EnerSys has filed a patent for a fire safety arrangement for metal ion batteries, specifically lithium ion batteries. The arrangement includes a fabric band that covers the safety valve or vent of the battery housing, allowing gas to pass through but containing sparks generated by the battery cell. This innovation aims to enhance fire safety in battery technology. GlobalData’s report on EnerSys gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on EnerSys, corrosion resistant battery packaging was a key innovation area identified from patents. EnerSys's grant share as of September 2023 was 50%. Grant share is based on the ratio of number of grants to total number of patents.

Fire safety arrangement for a metal ion battery

Source: United States Patent and Trademark Office (USPTO). Credit: EnerSys

A recently filed patent (Publication Number: US20230231265A1) describes a metal ion battery cell with unique safety features. The battery cell includes multiple electrodes and an electrolyte enclosed within a housing. The housing is equipped with a safety valve or vent that allows gas build-up to escape outside the housing. Additionally, the housing is surrounded by a fabric band that covers the safety valve or vent. This fabric band allows gas to pass through while containing any sparks that may occur.

The patent claims various configurations for the metal ion battery cell, including those with a lithium ion battery cell. The battery cell can be prismatic, cylindrical, or pouch-shaped. The fabric band can surround the housing multiple times and may be elastic. It is also made of a heat-resistant material and can comprise a felt material needled to or between woven fabrics. Furthermore, the safety valve or vent can be covered by a felt filter.

The patent also describes a method of manufacturing the metal ion battery cell. The method involves applying the fabric band to the battery cell in a way that covers the safety valve. This ensures that the safety features are incorporated during the manufacturing process.

In addition to the individual battery cell, the patent also mentions a power module and a battery pack. The power module consists of multiple metal ion battery cells enclosed within a housing. Similar to the individual battery cell, the housing of the power module includes a safety valve or vent covered by a fabric band. This fabric band allows gas to pass through while containing sparks. The battery pack comprises one or more power modules, each with multiple metal ion battery cells. The housing of the battery pack also includes a safety valve or vent covered by a fabric band.

Overall, this patent introduces a metal ion battery cell with enhanced safety features. The inclusion of a fabric band covering the safety valve or vent allows for the safe release of gas while preventing sparks from escaping. This innovation has potential applications in various battery cell configurations, power modules, and battery packs.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.