Battery Test DC Bus Architecture for Regenerative Power Reuse
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Solution Overview
Problem
Existing charging and discharging test systems for secondary batteries, such as lithium-ion batteries, face challenges in reducing power consumption and cost while efficiently testing multiple batteries concurrently, due to increased battery capacity demands and complex control requirements.
Innovation Solution
A charging and discharging test device that includes an AC/DC converter, bidirectional DC/DC converters, a storage battery, an auxiliary power generation means, and a control unit, which allows for repeated reuse of energy by storing and reusing DC regenerative power, reducing the need for commercial AC power and minimizing power conversion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power is supplied from grid power to charge multiple secondary batteries for testing, then charging and discharging tests can be conducted, but power consumption amount becomes large and cost reduction is limited
Solution Approach 1:
Multiple bidirectional DC/DC converters are connected to a common DC bus, allowing them to share power resources. The system merges power supply and regenerative power from multiple battery test channels into a unified power management architecture, enabling efficient power distribution and reducing overall power consumption.
Solution Approach 2:
The system captures regenerative power (energy that would otherwise be wasted) from discharging batteries and converts it into usable power for charging other batteries. This transforms the harmful waste energy into a beneficial resource, significantly reducing grid power consumption and testing costs.
2Loss of energy
If bidirectional DC/DC converters are connected to DC bus for power exchange, then regenerative power is reduced and AC conversion loss is reduced, but complicated control scheduling is required to minimize regenerative power
Solution Approach 1:
The control device automatically manages power flow between batteries and the DC bus without requiring complex external scheduling. The system self-regulates by directing regenerative power from discharging batteries to charging batteries, eliminating the need for complicated control algorithms to minimize regenerative power.
Solution Approach 2:
The DC bus serves multiple functions simultaneously: it supplies power to charging batteries, receives regenerative power from discharging batteries, and maintains voltage stability. This multi-functional design simplifies control by providing a universal power exchange platform for all test channels.
3Power
If storage battery is connected to DC bus, then peak power of AC regenerative power supply is lowered and scale reduction is achieved, but specific description of storage battery operation is unclear
Solution Approach 1:
The storage battery is pre-charged from grid power before testing begins. This preliminary charging action prepares the storage battery to serve as a power source during testing, allowing it to supply peak power demands and reduce the required capacity of the AC regenerative power supply.
Solution Approach 2:
The storage battery acts as an intermediary energy buffer between the grid power supply and the battery test channels. It mediates power flow by storing excess energy and releasing it when needed, smoothing out peak power demands and simplifying the overall power supply architecture.
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 significantly reduces power consumption and costs by reusing energy stored in the battery, eliminates conversion losses of regenerative power, and ensures stable power supply during tests, thereby enabling efficient and cost-effective service life evaluations of multiple secondary batteries.
Implementation Method 1
a storage battery connected to the common DC bus
Implementation Method 2
an auxiliary power generation means connected to the common DC bus
Data Source
AI summary
A charging and discharging test device comprises an AC/DC converter having an AC-side terminal connected to a commercial AC power supply and a DC-side terminal connected to a common DC bus, a plurality of bidirectional DC/DC converters each having one end connected to the common DC bus and another end connected to each test object in which a plurality of secondary batteries are connected in series, a storage battery and an auxiliary power generation means connected to the common DC bus, and a control unit which controls each bidirectional DC/DC converter. At the time of charging and discharging of each test object, transmission and reception of power are performed between each test object and the storage battery, and a shortage in power of the storage battery is supplemented with power generated by the auxiliary power generation means.