Dual-Module Battery Charging Control for Mixed-Material Packs
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Solution Overview
Problem
Batteries with two battery modules made of different materials face slow charging speeds due to the need to use a smaller maximum charging rate to ensure safety, as the modules have different charging capabilities.
Innovation Solution
A control method that adjusts charging rates based on the state parameter of the first battery module, forming a higher charging loop when the parameter is below a threshold and switching to a lower rate when it exceeds the threshold, allowing simultaneous charging of both modules at different rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If two battery modules made of different materials are arranged in a battery to improve the range, then the range is improved, but the charging speed becomes slow due to having to use a smaller maximum charging rate
Solution Approach 1:
The battery is divided into two independent battery modules (first battery module and second battery module) that can be charged independently. The control device separately manages the charging process for each module, allowing them to operate at their respective optimal charging rates without being constrained by the limitations of the other module. This segmentation enables the battery system to achieve both extended range (through multiple modules) and maintained charging speed (through independent charging control).
Solution Approach 2:
The charging system dynamically adjusts the charging rates for each battery module based on their respective states. The control device monitors the state parameters of both modules and independently controls their charging rates, allowing the system to optimize charging speed for each module according to its material characteristics and current state, rather than using a fixed conservative rate for both modules simultaneously.
2Reliability
If a smaller maximum charging rate is used to ensure charging safety for both battery modules, then charging safety is ensured, but the charging speed becomes slow
Solution Approach 1:
Each battery module is assigned its own optimal charging rate based on its specific material characteristics and safety requirements. The first battery module can operate at a higher charging rate suitable for its material, while the second battery module operates at a lower charging rate appropriate for its material. This local optimization of charging parameters allows each module to charge at its maximum safe rate, simultaneously ensuring charging safety and maximizing overall charging speed.
Solution Approach 2:
The system changes the charging rate parameter independently for each battery module based on their respective state parameters and material properties. Instead of using a single conservative charging rate for both modules, the control device adjusts the charging rates to match the specific requirements of each module, thereby achieving both safety and speed optimization through parameter adaptation.
Data Source
AI summary
A control method of a battery apparatus includes acquiring a state parameter of a first battery module of the battery apparatus, controlling the first battery module and a charging device to form a first charging loop in response to the state parameter of the first battery module being less than a preset threshold, and controlling the first battery module, a second battery module of the battery apparatus, and the charging device to be connected in series to form a second charging loop in response to the state parameter of the first battery module being greater than or equal to the preset threshold. A charging rate of the first charging loop is higher than a charging rate of the second charging loop.