Battery Pack Fuse Temperature Control for Discharge Inhibition
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Solution Overview
Problem
In battery packs for electric work machines, fuses can unintentionally melt due to high ambient temperatures or prolonged continuous use, leading to potential damage and safety issues.
Innovation Solution
A battery pack design that includes a battery, an attachment port, a current path, at least one fuse, a temperature detector, and a control circuit. The control circuit monitors the fuse temperature and outputs a command to reduce or stop the discharge current when the temperature reaches a certain threshold, preventing the fuse from melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuse is used to protect the battery pack from excessive discharge current, then the reliability is improved, but the fuse may melt unintentionally when temperature increases due to external heating or prolonged use
Solution Approach 1:
The control circuit proactively monitors fuse temperature and reduces or stops discharge current before the fuse reaches its melting point. This preliminary action prevents the harmful effect of unintentional melting while maintaining the protective function of the fuse.
Solution Approach 2:
The temperature detector continuously monitors fuse temperature and provides feedback to the control circuit. The control circuit adjusts discharge current based on this feedback, creating a closed-loop control system that prevents fuse melting while maintaining reliable protection.
2Productivity
If the discharge current is continuously supplied to maintain productivity, then the productivity is improved, but the fuse temperature increases leading to potential melting
Solution Approach 1:
The discharge current is dynamically adjusted based on real-time fuse temperature measurements. The control circuit increases current when temperature is low to maintain productivity, and reduces or stops current when temperature approaches critical levels, enabling continuous safe operation.
Solution Approach 2:
The control circuit changes the discharge current parameter based on temperature conditions. By adjusting current magnitude or interruption timing according to fuse temperature, the system maintains productivity while preventing thermal damage.
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 solution effectively inhibits the fuse from melting unintentionally, ensuring the battery pack's safety and reliability by reducing or stopping the discharge current when the fuse temperature reaches a critical level.
Implementation Method 1
a temperature detector configured to output a temperature signal indicating a fuse temperature
Implementation Method 2
The at least one fuse melts itself to thereby interrupt the current path
Implementation Method 3
a battery configured to include a positive electrode and a negative electrode
Data Source
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AI summary
The battery pack (10) for an electric work machine in one aspect of the present disclosure includes a battery (5), an attachment port (4), a current path (27; 28), at least one fuse (41a; 41b; 42a; 42b), a temperature detector (44), and a control circuit (31). The battery includes a positive electrode and a negative electrode. The attachment port is detachably attached to the electric work machine. The current path is coupled to the positive electrode or the negative electrode. The current path delivers a discharge current from the battery to the electric work machine. The at least one fuse is on the current path. The temperature detector outputs a temperature signal indicating a fuse temperature. The control circuit reduces or stops the discharge current based on the fuse temperature having satisfied or satisfying a discharge inhibition requirement.