Oxide Semiconductor Battery Control Circuit for Low Power Integration
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Solution Overview
Problem
Existing battery control circuits and protection systems for power storage devices are inefficient in terms of power consumption and integration, lacking a comprehensive solution for low-power and highly integrated designs that effectively manage charging, discharging, and cell balancing across multiple battery cells.
Innovation Solution
A power storage device incorporating a substrate with a battery cell and a comparison circuit using an oxide semiconductor transistor, which compares electrode potentials to control charging and includes additional transistors and capacitors for efficient voltage management, along with a converter circuit, clock generation, and voltage retention to optimize battery operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional battery control circuits are used, then basic protection functions are provided, but power consumption is high and integration is poor
Solution Approach 1:
The patent merges the battery control circuit and protection circuit into a single integrated chip that directly contacts the battery electrode. This consolidation eliminates separate components and interconnections, achieving both high integration and reduced power consumption by minimizing the number of active components and signal paths.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: voltage detection, charging control, discharging control, and protection functions all within a single device. This multi-functionality reduces the overall system complexity and power consumption compared to using separate dedicated circuits for each function.
2Reliability
If separate protection circuits are used for each battery cell, then comprehensive protection is achieved, but device complexity and power consumption increase
Solution Approach 1:
Multiple protection functions for different battery cells are merged into a single integrated circuit. The circuit can detect and control multiple cells simultaneously through unified voltage detection and control mechanisms, achieving comprehensive protection without the complexity of separate circuits for each cell.
Solution Approach 2:
The patent transitions from a distributed architecture (separate circuits for each cell) to a centralized integrated circuit that manages multiple cells. This dimensional change in system architecture allows comprehensive protection while reducing overall complexity through centralized control and shared resources.
3Productivity
If traditional control circuits are used, then basic charging control is provided, but cell balancing efficiency is poor
Solution Approach 1:
The integrated circuit continuously monitors the voltage of each battery cell and uses feedback control to dynamically adjust charging currents. This real-time feedback mechanism enables efficient cell balancing by automatically detecting voltage differences and redistributing charge, improving productivity while maintaining low power consumption through intelligent control.
Solution Approach 2:
The control circuit dynamically adjusts charging parameters based on real-time battery state detection. The charging current and voltage are not fixed but adaptively change according to the actual condition of each cell, enabling efficient cell balancing and optimizing power consumption during the charging process.
Data Source
AI summary
A power storage device or the like with low power consumption is provided. Alternatively, a power storage device or the like with high integration is provided. A first battery cell includes a first electrode over a first substrate, a positive electrode active material layer over the first electrode, an electrolyte layer over the positive electrode active material layer, a negative electrode active material layer over the electrolyte layer, and a second electrode over the negative electrode active material layer. The comparison circuit includes a first input terminal, a second input terminal, an output terminal, and a first transistor. The first transistor includes an oxide semiconductor over the first substrate, a first insulator over the oxide semiconductor, and a gate electrode over the first insulator. The first electrode is electrically connected to the gate of the first transistor and the first input terminal. The comparison circuit has a function of outputting a first signal in response to a result of comparison between a potential of the first electrode and a desired reference potential from the output terminal to the control circuit. The control circuit has a function of controlling charging of the first battery cell in accordance with the first signal.