Battery Pack Voltage Measurement for Contact Resistance Detection
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Solution Overview
Problem
Current battery packs cannot effectively detect high-temperature heat generated due to increased contact resistance in high-current paths, which can lead to secondary accidents such as melting or fires.
Innovation Solution
A battery pack system that includes a relay and a battery management system (BMS) to measure voltage and detect abnormal resistance in the high-current path, triggering a warning and potentially shutting down the system to prevent accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high current flows in the power path, then power delivery is improved, but contact resistance increases causing high-temperature heat generation
Solution Approach 1:
The BMS measures voltage at the battery terminal before high-temperature heat can be generated, and calculates resistance in advance. When abnormal resistance is detected, the system issues a warning or shuts down the relay before the high current causes dangerous heat generation, thus preventing the temperature increase while maintaining power delivery capability
Solution Approach 2:
The system continuously monitors the voltage at the battery terminal and calculates resistance based on the measured voltage and current flow. This feedback mechanism allows the BMS to detect changes in contact resistance in real-time and take corrective actions (warning or shutdown) to prevent harmful temperature increases while maintaining optimal power delivery
2Measurement precision
If voltage measurement is performed at battery terminal, then resistance detection capability is improved, but system complexity increases
Solution Approach 1:
The BMS uses its existing voltage measurement capability, which is already part of the battery management system, to detect resistance by measuring voltage at the battery terminal. The system calculates resistance using the measured voltage and known current, thus achieving resistance detection without adding separate measurement hardware or increasing system complexity
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
The system can detect abnormal resistance and prevent secondary accidents by transmitting a warning and potentially shutting down the vehicle, thereby preventing high-temperature heat-related issues.
Implementation Method 1
A screw or a bolt for fastening the bus bars or the bus bar and the wire in the power path may be loosened or contact resistance may increase due to worn wires. In this state, when a high current flows, high-temperature heat is generated due to increased contact resistance
Implementation Method 2
In this state, when a high current flows, high-temperature heat is generated due to increased contact resistance
Data Source
AI summary
Disclosed is a battery pack connected to a host system, the battery pack including: a relay connected between a battery terminal of the battery pack and the host system; at least two battery modules, each of which includes a plurality of serially connected cells and generates battery detection information; and a battery management system (BMS), which measures a voltage of the battery terminal when a current having a predetermined value or larger flows in a high current path between the battery pack and the host system, receives at least two pieces of battery detection information from the at least two battery modules, respectively, and determines a coupling state of the battery pack based on the voltage of the battery terminal and the at least two pieces of battery detection information.