Battery Rack Parallel Layout With Low-Capacity Voltage Conversion
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Solution Overview
Problem
Connecting old and new battery racks in parallel in a battery pack leads to impedance imbalance, requiring large and costly power conversion circuits, increased power consumption, and space constraints.
Innovation Solution
A battery pack design that connects old and new battery racks in parallel using a low-capacity power conversion circuit, allowing for efficient voltage conversion and reducing the need for large conversion capacity, thereby minimizing size, cost, and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If old and new battery racks are connected in parallel, then battery pack capacity is extended, but impedance imbalance occurs requiring large power conversion circuits
Solution Approach 1:
The battery pack is segmented into multiple independent battery racks (first battery rack and second battery rack) that can be connected in parallel. Each rack operates semi-independently with its own voltage characteristics, allowing capacity extension without requiring a single large power conversion circuit to handle the entire pack's impedance variations.
Solution Approach 2:
The power conversion circuit dynamically adjusts voltage levels for each battery rack based on their individual state of charge and impedance characteristics. The controller modifies conversion ratios in real-time to balance the parallel-connected racks with different impedance levels, enabling effective parallel operation without oversized circuitry.
2Adaptability or versatility
If large power conversion circuits are used to handle impedance imbalance, then battery rack parallel connection is enabled, but power consumption increases
Solution Approach 1:
The system changes operational parameters (voltage conversion ratios, current distribution) based on the state of charge and impedance of each battery rack. By dynamically adjusting these parameters, the power conversion circuit operates at optimal efficiency points, reducing overall power consumption while maintaining the ability to connect racks in parallel.
3Reliability
If large power conversion circuits are used, then impedance balance is achieved, but space requirements and heat generation increase
Solution Approach 1:
The power conversion function is segmented across multiple smaller conversion stages, each handling a specific battery rack or group of racks. This segmentation allows the use of compact conversion circuits with lower individual capacities, reducing total space requirements while maintaining impedance balance through coordinated control of each segment.
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
The solution effectively balances the power conversion needs of old and new battery racks, reducing the size and cost of the power conversion circuit while minimizing heat generation and space requirements.
Implementation Method 1
The first power conversion circuit may further include an additive-polarity transformer including a primary coil connected between the first terminal and the second terminal and a secondary coil connected between the third terminal and the fourth terminal
Data Source
AI summary
A battery pack includes a first battery rack, a first power conversion circuit, a second battery rack, and a battery controller. The first battery rack is connected between a first pack terminal and a second pack terminal of the battery pack. The first power conversion circuit includes a first terminal, a second terminal, a third terminal, and a fourth terminal that is connected to the second pack terminal, and the first power conversion circuit is configured to bidirectionally convert a first conversion voltage between the first terminal and the second terminal into a second conversion voltage between the third terminal and the fourth terminal. The second battery rack is connected between the first pack terminal and the third terminal of the first power conversion circuit. The battery controller is configured to control the first power conversion circuit to adjust a level of the second conversion voltage.