Battery Pack Case Damage Detection Using BMS Voltage Sensing
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Solution Overview
Problem
Existing battery packs do not effectively detect damage to their cases, which can lead to issues such as foreign matter ingress and potential hazards like ignition or explosion due to external impacts.
Innovation Solution
A battery pack system with a conductive member and sensing wire connected to a BMS, allowing for voltage measurement to detect case damage by comparing measured voltages against a reference value, calculated based on the resistances of the conductive members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no damage detection system is installed in the battery pack case, then the device complexity is reduced and manufacturing cost is lowered, but the reliability and safety of the battery pack deteriorates due to undetected damage leading to potential ignition or explosion
Solution Approach 1:
The damage detection function is merged with the existing BMS voltage measurement system. The BMS uses its existing voltage output terminal and voltage measurement terminal to measure voltage across the conductive member, combining structural support and detection functions into a single integrated system rather than adding separate detection hardware
Solution Approach 2:
The conductive member serves multiple functions: it provides structural support as part of the battery pack case, acts as a sensing element for damage detection through its electrical resistance properties, and integrates with the BMS voltage measurement system. This multi-functionality reduces overall system complexity while maintaining reliability
2Measurement precision
If a complex damage detection system with multiple sensors is installed, then the measurement precision and detection accuracy improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex mechanical damage sensing systems with an electrical resistance-based detection method. The conductive member's resistance changes when damaged, and this electrical property is measured using the existing BMS voltage measurement circuitry, substituting mechanical sensors with electrical measurement
Solution Approach 2:
The conductive member itself serves as the sensing element - its inherent electrical resistance properties are utilized for damage detection without requiring separate sensor components. The structure of the battery pack case provides its own detection capability through the electrical characteristics of the conductive member
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 detection of physical damage to the battery pack case, preventing potential hazards like ignition or explosion by identifying case deformations through voltage variations.
Implementation Method 1
a conductive member (210) provided between a first surface inside the case (200) and a second surface opposite to the first surface... In response to a voltage VRcR received from the voltage measurement terminal of the BMS being equal to a reference voltage VRrefR, the BMS determines that there is no damage to a battery pack case, and in response to the voltage VRcR received from the voltage measurement terminal of the BMS being different from the reference voltage VRrefR, the BMS determines that there is damage to the battery pack case
Data Source
AI summary
A method of detecting damage to a case of a battery pack, the battery pack may include a case in which a plurality of battery cells are accommodated and a BMS (Battery Management System) configured to detect damage to the case, wherein the BMS may include a voltage output terminal configured to output a predetermined voltage, a ground terminal, and a voltage measurement terminal configured to measure voltage. In addition, the case may include a conductive member having a first end connected to the voltage output terminal of the BMS and a second end connected to the ground terminal of the BMS, and a sensing wire having a first end connected to the conductive member and a second end connected to a voltage measurement terminal of the BMS.