CN-122029689-A - Power storage device

Abstract

The battery (10) is provided with an electrode body (14) formed by winding a strip-shaped positive electrode (11) and a strip-shaped negative electrode (12) through a strip-shaped separator (13), an outer can (16) which accommodates the electrode body (14) and comprises a cylindrical portion (30), and a sealing body (17) which seals the opening of the outer can (16). The negative electrode (12) has a first end and a second end in the axial direction of the electrode body (14). There are a first current collecting path electrically connecting the negative electrode (12) and the outer can (16) at a first end side, and a second current collecting path electrically connecting the negative electrode (12) and the outer can (16) at a second end side.

Inventors

• SAKAMOTO, SHINICHI
• GESHI SHINYA
• KOZUKI KIYOMI

Assignees

• 松下知识产权经营株式会社

Dates

Publication Date

20260512

Application Date

20241031

Priority Date

20231031

Claims (12)

1. 1. A power storage device is provided with: An electrode body formed by winding a band-shaped first electrode and a band-shaped second electrode through a band-shaped separator; An exterior can containing the electrode body and including a cylindrical portion, and A sealing body for sealing the opening of the outer can, Wherein the first electrode has a first end and a second end in an axial direction of the electrode body, The power storage device has a first power collecting path that electrically connects the first electrode and the outer can at the first end side, and a second power collecting path that electrically connects the first electrode and the outer can at the second end side.
2. 2. The power storage device according to claim 1, wherein, The outer peripheral surface of the cylindrical portion of the outer can has a groove portion recessed so that an inner peripheral portion of the cylindrical portion protrudes inward, The second end overlaps the groove portion in the axial direction.
3. 3. The power storage device according to claim 1, wherein, At the second end, the second current collecting path is formed in a region on the outer peripheral side.
4. 4. The power storage device according to claim 3, wherein, At the second end, the outer peripheral side region protrudes outward of the electrode body than the inner peripheral side region.
5. 5. The power storage device according to claim 1, wherein, The first electrode has a band-shaped first core and a first mixture layer formed on the first core.
6. 6. The power storage device according to claim 5, wherein, A first exposed portion in which the first mixture layer is not formed and the first core is exposed is formed at the first end, The first current collecting path is formed in the first exposed portion.
7. 7. The power storage device according to claim 5, wherein, A second exposed portion in which the first mixture layer is not formed and the first core is exposed is formed at the second end, The second current collecting path is formed in the second exposed portion.
8. 8. The power storage device according to claim 7, wherein, A resin layer is disposed on the second exposed portion.
9. 9. The power storage device according to claim 1 or 2, wherein, Including a dispersion portion in which a part of the second ends adjacent in the radial direction are directly engaged with or in contact with each other, or including a dispersion portion in which a part of the second ends adjacent in the radial direction are indirectly engaged with or in contact with each other via a connecting member having conductivity.
10. 10. The power storage device according to claim 1 or 2, wherein, And a collector plate electrically connected to the second end.
11. 11. The power storage device according to claim 1 or 2, wherein, The length of the end portion on the second end side in the axial direction becomes smaller stepwise or continuously as going from the outer peripheral side to the inner peripheral side of the first electrode.
12. 12. The power storage device according to claim 1, wherein, In the axial direction, the second electrode collects electricity from a side against the second end of the first electrode, The second electrode collects current on the inner peripheral side of the second current collection path.

Description

Power storage device Technical Field The present disclosure relates to an electric storage device, for example, to a battery and a capacitor. Background Conventionally, there is a cylindrical battery described in patent document 1 as a power storage device. The cylindrical battery includes an electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a bottomed tubular outer can accommodating the electrode body, and a sealing body closing an opening of the outer can. The outer can has a cylindrical portion and a bottom portion, the cylindrical portion including an annular groove portion and an annular shoulder portion. The groove portion is formed by recessing a part of the cylindrical portion radially inward. The shoulder portion extends radially inward at an upper end of the cylindrical portion. The sealing body is held between the groove and the shoulder via the gasket, and is thereby fixed to the outer can. The end of the electrode body on the sealing body side in the axial direction is constituted by a positive electrode core exposed portion, and the end of the electrode body on the bottom plate portion side of the outer can in the axial direction is constituted by a negative electrode core exposed portion. The positive electrode core exposed portion is bound from the outer periphery side to the inner periphery side and welded to an upper current collecting plate, and the upper current collecting plate is electrically connected to the sealing body. The negative electrode substrate exposed portion is bound from the outer periphery side to the inner periphery side and welded to a lower current collecting plate, and the lower current collecting plate is welded to a bottom plate portion of the outer can. The positive electrode terminal is constituted by a terminal cap of the sealing body electrically connected to the positive electrode substrate exposed portion via the upper current collecting plate, and the negative electrode terminal is constituted by an outer can electrically connected to the negative electrode substrate exposed portion via the lower current collecting plate. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2018-056091 Disclosure of Invention In recent years, in the field of power storage devices including the cylindrical batteries, it has been desired to improve the performance of the power storage devices in addition to the desire to improve the capacity and output or use in environments with more stringent conditions. The power storage device includes an electrode body formed by winding a first electrode in a band shape and a second electrode in a band shape through a band-shaped separator, an outer can accommodating the electrode body and including a cylindrical portion, and a sealing body closing an opening of the outer can, wherein the first electrode has a first end and a second end in an axial direction of the electrode body, the power storage device includes a first current collecting path electrically connecting the first electrode and the outer can at the first end side, and a second current collecting path electrically connecting the first electrode and the outer can at the second end side. According to the power storage device of the present disclosure, performance can be improved. Drawings Fig. 1 is a cross-sectional view in the axial direction of a cylindrical battery according to a first embodiment of an electric storage device of the present disclosure. Fig. 2 is a schematic plan view of the negative electrode when the negative electrode is developed in a band shape. Fig. 3 is a diagram illustrating an example of a method of bonding the groove portion, the second upper current collector plate, and the upper negative electrode substrate exposed portion. Fig. 4 (a) is a diagram illustrating a structure of a second upper collector plate, fig. 4 (b) is a diagram illustrating a structure of a second upper collector plate according to a first modification, and fig. 4 (c) is a diagram illustrating a structure of a second upper collector plate according to a second modification. Fig. 5 is a sectional view corresponding to fig. 1 of a cylindrical battery according to a first modification. Fig. 6 is a schematic plan view of the negative electrode according to the second modification corresponding to fig. 2. Fig. 7 is a schematic plan view of the negative electrode according to the third modification example, corresponding to fig. 2. Fig. 8 is a schematic plan view of the negative electrode according to the fourth modification corresponding to fig. 2. Fig. 9 is a schematic plan view of the negative electrode of the fifth modification corresponding to fig. 2. Fig. 10 is a sectional view corresponding to fig. 1 of a cylindrical battery of the second embodiment. Fig. 11 is a schematic plan view of the cylindrical battery of the second embodiment when the positive electrode