Title of invention: Top cap for secondary battery, secondary battery and manufacturing method of the secondary battery
Technical field
[One]
Mutual citation with related applications
[2]
This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0004804 filed on January 14, 2019, and all contents disclosed in the documents of the Korean patent application are included as part of this specification.
[3]
Technical field
[4]
The present invention relates to a top cap for a secondary battery, a secondary battery, and a method of manufacturing the secondary battery, and more particularly, a top cap for a secondary battery capable of improving the sealing property of the secondary battery compared to the conventional It relates to a manufacturing method.
Background
[5]
Secondary batteries capable of repetitive charging and discharging may be divided into pouch-type secondary batteries, prismatic secondary batteries, cylindrical secondary batteries, etc. according to their structure and manufacturing method.
[6]
Among them, a cylindrical secondary battery generally has a structure in which an electrode assembly is accommodated in a battery can having a cylindrical shape and a top cap is coupled to an upper portion of the battery can.
[7]
Meanwhile, a method of manufacturing a secondary battery generally includes an activation process of charging the electrode assembly to activate the electrode assembly. During this activation process, gas is generated from the electrolyte solution, and the pressure inside the secondary battery increases due to this gas.
[8]
However, according to the prior art, since the activation process of the cylindrical secondary battery is performed after the top cap is attached to the top of the battery can and the inside of the secondary battery is sealed, the gas generated during the activation process cannot be discharged to the outside. There is a problem that the internal structure of the secondary battery may be damaged or the secondary battery may explode.
Detailed description of the invention
Technical challenge
[9]
The problem to be solved by the present invention is to improve the stability of the secondary battery by discharging the gas inside the secondary battery generated during the activation process during the manufacturing process of the secondary battery.
Means of solving the task
[10]
According to a first aspect of the present invention for achieving the above object, a top cap for a secondary battery, comprising: a circumferential region forming an outer peripheral surface of the top cap; A middle region forming a central portion of the top cap; A connection region connecting the peripheral region and the middle region; And a protruding region protruding downward from the peripheral region, the middle region, or the connection region. A top cap for a secondary battery comprising a is provided.
[11]
The middle region may have a disk shape, and the protrusion region may protrude downward from the center of the middle region.
[12]
The protruding region includes a rod portion having a one (1) shape and extending downward; It may include.
[13]
The protruding region may include a protrusion formed on a side surface of the rod; It may further include.
[14]
The protruding region may include a zigzag portion having a zigzag shape and extending downward; It may include.
[15]
According to a second aspect of the present invention for achieving the above object, a battery case with an open top; An electrode assembly provided inside the battery case; A through-hole forming member provided on the electrode assembly and having a through-hole; And a top cap for the secondary battery coupled to an upper portion of the battery case. Including, at least a portion of the protruding region is provided with a secondary battery inserted into the through hole.
[16]
A sealing sheet having a sheet shape, provided between the protruding region and the through hole, at least partially inserted into the through hole; It may further include.
[17]
The through-hole forming member may include at least one of a PTC element and a cap plate.
[18]
According to a third aspect of the present invention for achieving the above object, the step of providing a battery case with an open top; Accommodating an electrode assembly in the battery case; Providing a through-hole forming member having a through-hole formed on the electrode assembly; Coupling a top cap located above the through-hole forming member and protruding downward and including a protruding region having a cross section shape corresponding to the through-hole to an upper portion of the battery case; A charging step of charging the electrode assembly; And a sealing step in which the protruding region moves downward so that the protruding region seals the through hole of the through-hole forming member. A method for manufacturing a secondary battery comprising a is provided.
[19]
Prior to the sealing step, providing a sheet-shaped sealing sheet above the through hole of the through hole forming member; In the sealing step, as the protruding region moves downward, at least a portion of the sealing sheet may be inserted into the through hole of the through hole forming member.
Effects of the Invention
[20]
According to the present invention, the stability of the secondary battery may be improved by discharging the gas inside the secondary battery generated during the activation process during the manufacturing process of the secondary battery.
Brief description of the drawing
[21]
1 is a perspective view showing the structure of a top cap for a secondary battery according to a first embodiment of the present invention.
[22]
2 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to the first embodiment of the present invention.
[23]
3 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to a second embodiment of the present invention.
[24]
4 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to a third embodiment of the present invention.
[25]
5 is a side cross-sectional view showing a state before a sealing step by a protruding region is performed in a method of manufacturing a secondary battery according to the present invention.
[26]
6 is a side cross-sectional view showing a state after the manufacturing of the secondary battery is completed after the sealing step by the protruding region is performed in the secondary battery manufacturing method according to the present invention.
Mode for carrying out the invention
[27]
Hereinafter, a structure of a top cap for a secondary battery according to the present invention will be described with reference to the drawings.
[28]
[29]
Top cap for secondary battery
[30]
1 is a perspective view showing a structure of a top cap for a secondary battery according to a first embodiment of the present invention, and FIG. 2 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to a first embodiment of the present invention.
[31]
As shown in FIGS. 1 and 2, the top cap 300 for a secondary battery according to the first embodiment of the present invention includes a circumferential region 310 and a top cap 300 forming an outer circumferential surface of the top cap 300. It may include a middle region 320 forming a center and a connection region 330 connecting the circumferential region 310 and the middle region 320. As shown in FIGS. 1 and 2, the center region 320 of the top cap 300 according to the first embodiment of the present invention may protrude upward, and the connection region 330 is the top cap 300. Can form a step difference. In addition, the connection region 330 may be divided into several configurations again, and several configurations may be spaced apart from each other, and at least one open region H is formed between the connection regions 330 of the top cap 300 Can be. 1 illustrates a case in which the circumferential region 310 and the middle region 320 of the top cap 300 have a ring shape and a disk shape, respectively, but the shapes of the circumferential region 310 and the middle region 320 are illustrated in FIG. It is not limited to 1.
[32]
The circumferential region 310, the middle region 320, and the connection region 330 of the top cap 300 may include iron-based metal. For example, the circumferential region 310, the middle region 320, and the connection region 330 of the top cap 300 may be formed of nickel plated iron.
[33]
1 and 2, the top cap 300 for a secondary battery according to the first embodiment of the present invention has a shape protruding downward from the circumferential region 310, the middle region 320, or the connection region 330. It may include a protruding region 340 of 1 and 2 illustrate a state in which the protruding region 340 protrudes downward from the center of the center region 320 having a disk shape.
[34]
As shown in FIG. 1, the protruding region 340 may include a rod portion 342 that has a one (1) shape and extends downward. For example, the rod portion 342 may have a cylindrical shape. In addition, as shown in FIG. 2, the lower end of the rod portion 342 may be positioned above the lower surface of the circumferential region 310. It can be understood that the lower end of the rod portion 342 is positioned above the extended area (refer to the dotted line in FIG. 2) of the lower surface of the peripheral area 310.
[35]
As will be described later, the protruding region 340 of the top cap 300 according to the present invention may be inserted into a through hole of a through hole forming member 200 (refer to FIG. 6) provided in the secondary battery.
[36]
3 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to a second embodiment of the present invention. The description of the circumferential region 310, the middle region 320, and the connection region 330 of the top cap 300 for a secondary battery according to the second embodiment of the present invention is Let's replace it with the description of the battery top cap.
[37]
As shown in FIG. 3, the protruding area 340 of the top cap 300 for a secondary battery according to the second embodiment of the present invention has a one (1) shape similar to that of the first embodiment of the present invention. It may include a rod portion 342 extending to. In addition, according to the second exemplary embodiment of the present invention, the protrusion region 340 may further include a protrusion 344 formed to be convex on the side of the rod portion 342. As shown in FIG. 3, a plurality of protrusions 344 may be provided. In addition, as shown in FIG. 3, the lower end of the rod portion 342 may be positioned above the lower surface of the circumferential region 310.
[38]
As will be described later, the protruding region 340 of the top cap 300 according to the present invention may be a configuration inserted into a through hole of a through-hole forming member 200 (see FIG. 6) provided inside the secondary battery. When the protruding portion 344 is formed in the protruding region 340 as in the second embodiment of the present invention, the bonding force of the protruding region 340 in the through hole may be improved by the protruding portion 344.
[39]
4 is a side cross-sectional view showing the structure of a top cap for a secondary battery according to a third embodiment of the present invention. The description of the circumferential region 310, the middle region 320, and the connection region 330 of the top cap 300 for a secondary battery according to the second embodiment of the present invention is also Let's replace it with the description of the battery top cap.
[40]
As shown in FIG. 4, the protruding area 340 of the top cap 300 for a secondary battery according to the third embodiment of the present invention may include a zigzag portion 346 extending downwardly in a zigzag shape. 4 illustrates a case in which the zigzag portion 346 is bent at an angle, but unlike this, the zigzag portion 346 may have a bent shape to have a curved surface in a wave shape. In addition, as shown in FIG. 4, the lower end of the zigzag portion 346 may be positioned above the lower surface of the circumferential region 310.
[41]
As will be described later, the protruding region 340 of the top cap 300 according to the present invention may be a configuration inserted into a through hole of a through-hole forming member 200 (see FIG. 6) provided inside the secondary battery. When the zigzag portion 346 is included in the protruding region 340 as in the third embodiment of the present invention, the bonding force of the protruding region 340 in the through hole may be improved.
[42]
Hereinafter, the structure of the secondary battery according to the present invention will be described with reference to the above description and drawings.
[43]
[44]
Secondary battery
[45]
5 is a side cross-sectional view showing a state before the sealing step by the protruding region is performed in the secondary battery manufacturing method according to the present invention, and FIG. 6 is a sealing step by the protruding region in the secondary battery manufacturing method according to the present invention. Later, it is a side cross-sectional view showing a state after the manufacturing of the secondary battery is completed.
[46]
The description of the structure of the top cap 300 will be replaced with the above description of the structure of the top cap 300 according to the first to third embodiments of the present invention.
[47]
5 and 6, the secondary battery 10 according to the present invention may include a battery case 100 with an open top and an electrode assembly 150 provided inside the battery case 100. have. The battery case 100 may have a cylindrical shape, but the shape of the battery case 100 may be variously applied within a range not contradicting the contents of the present invention.
[48]
Subsequently, referring to FIGS. 5 and 6, a top cap 300 may be coupled to an upper portion of the battery case 100. A gasket 500 may be provided between the inner surface of the top of the battery case 100 and the outer surface of the top cap 300 so that the coupling between the battery case 100 and the top cap 300 can be made more robustly. have.
[49]
In addition, the secondary battery 10 according to the present invention may include a through-hole forming member 200 provided on an upper portion of the electrode assembly and having a through-hole 200a formed therein.
[50]
The through-hole forming member 200 may include a PTC element 210 or a cap plate 220 that blocks a current of a secondary battery by rapidly increasing electrical resistance when the temperature rises. 5 and 6, in the secondary battery 10, the electrode assembly 150 is connected to the cap plate 220 by the electrode tab 150a, and the PTC element 210 is provided on the cap plate 220. The structure is shown.
[51]
Continuing with reference to FIG. 6, at least a part of the protruding regions 340 in the secondary battery 10 according to the present invention may be inserted into the through hole 200a formed in the through hole forming member 200. 6 shows a state in which the protruding region 340 is inserted into the through hole 210a of the PTC element 210 and the through hole 220a of the cap plate 220. According to the present invention, since the protruding region 340 of the top cap 300 is inserted into the through hole 200a formed in the through hole forming member 200, sealing property inside the secondary battery 10 may be secured.
[52]
Meanwhile, the shape of the horizontal cross-section of the protrusion region 340 may correspond to the shape of the through hole 200a so that the protrusion region 340 can be smoothly inserted into the through hole 200a. In this case,'the shape of the horizontal cross-section of the protruding area corresponds to the shape of the through hole' means that the protruding area 340 has an area enough to be inserted into the through hole 200a, and the shape of the horizontal cross-section of the protruding area It does not mean only the case where the shape of the through hole is similar.
[53]
In this case, the area of ​​the horizontal cross-section of the protruding region 340 may be smaller than the area of ​​the through hole 200a. In this case, the protruding region 340 may be smoothly inserted into the through hole 200a. However, unlike this, the area of ​​the horizontal cross section of the protruding region 340 may be larger than the area of ​​the through hole 200a. In this case, since the protruding region 340 is inserted into the through hole 200a in a force-fitting manner, the sealing property of the secondary battery 10 may be improved.
[54]
In addition, the secondary battery 10 according to the present invention has a sheet shape and is provided between the protruding region 340 and the through hole 200a, and further includes a sealing sheet 400 having at least a part inserted into the through hole 200a. Can include. When the sealing sheet 400 is provided, the sealing property of the inside of the secondary battery 10 may be improved.
[55]
Meanwhile, according to the present invention, the protruding region 340 may include a plastic material. More preferably, the material of the protruding region 340 may be the same as that of the gasket 500. When the material of the protruding area 340 is the same as the material of the gasket 500, since there is no need to employ a separate material for manufacturing the protruding area 340, it is necessary to manufacture the secondary battery 10 according to the present invention. The required cost can be minimized.
[56]
Hereinafter, a method of manufacturing a secondary battery according to the present invention will be described with reference to the foregoing contents and drawings.
[57]
[58]
Secondary battery manufacturing method
[59]
Referring to FIGS. 1 to 6, the method of manufacturing a secondary battery according to the present invention includes the steps of providing a battery case 100 with an open top, accommodating the electrode assembly 150 inside the battery case 100, Providing a through-hole forming member 200 having a through-hole 200a formed on an upper portion of the electrode assembly 150, located above the through-hole forming member 200 and protruding downwardly, the circumferential region 310, and the center region The battery case 100 includes a top cap 300 including a protruding region 340 that protrudes downward from the 320 or the connection region 330 and has a shape of a horizontal cross section corresponding to the through hole 200a. ) Bonding to the top of the; It may include.
[60]
In addition, the secondary battery manufacturing method according to the present invention includes a charging step of activating the electrode assembly 150 by charging the electrode assembly 150, and moving the protruding region 340 downward by pressing the top surface of the top cap 300 By doing so, the protruding region 340 may further include a sealing step of sealing the through hole 200a of the through hole forming member 200.
[61]
According to the present invention, after the through-hole 200a of the through-hole forming member 200 is opened, the electrode assembly 150 is activated to discharge the gas generated inside the secondary battery, and the protruding region 340 is formed into the through-hole 200a. ) To prevent damage to the internal structure of the secondary battery or explosion of the secondary battery due to gas generated during the activation process of the electrode assembly.
[62]
In addition, the method for manufacturing a secondary battery according to the present invention is performed before the sealing step, further comprising the step of providing a sheet-shaped sealing sheet 400 on the top of the through hole 200a of the through hole forming member 200 Can include. In this case, in the sealing step, at least a part of the sealing sheet 400 may be inserted into the through hole 200a of the through hole forming member 200 as the protruding region 340 moves downward.
[63]
Meanwhile, in order for the protruding region 340 of the top cap 300 to effectively seal the through hole 200a according to the present invention, the top cap is used when pressing the top surface of the top cap 300 in the sealing step. The upper surface of 300 may be a material having a sufficient level of ductility to be deformed. In addition, the top cap 300 may be made of a material having rigidity such that the upper surface of the top cap 300 does not return to its original state due to the pressure inside the secondary battery 10.
[64]
[65]
In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following description 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 equal range of the claims to be made.
Claims
[Claim 1]
A top cap for a secondary battery, comprising: a circumferential region forming an outer peripheral surface of the top cap; A middle region forming a central portion of the top cap; A connection region connecting the peripheral region and the middle region; And a protruding region protruding downward from the peripheral region, the middle region, or the connection region. Top cap for a secondary battery comprising a.
[Claim 2]
The top cap for a secondary battery of claim 1, wherein the middle region has a disk shape, and the protrusion region protrudes downward from the center of the middle region.
[Claim 3]
The method according to claim 1, wherein the protruding region comprises: a rod portion having a one (1) shape and extending downward; Top cap for a secondary battery comprising a.
[Claim 4]
The method of claim 3, wherein the protruding region comprises: a protrusion formed on a side surface of the rod; Top cap for secondary batteries further comprising a.
[Claim 5]
The method of claim 1, wherein the protruding region comprises: a zigzag portion having a zigzag shape and extending downward; Top cap for a secondary battery comprising a.
[Claim 6]
A battery case with an open top; An electrode assembly provided inside the battery case; A through-hole forming member provided on the electrode assembly and having a through-hole; And a top cap for a secondary battery according to claim 1, which is coupled to an upper portion of the battery case. And at least a portion of the protruding region is inserted into the through hole.
[Claim 7]
The method of claim 6, further comprising: a sealing sheet having a sheet shape, provided between the protruding region and the through hole, and at least partially inserted into the through hole; Secondary battery comprising a further.
[Claim 8]
The secondary battery of claim 6, wherein the through-hole forming member includes at least one of a PTC element and a cap plate.
[Claim 9]
Providing a battery case with an open top; Accommodating an electrode assembly in the battery case; Providing a through-hole forming member having a through-hole formed on the electrode assembly; Coupling a top cap located above the through-hole forming member and protruding downward and including a protruding region having a cross section shape corresponding to the through-hole to an upper portion of the battery case; A charging step of charging the electrode assembly; And a sealing step in which the protruding region moves downward so that the protruding region seals the through hole of the through-hole forming member. Secondary battery manufacturing method comprising a.
[Claim 10]
[10] The method of claim 9, further comprising: before the sealing step, providing a sheet-shaped sealing sheet above the through hole of the through hole forming member; And further comprising, in the sealing step, at least a part of the sealing sheet is inserted into the through hole of the through hole forming member as the protruding region moves downward.