Battery Module Fixing Strap With Elastic Expansion Restraint
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Solution Overview
Problem
Battery modules in new energy vehicles experience expansion and deformation during charging and discharging, leading to potential damage from shear forces caused by fixing straps, which can result in failure.
Innovation Solution
A battery module design incorporating a strap-shaped body and an elastic fixing part, such as a spring, that surrounds the batteries and end plates, providing a gap for elastic displacement and restraint to suppress deformation and prevent damage from shear forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixing strap is used to fix the end plate and the plurality of batteries, then the batteries are restrained and reliability is improved, but if the expansion is too great, an interfering restraint is caused that produces shear force and may damage the batteries
Solution Approach 1:
The fixing strap's mechanical properties are changed by incorporating an elastic component (spring or elastic sheet) that can change its stiffness and force characteristics based on the degree of battery expansion, allowing it to provide restraint during normal operation but yield when expansion exceeds safe limits
Solution Approach 2:
The elastic fixing part acts as a pre-designed cushioning element that absorbs excess expansion forces before they can be transmitted as damaging shear forces to the batteries, protecting the system in advance against over-expansion damage
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 design effectively limits battery module displacement and deformation, enhancing reliability by allowing for elastic expansion while preventing damage from shear forces, thus improving battery performance.
Implementation Method 1
a fixing strap including a strap-shaped body and an elastic fixing part. The strap-shaped body surrounds the plurality of batteries and the two end plates and defines a gap, and the elastic fixing part is disposed in the gap and connected to the strap-shaped body
Data Source
AI summary
The present disclosure provides a battery module. The battery module includes a plurality of batteries that are stacked and two end plates disposed at two ends of the plurality of batteries in a stacking direction of the batteries. The battery module further includes a fixing strap, which includes a strap-shaped body and an elastic fixing part. The strap-shaped body surrounds the plurality of batteries and the end plates and defines a gap. The elastic fixing part is disposed in the gap and connected to the strap-shaped body. The elastic fixing part, together with the strap-shaped body, can provide an expansion space for the battery module with a certain restraint. In this way, the deformation of the battery module can be suppressed, and the battery module is protected from being damaged by a shear force of the strap-shaped body, thereby improving reliability of the battery performance.