All-Solid-State Battery Control for Directional Impact Thresholds
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Solution Overview
Problem
Conventional systems for all-solid-state lithium secondary batteries do not account for various impacts, leading to unnecessary stopping of charging and discharging due to collisions or vertical shaking, despite the battery's mechanical strength being sufficient.
Innovation Solution
A vehicle control method using a three-axis acceleration sensor to detect accelerations in orthogonal directions, allowing charging and discharging until a second reference value is exceeded in the stacking direction, which has higher mechanical strength than directions intersecting it, thereby preventing unnecessary shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging and discharging is prohibited when the first acceleration exceeds the first reference value, then safety is improved, but productivity deteriorates due to unnecessary shutdowns
Solution Approach 1:
The patent applies different reference values for different directions: a first reference value for directions intersecting the stacking direction and a second reference value (larger than the first) for the stacking direction. This directional differentiation allows the system to maintain safety while reducing unnecessary shutdowns, as the battery can continue operating when acceleration occurs in the mechanically stronger stacking direction.
Solution Approach 2:
The patent changes the threshold parameter (reference value) based on the direction of acceleration. By setting the second reference value in the stacking direction to be larger than the first reference value in intersecting directions, the system adapts the safety threshold to match the anisotropic mechanical strength of the battery, thereby preventing unnecessary operational interruptions.
2Productivity
If charging and discharging is allowed until the second acceleration exceeds the second reference value, then productivity is improved, but safety may deteriorate if the threshold is set too high
Solution Approach 1:
The patent recognizes that the battery has different mechanical strength characteristics in different directions (anisotropic properties). By setting direction-specific reference values, the system maintains safety margins while maximizing operational continuity, allowing charging/discharging to continue when acceleration occurs in the stronger stacking direction.
Solution Approach 2:
The system dynamically adjusts the threshold for shutting down charging/discharging operations based on the direction of applied acceleration. Rather than using a single static threshold, the system responds differently to acceleration in intersecting directions versus the stacking direction, optimizing both safety and productivity.
3Productivity
If the mechanical strength in the stacking direction is made higher, then productivity is improved by reducing unnecessary shutdowns, but device complexity increases due to directional orientation requirements
Solution Approach 1:
The patent exploits the inherent local quality difference in the battery's mechanical strength by orienting the stacking direction along the vehicle's front-rear axis. This orientation allows the system to take advantage of the higher mechanical strength in the stacking direction during typical vehicle operation, reducing unnecessary shutdowns while maintaining manageable complexity through natural alignment with vehicle dynamics.
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 approach effectively suppresses unnecessary shutdowns of the all-solid-state battery by allowing continued operation within its mechanical limits, enabling the vehicle to travel after minor impacts.
Implementation Method 1
an acceleration sensor that detects a first acceleration in a direction intersecting the predetermined direction and a second acceleration in the predetermined direction
Data Source
AI summary
The electrified vehicle includes an all-solid-state battery in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are stacked in the front-rear direction (predetermined direction) of the electrified vehicle. The electrified vehicle also includes an acceleration sensor that detects a first acceleration in a direction perpendicular to the longitudinal direction and a second acceleration in the longitudinal direction. In an electrified vehicle, charging and discharging of the all-solid-state battery is prohibited when the first acceleration exceeds the first reference value, and the all-solid-state battery is prohibited until the second acceleration exceeds a second reference value that is larger than the first reference value, charging/discharging is allowed.