Battery Cell Case Pressure-Activated Short Circuit
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Solution Overview
Problem
Existing hard shell power batteries face safety concerns due to the need for additional mechanical structures to prevent overpressure, which complicates the mechanical structure and reduces reliability while metal plates used for safety compromise mass energy density.
Innovation Solution
A battery cell protecting case with a conductive supporting plate and nonconductive bracket, featuring through slots and sharp protrusions, allows the battery housing to electrically connect with exposed portions under pressure, short-circuiting the battery without additional mechanical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal plates are installed to ensure safety performance under pressure, then the power battery can short circuit when excessively under pressure, but the mass energy density is reduced and the mechanical structure complexity increases
Solution Approach 1:
The patent removes the metal plate structure entirely and replaces it with a battery housing that has a through-hole exposing the conductive supporting plate. This extraction of the complex metal plate mechanism while retaining the short-circuit safety function directly resolves the contradiction between safety performance and mechanical structure complexity
Solution Approach 2:
The battery housing itself serves the dual function of containing the battery cell and providing the pressure-sensitive short-circuit mechanism through its through-hole design. The conductive supporting plate is always exposed through the through-hole, eliminating the need for separate metal plate components and reducing mechanical structure complexity while maintaining safety performance
2Reliability
If metal plates are installed to ensure safety performance under pressure, then the power battery can short circuit when excessively under pressure, but the mass energy density is reduced
Solution Approach 1:
The patent extracts and removes the metal plate components from the system, replacing them with a simplified housing design that exposes the conductive supporting plate through a through-hole. This elimination of additional metal components directly preserves mass energy density while maintaining the pressure-sensitive short-circuit safety function
Solution Approach 2:
The battery housing is designed to perform multiple functions: it contains the battery cell, provides structural support, and creates the pressure-sensitive short-circuit mechanism through its through-hole design. This multi-functionality eliminates the need for separate metal plate components, thereby preserving mass energy density while ensuring safety performance
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
Enhances safety performance by ensuring high-rate short-circuiting under excessive pressure, improving safety without increasing mechanical complexity or reducing energy density.
Implementation Method 1
the exposed portion being capable of electrically connecting with the conductive battery housing via the through slot due to deformation of the conductive battery housing under pressure
Implementation Method 2
the exposed portion being capable of electrically connecting with the conductive battery housing via the through slot
Data Source
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AI summary
A battery cell protecting case for assembling a battery cell having a positive pole and a negative pole in a conductive battery housing being electrically connected to one of the positive pole and the negative pole is provided. The battery cell protecting case includes a conductive supporting plate being electrically connected to the other one of the positive pole and the negative pole of the battery cell and a nonconductive bracket coupled to the conductive supporting plate. The conductive supporting plate is provided with a layer of insulative material and an exposed portion without insulative material formed thereon. The nonconductive bracket defines a through slot corresponding to the exposed portion. The exposed portion can electrically connect with the conductive battery housing via the through slot due to deformation of the conductive battery housing under pressure, so as to short circuit the power battery.