Battery Pack Abnormality Detection Circuit Topology
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Solution Overview
Problem
Conventional abnormality detection apparatuses for battery packs cannot distinguish between breakage of detection lines and overcharge or overdischarge conditions, leading to unnecessary replacement of battery packs or detection line checks.
Innovation Solution
The apparatus includes a first determining function for abnormality detection based on voltage thresholds, a short-circuit function between detection lines, and a third determining function for faulty electrical continuity, allowing for reliable detection of line breakage and polarity inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage threshold detection is used to detect overcharge or overdischarge conditions, then abnormality detection capability is improved, but inability to distinguish between line breakage and overcharge/discharge conditions leads to unnecessary battery pack replacements
Solution Approach 1:
The detection function is segmented into two distinct modes: overcharge/discharge detection mode and line breakage detection mode. The switching element divides the detection process into separate operational phases, allowing each mode to be optimized independently without interference from the other.
Solution Approach 2:
Before performing overcharge or overdischarge detection, the system performs a preliminary line breakage detection by turning on the switching element to short-circuit the battery cell. This preliminary action ensures that line integrity is verified before voltage threshold comparisons are made, preventing false positives.
2Reliability
If switching elements are added to short-circuit battery cells for line breakage detection, then line breakage detection capability is improved, but device complexity increases
Solution Approach 1:
The switching element serves multiple functions: it acts as a short-circuiting device for line breakage detection, a selection switch for alternating between detection modes, and a control element for managing detection sequencing. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The line breakage detection function is merged with the existing overcharge/discharge detection system by using the same voltage detection circuits and switching elements. The single switching element integrates both detection capabilities into one unified system rather than requiring separate independent systems.
3Reliability
If detection lines are checked during maintenance periods, then line breakage detection is improved, but productivity is reduced due to unnecessary checks and replacements
Solution Approach 1:
The system performs self-diagnosis by automatically detecting line breakages through the switching element mechanism. The detection is integrated into the normal operation, allowing the system to identify and flag line breakage issues without requiring external maintenance intervention or manual checking procedures.
Solution Approach 2:
The system provides immediate feedback about line breakage conditions through the detection circuit. When a line breakage is detected via the switching element, the system generates a distinct signal that differentiates it from overcharge/discharge conditions, enabling real-time monitoring and eliminating the need for periodic manual maintenance checks.
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 reliable detection of breakage or faulty continuity in detection lines connected to battery cells, distinguishing between line issues and overcharge/discharge conditions, reducing unnecessary replacements and checks.
Implementation Method 1
detect a voltage across each of the unit batteries on the basis of voltages between each two adjacent detection lines
Implementation Method 2
a short-circuit function of making a short-circuit between a detection line of interest connected to one electrode of a unit battery of interest and an adjacent detection line connected to the other electrode of the unit battery of interest
Data Source
AI summary
The abnormality detection apparatus for a battery pack includes a first determining function of making a first determination that abnormality is present when a voltage across a unit battery of interest is higher than a first threshold, a second determining function of making a second determination that abnormality is present when the voltage is lower than a second threshold lower than the first threshold, a short-circuit function of making a short-circuit between a detection line of interest connected to one electrode of a unit battery of interest and an adjacent detection line connected to the other electrode of the unit battery, and a third determining function of making a third determination that there is faulty electrical continuity in the detection line of interest if the first determining function makes the first determination and the second determining function makes the second determination when the short circuit function makes the short-circuit.