CN-122029654-A - Battery, battery pack, and vehicle including battery pack

Abstract

The battery according to the present invention includes a battery case, an electrode assembly disposed within the battery case and including a first electrode having a first polarity, a second electrode having a polarity opposite to the first polarity, and a separator interposed between the first electrode and the second electrode, and a current collecting plate disposed within the battery case and electrically coupled to the battery case and the second electrode, wherein the current collecting plate includes an electrode coupling portion electrically coupled to the second electrode, a peripheral portion electrically coupled to the battery case, and at least one bridge member extending between and connecting the electrode coupling portion and the peripheral portion, the at least one bridge member including a regulating portion deformed in response to an applied force.

Inventors

• GAO GUANGXUN
• HUANG DONGXING
• JIN DUJUN
• JIN JIANGUO
• CUI XIANYOU

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260512

Application Date

20250702

Priority Date

20240705

Claims (20)

1. 1. A battery, the battery comprising: A cell housing; an electrode assembly positioned within the cell housing, the electrode assembly including a first electrode having a first polarity, a second electrode having a second polarity opposite the first polarity, and a separator interposed between the first electrode and the second electrode; a current collector plate positioned within the cell housing and electrically coupled to both the cell housing and the second electrode, the current collector plate comprising: an electrode coupling portion electrically coupled to the second electrode; A peripheral portion electrically coupled to the cell housing, and At least one of the bridge members is configured to be coupled to a first bridge member, the at least one bridge member extends between and connects the electrode coupling portion and the peripheral portion, Wherein the at least one bridge includes an adjustable portion configured to deform in response to an applied force.
2. 2. The battery of claim 1, wherein the polarity of the first electrode is positive and the second polarity of the electrode is negative.
3. 3. The battery of claim 1, wherein the cell housing has a cylindrical shape, and wherein the peripheral portion of the current collector plate has an annular shape.
4. 4. The battery of claim 3, wherein a radially outer peripheral surface of the peripheral portion abuts an inner peripheral surface of the cell housing.
5. 5. The battery according to claim 4, wherein the radially outer peripheral surface of the peripheral portion is welded to the inner peripheral surface of the cell case.
6. 6. The battery of claim 3, wherein the electrode coupling portion is positioned radially inward relative to the peripheral portion.
7. 7. The battery of claim 1, wherein the at least one bridge of the current collector plate is a plurality of bridges including a first bridge and a second bridge, each of the first bridge and the second bridge having a respective adjustable portion.
8. 8. The battery of claim 7, wherein the first bridge and the second bridge are positioned opposite each other across a center of the current collector plate.
9. 9. The battery of claim 1, wherein the adjustable portion of the at least one bridge is configured to deform in response to an applied force so as to change a length of the at least one bridge.
10. 10. The battery of claim 1, wherein the bridge extends linearly along a radial direction of the current collector plate.
11. 11. The battery of claim 10, wherein the adjustable portion has a curved shape that is offset from the radial direction of the at least one bridge.
12. 12. The battery of claim 1, wherein the adjustable portion is configured to collapse in response to an applied force.
13. 13. The battery of claim 12, wherein the adjustable portion includes a cutout for facilitating a folding operation of the adjustable portion.
14. 14. The battery according to claim 1, wherein the peripheral portion of the current collecting plate includes a rigidity reinforcing structure for reinforcing rigidity of the peripheral portion.
15. 15. The battery of claim 14, wherein the rigidity-enhancing structure extends transversely relative to a radial plane in which the current collector plate is oriented.
16. 16. The battery of claim 15, wherein the rigidity-enhancing structure comprises at least one annular wall protruding laterally relative to the radial plane.
17. 17. The battery of claim 15, wherein the peripheral portion has a planar surface oriented parallel to the radial plane, and wherein the rigidity-enhancing structure defines a deviation from the planar surface along a vertical direction orthogonal to the radial plane.
18. 18. The battery of claim 1, wherein the electrode assembly has a jellyroll structure including the first electrode, the second electrode, and the separator interposed between the first electrode and the second electrode, all wound around a central axis extending transversely with respect to a radial plane in which the current collector plate is oriented.
19. 19. A battery pack comprising a plurality of cells according to claim 1.
20. 20. A vehicle comprising the battery pack according to claim 19 as a power source of the vehicle.

Description

Battery, battery pack, and vehicle including battery pack Technical Field The present disclosure relates to a battery, a battery pack, and a vehicle including the battery pack. More specifically, the battery may be a rechargeable secondary battery such as a lithium ion secondary battery. The present application claims priority from korean patent application No.10-2024-0089202 filed on 7/5 of 2024, the entire disclosure of which is incorporated herein by reference. Background In recent years, as the demand for portable electronic products such as laptop computers, video cameras and mobile phones has rapidly increased and electric vehicles, energy storage batteries, robots and satellites have begun to walk into the orbit, research into high-performance secondary batteries that can be repeatedly charged and discharged has been actively conducted. The secondary batteries commercialized at present include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium secondary batteries, and the like. Among them, lithium secondary batteries have been attracting attention because they have the following advantages, in comparison with nickel-based secondary batteries, lithium secondary batteries are free to charge and discharge due to little memory effect, very low self-discharge rate, and high energy density. These lithium ion secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. In addition, the lithium ion secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with a positive electrode active material and a negative electrode active material, respectively, are provided with a separator interposed therebetween, and an external material that accommodates the electrode assembly therein and seals the electrode assembly with an electrolyte. Meanwhile, lithium ion secondary batteries can be classified into pouch-type secondary batteries, in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, and can-type secondary batteries, in which an electrode assembly is embedded in a metal can, according to the shape of a battery case. In addition, can-type secondary batteries may be classified into cylindrical batteries and prismatic batteries according to the form of a metal can. The lithium ion secondary battery may be used as a battery module or a battery pack in which a plurality of battery cells are assembled into a compact structure by overlapping or stacking them in a state in which they are mounted on themselves or on a cartridge, and then electrically connected to each other to provide high voltage and high current. Fig. 1a to 1b are sequential perspective views showing steps of inserting an electrode assembly having a current collecting plate coupled thereto into a cell case in a conventional battery, and fig. 1c is a partial top plan view of the current collecting plate in the conventional battery. Referring to fig. 1a through 1c, a conventional cylindrical battery 10 may include a negative current collector plate 16. The negative current collector plate 16 may be electrically coupled to the negative electrode of the electrode assembly 12 and the metal can (cell case) 14 such that the can 14 has the same potential as the negative electrode and may serve as a negative terminal of the battery 10. The cylindrical battery 10 including the anode current collector plate 16 may be manufactured through a process of coupling the anode current collector plate 16 to the electrode assembly 12 and inserting the electrode assembly 12 to which the anode current collector plate 16 is coupled into the metal can 14. It may be important that the anode current collector plate 16 and the electrode assembly 12 are concentrically coupled to each other such that they share a common central axis. If the center of the anode current collecting plate 16 and the center of the electrode assembly 12 are significantly eccentric with respect to each other, the anode current collecting plate 16 may interfere with or be caught in the metal can 14 when the electrode assembly 12 is inserted into the metal can 14, thereby making the insertion difficult. Even if the electrode assembly 12 having the eccentric anode current collecting plate 16 is forcibly inserted into the metal can 14, the anode current collecting plate 16, the electrode assembly 12, and/or the metal can 14 may be accidentally deformed. Further, if the outer diameter of the anode current collector plate 16 and the inner wall of the metal can 14 are not substantially in abutting contact with each other, it may be difficult or impossible to weld the anode current collector plate 16 and the metal can 14. However, it is very difficult to precisely align the respective centers of the anode current collecting plate 16 and the electrode assembly 12 in this process. Dis