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EP-4742427-A1 - BATTERY AND BATTERY PACK INCLUDING THE SAME

EP4742427A1EP 4742427 A1EP4742427 A1EP 4742427A1EP-4742427-A1

Abstract

A battery and a battery pack including the same are disclosed. A battery includes a case, an electrode assembly accommodated in the case and including an electrode, a tab connected to the electrode and extending from the electrode assembly, a cap assembly facing the electrode assembly and including a terminal, and a current collector assembly between the electrode assembly and the cap assembly, and including a current collector plate joined to the tab, and a current collector coupled to the current collector plate and joined to the terminal.

Inventors

  • JUNG, YEON HO
  • LIM, HYUN YOUNG

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20251013

Claims (15)

  1. A battery comprising: a case (100); an electrode assembly (200) accommodated in the case (100) and comprising an electrode; a tab (301, 302) connected to the electrode and extending from the electrode assembly (200); a cap assembly (400) facing the electrode assembly (200) and comprising a terminal (420, 430); and a current collector assembly (500, 600, 700) between the electrode assembly (200) and the cap assembly (400), and comprising a current collector plate (720) joined to the tab, and a current collector (510, 610, 710) coupled to the current collector plate (520, 620, 720) and joined to the terminal (420, 430).
  2. The battery as claimed in claim 1, wherein the current collector (510, 610, 710) and the current collector plate (520, 620, 720) are assembled through a male-female fitting.
  3. The battery as claimed in claim 1 or 2, wherein the current collector (510, 610, 710) comprises a coupling protrusion (711) at an end portion of the current collector (510, 610, 710), and the current collector plate (520, 620, 720) comprises a coupling hole into which the coupling protrusion (711) is insertable and couplable.
  4. The battery as claimed in claim 3, wherein the current collector (510, 610, 710) comprises a current collector body (712) joined to the terminal (420, 430) through another end portion of the current collector (510, 610, 710), and a flange (713) between the current collector body (712) and the coupling protrusion (711) to be in direct physical contact with the current collector plate (520, 620, 720).
  5. The battery as claimed in claim 4, wherein the current collector body (712), the flange (713), and the coupling protrusion (711) are integrally formed.
  6. The battery as claimed in claim 4 or 5, wherein the current collector body (712) has a cylindrical shape with a first diameter and a first height, and the flange (713) has a cylindrical shape with a second diameter greater than the first diameter and a second height less than the first height.
  7. The battery as claimed in any one of claims 4 to 6, wherein the current collector body (712) is forged of a round bar material.
  8. The battery as claimed in any one of claims 1 to 7, wherein the current collector (510, 610, 710) and the current collector plate (520, 620, 720) are joined through butt welding.
  9. The battery as claimed in any one of claims 3 to 7, wherein the current collector plate (520, 620, 720) comprises a first sub-plate (521, 621, 721) in which the coupling hole is defined, and a second sub-plate (522, 523, 622, 623, 722, 723) extending from at least one side of the first sub-plate (521, 621, 721) and joined to the tab (301, 302).
  10. The battery as claimed in claim 9, wherein the tab (301) comprises an inner tab (310, 330) and an outer tab (320, 340), which extend from the electrode of a same polarity in the electrode assembly (200) and are spaced apart from each other, and the second sub-plate (522, 523, 622, 623, 722, 723) comprises an inner plate joined to the inner tab, and an outer plate joined to the outer tab, wherein the inner plate and the outer plate extend from opposite sides of the first sub-plate (521, 621, 721).
  11. The battery as claimed in claim 1 or 2, wherein the current collector plate (520, 620, 720) comprises a first sub-plate (721) comprising a first surface not in direct physical contact to the tab, and a second sub-plate (722, 723) extending from at least one side of the first sub-plate (721) and comprising a first surface joined to the tab; and wherein the current collector (510, 610, 710) is joined to the terminal (420, 430) through a coupling of the current collector to a second surface of the first sub-plate (721).
  12. The battery as claimed in claim 11, wherein the current collector (510, 610, 710) comprises a coupling protrusion (711) at an end portion of the current collector (510, 610, 710), and the first sub-plate (721) comprises a coupling hole into which the coupling protrusion (711) is insertable and couplable.
  13. The battery as claimed in claim 12, wherein the current collector (510, 610, 710) further comprises a current collector body (712) joined to the terminal (420, 430) through another end portion of the current collector (710), and a flange (713) between the current collector body (712) and the coupling protrusion (711) to be in direct physical contact with the second surface of the first sub-plate (721), and the current collector body (712), the flange (713), and the coupling protrusion (711) are integrally formed.
  14. The battery as claimed in claim 13, wherein the current collector body (712) has a cylindrical shape with a first diameter and a first height, and the flange (713) has a cylindrical shape with a second diameter greater than the first diameter and a second height less than the first height.
  15. A battery pack comprising: a housing (10); and a plurality of batteries in accordance with any one of claims 1 to 14 accommodated in the housing (10).

Description

Field Various aspects described herein relate to a battery. Various aspects described herein relate to a battery pack including one or more batteries. Description of the Related Art Unlike a primary battery that cannot be recharged, a secondary battery is a battery that can be recharged and discharged. A low-capacity secondary battery may be used for portable small-sized electronic devices, such as smartphones, feature phones, notebook computers, digital cameras, and camcorders, and a high-capacity secondary battery is widely used as a power source for driving a motor and a power storage battery in hybrid vehicles or electric vehicles. Such a secondary battery includes electrodes including a positive electrode and/or a negative electrode, an electrode assembly including the electrodes, a case that accommodates the electrode assembly, electrode terminals connected to the electrode assembly, and the like. As technology advances, secondary batteries with high capacity are required. Accordingly, a plurality of secondary batteries may be electrically connected and used. For example, the secondary battery may be applied to an electronic device in the form of a battery module including a plurality of secondary batteries, and/or a battery pack including a plurality of secondary battery modules. The secondary battery pack may also be configured by a plurality of secondary batteries. In this case, the electronic device is an electronic device that requires high power and/or high capacity and includes, for example, an electric vehicle or the like. A secondary battery typically includes an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately arranged. The electrode assembly is accommodated inside a case. A plurality of positive and negative electrodes (herein referred to as "electrodes") constituting the electrode assembly are electrically connected to the outside through positive and negative electrode tabs (herein referred to as "electrode tabs"), respectively. That is, a plurality of positive electrode tabs and a plurality of negative electrode tabs are electrically connected to a positive electrode terminal and a negative electrode terminal (herein referred to as "electrode terminals"), which are installed on a cap plate, respectively. To establish an electrical connection between the plurality of electrode tabs and the electrode terminal, a connection assembly including one or more connection members is disposed between the plurality of electrode tabs and the electrode terminal. The connection assembly can electrically connect the plurality of electrode tabs to the electrode terminal by joining a portion thereof to the plurality of electrode tabs and another portion thereof to the electrode terminal. In the connection assembly, the connection member joined to the plurality of electrode tabs and the connection member joined to the electrode terminal may be different parts of a single structure or separate structures that are coupled together. Such a connection assembly can be referred to as a current collector assembly that performs a function of gathering current supplied from the plurality of electrode tabs and transmitting the current to the electrode terminal. A shape and configuration of the current collector assembly can be implemented in various ways depending on a type, internal structure, specifications, and the like of a secondary battery. The above-described information disclosed in the background technology of the present disclosure is provided to improve understanding of the background of the present disclosure and, thus, may include information that does not form the related art. SUMMARY According to an aspect of embodiments, a battery including a current collector assembly with an improved structure and reduced manufacturing costs, and a battery pack including the same, are provided. However, aspects and problems to be solved by the present disclosure are not limited to the above-mentioned aspects and problems to be solved, and other aspects and problems to be solved not mentioned may be clearly understood by those skilled in the art from the following description. According to one or more embodiments, a current collector assembly for a battery is provided, the current collector assembly may be configured as described herein in relation to a battery and/or a battery pack. In some aspects, the current collector assembly includes a current collector plate and a current collector coupled (e.g., attached) to the current collector plate. In some aspects, the current collector and the current collector plate may be configured, in some aspects, as a male-female fitting to be assembled (e.g., to be directly coupled to one another). The current collector may include, in some aspects, a coupling protrusion at an end portion of the current collector, and the current collector plate may include a coupling hole into which the coupling protrusion is insertable and