DC-DC Converter Voltage Detection Circuit Battery Equalization
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Solution Overview
Problem
In lithium ion battery systems, achieving voltage and capacity equalization across multiple cells connected in series is challenging due to unequal power consumption in voltage detection circuits, leading to increased circuit complexity and cost, especially when high voltages are involved.
Innovation Solution
A power storage unit incorporating a voltage detection circuit, a DC-DC converter, and an adjustment circuit that uses the converted DC voltage to equalize power consumption across cells, minimizing circuit scale and cost by employing a DC-DC converter to stabilize the power supply and reduce heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge circuit with resistor and switch is connected to both ends of the assembled battery to adjust power consumption, then the voltages and remaining capacities of the assembled batteries are equalized, but when both-end voltage is high, power consumed in the resistor becomes high causing large heat generation, requiring high voltage resistant protection and heat resistant protection which increases circuit scale and cost
Solution Approach 1:
The patent introduces a DC-DC converter as an intermediary device between the assembled battery and the adjustment circuit. The converter transforms the high-voltage direct current from the battery into a standardized low-voltage DC output, which then powers the adjustment circuit. This mediator isolates the adjustment circuit from high voltage stress, eliminating the need for expensive high-voltage resistant components while maintaining the ability to equalize battery voltages and capacities.
2Stability of the object's composition
If power consumptions in the voltage detection circuits are not equal, then the voltages or remaining capacities in the assembled batteries become not equal, but adding a discharge circuit to adjust power consumption increases circuit complexity and cost
Solution Approach 1:
The patent changes the voltage parameter by using a DC-DC converter to transform the high-voltage battery output into a standardized low-voltage DC output. This parameter transformation allows the adjustment circuit to operate at safe, standardized voltage levels while still achieving the desired effect of equalizing power consumption across multiple battery assemblies, thereby maintaining voltage and capacity balance without increasing circuit complexity.
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 solution effectively equalizes voltage and capacity across power storage units while minimizing circuit size and cost, ensuring efficient and reliable operation without the need for large, high-voltage resistant components.
Implementation Method 1
a DC-DC converter that converts a voltage between both ends of the plurality of cells into another DC voltage
Data Source
AI summary
A voltage detection circuit detects the voltage of a plurality of serially connected cells in a power storage unit. The voltage detection circuit receives a supply of a power supply voltage from both ends of the plurality of cells. A DC-DC converter converts the voltage between both ends of the plurality of cells into another DC voltage. An adjustment circuit adjusts the power consumption of the plurality of cells. The adjustment circuit operates using the DC voltage generated by the DC-DC converter as the power supply voltage.