Battery Module Signal Line Noise Reduction via Parallel Conductor Routing
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Solution Overview
Problem
In battery modules, variations in cell capacitance can lead to uneven charge/discharge loads, causing premature degradation, and existing methods to monitor capacitance are susceptible to noise interference from current output lines, resulting in erroneous operations.
Innovation Solution
The battery module design includes a signal line arranged nearly equidistant and parallel to current conduction members with opposite current directions, preventing noise interference by avoiding crossings with current output lines and utilizing a metal case as a shield to reduce external noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a signal line is provided in the battery module to monitor cell capacitance, then capacitance monitoring capability is improved, but noise from current output lines interferes with the signal line causing erroneous operations
Solution Approach 1:
The signal line is extracted from the vicinity of current-carrying conductors and routed through a noise-free path along the outer periphery of the battery module, separating it from electromagnetic interference sources. This spatial extraction eliminates noise coupling while preserving monitoring functionality.
Solution Approach 2:
The metal case serves as an electromagnetic shield (intermediary) between external electromagnetic interference sources and the signal line. By positioning the signal line within the enclosed space defined by the metal case, the shield blocks external noise while allowing the signal line to perform its monitoring function.
2Power
If multiple cells are combined to form a battery module with large total power supply capacitance, then power supply capacity is improved, but variations in cell capacitance cause uneven charge/discharge loads leading to premature degradation
Solution Approach 1:
The signal line provides continuous feedback on the voltage (and thus capacitance state) of individual cells to an external monitoring system. This feedback enables real-time detection of capacitance variations, allowing the system to identify and address cells with degraded performance before they cause premature failure of the entire battery module.
Solution Approach 2:
The battery module is segmented into multiple cells with individually monitorable capacitance, allowing independent assessment of each cell's health status. This segmentation enables targeted maintenance or replacement of specific degraded cells rather than requiring replacement of the entire battery module, thereby improving overall reliability.
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 configuration effectively reduces noise superimposition on the signal line, ensuring accurate capacitance monitoring and extending the life of battery modules by preventing erroneous operations due to noise interference.
Implementation Method 1
a parallel section including two members which are opposite in direction of a current flowing therethrough
Data Source
AI summary
A battery module is provided in which a signal line is prevented from the influence of noise caused by an internal current output line.A battery module includes: a plurality of cells 100; a current conduction member 34 electrically connecting electrode terminals of the plurality of cells; and a signal line 50 configured to measure capacitance of the plurality of cells, wherein the current conduction member includes a parallel section including two members which are opposite in direction of a current flowing therethrough and are arranged substantially parallel to each other, and a connection section electrically connecting the two members at one end of the parallel section, and the signal line is arranged nearly equidistant from the two members, and extends substantially parallel to the two members to approach the connection section.