Battery Module Coupling Units for DC Bus Startup
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Solution Overview
Problem
Conventional battery systems for vehicles and stationary applications require high-capacity charging and disconnecting devices, which are expensive, large, and heavy, especially in mobile applications, due to the need for high DC voltage stabilization and charging current handling.
Innovation Solution
A method for starting up a battery system with a DC voltage intermediate circuit, where battery cells are connected in series with coupling units that allow incremental voltage increase, reducing the need for charging switches and resistors by disconnecting and reconnecting modules to achieve desired operating voltages efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-capacity charging and disconnecting device is used to stabilize DC voltage and handle charging current, then the voltage stabilization and current handling capability are improved, but the cost, volume, and weight of the system increase significantly
Solution Approach 1:
The battery system is divided into multiple series-connected battery modules, each with its own coupling unit. This segmentation allows the system to manage voltage and current in distributed stages rather than requiring a single high-capacity charging device to handle the entire system at once.
Solution Approach 2:
The coupling units are pre-configured in a disconnected state during system startup. By preliminarily disconnecting battery modules and then progressively connecting them as the DC voltage intermediate circuit charges, the system avoids the need for high-capacity charging components while maintaining safe voltage stabilization.
2Reliability
If a high-capacity charging and disconnecting device is used to stabilize DC voltage, then the voltage stabilization is improved, but the cost and volume of the system increase
Solution Approach 1:
The battery system is divided into multiple series-connected battery modules, each with its own coupling unit. This segmentation allows the system to manage voltage and current in distributed stages rather than requiring a single high-capacity charging device to handle the entire system at once.
Solution Approach 2:
The coupling units are pre-configured in a disconnected state during system startup. By preliminarily disconnecting battery modules and then progressively connecting them as the DC voltage intermediate circuit charges, the system avoids the need for high-capacity charging components while maintaining safe voltage stabilization.
3Power
If a high-capacity charging and disconnecting device is used to handle charging current, then the current handling capability is improved, but the volume and weight of the system increase
Solution Approach 1:
The battery system is divided into multiple series-connected battery modules, each with its own coupling unit. This segmentation allows the system to manage voltage and current in distributed stages rather than requiring a single high-capacity charging device to handle the entire system at once.
Solution Approach 2:
The coupling units are pre-configured in a disconnected state during system startup. By preliminarily disconnecting battery modules and then progressively connecting them as the DC voltage intermediate circuit charges, the system avoids the need for high-capacity charging components while maintaining safe voltage stabilization.
4Power
If battery cells are connected in series to achieve high output voltage, then the voltage capability is improved, but the risk of high DC voltage and the need for protective devices increase
Solution Approach 1:
The battery system is divided into multiple series-connected battery modules, each with its own coupling unit. This segmentation allows the system to manage voltage and current in distributed stages rather than requiring a single high-capacity charging device to handle the entire system at once.
Solution Approach 2:
The coupling units are pre-configured in a disconnected state during system startup. By preliminarily disconnecting battery modules and then progressively connecting them as the DC voltage intermediate circuit charges, the system avoids the need for high-capacity charging components while maintaining safe voltage stabilization.
Solution Approach 3:
The coupling units act as intermediary switching devices between battery modules and the DC voltage intermediate circuit. These intermediaries enable controlled connection and disconnection, managing high voltage risks by allowing progressive system startup and providing isolation capability when needed.
5Productivity
If the DC voltage intermediate circuit is charged rapidly to achieve fast startup, then the startup speed is improved, but the charging current becomes excessively high
Solution Approach 1:
The battery system is divided into multiple series-connected battery modules, each with its own coupling unit. This segmentation allows the system to manage voltage and current in distributed stages rather than requiring a single high-capacity charging device to handle the entire system at once.
Solution Approach 2:
The coupling units are pre-configured in a disconnected state during system startup. By preliminarily disconnecting battery modules and then progressively connecting them as the DC voltage intermediate circuit charges, the system avoids the need for high-capacity charging components while maintaining safe voltage stabilization.
Solution Approach 3:
The system employs periodic or sequential connection of battery modules through coupling units during startup. This staged approach allows the DC voltage intermediate circuit to charge progressively through multiple steps rather than requiring a single high-current charging event, achieving fast startup without excessive peak currents.
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 method reduces the costs, volume, and weight of the battery system while charging the DC voltage intermediate circuit more rapidly and incrementally, allowing for faster startup of the drive system with reduced maximum charging currents.
Implementation Method 1
The coupling unit (30, 50) has a first and a second state. In the first state, the coupling unit connects the series-connected battery cells (11) to one another and connects a first output to a first input. In the second state, the coupling unit disconnects the series-connected battery cells (11) from one another and disconnects the first output from the first input.
Implementation Method 2
A battery 110 is connected to a DC voltage intermediate circuit and said DC voltage intermediate circuit is embodied by a capacitor 111
Data Source
AI summary
The disclosure presents a method for starting up a battery system having a battery, a DC voltage intermediate circuit which is connected to the battery, and a drive system which is connected to the DC voltage intermediate circuit. The battery has a large number of battery modules which are connected in series and which each comprise a coupling unit and at least one battery cell which is connected between a first input and a second input of the coupling unit. The method comprises a step for decoupling the battery cells of all of the battery modules which are connected in series by outputting a corresponding control signal to the coupling units of the battery modules which are connected in series. All of the battery modules which are connected in series are then bridged at the output end, and therefore an output voltage of the battery is zero.