Battery Pack Power Cutoff via NFC-Triggered Heater Fuse
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Solution Overview
Problem
Existing battery pack systems lack an effective method to externally control the charging/discharging blocking function and cut off power in case of security issues, such as unauthorized access or system failures, as conventional protection elements rely on functional battery management systems that may fail or be compromised.
Innovation Solution
A battery pack power cutting off apparatus comprising a power cutoff mechanism with a communicator and switching system that applies power to a heater resistor to block current flow, allowing external control through Near Field Communication (NFC) and detection of abnormalities or security violations, using a field effect transistor (FET) for current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the battery management system controls the protection element to block charge/discharge lines, then abnormalities can be detected and protected against, but there is no method to block charging/discharging from the outside when an unauthorized battery pack is mounted due to theft or hacking
Solution Approach 1:
The heater resistor serves multiple functions: it can be activated by the battery management system for normal protection operations, and simultaneously can be activated by external devices through wireless communication for remote power cutoff. This multi-functionality enables both internal and external control without requiring separate mechanisms.
Solution Approach 2:
The wireless communication module acts as an intermediary that receives commands from external devices and translates them into activation signals for the heater resistor. This intermediary enables external control capability while maintaining the existing protection element structure, avoiding significant system complexity increase.
2Adaptability or versatility
If a heater resistor is used to melt and break the fuse element for external power cutoff, then external devices can control the charging/discharging blocking function and cut off power in case of security issues, but additional components (communicator, switching, heater resistor) are required
Solution Approach 1:
The patent merges the external control functionality with the existing protection element structure by integrating the heater resistor into the fuse assembly. The communicator and switching components are integrated into the existing battery management architecture, allowing external control capability to be added while sharing existing hardware resources and reducing overall 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
Enables external control of the charging/discharging function and power cutoff for battery packs with security issues, preventing unauthorized use and protecting the battery pack from faults by blocking current flow when security violations or abnormalities are detected.
Implementation Method 1
when power is applied to the heater resistor and generates heat, the power cutoff operates to block the current flowing through the line
Data Source
AI summary
A battery pack power cutting off apparatus is discussed, and includes a power cutoff configured to block a line through which a charge/discharge current of a battery module flows, a communicator configured to receive an operation signal of the power cutoff from an external device, and a switching configured to control to apply power to a heater resistor included in the power cutoff based on an operation signal of the power cutoff, wherein when power is applied to the heater resistor and generates heat, the power cutoff operates to block the current flowing through the line.