Battery Cell Recovery Sensing for Compression-Aware State Estimation
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Solution Overview
Problem
Existing energy storage devices, such as lithium ion secondary batteries, face challenges in optimizing discharging capacity and energy density, particularly in vehicles, where varying compression forces affect performance recovery and state estimation, leading to inefficient control and estimation methods.
Innovation Solution
A method is developed to acquire information on performance recovery during charging/discharging suspension, allowing for appropriate control and state estimation based on the type of energy storage device, including compression force and electrode assembly type, to determine optimal suspension times and improve energy storage system management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the volume occupancy of the energy storage device increases, then the performance (discharging capacity and energy density) is improved, but the expansion of the energy storage device during charging increases, requiring higher compression force
Solution Approach 1:
The patent applies dynamics by making the compression force adjustable rather than fixed. The compression force is dynamically changed based on the state of charge (SOC) of the energy storage device, being stronger during charging to suppress expansion and weaker during discharging to accommodate volume changes. This dynamic adjustment resolves the contradiction by allowing high volume occupancy while managing expansion forces through adaptive compression.
Solution Approach 2:
The patent changes the parameter of compression force based on operating conditions. By varying the compression force according to charging/discharging states and using different compression forces for different types of energy storage devices (high compression type vs. low compression type), the system achieves high volume occupancy without requiring continuously high compression force, thus resolving the contradiction between volume occupancy and compression force requirements.
2Stability of the object's composition
If a high compression force is applied to suppress expansion, then the structural stability is improved, but the performance recovery during suspension of charging/discharging is affected differently depending on device type
Solution Approach 1:
The patent applies local quality by recognizing that different energy storage devices have different local characteristics (high compression type vs. low compression type). Instead of applying a uniform compression strategy, the system identifies the specific type of energy storage device and applies appropriate compression force and suspension time parameters tailored to each type, thereby maintaining structural stability while ensuring optimal performance recovery for each device category.
Solution Approach 2:
The patent uses dynamics by adjusting the suspension time of charging/discharging based on the compression force applied and the type of energy storage device. The suspension time is dynamically determined to allow performance recovery after compression, resolving the contradiction between maintaining structural stability through compression and ensuring reliable performance recovery by allowing adequate suspension time specific to each device type.
3Stability of the object's composition
If the compression force is increased to maintain stability during high volume occupancy, then the device stability is improved, but the control complexity increases due to varying requirements for different device types
Solution Approach 1:
The patent manages control complexity by changing parameters (compression force and suspension time) based on identified device types. The control system determines whether the energy storage device is of the high compression type or low compression type and applies corresponding parameter settings. This parameter-based approach maintains device stability while avoiding the need for complex continuous adjustment mechanisms, resolving the contradiction between stability and control complexity.
4Quantity of substance
If the volume occupancy is increased to improve energy density, then the energy storage capacity is improved, but the expansion during charging requires more precise control to prevent damage
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the compression force during charging/discharging cycles based on the state of charge and device type. This dynamic control allows high volume occupancy and energy density while preventing damage through real-time adjustment of compression force, resolving the contradiction between energy density and control precision requirements.
Solution Approach 2:
The patent applies preliminary action by determining the type of energy storage device in advance and pre-setting appropriate compression force and suspension time parameters. This preliminary identification and parameter setting enables high energy density designs while built-in control precision is ensured through pre-configured appropriate compression strategies for each device type.
Data Source
AI summary
A method for acquiring information of a battery cell (11) includes a step (S101) of acquiring information pertaining to performance recovery accompanying the suspension of charging/discharging of the battery cell (11). Control pertaining to the battery cell (11) and estimation of a state of the battery cell (11) can be appropriately performed according to a type of battery cell (11).