Battery Pack Discharge Current Limiting via Temperature Feedback
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Solution Overview
Problem
Mobile device battery pack temperatures can reach undesirable levels, leading to potential overheating and non-operational issues, as existing techniques often terminate discharge when a threshold is reached, causing device malfunction.
Innovation Solution
A system and method for temperature-based control of battery pack discharge current, utilizing a sensor interface and control logic to set a discharge current limit based on temperature measurements, allowing for incremental increases in the discharge current limit and issuing a shutdown command when overheating is detected, thereby preventing battery overheating and maintaining device functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If battery pack discharge is terminated when temperature threshold is reached, then battery overheating is prevented, but mobile device becomes non-operational
Solution Approach 1:
The system dynamically adjusts the discharge current limit based on real-time temperature measurements. Instead of a static threshold that causes abrupt shutdown, the controller continuously monitors temperature and adjusts the current limit accordingly, allowing the system to adapt to changing thermal conditions while maintaining operation
Solution Approach 2:
The system changes the operational parameter (discharge current limit) based on temperature conditions. By modifying the current limit parameter in response to temperature measurements, the system prevents overheating while avoiding complete shutdown, thus maintaining device functionality under varying thermal conditions
2Productivity
If battery pack discharge current is increased to maintain device performance, then device functionality is maintained, but battery temperature increases
Solution Approach 1:
The system implements a feedback mechanism where temperature measurements are continuously monitored and used to adjust the discharge current limit. The controller receives temperature feedback and dynamically modifies the current limit to maintain performance while preventing excessive temperature rise
Solution Approach 2:
The discharge current limit is made dynamic rather than fixed, allowing the system to optimize between performance and temperature control. The controller adjusts the current limit in real-time based on thermal conditions, enabling the system to maintain high performance when cool and reduce current when temperature rises
Data Source
AI summary
Systems and methods for limiting battery discharge based on battery temperature are disclosed. In an example, a controller sets a current limit, using battery temperature, and provides corresponding current limits to a power management device and a system-on-chip (SOC). Upon battery discharge current exceeding the discharge current limit, the controller increases the discharge current limit, and provides updated current limits to the PM device and the SOC. Upon the battery temperature exceeding a battery pack maximum temperature, the controller issues a shutdown command to the PM device and the SOC.