EV Battery Cell Authentication Using Inherent Electrical Properties
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Solution Overview
Problem
Existing battery systems face challenges in authenticating battery cells without disclosing authentication information, leading to potential malfunctions, fires, and explosions due to the use of replacement cells, and existing authentication methods are vulnerable to copying and reverse engineering.
Innovation Solution
A battery system that authenticates battery cells using inherent physical properties such as voltage, current, and temperature measurements, comparing these properties to reference values to determine authenticity, and employing a distributed computing infrastructure to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication information is made accessible for verification, then authentication reliability is improved, but security against copying and reverse engineering deteriorates
Solution Approach 1:
The patent introduces an intermediary authentication process where the control unit verifies battery cell authenticity through inherent properties (internal resistance, capacity, open circuit voltage) rather than direct access to authentication information. This intermediary verification method maintains security while ensuring reliable authentication of original battery cells.
Solution Approach 2:
The patent replaces traditional mechanical or optical authentication methods (holograms, barcodes, RFID) with an electrical measurement-based authentication system. By measuring inherent electrical properties of the battery cells and comparing them against reference values, the system achieves secure authentication without exposing vulnerable authentication information.
2Productivity
If replacement battery cells are allowed for cost reasons, then productivity is improved, but safety deteriorates due to potential malfunctions and fires
Solution Approach 1:
The patent implements preliminary authentication of battery cells before they are integrated into the battery system. The control unit measures inherent properties of each battery cell and compares them against stored reference values to verify authenticity before allowing the cell to be used, preventing unsafe replacement cells from entering the system.
Solution Approach 2:
The patent establishes a feedback mechanism where the control unit continuously monitors battery cell properties and compares them against reference values. This feedback loop enables real-time detection of replacement cells, allowing the system to prevent their use or alert operators, thereby maintaining safety while enabling efficient battery management.
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
Provides reliable authentication of battery cells without disclosing authentication information, making it difficult for competitors to replicate, thereby reducing the risk of malfunctions and ensuring safety.
Implementation Method 1
determine an inherent physical property of at least one battery cell based on measurement values of at least one of electric current, electric voltage and/or temperature of the at least one battery cell
Data Source
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Figure 3
AI summary
The present invention refers to a battery system (100) for an electric vehicle, wherein the battery system (100) comprises a battery module (90) with a plurality of battery cells (80) and with a control module (70) connected to the battery cells (80) and a control unit (50) connected to the battery module (90) and configured to communicate with the control module (70) via a data line (61). In the battery system (100) of the invention, the control module (70) is configured to measure voltage values, current values and temperature values of at least one battery cell (80) and the control unit (50) is configured to determine an inherent physical property of a battery cell (80) based on the measurement values of the control module (70), to compare the determined inherent physical property with a reference value for the inherent physical property and to perform an authentication of the one battery cell (80) based on the comparison. The present invention further refers to a method of operating a battery system (100) and to a use of a control unit (50) of a battery system (100).