Battery Pack Series-Parallel Switching for Low-Temperature Stability
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Solution Overview
Problem
In terminal devices with battery packs using a parallel mode, the increased internal resistance of batteries at low temperatures leads to reduced output voltage, causing stability issues and potential shutdowns.
Innovation Solution
A power supply system that includes a battery pack, a bypass circuit, a voltage step-down circuit, and a controller, allowing switching between series and parallel modes to optimize voltage output and stability based on temperature and load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery pack uses parallel mode, then the battery capacity and endurance are improved, but the output voltage decreases due to increased internal resistance at low temperatures
Solution Approach 1:
The patent implements dynamic switching between parallel and series connection modes of batteries based on real-time detection of output voltage and temperature conditions. The controller automatically adjusts the battery configuration from static to dynamic, selecting parallel mode for normal conditions (higher endurance) and series mode for low-temperature conditions (higher voltage), thereby resolving the contradiction between endurance and output voltage.
2Quantity of substance
If the battery pack uses parallel mode, then the battery capacity is increased, but the terminal device is prone to shutdown due to insufficient power supply
Solution Approach 1:
The patent employs a feedback mechanism where the controller continuously monitors the output voltage of the battery pack and compares it with a preset threshold. When the output voltage falls below the threshold (indicating low-temperature conditions affecting parallel mode performance), the controller triggers a mode switch to series connection, thereby preventing device shutdown and maintaining reliability while preserving the capacity advantage of parallel mode when conditions permit.
3Power
If the battery pack uses series mode, then the output voltage is improved, but the discharge efficiency and endurance capability are reduced
Solution Approach 1:
The patent changes the operational parameters of the battery pack by switching between series and parallel connection modes. Series mode is activated when high output voltage is required (low-temperature conditions), while parallel mode is used when high discharge efficiency and endurance are needed (normal temperature conditions). This parameter change approach allows the system to optimize for voltage when necessary while maintaining efficiency during normal operation.
Data Source
AI summary
This application provides a power supply system for a terminal device, and a chip, and relates to the charging field. The power supply system includes a battery pack, a bypass circuit, a voltage step-down circuit, and a controller. The battery pack includes at least two batteries. The controller is configured to: when the batteries in the battery pack need to be switched to a series mode, control the voltage step-down circuit to work and control the bypass circuit to stop working, and is further configured to: when the batteries in the battery pack need to be switched to a parallel mode, control the bypass circuit to work and control the voltage step-down circuit to stop working. In the system, switching between the series mode and the parallel mode can be automatically implemented based on an actual situation, so that endurance and stability of the terminal device are improved.