Dual Charging Circuit for Battery Module Voltage Balance
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Solution Overview
Problem
Battery modules connected in series for electric vehicles often charge unbalancedly due to differences in resistance, leading to some modules not being fully charged, which reduces overall battery 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 to ensure each reaches a preset voltage value, preventing unbalanced charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery modules are charged in series using a single charging circuit, then the charging process is simple and fast, but the charging becomes unbalanced and individual modules may not fully charge due to resistance differences
Solution Approach 1:
The charging system is segmented into a first charging circuit for series charging of all battery modules and multiple second charging circuits for individual module charging. This segmentation allows the system to perform both fast series charging and balanced individual charging, resolving the contradiction between charging speed and charging balance.
Solution Approach 2:
The system dynamically switches between series charging mode (using the first charging circuit) and individual module charging mode (using second charging circuits) based on the charging state of each module. This dynamic adjustment ensures both high productivity during series charging and reliability through balanced individual charging when needed.
2Reliability
If multiple independent charging circuits are used for each battery module, then charging balance is improved, but the device complexity increases
Solution Approach 1:
The system merges the functionality of multiple independent charging circuits by having the first charging circuit charge all modules in series while second charging circuits provide supplementary individual charging only when needed. This combining approach maintains charging balance while reducing overall system complexity compared to fully independent charging for each module.
Solution Approach 2:
The first charging circuit serves a universal function by charging all battery modules in series, while the second charging circuits provide multi-functional support by既可以 charging individual modules independently又可以 working in conjunction with the first charging circuit. This multi-functionality reduces the need for completely separate dedicated circuits for each module.
3Productivity
If series charging is used to charge all battery modules together, then the charging process is efficient, but individual modules with higher resistance do not reach full charge
Solution Approach 1:
The system incorporates feedback mechanisms that monitor the charging state of each individual battery module during series charging. When a module with higher resistance is detected to be lagging, the system activates the corresponding second charging circuit to provide additional charging, ensuring complete charging while maintaining overall efficiency.
Solution Approach 2:
The second charging circuits are prepared in advance and can be quickly activated to provide preliminary or supplementary charging to specific modules that are lagging during series charging. This preliminary action ensures that modules with higher resistance reach full charge without significantly impacting the overall charging efficiency.
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.