Battery Bottom Plastic Structure for Pressure-Buffered Molding

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Solution Overview

Problem

Existing plastic components for batteries face challenges with slow injection molding efficiency and potential damage from excessive hydraulic pressure, particularly in larger sizes, and the connection pieces contribute to increased thickness and material requirements.

Innovation Solution

A plastic component design with a buffer recess and connection piece recess, offset to reduce thickness and material use, incorporating flow guide holes and a thinned structure to manage pressure and facilitate efficient molding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a separate bottom cover is used for the housing, then the housing can be assembled with multiple components, but the number of parts increases and assembly complexity increases

Engineering Contradiction:
Improvehousing assemblyVSAvoidnumber of parts
Core Design Contradiction:
Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent integrates the bottom cover and battery into a single integrated component. The battery serves dual functions as both the power source and the bottom cover of the housing, eliminating the need for a separate bottom cover part and reducing overall assembly complexity.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The battery is designed to perform multiple functions: it provides electrical power to the electronic component and simultaneously serves as the bottom cover structure of the housing. This multi-functionality reduces the total number of components needed in the device.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Reliability

If adhesive is used to attach the electronic component to the bottom cover, then the component can be secured, but residual adhesive may remain and contaminate the electronic component

Engineering Contradiction:
Improvecomponent attachmentVSAvoidadhesive contamination
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a foam member as an intermediary element between the electronic component and the integrated bottom cover-battery. The foam member provides the necessary adhesive bonding function while acting as a protective barrier that prevents direct contact between adhesive and the electronic component, thus avoiding contamination.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The foam member is designed to perform multiple functions: it provides structural support, enables adhesive bonding, and protects the electronic component from adhesive contamination. The foam member essentially serves itself to solve multiple problems simultaneously.

Inventive Principle:
Principle #25Self-service

3Use of energy by moving object

If the battery is made larger to increase capacity, then more power is available, but the overall device size increases

Engineering Contradiction:
Improvebattery capacityVSAvoiddevice size
Core Design Contradiction:
Use of energy by moving objectVSVolume of moving object

Solution Approach 1:

The battery is designed to serve dual purposes: it provides electrical power and simultaneously functions as the bottom cover structure of the housing. By eliminating the need for a separate bottom cover, the overall device volume is reduced while maintaining the required battery capacity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the battery and bottom cover into a single integrated component, eliminating redundant structural elements. This merging allows the device to maintain adequate battery capacity while minimizing the overall volume by removing the separate bottom cover that would otherwise be required.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentEP4376178B1Bottom plastic and battery having same
Publication Date: 2026.04.29 HITHIUM TECH HK LTD
  • EP4376178B1 patent drawingFigure 1~4
  • EP4376178B1 patent drawingFigure 5~7
  • EP4376178B1 patent drawingFigure 8~9

AI summary

Provided are a plastic component and a battery having the same. The plastic component includes a body having a first side surface (1) and a second side surface (2) facing away from the first side surface (1). The first side surface (1) has a buffer recess (11) recessed towards the second side surface (2). The buffer recess (11) has at least one flow guide hole (12) penetrating the body in a thickness direction of the body. The second side surface (2) has a connection piece recess (21) recessed towards the first side surface (1), and the connection piece recess (21) has a pole through hole (4) penetrating the body in the thickness direction of the body.