Nested Battery Pack Housing for Balanced Power Tools

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Solution Overview

Problem

Battery-powered tools face issues with battery pack exposure to impacts, leading to damage or disconnection, and ergonomic imbalances due to varying battery pack sizes, which affect user comfort and tool stability.

Innovation Solution

A battery-powered tool design featuring a tool body with a through aperture that surrounds the battery pack, providing protection and allowing for easy access, with a locking mechanism and connectors for secure power transfer, and adjustable protrusion to maintain balance across different battery pack sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the battery pack is mounted exposed underneath the tool body, then easy accessibility is achieved, but the battery pack becomes vulnerable to impacts and damage

Engineering Contradiction:

Improvebattery accessibilityVSAvoidimpact exposure

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The battery pack is nested within the tool body housing, with the housing forming a protective cavity that receives and surrounds the battery pack. This nesting arrangement protects the battery from impacts while keeping it accessible through the housing structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The housing is designed with a protective shell structure that surrounds the battery pack, providing mechanical protection while maintaining access. The housing acts as a protective barrier against impacts from rough environments.

Inventive Principle:

Principle #30Flexible shells and thin films

2Object-affected harmful factors

If the battery pack is mounted inside the tool body, then protection from impacts is achieved, but accessibility and removal effort increase significantly

Engineering Contradiction:

Improveimpact protectionVSAvoidbattery accessibility

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The battery pack is nested within the tool body housing in a way that allows easy access. The housing structure is designed to accommodate the battery pack while enabling simple removal and installation operations.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The battery pack can be easily extracted from the housing through the protective structure. The housing design includes features that allow the battery to be taken out without excessive effort, maintaining accessibility while providing protection.

Inventive Principle:

Principle #2Taking out (Extraction)

3Power

If a larger battery pack is used to increase power, then power capability is improved, but weight balance and ergonomics deteriorate

Engineering Contradiction:

Improvebattery power capabilityVSAvoidtool weight balance

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The housing structure is designed with localized support features and structural reinforcement at specific areas to distribute and balance the weight of larger battery packs. This allows the tool to accommodate higher power batteries while maintaining ergonomic balance through strategic structural design.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3756834B1Battery powered tool

Publication Date: 2021.12.08 HUSQVARNA AB

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AI summary

The present disclosure relates to a battery powered tool (1) extending in a longitudinal direction (Z), comprising a tool body (10) and a battery pack (20), which battery pack is arranged on the tool body and adapted to power the tool. The tool body is provided with a through aperture adapted to receive the battery pack, such that the tool body at least partly surrounds the battery pack.