Battery Management Unit Voltage Stability Deterioration
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Solution Overview
Problem
Energy storage devices, such as lithium ion secondary batteries, deteriorate when the voltage does not substantially change, leading to increased direct current resistance and decreased charge capacity, which existing techniques fail to adequately address.
Innovation Solution
An energy storage apparatus with a management unit that detects when the voltage of the device does not substantially change and initiates discharge processing to prevent deterioration, using a discharge circuit separate from the equalization circuit to intermittently discharge the device and alter current intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the energy storage device is left in a state where voltage does not substantially change, then the device can maintain a stable state, but deterioration occurs due to polymer formation near electrodes
Solution Approach 1:
The management unit performs periodic detection of voltage states and initiates periodic discharge processing when the voltage remains substantially unchanged for a predetermined time or more. This periodic intervention prevents polymer formation by intermittently altering the electrochemical environment, thus maintaining device reliability while allowing stable operation between discharge cycles.
2Reliability
If discharge processing is performed to suppress deterioration, then device performance is maintained, but additional control complexity is introduced
Solution Approach 1:
The management unit autonomously monitors the voltage state of the energy storage device and automatically initiates discharge processing when deterioration conditions are detected. The system serves itself by detecting its own state and applying the necessary corrective action without external intervention, thereby maintaining performance while adding only minimal control logic.
3Reliability
If the energy storage device is continuously discharged to prevent polymer formation, then deterioration is suppressed, but energy loss increases
Solution Approach 1:
Instead of continuous discharge, the management unit performs discharge processing only periodically when the voltage remains substantially unchanged for a predetermined time or more. This conditional periodic discharge prevents polymer formation and suppresses deterioration while minimizing unnecessary energy loss by keeping the device in a stable charged state during normal operation.
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 deterioration by eliminating the conditions conducive to polymer formation near the electrodes, thereby maintaining the device's performance and capacity retention.
Implementation Method 1
an energy storage device in which a positive electrode and a negative electrode are immersed in a nonaqueous electrolyte solution
Data Source
AI summary
Disclosed is an energy storage apparatus 2 including a battery cell 16 in which a positive electrode P and a negative electrode N are immersed in a nonaqueous electrolyte solution 18 in a state of being partitioned by a separator 20 and a BMU 46, in which the BMU 46 executes detection processing of detecting a state in which a voltage of the battery cell 16 does not substantially change, and discharge processing of discharging the battery cell 16 in response to detection of the state in the detection processing.