KR101650557B1 - A jelly roll tap plate assembly, electrochemical device comprising the same, and manufacturing method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jelly roll electrode tap plate assembly, an electrochemical device including the same, and more particularly, to a jelly roll electrode tap assembly having a jelly roll type electrode assembly including a hollow, The present invention relates to a jelly roll electrode tap plate assembly having a novel structure capable of preventing battery deterioration due to heat generation inside a battery by connecting the hollow inside the roll to the outside of the battery, and an electrochemical device including the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jelly roll electrode tap plate assembly, an electrochemical device including the jelly roll electrode tap plate assembly, an electrochemical device including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jelly roll electrode tap plate assembly, an electrochemical device including the same, and more particularly, to a jelly roll electrode tap assembly having a jelly roll type electrode assembly including a hollow, To a jelly roll electrode tab plate assembly having a new structure for connecting a hollow inside a roll to the outside of a battery, an electrochemical device including the same, and a manufacturing method thereof.

As the demand for mobile devices, electric vehicles, energy storage devices and the like is increasing, the demand for secondary batteries as energy sources is rapidly increasing. Many research and development of lithium secondary batteries having high discharge voltage and energy density among such secondary batteries Has been commercialized and applied to various devices.

The secondary battery includes a cylindrical battery or a prismatic battery in which a jelly roll is embedded in a cylindrical or rectangular metal can according to the shape of the battery case and a pouch type battery in which a jelly roll or a laminated electrode assembly is embedded in a pouch- Batteries.

Also, the electrode assembly incorporated in the battery case is a chargeable dischargeable energy storage device composed of a positive electrode / separator / negative electrode. The electrode assembly includes a winding type electrode assembly Jelly roll), and a stacked electrode assembly in which a plurality of positive electrodes and negative electrodes of a predetermined size are sequentially stacked with a separator interposed therebetween. Among them, jelly roll, which is a winding type electrode assembly, has advantages of high productivity and high energy density per volume.

A typical cylindrical lithium secondary battery includes a cylindrical can, an electrode assembly accommodated in the can, and a cap assembly coupled to an upper portion of the can.

The electrode assembly has a structure in which a separator is interposed between the positive electrode and the negative electrode and is wound in a jelly roll shape. The positive electrode lead is attached to the upper cap assembly and the negative electrode lead is attached to the negative electrode. Respectively.

The upper cap assembly includes a top cap that forms a positive terminal, a PTC element that significantly increases the battery resistance when the temperature rises in the battery, a safety vent that cuts off the current when the pressure in the battery rises or discharges the gas, A gasket for electrically separating the safety vent from the cap plate, and a cap plate to which a positive terminal connected to the positive electrode is connected are sequentially stacked.

However, since the conventional secondary battery has a structure in which an electrode lead and an electrode tab electrically connected to the electrode assembly are separately mounted and taken out to the outside, when the expansion and contraction of the battery are repeated in the course of continuous charging and discharging, There is a disadvantage that a safety accident such as the above may occur.

In addition, the conventional cylindrical lithium secondary battery accumulates heat generated due to internal resistance when the battery is used, and in particular, a high temperature rise in the central portion of the battery accelerates deterioration of battery life. This leads to an increase in internal resistance during repeated charging and discharging, resulting in a decrease in output characteristics, and a disadvantage that a large difference in performance occurs between batteries when a plurality of batteries are connected and used.

(Patent Document 1) KR10-2009-0008060 A

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a jelly roll type battery having a hollow, And it is an object of the present invention to provide a hollow jelly roll electrode tab plate assembly of a new structure capable of minimizing heat accumulation generated inside a conventional cylindrical rechargeable battery and increasing productivity.

In order to solve the above problems, the present invention provides a hollow jelly roll having a separator, a first electrode sequentially and repeatedly stacked with the separator interposed therebetween, and a second electrode wound around the center of the jelly roll hollow part; And a first tab plate and a second tab plate electrically connected to both ends of the jelly roll; And a jelly roll electrode tab plate assembly.

In the jelly roll electrode tab plate assembly according to the present invention, the first tab plate may include: a first plate member; And a first tab plate hollow portion corresponding to the jelly roll hollow portion and formed at a center portion of the first plate member.

In the jelly roll electrode tap plate assembly according to the present invention, the first plate member may include: a first plate member groove that flows in from the first surface of the first plate member toward the second surface; And a first plate member protrusion protruding from a second surface of the first plate member in correspondence with the first plate member groove.

The jelly roll electrode tap plate assembly according to the present invention is characterized in that the first plate member includes a first electrolyte hole for injecting an electrolyte solution.

In the jelly roll electrode tap plate assembly according to the present invention, the second tab plate may include: a second plate member; And a second tab plate hollow portion corresponding to the jelly roll hollow portion and formed at a center portion of the second plate member.

In the jelly roll electrode tap plate assembly according to the present invention, the second plate member may include: a second plate member groove that is introduced from the first surface of the second plate member toward the second surface; And a second plate member protrusion protruding from the second surface of the second plate member in correspondence with the second plate member groove.

The jelly roll electrode tab plate assembly according to the present invention includes: a first electrode tab electrically connected to the first tab plate; And a second electrode tab electrically connected to the second tab plate.

In the jelly roll electrode tap plate assembly according to the present invention, the first electrode may include: a first current collector layer; A first active material layer applied to one surface or both surfaces of the first current collector layer; A first active material uncoated portion formed on one side of the first current collector layer and not coated with the first active material; And a control unit.

In the jelly roll electrode tap plate assembly according to the present invention, the second electrode may include a second current collector layer; A second active material layer coated on one side or both sides of the second current collector layer; And a second active material uncoated portion formed on one side of the second current collector layer and not coated with the second active material; And a control unit.

The jelly roll electrode tap plate assembly according to the present invention is characterized in that the first active material uncoated portion is formed on the first current collector layer and the second active material uncoated portion is formed on the lower portion of the second current collector layer .

In the jelly roll electrode tap plate assembly according to the present invention, the first active material uncoated portion extends to the upper surface of the separation membrane, and the second active material uncoated portion extends to the lower surface of the separation membrane.

The jelly roll electrode tap plate assembly according to the present invention is characterized in that the width of the second active material layer is wider than the width of the first active material layer. Preferably, the second active material layer includes a negative active material.

The present invention also provides an electrochemical device comprising a jelly roll electrode tab plate assembly according to the present invention. The electrochemical device according to the present invention is preferably a secondary battery or a capacitor.

The present invention also provides a method of manufacturing a jelly roll electrode tap plate assembly according to the present invention,

A first step of sequentially and repeatedly laminating the separator, the separator, and the first electrode, and a second step of forming a jelly roll by winding the second electrode around the center while forming a jelly roll hollow part;

A second step of preparing a first tab plate and a second tab plate;

The first tab plate hollow portion of the first tab plate is positioned correspondingly to the jelly roll hollow portion on the first surface of the jelly roll and the first plate member groove portion is electrically welded, A third step of electrically connecting the first active material to the non-coated portion of the roll; And

The second tab plate hollow portion of the second tab plate is positioned correspondingly to the jellyroll hollow portion on the second surface of the jelly roll and the second plate member groove portion of the second tab plate is electrically welded, A fourth step of causing the plate member projection to be electrically connected to the second active material uncoated portion of the jelly roll; The present invention also provides a method of manufacturing a jelly roll electrode tap plate assembly according to the present invention.

The method of manufacturing a jelly roll electrode tap plate assembly according to the present invention further includes electrically connecting the first tab and the second tab to the first tap plate and the second tap plate.

The present invention relates to a jelly roll type electrode assembly comprising a hollow jelly roll type hollow electrode assembly including a hollow portion penetrating the inside of the battery to effectively dissipate heat inside the battery, The present invention can provide a hollow jelly roll electrode tab plate assembly having a new structure that can be structurally connected to the outside of the battery and thereby increase productivity while minimizing heat accumulation occurring inside the cylindrical rechargeable battery.

FIG. 1 is a perspective view illustrating a hollow jelly roll electrode tab plate assembly according to an embodiment of the present invention,
Fig. 2 is an exploded perspective view of Fig. 1,
FIG. 3 is a schematic view showing a laminated structure of the jelly roll of FIG. 2,
Fig. 4 is a schematic view of Fig. 3 viewed from one direction,
Fig. 5 is a perspective view of the first tab plate in Fig. 1,
Fig. 6 is a side view of Fig. 5 taken in one direction,
Fig. 7 is a perspective view of the second tab plate in Fig. 1,
Fig. 8 is a side view of Fig. 7 viewed from one direction,
Fig. 9 is a perspective view in one direction showing that an electrode tab is attached to the first tab plate, and Fig.
10 is a perspective view in one direction showing that an electrode tab is attached to the second tab plate;

The components constituting the hollow jelly roll electrode tap plate assembly of the present invention may be used integrally or separately. In addition, some components may be omitted depending on the usage form.

A preferred embodiment of the hollow jelly roll electrode tab plate assembly 100 according to the present invention will be described with reference to Figs. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

1. Hollow type Jelly roll  electrode Tab plate  Assembly (100) Construction

Hereinafter, a hollow jelly roll electrode tap plate assembly 100 according to an embodiment of the present invention will be described with reference to the drawings.

A hollow jelly roll electrode tap plate assembly 100 according to an embodiment of the present invention includes a separator 110, a first electrode 120 that is sequentially and repeatedly stacked with the separator 110 therebetween, A hollow jelly roll 105 in which an electrode 130 is wound while forming a jelly roll hollow portion 106 at a central portion thereof and a tab plate hollow portion which is fused and electrically connected to both ends of the jelly roll 105, A first tap plate 141, and a second tap plate 142. [ The jelly roll electrode tap plate assembly 100 according to an exemplary embodiment of the present invention may further include an electrode tab 150 electrically connected to the first electrode 120 and the second electrode 130, respectively.

The hollow jelly roll electrode tap plate assembly 100 according to an embodiment of the present invention includes a first tab plate 141 having a new structure including a tab plate hollow portion structurally connecting the hollow jelly roll to the outside of the battery, And a second tab plate 142. [0033] As shown in FIG.

In the jelly roll electrode tap plate assembly according to an embodiment of the present invention, the first tab plate 141 includes a first plate member 141a and a second plate member 141b corresponding to the jelly roll hollow portion, And a first tab plate hollow portion 141e formed on the first tab plate. The first insertion hole 141e passes through the center of the first plate member 141a in correspondence with the jelly roll hollow portion and is then inserted into the jelly roll hollow portion through the first insertion hole 141e, (Not shown) may be inserted.

In the jelly roll electrode tap plate assembly according to an embodiment of the present invention, the first tab plate includes a first tab plate hollow portion corresponding to the jelly roll hollow portion, By forming the jelly roll electrode tab plate assembly to be connected to the roll hollow, the hollow inside the jelly roll can be connected to the outside of the cell.

The first plate member 141a includes: a first plate member groove 141b that flows in from the first surface of the first plate member toward the second surface; And a first plate member protrusion (141c) protruding from a second surface of the first plate member in correspondence with the first plate member groove, the first plate member protrusion being connected to an electrode assembly in the form of a jelly roll, It is preferable that the metal conductor is a metal conductor through which a current can flow so as to transmit the current generated by the chemical reaction to the electrode tab.

The first plate member groove 141b flows from the first surface of the first plate member 141a to the second surface direction through the center of the first plate member 141a as shown in Fig. More specifically, the first plate member groove 141b is formed so as to be recessed in a '+' shape. The first fusing member 141c protrudes from one surface of the first plate member 141a in correspondence with the first plate member groove 141b as shown in Fig.

Laser welding, spot welding, and ultrasonic welding are performed to electrically connect the first tab plate and the electrode assembly along the first plate member groove 141b so that the first plate member projecting portion 141c contacts the first And is electrically connected to the non-conductive portion. In the jelly roll electrode tab plate assembly according to an embodiment of the present invention, the first plate member 141a may include at least one first plate member groove 141b, And can be divided into a plurality of regions by the plate member grooves.

The first plate member 141a may include an electrolyte hole for injecting an electrolyte after the battery is assembled by housing the jelly roll electrode tab plate assembly according to the present invention in a case.

The electrolyte hole 141d is formed through at least one of a plurality of regions of the first plate member 141a partitioned by the first plate member groove 141b and serves as a passage through which the electrolyte can flow, In FIG. 5 of the present invention, the first electrolyte holes 141d are formed in three, but the number of the first electrolyte holes 141d can be appropriately changed as necessary.

The second tab plate 142 includes a second plate member 142a and a second tab plate hollow portion 142e formed at the center of the second plate member corresponding to the jelly roll hollow portion.

In the jelly roll electrode tab plate assembly according to an embodiment of the present invention, the second tab plate includes a second tab plate hollow portion 142e formed to correspond to the jelly roll hollow portion, like the first tab plate, And the second tab plate hollow portion is connected to the jelly roll hollow portion to form a jelly roll electrode tab plate assembly, so that the hollow inside the jelly roll can be connected to the outside of the battery.

The second plate member 142a includes a second plate member groove 142b and a second fusing member 142c and is connected to an electrode assembly in the form of a jelly roll so that the electrode assembly It is preferable that the metal conductor is a metal conductor through which electric current can flow so as to transmit a current to the electrode tab.

The second plate member groove 142b flows from the first surface of the second plate member 142a to the second surface direction through the center of the second plate member 142a as shown in Figure 7, And the second plate member groove 142b is formed so as to concave in a '+' shape.

The second plate member protrusion 142c protrudes from one surface of the second plate member 141a in correspondence with the second plate member groove 142b as shown in Fig.

Laser welding, spot welding, and ultrasonic welding are performed to electrically connect the second tab plate and the electrode assembly along the second plate member groove 142b so that the second plate member projecting portion 142c contacts the second And is electrically connected to the non-conductive portion.

The jelly roll electrode tab plate assembly according to an embodiment of the present invention includes: a first electrode tab electrically connected to the first tab plate; And a second electrode tab electrically connected to the second tab plate. The first electrode tab 151 is electrically connected to the first plate member 141a on which the electrolyte hole 141d is not formed and is made of a conductor so that current generated in the jellyroll tab plate assembly can flow to the outside . The second electrode tab 152 is attached to and electrically connected to the second plate member and is made of a conductor like the first electrode tab 151.

In the jelly roll electrode tap plate assembly according to an embodiment of the present invention, the jelly roll 105 includes a separator 110, a first electrode 120 sequentially and repeatedly stacked with the separator interposed therebetween, Two electrodes 130 are formed.

The separator 110 physically separates the contact between the anode and the cathode and performs the function of the battery by passing ions through pores having a size of several tens of nanometers. The separator 110 is formed to be wider than the first active material layer 121 and the second active material layer 122 as shown in FIG. 4 in order to effectively prevent contact between the positive electrode and the negative electrode.

The first electrode 120 includes a first current collector layer 121, a first active material layer 122 coated on one or both surfaces of the first current collector layer 121, And a first active material uncoated portion 123 formed on one side of the first current collector layer and not coated with the first active material.

The first active material layer 122 may be applied to one side or both sides of the first current collector layer 121.

The first active material layer 122 is applied to the first current collector layer 121 while forming the first active material uncoated portion 123 on one side of the first current collector layer 121. The first uncoated portion 123 not coated with the first active material layer 122 is formed to protrude to one side of the separator 110 as shown in FIG. 4, and the first tab plate 141, And is electrically fused to the non-coated portion 123. More specifically, the first non-coated portion may be fused with the first protruding member 141c of the first tab plate 141 described above and may be fused with the first plate member 141a itself in the process of fusing.

The second electrode 130 may include a second current collector layer 131, a second active material layer 132 coated on one or both surfaces of the second current collector layer, and a second current collector layer 132 formed on one side of the second current collector layer. And a second active material uncoated portion 133 to which the second active material is not applied.

As shown in FIG. 4, the second active material uncoated portion 133 is formed to protrude to the other side of the separator 110, and the second tab plate 142 described above is electrically connected to the second non-coated portion 133 do. More specifically, the second unprinted portion may be fused with the second protruding member 142c of the second tab plate 142 described above, and may be fused with the second plate member 142a itself in the process of fusion.

The first electrode 120 and the second electrode 130 are stacked on both sides of the separator 110 with the first active material uncoated portion 123 of the first current collector layer 121 interposed therebetween, And the second active material uncoated portion 133 of the second current collector layer 131 is formed on the lower part of the second current collector layer, desirable. The first active material uncoated portion 123 extends from one side of the separator 110 to the outer circumferential surface and the second active material uncoated portion 133 extends from one side of the separator 110 to the outer circumferential surface for safe and efficient connection of the active material non- Is preferably formed to extend from the other side of the separation membrane 110 to the outer peripheral surface.

Any one of the first active material layer 121 and the second active material layer 131 may be used as a negative electrode. In the present invention, the second electrode 130 corresponds to a negative electrode.

A method of manufacturing the jelly roll electrode tap plate assembly according to the present invention is as follows.

First, in a first step, a separator, a first electrode, and a second electrode, which are sequentially and repeatedly stacked with the separator interposed therebetween, are wound up while forming a jellyroll hollow portion at the center thereof to form a hollow jellyroll.

Thereafter, a first tab plate and a second tab plate are prepared, the first tab plate hollow portion of the first tab plate is positioned correspondingly to the jelly roll hollow portion on the first surface of the hollow jellyroll, The first plate member groove portion of the first tab plate is electrically welded to electrically connect the first plate member projecting portion to the first active material uncoated portion of the jelly roll.

Thereafter, the second tab plate hollow portion of the second tab plate is positioned correspondingly to the jellyroll hollow portion on the second surface of the jellyroll in the same manner, and the second plate member groove portion of the second tab plate is welded And the second plate member protrusion is electrically connected to the second active material uncoated portion of the jelly roll, thereby manufacturing the jellyroll electrode tab plate assembly.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

100: jelly roll assembly
105: Jelly roll
110: Membrane
120: first electrode
121: 1st collecting layer
122: first active material layer
123: first active material uncoated portion
130: second electrode
131: 2nd collecting layer
132: second active material layer
133: Second active material uncoiled portion
140:
141: first tab plate
141a: first plate member
141b: first plate member groove
141c: first fusing member
141d: first electrolyte hole
141e: first insertion hole
142: second tab plate
142a: second plate member
142b: second plate member groove
142c: second fusing member
142d: second insertion hole
150: electrode tab
151: first electrode tab
152: second electrode tab

Claims (17)

A jelly roll wound around the separator, a first electrode and a second electrode sequentially and repeatedly stacked with the separator interposed therebetween forming a jelly roll hollow in the center;
A first plate member electrically connected to the upper surface of the jellyroll roll, the first plate member having a central hollow portion corresponding to the jellyroll hollow portion;
A first plate member groove that flows in from the first surface of the first plate member toward the second surface;
A first plate member protrusion protruding from a second surface of the first plate member in correspondence with the first plate member groove;
A second plate member electrically connected to the lower surface of the jelly roll, wherein a second plate hollow corresponding to the jelly roll hollow is formed at the center;
A second plate member groove that is introduced from the first surface of the second plate member toward the second surface;
A second plate member protrusion protruding from a second surface of the second plate member in correspondence with the second plate member groove;
A first electrode tab attached to and electrically connected to the first plate member; And,
And a second electrode tab attached to and electrically connected to the second plate member,
Wherein the first electrode comprises a first current collector layer, a first active material layer coated on one or both surfaces of the first current collector layer, and a second current collector layer formed on one side of the first current collector layer, A first non-active material uncoated portion,
Wherein the second electrode comprises a second current collector layer and a second active material layer coated on one or both surfaces of the second current collector layer so as to be wider than the first active material layer; And a second active material uncoated portion in which the second active material is not applied,
Wherein the first active material uncoated portion is formed on the first current collector layer and extends from one side to the outer circumferential surface of the separator,
Wherein the second active material uncoated portion is formed at a lower portion of the first current collector layer and extends from the other side of the separator to an outer peripheral surface.
delete delete delete The method according to claim 1,
Wherein the first plate member comprises a first electrolyte hole for injecting an electrolyte solution. delete delete delete delete delete delete delete delete delete delete delete delete

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