Series-Parallel Battery Switching for Lower Charging Conversion Loss
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Solution Overview
Problem
Existing battery charging and discharging methods face inefficiencies due to high voltage conversion losses, circuit complexity, and reduced battery life, particularly in series-connected battery systems, especially with the advent of 5G technology.
Innovation Solution
A charging and discharging method for series-parallel batteries that dynamically adjusts connection modes based on demand, using a battery combination management circuit to switch between series and parallel configurations, reducing the need for power supply chips and booster circuits, and optimizing circuit layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If series charging is used to increase charging efficiency, then charging power is improved, but power conversion loss increases due to the need for power conversion chips and booster circuits
Solution Approach 1:
The patent implements dynamic switching between series and parallel connection modes of battery packs based on real-time charging state detection. When battery voltages are consistent, series connection is used for high-power charging; when voltage difference exceeds a threshold, parallel connection is used to reduce power conversion loss. This dynamic adaptation resolves the contradiction by selecting the optimal connection mode at different charging stages.
Solution Approach 2:
The system changes the connection configuration parameter (series/parallel) based on detected battery voltage parameters. The control circuit monitors voltage consistency and switches connection modes accordingly, transforming the fixed connection structure into a variable one that adapts to changing battery states, thereby optimizing both charging power and efficiency.
2Device complexity
If fixed series connection is used to simplify circuit layout, then device complexity is reduced, but discharging loss increases
Solution Approach 1:
The patent employs dynamic connection mode switching that adapts to both charging and discharging operations. During discharging, the system detects battery state and switches between series and parallel connections to optimize power delivery and minimize losses, rather than maintaining a fixed series configuration.
Solution Approach 2:
The battery system is designed with universal switching capability that serves multiple functions: series connection for high-voltage charging and discharging, parallel connection for balanced operation and loss reduction. The same switching circuitry handles both charging and discharging modes, making the system multi-functional and adaptable to different operational requirements.
Data Source
AI summary
The present disclosure provides a charging and discharging method for series-parallel batteries applied to a series-parallel battery system including series-parallel batteries and a mainboard, the series-parallel batteries are connected to the mainboard and include at least two batteries that are connected to each other, and the method includes: determining and adjusting a connection mode of each battery of the series-parallel batteries according to a charging or discharging demand type; and charging or discharging the series-parallel batteries according to the connection mode of each battery of the series-parallel batteries. The present disclosure further provides a series-parallel battery system.