KR-20260062559-A - SECONDARY BATTERY AND BATTERY PACK

Abstract

The present disclosure relates to a secondary battery, a secondary battery, and a battery pack. The technical problem to be solved is to provide a secondary battery and a battery pack capable of improving the performance, reliability, and stability of the secondary battery by improving the adhesion between the electrode and the separator, thereby suppressing micro shorts and hard shorts by suppressing the formation of by-products and metallic lithium. To this end, the present invention provides a secondary battery comprising a case, an electrode assembly disposed inside the case, a cap assembly coupled to the case and having a first terminal and a second terminal, a current collector disposed between the electrode assembly and the case and electrically connected to the electrode assembly and the first terminal and the second terminal, and a deformation suppressor connecting different sides of the case to suppress thickness deformation of the electrode assembly.

Inventors

• 최영광

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260507

Application Date

20241029

Claims (20)

1. case; An electrode assembly disposed inside the above case; A cap assembly coupled to the above case and having a first terminal and a second terminal; A current collector disposed between the electrode assembly and the case and electrically connected to the electrode assembly, the first terminal and the second terminal; and A secondary battery characterized by including a deformation suppression member that suppresses thickness deformation of the electrode assembly by connecting different sides of the above case.
2. In paragraph 1, The deformation inhibition portion above includes a through-hole portion formed in the center of the electrode assembly; and A secondary battery characterized by including a support formed on the inner surface of the case to penetrate the through hole portion.
3. In paragraph 2, The above through hole is formed in a circular or elliptical shape, and A secondary battery characterized in that the above-mentioned support member is formed to correspond to the shape of the above-mentioned through-hole member.
4. In paragraph 2, The above-mentioned through-hole portion is formed in an isotropic polygonal shape, and A secondary battery characterized in that the above-mentioned support member is formed to correspond to the shape of the above-mentioned through-hole member.
5. In paragraph 2, The above through hole portion is formed in an anisotropic polygonal shape, and A secondary battery characterized in that the above-mentioned support member is formed to correspond to the shape of the above-mentioned through-hole member.
6. In paragraph 2, A secondary battery characterized in that the size of the through hole portion is 10mm to 100mm.
7. In paragraph 2, The above support member is a support projection formed protruding from the inner surface of one long side of the case; and A secondary battery characterized by including a support hole formed on the other long side of the case so as to be coupled with the support protrusion.
8. In Paragraph 7, A secondary battery characterized in that the above-mentioned supporting protrusion is in the shape of a hollow tube.
9. In Paragraph 7, A secondary battery characterized in that the above-mentioned support protrusion is in the shape of a column.
10. In Paragraph 7, A secondary battery characterized in that the end of the above-mentioned support protrusion is joined to the above-mentioned support hole by welding.
11. In Paragraph 7, A secondary battery characterized in that a stepped portion is formed at the end of the support protrusion, which is supported on the inner surface of the other long side of the case.
12. In Paragraph 7, A secondary battery characterized in that the above-mentioned support member includes a binding member that is screw-coupled to the support protrusion through the above-mentioned support hole.
13. In paragraph 2, The above through-hole portion is formed in the electrode and the separator of the electrode assembly, respectively, and A secondary battery characterized in that the through hole formed in the electrode is larger than the through hole formed in the separator.
14. In paragraph 1, The above deformation inhibition part includes a plurality of through-hole portions formed in the electrode assembly; and A secondary battery characterized by including a plurality of support members formed on the inner surface of the case to penetrate the through hole portion.
15. In Paragraph 14, A secondary battery characterized by the number of through holes being 2 to 10.
16. In Paragraph 14, The above through-hole portion is a first through-hole portion formed in the central portion of the electrode assembly; and A secondary battery characterized by including a plurality of second through-hole portions formed at the edge of the electrode assembly.
17. In Paragraph 16, A secondary battery characterized in that the first through-hole portion is larger than the size of the second through-hole portion.
18. In Paragraph 16, The above support member comprises a first support protrusion formed protruding from the inner surface at the center of one long side of the case; A second support projection formed protruding from the inner surface of the long side edge of the above case; A first support hole formed at the center of the other long side of the case so as to be coupled with the first support protrusion; and A secondary battery characterized by including a second support hole formed on the other long side edge of the case so as to be coupled with the second support protrusion.
19. In Paragraph 18, A secondary battery characterized in that one of the first support protrusion and the second support protrusion is tubular in shape and the other is columnary in shape.
20. Housing; and A plurality of secondary batteries disposed inside the above housing; including The above secondary battery is, case; An electrode assembly disposed inside the above case; A cap assembly coupled to the above case and having a first terminal and a second terminal; A current collector disposed between the electrode assembly and the case and electrically connected to the electrode assembly, the first terminal and the second terminal; and A battery pack characterized by including a deformation suppression member that suppresses thickness deformation of the electrode assembly by connecting different sides of the above case.

Description

Secondary Battery and Battery Pack The present disclosure relates to secondary batteries and battery packs. In general, the demand for high-energy-density, high-capacity rechargeable batteries is rapidly increasing in line with the recent rapid proliferation of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles. Accordingly, research and development to improve the performance of lithium-ion batteries is actively underway. A lithium secondary battery is a battery comprising a positive electrode and a negative electrode containing an active material capable of lithium ion intercalation and deintercalation, and an electrolyte, and produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated/deintercalated from the positive electrode and the negative electrode. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a perspective view schematically showing the configuration of a secondary battery according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view schematically showing the configuration of a secondary battery according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, schematically showing the configuration of a secondary battery according to the first embodiment of the present invention. FIG. 4 is a diagram schematically showing the configuration of an electrode assembly according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1, schematically showing the configuration of a deformation suppression part according to the first embodiment of the present invention. FIG. 6 is a perspective view schematically showing the configuration of a deformation suppression part according to the first embodiment of the present invention. FIG. 7 is a schematic diagram showing the isotropic cross-sectional configuration of a deformation suppression part according to the first embodiment of the present invention. FIG. 8 is a diagram schematically showing the anisotropic configuration of a deformation suppression part according to the first embodiment of the present invention. FIG. 9 is a schematic diagram showing the anisotropic cross-sectional configuration of the deformation suppression part according to FIG. 8. FIG. 10 is a first modified example schematically showing the configuration of a support protrusion according to a first embodiment of the present invention. FIG. 11 is a second modified example schematically showing the configuration of a support protrusion according to the first embodiment of the present invention. FIG. 12 is a third modified example schematically showing the configuration of a support member according to the first embodiment of the present invention. FIG. 13 is a perspective view schematically showing the configuration of a secondary battery according to a second embodiment of the present invention. FIG. 14 is an exploded perspective view schematically showing the configuration of a secondary battery according to a second embodiment of the present invention. FIG. 15 is a cross-sectional view taken along line XIV-XIV of FIG. 13, schematically showing the configuration of a deformation suppression part according to a second embodiment of the present invention. FIG. 16 is a schematic diagram showing the isotropic cross-sectional configuration of a deformation suppression part according to a second embodiment of the present invention. FIG. 17 is a schematic diagram showing the anisotropic cross-sectional configuration of a deformation suppression part according to a second embodiment of the present invention. FIG. 18 is a graph showing the heating state of a secondary battery according to various embodiments of the present invention. FIG. 19 is an image showing the transfer salt precipitation of a separator of a secondary battery according to various embodiments of the present invention. FIG. 20 is a schematic perspective view of a battery pack according to various embodiments of the present invention. FIG. 21 is an exploded perspective view schematically showing a battery pack according to various embodiments of the present invention. FIG. 22 is a cross-sectional view XXXII-XXII of FIG. 20 schematically showing a battery pack according to various e