Battery Cell Bracket Snap-Fit for Unobstructed Pressure Relief
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Solution Overview
Problem
The unreasonable design of the bracket in lithium-ion batteries can adversely affect the safety performance by obstructing the pressure relief mechanism, leading to potential explosions due to excessive internal pressure or temperature.
Innovation Solution
The implementation of a snap-fit mechanism between the first and second position-limiting portions on the battery cell and bracket, allowing the end cover to relieve pressure without overcoming the bracket's limitation, thereby ensuring timely pressure relief and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bracket is designed to limit the position of the battery cell in the axial direction, then the position stability of the battery cell is improved, but the pressure relief function of the end cover is obstructed
Solution Approach 1:
The bracket is segmented into a body part and a separate second position-limiting portion. The second position-limiting portion is designed to be detachably connected to the body part, allowing it to be removed or adjusted when pressure relief is needed. This segmentation enables the bracket to provide position stability during normal operation while allowing the pressure relief function to operate when necessary.
Solution Approach 2:
The second position-limiting portion is designed with dynamic characteristics, being able to move relative to the body part or be detached when internal pressure exceeds a threshold. This dynamic design allows the bracket to transition from a state of providing position limitation to a state that permits pressure relief, resolving the contradiction between position stability and pressure relief function.
2Stability of the object's composition
If the bracket provides strong position limitation, then the battery cell position is stabilized, but the end cover cannot actuate to relieve pressure
Solution Approach 1:
The bracket is designed with a preliminary release mechanism where the second position-limiting portion is positioned to provide strong position limitation under normal conditions, but is pre-configured to release automatically when pressure reaches a critical level. This preliminary action ensures that the position stability is maintained during normal operation while the pressure relief function is activated only when necessary, preventing excessive internal pressure buildup.
3Ease of manufacture
If the bracket structure is simplified for easy manufacture, then the manufacturing cost is reduced, but the position limitation and pressure relief functions cannot be simultaneously achieved
Solution Approach 1:
The bracket is divided into a simple body part and a separate second position-limiting portion, where the body part can be manufactured using simple processes while the second position-limiting portion is a separate component that can be added during assembly. This segmentation allows the main body to be manufactured easily while the additional component provides the necessary position limitation and pressure relief functions, achieving both ease of manufacture and 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
This design ensures timely pressure relief, reducing the risk of explosions and enhancing the safety performance of the battery by allowing the end cover to actuate without interference from the bracket, thus stabilizing the battery's position and facilitating efficient temperature regulation.
Implementation Method 1
a second position-limiting portion provided on the bracket and configured to be snap fitted with the first position-limiting portion to limit a position of the battery cell at least in an axial direction of the battery cell
Implementation Method 2
the end cover can be actuated to relieve the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold
Data Source
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AI summary
The present application provides a battery, an electrical device, and a method and device for manufacturing a battery, and relates to the technical field of batteries. The battery comprises a battery cell and a bracket. The battery cell comprises a case and an end cover that are hermetically connected, with a first position-limiting portion being disposed on a side wall of the case. The bracket is provided with a second position-limiting portion that is configured to be snap fitted with the first position-limiting portion to limit a position of the battery cell at least in an axial direction of the battery cell. The first position-limiting portion on the side wall of the battery cell and the second position-limiting portion on the bracket are snap fitted, so that not only the axial position limitation of the battery cell can be realized, but also the second position-limiting portion can give place to the end cover, so that the end cover can be actuated to relieve the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold, and the bracket is prevented from affecting the pressure relief of the battery cell, thereby relieving the pressure of the battery cell in time, reducing the risk of explosion caused by excessive internal pressure of the battery cell and the like, and improving the safety performance of the battery.