KR-20260063710-A - Secondary Battery and Method for Manufacturing the Same

Abstract

The present disclosure relates to a secondary battery and provides a secondary battery and a method for manufacturing the secondary battery that can improve the electrical stability of the secondary battery by fixing the separator by a sewing method to restrict the movement of the separator. To this end, the present disclosure may include an electrode assembly comprising a positive plate, a negative plate, and a separator, and a fixing part that fixes the separator by sewing, which is installed on the edge of the electrode assembly and does not come into direct contact with the positive plate and the negative plate.

Inventors

• 김동현
• 서예진
• 문은정

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260507

Application Date

20241031

Claims (20)

1. An electrode assembly comprising a positive plate, a negative plate, and a separator; and A secondary battery comprising: a fixing part that is installed on the edge of the electrode assembly and fixes the separator, which does not come into direct contact with the positive plate and the negative plate, by sewing;
2. In paragraph 1, A secondary battery characterized in that the above electrode assembly is formed in a stacked or wound type.
3. In paragraph 1, A secondary battery characterized by the above-mentioned fixing part being sewn using heat-resistant thread.
4. In paragraph 3, A secondary battery characterized in that the heat-resistant fiber above is made of aramid fiber, polyimide fiber, or glass fiber.
5. In paragraph 1, The above electrode assembly has a structure in which a plurality of separator layers are stacked, and the fixing part is characterized by fixing the separator by sewing it in the vertical direction.
6. In paragraph 1, A secondary battery comprising: a first fixing part located between the upper end of the negative plate and the upper end of the separator, and which fixes the separator by sewing.
7. In paragraph 6, A secondary battery comprising: a first fixing part that forms a sewing line in the width direction of the electrode assembly and a first sealing line that fixes the separator.
8. In Paragraph 7, A secondary battery characterized by further including: a first fixing part forming an additional seam line below the first seam line and a second seam line that additionally fixes the separator.
9. In paragraph 1, A secondary battery comprising: a second fixing part located between the lower end of the negative plate and the lower end of the separator, and which fixes the separator by sewing.
10. In Paragraph 9, A secondary battery comprising: a second fixing part, which forms a seam line in the width direction of the electrode assembly and a third seam line that fixes the separator.
11. In Paragraph 10, A secondary battery characterized by further including: a second fixing part, which forms an additional seam line below the third seam line and additionally fixes the separator.
12. An alignment step of installing a guide jig on the outer side of an electrode assembly including a positive plate, a negative plate, and a separator to restrict the movement of the electrode assembly; A first guide installation step in which a first guide is installed at a position facing one end in the longitudinal direction of the electrode assembly; A first sewing step of fixing one longitudinal side of the separator that does not directly face the positive and negative plates by sewing; A second guide installation step in which a second guide is installed at a position facing the other end in the longitudinal direction of the electrode assembly; and A method for manufacturing a secondary battery comprising: a second sewing step of fixing the other longitudinal side of the separator that does not directly face the positive plate and the negative plate by sewing.
13. In Paragraph 12, A method for manufacturing a secondary battery further comprising a first vision inspection step of inspecting both longitudinal sides of the electrode assembly prior to the first sewing step.
14. In Paragraph 12, A method for manufacturing a secondary battery, further comprising a second vision inspection step of inspecting both longitudinal sides of the electrode assembly after the second sewing step.
15. In Paragraph 12, A method for manufacturing a secondary battery, characterized in that the above guide jig is installed on at least one of both sides in the width direction and both sides in the length direction of the electrode assembly.
16. In Paragraph 12, A method for manufacturing a secondary battery, characterized in that the first guide is in the shape of a plate extended in the vertical direction and moves in the vertical direction to guide the electrode assembly.
17. In Paragraph 12, A method for manufacturing a secondary battery, wherein the first sewing step is characterized by sewing the separator located in a first region between one end in the longitudinal direction of the cathode plate and one end in the longitudinal direction of the separator.
18. In Paragraph 12, A method for manufacturing a secondary battery, wherein the second sewing step is characterized by sewing the separator located in a second region between the longitudinal end of the negative plate and the longitudinal end of the separator.
19. In Paragraph 12, A method for manufacturing a secondary battery, characterized in that, in the first sewing step and the second sewing step, a sewing line where a heat-resistant thread is located and a spacing line where a heat-resistant thread is not located are alternately installed.
20. In Paragraph 12, A method for manufacturing a secondary battery, characterized in that, in the first sewing step and the second sewing step, a sewing line where a heat-resistant thread is located is installed consecutively in the width direction of the separator.

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 energy 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. 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 illustrating a secondary battery according to one embodiment of the present invention. FIG. 2 is a perspective view showing an electrode assembly separated from a case according to one embodiment of the present invention. FIG. 3 is a plan view illustrating an electrode assembly according to one embodiment of the present invention in a state fixed by a fixing part. FIG. 4 is an exploded perspective view of an electrode assembly according to one embodiment of the present invention. FIG. 5 is a side view illustrating an electrode assembly according to one embodiment of the present invention in a state fixed by a fixing part. FIG. 6 is a side view illustrating the installation state of the first fixing part according to one embodiment of the present invention. FIG. 7 is a side view illustrating the installation state of the second fixing part according to one embodiment of the present invention. FIG. 8 is a perspective view illustrating the state in which an electrode assembly is aligned by a guide jig according to one embodiment of the present invention. FIG. 9 is a perspective view illustrating the state of inspecting a first area by a vision inspection device according to one embodiment of the present invention. FIG. 10 is a perspective view illustrating a state in which one side in the longitudinal direction of an electrode assembly is aligned by a first guide according to an embodiment of the present invention. FIG. 11 is a perspective view illustrating the state in which an electrode assembly of a first region is sewn by a sewing machine according to one embodiment of the present invention. FIG. 12 is a perspective view illustrating a state in which a first fixing part is installed in a first region according to an embodiment of the present invention. FIG. 13 is a perspective view illustrating the state in which an electrode assembly of a second region is sewn by a sewing machine according to one embodiment of the present invention. FIG. 14 is a perspective view illustrating a state in which a first fixed part according to one embodiment of the present invention is installed and inspected by a vision inspection machine. FIG. 15 is a flowchart illustrating a method for manufacturing a secondary battery according to one embodiment of the present invention. FIG. 16 is a plan view illustrating a state in which a fixing part is installed in an electrode assembly according to another embodiment of the present invention. FIG. 17 is a side view of an electrode assembly according to another embodiment of the present invention. FIG. 18 is a plan view illustrating a state in which a plurality of suture lines are installed in an electrode assembly according to another embodiment of the present invention. FIG. 19 is a side view illustrating a state in which a plurality of suture lines are installed in an electrode assembly according to another embodiment of the present invention. FIG. 20 is a plan view illustrating a state in which sewing lines are installed consecutively in the width direction in an electrode assembly according to another embodiment of the present invention. FIG. 21 is a cross-sectional view showing one end in the longitudinal direction of an electrode assembly according to another embodiment of the present invention. FIG. 22 is a cross-sectional view illustrating the other end in the longitudinal direction of an electrode assembly according to another embodiment of the present invention. FIG. 23 is a cross-sectional view illust