Power Supply Control Device for Parallel Battery Safety
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Solution Overview
Problem
In vehicles with multiple battery packs connected in parallel, there is a risk of forming a high-voltage circuit if the ignition switch is turned on by mistake, leading to potential short circuits and electrical shocks during service work, as the safety switches may not all be in the correct state to break the circuit.
Innovation Solution
A control device that includes voltage sensing units to detect changes in internal voltages across safety switches, ensuring all relays remain open, thereby preventing the formation of a high-voltage circuit even if one safety switch is inadvertently turned off, thus maintaining safety during service operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs are connected in parallel to increase power capacity, then the power output and running distance are improved, but the risk of short circuit and electrical shock during service work increases
Solution Approach 1:
The control device continuously monitors the ON/OFF states of all safety switches through voltage sensing units and automatically adjusts relay states based on this feedback. When any safety switch is detected as OFF, the control device responds by opening all relays to prevent harmful electrical circuits, creating a closed-loop safety system that adapts to real-time switch states
Solution Approach 2:
The control device acts as an intermediary between safety switches and relays, mediating the control relationship. Instead of direct control where relay states depend only on ignition switch position, the control device introduces itself as a intermediary that processes safety switch states and determines appropriate relay actions, thereby preventing harmful circuits even when ignition is accidentally turned ON
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 control device effectively reduces the risk of work-related hazards by ensuring the high-voltage circuit is broken, even if the ignition switch is mistakenly turned on, thereby enhancing safety and convenience during service work on vehicles with parallel battery packs.
Implementation Method 1
a voltage sensing unit that senses an internal voltage to detect a voltage change based on the operation of one or more safety switches
Data Source
AI summary
In a control device for a power supply circuit in which a plurality of high-voltage battery packs are provided, if any one of safety switch is off, the startup state of a high-voltage circuit is totally prevented, even when a careless mistake such as a careless power-on (ON) operation is made, the circuit is prevented from being started, and also the overall power supply is cut off by turning off (OFF) one safety switch, thereby improving the convenience of work. Voltage sensing units (9-1 to 9-n) that sense internal voltages are provided in battery packs (4-1 to 4-n) to detect a voltage change based on the operation of one or more safety switches (8-1 to 8-n) and maintain all relays (5-1 to 5-n) of the plurality of battery packs (4-1 to 4-n) provided in parallel in an open (OPEN) state.