Dual-Path Battery Charging Circuit for Series Module Imbalance
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Solution Overview
Problem
Battery modules connected in series for electric vehicles often charge unbalancedly due to differences in resistance and other factors, leading to incomplete charging of individual modules and reduced overall efficiency.
Innovation Solution
A dual charging system comprising a first charging circuit for charging all battery modules in series and second charging circuits for independently charging individual modules, ensuring each module reaches a preset voltage value, thereby addressing unbalanced charging and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery modules are connected in series and charged together, then charging speed is improved, but charging balance deteriorates causing some modules not to fully charge
Solution Approach 1:
The charging system is segmented into multiple independent charging circuits, each dedicated to a specific battery module. This allows each module to be charged independently according to its own state, resolving the contradiction between fast series charging and balanced charging by enabling parallel charging operations on individual modules.
Solution Approach 2:
The charging system dynamically switches between series charging mode (for fast charging when modules are balanced) and individual module charging mode (when imbalance is detected). The control circuit monitors voltage differences and adjusts charging modes in real-time, making the system adaptable to maintain both speed and balance.
2Reliability
If individual battery modules are charged separately, then charging balance is improved, but device complexity increases
Solution Approach 1:
The charging system uses a universal control architecture that can operate in multiple modes (series charging and individual module charging) through a single integrated control circuit. This multi-functional design achieves balanced charging without proportionally increasing system complexity, as the same control hardware manages both charging strategies.
Solution Approach 2:
Each battery module is equipped with its own charging circuit that can autonomously charge the module when needed, reducing the burden on the central control system. The modules essentially serve themselves by having dedicated charging paths, which simplifies the overall control architecture while maintaining charging balance.
3Use of energy by moving object
If series charging is used, then charging efficiency is improved, but some battery modules may not reach full charge due to resistance differences
Solution Approach 1:
The control circuit continuously monitors the voltage of each battery module during charging and uses this feedback information to detect imbalance conditions. When voltage differences exceed a threshold, the system adjusts charging parameters or switches to individual module charging, ensuring all modules reach full charge while maintaining overall charging efficiency through intelligent control.
Data Source
AI summary
Various techniques described herein relate to battery packs of electric vehicles, batteries, and battery charging systems. Batteries may comprise a plurality of battery modules, wherein each battery module may be provided with one or more battery cells, and the plurality of battery modules may be connected in series when providing electric power output. Battery charging systems described herein may comprise a charging circuit that connects a plurality of battery modules in series, and may be used for charging the plurality of battery modules in the battery in series. Additional charging circuits may be connected respectively to the plurality of battery modules, and the additional charging circuits may be used for charging at least one battery module in the plurality of battery modules.