Battery Pack Heat Dissipation for Surgical Handpiece
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Solution Overview
Problem
Cordless handheld surgical instruments face overheating issues due to heat generated by MOSFETs and motors, which can damage electronic components and cause operator discomfort, with existing heat dissipation methods being inefficient.
Innovation Solution
A battery pack design with an outer housing acting as a heat sink and thermally isolated internal housing, incorporating thermally conductive elements and thermoelectric coolers to dissipate heat away from sensitive components and into the environment or a charging station, with a microcontroller managing heat transfer for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the motor controller module is placed in close proximity to the electrical contacts for efficient power delivery, then the power transmission efficiency is improved, but the heat generated by MOSFETs and motor can raise temperatures to 120°C or more, causing heat damage to electronic circuitry and operator discomfort
Solution Approach 1:
The battery pack housing is segmented into an outer housing and an inner housing, with the motor controller module positioned between them. The outer housing serves as a heat sink while the inner housing provides structural support and electrical isolation. This segmentation allows the heat-generating components to be thermally coupled to the outer housing for heat dissipation while maintaining functional integrity.
Solution Approach 2:
The battery pack housing acts as an intermediary thermal management system between the heat-generating motor controller module and the environment. The housing's thermally conductive material and external fins serve as a thermal pathway, transferring heat away from sensitive electronic components without requiring direct thermal contact between the controller and external environment.
2Temperature
If the battery pack housing is designed to dissipate heat efficiently, then the temperature control is improved, but the structural integrity and electrical isolation of battery cells may be compromised
Solution Approach 1:
The housing is divided into an outer housing for heat dissipation and an inner housing for battery cell containment and electrical isolation. This segmentation allows each housing layer to perform its specialized function: the outer housing dissipates heat through fins and thermally conductive material, while the inner housing protects battery cells with electrical insulation and structural support.
Solution Approach 2:
The inner housing serves as an intermediary barrier between the heat-dissipating outer housing and the battery cells. This intermediate layer provides electrical isolation and thermal buffering, allowing the outer housing to manage heat from the motor controller without directly exposing the battery cells to thermal fluctuations or electrical hazards.
3Object-affected harmful factors
If the motor controller module is thermally isolated from the handgrip portion, then the operator comfort is improved, but the heat dissipation path from the motor controller becomes less efficient
Solution Approach 1:
The system is segmented into three thermal zones: the motor controller module generating heat, the battery pack housing serving as an intermediate heat transfer medium, and the handgrip portion where operator contact occurs. The housing's external fins extend toward the environment to provide an efficient heat dissipation pathway that bypasses the handgrip, allowing heat to be rejected away from the operator while maintaining functional integration.
Solution Approach 2:
Heat dissipation is extended into the spatial dimension by incorporating external fins on the battery pack housing. These fins increase the surface area for heat rejection in the radial direction, creating a three-dimensional heat dissipation pathway that does not rely on linear conduction through the handgrip assembly, thereby improving both operator comfort and thermal 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
Effectively reduces the risk of overheating, enhances the lifespan of battery cells, and ensures efficient heat dissipation during both operation and charging, improving the overall performance and safety of the surgical handpiece.
Implementation Method 1
The external housing of the battery pack is directly and thermally coupled to the motor controller portion thereby allowing the direct transfer of heat from the motor controller portion to the external housing of the battery pack where the heat is dissipated to the environment
Implementation Method 2
the direct transfer of heat from the motor controller portion to the external housing of the battery pack
Implementation Method 3
The internal housing is essentially thermally isolated from an external housing of the battery pack
Implementation Method 4
incorporating thermally conductive elements and thermoelectric coolers to dissipate heat away from sensitive components
Data Source
AI summary
A battery powered surgical handpiece system including a surgical instrument having a housing containing a motor and a motor controller portion, and a battery pack configured for detachably coupling to the surgical instrument, the battery pack including a thermoelectric cooler. The thermoelectric cooler is directly thermally coupled between the motor controller portion and a thermally conductive element supported by the battery pack, the thermally conductive element being movable between a first position where the thermally conductive element is spaced apart from an internal housing of the battery pack and a second position where the thermally conductive element is thermally coupled to and between an external housing of the battery pack and the internal housing of the battery pack.