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Secondary battery

A secondary battery and electrode assembly technology, which is applied to secondary batteries, batteries, battery pack components, etc., can solve the problems of CID not operating, hindering the correct operation of CID, and increasing

Active Publication Date: 2020-10-20
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the current and component heat are rapidly generated due to the external short circuit, the internal pressure of the battery will slowly increase, therefore, the CID will not operate correctly
In addition, the seal of the cover assembly can be canceled due to damage to the assembly, preventing proper operation of the CID

Method used

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Embodiment Construction

[0025] Hereinafter, exemplary embodiments of the present invention will be described in detail.

[0026] Various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the example embodiments set forth herein. Rather, these example embodiments of the invention are provided so that this disclosure will be thorough and complete and will convey the inventive concept of the invention to those skilled in the art.

[0027] Also, in the drawings, the size or thickness of various components are exaggerated for conciseness and clarity. Like reference numerals refer to like elements throughout. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms are intended to include the plural unle...

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Abstract

The present invention relates to a secondary battery enabling enhanced safety in case of an external short circuit. According to one example, the secondary battery comprises: an electrode assembly; acase for accommodating the electrode assembly; and a cap assembly coupled to the top of the case. The cap assembly comprises: a cap-up; a safety vent provided below the cap-up; a cap-down provided below the safety vent and having a through hole and a gas discharge hole; an insulator provided between the safety vent and the cap-down; a sub-plate provided below the cap-down; and a solder member forelectrically connecting the safety vent and the sub-plate. The safety vent and the sub-plate are electrically connected by means of soldering.

Description

technical field [0001] The present invention relates to a secondary battery. Background technique [0002] Generally, a cylindrical lithium ion secondary battery usually includes a cylindrical electrode assembly, a cylindrical case bonded to the electrode assembly, an electrolyte injected into the case to allow lithium ions to move, and bonded to one side of the case to prevent leakage of the electrolyte A cap assembly separated from the electrode assembly. In addition, a current interrupt device (CID) capable of interrupting the flow of current when an abnormality occurs in the secondary battery is provided in the cap assembly. [0003] For example, if the secondary battery is overcharged, decomposition of the electrolyte may occur due to discharge gas such as carbon dioxide or carbon monoxide, and thus the internal pressure of the secondary battery may increase. In this case, the CID of the cap assembly may operate to interrupt the flow of current, thereby preventing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M2/12H01H37/76H01M50/574
CPCH01H37/76Y02E60/10H01M50/3425H01M50/152H01M50/578H01M2200/20H01M50/574H01M50/581H01M2200/10H01M10/0525
Inventor 田炳玟
Owner SAMSUNG SDI CO LTD