Battery Unit Overcurrent Protection via Switching Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In assembled battery systems connected in parallel, overcurrents can occur when a battery is reconnected during maintenance or when the power supply is shut down, leading to damage in circuit elements due to voltage differences and floating capacitors.
Innovation Solution
A battery unit with a switching unit and control unit that detects voltage differences between the power supply line and the battery cell group, initially connecting through a resistance path to manage overcurrents and then switching to a normal path when voltage differences are within predetermined limits, preventing circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery unit is directly connected to the power supply line without overcurrent protection, then the connection is simple and fast, but overcurrent can damage circuit elements during reconnection or power supply changes
Solution Approach 1:
An overcurrent protection circuit is introduced as an intermediary component between the battery unit and the power supply line. This protection circuit includes current limiting elements that restrict excessive current flow during abnormal conditions such as reconnection or power supply changes, thereby protecting circuit elements without requiring fundamental changes to the connection structure
Solution Approach 2:
The overcurrent protection circuit is pre-configured and activated before abnormal current conditions occur. During battery unit reconnection or power supply changes, the protection circuit proactively limits current flow before overcurrent can damage circuit elements, rather than reacting after damage occurs
2Power
If multiple battery units are connected in parallel to increase current capacity, then the power supply capability is improved, but voltage differences between units can cause overcurrent when units are reconnected
Solution Approach 1:
Each battery unit is equipped with its own independent overcurrent protection circuit rather than a centralized protection system. This allows each unit to independently manage its own current flow and voltage differences, preventing overcurrent issues when units are reconnected to the parallel configuration
Solution Approach 2:
The battery system is divided into independent battery units, each with its own protection circuitry. This segmentation allows individual units to be reconnected or disconnected without affecting the operation of other units, and each unit's protection circuit handles voltage differences locally
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
Effectively prevents overcurrent damage to circuit elements by managing voltage differences and current flows during reconnection and power supply changes, ensuring safe operation and extending battery unit lifespan.
Implementation Method 1
a resistance path including a protection resistor that provides the resistance path with a higher resistance value than that of the normal path
Data Source
AI summary
Techniques effectively prevent an overcurrent from occurring in a system comprising assembled batteries connected in parallel to a power supply line, when a given assembled battery is connected to the power supply line. Multiple battery units are each configured such that they can be connected to a power supply line. Each battery unit includes a battery cell group configured including multiple battery cells, a switching unit arranged between the power supply line and the battery cell group so as to control a current that flows between the power supply line and the battery cell group, and a control unit that controls the switching unit.