Lawn Mower Battery Slot Shielding for Shock-Safe Parallel Packs
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Solution Overview
Problem
Existing electric lawn mowers using multiple battery packs in parallel configurations face safety risks due to exposed conductive electrode sheets that can cause electric shocks when one battery pack is connected but the other is not.
Innovation Solution
A shielding mechanism is introduced that moves relative to the conductive electrode sheets, shielding them when no battery pack is inserted and exposing them only when a battery pack is connected, using an elastic member to apply a restoring force and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multiple battery packs are connected in parallel to extend usage time, then the duration of action is improved, but the safety deteriorates due to exposed conductive electrode sheets causing electric shock risks
Solution Approach 1:
The shielding mechanism is activated in advance before battery pack insertion. The elastic member maintains the shielding plate in a closed position that covers the conductive electrode sheets, preventing electric shock risks before they can occur. This preliminary protective action ensures safety is established prior to any potential hazard.
Solution Approach 2:
The shielding plate serves as an intermediary element between the exposed conductive electrode sheets and the user environment. This intermediate structure physically blocks access to the electrified electrode sheets when no battery pack is present, eliminating the direct hazard while allowing normal operation when a battery pack is properly inserted.
2Ease of operation
If conductive electrode sheets are exposed for battery pack connection, then the ease of operation is improved, but the safety deteriorates due to electric shock hazards
Solution Approach 1:
The shielding mechanism transitions from a static closed state to a dynamic state that opens automatically upon battery pack insertion. The elastic member enables the shielding plate to move freely between closed (safety) and open (operation) positions, adapting the system's protective behavior based on operational conditions without requiring manual intervention.
Solution Approach 2:
The shielding mechanism is self-actuating through the elastic member that automatically responds to battery pack insertion. When a battery pack is inserted, it directly pushes the shielding plate open, eliminating the need for separate control mechanisms or user actions to expose the electrode sheets for connection.
3Reliability
If the shielding mechanism is added to protect conductive electrode sheets, then the safety is improved, but the device complexity increases
Solution Approach 1:
The shielding mechanism is segmented into distinct functional components: the shielding plate for coverage, the elastic member for actuation, and the mounting structure for integration. This segmentation allows each component to perform its specific function efficiently and enables independent optimization or replacement of individual parts without affecting the entire system.
Solution Approach 2:
The shielding plate serves multiple functions simultaneously: it provides safety coverage for exposed electrode sheets, acts as a structural element within the battery pack accommodating cavity, and serves as the interface for battery pack insertion detection. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
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 shielding mechanism effectively prevents accidental electric shocks by ensuring the conductive electrode sheets are shielded when not in use, enhancing the safety of the electric lawn mower.
Implementation Method 1
an elastic member, configured to apply a restoring force to the shielding mechanism, to provide the shielding mechanism with a tendency of moving toward the protection state or maintaining the protection state
Data Source
Figure 1
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Figure 4~5
AI summary
An electric lawn mower includes: a body (1); a cutting element (2) disposed on the body (1) and a driving assembly (6) driving the cutting element; a battery pack accommodating cavity (51) provided with conductive electrode sheets (53) for insertion of at least two battery packs (7); a shielding mechanism (52) provided in the battery pack accommodating cavity (51) and being movable relative to the conductive electrode sheet (53), where the shielding mechanism (52) has a protection state of shielding the conductive electrode sheet and a working state of releasing shielding of the conductive electrode sheet to expose the conductive electrode sheet; and an elastic member (9) disposed between an inner wall of the battery pack accommodating cavity and the shielding mechanism and configured to apply a restoring force to the shielding mechanism (52), to provide the shielding mechanism with a tendency of moving toward the protection state or maintaining the protection state. The electric lawn mower can avoid an electric shock accident caused by accidental touch of the conductive electrode sheet, and has good safety performance. An electric wheeled vehicle, a battery device, and an electric tool are also provided.