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Lithium secondary battery

A lithium secondary battery, unit cell technology, applied in the direction of secondary batteries, lithium storage batteries, battery pack components, etc., can solve problems such as poor electrical connection

Active Publication Date: 2010-11-10
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention has been made to solve the aforementioned problems, and an object of the present invention is to provide a lithium secondary battery in which the size of the entire lithium secondary battery can be reduced even when a bare cell and an outer cover of the bare cell are combined with each other, Poor electrical connection can be prevented and adhesive can be applied as little as possible in pouch-type lithium secondary batteries as long as it is sufficient to ensure a safe joint between pouch and cover

Method used

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  • Lithium secondary battery
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Embodiment Construction

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Abstract

A lithium secondary battery includes: a bare cell having an electrode assembly and a case for containing the electrode assembly; a protection circuit module connected to the bare cell; and a cover enclosing the protection circuit module and the bare cell and having an external terminal electrically connected to electrodes of the electrode assembly, wherein a part of the cover is a molded portion made of resin using a mold.

Description

lithium secondary battery technical field 本发明涉及一种锂二次电池,更具体而言,涉及一种锂二次电池的外部结构。 Background technique 二次(可再充电)电池根据其中所使用的电极(插层基质)划分为镍镉(Ni-Cd)电池、镍氢(Ni-MH)电池、锂电池、锂离子电池。 具体而言,由于锂二次电池具有3.6V的驱动电压和高的单位重量能量密度,所以锂二次电池在本领域中得到了广泛应用,所述3.6V的驱动电压大约是Ni-Cd电池或Ni-MH电池驱动电压的三倍。 在锂二次电池中,锂基氧化物用作正极活性材料,碳基材料用作负极活性材料。此外,根据其中所使用的电解质,锂二次电池可以划分为液态电解质电池和聚合物电解质电池。液态电解质电池常常被称为锂离子电池,而聚合物电解质电池常常被称为锂聚合物电池。另外,锂离子电池可以多种形状制造,比如卷型、多边形型和袋(pouch)型。 通常,锂二次电池包括:电极组件,该电极组件具有其上涂覆有正极活性材料的正电极板、其上涂覆有负极活性材料的负电极板、夹置在每个正电极板和每个负电极板之间并用于防止短路和仅允许锂离子通过的隔板;用于容纳电极组件的锂二次电池容器(case);以及,注入到该电池容器中用于使锂离子迁移的电解质。 而且,根据其中所使用的电极,锂二次电池可以划分为使用液态电解质的锂金属电池和锂离子电池,以及使用聚合物固态电解质的锂聚合物电池。 在长方型或柱型锂二次电池中,铝或金属罐体可以用作用于容纳电极组件和电解质的容器。在袋型锂二次电池中,袋用作用于容纳它们的容器。 通常,袋具有由金属箔层和覆盖它的合成树脂层所组成的多层结构。在这种情况下,与金属罐体相比,电池的重量可以显著减少。在多层袋中,铝用作用于箔的材料。包括在袋多层膜的内层中的聚合物膜保护金属箔免受电解质的影响,并且防止正电极和负电极以及电极端子之间的短路。 为了提供袋型锂二次电池,首先将通过层叠正电极、隔板和负电极或者层叠并缠绕它们而形成的电极组件插入袋的开口中。然后,将袋的开口的边缘加热并同前、后袋膜(pouchfilm)熔融以密封容纳有裸单元电池(barecell)的袋的开口。 随后,将比如保护电路模块或正温度系数(PTC)元件的附件或辅助结构附着到裸单元电池上,由此提供核心...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M2/02H01M10/058H01M10/052
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50H01M10/052H01M50/202H01M50/105H01M50/178H01M50/557H01M50/574H01M50/218H01M2220/30H01M2200/00
Inventor 徐镜源
Owner SAMSUNG SDI CO LTD