Cylindrical Battery Insulating Plate Through Hole for Lead Pressure
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Solution Overview
Problem
In cylindrical batteries, the negative electrode plate deforms due to local pressure from insulating plates caused by the thickness of positive electrode leads, which can lead to breakage and reduced load characteristics.
Innovation Solution
The battery design includes a first insulating plate with a through hole and a second insulating plate with a recessed portion to house the positive electrode lead, preventing local pressure on the electrode body and ensuring reliable electrical connections through a current-collection plate and sealing body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead is used to connect the positive electrode plate to the sealing body, then electrical connection is ensured, but the negative electrode plate deforms due to local pressure from the lead thickness
Solution Approach 1:
An insulating plate is introduced as an intermediary component between the lead and the electrode body. The insulating plate has a through-hole that allows the lead to pass through, distributing the pressure over a larger area rather than concentrating it at a single point. This mediator structure maintains the electrical connection function while eliminating the harmful local pressure that causes negative electrode plate deformation.
Solution Approach 2:
The insulating plate is designed with a through-hole at the specific location where the lead passes through, creating a localized structural feature that addresses the pressure concentration problem. The hole allows the lead to be positioned such that its weight and connection forces are distributed across the insulating plate structure rather than directly on the electrode body, maintaining local structural integrity.
2Object-affected harmful factors
If two insulating plates are disposed between the current-collection plate and the electrode body, then spatter during welding is prevented, but the lead thickness causes local pressure that deforms the negative electrode plate
Solution Approach 1:
The insulating plate serves a dual function as an intermediary: it protects against welding spatter while simultaneously distributing the lead's pressure through its through-hole structure. By positioning the lead to pass through the hole rather than rest directly on the insulating plate surface, the design eliminates the pressure concentration problem while maintaining the protective barrier function.
Solution Approach 2:
The insulating plate features a localized through-hole structure that specifically addresses the pressure distribution issue at the lead connection point, while the rest of the insulating plate maintains its protective function against welding spatter. This localized structural modification allows the same component to fulfill multiple functions without contradiction.
3Strength
If the sealing body is fixed by swaging with the insulating plate pressing the electrode body, then the electrode body is reliably fixed, but the lead thickness causes local pressure that deforms the negative electrode plate
Solution Approach 1:
The insulating plate acts as a mediator between the sealing body fixation mechanism and the electrode body. During swaging, the insulating plate distributes the compressive forces over a larger area, preventing concentration of pressure at the lead location. This maintains reliable fixation of the electrode body while preventing deformation of the negative electrode plate.
Solution Approach 2:
The through-hole structure of the insulating plate creates a localized pressure distribution pattern during swaging, where the hole allows the lead to be positioned such that fixation forces are distributed across the insulating plate rather than concentrated on the electrode body at the lead connection point.
Data Source
AI summary
A cylindrical battery with an electrode body in which a negative electrode plate and a positive electrode plate connected to a plurality of positive electrode leads are rolled with a separator interposed therebetween, a first insulating plate disposed on the electrode body, a current-collection plate disposed on the first insulating plate, a second insulating plate disposed in contact with an opposite surface of the current-collection plate that opposes the first insulating plate, a sealing body, and an outer jacket can, wherein the first insulating plate has at least one through hole, the first positive electrode lead passes through the through hole and between the first insulating plate and the second insulating plate, is bent from the outer-circumference portion of the current-collection plate onto the current-collection plate and the second insulating plate is provided with a recessed portion to house the first positive electrode lead.