in addition, a module voltage is separately detected and supplied to the evaluation unit. The invention also provides a motor vehicle having a battery system (100), wherein the battery system (100) is connected to a drive system of the motor vehicle.