KR-20260067799-A - SECONDARY BATTERY AND BATTERY PACK INCLUDING THE SAME

Abstract

The present disclosure relates to a secondary battery and a battery pack including the same. The technical problem to be solved is to provide a secondary battery and a battery pack including the same, wherein a notching portion is formed on a current collector plate that serves as an electrical passage to secure a flow path for relieving internal pressure in the event of a short circuit. To this end, the present disclosure provides a secondary battery comprising: a case; a cap assembly disposed inside the case and coupled to an electrode assembly case having a non-contained portion and positioned facing the electrode assembly; a first current collector plate coupled to a non-contained portion disposed between the electrode assembly and the cap assembly; and a notching portion formed to avoid the welding line between the first current collector plate and the non-contained portion, and which breaks when internal pressure occurs.

Inventors

• 권준환
• 송치훈
• 강봉근
• 김영호
• 김진환
• 김정현
• 이정수
• 조영재

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260513

Application Date

20241106

Claims (20)

1. case; An electrode assembly disposed inside the above case and equipped with a non-removable portion; A cap assembly coupled to the above case and positioned facing the electrode assembly; A first current collector plate disposed between the electrode assembly and the cap assembly and coupled to the uncoated portion; and A secondary battery characterized by including a notching portion formed by avoiding the welding line of the first current collection plate and the non-contained portion, and which breaks when internal pressure is generated.
2. In Article 1, A secondary battery characterized in that the above notching portion includes a center notch formed in the center of the first current collection plate.
3. In Paragraph 2, A secondary battery characterized by having a center hole provided inside the center notch.
4. In Paragraph 2, A secondary battery characterized by the above-mentioned center notch being divided into n equal parts.
5. In Article 1, A secondary battery characterized in that the above notching portion includes a plurality of side notches formed at the edge of the first current collection plate.
6. In Paragraph 5, A secondary battery characterized in that the above-mentioned side notch is formed between a plurality of side holes formed in the first current collection plate.
7. In Paragraph 5, A secondary battery characterized in that the above-mentioned side notch surrounds a side hole formed in the above-mentioned first current collection plate.
8. In Article 7, A secondary battery characterized in that the above-mentioned side notch is in a fan shape that surrounds a plurality of the above-mentioned side holes.
9. In Article 1, A secondary battery characterized in that the above notching portion is an intaglio groove formed by laser cutting or die stamping.
10. In Article 1, A secondary battery characterized in that the intaglio formation angle of the above-mentioned notching portion is 30° to 90°.
11. In Article 1, A secondary battery characterized in that the amount of indentation of the above notching portion is 50% to 80% relative to the thickness of the first current collector plate.
12. In Article 1, The above notching portion is a center notch formed at the center of the first current collector plate; and A secondary battery characterized by including a side notch formed at the edge of the first current collection plate and connected to the center notch.
13. In Paragraph 12, The above center notch is formed in a circular shape, and A secondary battery characterized in that the above-mentioned side notch is formed in a bar shape extending in the radial direction of the above-mentioned center notch.
14. In Paragraph 12, The above center notch is formed in a circular shape, and A secondary battery characterized in that the above-mentioned side notch is formed in a fan shape extending in the radial direction of the above-mentioned center notch.
15. In Paragraph 12, A secondary battery characterized in that the above-mentioned side notches are formed in multiple numbers extending in the radial direction of the above-mentioned center notch.
16. In Paragraph 12, A secondary battery characterized in that the thickness of the center notch is thicker than the thickness of the side notch.
17. In Paragraph 16, A secondary battery characterized in that the wall thickness of the side notch is 15% to 30% relative to the thickness of the first current collector plate.
18. In Paragraph 16, A secondary battery characterized in that the wall thickness of the side notch is 50% or less of the wall thickness of the center notch.
19. In Article 1, A secondary battery characterized by including a second current collector plate disposed between the above case and the above electrode assembly.
20. Housing; A plurality of secondary batteries disposed inside the above housing; including The above secondary battery is a case; An electrode assembly disposed inside the above case and equipped with a non-removable portion; A cap assembly coupled to the above case and positioned facing the electrode assembly; A first current collector plate disposed between the electrode assembly and the cap assembly and coupled to the non-removable portion; and A battery pack characterized by including a notching portion formed by avoiding the welding line of the first current collection plate and the non-contained portion, and which breaks when internal pressure is generated.

Description

Secondary battery and battery pack including the same The present disclosure relates to a secondary battery and a battery pack including the same. 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 a cross-sectional view schematically showing the configuration of a secondary battery according to the first embodiment of the present invention. FIG. 3 is an enlarged view of the key parts schematically showing the configuration of a secondary battery according to the first embodiment of the present invention. FIG. 4 is a plan view schematically showing the center notch configuration of the first current collection plate according to the first embodiment of the present invention. Figure 5 is a cross-sectional view taken along line V-V of Figure 4. FIG. 6 is a drawing showing a modified example of the center notch of the first current collection plate according to the first embodiment of the present invention. FIG. 7 is a plan view schematically showing the side notch configuration of the first current collection plate according to the second embodiment of the present invention. Figure 8 is a cross-sectional view of Figure 7 along lines VIII-VIII. FIG. 9 is a plan view schematically showing the side notch configuration of the first current collection plate according to the third embodiment of the present invention. FIG. 10 is a cross-sectional view along X-X of FIG. 9. FIGS. 11 and FIGS. 12 are drawings showing a modified example of the side notch of the first current collection plate according to the third embodiment of the present invention. FIG. 13 is a schematic diagram showing the configuration of the notching portion of the first current collection plate according to the fourth embodiment of the present invention. FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13. FIG. 15 is a first modified example of the notching portion of the first current collection plate according to the fourth embodiment of the present invention. FIG. 16 is a cross-sectional view taken along XVI-XVI of FIG. 15. FIG. 17 is a drawing showing a second modified example of the notching portion of the first current collection plate according to the fourth embodiment of the present invention. FIG. 18 is a perspective view schematically showing the configuration of a secondary battery according to the fifth embodiment of the present invention. FIG. 19 is a cross-sectional view schematically showing the configuration of a secondary battery according to the fifth embodiment of the present invention. FIG. 20 is an enlarged view of the key parts schematically showing the configuration of a secondary battery according to the fifth embodiment of the present invention. FIG. 21 is a plan view schematically showing the configuration of the notching portion of the first current collection plate according to the fifth embodiment of the present invention. FIG. 22 is a cross-sectional view of ⅡⅩⅡ-ⅡⅩⅡ of FIG. 21. FIG. 23 is a plan view schematically showing the configuration of the notching portion of the first current collection plate according to the sixth embodiment of the present invention. FIG. 24 is a cross-sectional view of ⅡⅩⅣ-ⅡⅩⅣ of FIG. 23. FIG. 25 is a drawing showing a modified example of the notching portion of the first current collection plate according to the 6th embodiment of the present invention. FIG. 26 is a perspective view schematically showing the configuration of a battery pack according to various embodiments of the present inventio