Battery housing and method of manufacturing the same

Abstract

Disclosed is a housing for lithium based batteries, suitable for large format batteries, and a method of manufacturing such a housing using direct electroplating resin technology. The housing, while maintaining stack pressure and acting as a moisture and electrolyte barrier, is lighter in weight, smaller in volume, and is safer than conventional metal housings. The manufacturing process is well suited for automation and is less expensive than current manufacturing processes.

Description

technical field [0001] A broad aspect of the invention relates to the field of batteries. More specifically, the present invention relates to the fabrication of casings for lithium-based batteries using direct electroplating resin technology, suitable for large cylindrical and prismatic batteries. Background technique [0002] U.S. gasoline production peaked in 1970. Geographers predict that the peak of global oil production is imminent. While supply is dwindling, demand continues to rise. The industrialized countries were the largest consumers of oil, but by 1998 were not the fastest growing markets for many years. For example, the countries of the Organization for Economic Co-operation and Development (OECD) account for two-thirds of the world's daily oil consumption. In contrast, however, oil demand in the OECD grew by about 11% during the period 1991-1997, while demand outside the OECD (excluding the former Soviet Union) rose by 35%. After the Arab oil crisis, the i...

AI Technical Summary

Problems solved by technology

Second, these batteries are bulky

Third, these batteries have limited capacity

And in cold weather the range will be shorter

Fourth, these batteries charge slowly

Fifth, these batteries have short life

Because of this annoying problem, discarded batteries can pose an environmental hazard if not properly recycled

Sixth, these batteries are expensive

When the free acid component reacts with lithium to form lithium fluoride (LiF), etc., and lithium in the battery system is consumed, problems such as deterioration in storage stability or charge / discharge cycle characteristics, failure to reach theoretical battery capacity, occur

[0023] Second, there is some variability about the sealing process that cannot be monitored in real time, making the process difficult to

[0024] Third, folding and sticking the sealing sheet is more complicated, which may affect the electrode parts and damage the seal

Because the package has large void areas, negative pressure within the package causes some of the electrolytic solution to migrate into these void areas, creating multiple discontinuous electrical paths that affect cell performance

Because heat is applied to the package to seal it when the vacuum is applied, there is a great risk of draining the electrolyte in the cell

[0026] Fifth, the contact pad must pass through the seal, making the metal-plastic interface difficult to seal and monitor

[0027] Sixth, since height affects the pressure exerted on the electrode interface region, resulting in a pressure differential that may affect battery performance

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