Battery Bypass Circuit With Co-Closing Prevention
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Solution Overview
Problem
Existing electrical storage systems face challenges in preventing short circuits during bypass operations due to malfunctions in control units, which can occur when the timing of control signals for disconnect and bypass switches is not properly sequenced.
Innovation Solution
A bypass circuit with a co-closing prevention unit that ensures the first and second switches are not simultaneously closed, utilizing a control circuit to manage the operation of disconnect and bypass switches, and safety switches to prevent short circuits by controlling the signal lines and switches' states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control unit sequences control signals for first and second switches to prevent short circuits, then short circuit prevention is improved, but system complexity increases due to additional control logic and timing requirements
Solution Approach 1:
A third switch is introduced as an intermediary component between the control unit and the first/second switches. This third switch acts as a mediator that physically isolates the bypass line from the electrical storage battery when in the open state, thereby preventing short circuits without requiring complex timing control logic in the control unit. The third switch simplifies the control unit's function while maintaining reliable short circuit prevention.
2Reliability
If operation interval and sequencing between first and second switches is enforced, then short circuit prevention is improved, but operational flexibility deteriorates due to strict timing constraints
Solution Approach 1:
The bypass control function is segmented into two independent parts: the third switch handles isolation safety by physically disconnecting the bypass line, while the first and second switches handle charge/discharge routing. This segmentation allows the third switch to operate independently with simple on/off control based on basic states of the first and second switches, eliminating the need for complex timing sequences and operation intervals, thereby improving operational flexibility while maintaining reliability.
3Reliability
If third switch is added to isolate bypass line, then short circuit prevention is improved, but device complexity increases due to additional switch component
Solution Approach 1:
The third switch replicates the isolation function that would otherwise require complex control logic in the control unit. By copying the safety isolation function into a dedicated hardware component (the third switch), the system achieves reliable short circuit prevention through a simple, fail-safe mechanical/electrical isolation mechanism rather than through complex software-controlled timing sequences.
Data Source
AI summary
There are provided a bypass circuit and an electrical storage system, the bypass circuit being provided in an electrical storage system including a plurality of electrical storage batteries connected in series and bypasses the electrical storage batteries. The bypass circuit includes: a first switch provided between the adjacent electrical storage batteries, the first switch being opened and closed in response to a first control signal output from a control circuit; a bypass line that bypasses the first switch and each of the electrical storage batteries; a second switch provided on the bypass line, the second switch being opened and closed in response to a second control signal output from the control circuit; and a co-closing prevention unit configured to prevent the first switch and the second switch from being in a closed state at the same time.