Battery Management Circuit for Low-Temperature Charging Control
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Solution Overview
Problem
Lithium-ion batteries experience reduced charging capacity in low-temperature environments, leading to potential safety issues like lithium precipitation and internal short-circuits, and existing battery management circuits consume power even in standby modes, affecting battery lifespan.
Innovation Solution
A battery management circuit that includes an acquisition circuit, processing circuit, switching elements, and an amplitude limiting circuit, which detects environmental conditions to switch between normal and current limiting charging modes, and incorporates power-saving features like low power consumption maintaining modules and isolation circuits to reduce standby power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If normal charging mode is used in low-temperature environments, then charging speed is maintained, but battery safety deteriorates due to lithium precipitation and internal short-circuits
Solution Approach 1:
The patent implements dynamic charging mode switching based on real-time temperature detection. The processing circuit monitors battery temperature and automatically transitions between normal charging mode and current limiting charging mode, making the charging system adaptive to environmental conditions rather than static.
Solution Approach 2:
The acquisition circuit continuously detects battery temperature and feeds this information to the processing circuit, which then adjusts the charging current accordingly. This closed-loop feedback mechanism ensures that charging parameters are constantly optimized based on actual battery state, preventing safety issues while maintaining charging efficiency.
2Reliability
If battery management circuit operates continuously to monitor and manage battery, then battery safety is improved, but power consumption increases affecting battery lifespan
Solution Approach 1:
The patent employs periodic action by switching the battery management circuit between working state and standby state. The isolation circuit enables the management circuit to enter low-power standby mode when full monitoring is not required, while still maintaining essential safety functions. This periodic operation reduces overall power consumption while preserving battery safety.
Solution Approach 2:
The patent changes the operational parameters of the battery management circuit by adjusting its power consumption state. The isolation circuit controls the power supply to the management circuit, allowing it to operate at different power levels (full power in working state, reduced power in standby state) based on battery conditions, thus optimizing the balance between safety monitoring and energy conservation.
Data Source
AI summary
The present application provides a battery management circuit and a battery apparatus, the battery management circuit including: an acquisition circuit, a processing circuit, a first switching element, a second switching element, and an amplitude limiting circuit, where the acquisition circuit is connected to a battery, a second end of the first switching element is connected to a first end of the second switching element, and a second end of the second switching element is connected to the ground; a first end of the amplitude limiting circuit is connected to a first end of the first switching element, and a second end of the amplitude limiting circuit is connected to the second end of the first switching element; and the processing circuit is connected to the acquisition circuit, a control end of the first switching element, and a control end of the second switching element.