Battery Pole Weak Section With Thermal Expansion Break Protection
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Solution Overview
Problem
Existing battery safeguarding structures lack effective protection against both overload currents and high-temperature conditions, leading to safety risks such as molten globule drop and thermal runaway.
Innovation Solution
A pole with a weak section and expansion material that fuses under overload current and breaks under high temperature, providing dual protection by allowing controlled failure at the weak section, thus preventing damage to the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse safeguarding structure is arranged in the connecting piece, then overload current protection is provided, but high-temperature molten globule may drop to the pole group reducing safety
Solution Approach 1:
The invention extracts the safeguarding function from the connecting piece and relocates it to the pole body. By setting a weak section in the pole body with lower cross-sectional area, the breaking point is separated from the connecting piece, preventing molten globule formation at the connecting piece while maintaining overload protection functionality.
Solution Approach 2:
The weak section acts as an intermediary element between the connecting piece and the pole group. It serves as a dedicated sacrificial zone that absorbs the breaking process, preventing direct contact between molten material and the pole group while still providing electrical connection during normal operation.
2Reliability
If traditional safeguarding structures are used, then overload protection is achieved, but high-temperature protection function is not provided
Solution Approach 1:
The weak section design provides multiple protection functions within a single structure. It simultaneously offers overload current protection through electrical fusing and high-temperature protection through thermal expansion of the expansion material, making the pole body a multi-functional safety component.
Solution Approach 2:
The invention utilizes parameter changes of the expansion material in response to temperature variations. When temperature exceeds a predetermined threshold, the expansion material undergoes significant volume expansion, which mechanically breaks the weak section to disconnect the circuit, providing automatic high-temperature protection.
3Reliability
If the pole body cross-sectional area is reduced at the weak section, then controlled breaking is enabled, but electrical resistance increases
Solution Approach 1:
The pole body is designed with non-uniform cross-sectional area, creating a localized weak section with smaller area. This local quality change enables controlled breaking at the weak section while maintaining adequate current carrying capacity in the rest of the pole body, concentrating the resistance increase to a small region.
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
Ensures the safety of batteries by effectively preventing damage from both overload currents and overheating through controlled electrical fusing and thermal expansion, reducing the risk of molten globule drop and thermal runaway.
Implementation Method 1
an expansion material arranged in the weak section, and configured to expand when an ambient temperature or a temperature of the pole body is higher than a set temperature
Implementation Method 2
a cross-sectional area of the pole body having a lower limit value at the weak section to allow the pole body to be electrically fused at the weak section when an overload current flows through the pole body
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A pole (100) includes a pole body (1) and an expansion material (2). The pole body (1) includes a weak section (11), a cross-sectional area of the pole body (1) has a lower limit value at the weak section (11) to allow the pole body (1) to be electrically fused at the weak section (11) when an overload current flows through the pole body (1). The expansion material (2) is arranged in the weak section (11), and configured to expand when an ambient temperature or a temperature of the pole body (1) is higher than a set temperature, to allow the pole body (1) to be broken at the weak section (11) and to realize a breakage protection.