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EP-4742379-A1 - SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME

EP4742379A1EP 4742379 A1EP4742379 A1EP 4742379A1EP-4742379-A1

Abstract

A secondary battery, including an electrode assembly (140) including a positive electrode, a negative electrode, and a separation film between the positive electrode and the negative electrode, a holder (340, 640) that surrounds an outer surface of the electrode assembly (140), and a case accommodating the electrode assembly (140) and the holder (340, 640), wherein the holder (340, 640) includes a plurality of grooves (346, 348, 646, 648) through which the electrode assembly (140) is exposed.

Inventors

  • Hwang, Yusik

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20251020

Claims (15)

  1. A secondary battery (100), comprising: an electrode assembly (140) including a positive electrode, a negative electrode, and a separation film between the positive electrode and the negative electrode; a holder (340, 640) that surrounds an outer surface of the electrode assembly (140); and a case accommodating the electrode assembly (140) and the holder (340, 640), wherein the holder (340, 640) includes a plurality of grooves (346, 348, 646, 648) through which the electrode assembly (140) is exposed.
  2. The secondary battery (100) as claimed in claim 1, wherein the case includes: a case body (110) including a first opening and a second opening facing the first opening, a first side plate (122) coupled to the first opening, a second side plate (124) coupled to the second opening, a first terminal (132) connected to the electrode assembly (140), and coupled to the first side plate (122), extending away from the case, and a second terminal (134) connected to the electrode assembly (140), and coupled to the second side plate (124), extending away from the case.
  3. The secondary battery (100) as claimed in claim 1 or 2, further including: a first electrode tab (142) electrically connected to the positive electrode, and a second electrode tab (144) electrically connected to the negative electrode, wherein: the first electrode tab (142) and the second electrode (144) tab face each other, the first electrode tab (142) is connected to the first terminal (132), and the second electrode tab (144) is connected to the second terminal (134).
  4. The secondary battery (100) as claimed in any of the preceding claims, wherein the holder (340, 640) includes a rigid film.
  5. The secondary battery (100) as claimed in any of the preceding claims, wherein the electrode assembly (140) includes: a pair of first surfaces (310, 610) along a first direction (D1), a pair of second surfaces (320, 620) along a second direction (D2) perpendicular to the first direction (D1), and a pair of third surfaces (330, 630) along a third direction (D3) perpendicular to each of the first direction (D1) and the second direction (D2), wherein: an area of the pair of second surfaces (320, 620) is greater than an area of the pair of third surfaces (330, 630), and the holder (340, 640) surrounds at least a part of the pair of second surfaces (320, 620), and at least a part of the pair of third surfaces (330, 630).
  6. The secondary battery (100) as claimed in claim 5, further including a first electrode tab (142) and a second electrode tab (144) each electrically connected to a different one of the pair of first surfaces (310, 610).
  7. The secondary battery (100) as claimed in claim 5 or 6, wherein the holder (340, 640) includes: a first frame (342, 642) that surrounds at least a part of the pair of second surfaces (320, 620), and a second frame (344, 644) that surrounds at least a part of the pair of third surfaces (330, 630).
  8. The secondary battery (100) as claimed in claim 7, wherein: a width (W1) of the pair of second surfaces (320, 620) is smaller than a length (L1) of the pair of second surfaces (320, 620), the first frame (342, 642) includes a plurality of first grooves (346, 646), and a width (W2) of the plurality of first grooves (346, 646) is determined based on the width (W1) of the pair of second surfaces (320, 620).
  9. The secondary battery (100) as claimed in claim 8, wherein the width (W2) of the plurality of first grooves (346, 646) is within 17.5% of the width (W1) of the pair of second surfaces (320, 620).
  10. The secondary battery (100) as claimed in claim 8 or 9, wherein: a width (W3) the pair of third surfaces (330, 630) is smaller than a length (L1) of the pair of third surfaces (330, 630), the second frame (344, 644) includes a plurality of second grooves (348, 648), and a width (W4) of the plurality of second grooves (348, 648) is determined based on the width (W3) of the pair of third surfaces (330, 630).
  11. The secondary battery (100) as claimed in claim 10, wherein the width (W4) of the plurality of second grooves (348, 648) is within 35% of the width (W3) of the pair of third surfaces (330, 630).
  12. The secondary battery (100) as claimed in claim 10 or 11, wherein a number of the plurality of second grooves (348, 648) is smaller than a number of the plurality of first grooves (346, 646).
  13. The secondary battery (100) as claimed in any of the claims 5 to 12, wherein a sum of areas of the plurality of grooves (346, 348, 646, 648) is 60% to 80% of a sum of areas of the pair of second surfaces (320, 620) and the pair of third surfaces (330, 630).
  14. The secondary battery (100) as claimed in any of the preceding claims, wherein a thickness of the holder (340, 640) is 4.5 mm to 5.0 mm.
  15. A manufacturing method of a secondary battery (100), the method comprising: preparing an electrode assembly (140) including a positive electrode, a negative electrode, and a separation film between the positive electrode and the negative electrode; arranging a holder (340, 640) to surround an outer surface of the electrode assembly (140); and accommodating the electrode assembly (140) and the holder (340, 640) inside a case, wherein the holder (340, 640) includes a plurality of grooves (346, 348, 646, 648) through which the electrode assembly (140) is exposed.

Description

BACKGROUND 1. Field The present invention relates to a secondary battery and a method for manufacturing the same. 2. Description of Related Art Unlike primary batteries that are not designed to be (re)charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable, small electronic devices, such as smart phones, feature phones, notebook computers, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing power (e.g., home and/or utility scale power storage). A secondary battery generally includes an electrode assembly composed of a positive electrode and a negative electrode, a case accommodating the same, and electrode terminals connected to the electrode assembly. An electrode assembly of a secondary battery is connected to an electrode terminal through an electrode tab. Due to the impact applied to the secondary battery, movements of the electrode assembly may cause the electrode tab to break. Accordingly, the 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 invention, and therefore, it may contain information that does not constitute related (or prior) art. SUMMARY The present invention is directed to a secondary battery, including an electrode assembly including a positive electrode, a negative electrode, and a separation film between the positive electrode and the negative electrode, a holder that surrounds 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. 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 holder may include a rigid film. 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 direction and the second direction, 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 part of the pair of second surfaces, and at least a part 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 holder may include a first frame that surrounds at least a part of the pair of second surfaces and a second frame that surrounds at least a part of the pair of third surfaces. A width the pair of second surfaces may be smaller than a length of the pair of second surfaces, the first frame may include a plurality of first grooves, and a width of the plurality of first grooves may be determined based on the width of the pair of second surfaces. The width of the plurality of first grooves may be within 17.5% of the width of the pair of second surfaces. A width the pair of third surfaces may be smaller than a length of the pair of third surfaces, the second frame may include a plurality of second grooves, and a width of the plurality of second grooves may be determined based on the width of the pair of third surfaces. The width of the plurality of second grooves may be within 35% of the width 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. A sum of areas of the plurality of grooves may be 60% to 80% of a sum of areas of the pair of second surfaces and the pair of third surfaces. A thickness of the holder may be 4.5 mm to 5.0 mm. The present invention is directed to a manufacturing method of a secondary battery, the method including preparing an electrode assembly including a positive electrode, a negative electrode, and a separation film between