Multilayer Battery Bottom Guard Plate for Impact Resistance

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Solution Overview

Problem

Integrally die-casting bottom guard plates for batteries are expensive and prone to deformation under impact, posing a risk of damage to the inner battery cell.

Innovation Solution

A multilayer bottom guard plate structure comprising an upper skin, interlayer, and lower skin, where the upper skin is thicker than the lower skin, utilizing continuous fiber-reinforced resin composite layers and a reticulated fiber structure to enhance impact and deformation resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If an integrally die-casting aluminum alloy plate or steel plate is used as the bottom guard plate, then the manufacturing cost is high, but the impact resistance and deformation resistance are poor

Engineering Contradiction:
Improveimpact resistanceVSAvoidmanufacturing cost
Core Design Contradiction:
StrengthVSEase of manufacture

Solution Approach 1:

The patent applies composite materials by combining resin layers with reticulated fiber structures to create a bottom guard plate that achieves high impact resistance and deformation resistance without requiring expensive metal alloys. The composite structure provides strength comparable to or exceeding traditional metal plates while significantly reducing material cost and improving energy absorption characteristics during impact events.

Inventive Principle:
Principle #40Composite materials

Solution Approach 2:

The patent implements local quality by creating a reticulated fiber structure within the resin layers, where the fiber distribution and density are optimized in specific regions to enhance impact resistance where needed most. This localized reinforcement allows the guard plate to achieve high strength properties without uniformly increasing material thickness or cost across the entire structure.

Inventive Principle:
Principle #3Local quality

2Strength

If the thickness of the bottom guard plate is increased to improve deformation resistance, then the strength is improved, but the weight and cost increase

Engineering Contradiction:
Improvedeformation resistanceVSAvoidweight
Core Design Contradiction:
StrengthVSWeight of moving object

Solution Approach 1:

The patent employs thin film technology by using resin layers with embedded reticulated fiber structures that provide high deformation resistance in a thin profile. The fiber-reinforced resin composite achieves the mechanical properties of much thicker metal plates while maintaining a thin overall thickness, thereby reducing weight without sacrificing protective capability.

Inventive Principle:
Principle #30Flexible shells and thin films

Solution Approach 2:

The composite material structure allows for high strength-to-weight ratio by combining lightweight resin with strategically placed fibrous reinforcement. This enables the bottom guard plate to achieve superior deformation resistance compared to solid metal plates of equivalent or greater weight, as the fiber network distributes and absorbs impact energy efficiently throughout the structure.

Inventive Principle:
Principle #40Composite materials

3Strength

If the thickness of the bottom guard plate is increased to improve deformation resistance, then the strength is improved, but the overall thickness and cost increase

Engineering Contradiction:
Improvedeformation resistanceVSAvoidoverall thickness
Core Design Contradiction:
StrengthVSLength of stationary object

Solution Approach 1:

The patent utilizes thin film technology by implementing a reticulated fiber structure within resin layers that provides exceptional deformation resistance in a minimal thickness. The fiber network creates a three-dimensional reinforcement architecture that achieves the mechanical performance of much thicker materials while maintaining a thin overall profile suitable for modern battery pack designs with space constraints.

Inventive Principle:
Principle #30Flexible shells and thin films

Solution Approach 2:

The reticulated fiber structure provides localized reinforcement throughout the resin layers, concentrating strength properties where needed without requiring uniform thickness increases. This allows the bottom guard plate to achieve high deformation resistance in specific impact zones while maintaining overall thinness, avoiding the need to increase thickness across the entire component.

Inventive Principle:
Principle #3Local quality

Data Source

PatentEP4624151A1Bottom guard plate and battery box
Publication Date: 2025.10.01 EVE ENERGY CO LTD
  • EP4624151A1 patent drawingFigure 1~2
  • EP4624151A1 patent drawingFigure 3~4
  • EP4624151A1 patent drawing

AI summary

A bottom guard plate and battery box are provided in the present application. The bottom guard plate includes an upper skin; a lower skin spaced from the upper skin; an interlayer sandwiched between the upper skin and the lower skin. A thickness of the upper skin is greater than a thickness of the lower skin.