Vehicle Battery SOC Display Switching for Series-Parallel Packs
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Solution Overview
Problem
Existing display systems for vehicles with switchable battery modules fail to provide an appropriate power storage amount notification to users based on the vehicle's operational state, potentially causing user inconvenience.
Innovation Solution
A display system that switches between displaying average SOC and minimum SOC based on the connection state of power storage devices, either in series or parallel, using a switching circuit to ensure accurate and user-friendly power storage amount notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display system constantly displays the average SOC of all power storage devices, then the overall power storage capacity is represented, but the actual usable power storage amount is not accurately reflected when devices are in parallel connection
Solution Approach 1:
The display system dynamically changes the displayed SOC value based on the connection state detected by the switching circuit. When power storage devices are connected in parallel, the system displays the minimum SOC among all devices; when connected in series, it displays the average SOC. This dynamic adaptation ensures the displayed value accurately reflects the actual usable power storage capacity under different operational conditions.
Solution Approach 2:
The system changes the parameter being displayed (SOC value selection) based on the connection state. The control unit monitors the connection configuration and switches between displaying average SOC and minimum SOC accordingly. This parameter change approach allows the same display system to provide accurate information for both series and parallel operational modes without requiring separate display systems.
2Measurement precision
If the display system displays the minimum SOC among all power storage devices, then the actual usable power storage amount is accurately reflected, but the overall power storage capacity information is lost
Solution Approach 1:
The display system dynamically selects which SOC metric to display based on the connection state. In parallel connection mode, it displays minimum SOC to indicate usable capacity; in series connection mode, it displays average SOC to represent overall capacity. This dynamic switching prevents permanent loss of information by adapting the displayed metric to the current operational context.
Solution Approach 2:
The system changes the displayed parameter (from minimum SOC to average SOC or vice versa) based on the detected connection state. This allows the system to provide different types of information (usable capacity vs. overall capacity) as needed, rather than permanently fixing the display to show only one metric.
3Adaptability or versatility
If a switching circuit is added to enable series-parallel connection switching of power storage devices, then voltage adaptability is improved, but device complexity increases
Solution Approach 1:
The switching circuit serves multiple functions: it enables series-parallel connection switching for voltage adaptation, and simultaneously provides connection state information to the control unit for appropriate SOC display selection. By making the switching circuit multi-functional, the patent reduces the need for additional separate components, thereby managing device complexity while maintaining voltage adaptability.
Solution Approach 2:
The switching circuit provides feedback information about the connection state to the control unit. This feedback mechanism allows the display system to automatically adapt its behavior based on the current configuration, eliminating the need for manual user input or complex additional control mechanisms. The feedback loop simplifies the overall system by using the switching circuit's state information for dual purposes.
Data Source
AI summary
The display system displays information on the vehicle including the switching circuit capable of switching the series connection/the parallel connection of the plurality of power storage devices. The display system includes a display device. The display device is configured to display an average SOC when a first condition is established, the average SOC indicating an average value of an SOC of each of the power storage devices, and the display device is configured to display a minimum SOC when a second condition is established, the minimum SOC indicating a smallest value among the SOCs of the power storage devices.