Battery Pack Fault Detection via Anti-Parallel Diodes
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Solution Overview
Problem
Conventional battery pack fault detection methods face challenges in distinguishing between battery faults and detecting line faults, especially in lithium battery packs, due to the length of detection wires which are prone to breakdown, making it difficult to ensure reliable power supply and safety.
Innovation Solution
A battery-pack fault detecting device and method utilizing N diodes connected anti-parallel with each battery, shared detecting lines between adjacent batteries, and a switch control circuit to selectively switch on/off switches for voltage collection and comparison with preset values, allowing for accurate identification of faults within the battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a long electric wire is used to connect the battery and the detecting device, then the detection range is extended, but the wire is easier to break down causing faults
Solution Approach 1:
The patent introduces diodes as intermediary components connected to each battery in anti-parallel configuration. These diodes act as mediators that enable voltage detection without requiring long external detecting wires. The diodes work with shared detecting lines and switch control circuits to measure battery voltages, thereby eliminating the need for long vulnerable wires while maintaining detection capability.
Solution Approach 2:
The patent implements a multi-functional detection system where a single detecting line serves multiple batteries. The shared detecting line, combined with diodes and switch control, can detect voltages of multiple batteries sequentially or simultaneously. This universal approach reduces the number of detecting lines needed and minimizes wire length requirements while maintaining comprehensive monitoring capability.
2Measurement precision
If voltage measurement is performed using conventional detecting devices, then the battery voltage can be measured, but it is hard to judge whether the fault is caused by the battery or by the electric wire
Solution Approach 1:
The patent segments the detection system by connecting individual diodes to each battery. This segmentation allows the detection circuit to isolate and measure each battery's voltage independently through switch control. By measuring voltages of individual batteries and comparing them with preset values, the system can identify whether a fault lies with a specific battery or with the shared detecting line, thereby solving the fault location identification problem.
Solution Approach 2:
The patent implements a feedback mechanism where the detection control circuit compares measured battery voltages with preset threshold values. Based on this comparison, the system provides feedback to determine whether a battery is faulty or whether the detecting line is faulty. This feedback loop enables automatic fault diagnosis and identification without requiring manual inspection.
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 quick, accurate, and reliable detection of faults, differentiating between battery and detecting line issues, ensuring the battery pack's safety and efficiency by implementing an automated and selective control mechanism.
Implementation Method 1
N diodes, wherein each battery is connected with one of the N diodes in anti-parallel via a detecting line
Data Source
AI summary
A battery-pack fault detecting device and a method for detecting a fault of a battery pack are provided. The battery-pack fault detecting device includes: N diodes, in which each battery is connected with one of the N diodes in anti-parallel via a detecting line; N+1 switches; a switch control circuit for switching on or switching off each switch; a voltage collecting circuit connected with the switch control circuit for collecting a voltage of the battery; an analog-to-digital conversion circuit for performing an analog-digital conversion on the voltage of the battery to obtain a digital voltage; a detection control circuit connected with the switch control circuit and the analog-to-digital conversion circuit, for controlling the switch control circuit to switch on or off each switch and for comparing the digital voltage with a preset value to judge a fault of the battery pack.