Pouch-type battery cell

Abstract

The present invention provides a pouch-type battery cell comprising: an electrode assembly formed by stacking a plurality of anode plates and cathode plates with a separator interposed therebetween; a pouch including at least one electrode accommodating portion accommodating the electrode assembly therein, and a sealing portion for sealing the electrode assembly in at least a portion of a periphery of the electrode accommodating portion; and an electrode lead electrically connected to the electrode assembly and including an anode lead and a cathode lead exposed to the outside of the pouch through the sealing portion, in which the electrode accommodating portion includes: a main body portion having a width greater than a height; and an extension portion extending from a center portion in a width direction of the main body portion to one side and having a width smaller than that of the main body portion, the electrode lead being located on an outer side in the width direction of the extension portion, and an end portion of the electrode lead having a height smaller than a peripheral height of the pouch.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Korean Patent Application No. 10-2020-0152191 filed with the Korean Intellectual Property Office on November 13, 2020 and Korean Patent Application No. 10-2020-0152192 filed on November 13, 2020 Interest, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a pouch-type battery unit for a secondary battery in which an electrode assembly is provided inside the pouch, and a battery module including the pouch-type battery unit. Background technique [0004] Unlike primary batteries, secondary batteries can be charged and discharged, making them widely used in various fields such as digital cameras, mobile phones, notebook computers, hybrid vehicles, and electric vehicles. Examples of the secondary battery include a nickel-cadmium battery, a nickel metal hydride battery, a nickel-hydrogen battery, and ...

AI Technical Summary

Problems solved by technology

[0018] In consideration of the above-mentioned problems, increasing the width of the electrode lead 15 to reduce the resistance of the battery cell requires increasing the height of the battery cell 10, however, this has a problem contrary to the recent trend of reducing the overall height of the battery module 20 (especially, In the case of battery modules used in vehicles, there are many restrictions on the height of the battery module)

[0019] In addition, in Figure 4 In the case of the battery cell 10' shown, there is a structure in which two electrode leads 15 are exposed in the same direction, so when increasing the width of the electrode leads 15 ( Figure 4 There are limitations in terms of the transverse length)

[0020] As described above, in the pouch type battery modules 10, 10' according to the prior art, the energy density per unit volume is lowered, and there is a limitation in increasing the width of the electrode lead 15, so it is not suitable for quick charging.

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