Battery Pack Ventilation Recesses for Hand Tool Cooling
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Solution Overview
Problem
Air-cooled rechargeable battery packs for hand-held electrical power tools face issues with metallic dust and moisture infiltration through ventilation recesses, leading to short circuits and corrosion, while sealed designs prevent effective cooling, resulting in overheating and reduced power output.
Innovation Solution
A battery pack design with ventilation recesses that direct airflow to separate battery cell poles, using a cell carrier with closed side walls and a detachable housing part with air-conducting elements to prevent particle and moisture ingress, while allowing heat dissipation and incorporating a pressure compensation device and integrated fuse area for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ventilation recesses are provided for air cooling, then cooling efficiency is improved, but metallic dust and moisture infiltration increases
Solution Approach 1:
The battery pack is divided into separate compartments: an air-permeable section for cooling and a sealed section for housing electronic components and battery poles. This segmentation allows different parts of the battery pack to have different sealing requirements, enabling effective cooling while protecting sensitive areas from dust and moisture infiltration.
Solution Approach 2:
Different parts of the battery pack are given different sealing properties: the housing is sealed in areas where electronic components and battery poles are located, while ventilation recesses are provided in areas where cooling is needed. This local differentiation of sealing quality allows the battery pack to simultaneously achieve cooling efficiency and protection from harmful factors.
2Reliability
If battery cells are spaced apart to reduce short circuit risk, then safety is improved, but power output decreases
Solution Approach 1:
Instead of increasing horizontal spacing between battery cells, the invention uses vertical separation through a divided housing structure. The first housing part contains battery cells at certain positions, while the second housing part contains electronic components and battery poles at different vertical levels. This dimensional approach maintains compact overall size while achieving effective separation for short circuit prevention.
3Object-affected harmful factors
If housing is sealed to protect from dust and moisture, then protection is improved, but cooling efficiency decreases
Solution Approach 1:
The housing is segmented into multiple parts with different sealing characteristics. The first housing part is air-permeable to allow cooling airflow, while the second housing part is sealed to protect electronic components and battery poles from dust and moisture. This segmentation resolves the contradiction by applying different sealing strategies to different functional areas.
Solution Approach 2:
The housing structure implements local quality differentiation where specific regions are sealed and others are vented. The sealed regions protect sensitive components, while the vented regions provide cooling pathways. This localized approach to sealing quality allows simultaneous achievement of protection and cooling efficiency.
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
This design effectively reduces the risk of short circuits and corrosion, maintains efficient cooling, and extends the battery pack's service life by preventing particle and moisture contact with sensitive areas while ensuring heat dissipation and cost-effective production.
Implementation Method 1
The housing has ventilation recesses, by means of which cooling air from the environment can reach the housing interior and can be dissipated back into the environment
Implementation Method 2
a structure for conducting air and separating the pole areas of the battery cells can be provided in the interior of the housing
Data Source
AI summary
The invention relates to a rechargeable battery pack, in particular for a hand-held electrical power tool, comprising: at least two rechargeable battery cells and/or rechargeable battery cell blocks, which are connected in series or in parallel, a housing with a cell carrier for receiving the rechargeable battery cells and/or rechargeable battery cell blocks in rows arranged one above the other, and a printed circuit board, wherein the rechargeable battery cells are connected to the printed circuit board via conductor plates when the rechargeable battery packs are in the installed state, and wherein at least one of the conductor plates at least partially surrounds at least two conductor plate layers when the rechargeable battery pack is in the assembled state with the printed circuit board.