Jump Starter Safety Switch Circuit for High-Current Polarity Protection
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Solution Overview
Problem
Existing jump starters and air compressors face challenges in delivering high current safely to vehicle batteries, particularly in cold weather, and existing safety switches are either bulky or prone to malfunction, while prior art solutions for preventing incorrect connections are complex or costly.
Innovation Solution
A portable device combining a jump starter and air compressor with a thermally optimized battery configuration, using a safety switch with a primary relay and secondary FETs in parallel to manage current, and a system for detecting battery polarity and presence to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay is used as the safety switch, then durability is improved, but device size increases and switching speed decreases
Solution Approach 1:
The patent divides the safety switch into two separate components: a relay for durability and FETs for compactness and speed. This segmentation allows each component to excel at its specific function while overcoming the limitations of using a single switch type.
Solution Approach 2:
The patent combines relay and FETs in parallel within the same safety switch circuit. This merging allows the system to leverage both the durability of relays and the compact size/fast switching of FETs, resolving the contradiction between size and reliability.
2Volume of moving object
If FETs are used as the safety switch, then device size decreases and switching speed increases, but thermal stability decreases
Solution Approach 1:
The patent segments the current handling duties between relay and FETs, with the relay handling the main high-current path and FETs providing supplementary switching capability. This segmentation reduces thermal load on the FETs while maintaining compact size.
Solution Approach 2:
By merging relay and FETs in parallel, the system distributes thermal load across both components. The relay's superior thermal handling capability compensates for the FETs' thermal limitations, while FETs provide fast switching and compact form factor.
3Power
If high current is delivered to jump start vehicle battery, then jump starting capability is improved, but conductor and switching device damage risk increases
Solution Approach 1:
The patent implements polarity detection and safety switching mechanisms that activate before high current flows. These preventive measures detect potential hazards and prevent damage before it occurs, cushioning against the inherent risks of high-current operation.
Solution Approach 2:
The patent uses intermediary safety circuits including polarity detection, control circuits, and protective switching mechanisms that mediate between the power source and the high-current load. These intermediaries monitor and control current flow to prevent conductor and switching device damage.
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 device efficiently delivers high current to vehicle batteries while preventing incorrect connections and overheating, ensuring safe and reliable operation in various conditions.
Implementation Method 1
A plurality of first heat sinks are connected to one or more of the plurality of first rechargeable battery cells and maintain contact with the one or more first rechargeable battery cells during an expansion of the first rechargeable battery cells
Data Source
AI summary
Systems and methods are provided for a rechargeable battery that includes a plurality of first rechargeable battery cells on a first side of the rechargeable battery and a plurality of second rechargeable battery cells on a second side of the rechargeable battery. A plurality of first heat sinks are connected to one or more of the first rechargeable battery cells. The plurality of first heat sinks maintain contact with the one or more first rechargeable battery cells during an expansion of the first rechargeable battery cells. A plurality of second heat sinks are connected to one or more of the second rechargeable battery cells and maintain contact with the one or more second rechargeable battery cells during an expansion of the second rechargeable battery cells. An enclosure surrounds the first rechargeable battery cells, the second rechargeable battery cells, the first heat sink, and the second heat sink.