Hollow-type secondary battery

Abstract

The present invention relates to a hollow-type secondary battery, and more specifically, to a hollow-type secondary battery which may quickly discharge heat inside the battery to the outside, and which may automatically short-circuit the battery when pressure inside the battery abnormally increases. The hollow-type secondary battery, according to the present invention, comprises: an electrode assembly which comprises a pair of electrode plates and a separator interposed between the pair of electrode plates; an outer container which accommodates the electrode assembly therein; a hollow inner container which is inserted in the center part of the electrode assembly; a first electrode assembly which is assembled on the upper part of the outer container, and which has the upper end of the inner container inserted therein; and a second electrode assembly which is assembled on the lower part of the outer container, and which has the lower end of the inner container inserted in the center thereof.

Description

technical field [0001] The present invention relates to a hollow secondary battery, in particular to a hollow secondary battery capable of quickly discharging heat inside the battery to the outside and capable of automatically short-circuiting when the internal pressure of the battery rises abnormally. Background technique [0002] With the technological development and increasing demand for mobile devices, the demand for secondary batteries as energy sources is also rapidly increasing. Among these secondary batteries, lithium secondary batteries with high energy density and high discharge voltage have been studied the most, and have been commercialized and widely used. [0003] With the diversification of secondary battery application fields and products, in order to provide corresponding output and capacity, the types of batteries are also showing a trend of diversification. For example, with the trend of miniaturization and thinning of products, each of small mobile devi...

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Problems solved by technology

[0005] However, since these current batteries are internally closed, there is a problem that the heat generated inside cannot be quickly released to the external structure.

[0006] Moreover, the current secondary battery has a current cut-off element for separating the welded part from the external terminal or the electrode assembly to cut off the current when the internal pressure of the battery rises due to overcharging or external impact, but the current cut-off element is suitable for electronic applications. In the case of high-power batteries such as switching systems (Electronic Switching System; ESS) and car batteries, strong and large numbers of solder joints are required to maintain the current density of the welded parts, so it is difficult to install and requires a lot of time, so it is difficult to apply to high power Battery

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