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Предотвращение утечки водорода в щелочной батарейке

Номер профиля: ТЗ-52
Аннотация запроса
Многонациональная компания, расположенная на северо-востоке Англии, ищет новые подходы предотвращения утечки водорода в щелочных батареях первичных источников тока. Возможные решения могут быть следующими: мембраны, удаление избыточного газа, улучшенная изоляция или другие решения, подходящие для производства батарей в большом объеме. Требуется сотрудничество с партнерами, у которых уже есть знания и материалы, ведущие к техничесому сотрудничеству или коммерческому лицензионному соглашению. Исходный текст: "A multinational in North East England are looking for new approaches to preventing hydrogen leakage in primary alkaline batteries. Possible solutions could be: membranes; removal of excess gas; improved sealing or other solutions suitable for high volume battery production. Collabration sought from partners with existing knowledge and materials leading to technical co-operation or commercial license agreement."
Описание запроса
The company are looking for solutions to eliminate leakage as a source of consumer complaints for primary alkaline batteries. Leakage is the number one consumer complaint for primary batteries. As new product designs have steadily increased the performance and service life of alkaline cells, the stresses put upon the sealing mechanisms have also increased. Fortunately leakage is still a relatively rare event, occuring at a frequency of a few parts per million. It is most commonly encountered during conditions of over-discharge. One of the leading drivers is the build up of gases produced in side processes, chief of which is the reaction of zinc with the water in the alkaline electrolyte to generate hydrogen.

Hydrogen gassing is therefore inherent to alkaline battery chemistry. Under most conditions its rate is slow enough that it does not become an issue and is unnoticeable to the user. However there are circumstances under which gassing becomes problematic, increasing the chances for leakage.

Most of the design variables that drive leakage have been identified, but approaches to resolve the problem usually carry significant trade-offs. For example increasing the void volume allows more room in which to accumulate gas, but this sacrifices space available for actives. An ideal solution wold not compromise performance.

Much attention has been focused on the seals of the cell, and battery manufacturers have made tremendous progress in engineering seals to resist leakage. Many designers utilise injection-moulded nylon or polypropylene (PP) for this purpose. Both materials are compatible with the concentrated alkaline electrolyte. PP is inexpensive, easily molded and hydrophobic. But it is a commodity material with widely varied physical properties. Nylon is a moldable engineering material with better quality characteristics and higher strength, however it is more expensive, hydrophilic and subject to environmental stress corrosion. Although PP has a higher gas permeability than nylon, the permeation rate is too low to relieve pressure buildup that can occur under abusive conditions. This has led some designers to consider using a membrane to vent the gas. Such a membrane could be implemented as a single stand-alone component, similar to the current nylon seal, or as a piece attached to another component.

Other approaches for improved leak resistance might focus on the interface between the sealing gasket and the other parts of the battery such as the can walls and the current collecting nail. These offer pathways for the electrolyte to escape. Alternatively it may be possible to use chemical means to prevent the gas from forming in the first palce or to recombine it with other materials in the cell.
Технические спецификации/Особые технические требования запроса
Interested parties should seek to deliver solutions to mitigate the leakage of primary alkaline batteries. Possible solutions include, but are not limited to:

removing the evolved gas from the cell, for example, using membrane technology. Preferred approaches would:

a) respond to changes in pressure, ie. operate or become permeable as internal pressure increases OR
b) vent the gas and re-seal OR
c) selectively permeate hydrogen

- recombing the gases within the cell
- improvidng the seals of the cell via new/modified materials/additives
- reducing or eliminating the generation of hydrogen gas.
Технологические ключевые слова
Химическая технология и техника
Специальные и промежуточные химикаты
Сжижение и газификация топлива
Техника и технология охраны окружающей среды
Краткие коды рыночных применений
  • Энергетика
Рыночные применения
Данные отсутствуют
Тип требующегося сотрудничества
  • Техническая кооперация
  • Дальнейшие исследования
  • Лицензионное соглашение
Предпочитаемые страны
Данные отсутствуют
Тип искомого партнера
Данные отсутствуют
Область деятельности партнера
Данные отсутствуют
Задачи, стоящие перед партнером
Данные отсутствуют
Дополнительная информация
Данные отсутствуют
  • Промышленность
Размер организации / фирмы
  • 250-500 сотрудников
Дата публикации: 2009-03-06 | Вернуться

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