KR-20260066438-A - Secondary battery and battery pack including the same

Abstract

The present invention relates to a secondary battery and a battery pack including the same. A secondary battery according to one aspect of the present invention may include an electrode assembly extending in one direction; a cap covering one side of the extension direction of the electrode assembly; an outer film wrapping the electrode assembly in a circumferential direction; and a fixing member provided on the outer circumferential surface of the electrode assembly and coupled to the outer film and the electrode assembly, respectively.

Inventors

• 이재호
• 최지은
• 김상훈
• 황지영
• 이지선
• 이민규

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260512

Application Date

20241104

Claims (20)

1. Electrode assembly extended in one direction; A cap covering one side in the extension direction of the above electrode assembly; An outer film that wraps the electrode assembly in a circumferential direction; and A secondary battery comprising a fixing member provided on the outer circumference of the electrode assembly and respectively coupled to the outer film and the electrode assembly.
2. In Article 1, The above outer perimeter surface is, It includes a first surface facing the outside of the electrode assembly, The above-mentioned fixing member is, A secondary battery comprising a first fixing member provided on the first surface.
3. In Article 2, The above electrode assembly is, It includes a plurality of stacked electrodes and a separator, and The above-mentioned first surface is, A secondary battery formed parallel to the stacking direction of the plurality of electrodes and separators.
4. In Paragraph 3, The above-mentioned first surface is, A secondary battery facing a direction perpendicular to the stacking direction above.
5. In Paragraph 3, A secondary battery in which the stacking direction is perpendicular to the extension direction of the electrode assembly.
6. In Article 2, The above outer perimeter surface is, It includes a second surface facing the first surface, and The above-mentioned fixing member is, A secondary battery comprising a second fixing member provided on the second surface.
7. In Article 2, The above outer perimeter surface is, It includes a third surface perpendicular to the first surface, and The above-mentioned fixing member is, A secondary battery comprising a third fixing member provided on the third surface.
8. In Article 7, The above outer perimeter surface is, It includes a fourth surface facing the third surface, and The above-mentioned fixing member is, A secondary battery comprising a fourth fixing member provided on the fourth surface.
9. In Article 1, The above-mentioned fixed member is a secondary battery that extends parallel to the extension direction of the electrode assembly.
10. In Article 1, The above-mentioned fixing member is a secondary battery having a predetermined adhesive force.
11. In Article 10, One side of the above-mentioned fixed member is attached to the outer circumference of the above-mentioned electrode assembly, and The other side of the above-mentioned fixed member is a secondary battery attached to the above-mentioned exterior film.
12. In Article 10, The above-mentioned fixing member is a secondary battery having a film or sheet shape.
13. In Article 1, The above-mentioned fixing member is composed of a plurality of members, and The above plurality of fixed members are arranged along the circumference of the electrode assembly, forming a secondary battery.
14. Electrode assembly extended in one direction; A fixing member that surrounds the above electrode assembly in a circumferential direction; A cap covering one side in the extension direction of the electrode assembly; and It includes an outer film that wraps the above-mentioned fixed member and the above-mentioned electrode assembly, and The above fixing member is a secondary battery that is respectively coupled to the electrode assembly and the outer film.
15. In Article 14, The above-mentioned fixing member is a secondary battery having a ring shape.
16. In Article 14, The above exterior film is a secondary battery that wraps the above fixing member and the above electrode assembly in the above circumferential direction.
17. In Article 14, The above-mentioned fixing member is composed of a plurality of members, and The above plurality of fixed members are arranged along the extension direction of the electrode assembly, forming a secondary battery.
18. In Article 14, A secondary battery, wherein the fixed member is provided with a flow portion through which an electrolyte can pass.
19. In Article 18, The above-mentioned fluid portion is a secondary battery that extends parallel to the extension direction of the electrode assembly.
20. In Article 19, The above-mentioned fluid portion is a secondary battery that extends from one end of the fixed member to the other end with respect to the extension direction of the electrode assembly.

Description

Secondary battery and battery pack including the same The present invention relates to a secondary battery and a battery pack, and more specifically, to a secondary battery and a battery pack capable of charging and discharging electrical energy. Although secondary batteries have been applied in small-scale fields such as mobile devices and laptop computers, research directions have recently expanded to medium and large-scale fields, and they are widely used in fields requiring high voltage and large capacity, such as Energy Storage Systems (ESS) and Electric Vehicles (EV). Battery packs can be formed by packaging battery cells made of these secondary batteries. Generally, a secondary battery consists of an electrode assembly in which electrodes and a separator are laminated to charge and discharge electrical energy, a case housing the electrode assembly, and conductive electrode leads for conducting electricity to the outside. In this case, the secondary battery can be classified into a cylindrical secondary battery, a pouch-type secondary battery, or a prismatic secondary battery depending on the shape of the case. Meanwhile, secondary batteries and battery packs can be subjected to external shocks or vibrations during use. For example, battery packs loaded into electric vehicles to provide power are highly likely to be subjected to strong shocks or periodic vibrations while driving. Such shocks or vibrations can deform the electrode assembly or cause it to deviate from its rated position within the case. Accordingly, there is an urgent need for the development of secondary batteries with improved structural stability and battery packs containing them. FIG. 1 is a perspective view of a battery pack according to a first embodiment of the present invention, viewed from above. In this case, the packaging is indicated by a dotted line, and the components visible therefrom are indicated by a solid line. FIG. 2 is a perspective view of a secondary battery according to a first embodiment of the present invention, viewed from above. FIG. 3 is an exploded perspective view of a secondary battery according to a first embodiment of the present invention. Figure 4 is a cross-sectional view according to II of Figure 2. FIG. 5 is a cross-sectional view along II-II of FIG. 2. FIG. 6 is an exploded perspective view of a secondary battery according to a second embodiment of the present invention. FIG. 7 is a plan view of an electrode assembly and a fixing member of a secondary battery according to a second embodiment of the present invention. FIG. 8 is a cross-sectional view of a secondary battery according to a second embodiment of the present invention, cut along line II-II of FIG. 2. Figure 9 is an enlarged view of part A of Figure 8. FIG. 10 is a plan view of an electrode assembly and a fixing member of a secondary battery according to a third embodiment of the present invention. FIG. 11 is an enlarged view of the portion corresponding to part A of FIG. 9 in a vertical cross-section of a secondary battery according to the fourth embodiment of the present invention. Preferred embodiments of the present invention are described in detail so that those skilled in the knowledge can easily implement them. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments. In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification. In addition, terms or words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. FIG. 1 is a perspective view of a battery pack according to a first embodiment of the present invention viewed from above. In this case, the packaging is indicated by a dotted line, and the components visible therefrom are indicated by a solid line. FIG. 1 discloses a battery pack according to a first embodiment of the present invention. Referring to FIG. 1, the battery pack (1) according to the first embodiment of the present invention may be a battery pack for charging and discharging electrical energy. To this end, the battery pack (1) according to the first embodiment of the present invention may include a secondary battery (3). In this embodiment, the secondary batteries (3) may be composed of a plurality of units. The plurality of secondary batteries (3) may be arranged in a