Battery Box Partition Assembly for Accurate Positioning Under Cell Swelling
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Solution Overview
Problem
The safety and service life of batteries are compromised due to inaccurate positioning of partitions in box assemblies, leading to uneven pressure, extrusion of battery cells, and potential damage to the connection joints, which affects the battery's safety and longevity.
Innovation Solution
A box assembly design featuring an end plate with channels and a partition with inserting portions, where the inserting portions have a bending region and connecting region to ensure accurate positioning and stable assembly, distributing stress and preventing damage from cell swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the partition is connected to the end plate without accurate positioning structures, then the manufacturing complexity is reduced, but the positioning accuracy and assembly stability deteriorate
Solution Approach 1:
The partition structure is segmented into a body portion and multiple inserting portions, where each inserting portion independently engages with corresponding channels on the end plate. This segmentation enables precise positioning through the interaction of multiple discrete elements rather than relying on a single complex positioning feature.
Solution Approach 2:
The inserting portions are nested within the channels formed on the end plate, creating a hierarchical structure where the partition's inserting portions fit inside the end plate's channels. This nesting arrangement provides accurate positioning while maintaining structural simplicity, as the positioning function is embedded within the basic connection structure.
2Reliability
If the partition uses a simple connection structure without bending regions, then the manufacturing process is simplified, but the stress distribution and connection reliability deteriorate
Solution Approach 1:
The inserting portions incorporate bending regions that change the geometric parameters of the connection structure. These bending regions create flexible zones that can deform under stress, distributing mechanical loads more effectively across the connection interface between the partition and end plate, thereby improving connection reliability.
Solution Approach 2:
The bending regions in the inserting portions act as pre-designed stress-absorbing elements that cushion against mechanical shocks and thermal expansion forces before they can damage the rigid connection points. This beforehand cushioning protects the weld joints and improves overall connection reliability under varying operating conditions.
3Productivity
If the partition is positioned inaccurately, then the assembly process is faster, but the battery cell safety and service life deteriorate
Solution Approach 1:
The inserting portions and channels are designed with complementary geometries that enable self-aligning and self-positioning during the assembly process. As the partition is inserted into the end plate, the inserting portions automatically guide themselves into the correct position within the channels, eliminating the need for complex external positioning fixtures or procedures while ensuring accurate placement.
Solution Approach 2:
The design replaces complex mechanical positioning systems (such as external jigs, fixtures, or multi-step alignment procedures) with an integrated structural solution where the partition's inserting portions and the end plate's channels form an inherent positioning mechanism. This substitution maintains assembly speed while dramatically improving positioning accuracy.
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 enhances the safety and service life of batteries by ensuring accurate partition positioning, reducing the risk of cell extrusion and joint damage, and improving the overall stability and durability of the battery.
Implementation Method 1
the bending region stretches and deforms to disperse stress, so as to alleviate deformation and damage due to stress on the joint
Data Source
AI summary
Provided are a box assembly, a battery, an electric device, and a manufacturing method and apparatus of box assembly. The box assembly includes: an end plate, where the end plate is provided with at least two channels; and a partition, where the partition is configured to be connected to the end plate and separate an internal space of the box assembly; and the partition includes a body and at least two inserting portions located on an end portion of the body, each of the inserting portions having an end connected to an end portion of the body, and each of the inserting portions including a connecting region and a bending region, with the connecting region connected to the body through the bending region; where each channel of the at least two channels fits with at least one of the inserting portions by inserting.