Battery Charging Circuit With Low-Temperature Current Limiting
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Solution Overview
Problem
Lithium-ion batteries experience significant capacity reduction 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 service life.
Innovation Solution
A battery management circuit with an acquisition circuit, processing circuit, switching elements, and amplitude limiting circuit that adjusts charging modes based on environmental conditions, incorporating low power consumption modules and isolation circuits to reduce standby power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery management circuits are used, then basic charging protection is provided, but power consumption continues even in standby mode, reducing battery service life
Solution Approach 1:
The battery management circuit dynamically adjusts its operating state based on charging conditions. The control circuit switches between active monitoring mode (during charging) and low-power standby mode (when charging is complete or interrupted), allowing the system to maintain protection capabilities while minimizing power consumption during idle periods
Solution Approach 2:
The circuit employs periodic sampling of battery parameters rather than continuous monitoring. The acquisition circuit periodically measures voltage, current, and temperature, with the control circuit activating full monitoring only when charging events are detected, thereby reducing overall power consumption while maintaining adequate protection
2Productivity
If charging is performed in low-temperature environments, then battery charging is enabled, but lithium precipitation and internal short-circuits may occur, compromising safety
Solution Approach 1:
The acquisition circuit continuously monitors battery temperature and provides feedback to the control circuit. When low temperature is detected, the control circuit adjusts charging parameters or interrupts charging to prevent lithium precipitation, thereby maintaining safety while enabling charging when conditions are appropriate
Solution Approach 2:
The circuit changes charging parameters based on detected temperature conditions. In low-temperature environments, the control circuit modifies charging current limits or voltage thresholds to prevent harmful effects, allowing safe charging operation across different environmental conditions
Data Source
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AI summary
A battery management circuit and a battery apparatus, including: an acquisition circuit (11), a processing circuit (12), a first switching element (101), a second switching element (102), and an amplitude limiting circuit (13), where the acquisition circuit (11) is connected to a battery, a second end of the first switching element (101) is connected to a first end of the second switching element (102), and a second end of the second switching element (102) is connected to the ground; a first end of the amplitude limiting circuit (13) is connected to a first end of the first switching element (101), and a second end of the amplitude limiting circuit (13) is connected to the second end of the first switching element (101); and the processing circuit (12) is connected to the acquisition circuit (11), a control end of the first switching element (101), and a control end of the second switching element (102). The processing circuit (12) is configured to switch to a normal charging mode or a current limiting charging mode by controlling states of the first switching element (101) and the second switching element (102) according to a battery operating environment detected by the acquisition circuit (11). By means of acquiring a circuit parameter through the acquisition circuit (11), switching to a charging mode through the processing circuit (12), and completing current limiting through the amplitude limiting circuit (13), normal automatic charging or current limiting charging of the battery under different operating conditions can be achieved.