Alternating Battery Cell Charging Assemblies
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Solution Overview
Problem
The existing solutions for charging battery packs with multiple cells fail to effectively address the charging and discharging imbalance caused by differences in internal resistances, capacities, and self-discharge rates among battery cells, leading to complex circuits and higher costs without a comprehensive solution.
Innovation Solution
A charging device and system that utilizes multiple charging assemblies with AC/DC and DC/DC converters to charge alternating sets of battery cells in different time periods, ensuring that neighboring cells are from different sets, allowing for independent control and balanced charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery cells are assembled into a battery pack to provide sufficient power, then the power supply capacity is improved, but charging and discharging imbalance occurs due to parameter differences among battery cells
Solution Approach 1:
The battery pack is segmented into multiple independent charging units, each responsible for charging one or more battery cells. This segmentation allows independent control of charging parameters for each unit, enabling tailored charging strategies that compensate for parameter differences among cells, thus maintaining charging balance while achieving high power output.
Solution Approach 2:
The charging system dynamically adjusts charging parameters (such as charging current, voltage, and time period) based on real-time monitoring of battery cell states. By making the charging process dynamic and adaptive rather than static and uniform, the system can respond to parameter variations among cells, ensuring balanced charging while maintaining high power supply capacity.
2Reliability
If all battery cells are discharged before charging to reduce parameter differences, then charging balance is improved, but circuit complexity and cost increase
Solution Approach 1:
Instead of discharging all cells before charging, the system performs preliminary classification and grouping of battery cells based on their parameters. Cells with similar characteristics are grouped together and charged by the same charging unit, which simplifies the control logic and reduces circuit complexity while still achieving charging balance.
Solution Approach 2:
The charging system incorporates self-diagnosis and self-adjustment capabilities that allow it to automatically detect parameter differences among battery cells and adjust charging parameters accordingly. This self-service approach eliminates the need for complex external discharge circuits and manual balancing operations, reducing overall system complexity while maintaining charging balance.
3Reliability
If all battery cells are discharged before charging to reduce parameter differences, then charging balance is improved, but time consumption increases
Solution Approach 1:
The system performs preliminary classification of battery cells based on their parameters before charging begins. By pre-grouping cells with similar characteristics, the system avoids time-consuming discharge operations and can proceed directly to targeted charging, significantly reducing total charging time while maintaining charging balance.
Solution Approach 2:
The charging system dynamically monitors battery cell states during charging and adjusts parameters in real-time to maintain balance. This dynamic approach allows the system to achieve charging balance during the charging process itself rather than requiring time-consuming pre-discharge operations, thereby reducing overall time consumption while ensuring charging balance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient and balanced charging of battery cells, reducing the need for complex circuits and higher costs while effectively addressing the imbalance issues, leading to improved battery pack performance.
Implementation Method 1
an AC/DC converter for converting an inputted AC voltage to a first DC voltage
Implementation Method 2
a DC/DC converter for converting the first DC voltage to a second DC voltage for charging the battery cell
Data Source
AI summary
A charging device for charging a battery pack includes a plurality of charging assemblies for charging a plurality of battery cells connected electrically in series, wherein the plurality of charging assemblies are configured to charge a first set of the plurality of battery cells in a first time period and a second set of the plurality of battery cells in a second time period, any two of the plurality of battery cells that neighbor with each other are from different sets of the plurality of battery cells, and each of the plurality of charging assemblies comprises: an AC/DC converter for converting an inputted AC voltage to a first DC voltage; and a DC/DC converter for converting the first DC voltage to a second DC voltage for charging the battery cell.