Battery Pack Sleep Control via Load and Charger Detection
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Solution Overview
Problem
Lithium-ion battery management systems face challenges in managing their own power consumption, leading to reduced standby time due to inability to efficiently control power states during charging and discharging processes.
Innovation Solution
A controller and battery management method that detects connection to loads and chargers, enabling the battery pack to enter sleep modes based on parameter conditions, thereby controlling charging and discharging switches to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery management system continuously monitors battery parameters and maintains active operation, then the reliability and safety of battery management is improved, but the power consumption increases and standby time decreases
Solution Approach 1:
The patent implements dynamic operation modes for the battery management system, switching between wake mode and sleep mode based on real-time conditions. The controller dynamically adjusts its operational state: in wake mode, it fully monitors battery parameters for high reliability; in sleep mode, it reduces power consumption by disabling certain monitoring functions. This dynamic adaptation resolves the contradiction by allowing the system to optimize between reliability and standby time based on current battery status and external conditions.
Solution Approach 2:
The system changes operational parameters (power state, monitoring frequency, circuit activation) based on battery health status and environmental conditions. When battery parameters indicate stable conditions and no external connections are detected, the system transitions to sleep mode with reduced parameter activity. This parameter adjustment allows the system to extend standby time while maintaining adequate monitoring capability, resolving the contradiction between continuous monitoring and power conservation.
2Speed
If the detection circuit remains active to monitor connection status, then the responsiveness to external devices is improved, but the power consumption increases
Solution Approach 1:
The detection circuit operates periodically rather than continuously. The system uses intermittent polling to detect connection status between the battery pack and external devices. During sleep mode, the detection circuit performs periodic checks at extended intervals, allowing the system to maintain eventual responsiveness while significantly reducing average power consumption compared to continuous monitoring.
3Adaptability or versatility
If the battery management system maintains full operational capability, then the adaptability to different operating conditions is improved, but the power consumption increases
Solution Approach 1:
The battery management system is segmented into different operational modes (wake mode and sleep mode) with distinct functional capabilities. In wake mode, the system provides full operational adaptability for charging, discharging, and monitoring. In sleep mode, only essential functions remain active. This segmentation allows the system to adapt its capability level to current needs, maintaining versatility when required while conserving power during standby periods.
Data Source
AI summary
A controller for managing a battery pack includes: a detection terminal, for transmitting an enable signal when values of battery parameters for the battery pack satisfy a sleep condition, where the enable signal enables the detection circuit to detect whether the battery pack is connected to a load and whether the battery pack is connected to the charger; and a receiving terminal, for receiving a detection result transmitted by the detection circuit. The detection result indicates whether the battery pack is connected to at least one of the load and charger. The controller controls the battery pack to enter a sleep mode of the sleep modes based on the detection result. The controller also includes a control terminal, for transmitting a control signal to control an on/off state of a charging switch and/or a discharging switch. The control signal is generated by the controller based on the detection result.