protrudes and the second electrode tab protrudes from the second electrode sheet; (b) manufacturing a connection part having a first region made of a gel material having electrical conductivity and a second region attached to the first region and made of an electrically insulating material, wherein the second region is an upper surface of the connection part forming at least a portion of; (c) disposing the connection part on the upper part and the lower part of the electrode assembly, respectively, inserting at least a portion of the first electrode tab into the first region of the connection part disposed on the upper part of the electrode assembly, and the connection part disposed on the lower part of the electrode assembly inserting at least a portion of the second electrode tab into the first region of the ; and (e) accommodating the electrode assembly in a battery can, and coupling the cap assembly to an opening of the battery can to manufacture a finished secondary battery.
[23]
Between the steps (c) and (e), the method may further include (d) curing the first area of ​​the connection part to fix the first electrode tab or the second electrode tab to the first area.
[24]
In (b), the first region may be prepared in a gel form by mixing an organic conductor and a curing agent, and in (d), the first region may be cured through heat treatment.
Effects of the Invention
[25]
According to the present invention, compared to the related art, it facilitates the alignment of the electrode tabs protruding from the electrode assembly and facilitates the electrical connection between the electrode tabs and the battery can, or between the electrode tabs and the top cap, thereby having high output and high capacity. A secondary battery can be manufactured.
Brief description of the drawing
[26]
1 is a vertical cross-sectional view showing the structure of a secondary battery according to the present invention.
[27]
2 is a vertical cross-sectional view illustrating the structure of an upper connection part and a lower connection part of the secondary battery according to the first embodiment of the present invention.
[28]
3 is a plan view illustrating the upper surface structure of the upper connection part and the lower connection part of the secondary battery according to the first embodiment of the present invention.
[29]
4 is a flowchart illustrating a method for manufacturing a secondary battery according to a first embodiment of the present invention.
[30]
5 is a vertical cross-sectional view illustrating a structure of a lower connection part of a secondary battery according to a second embodiment of the present invention.
[31]
6 is a plan view illustrating a top surface structure of a lower connection part of a secondary battery according to a second embodiment of the present invention.
[32]
7 is a vertical cross-sectional view illustrating a structure of an upper connection part of a secondary battery according to a third embodiment of the present invention.
[33]
8 is a perspective view illustrating a state before winding a secondary battery according to a fourth embodiment of the present invention.
[34]
9 is a perspective view illustrating a state after winding a secondary battery according to a fourth embodiment of the present invention.
[35]
FIG. 10 is a plan view of FIG. 9 .
[36]
11 is a bottom view of FIG. 9 .
Best mode for carrying out the invention
[37]
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.
[38]
[Secondary battery according to the first embodiment of the present invention]
[39]
1 is a vertical cross-sectional view showing the structure of a secondary battery according to the present invention. And, FIG. 2 is a vertical cross-sectional view showing the structure of the upper connection part and the lower connection part of the secondary battery according to the first embodiment of the present invention, and FIG. 3 is the upper connection part and the lower part of the secondary battery according to the first embodiment of the present invention. It is a plan view showing the structure of the upper surface of the connection part.
[40]
1 , the secondary battery 10 according to the first embodiment of the present invention may include an electrode assembly 100 . The electrode assembly 100 may have a structure in which electrodes and separators are alternately disposed.
[41]
That is, the electrode assembly 100 may be a jelly-roll type electrode assembly manufactured by alternately arranging electrode sheets and separator sheets and then winding them. Also, the electrode assembly 100 may include a first electrode tab 110 and a second electrode tab 120 having a structure protruding outward.
[42]
For example, as for the electrode assembly 100, referring to some of the drawings of FIG. 8 , the first electrode sheet 111 and the second electrode sheet 121 are stacked with the separation sheet 130 interposed therebetween, and the jelly- It has a structure that is wound in the form of a roll.All. 8 , the first electrode tab 110 protrudes from the upper side of the first electrode sheet 111 , and the second electrode tab 120 protrudes from the lower side of the second electrode sheet 121 .
[43]
Meanwhile, the first electrode may be an anode, and the second electrode may be a cathode. Accordingly, the first electrode sheet is a positive electrode sheet, and the second electrode sheet is a negative electrode sheet. Also, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab. Of course, conversely, the first electrode may be a cathode and the second electrode may be an anode.
[44]
Hereinafter, in the present invention, the first electrode is an anode, and the second electrode is a cathode.
[45]
Also, the secondary battery 10 may further include a battery can 200 accommodating the electrode assembly 100 . The battery can 200 may have a cylindrical shape with an open top. That is, the secondary battery according to the present invention may be a cylindrical secondary battery. However, the present invention is not limited to a cylindrical secondary battery and may be applied to secondary batteries having various structures. For example, the present invention may be applied to a prismatic secondary battery.
[46]
In addition, the secondary battery 10 may further include a cap assembly 400 coupled to the opening of the battery can 200 . The cap assembly 400 includes a top cap 410 , a safety vent 420 , and a CID filter 430 provided between the top cap 410 and the safety vent 420 .
[47]
At this time, as shown in FIG. 1 , the first electrode tab 110 may protrude upward from the electrode assembly 100 , and the second electrode tab 120 may protrude downward from the electrode assembly 100 . .
[48]
Meanwhile, the secondary battery 10 according to the first embodiment of the present invention may further include a connection part 300 provided at the upper or lower portion of the electrode assembly 100 to face the electrode assembly 100 . As shown in FIG. 1 , the connection part 300 may include a connection part provided on an upper portion of the electrode assembly 100 and a connection part provided on a lower part of the electrode assembly 100 . In the present specification, the connection part provided on the upper part of the electrode assembly will be referred to as an upper connection part 300a, and the connection part provided on the lower part of the electrode assembly will be called a lower connection part 300b.
[49]
Meanwhile, as shown in FIGS. 2 and 3 , according to the present invention, the connection part may be divided into two or more regions having different materials. In more detail, as shown in FIGS. 2 and 3 , the connection parts 300 , 300a , and 300b may include a first region 310 and a second region 320 having different materials. In this case, the first region 310 may be made of a gel material having electrical conductivity, and the second region 320 may be made of a material having electrical insulation properties. Also, the second region 320 may be attached to the first region 310 .
[50]
In addition, the second region 320 having electrical insulation properties in the connecting portions 300 , 300a and 300b may form at least a portion of an upper surface of the connecting portion. For example, as shown in FIGS. 2 and 3 , the second region 320 forms a periphery of the upper surface of the connection parts 300 , 300a , and 300b , and the first region 310 includes the connection parts 300 , 300a . , 300b) may form a central portion of the upper surface.
[51]
Meanwhile, as shown in FIG. 1 , in the secondary battery 10 according to the first embodiment of the present invention, at least a portion of the first electrode tab 110 or the second electrode tab 120 is to be inserted into the connection part 300 . can For example, the first electrode tab 110 may be inserted into the upper connection part 300a , and the second electrode tab 120 may be inserted into the lower connection part 300b .
[52]
In particular, referring to FIGS. 1 and 2 together, the first electrode tab 110 may be inserted into the first region 310 having electrical conductivity among the upper connection part 300a, and the second electrode tab 120 is It may be inserted into the first region 310 having electrical conductivity among the lower connection portions 300b.
[53]
A gel (gel) is a colloidal solution thickened to a certain concentration or more, and a strong network structure is formed and hardened. Since a gel has an intermediate state between a fluid such as water or oil and a perfectly elastic body, it has properties similar to soft jelly.
[54]
According to the present invention, since the first electrode tab or the second electrode tab of the electrode assembly can be inserted into the first region of the upper connection part or the lower connection part, it is possible to easily align the plurality of electrode tabs protruding from the electrode assembly.
[55]
That is, as described above, since the first region is made of a gel material, when compared to a hard material, the electrode tab can be easily inserted into the first region, that is, the electrode tab can be inserted or inserted into the first region. . Accordingly, the electrode tab and the first region may be coupled without a separate additional process such as welding. In particular, in order to manufacture a secondary battery having a low resistance to have high output and high capacity, when a plurality of electrode tab bundles formed by gathering electrode tabs are formed, the plurality of electrode tab bundles are formed in the first region without a separate additional process such as welding. Since it can be inserted, a secondary battery having high output and high capacity can be easily manufactured.
[56]
As described above, according to the present invention, a plurality of electrode tab bundles may be inserted into the first region. Accordingly, in the first region 310 of the connection part 300 , a plurality of regions into which the first electrode tab 110 is inserted or the region into which the second electrode tab 120 is inserted may be formed. That is, as shown in FIG. 1 , in the first region 310 of the upper connection part 300a , the region into which the first electrode tab 110 is inserted is plural (eg, three as shown in FIG. 1 ). In the first region 310 of the lower connection part 300b, the region into which the second electrode tab 120 is inserted may be formed in a plurality (eg, three as shown in FIG. 1 ). can
[57]
Continuing to refer to FIG. 1 , in the secondary battery 10 according to the present invention, a beading portion B having a structure in which the battery can 200 is bent inwardly may be formed on the upper portion of the battery can 200 . In this case, the upper connection part 300a may be provided under the beading part (B). That is, the upper connection part 300a may be provided between the electrode assembly 100 and the beading part B.
[58]
As described above, in the connection part, the second region 320 having electrical insulation may form at least a part of an upper surface of the connection part, which may correspond to both the upper connection part 300a and the lower connection part 300b. However, the role of the second region 320 formed on the upper surface of the upper connection part 300a and the role of the second region 320 formed on the upper surface of the lower connection part 300b may be different from each other.
[59]
The second region 320 formed on the upper surface of the upper connection part 300a may be configured to prevent the upper connection part 300a from being electrically connected to the battery can.
[60]
That is, in the cylindrical secondary battery, since the battery can is electrically connected to the second electrode tab, the battery can has a second electrode (ie, a negative electrode), and the upper connection part 300a is connected to the first electrode tab 110 , so the upper connection part 300a has a first electrode (ie, an anode). Therefore, it is necessary to prevent the battery can 200 from being electrically connected to the upper connection part 300a.
[61]
In particular, in the structure of the secondary battery 10 according to the present invention, the upper connection part 300a is provided adjacent to the beading part B having an inwardly bent structure among the battery can 200, so the beading part B) It is necessary to prevent the upper connection part 300a and the battery can 200 from being electrically connected through the . Accordingly, as shown in FIG. 2 , the second region 320 having electrical insulation properties in the upper connection part 300a forms a periphery of the upper surface of the upper connection part 300a, so that the battery can 200 through the beading part B. ) and the upper connection part 300a can be prevented from being electrically connected. In particular, referring to FIG. 1 , the inner end of the second region 320 of the upper connecting portion 300a may be provided closer to the central axis A of the battery can 200 than the inner end of the beading portion B. have. In this case, it is possible to fundamentally block the inner end of the beading portion B from contacting the first region 310 of the upper connecting portion 300a. More preferably, the width of the first region 310 of the upper connection part 300a may be greater than the width of the beading part B.
[62]
On the other hand, the second region 320 formed on the upper surface of the lower connection part 300b is configured to prevent the electrode assembly 100 from being directly electrically connected to the lower connection part 300b without passing through the second electrode tab 120 . can be
[63]
As described above, since the electrode assembly 100 may have a structure in which electrodes and separators are alternately disposed, when the electrode assembly 100 comes into contact with the lower connection part 300b, the first electrode and the lower connection part of the electrode assembly A case in which 300b is electrically connected may occur.
[64]
However, since the lower connection part 300b is electrically connected to the second electrode tab 120 and has a second electrode (ie, negative electrode), the lower connection part 300b is electrically connected to the first electrode (ie, positive electrode). It is necessary to avoid being connected to
[65]
Accordingly, the second region 320 formed on the upper surface of the lower connection part 300b may be configured to prevent the first electrode from being electrically connected to the lower connection part 300b. That is, since the second region 320 having electrical insulation is formed on the upper surface of the lower connection part 300b, the area in which the electrode assembly 100 can be electrically connected to the lower connection part 300b may be reduced by that much.
[66]
Meanwhile, the first region 310 made of a gel material may be cured to fix the first electrode tab 110 or the second electrode tab 120 to the connection part 300 so as not to be separated. That is, the first region 310 includes a curing agent, that is, the first region 310 is cured by the curing agent, and the first electrode tab 110 or the second electrode tab 120 is connected to the connection part 300 . It can be fixed so that it cannot be separated. For example, the first region 310 includes an organic conductor and a curing agent. When the first region 310 is heat-treated, the first region 310 may be rigidly deformed while the curing agent is cured, and as a result, the connection part 300 may be damaged.The inserted first electrode tab 110 or the second electrode tab 120 may be fixed so as not to be separated. Therefore, it is possible to easily insert the first electrode tab or the second electrode tab into the first region of the connection part 300 when the secondary battery is manufactured, and the first electrode tab or the second electrode tab to the first region of the connection part 300 after the secondary battery is manufactured. It is possible to prevent the two electrode tabs from being separated. As a result, the efficiency and safety of work can be increased.
[67]
On the other hand, the organic conductor may be a silicone conductor that is a high-temperature or low-temperature curable silicone, and the curing agent may be an epoxy resin that changes into a thermosetting material. In particular, the curing agent may select a material having excellent electrical properties, and by adjusting the amount of the curing agent included in the first region, the rate of change to the solid phase may be controlled.
[68]
Hereinafter, a method for manufacturing a secondary battery according to a first embodiment of the present invention will be described.
[69]
[Method for manufacturing secondary battery according to the first embodiment of the present invention]
[70]
As shown in FIG. 4, the secondary battery manufacturing method according to the first embodiment of the present invention includes (a) an electrode assembly manufacturing step, (b) a connecting part manufacturing step, (c) a connecting part and electrode assembly combining step, (d) ) curing the connection part, and (e) manufacturing a finished secondary battery.
[71]
(a) In the electrode assembly manufacturing step, referring to FIG. 8 , the first electrode sheet 111 and the second electrode sheet 121 are stacked with the separation sheet 130 interposed therebetween, and the electrode is wound in a jelly-roll form. The assembly 100 is manufactured. Here, a plurality of first electrode tabs 110 protrude from the first electrode sheet 111 in the longitudinal direction of the first electrode sheet 111 , and the second electrode sheet 121 is formed on the second electrode sheet 121 . A plurality of second electrode tabs 120 protrude in the longitudinal direction. At this time, the plurality of first electrode tabs 110 and the plurality of second electrode tabs 120 are arranged along the first electrode sheet or the second electrode sheet wound in a jelly-roll shape, referring to FIG. 11 .
[72]
(b) the connection part manufacturing step is a connection part having a first region 310 made of an electrically conductive gel material and a second region 320 attached to the first region 310 and made of an electrically insulating material. (300) is prepared. Here, the second region 320 forms at least a portion of the upper surface of the connection part 300 .
[73]
Here, the first region 310 is prepared in the form of a gel by mixing an organic conductor and a curing agent. Meanwhile, the organic conductor may be a silicone conductor, and the curing agent may be an epoxy resin.
[74]
(c) In the step of combining the connection part and the electrode assembly, the connection part 300 is disposed on the upper part and the lower part of the electrode assembly 100, respectively. Here, the connection part disposed on the upper part of the electrode assembly is called an upper connection part, and the connection part disposed on the lower part of the electrode assembly is called a lower connection part. Next, at least a portion of the first electrode tab 110 is inserted into the first region 310 of the upper connection part 300a disposed on the electrode assembly 100 , and the lower portion disposed under the electrode assembly 100 . At least a portion of the second electrode tab 120 is inserted into the first region 310 of the connection part 300b.
[75]
At this time, since the connection part is made of a gel material, the first electrode tab and the second electrode tab can be inserted or inserted without a separate groove.
[76]
(d) curing the connection part is to harden the first region 310 of the connection part 300 to fix the first electrode tab 110 or the second electrode tab 120 to the first region 310 so as not to be separated. . That is, it is possible to harden the first region by curing the curing agent included in the first region 310 through heat treatment, and accordingly, the first electrode tab 110 or the second electrode tab inserted into the first region 310 . The electrode tab 120 may be fixed so as not to be separated.
[77]
(e) In the step of manufacturing the finished secondary battery, the electrode assembly 100 to which the connection part is coupled is accommodated in the battery can 200 , and the cap assembly 400 is coupled to the opening of the battery can 200 .
[78]
Then, the finished secondary battery 10 as shown in FIG. 1 can be manufactured.
[79]
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.
[80]
[Secondary battery according to the second embodiment of the present invention]
[81]
5 is a vertical cross-sectional view illustrating a structure of a lower connection part of a secondary battery according to a second embodiment of the present invention, and FIG. 6 is a plan view illustrating a top surface structure of a lower connection part of a secondary battery according to a second embodiment of the present invention. to be.
[82]
As shown in FIGS. 2 and 3 , according to the first embodiment of the present invention, the second region 320 may form the periphery of the upper surface of the lower connection part 300b, but As described above, according to the second embodiment of the present invention, the second region 320 may form the entire upper surface of the lower connection part 300b. In this case, it is possible to more effectively block the electrode assembly 100 from being directly electrically connected to the lower connection part 300b without passing through the second electrode tab 120 (refer to FIG. 1 ).
[83]
On the other hand, when the second region 320 having electrical insulation properties forms the entire upper surface of the lower connection part 300b as in the second embodiment of the present invention, the second electrode tab 120 (refer to FIG. 1 ) is connected to the lower connection part ( It may be inserted into the first region 310 through the second region 320 of 300b).
[84]
Referring back to FIG. 1 , in the secondary battery 10 according to the present invention, the lower connection part 300b may be provided in close contact with the lower surface of the battery can 200 . More preferably, the lower connection part 300b may be attached to the lower surface of the battery can 200 . Accordingly, the lower connection part 300b is electrically connected to the battery can 200 , and as a result, the battery can may have a second electrode.
[85]
As described above, in the cylindrical secondary battery, the battery can has the second electrode. According to the prior art, the second electrode tab or the second electrode tab bundle of the electrode assembly is bonded to the lower surface of the battery can, so that the battery can becomes the second electrode. electrode was put on. In this case, there is a problem in that a process of welding the second electrode tab to the lower surface of the battery can is separately required. In particular, in the case of a secondary battery in which a plurality of second electrode tab bundles are formed to have high output and high capacity, a plurality of regions to which the second electrode tab bundle is welded are also formed on the lower surface of the battery can, so that the welding process is complicated and the welding process is difficult. There was also a problem in that the lower surface of the battery can was damaged.
[86]
However, according to the present invention, there is no separate process of welding the second electrode tab or the second electrode tab bundle to the lower surface of the battery can, since the lower connection part into which the second electrode tab is inserted is closely adhered to or attached to the lower surface of the battery can. , it is possible to easily manufacture a secondary battery in which a plurality of second electrode tab bundles are formed while solving the problem of damage to the lower surface of the battery can.
[87]
Meanwhile, since the secondary battery 10 according to the present invention may be a cylindrical secondary battery, it may further include a cap assembly 400 having a top cap 410 , a CID filter 430 , and a safety vent 420 . The CID filter 430 or the safety vent 420 may be provided on the upper connection part 300a.
[88]
The CID filter 430 may be configured to block the current of the secondary battery when the internal temperature of the secondary battery rises, and the safety vent 420 is broken when the internal pressure of the secondary battery rises, thereby removing the gas inside the secondary battery. It may be a configuration that discharges.
[89]
According to the present invention, the first region 310 of the upper connection part 300a may be attached to the CID filter 430 or the safety vent 420 . Accordingly, the upper connection part 300a may be electrically connected to the CID filter 430 or the safety vent 420 .
[90]
In the cylindrical secondary battery, since the first electrode tab of the electrode assembly is electrically connected to the CID filter or the safety vent, the CID filter or the safety vent has a first electrode (ie, a positive electrode). To this end, according to the prior art, the first electrode tab is attached to the CID filter or the safety vent by welding.
[91]
However, according to the prior art, as in the case of the second electrode tab, there is a problem in that a process of welding the first electrode tab to the CID filter or a safety vent is separately required, and a plurality of bundles of the first electrode tabs are required to have high output and high capacity. In the case of the formed secondary battery, since a plurality of regions where the first electrode tab bundle is welded are formed on the CID filter or the safety vent, the welding process is complicated, and the CID filter or the safety vent is damaged by the welding process.
[92]
However, according to the present invention, without a separate process of welding the first electrode tab or the first electrode tab bundle to the CID filter or the safety vent, the first electrode tab or the first electrode tab bundle and the CID filter (or the safety vent) ) can be electrically connected, so that it is possible to easily manufacture a secondary battery in which a plurality of first electrode tab bundles are formed while solving the problem of damage to the CID filter or the safety vent.
[93]
[Secondary battery according to the third embodiment of the present invention]
[94]
7 is a vertical cross-sectional view illustrating a structure of an upper connection part of a secondary battery according to a third embodiment of the present invention.
[95]
According to the third embodiment of the present invention, in the upper connection part 300a, the second region 320 not only forms at least a part of the upper surface of the upper connection part 300a, but also may additionally form at least a part of the lower surface of the upper connection part 300a. .
[96]
More preferably, according to the third embodiment of the present invention, the second region 320 may additionally form the entire lower surface of the upper connection part 300a. In this case, the first electrode tab protruding upward from the electrode assembly may penetrate the second region 320 formed on the lower surface of the upper connection part 300a and be inserted into the first region 310 .
[97]
According to the third embodiment of the present invention, when the second region 320 forms the entire lower surface of the upper connection part 300a, similarly to the case of the second embodiment of the present invention, the electrode assembly 100 is formed by the first It is possible to more effectively block direct electrical connection with the upper connection part 300a without passing through the electrode tab 110 (refer to FIG. 1 ).
[98]
On the other hand, although not shown in the drawings, according to the first embodiment of the present invention, the second region 320 is the upper surface of the lower connection part 300b.In the case of forming a perimeter, the portion where the second region 320 is formed on the upper surface of the lower connection part 300b may protrude upward from the portion where the first region 310 is formed on the upper surface of the lower connection part 300b. . In this case, since the electrode assembly 100 first contacts the second region 320 before direct contact with the first region 310 of the lower connection part 300b, the second electrode tab 120 (refer to FIG. 1 ) It is not possible to prevent direct electrical connection between the lower connection part 300b and the electrode assembly 100 without passing through it.
[99]
In addition, although not shown in the drawings, according to the third embodiment of the present invention, when the second region 320 is formed only on a part of the lower surface of the upper connection part 300a, the second region 320 is formed on the lower surface of the upper connection part 300a. The portion in which the second region 320 is formed may protrude downward from the lower surface of the upper connecting portion 300a than the portion in which the first region 310 is formed. In this case, since the electrode assembly 100 first comes into contact with the second region 320 before direct contact with the first region 310 of the upper connection part 300a, the first electrode tab 110 (refer to FIG. 1 ) It is possible to effectively prevent direct electrical connection between the upper connection part 300a and the electrode assembly 100 without passing through them.
[100]
[Secondary battery according to the fourth embodiment of the present invention]
[101]
8 to 11 , in the secondary battery according to the fourth embodiment of the present invention, the first electrode sheet 111 and the second electrode sheet 121 are formed with the separation sheet 130 interposed therebetween. It has a structure that is laminated and wound in the form of a jelly-roll. A first electrode tab 110 protrudes from the first electrode sheet 111 , and a second electrode tab 120 protrudes from the second electrode sheet 121 .
[102]
Here, the first electrode tab 110 protrudes in a state of being elongated in the longitudinal direction of the first electrode sheet 111 (ie, as seen in FIG. 8 , one first electrode tab is disposed on the upper surface of the first electrode sheet). 1 is extended in the left and right direction of the electrode sheet), and as shown in FIG. 10 , it is wound in a jelly-roll form in the same way as the first electrode sheet wound in a jelly-roll form. The first electrode tab having such a structure is inserted into the first region 310 of the upper connection part 300a in a state of being wound in a jelly-roll shape, and accordingly, even if the length of the first electrode tab is greatly increased, the first electrode tab is wound up. The first electrode tab can be effectively inserted into the first region.
[103]
Meanwhile, the second electrode tab 120 is formed in a jelly-roll shape in the same way as the first electrode tab wound in a jelly-roll shape, and may be inserted into the lower connection part. That is, the second electrode tab 120 protrudes in a state of being elongated in the longitudinal direction of the second electrode sheet 121 , and is wound in a jelly-roll shape in the same manner as the second electrode sheet wound in a jelly-roll shape. The second electrode tab having such a structure is inserted into the first region of the lower connection part in a state of being wound in a jelly-roll shape, and thus, even if the length of the second electrode tab is greatly increased, the second electrode tab is inserted into the first region. can be effectively inserted into
[104]
Meanwhile, as shown in FIG. 10 , the first electrode tab may be formed to be wound in a jelly-roll shape, and the second electrode tab may be formed in plurality as shown in FIG. 11 . Of course, it can also be formed the other way around.
[105]
On the other hand, the first to fourth embodiments of the present invention described above may be implemented as an independent type of embodiment, but may be used in a mixed form to implement a single secondary battery. That is, for example, in the secondary battery according to the present invention, the upper connection part 300a is used for the connection according to the first embodiment of the present invention, and the lower connection part 300b is used for the connection part according to the second embodiment of the present invention. can
[106]
[Battery Pack]
[107]
The battery pack according to the present invention may include a plurality of secondary batteries. The contents of the secondary battery provided in the Jinji pack according to the present invention are replaced with the contents described above for the secondary battery of the present invention.
[108]
In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is described below with the technical idea of ​​the present invention by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various implementations are possible within the equivalent scope of the claims.
[109]
[Explanation of code]
[110]
10: secondary battery
[111]
100: electrode assembly
[112]
110: first electrode tab
[113]
120: second electrode tab
[114]
200: battery can
[115]
300: connection
[116]
300a: upper connection part
[117]
300b: lower connection part
[118]
310: first area
[119]
320: second area
[120]
A: the central axis of the battery can
[121]
B: beading part

Claims

[Claim 1]
It has a structure in which a first electrode sheet and a second electrode sheet are laminated and wound with a separation sheet interposed therebetween, wherein a first electrode tab protrudes from the first electrode sheet and a second electrode tab protrudes from the second electrode sheet being an electrode assembly; a battery can accommodating the electrode assembly; and a connection part provided on an upper or a lower part of the electrode assembly to face the electrode assembly, wherein the connection part includes: a first region made of a gel material having electrical conductivity; and a second region attached to the first region and made of an electrically insulating material, wherein the second region forms at least a portion of an upper surface of the connection part, and the first electrode tab or the second electrode tab at least a portion of the secondary battery is inserted into the first region of the connection part.
[Claim 2]
The method according to claim 1, A beading portion having a structure in which the battery can is bent inwardly is formed on the upper portion of the battery can, and the connecting portion is a connection portion (hereinafter, 'upper connection portion') provided on an upper portion of the electrode assembly, and the upper portion A connection part is provided under the beading part, and the second region forms a periphery of the upper surface of the upper connection part, and the inner end of the second region is at the central axis (A) of the battery can rather than the inner end of the beading part. Secondary batteries provided adjacent to each other.
[Claim 3]
The secondary battery of claim 1 , wherein the connection part is a connection part (hereinafter, 'lower connection part') provided under the electrode assembly, and the lower connection part is provided in close contact with a lower surface of the battery can.
[Claim 4]
The rechargeable battery of claim 2 , wherein a plurality of the first electrode tabs protrude upward from the electrode assembly, and the plurality of first electrode tabs are inserted into the first region of the upper connection part.
[Claim 5]
The secondary battery of claim 3 , wherein a plurality of the second electrode tabs protrude downward from the electrode assembly, and the plurality of second electrode tabs are inserted into the first region of the lower connection part.
[Claim 6]
The secondary battery of claim 3 , wherein the second region forms a periphery of an upper surface of the lower connection part.
[Claim 7]
The secondary battery of claim 5 , wherein the second region forms an entire upper surface of the lower connection part, and the second electrode tab penetrates the second region of the lower connection part and is inserted into the first region.
[Claim 8]
The secondary battery of claim 4 , wherein the second region further forms the entire lower surface of the upper connection part, and the first electrode tab penetrates the second region formed on the lower surface of the upper connection part and is inserted into the first region. .
[Claim 9]
The method according to claim 2, further comprising a CID filter or a safety vent provided on an upper portion of the upper connection portion, wherein the first region of the upper connection portion is attached to the CID filter or the safety vent and is electrically connected to the CID filter or the safety vent. secondary battery connected to
[Claim 10]
The method according to claim 2, wherein the first electrode tab is wound in the same manner as the first electrode sheet that protrudes and is wound in a state extending in the longitudinal direction of the first electrode sheet, and the first electrode tab is wound on the upper connection part A secondary battery inserted into the first area of
[Claim 11]
The method according to claim 3, wherein the second electrode tab protrudes in a state of being elongated in the longitudinal direction of the second electrode sheet, and is wound in the same manner as the wound second electrode sheet, and the second electrode tab is wound in the lower portion. A secondary battery inserted into the first region of the connection part.
[Claim 12]
The secondary battery of claim 1 , wherein the first region of the gel material includes an organic conductor and a curing agent, and the first region is cured by the curing agent to fix the first electrode tab or the second electrode tab.
[Claim 13]
(a) stacking and winding a first electrode sheet and a second electrode sheet with a separation sheet interposed therebetween to manufacture an electrode assembly, wherein the first electrode tab protrudes from the first electrode sheet and the second electrode sheet has a second electrode 2 protruding the electrode tab; (b) manufacturing a connection part having a first region made of a gel material having electrical conductivity and a second region attached to the first region and made of a material having electrical insulation, wherein the second region is an upper surface of the connection part forming at least a portion of; (c) disposing the connection part on the upper part and the lower part of the electrode assembly, respectively, inserting at least a portion of the first electrode tab into the first region of the connection part disposed on the upper part of the electrode assembly, and the connection part disposed on the lower part of the electrode assembly inserting at least a portion of the second electrode tab into the first region of the ; and (e) accommodating the electrode assembly in a battery can, and coupling a cap assembly to an opening of the battery can to manufacture a finished secondary battery.
[Claim 14]
The method of claim 13 , further comprising, between steps (c) and (e), (d) curing the first region of the connection part to fix the first electrode tab or the second electrode tab to the first region. a secondary battery manufacturing method.
[Claim 15]
The method of claim 14, wherein in (b), the first region is prepared in a gel form by mixing an organic conductor and a curing agent, and in (d), the first region is cured through heat treatment.