Motor Vehicle Battery Module Reconnection After Extended Downtime
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Solution Overview
Problem
Battery modules in motor vehicle units experience large voltage differentials during extended downtimes, leading to potentially damaging equalizing currents when reconnected, as they discharge at different rates.
Innovation Solution
Monitoring the battery unit's powered-off state and transitioning it to a powered-on state when downtime exceeds a threshold, connecting modules in parallel to equalize voltages through the on-board network, with adaptive time thresholds based on voltage differentials to minimize unnecessary transitions and ensure safe reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery modules are connected in parallel during extended downtimes, then voltage differentials are reduced, but unnecessary power-on transitions and energy consumption occur
Solution Approach 1:
The control method performs preliminary action by transitioning the battery unit to powered-on state before voltage differentials become problematic. The method monitors downtime duration and proactively activates the battery unit when the threshold is reached, preventing the development of large voltage differentials that would occur during extended idle periods.
Solution Approach 2:
The system dynamically adjusts its behavior based on real-time conditions. The control unit continuously monitors the powered-off state duration and transitions the battery unit between powered-off and powered-on states based on the time threshold, creating a dynamic response to changing conditions rather than a static configuration.
2Reliability
If battery unit is kept in powered-on state frequently, then voltage differentials are compensated, but energy consumption increases
Solution Approach 1:
The control method implements periodic action by transitioning the battery unit to powered-on state at regular intervals determined by the time threshold. Instead of continuous operation, the system activates periodically to compensate voltage differentials, then returns to powered-off state, reducing overall energy consumption while maintaining voltage matching.
Solution Approach 2:
The system changes operational parameters by switching between powered-off and powered-on states based on the monitored downtime. The time threshold parameter controls when this transition occurs, allowing optimization between voltage compensation effectiveness and energy consumption by adjusting how frequently the battery unit is activated.
Data Source
AI summary
A method is provided for controlling a battery unit of a motor vehicle. The battery unit is configured to provide electrical energy to an electric drivetrain (M) of the motor vehicle, and the electric drivetrain (M) is configured to drive the motor vehicle. The battery unit has a plurality of battery modules (U1, U2, UN, V1, V2, VN, W1, W2; WN). The method comprises: monitoring whether the battery unit is in a powered-off state; measuring a period of time during which the battery unit is in the powered-off state; and transitioning the battery unit from the powered-off state into a powered-on state when the period of time exceeds a time threshold. The battery modules (U1, U2, UN, V1, V2, VN, W1, W2; WN) are connected electrically in parallel to one another in the powered-on state.