Battery DC-DC Circuit Voltage Matching Sodium Ion
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Solution Overview
Problem
The wide discharge voltage range of sodium ion batteries conflicts with the narrow working voltage range of loads, leading to inefficiencies and potential damage due to undervoltage or overvoltage triggers, necessitating a solution to maximize cell capacity utilization while simplifying control and reducing costs.
Innovation Solution
A battery system incorporating a cell group, processor, and DC-DC conversion circuit that adjusts discharge modes based on open-circuit voltage or state of charge to match discharge voltage with load requirements, using amplitude limiting and discharge curves to ensure efficient power supply within the load's voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sodium ion battery is used to provide wide discharge voltage range, then material cost and low-temperature performance are improved, but compatibility with load voltage requirements deteriorates
Solution Approach 1:
A DC-DC conversion circuit is introduced as an intermediary device between the sodium ion battery and the load. This mediator transforms the wide discharge voltage range (1.5V-4.0V) of the sodium ion battery into a stable output voltage that matches the narrow working voltage range of the load, resolving the incompatibility while preserving the benefits of sodium ion battery technology
Solution Approach 2:
The patent changes the voltage parameter through the DC-DC conversion circuit, which dynamically adjusts the output voltage based on the battery's discharge characteristics. By converting the steep Vocv-SOC curve into a stable voltage output, the system maintains load compatibility throughout the discharge process
2Reliability
If DC-DC conversion circuit is used to match voltage ranges, then load compatibility is improved, but system complexity and cost increase
Solution Approach 1:
The DC-DC conversion circuit operates autonomously based on pre-stored discharge curve data. The processor determines whether the battery is in the first or second discharge mode by comparing the discharge voltage with the stored curve, eliminating the need for complex real-time control algorithms or additional sensors
Solution Approach 2:
The discharge curve data is pre-stored in the processor during system initialization or manufacturing. This preliminary preparation allows the control system to quickly determine the appropriate discharge mode without performing complex calculations in real-time, thereby simplifying the control logic
3Quantity of substance
If first discharge mode is used based on discharge curve, then capacity utilization is improved, but voltage control precision deteriorates
Solution Approach 1:
The discharge process is segmented into two distinct modes: the first discharge mode for normal operation with higher voltage control precision, and the second discharge mode for maximizing capacity utilization. This segmentation allows each mode to optimize for its specific function without compromise
4Reliability
If second discharge mode is used based on specified voltage, then voltage stability is improved, but capacity utilization deteriorates
Solution Approach 1:
The system dynamically switches between the first and second discharge modes based on the battery's state of charge and discharge curve characteristics. This dynamic adjustment allows the system to maintain voltage stability when necessary while maximizing capacity utilization during other phases of discharge
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 enhances discharge efficiency by minimizing high-frequency switching, reduces power conversion losses, and maintains efficient energy utilization across varying load conditions, thus optimizing battery performance and reducing heat generation.
Implementation Method 1
a DC-DC conversion circuit, to complete charging, discharging, and electric energy exchanging with the outside
Data Source
Figure 1~2
Figure 3
Figure 4a
AI summary
Embodiments of this application provide a battery and a power consumption system. After the battery is connected to a load, to make full use of an available capacity of a cell group, a processor in the battery may determine an open-circuit voltage of the cell group or a state of capacity of the cell group. A DC-DC conversion circuit supplies power to the load in a first discharge mode or a second discharge mode based on the determined open-circuit voltage of the cell group or the determined state of capacity of the cell group. The first discharge mode is supplying power to the load based on a discharge curve of the cell group, the second discharge mode is supplying power to the load based on a first specified voltage, and the first specified voltage is within a working voltage range of the load.