KR-20260063398-A - SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME

Abstract

The present disclosure provides a secondary battery. The secondary battery comprises an electrode assembly including a positive electrode, a separator, and a negative electrode; a case body that accommodates the electrode assembly and has one side open; a cover coupled to the open side of the case body; and a positive terminal connected to the positive electrode and coupled to the other side of the case body, wherein the positive terminal comprises a fastening member inserted into a through hole in the other side of the case body and a sealing member disposed between the case body and the fastening member on the outside of the other side of the case body, and the sealing member comprises a vent portion.

Inventors

• 김소윤

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260507

Application Date

20241030

Claims (20)

1. An electrode assembly comprising an anode, a separator, and a cathode; A case body having one side open and accommodating the above electrode assembly; A cover coupled to an open side of the above case body; and A positive terminal connected to the above positive electrode and coupled to the other side of the case body. Includes, The above positive terminal is, A fastening member inserted into a through hole on the other side of the case body; and A sealing member disposed between the case body and the fastening member on the outer side of the other surface of the case body. Includes, The above sealing member is a secondary battery including a vent portion.
2. In paragraph 1, A secondary battery having a melting point of 120°C to 125°C for the vent portion.
3. In paragraph 1, The above-mentioned fastening member is, A head portion located on the outer side of the above case body; and An extension part extending from the head portion to the inside of the case body and inserted into the through hole A secondary battery including
4. In paragraph 3, The above sealing member is a secondary battery disposed between the case body and the head portion.
5. In paragraph 3, The above vent part is, A first vent portion disposed between the lower side of the head portion and the case body; and A second vent portion disposed between the outer side of the extension portion and the case body. A secondary battery including
6. In paragraph 5, The above sealing member is, A rim portion positioned at the edge of the first vent portion. Includes more, A secondary battery in which the melting point of the above-mentioned rim portion is higher than the melting point of the above-mentioned first vent portion.
7. In paragraph 6, The upper surface of the above-mentioned edge portion is higher than the upper surface of the above-mentioned first vent portion, and A secondary battery in which the upper surface of the head portion is higher than the upper surface of the rim portion.
8. In paragraph 5, A secondary battery in which the width of the first vent portion is greater than the width of the head portion.
9. In paragraph 5, A secondary battery in which the corner curvature of the first vent portion is smaller than the corner curvature of the head portion.
10. In paragraph 1, The above case body is a secondary battery comprising an alloy material.
11. In paragraph 1, The above sealing member comprises an insulating material, in a secondary battery.
12. In paragraph 1, The above sealing member comprises a thermoplastic resin, a secondary battery.
13. In paragraph 3, The above positive terminal is, A terminal plate connected to the above positive electrode and disposed inside the case body Includes more, A secondary battery, wherein the extension portion penetrates the terminal plate and is coupled to the terminal plate.
14. In Paragraph 13, The above positive terminal is, An insulating member disposed between the terminal plate and the case body Includes more, A secondary battery, wherein the above extension penetrates the insulating member and is coupled with the insulating member.
15. In Paragraph 14, A secondary battery in which the width of the insulating member is greater than the width of the terminal plate.
16. In Paragraph 14, A secondary battery, wherein at least a portion of the lower surface of the insulating member is recessed corresponding to the upper side of the terminal plate.
17. In Paragraph 14, A secondary battery in which at least a portion of the insulating member is made of the same material as the vent portion.
18. In Paragraph 13, A fixing member coupled to the lower surface of the terminal plate and the extension portion A secondary battery that further includes
19. In Paragraph 13, The above vent part is, A first vent portion disposed between the lower side of the head portion and the case body; and A second vent portion disposed between the outer side of the extension portion and the case body. Includes, A secondary battery, wherein at least a portion of the second vent portion is disposed between the outer side of the extension portion and the terminal plate.
20. A step of inserting an electrode assembly including a positive electrode, a separator, and a negative electrode into a case body with one side open; A step of connecting a positive terminal to the positive terminal and coupling it to the other side of the case body; and Step of attaching a cover to the open one side of the above case body Includes, The above positive terminal is, A fastening member inserted into a through hole on the other side of the case body; and A sealing member disposed between the case body and the fastening member on the outer side of the other surface of the case body. Includes, A method for manufacturing a secondary battery, wherein the sealing member includes a vent portion.

Description

Secondary Battery and Method for Manufacturing the Same The present disclosure relates to a secondary battery and a method for manufacturing a secondary battery. 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. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly. Gas may be generated inside a secondary battery as it undergoes charging and/or discharging. In this case, the internal gas can cause deformation of the electrode assembly, which may lead to a short circuit within the assembly. Consequently, there is a problem in that the secondary battery may ignite, thereby compromising its safety. 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 an exploded perspective view showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 2 is a drawing showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 3 is an exploded view showing an example of a positive terminal according to one embodiment of the present disclosure. FIG. 4 is a cross-sectional view showing an example of a positive terminal according to one embodiment of the present disclosure. FIG. 5 is a cross-sectional view showing an example of a sealing member according to one embodiment of the present disclosure. FIG. 6 is a front view showing the appearance of an anode terminal according to an embodiment of the present disclosure. FIG. 7 is a drawing showing an example in which an internal gas is discharged by melting a sealing member according to one embodiment of the present disclosure. FIG. 8 is a drawing showing an example in which an internal gas is discharged by melting a sealing member according to one embodiment of the present disclosure. FIG. 9 is a drawing showing an example in which an internal gas is discharged by melting a sealing member according to one embodiment of the present disclosure. FIG. 10 is a flowchart illustrating an example of a method for manufacturing a secondary battery according to one embodiment of the present disclosure. 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, 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 components in different embodiments. 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 components in different embodiments. The statement tha