Battery External Terminal Current Breaking Mechanism
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Solution Overview
Problem
Conventional sealed batteries, such as lithium ion secondary batteries, face issues with internal pressure increases due to gas storage, which require a space for a deformable diaphragm to break, resulting in dead space and reduced shock and vibration resistance.
Innovation Solution
A battery design with an external terminal and sealing cap configuration that allows internal pressure to break a current path without needing space inside the battery, utilizing a through hole and sealing cap to isolate the current path, providing high shock and vibration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diaphragm is attached to the electrode terminal inside the battery to break the current path when internal pressure rises, then the battery can safely interrupt the current path, but a dead space is created in the battery
Solution Approach 1:
The invention extracts the diaphragm from the internal battery space and relocates it to the external terminal. The external terminal includes a breakable portion that serves as the diaphragm, positioned outside the battery case. When internal pressure rises, this external diaphragm breaks to interrupt the current path, eliminating the need for internal space while maintaining safety functionality.
Solution Approach 2:
The invention introduces a current collecting member as an intermediary element that connects the power generating element inside the battery to the external terminal. This member passes through the battery case via a through hole, allowing the current path to extend externally where the breakable portion is located, thus mediating between the internal pressure source and the external breaking mechanism.
2Reliability
If a diaphragm is attached inside the battery to break when internal pressure rises, then the current path can be cut off, but the battery's shock and vibration resistance is reduced
Solution Approach 1:
The breakable diaphragm function is extracted from the internal battery structure and relocated to the external terminal. By positioning the breakable portion outside the battery case, the internal battery structure remains intact and robust, maintaining high shock and vibration resistance while still enabling current path interruption when needed.
Solution Approach 2:
The invention segments the battery system into internal and external functional zones. The current collecting member is divided into portions inside and outside the battery case, with the breakable portion specifically located in the external terminal. This segmentation allows the internal battery to maintain structural integrity for shock resistance while the external portion handles the pressure-responsive breaking function.
3Reliability
If space is provided inside the battery for the diaphragm to deform, then the diaphragm can function to break the current path, but dead space is created in the battery
Solution Approach 1:
The diaphragm deformation space is extracted from the internal battery volume and relocated to the external terminal area. The external terminal is designed to accommodate the deformation of its breakable portion outside the battery case, eliminating the need for internal deformation space while preserving the diaphragm's pressure-responsive functionality.
Solution Approach 2:
The invention moves the diaphragm functionality from the internal three-dimensional space to the external terminal structure. By utilizing the external space surrounding the battery case, the system achieves diaphragm deformation capability without consuming internal battery volume, effectively adding a spatial dimension outside the original battery boundaries.
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
The solution eliminates dead space within the battery while ensuring reliable current path interruption during internal pressure rises, enhancing both shock and vibration resistance and maintaining airtightness.
Implementation Method 1
when the internal pressure of the battery case rises, the pressure acts on the inside of the sealing cap (on the external terminal side). This pressure causes the sealing cap to move, thereby breaking the breakable portion
Data Source
AI summary
A battery includes a current breaking mechanism 20 provided in a battery and configured such that an external terminal 21 connecting a terminal rivet 31 connected to a power generating element 16 to an electrode terminal is provided with thick portions 48 and 49 and a breakable portion 45 so that the thick portions 48 and 49 are continuous through the breakable portion 45 only. The battery further includes: the terminal rivet 31 placed passing through a closing plate 12 forming a part of a battery case 11, a part of the terminal rivet 31 located outside the battery case 11 being placed on the thick portion 48 of the external terminal 21 in close contact relation, the terminal rivet 31 having a through hole 32; and a sealing cap 25 covering an exit of the through hole 32 on the outside of the battery case 11 and being joined to the external terminal 21 over the entire circumference of the through hole 32 or joined to both the external terminal 21 and the terminal rivet 31 across them. When the internal pressure of the battery case 11 rises, at least part of the sealing cap 25 is moved away from the battery case 11, deforming a part of the external terminal 21, thereby breaking the breakable portion 45.