Series-Parallel Battery Switching for 5V Charging Efficiency
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Solution Overview
Problem
Existing battery charging systems face inefficiencies due to the need for power conversion chips and boost circuits when adapting high voltage inputs to battery voltage, leading to power loss and reduced endurance, especially with the popularity of 5G devices.
Innovation Solution
A series-parallel battery system with a switch, series-parallel battery, and charge and discharge management circuit that allows batteries to be connected in series or parallel modes, eliminating the need for power supply chips and boost circuits, and reducing impedance loss by using a single switch for mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-voltage charging is used to reduce transmission loss, then transmission efficiency is improved, but additional power conversion components are required which increase device complexity
Solution Approach 1:
The patent applies dynamic switching between series and parallel battery connections through a control circuit that monitors charging voltage and current. During high-voltage charging, batteries are connected in series to match the high input voltage; during discharge or low-voltage charging, they switch to parallel connection. This dynamic reconfiguration eliminates the need for fixed power conversion components, reducing device complexity while maintaining transmission efficiency.
Solution Approach 2:
The invention changes the electrical parameters (voltage and current distribution) by reconfiguring battery connections from series to parallel mode. This parameter transformation allows the battery system to adapt to different charging conditions without requiring additional power conversion hardware, thereby reducing device complexity while managing transmission loss effectively.
2Productivity
If power supply chips and boost circuits are added to enable high-voltage charging, then charging efficiency is improved, but device weight and cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary power conversion components (power supply chips and boost circuits) by using a dual-mode battery system. The extraction is achieved by relying on the inherent voltage characteristics of series-connected batteries during charging and parallel-connected batteries during discharge, thereby reducing device weight while maintaining charging efficiency.
Solution Approach 2:
The battery system performs multiple functions: it can accept high-voltage charging in series mode, provide stable voltage output in parallel mode, and protect individual battery cells through integrated protection circuits. This multi-functionality eliminates the need for separate power conversion components, reducing device weight while preserving charging efficiency.
3Reliability
If multiple protection circuits are used for each battery cell, then battery safety is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the protection functions for multiple battery cells into a single integrated protection circuit that monitors and controls all cells collectively. Instead of implementing separate protection circuits for each cell, the system uses shared sensing and control mechanisms that reduce circuit complexity while maintaining comprehensive safety coverage across all battery cells.
Data Source
AI summary
A series-parallel battery system includes: a switch (1), a series-parallel battery (2) and a charge and discharge management circuit (3). The series-parallel battery (2) includes a battery combination management circuit (23) and at least two batteries connected to each other. The battery combination management circuit (23) is connected to the batteries. One battery in the series-parallel battery (2) includes a second battery cell (22) and a third protection circuit (26). Other batteries in the series-parallel battery (2) include a first battery cell (21), a first protection circuit (24) and a second protection circuit (25). The switch (1) is connected to the batteries. The charge and discharge management circuit (3) is connected to the battery combination management circuit (23) and used for controlling states of the switch (1), of the first protection circuit (24), and of the second protection circuit (25), so as to adjust a connection mode of the batteries.