Battery Pack Power Gauge for Micro Short-Circuit Detection
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Solution Overview
Problem
Lithium-ion secondary batteries deteriorate due to repeated charging and discharging cycles, leading to anomalies such as micro short-circuits, and existing charge control circuits do not effectively monitor or mitigate these issues.
Innovation Solution
A semiconductor device with an integrated power gauge and anomalous current detection circuit, utilizing a current divider and integrator circuit to detect voltage changes and store detection signals, allowing for real-time monitoring and control of charging characteristics to prevent battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charge control circuits are used for CCCV charging, then charging efficiency is maintained, but battery deterioration and anomalies such as micro short-circuits occur due to repeated charging and discharging cycles
Solution Approach 1:
The patent applies preliminary action by detecting anomalies during charging cycles before they lead to battery failure. The detection circuit monitors voltage changes and identifies micro short-circuits early in the charging process, allowing the system to take preventive measures before deterioration progresses to critical failure points.
Solution Approach 2:
The patent implements feedback through a detection circuit that continuously monitors battery voltage changes during charging and discharging cycles. When anomalies such as micro short-circuits are detected, the system provides feedback signals to control the charging process, adjusting or stopping charging to prevent further battery deterioration and maintain reliability.
2Measurement precision
If monitoring circuits are added to detect battery anomalies, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the anomaly detection circuit with the existing charge control circuit. The detection functionality is combined with the voltage measurement and control functions already present in the charging system, allowing anomaly detection without adding separate independent monitoring systems and reducing overall device complexity.
Solution Approach 2:
The patent implements universality by designing a detection circuit that performs multiple functions: it monitors voltage changes during charging, detects micro short-circuits, and provides control signals for anomaly prevention. This multi-functional approach eliminates the need for separate specialized circuits for each function, thereby reducing device complexity while maintaining high measurement precision.
3Measurement precision
If continuous monitoring of charging characteristics is implemented, then anomaly detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing continuous monitoring during active charging and discharging cycles when the battery is connected to the charger, while reducing or suspending monitoring during idle periods when the battery is not being charged or discharged. This approach maintains high anomaly detection accuracy during critical operations while minimizing power consumption during inactive periods.
Data Source
AI summary
A semiconductor device that detects deterioration of a secondary battery is provided. The semiconductor device includes a power gauge, an anomalous current detection circuit, and a control circuit. The power gauge includes a current divider circuit and an integrator circuit. The anomalous current detection circuit includes a first memory, a second memory, and a first comparator. The integrator circuit can convert a detection current detected at the current divider circuit into a detection voltage by integrating the detection current. The anomalous current detection circuit is supplied with the detection voltage, a first signal at a first time, and a second signal at a second time. The first signal can make the detection voltage at the first time be stored in the first memory and the second signal can make the detection voltage at the second time be stored in the second memory. The first comparator outputs a change from the detection voltage at the first time to the detection voltage at the second time as a first output signal to the control circuit.