Rechargeable battery having a current collecting plate

Abstract

Disclosed is a rechargeable battery including an electrode assembly having a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The electrode assembly has rounded ends and a flat portion between the rounded ends, a case containing the electrode assembly, a cap plate coupled to the case, and a terminal electrically connected to the electrode assembly and exposed to an exterior of the electrode assembly. The battery also includes a current collecting plate electrically connecting one of the positive electrode and the negative electrode to a terminal, and welded to an end of the positive electrode or the negative electrode at the curved portion of the electrode assembly.

Description

technical field [0001] The technical content relates to a rechargeable battery. In particular, it relates to a rechargeable battery having a current collecting plate. Background technique [0002] Unlike primary batteries, which cannot be recharged, rechargeable batteries can be charged and discharged. Low-capacity rechargeable batteries have been used in small portable electronic devices such as mobile phones, laptop computers and camcorders. High-capacity batteries have been widely used as power sources for driving motors such as those of hybrid cars. [0003] Currently, a high-power rechargeable battery using a non-aqueous electrolyte with high energy density has been developed. The high-power rechargeable battery is a large-capacity rechargeable battery including a plurality of rechargeable batteries connected in series. The high-power rechargeable battery can be used in equipment requiring high power to drive a motor such as a motor of an electric vehicle or the lik...

AI Technical Summary

Problems solved by technology

However, when the lead tab is thinner, its resistance increases, thereby causing heat generation and lower output performance

[0008] In addition, when a rechargeable battery is subjected to an impact, a decrease in contact performance occurs between the lead tab and the electrode assembly, which causes internal heat generation and output reduction

[0009] Also, when the lead tab is soldered to the side end of the uncoated area, the lead tab may not be stably soldered to the uncoated area because the uncoated area is too thin.

In particular, uncoated areas of Li-ion cells are often thin and fragile, making it difficult to adhere and solder lead tabs and uncoated areas

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