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Improved separators for VRLA batteries and methods relating thereto

A technology for separators and batteries, applied in secondary batteries, lead-acid batteries, battery components, etc., can solve problems such as glass fiber breakage, poor battery performance, and dendrite growth

Active Publication Date: 2018-03-23
DARAMIC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glass fibers in AGM separators can break over time during cycling and high compression
Degradation of glass fibers may alter the level of compression in the battery system over time and may affect acid transport within the AGM separator, possibly leading to poor acid availability of the electrodes and / or potentially causing acid stratification
Acid stratification in VRLA batteries can lead to underutilization of parts of the electrodes, possibly resulting in sulfation, poor battery performance and / or short or reduced cycle life
Also, when acid-filling a VRLA battery with conventional AGM separators, the electrodes may become more reactive, consuming the acid and / or converting it to water or steam, which may produce lead sulfate and may cause hydration short circuits, Dendrite growth, reduced battery life, dry spots and / or thermal runaway
The last area of ​​the AGM separator wetted by the electrolyte is most at risk for hydration shorts

Method used

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  • Improved separators for VRLA batteries and methods relating thereto
  • Improved separators for VRLA batteries and methods relating thereto
  • Improved separators for VRLA batteries and methods relating thereto

Examples

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Embodiment

[0042] In these examples, separators were formed according to various embodiments described herein and tested to determine properties and improvements.

[0043] One control separator ("Control 1") used in the following examples was a single layer AGM separator (specifically, a commercially available AGM separator known as H&V BGO 15565 with a basis weight of 155 g / m 2 ).

[0044] A variety of modified polyethylene separator layers (to be part of a composite separator) were prepared by a method of producing a microporous material comprising the steps of: providing ultra-high molecular weight polyethylene (UHMWPE); providing a processing plasticizer; adding fillers ( For example, silica) is formed into a mixture with UHMWPE, filler / UHMWPE is in the range of about 1:9 to about 15:1 by weight; processing plasticizers are added to the mixture; the mixture is extruded to form a sheet of the mixture; calendering and Forming the sheet to form a flat plate (Samples 4 and 5 below) or a...

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Abstract

Improved battery separators, batteries, and systems, as well as methods relating thereto are disclosed herein for use in various lead acid batteries such as valve-regulated lead acid (VRLA) batteriesthat include one or more AGM layers. The improved battery separators described herein may provide a battery system with an advantage of a significantly decreased acid filling time and a significantlyincreased acid filling speed. Various improved batteries, methods and systems are described herein using such improved battery separators that increase acid filling speed and decrease acid filling time for a VRLA battery.

Description

[0001] References to related applications [0002] This application claims the benefit of and priority to US Provisional Patent Application Serial No. 62 / 157,039, filed May 5, 2015, which is incorporated herein by reference in its entirety. technical field [0003] According to at least selected embodiments, the present disclosure or invention relates to improved battery separators, batteries, and / or methods of manufacture and / or use. According to at least some embodiments, the present disclosure or invention relates to improved separators for VRLA batteries (including AGM, gel, sealed and / or maintenance-free batteries) and / or acid filling using specifically improved battery separators Improved methods for VRLA batteries. Additionally, disclosed herein is a method for enhancing acid filling, improving acid diffusion, increasing acid filling speed, reducing the time required to fill a battery with acid, improving acid delivery (e.g., making acid delivery more uniform across t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M10/12H01M50/434H01M50/437H01M50/454H01M50/463H01M50/489H01M50/491
CPCH01M10/121H01M50/491H01M50/463H01M50/437H01M50/434H01M50/454H01M50/489Y02E60/10H01M50/44H01M50/446Y02P70/50H01M50/417
Inventor 埃里克·H·米勒罗伯特·W·斯菲尔
Owner DARAMIC LLC
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