KR-102961061-B1 - Secondary Battery

KR102961061B1KR 102961061 B1KR102961061 B1KR 102961061B1KR-102961061-B1

Abstract

The present invention relates to a secondary battery in which the first region and the second region of the insulating sheet are made of different materials, thereby blocking heat conduction between the electrode assembly and the cap plate and also verifying the presence of foreign matter through vision inspection. For example, the present invention discloses a secondary battery comprising an electrode assembly having a first electrode tab and a second electrode tab, a first terminal electrically connected to the first electrode tab of the electrode assembly, an insulating sheet having a first region covering the upper surface of the electrode assembly and a second region covering both long sides of the electrode assembly, a case accommodating the electrode assembly, the first terminal and the insulating sheet, and a cap plate sealing the upper opening of the case, wherein the insulating sheet has the first region composed of three layers and the second region capable of transmitting light.

Inventors

권민형
이현수
용준선

Assignees

삼성에스디아이 주식회사

Dates

Publication Date: 20260508
Application Date: 20211110

Claims (17)

Electrode assembly having a first electrode tab and a second electrode tab; A first terminal electrically connected to the first electrode tab of the electrode assembly; An insulating sheet having a first region covering the upper surface of the electrode assembly and a second region covering both long sides of the electrode assembly; A case accommodating the electrode assembly, the first terminal, and the insulating sheet; and It includes a cap plate that seals the top opening of the above case, and The above insulating sheet is a secondary battery in which the first region is composed of three layers and the second region is capable of transmitting light.
In Article 1, The first region of the above insulating sheet is A first sheet portion integrated with the above second region; A second sheet portion that is in close contact with the outer surface of the first sheet portion and is made of a material different from that of the first sheet portion; and A secondary battery comprising a third sheet portion in close contact with the inner surface of the first sheet portion.
In Article 2, The above first sheet portion and the above second region are a secondary battery made of polypropylene capable of transmitting light.
In Article 2, The above second sheet portion is a secondary battery made of polyimide.
In Article 2, The above third sheet portion is a secondary battery made of white polypropylene.
In Article 1, The above first region is a secondary battery comprising an upper surface portion interposed between the rectangular plate-shaped cap plate and the electrode assembly, and two extension portions bent downward from both ends of the upper surface portion.
In Article 6, The second region extends downward from the lower end of the two extensions and is a secondary battery interposed between the two long sides of the electrode assembly and the case, respectively.
In Article 1, The above second region is a secondary battery having both surfaces with roughness.
In Article 1, The above insulating sheet further comprises a third region having color, extending downward from the lower end of the second region and comprising a secondary battery.
In Article 9, The above third region is a secondary battery with a light transmittance different from the above second region.
In Article 9, The above third region is a secondary battery having a light transmittance of 80% or more and 90% or less.
In Article 1, The above insulating sheet is a secondary battery in which the light transmittance of the second region is 90% or more and 100% or less.
Electrode assembly having a first electrode tab and a second electrode tab; A first terminal electrically connected to the first electrode tab of the electrode assembly; An insulating sheet having a first region covering the upper surface of the electrode assembly and a second region covering both long sides of the electrode assembly; A case accommodating the electrode assembly, the first terminal, and the insulating sheet; and It includes a cap plate that seals the top opening of the above case, and The first region of the above insulating sheet First sheet section; A second sheet portion that is in close contact with the outer surface of the first sheet portion and is made of a material different from that of the first sheet portion; and A secondary battery comprising a third sheet portion that is in close contact with the inner surface of the first sheet portion and is made of a different color from the first sheet portion.
In Article 13, The above second region is A second area, a first sheet portion extending from the first sheet portion of the first area; and A secondary battery that covers the inner surface of the first sheet portion of the second region and includes a second sheet portion of the second region extending from the third sheet portion of the first region.
In Article 14, A secondary battery characterized in that the first sheet portion of the first region and the first sheet portion of the second region are made of light-transmitting polypropylene.
In Article 13, The second sheet portion of the first region above is a secondary battery made of polyimide.
In Article 14, A secondary battery in which the third sheet portion of the first region and the second sheet portion of the second region are white polypropylene.

Description

Secondary Battery Various embodiments of the present invention relate to secondary batteries. Unlike primary batteries, which cannot be recharged, secondary batteries are rechargeable and dischargeable. Low-capacity batteries, consisting of a single cell packaged in a pack, are used in small portable electronic devices such as mobile phones and camcorders, while high-capacity batteries, consisting of dozens of connected packs, are widely used as power sources for motors in hybrid and electric vehicles. A secondary battery can be constructed by housing an electrode assembly formed by interposing a separator between a positive plate and a negative plate, along with an electrolyte, in a case, and installing a cap plate in the case. Here, typical examples of the electrode assembly include a wound type or a stack type. In such an electrode assembly, a non-circulating tab may protrude in an upward or lateral direction, and a current collector may be connected to the non-circulating tab. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the embodiments of the present invention, and therefore may include information that does not constitute prior art. FIG. 1 is a perspective view of a secondary battery according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a secondary battery according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a secondary battery according to an embodiment of the present invention. FIGS. 4a and FIGS. 4b are an enlarged perspective view and a cross-sectional view of the insulating sheet shown in FIG. 3. Figure 5 is another example of a cross-sectional view of the insulating sheet shown in Figure 4a. FIGS. 6a and FIGS. 6b are a perspective view and a cross-sectional view illustrating other examples of an insulating sheet of a secondary battery of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention to those skilled in the art. Additionally, in the drawings below, the thickness or size of each layer is exaggerated for convenience and clarity of explanation, and like reference numerals in the drawings refer to like elements. As used herein, the term "and/or" includes any one of the listed items and all combinations of one or more thereof. Furthermore, in this specification, the meaning of "connected" refers not only to cases where Member A and Member B are directly connected, but also to cases where Member C is interposed between Member A and Member B so that Member A and Member B are indirectly connected. The terms used herein are for describing specific embodiments and are not intended to limit the invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Additionally, as used herein, "comprise" and/or "comprising" specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. Although terms such as "first," "second," etc. are used in this specification to describe various components, parts, regions, layers, and/or parts, it is obvious that these components, parts, regions, layers, and/or parts should not be limited by these terms. These terms are used solely to distinguish one component, part, region, layer, or part from another region, layer, or part. Accordingly, the first component, part, region, layer, or part described below may refer to the second component, part, region, layer, or part without departing from the teachings of the present invention. Spatial terms such as "beneath," "below," "lower," "above," and "upper" are used to facilitate understanding of one element or feature depicted in the drawings and another element or feature. These spatial terms are intended to facilitate understanding of the invention according to various process or usage states of the invention and are not intended to limit the invention. For example, if an element or feature in the drawings is inverted, an element described as "beneath" or "below" becomes "upper" or "on top." Therefore, "below" is a concept that encompasses "upper" or "below." Herein, parts having similar configurations and operations throughout the specification are given the same reference numerals. Additionally, when a part is described as