Bonded Current Collector Layout in Wound Cells for Impact Resistance

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Solution Overview

Problem

Batteries are prone to short circuits when subjected to external forces due to damage to current collectors, leading to safety concerns such as burrs or sharp corners.

Innovation Solution

A wound cell design where the first and second current collector areas are bonded together by a bonding member, allowing external forces to be transmitted and causing both electrode plates to break simultaneously, reducing the likelihood of short circuits and enhancing safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the current collector is bonded to the packaging shell to fix the electrode plate, then the electrode plate is fixed in position, but when external force is applied, the current collector may be torn or wrinkled causing short circuit

Engineering Contradiction:

Improvefixed position of electrode plateVSAvoidrisk of short circuit

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The current collector is divided into two functional areas: a first current collector area bonded to the packaging shell for positioning, and a second current collector area left unbonded to maintain flexibility and prevent damage under external force, thereby eliminating short circuit risk

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the current collector are given different properties: the first current collector area has bonding capability for structural stability, while the second current collector area maintains original flexibility to avoid tearing or wrinkling under impact

Inventive Principle:

Principle #3Local quality

2Strength

If the current collector is bonded rigidly to ensure structural strength, then structural strength is improved, but the current collector cannot deform under external force leading to burrs or sharp corners

Engineering Contradiction:

Improvestructural strengthVSAvoidburs or sharp corners

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The current collector is segmented into a bonded first current collector area for structural strength and an unbonded second current collector area that can deform elastically under external force to prevent burr formation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The unbonded second current collector area acts as a cushioning zone that absorbs external impact energy through elastic deformation before it reaches the bonded regions, preventing the formation of burrs or sharp corners

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11749828B2Wound cell and battery using the same

Publication Date: 2023.09.05 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

An impact resistant wound cell comprises a first electrode plate with a first surface and a second surface. The first surface comprises a first active material area and a first current collector area, the second surface comprises a second active material area and a second current collector area. The first current collector area is located on an inner side of an outermost circle of the wound cell. In the first electrode plate, the second current collector area and the first current collector area are adjacent to and opposite to each other, the first current collector area and the second current collector area are bonded together by a first bonding member. The present disclosure further provides a battery using the wound cell.