Search

KR-102963308-B1 - SECONDARY BATTERY

KR102963308B1KR 102963308 B1KR102963308 B1KR 102963308B1KR-102963308-B1

Abstract

A secondary battery comprises an electrode assembly including a first electrode and a second electrode spaced apart from the first electrode; a case connected to the first electrode and including an opening that accommodates the electrode assembly and exposes the electrode assembly; a cap plate coupled to the case and including a through hole that covers an outer area of the opening and exposes a central area of the opening; a terminal plate located between the cap plate and the electrode assembly, covering the central area of the opening and connected to the second electrode; and a sealing portion located between the cap plate and the terminal plate and joining the cap plate and the terminal plate.

Inventors

  • 이종하
  • 전병민

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260508
Application Date
20200421

Claims (15)

  1. An electrode assembly comprising a first electrode and a second electrode spaced apart from the first electrode; A case connected to the first electrode, housing the electrode assembly, and including an opening that exposes the electrode assembly; A cap plate that combines with the above case to cover the outer area of the opening and includes a through hole that exposes the central area of the opening; A terminal plate positioned between the cap plate and the electrode assembly, covering the central region of the opening, and connected to the second electrode; and A sealing portion located between the cap plate and the terminal plate, which joins the cap plate and the terminal plate. Includes, The above terminal plate is, A flange portion overlapping with the above-mentioned cap plate; and A terminal portion protruding from the flange portion corresponding to the through hole, wherein the height of the end portion is different from the height of the surface of the cap plate. Includes, The height of the end portion of the terminal part from the electrode assembly is lower than the height of the surface of the cap plate from the electrode assembly, The end of the terminal portion is a secondary battery located inside the through hole of the cap plate.
  2. In paragraph 1, The above flange portion is a secondary battery having a larger area than the above terminal portion.
  3. In paragraph 2, The above flange portion contacts the above seal portion, and The above terminal portion is a secondary battery that does not come into contact with the above sealing portion.
  4. In paragraph 2, The above flange portion is a secondary battery parallel to the above cap plate.
  5. delete
  6. delete
  7. In paragraph 1, The above terminal portion is a secondary battery integrated with the above flange portion.
  8. In Paragraph 7, The thickness of the terminal portion is thicker than the thickness of the flange portion of the secondary battery.
  9. In paragraph 8, The above terminal plate is a secondary battery comprising forged aluminum.
  10. In Paragraph 7, A secondary battery in which the thickness of the terminal portion is the same as the thickness of the flange portion.
  11. In Paragraph 10, The above terminal plate is a secondary battery comprising drawing-processed stainless steel.
  12. In paragraph 1, One end of the electrode assembly faces the case, and The other end of the above electrode assembly is a secondary battery facing the above flange portion.
  13. In Paragraph 12, The above electrode assembly is, A separator located between the first electrode and the second electrode; A first electrode tab connecting the first electrode and the case and in contact with the case; and A second electrode tab connecting the second electrode and the terminal plate and in contact with the flange portion A secondary battery containing additional
  14. In Paragraph 13, The above flange portion is a secondary battery located between the second electrode tab and the sealing portion.
  15. In paragraph 1, The above sealing portion is a secondary battery that insulates the cap plate and the terminal plate.

Description

Secondary Battery This description relates to secondary batteries. Generally, a secondary battery is a battery that can be charged and discharged. Recently, as the demand for wearable devices such as headphones, earphones, smartwatches, and body-attached medical devices using wireless communication such as Bluetooth has increased, the need for ultra-small secondary batteries installed in wearable devices is increasing. Considering that such ultra-small secondary batteries are mounted in wearable devices, they need to have high structural stability against external impacts applied to the secondary battery when the wearable device is flipped over or dropped during use. FIG. 1 is a perspective view showing a secondary battery according to one embodiment. Figure 2 is a cross-sectional view along line II-II of Figure 1. Figure 3 is an enlarged cross-sectional view of part A of Figure 2. FIG. 4 is a cross-sectional view showing a secondary battery according to another embodiment. FIG. 5 is a cross-sectional view showing a secondary battery according to another embodiment. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Hereinafter, a secondary battery according to one embodiment will be described with reference to FIGS. 1 to 3. A secondary battery according to one embodiment is a micro secondary battery and may be a coin cell or a button cell, but is not limited thereto and may be a cylindrical or pin-shaped battery. Here, a coin-type battery or a button-type battery refers to a battery in the shape of a thin coin or button, and may mean a battery in which the ratio of height (H) to diameter (D) (H/D) is 1 or less, but is not limited thereto. A coin-type battery or a button-type battery may have a horizontal cross-section that is circular, but is not limited thereto, and may have a horizontal cross-section that is elliptical or polygonal, etc. FIG. 1 is a perspective view showing a secondary battery according to one embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. Referring to FIGS. 1 and 2, a secondary battery (1000) according to one embodiment includes an electrode assembly (100), a case (200), a cap plate (300), a terminal plate (400), and a sealing part (500). The electrode assembly (100) is housed in a case (200). One end (101), which is the lower part of the electrode assembly (100), faces the bottom of the case (200), and the other end (102), which is the upper part of the electrode assembly (100), faces the flange portion (410) of the terminal plate (400) that covers the opening (210) of the case (200). The one end (101) and the other end (102) of the electrode assembly (100) may have a planar shape parallel to each other, but are not limited thereto. The electrode assembly (100) includes a first electrode (110), a second electrode (120), a separator (130), a first electrode tab (140), and a second electrode tab (150). The first electrode (110) and the second electrode (120) are spaced apart from each other, and a separator (130) containing an insulating material is located between the first electrode (110) and the second electrode (120). The first electrode (110) may be an anode and the second electrode (120) may be a cathode, but is not limited thereto, and the first electrode (110) may be an anode and the second electrode (120) may be a cathode. The first electrode (110) has a band shape extending in one direction and includes a negative coating portion, which is an area where a negative active material layer is applied to a current collector of a metal foil (e.g., Cu foil), and a negative non-coating portion, which is an area where no active material is applied. The negative non-coating portion may be located at one end in the extension direction of the first electrode (110). The second electrode (120) has a band shape extending in one direction, spaced apart from the first electrode (110) with a separator (130) in between, and includes an anode coated portion, which is an area where an anode active material layer is applied to a current collector of a metal foil (e.g., Al foil), and an anode uncoated portion, which is an area where no active material is applied. The anode uncoated portion may be located at one end in the extension direction of the second electrode (120). The separator (130) extends in one direction between the first electrode (110) and the second electrode (120) to prevent a short circuit between the first electrode (110) and the second electrode (120). The fir