Cylindrical lithium secondary battery
First Claim
1. A cylindrical lithium secondary battery comprising:
- an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, is wound in a spiral shape, and has a central space at the center of winding;
a core member which is inserted into the central space of the electrode assembly;
a case having a space for containing the electrode assembly; and
a cap assembly which is connected to an open end of the case so as to seal the case, wherein the core member is formed in a tube shape having a gap along a longitudinal direction, which divides the core member into a body portion and left and right lateral end portions, wherein an imaginary arc line extending from an outer circumferential surface of the body portion of the core member defines an imaginary circumference, and wherein the left and right lateral end portions are located inside the imaginary circumference and comprise a pair of first bending portions, inwardly bending and symmetrically disposed with respect to the gap, and a pair of second bending portions bending in a rotation direction that is opposite to the inwardly bending rotational directions of the first bending portions.
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Accused Products
Abstract
A cylindrical lithium secondary battery includes an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, is wound in a spiral shape, and has a central space at the center of winding; a core member which is inserted into the central space of the electrode assembly; a case having a space for containing the electrode assembly; and a cap assembly which is connected to an upper portion of the case so as to seal the case. The core member is formed in a tube shape having a gap along a longitudinal direction, which divides the core member into a body portion and left and right lateral end portions, wherein an imaginary arc line extending from an outer circumferential surface of the body portion of the core member defines an imaginary circumference, and wherein the left and right lateral end portions are located inside the imaginary circumference and comprise a pair of first bending portions, inwardly bending and symmetrically disposed with respect to the gap, and a pair of second bending portions bending in a rotation direction that is opposite to the inwardly bending rotational directions of the first bending portions.
95 Citations
27 Claims
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1. A cylindrical lithium secondary battery comprising:
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an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, is wound in a spiral shape, and has a central space at the center of winding;
a core member which is inserted into the central space of the electrode assembly;
a case having a space for containing the electrode assembly; and
a cap assembly which is connected to an open end of the case so as to seal the case, wherein the core member is formed in a tube shape having a gap along a longitudinal direction, which divides the core member into a body portion and left and right lateral end portions, wherein an imaginary arc line extending from an outer circumferential surface of the body portion of the core member defines an imaginary circumference, and wherein the left and right lateral end portions are located inside the imaginary circumference and comprise a pair of first bending portions, inwardly bending and symmetrically disposed with respect to the gap, and a pair of second bending portions bending in a rotation direction that is opposite to the inwardly bending rotational directions of the first bending portions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cylindrical lithium secondary battery comprising:
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an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, is wound in a spiral shape, and has a central space at the center of winding;
a core member which is inserted into the central space of the electrode assembly;
a case having a space for containing the electrode assembly; and
a cap assembly which is connected to an open portion of the case so as to seal the case, wherein the core member is formed in a tube shape having a slit opening along a longitudinal direction, which divides the core member into a body portion and left and right lateral end portions, wherein an imaginary arc line extending from the body portion of the core member defines an imaginary circumference, and wherein the left and right lateral end portions are located inside the imaginary circumference and comprise a pair of first bending portions, inwardly bending a symmetrically disposed with respect to the slit opening, and a pair of second bending portions bending in a rotation direction that is the same as the rotational direction of the first bending portions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A cylindrical lithium secondary battery comprising:
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an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, and has a central space at the center of winding;
a core member which is formed in a tube shape first and second end portions and having a cut-groove along a longitudinal direction, and that includes a protrusion that protrudes from the second tube end portion of the core member, and is bonded at the central space of the electrode assembly;
a case which has a space for containing the electrode assembly and which comprises an open portion through which the electrode assembly is inserted; and
a cap assembly which is connected to the open portion of the case so as to seal the case. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A cylindrical lithium secondary battery comprising:
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an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, and has a central space at the center of winding;
a core member which is formed in a tube shape having a cut-groove along a longitudinal direction, and includes at least one notch formed in a longitudinal direction at an inner lateral surface of the tube shape;
a case which has a space for containing the electrode assembly and including an open portion; and
a cap assembly which is connected to an open portion of the case so as to seal the case. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A cylindrical lithium secondary battery comprising:
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an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, and has a specific space at the center of winding;
a core member which is formed in a tube shape having a first tube end portion, a second tube end portion and middle portion and having a slot in the middle portion along a longitudinal direction, wherein the slot does not extend into the first tube end portion or the second tube end portion;
a case which has a space for containing the electrode assembly and that comprises an open end portion; and
a cap assembly which is connected to the open end portion of the case so as to seal the case.
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Specification