Bipolar Battery Mirror Current Diagnostic System
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Solution Overview
Problem
The use of bipolar batteries as traction power sources in vehicles presents challenges due to the need for a large number of terminals for degradation diagnosis, which increases size, weight, and cost, compromising the advantages of small size, light weight, and reduced costs.
Innovation Solution
A power source control system that includes a first bipolar battery for traction motor power, a second bipolar battery for diagnostics, a mirror current generator, and a diagnostic unit that simulates the degradation state of the first battery in the second battery based on voltage or temperature, allowing for reduced terminal requirements and improved diagnosis accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of terminals are added to the bipolar battery for degradation diagnosis, then the diagnostic capability is improved, but the size, weight, and cost of the battery increase
Solution Approach 1:
The patent creates a mirror current that replicates the electrical stress conditions of the first battery in the second battery, allowing degradation diagnosis to be performed on the second battery as a proxy for the first battery. This eliminates the need for multiple terminals on each battery, as only the second battery requires diagnostic terminals.
Solution Approach 2:
The second battery serves as an intermediary device that experiences the same mirror current conditions as the first battery. By diagnosing the second battery, we indirectly assess the degradation state of the first battery without needing to access multiple terminals on the first battery itself.
2Measurement precision
If a large number of terminals are added to the bipolar battery for degradation diagnosis, then the diagnostic capability is improved, but the size of the battery increases
Solution Approach 1:
The mirror current mechanism allows the second battery to replicate the degradation patterns of the first battery. This copying approach enables comprehensive degradation monitoring with minimal terminal connections, reducing the overall volume required for diagnostic infrastructure.
Solution Approach 2:
The second battery serves multiple functions: it acts as both a functional component in the electrical system and as a diagnostic test subject. This multi-functionality eliminates the need for separate diagnostic terminals on the first battery, reducing overall system volume.
3Measurement precision
If a large number of terminals are added to the bipolar battery for degradation diagnosis, then the diagnostic capability is improved, but the manufacturing cost increases
Solution Approach 1:
By using the mirror current to create identical degradation conditions in the second battery, the system enables cost-effective diagnosis of the first battery. Only the second battery requires diagnostic terminals, significantly reducing the total number of terminals needed compared to equipping each battery individually.
Solution Approach 2:
The second battery essentially serves itself as a test subject for diagnosing the first battery's degradation. This self-service approach eliminates the need for complex diagnostic infrastructure on the first battery, reducing manufacturing costs for terminals and associated wiring.
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
This configuration reduces the size, weight, and cost of the bipolar battery while enabling effective degradation diagnosis and simulation of the first battery's state, enhancing the accuracy of the diagnostic process and maintaining the advantages of bipolar batteries.
Implementation Method 1
The mirror current generator is configured to generate a mirror current based on a current flowing through the first battery. The mirror current supply source is configured to cause the mirror current to flow through the second battery.
Implementation Method 2
The diagnostic unit is configured to perform degradation diagnosis on the second battery on the basis of at least one of a voltage or a temperature of the second battery.
Data Source
AI summary
A power source control system for a vehicle is provided, which includes a traction motor, the system including a first battery that is a bipolar battery and is to be used as a power source for the traction motor; a second battery that is a bipolar battery different from the first battery; a mirror current generator circuit configured to generate a mirror current based on a current flowing through the first battery; a mirror current supply source circuit configured to cause the mirror current to flow through the second battery; and a diagnostic circuit configured to perform degradation diagnosis on the second battery on a basis of at least one of a voltage or a temperature of the second battery.