Secondary Battery External Current Interrupt Detection
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Solution Overview
Problem
It is impossible to confirm the operation of a current interrupt device in a secondary battery from outside, making it difficult to determine whether current interruption is due to voltage decrease, device operation, or battery failure such as a short circuit.
Innovation Solution
A secondary battery design that includes a conductive member, a current interrupt device with a reverse plate connected to the conductive member, and a pressure-sensitive member that changes state with increased pressure, allowing visual confirmation of the current interrupt device's operation from outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current interrupt device is installed inside the secondary battery, then current interruption function is improved, but the ability to confirm device operation from outside deteriorates
Solution Approach 1:
A pressure-sensitive member is introduced as an intermediary indicator between the current interrupt device and the external environment. When the current interrupt device operates and reverses the reverse plate, it increases pressure in the enclosed space, which causes the pressure-sensitive member to change state (open or deform). This state change can be visually confirmed from outside the battery, allowing external detection of the device's operation without compromising the current interruption function.
2Strength
If the battery case is made pressure-resistant, then structural strength is improved, but the pressure-sensitive member may fail to respond accurately to enclosed space pressure changes
Solution Approach 1:
The pressure transmission path is segmented by introducing an enclosed space separated from the battery case interior by the reverse plate. When the reverse plate reverses, it traps and pressurizes the gas in the enclosed space, creating a localized pressure increase that is transmitted to the pressure-sensitive member. This segmentation ensures that only the pressure from the reverse plate operation affects the pressure-sensitive member, not the overall battery case pressure, maintaining response accuracy even in pressure-resistant cases.
3Stress or pressure
If the reverse plate inner diameter is enlarged, then the enclosed space pressure increase is improved, but the device complexity increases
Solution Approach 1:
The inner diameter of the reverse plate is optimized as a critical parameter to achieve sufficient pressure increase in the enclosed space when the reverse plate reverses. By carefully selecting this dimensional parameter, the design ensures that the pressure-sensitive member reliably responds to the pressure change without requiring additional complex structural elements. This parameter optimization balances pressure generation capability with structural simplicity.
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
Enables external confirmation of the current interrupt device's operation by visually recognizing the state change of the pressure-sensitive member, preventing false identification of pressure increases and ensuring accurate determination of device functionality.
Implementation Method 1
a pressure-sensitive member that seals the opening and changes in state in response to an increase in pressure in the space surrounded by the reverse plate and the conductive member
Data Source
AI summary
A secondary battery has a conductive member, a current interrupt device, and a pressure-sensitive member. The conductive member has an opening on an outer side of the secondary battery. The current interrupt device has a reverse plate connected with the conductive member and is provided inside the secondary battery. The pressure-sensitive member seals the opening, and a state of the pressure-sensitive member changes in accordance with an increase in pressure of a space surrounded by the reverse plate and the conductive member.