CN-122026027-A - Secondary battery and method for manufacturing the same

Abstract

Disclosed are a secondary battery and a method for manufacturing the same. The secondary battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a holder surrounding an outer surface of the electrode assembly, and a case accommodating the electrode assembly and the holder, wherein the holder includes a plurality of grooves through which the electrode assembly is exposed.

Inventors

• HUANG YUZHI

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260512

Application Date

20251017

Priority Date

20241111

Claims (20)

1. 1. A secondary battery, comprising: an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; a holder surrounding an outer surface of the electrode assembly, and A case accommodating the electrode assembly and the holder, Wherein the holder includes a plurality of grooves through which the electrode assembly is exposed.
2. 2. The secondary battery according to claim 1, wherein the case comprises: a housing body including a first opening and a second opening facing the first opening, A first side plate coupled to the first opening, A second side plate coupled to the second opening, A first terminal connected to the electrode assembly and coupled to the first side plate, extending away from the case, and And a second terminal connected to the electrode assembly and coupled to the second side plate, extending away from the case.
3. 3. The secondary battery according to claim 2, further comprising: A first electrode tab electrically connected to the positive electrode, and A second electrode tab electrically connected to the negative electrode, Wherein: The first electrode tab and the second electrode tab face each other, The first electrode tab is connected to the first terminal, and The second electrode tab is connected to the second terminal.
4. 4. The secondary battery according to any one of claims 1 to 3, wherein the holder includes a rigid film.
5. 5. The secondary battery according to any one of claims 1 to 3, wherein the electrode assembly comprises: A pair of first surfaces along a first direction; A pair of second surfaces along a second direction perpendicular to the first direction, and A pair of third surfaces along a third direction perpendicular to each of the first direction and the second direction, Wherein: the area of the pair of second surfaces is larger than the area of the pair of third surfaces, and The retainer surrounds at least a portion of the pair of second surfaces and at least a portion of the pair of third surfaces.
6. 6. The secondary battery according to claim 5, further comprising a first electrode tab and a second electrode tab, each electrically connected to a different one of the pair of first surfaces.
7. 7. The secondary battery according to claim 5, wherein the holder comprises: a first frame surrounding at least a portion of the pair of second surfaces, and A second frame surrounding at least a portion of the pair of third surfaces.
8. 8. The secondary battery according to claim 7, wherein: The pair of second surfaces has a width less than the length of the pair of second surfaces, The first frame includes a plurality of first grooves, and The width of each of the plurality of first grooves is determined based on the width of the pair of second surfaces.
9. 9. The secondary battery according to claim 8, wherein the width of each of the plurality of first grooves is within 17.5% of the width of the pair of second surfaces.
10. 10. The secondary battery according to claim 8, wherein: The pair of third surfaces has a width less than the length of the pair of third surfaces, The second frame includes a plurality of second grooves, and A width of each of the plurality of second grooves is determined based on the width of the pair of third surfaces.
11. 11. The secondary battery according to claim 10, wherein the width of each of the plurality of second grooves is within 35% of the width of the pair of third surfaces.
12. 12. The secondary battery according to claim 10, wherein the number of the plurality of second grooves is smaller than the number of the plurality of first grooves.
13. 13. The secondary battery according to claim 5, wherein a sum of areas of the plurality of grooves is 60% -80% of a sum of areas of the pair of second surfaces and the pair of third surfaces.
14. 14. The secondary battery according to any one of claims 1 to 3, wherein a thickness of the holder is in a range of 4.5mm to 5.0 mm.
15. 15. A method of manufacturing a secondary battery, the method comprising: preparing an electrode assembly comprising a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; A holder arranged to surround an outer surface of the electrode assembly, and The electrode assembly and the holder are accommodated in a case, Wherein the holder includes a plurality of grooves through which the electrode assembly is exposed.
16. 16. The method of claim 15, wherein prior to the disposing of the retainer, the method comprises: Disposing an adhesive member on one surface of the holder, and The plurality of slots are formed by cutting at least a portion of the retainer.
17. 17. The method of claim 15, wherein the retainer comprises a rigid membrane.
18. 18. The method of any one of claims 15 to 17, wherein the electrode assembly comprises: A pair of first surfaces disposed along a first direction; A pair of second surfaces arranged along a second direction perpendicular to the first direction, and A pair of third surfaces disposed along a third direction perpendicular to each of the first direction and the second direction, Wherein: the area of the pair of second surfaces is larger than the area of the pair of third surfaces, and The retainer surrounds at least a portion of the pair of second surfaces and at least a portion of the pair of third surfaces.
19. 19. The method of claim 18, wherein the retainer comprises: a first frame surrounding at least a portion of the pair of second surfaces, and A second frame surrounding at least a portion of the pair of third surfaces, Wherein: The pair of second surfaces has a width less than the length of the pair of second surfaces, The first frame includes a plurality of first grooves, and The width of each of the plurality of first grooves is determined based on the width of the pair of second surfaces.
20. 20. The method according to claim 19, wherein: The pair of third surfaces has a width less than the length of the pair of third surfaces, The second frame includes a plurality of second grooves, and A width of each of the plurality of second grooves is determined based on the width of the pair of third surfaces.

Description

Secondary battery and method for manufacturing the same Technical Field Embodiments relate to a secondary battery and a method for manufacturing the same. Background Unlike primary batteries, which are not designed to be (re) charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and re-charged. Low-capacity secondary batteries are used in portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., electric power storage at home and/or utility scale). A secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The electrode assembly of the secondary battery is connected to the electrode terminal through an electrode tab. Movement of the electrode assembly due to impact applied to the secondary battery may cause breakage of the electrode tab. Accordingly, stability and reliability of the secondary battery may be deteriorated. The above information disclosed in this background section is for enhancement of understanding of the background of the present disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention Embodiments relate to a secondary battery including an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a holder surrounding an outer surface of the electrode assembly, and a case housing the electrode assembly and the holder, wherein the holder includes a plurality of grooves through which the electrode assembly is exposed. The case may include a case body including a first opening and a second opening facing the first opening, a first side plate coupled to the first opening, a second side plate coupled to the second opening, a first terminal connected to the electrode assembly and coupled to the first side plate, extending away from the case, and a second terminal connected to the electrode assembly and coupled to the second side plate, extending away from the case. In some embodiments, the secondary battery may include a first electrode tab electrically connected to the positive electrode, and a second electrode tab electrically connected to the negative electrode, wherein the first electrode tab and the second electrode tab may face each other, the first electrode tab may be connected to the first terminal, and the second electrode tab may be connected to the second terminal. The retainer may comprise a rigid membrane. The electrode assembly may include a pair of first surfaces along a first direction, a pair of second surfaces along a second direction perpendicular to the first direction, and a pair of third surfaces along a third direction perpendicular to each of the first and second directions, wherein an area of the pair of second surfaces may be greater than an area of the pair of third surfaces, and the holder may surround at least a portion of the pair of second surfaces and at least a portion of the pair of third surfaces. In some embodiments, the secondary battery may include a first electrode tab and a second electrode tab each electrically connected to a different one of the pair of first surfaces. The retainer may include a first frame surrounding at least a portion of the pair of second surfaces, and a second frame surrounding at least a portion of the pair of third surfaces. The width of the pair of second surfaces may be smaller than the length of the pair of second surfaces, the first frame may include a plurality of first grooves, and the width of each of the plurality of first grooves may be determined based on the width of the pair of second surfaces. The width of each of the plurality of first grooves may be within 17.5% of the width of the pair of second surfaces. The width of the pair of third surfaces may be smaller than the length of the pair of third surfaces, the second frame may include a plurality of second grooves, and the width of each of the plurality of second grooves may be determined based on the width of the pair of third surfaces. The width of each of the plurality of second grooves may be within 35% of the width of the pair of third surfaces. The number of the plurality of second grooves may be smaller than the number of the plurality of first grooves. The sum of the areas of the plurality of grooves may be 60% -80% of the sum of the areas of the pair of second surfaces and the pair of third surfaces. The thickness of the retainer can be in the range of 4.5 mm-5.0 mm. Embodiments relate to a method of manufacturing a secondary battery including preparing an ele