One]Cross Citation with Related Applications
[2]This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0142204 dated November 08, 2019, and all contents disclosed in the documents of the Korean patent application are incorporated as a part of this specification.
[3]
technical field
[4]
The present invention relates to an electrode assembly having improved heat dissipation and a secondary battery including the same.
background
[5]
In general, a secondary battery refers to a battery capable of charging and discharging unlike a primary battery that cannot be charged, and such secondary batteries are widely used in high-tech electronic devices such as phones, notebook computers, and camcorders.
[6]
The secondary battery is classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch-type secondary battery in which an electrode assembly is embedded in a pouch, and the can-type secondary battery includes an electrode assembly, a can containing the electrode assembly, and a can. and a cap assembly mounted in the opening of the electrode assembly, wherein the electrode assembly has a structure in which electrodes and separators are alternately stacked. The electrode includes a first electrode and a second electrode, the first electrode is coupled to the can through a first electrode tab, and the second electrode is coupled to the cap assembly through a second electrode tab.
[7]
However, in the secondary battery, when a short occurs while the first electrode and the second electrode are in contact, the temperature of the electrode assembly rises. There was a problem that it exploded or ignited.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[8]
The present invention was invented to solve the above problems, and the present invention is an electrode assembly capable of rapidly dissipating heat generated in the electrode assembly to the outside, thereby preventing the electrode assembly from explosion or ignition, and the same An object of the present invention is to provide a secondary battery comprising
means of solving the problem
[9]
In the electrode assembly of the present invention for achieving the above object, a first electrode and a second electrode are wound in a jelly-roll form with a separator interposed therebetween, and the first electrode is provided at the winding start point and does not have a first electrode active material. A winding start portion, a first winding end portion provided at the winding end point and without a first electrode active material, and a first coating portion provided between the first winding start portion and the first winding end portion and coated with a first electrode active material a first electrode to; A second winding start portion provided at the winding start point and without a second electrode active material, a second winding end portion provided at the winding end point and without a second electrode active material, and between the second winding start portion and the second winding end portion and a second electrode including a second coating part coated with a second electrode active material; an electrode tab portion including a first electrode tab provided at a first winding end portion of the first electrode and a second electrode tab provided at a winding start portion of the second electrode; and a first protective member attached to a surface of a second winding end portion of the second electrode facing the first electrode tab.
[10]
The first protective member may be made of a material having heat dissipation.
[11]
The first protective member may have an area greater than an area of ​​the first electrode tab positioned within the first winding end portion.
[12]
and a second protection member attached to a surface of the first winding start portion of the first electrode facing the second electrode tab.
[13]
The second protective member may be made of a material having heat dissipation.
[14]
The second protective member may have an area greater than an area of ​​the second electrode tab positioned within the second winding start portion.
[15]
The first protective member may have a larger area than the second protective member.
[16]
The first winding start portion and the first winding end portion may have different lengths when viewed in the longitudinal direction of the first electrode, and the first winding end portion may have a greater length than the first winding start portion.
[17]
The second winding start portion and the second winding end portion may have different lengths when viewed in the longitudinal direction of the second electrode, and the second winding end portion may have a greater length than the second winding start portion.
[18]
A first protective tape may be attached to the first electrode tab, and the first protective tape may be made of a material having heat dissipation properties.
[19]
A second protective tape may be attached to the second electrode tab, and the second protective tape may be made of a material having heat dissipation properties.
[20]
The first electrode may be an anode, and the second electrode may be a cathode.
[21]
The first protective member is attached to one surface of the second winding end of the second electrode facing the first electrode tab, and an auxiliary member is provided on the other surface of the second winding end of the second electrode corresponding to the first protective member. It is attached, and the first protective member and the auxiliary member may be connected by a connecting portion penetrating the second winding end portion.
[22]
The first protective member, the auxiliary member, and the connecting member may be integrally formed and made of a heat-dissipating material.
[23]
On the other hand, the secondary battery of the present invention includes an electrode assembly in which the first electrode and the second electrode are wound in a jelly-roll form with a separator interposed therebetween; a case accommodating the electrode assembly, wherein the electrode assembly is provided at a winding start point and has no first electrode active material; and a first electrode provided between the first winding start part and the first winding end part and comprising a first coating part coated with a first electrode active material; A second winding start portion provided at the winding start point and without a second electrode active material, a second winding end portion provided at the winding end point and without a second electrode active material, and between the second winding start portion and the second winding end portion and a second electrode including a second coating part coated with a second electrode active material; an electrode tab portion including a first electrode tab provided at a first winding end portion of the first electrode and a second electrode tab provided at a winding start portion of the second electrode; and a first protective member attached to a surface of a second winding end portion of the second electrode facing the first electrode tab.
Effects of the Invention
[24]
The electrode assembly of the present invention is characterized in that it includes a first protective member attached to the surface of the second winding end of the second electrode facing the first electrode tab. Due to such a feature, it is possible to prevent the first electrode tab and the second electrode from coming into contact with each other, thereby preventing the occurrence of a short circuit in advance, and as a result, stability can be improved.
[25]
In particular, in the electrode assembly of the present invention, the first protective member is characterized in that it is provided with a material having heat dissipation. Due to these characteristics, the heat generated in the electrode assembly can be quickly discharged to the outside, and accordingly, the temperature rise of the electrode assembly can be suppressed, thereby preventing the secondary battery from being exploded or ignited. In particular, the first protective member may effectively dissipate heat generated between the first electrode tab and the second electrode.
[26]
In addition, in the electrode assembly of the present invention, the first protective member has a larger area than that of the first electrode tab located in the first winding end of the first electrode. Due to such a characteristic, the heat dissipation property of the electrode assembly can be greatly improved, and in particular, not only the first electrode tab but also the heat generated at the first winding end of the first electrode to which the first electrode tab is attached can be rapidly discharged to the outside.
[27]
In addition, the electrode assembly of the present invention is characterized in that the second protective member is further attached to the surface of the first winding start part of the first electrode facing the second electrode tab. Due to such a feature, it is possible to prevent the second electrode tab from contacting the first electrode, and it is possible to suppress the temperature rise of the electrode assembly, thereby preventing the electrode assembly from being exploded or ignited.
[28]
In particular, in the electrode assembly of the present invention, the second protective member is characterized in that it is provided with a material having the same heat dissipation property as the first protective member. Due to such a feature, heat generated in the electrode assembly can be quickly discharged to the outside, and accordingly, the temperature rise of the electrode assembly can be suppressed, and thus the electrode assembly can be prevented from being exploded or ignited. In particular, the second protective member may effectively dissipate heat generated between the second electrode tab and the first electrode.
[29]
In addition, in the electrode assembly of the present invention, the second electrode includes a second winding start portion and the second winding end portion, wherein the second winding end portion has a greater length than the second winding start portion. This feature minimizes the length of the second winding start part and increases the length of the second winding end part because the heat generated inside the electrode assembly can be effectively dissipated by the first and second protective members. Adhesion and heat dissipation can be improved.
[30]
In addition, in the electrode assembly of the present invention, the first and second protective tapes having heat dissipation properties are attached to the first and second electrode tabs, and due to such a feature, heat generated in the first and second electrode tabs is removed. It is possible to effectively dissipate heat, thereby greatly suppressing the temperature rise of the electrode assembly.
Brief description of the drawing
[31]
1 is an exploded perspective view showing a state before winding of an electrode assembly according to a first embodiment of the present invention;
[32]
Fig. 2 is a plan view of Fig. 1;
[33]
3 is a cross-sectional view taken along line AA shown in FIG.
[34]
4 is a cross-sectional view taken along line BB shown in FIG.
[35]
5 is a front view showing a first protective tape of the electrode assembly included in the secondary battery according to the first embodiment of the present invention.
[36]
6 is a front view showing a second protective tape of the electrode assembly included in the secondary battery according to the first embodiment of the present invention.
[37]
7 is a cross-sectional view illustrating a secondary battery according to a second embodiment of the present invention.
[38]
8 is a cross-sectional view showing an electrode assembly according to a third embodiment of the present invention.
Best mode for carrying out the invention
[39]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.
[40]
[Electrode assembly according to the first embodiment of the present invention]
[41]
As shown in FIGS. 1 to 6 , the electrode assembly 100 according to the first embodiment of the present invention has a structure in which the first electrode and the second electrode are wound in a jelly-roll form with a separator interposed therebetween. have
[42]
For example, in the electrode assembly 100 according to the first embodiment of the present invention, the first electrode 110 , the separator 120 , the second electrode 130 , and the separator 140 are in the front-back direction when viewed in FIG. 1 . It has a structure in which it is sequentially stacked along, and is wound in a jelly-roll form from the winding start point (left end when viewed in FIG. 1) to the winding end point (right end when viewed in FIG. 1).
[43]
first electrode
[44]
The first electrode 110 is provided at a winding start point and has a first winding start portion 111 without a first electrode active material, a first winding end portion 112 provided at a winding end point without a first electrode active material, and the It is provided between the first winding start portion 111 and the first winding end portion 112 and includes a first coating portion 113 coated with a first electrode active material.
[45]
second electrode
[46]
The second electrode 130 is provided at a winding start point and has a second winding start portion 131 without a second electrode active material, a second winding end portion 132 provided at a winding end point and without a second electrode active material, and the second electrode 130 2 It is provided between the winding start part 131 and the second winding end part 132 and includes a second coating part 133 coated with a second electrode active material.
[47]
Meanwhile, the electrode assembly 100 according to the first embodiment of the present invention includes an electrode tab portion 150 .
[48]
electrode tab
[49]
The electrode tab portion 150 is provided at the first electrode tab 151 provided at the first winding end portion 112 of the first electrode 110 and the winding start portion 131 of the second electrode 130 . and a second electrode tab 152 which is
[50]
Meanwhile, the first electrode 110 is an anode, and the second electrode 130 is a cathode. In addition, the first electrode tab 151 is a positive electrode tab, and the second electrode tab 152 is a negative electrode tab.
[51]
Here, in the electrode assembly 100 according to the first embodiment of the present invention, the positive electrode tab, which is the first electrode tab 151 , is provided at the first winding end 112 of the first electrode 110 , thereby generating a short circuit in the positive electrode tab. Heat can be quickly discharged out of the electrode assembly 100, and accordingly, it is possible to prevent the electrode assembly 100 from being exploded or ignited in advance. That is, when yangt is generated, more heat is generated in the positive electrode tab than in the negative electrode tab, and accordingly, as the positive electrode tab is provided at the first winding end 112 of the first electrode 110 located outside the electrode assembly, the positive electrode tab is generated. Heat can be dissipated quickly to the outside.
[52]
first protective member
[53]
On the other hand, in the electrode assembly 100 according to the first embodiment of the present invention, the first protection attached to the surface of the second winding end 132 of the second electrode 130 facing the first electrode tab 151 . It includes a member 160, and the first protective member 160 can prevent the second winding end 132 of the second electrode 130 from being deformed by the first electrode tab 151, Accordingly, contact between the first electrode tab 151 and the second electrode 130 can be prevented, and as a result, stability can be improved.
[54]
Here, the rim of the first protective member 160 further includes an extension extending outside the rim of the second winding end portion 132 , and the extension portion is bent along the rim of the first protective member 160 , and then the first protective member 160 is attached to the other side of the second winding end 132 to which it is not attached. Accordingly, the strength of the edge of the second winding end portion 132 may be increased.
[55]
On the other hand, it may be provided with a material having heat dissipation of the first protective member 160 . That is, the electrode assembly 100 generates high heat during charging and discharging or when a short circuit occurs, and the electrode assembly 100 may explode or ignite due to the high heat. In order to prevent this, the electrode assembly 100 according to the first embodiment of the present invention includes the first protective member 160 as a material having heat dissipation, and thus heat generated on the outside of the electrode assembly 100 is dissipated in the first It can be rapidly discharged to the outside through the protective member 160, and as a result, the temperature rise of the electrode assembly 100 can be suppressed, so that the electrode assembly 100 can be prevented from being exploded or ignited.
[56]
In particular, the first protective member 160 is attached to the entire surface of the second winding end portion 132 , and accordingly, heat dissipation from the upper portion to the lower portion of the outer surface of the electrode assembly 100 may be improved.
[57]
In addition, the first protective member 160 has an area larger than that of the first electrode tab 151 located in the first winding end portion 112 , and thus the second protection member 160 is formed by the first electrode tab 151 . Damage to the second winding end 132 of the electrode 130 can be prevented, and heat generated in the first electrode tab 151 can be effectively absorbed through the first protective member 160 and then released to the outside. have.
[58]
On the other hand, the surface of the first protective member 160 has a concave-convex shape, so that the first protective member 160 can be easily bent, and heat can be effectively dissipated through the irregularities.
[59]
second protection member
[60]
On the other hand, in the electrode assembly 100 according to the first embodiment of the present invention, the second electrode assembly 100 is attached to the surface of the first winding start part 111 of the first electrode 110 facing the second electrode tab 152 . a protective member 170 , wherein the second protective member 170 supports the first electrode tab 151 , so that the second winding end portion of the second electrode 130 is formed by the second electrode tab 151 . It is possible to prevent the 132 from being deformed, and accordingly, it is possible to prevent the first electrode tab 151 from contacting the second electrode 130 , and as a result, stability can be improved.
[61]
Meanwhile, the second protection member 170 may be made of a material having heat dissipation properties. That is, the electrode assembly 100 generates high heat during charging and discharging or when a short circuit occurs, and the electrode assembly 100 may explode or ignite due to the high heat. In particular, the second protective member 170 can effectively dissipate the heat generated in the core portion of the electrode assembly 100 , thereby greatly suppressing the temperature rise of the electrode assembly 100 .
[62]
Here, the second protective member 170 has an area larger than that of the second electrode tab 152 , and accordingly, it is possible to prevent deformation of the first winding start part 111 by the second electrode tab 152 . .
[63]
On the other hand, the second protection member 170 has a concave-convex shape, so that the second protection member 170 can be easily bent, and heat can be effectively dissipated through the concavities and convexities. That is, in the second protection member 170 , a plurality of grooves are formed in the longitudinal direction of the first electrode 110 , and the grooves are formed long in the width direction of the first electrode 110 . Accordingly, the second protection member 170 can be easily bent through the groove, and as a result, the first winding start part 111 of the first electrode 110 to which the second protection member 170 is attached is easy. can be strongly recommended.
[64]
On the other hand, the first protective member 160 has a larger area than the second protective member 170, thereby increasing the area of ​​the first protective member 160 surrounding the outside of the electrode assembly 100, and , As a result, the heat generated in the electrode assembly 100 can be more easily discharged. On the other hand, the second protection member 170 has a smaller area than the first protection member 160 , and thus the volume increase of the core portion of the electrode assembly 100 can be greatly reduced.
[65]
On the other hand, the first winding start portion 111 and the first winding end portion 112 have different lengths when viewed in the longitudinal direction of the first electrode 110, the first winding end portion 112 is It has a greater length than the first winding start portion (111). That is, the size is minimized because the electrode tab is not attached to the first winding start portion 111 , and the size is maximized because the electrode tab is attached to the first winding end portion 112 . Accordingly, the electrode tab can be stably attached.
[66]
The second winding start portion 131 and the second winding end portion 132 have different lengths when viewed in the longitudinal direction of the second electrode 130 , and the second winding end portion 132 is the first winding end portion 132 . 2 has a greater length than the winding start portion (131). Here, the second winding end portion 132 has a size corresponding to the first winding end portion 112 . Accordingly, the second winding end portion 132 can effectively cover the first winding end portion 112 , and in particular, the area of ​​the first protective member 160 can be greatly increased, and as a result, heat dissipation of the electrode assembly 100 . can increase
[67]
first protective tape
[68]
Meanwhile, in the electrode assembly 100 according to the first embodiment of the present invention, a first protective tape 180 is attached to the first electrode tab 151 , and the first protective tape 180 is the first electrode tab. It is possible to remove the step difference between the 151 and the first winding end 112 , and it is possible to prevent the separator 120 from being damaged by the first electrode tab 151 .
[69]
In addition, the first protective tape 180 is provided with a material having heat dissipation, and accordingly, the heat generated in the core portion of the electrode assembly 100 can be rapidly discharged to the outside.
[70]
Meanwhile, the first protective tape 180 and the first protective member 160 are provided with the same size, thickness, and material, and accordingly, the electrode is deformed by the first protective tape 180 and the first protective member 160 . can be prevented from becoming
[71]
2nd protective tape
[72]
On the other hand, in the electrode assembly 100 according to the first embodiment of the present invention, a second protective tape 190 is attached to the second electrode tab 152 , and the second protective tape 190 is the second electrode tab. The step difference between the 152 and the second winding start part 131 can be removed, and the separator 140 can be prevented from being damaged by the second electrode tab 152 .
[73]
In particular, the second protective tape 190 is made of a material having heat dissipation, and thus heat generated in the second electrode tab 152 can be effectively dissipated.
[74]
Here, the second protective tape 190 and the second protective member are provided with the same size, thickness, and material.
[75]
Accordingly, the electrode assembly 100 according to the first embodiment of the present invention can rapidly radiate heat generated outside and inside the electrode assembly to the outside, thereby preventing the electrode assembly from exploding or igniting.
[76]
Hereinafter, in describing another embodiment of the present invention, the same reference numerals are used for components having the same functions as those of the above-described embodiment, and overlapping descriptions are omitted.
[77]
[Secondary battery according to the second embodiment of the present invention]
[78]
In the secondary battery according to the second embodiment of the present invention, as shown in FIG. 7 , an electrode assembly 100 in which a first electrode and a second electrode are wound in a jelly-roll form with a separator interposed therebetween, the electrode and a case 200 for accommodating the assembly 100 .
[79]
Here, the electrode assembly includes a first electrode, a separator, a second electrode, and a separator.
[80]
Here, the first electrode is provided at a winding start point and has a first winding start part without a first electrode active material, a first winding end part provided at a winding end point and without a first electrode active material, and the first winding start part and the first winding part 1 is provided between the winding ends and includes a first coating portion coated with a first electrode active material.
[81]
The second electrode is provided at a winding start point and has a second winding start portion without a second electrode active material, a second winding end portion provided at a winding end point without a second electrode active material, and the second winding start portion and the second It is provided between the winding ends and includes a second coating portion coated with a second electrode active material.
[82]
The electrode assembly includes an electrode tab portion, and the electrode tab portion includes a first electrode tab provided at a first winding end of the first electrode, and a second electrode tab provided at a winding start portion of the second electrode. .
[83]
Here, a first protective member is included on the surface of the second winding end of the second electrode facing the first electrode tab, and is attached to the surface of the first winding start portion of the first electrode facing the second electrode tab. and a second protective member. Accordingly, heat generated in the electrode assembly by the first and second protective members can be effectively dissipated.
[84]
Accordingly, the secondary battery according to the second embodiment of the present invention can effectively dissipate heat generated in the electrode assembly.
[85]
[Electrode assembly according to the third embodiment of the present invention]
[86]
In the electrode assembly 100 according to the third embodiment of the present invention, as shown in FIG. 8 , a first protective member 160 is attached to one surface of the second winding end 132 of the second electrode 130 and , an auxiliary member 161 is attached to the other surface of the second winding end 132 of the second electrode 130 corresponding to the first protection member 160, and the first protection member 160 and the auxiliary member ( 161 has a structure connected by a connection portion 162 penetrating the second winding end portion (132).
[87]
Here, the first protective member 160 , the auxiliary member 161 , and the connecting part 162 are integrally formed, and are formed of a material having heat dissipation properties.
[88]
Therefore, in the electrode assembly 100 according to the third embodiment of the present invention, the heat transferred to the first protective member 160 is dispersed to the auxiliary member 161 through the connection part 162 to the electrode assembly 100 ) can be dissipated more effectively.
[89]
On the other hand, the connection part 162 is provided in plurality, and thus the first protection member 160 and the auxiliary member 161 can be connected through the plurality of connection parts 162 , and accordingly, the first protection member 160 . It is possible to more quickly disperse the heat transferred to the auxiliary member (161).
[90]
The scope of the present invention is indicated by the claims to be described later rather than the above detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts are possible.
[91]
[Explanation of code]
[92]
100: electrode assembly
[93]
110: first electrode
[94]
120, 140: separator
[95]
130: second electrode
[96]
150: electrode tab part
[97]
160: first protection member
[98]
170: second protection member
[99]
180: first protective tape
[100]
190: second protective tape

WE CLAIMS

An electrode assembly in which a first electrode and a second electrode are wound in a jelly-roll form with a separator interposed therebetween, provided at a winding start point and provided at a first winding start point without a first electrode active material, and a winding end point, the first a first electrode including a first winding end portion without an electrode active material, and a first coating portion provided between the first winding start portion and the first winding end portion and coated with a first electrode active material; A second winding start portion provided at the winding start point and without a second electrode active material, a second winding end portion provided at the winding end point and without a second electrode active material, and between the second winding start portion and the second winding end portion and a second electrode including a second coating part coated with a second electrode active material; an electrode tab portion including a first electrode tab provided at a first winding end portion of the first electrode and a second electrode tab provided at a winding start portion of the second electrode; and a first protective member attached to a surface of a second winding end portion of the second electrode facing the first electrode tab.
[Claim 2]
The electrode assembly of claim 1, wherein the first protection member is made of a material having heat dissipation.
[Claim 3]
The electrode assembly of claim 1 , wherein the first protective member has an area greater than an area of ​​the first electrode tab located in the first winding end portion.
[Claim 4]
The electrode assembly of claim 1, further comprising a second protective member attached to a surface of a first winding start portion of the first electrode facing the second electrode tab.
[Claim 5]
The electrode assembly according to claim 4, wherein the second protective member is made of a material having heat dissipation.
[Claim 6]
The electrode assembly of claim 4 , wherein the second protection member has an area greater than an area of ​​the second electrode tab located in the second winding start part.
[Claim 7]
The electrode assembly of claim 4, wherein the first protective member has a larger area than the second protective member.
[Claim 8]
The method according to claim 1, wherein the first winding start portion and the first winding end portion have different lengths when viewed in the longitudinal direction of the first electrode, the first winding end portion has a greater length than the first winding start portion An electrode assembly having a.
[Claim 9]
The method according to claim 1, wherein the second winding start portion and the second winding end portion have different lengths when viewed in the longitudinal direction of the second electrode, the second winding end portion has a greater length than the second winding start portion An electrode assembly having a.
[Claim 10]
The electrode assembly of claim 1, wherein a first protective tape is attached to the first electrode tab, and the first protective tape is made of a material having heat dissipation properties.
[Claim 11]
The electrode assembly of claim 1, wherein a second protective tape is attached to the second electrode tab, and the second protective tape is made of a material having heat dissipation.
[Claim 12]
The electrode assembly of claim 1, wherein the first electrode is an anode, and the second electrode is a cathode.
[Claim 13]
The method according to claim 1, wherein the first protection member is attached to one surface of the second winding end of the second electrode facing the first electrode tab, the second winding end of the second electrode corresponding to the first protection member An auxiliary member is attached to the other surface, and the first protective member and the auxiliary member are connected by a connecting portion penetrating a second winding end portion.
[Claim 14]
The electrode assembly according to claim 13, wherein the first protective member, the auxiliary member, and the connecting member are integrally formed and made of a heat-dissipating material.
[Claim 15]
an electrode assembly in which the first electrode and the second electrode are wound in a jelly-roll form with a separator interposed therebetween; a case accommodating the electrode assembly, wherein the electrode assembly is provided at a winding start point and has no first electrode active material; and a first electrode provided between the first winding start part and the first winding end part and comprising a first coating part coated with a first electrode active material; A second winding start portion provided at the winding start point and without a second electrode active material, a second winding end portion provided at the winding end point and without a second electrode active material, and between the second winding start portion and the second winding end portion and a second electrode including a second coating part coated with a second electrode active material; an electrode tab portion including a first electrode tab provided at a first winding end portion of the first electrode and a second electrode tab provided at a winding start portion of the second electrode; and a first protective member attached to a surface of a second winding end portion of the second electrode facing the first electrode tab.