EV Battery Authenticity Diagnosis Using Controlled Discharge
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Solution Overview
Problem
Existing battery diagnosis methods struggle to accurately determine the authenticity and condition of batteries mounted on electric vehicles, especially when replaced by unauthorized dealers, as they rely on assumptions of genuine products and require physical inspection or removal from the vehicle.
Innovation Solution
A battery diagnosis apparatus using a battery control unit (BCU) performs a diagnosis process by discharging a predetermined current, analyzing voltage and output values, and comparing them to genuine battery standards to identify non-genuine or aged batteries without requiring physical inspection or removal, employing a second current limit control to prevent malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing battery diagnosis methods are used, then the diagnosis process is simple, but the accuracy of determining whether a battery is genuine or aged is insufficient
Solution Approach 1:
The patent applies parameter changes by measuring multiple battery parameters (voltage, current, output value) under controlled discharging conditions and comparing them against reference values. This transforms the diagnosis from a simple single-parameter check to a multi-parameter analysis, significantly improving diagnosis accuracy while maintaining manageable system complexity through systematic measurement protocols.
2Reliability
If the battery package is opened or the vehicle is brought to a dealer for diagnosis, then the authenticity can be confirmed, but the user convenience is reduced and time is lost
Solution Approach 1:
The patent implements self-service by enabling the battery diagnosis to be performed automatically by the battery control unit itself using the vehicle's existing power supply system. The controller discharges the battery at a predetermined current and measures the output characteristics without requiring external equipment or dealer intervention, allowing users to verify battery authenticity conveniently while maintaining high reliability.
3Measurement precision
If a predetermined current is discharged from the battery for diagnosis, then the output value can be measured, but the battery voltage decreases
Solution Approach 1:
The patent applies partial action by discharging the battery at a predetermined current that is sufficient to obtain measurable output characteristics but controlled to prevent excessive voltage depletion. The diagnosis uses the measured output value and voltage relationship during this controlled partial discharge, then restores normal battery operation, achieving accurate measurement while minimizing impact on battery state.
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 accurate diagnosis of battery authenticity and condition while mounted on a vehicle, preventing malfunctions and ensuring reliable performance without physical intervention, and allowing for user-initiated diagnosis.
Implementation Method 1
a battery diagnosis apparatus configured to perform a diagnosis process that determines whether a battery mounted on an electric vehicle is a normal product
Data Source
AI summary
A battery diagnosis apparatus is configured to perform a diagnosis process that determines whether a battery mounted on an electric vehicle is a normal product. The battery diagnosis apparatus includes a battery control unit. The battery control unit is configured to diagnose that the battery is not the normal product when one of the following conditions is satisfied: a voltage of the battery decreases to a lower limit voltage before a predetermined time elapses from a start of discharging of a current having a predetermined current value from the battery; and an output value from the battery during a period from the start of the discharging until the elapse of the predetermined time is equal to or less than a predetermined ratio of an output value to be outputted from a genuine, new battery during the period from the start of the discharging until the elapse of the predetermined time.