Explosive Area Blower Filter with Cast Lithium-Ion Battery Pack
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Solution Overview
Problem
Blower filter systems for potentially explosive environments are hindered by the weight and bulk of nickel-metal hydride or nickel-cadmium battery packs, which increase user burden and compromise freedom of movement due to the need for multiple cells to achieve adequate operation times, while also posing ignition risks from spark or self-heating issues.
Innovation Solution
A blower filter system utilizing a battery pack with high energy density lithium-ion or lithium-manganese cells, cast in a heat-conductive and electrically insulating material, combined with protective circuits for current and temperature management, to reduce weight and size while preventing ignition risks through redundant cutoffs and heat dissipation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If nickel-metal hydride or nickel-cadmium battery packs are used to achieve adequate operation times, then the system can operate for extended periods, but the weight and size of the battery pack increase significantly
Solution Approach 1:
The patent changes the chemical composition and energy density parameters of the battery cells by using lithium-ion or lithium-manganese cells instead of traditional nickel-metal hydride or nickel-cadmium cells. This parameter change achieves higher energy density, allowing extended operation times with reduced weight and size.
2Duration of action of moving object
If multiple battery cells are used to extend operation time, then the system can run longer, but the bulk and unwieldiness of the system increase
Solution Approach 1:
The patent changes the energy density parameter by adopting lithium-ion or lithium-manganese battery cells, which provide higher energy per unit volume. This allows the system to achieve extended operation times with a more compact battery pack configuration, reducing overall system bulk.
3Weight of moving object
If high energy density lithium-ion or lithium-manganese cells are used, then weight and size are reduced, but ignition risks from heat buildup and electrical sparks increase
Solution Approach 1:
The patent introduces protective circuits as an intermediary component between the high energy density battery cells and the external environment. These circuits include temperature monitoring, overcharge protection, and short-circuit prevention mechanisms that mediate the harmful effects of heat buildup and electrical sparks, thereby reducing ignition risks.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating protective circuits that anticipate and prevent harmful conditions before they can cause ignition. The circuits include temperature monitoring and overcharge protection that act in advance to cushion against potential ignition risks from heat buildup and electrical sparks.
4Object-affected harmful factors
If traditional battery cells are used, then ignition risks are lower, but the system becomes heavier and bulkier
Solution Approach 1:
The patent changes the battery cell type parameter to high energy density lithium-ion or lithium-manganese cells, which reduce weight and size. Combined with protective circuits that control temperature and electrical parameters, this parameter change achieves both reduced weight and maintained safety against ignition risks.
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 system achieves prolonged operation times with reduced weight and size, effectively managing heat and electrical risks to prevent ignition, ensuring safe and efficient operation in explosive environments.
Implementation Method 1
cast in a heat-conductive and electrically insulating material
Implementation Method 2
cast in a heat-conductive and electrically insulating material
Data Source
AI summary
A blower filter system includes a blower unit (11), an electric motor (24) for driving a blower impeller, a control unit (27) for controlling the electric motor, contacts (22, 23) for connecting to a battery pack, and a battery pack (10) with secondary cells (12) with high energy density and contacts (22, 23) for connecting to the blower unit. The blower unit (11) can be detachably coupled to the battery pack (10). The battery pack is electrically connected to the blower unit via the contacts. The battery pack (10) has protective circuits including electronic components (15, 16, 17, 18, 19, 20, 21, 31) to electrically switch off at least one of the plurality of secondary cells (12) of the battery pack if excessive currents and/or excessive temperatures occur. The battery pack (10) and the blower unit (11) are each at least partially cast in a casting compound.