KR-20260066559-A - Rechargeable battery, method for manufacturing rechargeable battery and rechargeable battery module

Abstract

A secondary battery, a method for manufacturing a secondary battery, and a secondary battery module are disclosed. A secondary battery according to the present invention, comprising an electrode assembly and a case for housing the electrode assembly, may include: a plurality of electrode plates included in the electrode assembly; an electrode tab extending from the plurality of electrode plates and cut in a diagonal direction; a terminal portion coupled to a portion of the electrode tab exposed to the upper part of the electrode assembly; and a cap assembly including the terminal portion and coupled to the case.

Inventors

• 권양희

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260512

Application Date

20241104

Claims (20)

1. A secondary battery comprising an electrode assembly and a case housing the electrode assembly, A plurality of electrode plates included in the above electrode assembly; Electrode tabs extending from the plurality of electrode plates and cut in a diagonal direction; A terminal portion coupled to the portion of the electrode assembly exposed above the electrode tab; and A secondary battery comprising a cap assembly that includes the above terminal portion and is coupled to the above case.
2. In paragraph 1, The above electrode tab is, A secondary battery characterized by being folded from the side of the electrode assembly and welded to the electrode assembly.
3. In paragraph 1, The above electrode tab is, A secondary battery characterized by being welded to the inner surface of the terminal portion of the above-described cap assembly.
4. In paragraph 1, A secondary battery characterized by further including an insulator on the upper part of the electrode assembly that insulates between the electrode assembly and the electrode tab.
5. In paragraph 1, The above electrode tab is, A secondary battery characterized by being welded after riveting the terminal part of the above-mentioned cap assembly.
6. In paragraph 5, A secondary battery characterized in that the portion of the electrode tab exposed above the electrode assembly has the shape of a right triangle.
7. In paragraph 6, A secondary battery characterized in that the welding positions of both terminal portions of the cap assembly are each positioned symmetrically on both sides from the upper center of the electrode assembly.
8. In Paragraph 7, A secondary battery characterized in that the base of the shape of the right triangle above is at least three times the diameter of the part where the rivet is welded.
9. In paragraph 8, The above electrode tab is, A secondary battery characterized by the outer corners of the above right-angled triangle shape being cut.
10. In paragraph 1, The above secondary battery is characterized by being prismatic.
11. A step of manufacturing an electrode assembly including a plurality of electrode plates; A step of combining the portion of the electrode tab, which is extended from the plurality of electrode plates and cut diagonally, that is exposed above the electrode assembly with the terminal portion included in the cap assembly; and A method for manufacturing a secondary battery characterized by including the step of accommodating the electrode assembly in a case and combining the cap assembly with the case.
12. In Paragraph 11, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery characterized by including the step of folding the electrode tab from the side of the electrode assembly and welding it to the electrode assembly.
13. In Paragraph 11, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery characterized by including the step of welding the electrode tab to the inner surface of the terminal portion of the cap assembly.
14. In Paragraph 11, A method for manufacturing a secondary battery, further comprising the step of providing an insulator on the upper part of the electrode assembly that insulates between the electrode assembly and the electrode tab.
15. In Paragraph 11, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery characterized by including the step of riveting and welding the electrode tab to the terminal part of the cap assembly.
16. In paragraph 15, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery, characterized by further including the step of forming the portion of the electrode tab exposed above the electrode assembly into the shape of a right triangle.
17. In Paragraph 16, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery, characterized by further including the step of forming the welding positions of both terminal portions of the cap assembly so that they are positioned symmetrically on both sides from the upper center of the electrode assembly.
18. In Paragraph 17, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery, characterized by further including the step of forming the base of the shape of the right triangle above at least three times the diameter of the part where the rivet is welded.
19. In Paragraph 18, The step of combining the portion of the electrode tab exposed above the electrode assembly and the terminal portion included in the cap assembly is A method for manufacturing a secondary battery, characterized by further including the step of cutting the outer corner of the right-angled triangle shape of the electrode tab.
20. A secondary battery module comprising a plurality of secondary batteries described in claim 1 arranged and connected in a transverse or longitudinal direction.

Description

Rechargeable battery, method for manufacturing rechargeable battery and rechargeable battery module The present invention relates to a secondary battery, a method for manufacturing a secondary battery, and a secondary battery module, wherein the electrode tab is cut diagonally so that the electrode tab itself functions as a current collector. Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. A secondary battery includes an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and terminals connected to the electrode assembly. In the assembly of a typical prismatic secondary battery, the electrical connection between the electrode plate and the terminal portion is made by connecting the electrode tab, which is extended and exposed on the electrode plate, to the current collector connected to the terminal portion of the cap assembly. At this time, the electrode tab and the current collector are connected by direct welding. Since laser welding is performed by overlapping the electrode tab and the current collector and facing inward toward the electrode assembly, foreign matter may enter the interior of the electrode assembly or damage to the separator may occur due to laser ingress, and there was a problem that the electrical contact between the electrode tab and the current collector was narrow. 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. 1a is a top perspective view of a conventional prismatic secondary battery. Fig. 1b is a cross-sectional view II of Fig. 1a. FIGS. 2a and FIGS. 2b show the electrical connection structure between a conventional electrode plate and a terminal part. FIGS. 3a to 3d are drawings illustrating the process of manufacturing a secondary battery according to one embodiment of the present invention. FIGS. 4a to 4d are drawings illustrating the process of manufacturing a secondary battery according to another embodiment of the present invention. FIGS. 5a to 5c are enlarged views of the portion exposed above the electrode assembly of an electrode tab of a secondary battery according to another embodiment of the present invention. FIG. 6 is an exemplary diagram of a secondary battery module having a secondary battery arranged according to an embodiment of the present invention. FIG. 7 is an example of a secondary battery pack including the secondary battery module exemplified in FIG. 6. FIG. 8 is a conceptual diagram of a vehicle including a secondary battery pack exemplified in FIG. 7. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. Additionally, as used herein, “comprise, include” and/or “comprising, including” 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. Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical comp