KR101396703B1 - Apparatus of Removing Gas and Cylinder type Secondary Battery using the same - Google Patents

Abstract

The present invention relates to a gas removing device for efficiently discharging gas generated in a battery to the outside of a battery by constituting a gas removing device for communicating or closing the inside and outside of the battery with the applied pressure in a cap assembly, .

To this end, the present invention provides an electrode assembly comprising: an electrode assembly; a can containing the electrode assembly; a cap assembly sealing the upper opening of the can and having a through hole formed at one side thereof; And a gas removing device for communicating or closing the inside and the outside.

Therefore, according to the present invention, it is possible to effectively remove the gas generated in the inside of the battery, in particular to prevent the malfunction of the current interruption element due to the internal gas pressure before shipment, Defects can be prevented.

Gas eliminator, cap assembly, through-hole, cylindrical, secondary battery

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas removing apparatus and a cylindrical secondary battery using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical rechargeable battery, and more particularly, to a cap rechargeable battery which comprises a cap assembly that includes a gas removing device that communicates or closes the inside and the outside of a battery according to an applied pressure, And a cylindrical secondary battery using the same.

BACKGROUND OF THE INVENTION [0002] Generally, a cylindrical rechargeable battery includes a cylindrical electrode assembly, a cylindrical can having an electrode assembly and an electrolyte therein, a cap coupled to an upper opening of the can to seal the can, Assembly.

The structure and manufacturing process of the cylindrical secondary battery will be briefly described. The electrode assembly is wound in a jelly roll state in the order of a cathode plate, a separator, and an anode plate. A cylindrical center pin is inserted into the center of the electrode assembly. The center pin prevents deformation of the electrode assembly and discharges the gas inside the battery due to heat generation to the upper part of the battery. Upper and lower insulating plates are formed on the top and bottom of the electrode assembly. The upper and lower insulating plates prevent the electrode assembly from contacting the cap assembly or the cylindrical can.

The electrode assembly is received in a cylindrical can, and a beading for preventing the flow of the electrode assembly in the can is formed on the upper sidewall of the can. In addition, a gasket is provided on the inner wall of the top opening of the can to seal the components, engage and seal the interior of the can, and a cap assembly is installed inside the gasket to close the top opening of the can.

In order to prevent an explosion when the cylindrical secondary battery is overcharged, the cap assembly includes a safety vent in which the shape is deformed when the internal pressure is changed by overcharging, a circuit in which the current is blocked by deformation of the safety vent, And a current interrupt device (CID) collectively referred to as a substrate.

Generally, however, unlike a prismatic secondary battery, a cylindrical secondary battery is not provided with a separate device and a process for removing gas generated in the manufacturing process. Therefore, before the product is shipped, Malfunction of the current interruption element may be caused. In addition, the current interruption device is a one-time device and can not be repaired.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to provide a gas removing device for communicating or closing the inside and outside of a battery with a cap assembly, And a cylindrical secondary battery using the same.

According to an aspect of the present invention, there is provided a cylindrical secondary battery gas removing device comprising: a cylindrical outer casing having a first gas discharging hole and a second gas discharging hole formed on upper side walls thereof, And a third gas discharging hole and a fourth gas discharging hole formed in parallel with the first gas discharging hole and the second gas discharging hole, A gas inlet hole communicating with the gas hole and corresponding to the fifth gas outlet hole and the sixth gas outlet hole is formed in the upper side wall thereof and a gas inlet hole communicating with the gas hole is formed in the lower one side wall, An I-shaped gas discharge pipe including a head portion formed at an upper end of the body portion and a tail portion formed at a lower end of the body portion; And an elastic member fixed to the lower portion of the gas discharge pipe and elastically supporting the piston movement of the gas discharge pipe.

The top end of the inner rim is lower than the top of the rim so that the outer rim has a step with the outer rim.

Wherein the head portion has an outer diameter at least larger than an inner diameter of the inner softening material and smaller than an inner diameter of the outer softening material and is parallel to an upper end surface of the outer softening material, And is protruded downward from the lower end face of the outer casing.

In addition, an adhesive member for adhering the outer casing and the inner casing is further provided between the outer casing and the inner casing.

The fifth gas discharging hole and the third gas discharging hole are connected in parallel on the same line, and the sixth gas discharging hole and the fourth gas discharging hole are connected to each other on the same line And the gas inlet hole is opened.

The outer casing may be made of aluminum or an alloy containing aluminum. The inner casing may be made of silicone or polypropylene, and the gas outlet may be made of silicone or polypropylene.

Wherein the elastic member is a spring or rubber material.

According to another aspect of the present invention, there is provided a cylindrical rechargeable battery including: an electrode assembly; a can containing the electrode assembly; a cap up sealing the upper opening of the can to form a first through hole; A safety vent positioned under the secondary protection element and having a second through hole formed thereon, an insulator disposed under the safety vent, and a support member disposed at a lower portion of the insulator, A cap assembly including a cap down, and a gas removal device for the cylindrical rechargeable battery inserted into the first through hole and the second through hole.

In this case, the support part is configured to partially block the opening part of the cap-down and to have a stepped shape lower than the top surface of the cap-down part.

And the gas removing device is coupled to the first through hole through adhesion or welding, and the gas removing device is coupled to the second through hole through adhesion or welding.

Further, the gas removing device is seated and supported on the upper surface of the support.

According to the present invention, the gas generated inside the battery can be effectively removed.

Further, according to the present invention, it is possible to prevent the malfunction of the current interruption element due to the internal gas pressure before shipment of the product, and to prevent the product failure due to the malfunction of the current interruption element.

Also, the cylindrical secondary battery according to the embodiment of the present invention can be applied to a large-sized battery.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In the following embodiments, the same reference numerals are used for the same components, and redundant description of the same components is not possible.

FIG. 2 is a perspective view showing a combined state of the cylindrical rechargeable battery according to the embodiment of the present invention shown in FIG. 1, and FIG. 3 is a cross-sectional view of the cylindrical rechargeable battery according to the embodiment of FIG. Sectional view taken along line AA of FIG. 4 is a cross-sectional view taken along the line BB of FIG. 4. FIG. 6 is a cross-sectional view of a cylindrical secondary battery according to an embodiment of the present invention. FIG. Sectional view showing a shape in which the structure of the removing device is changed during the pressing.

1 to 3, a cylindrical rechargeable battery 100 according to an embodiment of the present invention includes an electrode assembly 110, a can 120 in which the electrode assembly 110 is accommodated, A cap assembly 130 sealing the opening and a gas removal device 140 configured to penetrate the cap assembly 130.

The electrode assembly 110 includes a positive electrode plate 111, a negative electrode plate 112 and a separator interposed between the two electrode plates 111 and 112 113). The electrode assembly 110 is formed by winding a positive electrode plate 111, a negative electrode plate 112 and a separator 113 in the form of a jelly roll. The center pin 118 is inserted into the hollow of the electrode assembly 110 formed by the winding process to prevent deformation of the electrode assembly 110. An upper insulating plate 116 is provided on the electrode assembly 110 to electrically insulate the electrode assembly 110 from the cap assembly 130.

The positive electrode plate 111 includes a positive electrode collector made of a foil of aluminum foil and a positive electrode active material layer coated on both surfaces of the positive electrode collector. The cathode active material layer may be composed of a layered compound containing lithium, a binder for improving the bonding force, and a conductive material for improving the conductivity. A positive electrode non-coating portion, which is a region where the positive electrode active material layer is not coated, is formed on both ends of the positive electrode collector on the positive electrode collector. The positive electrode tab 114 is fixed to the positive electrode uncoated portion and the end of the positive electrode tab 114 is extended to the upper end of the positive electrode collector and is connected to the cap assembly 130 through the hole 116a formed in the upper insulating plate 116 And is electrically connected.

The negative electrode plate 112 includes a negative electrode current collector made of a thin copper foil and an anode active material layer coated on both surfaces of the negative electrode current collector. The negative electrode active material layer may include hard carbon or graphite which contains carbon (C) and a binder which improves the bonding force of the particles. Also, a negative electrode non-coating portion, which is a region where the negative active material layer is not coated, is formed on both ends of the negative electrode collector. The negative electrode tab 115 is fixed to the negative electrode uncoated portion and the negative electrode tab 115 is connected to the lower plate 122 of the can 120 through the lower insulating plate 117. The positive electrode tab 114 and the negative electrode tab 115 may be formed of aluminum (Al), copper (Cu), nickel (Ni), or the like. Generally, the positive electrode tab 114 is formed of aluminum, The tab 115 is formed of nickel.

The separator 113 prevents a short between the positive electrode plate 111 and the negative electrode plate 112 and serves as a passage for lithium ions. Although the separator 113 is formed of polyethylene or polypropylene, the material of the separator 113 is not limited in the present invention.

The can 120 includes a side plate 121 as a cylinder having a predetermined diameter and a bottom plate 122 for sealing a lower portion of the side plate 121 so that a space for accommodating the electrode assembly 110 is formed. Here, the can 120 may be formed of a conductive metal material such as stainless steel. The upper portion of the can 120 is opened to be sealed after the electrode assembly 110 is inserted. In addition, a beading 123, which is recessed inwardly to support the cap assembly 130, is formed on the upper sidewall of the can 120. At the top of the can 120, a crimping 124 is formed which is bent in one direction to urge the cap assembly 130 from above. A lower insulating plate 117 is inserted into the upper portion of the lower plate 122 of the can 120 to insulate the lower portion of the electrode assembly 110 from the can 120. The lower insulating plate 117 may further include a hole for passing the negative electrode tab 115 therethrough. And the negative electrode tab 115 is passed through the hole to be electrically connected to the can 120. Therefore, the can 120 electrically connected to the negative electrode tab 115 serves as an electrode terminal.

The cap assembly 130 includes a cap 131, a secondary protection element 132 located under the cap 131, a safety vent located under the secondary protection element 132, An insulator 134 positioned below the safety vent 133, a cap down 135 located under the insulator 134, a sub-plate 135 located on a lower surface of the cap down 135, 136 and a gasket 137 surrounding them.

The cap 131 is a plate-like circular shape, and the upper projection 131a protrudes upward from the central portion. A plurality of through holes 131b for discharging the gas generated in the secondary battery 100 to the outside are formed on the side wall of the upper projection 131a. A first through hole 131c is formed in the upper end of the upper end protrusion 131a so that the gas removing device 140 can be inserted and penetrated. The cap 131 serves as a terminal for supplying a current generated in the cylindrical secondary battery 100 to the outside. The cap 131 may be made of a metal such as stainless steel.

The secondary protection element 132 is in the form of a circular ring having a constant width and is positioned below the cap 131. The secondary protection element 132 electrically connects the cap 131 and the safety vent 133. Further, the gas removing device 140 passes through the open area of the secondary protection element 132. On the other hand, when the temperature of the cylindrical secondary battery 100 rises, the secondary protection element 132 blocks current flow. The secondary protection element 132 may be formed of a PTC (positive temperature coefficient) element. The PTC device is formed of a resin, an element layer formed of carbon powder, and a conductive plate coupled to a bottom surface of the element layer. When the temperature of the PTC element increases, the resin of the resin layer expands, . As the PTC element, a ceramic element can be used. Meanwhile, the secondary protection element 132 may be omitted when the cap assembly 130 is constructed.

The safety vent 133 is formed in a circular plate shape and is positioned below the secondary protection element 132. The safety vent 133 has a lower protrusion 133a projecting downward at the center and a second through hole 133b at a position corresponding to the first through hole 131c of the cap 131 And provides a passage through which the degassing device 140 can be pierced. The safety vent 133 may be formed of a conductive metal. The bottom projecting portion 133a further includes a cross groove (not shown) with a center groove (not shown) and a center groove (not shown) as a reference. When the pressure in the interior of the can 120 rises above a threshold value, the lower end protrusion 133a expands upward in the safety vent 133 because gas is generated in the can 120. At this time, the center groove (not shown) and the cross groove (not shown) of the lower protrusion 133a are broken and separated from the sub plate 136 provided at the lower portion, and electrically disconnected to interrupt the flow of current. In addition, the gas that has been accumulated in the interior of the can 120 is discharged to the outside through the region where the bottom protrusion 133a is broken. That is, the safety vent 133 is one of safety devices for preventing the explosion due to the internal gas pressure of the cylindrical rechargeable battery 100 in advance.

The insulator 134 is ring-shaped and is formed between the safety vent 133 and the cap-down 135 to insulate the safety vent 133 from the cap-down 135. The insulator 134 provides a passage through which the degassing device 140 passing through the second through-hole 133b of the safety vent 133 can pass to the open area.

The cap-down 135 is formed in a plate-like circular shape, and is positioned below the insulator 134. The lower end projecting portion 133a of the safety vent 133 is inserted and passed through the center pipe through hole 135a and exposed to the lower side of the cap assembly 130. [ To provide a pathway for In addition, the cap down 135 has a plurality of openings 135c formed around the central pipe passage 135a. The plurality of openings 135c function to discharge the gas generated from the electrode assembly 110. The openings 135c corresponding to the second through holes 133b of the safety vent 133 are provided with support bars 135b are formed. The supporter 135b is formed in a plate shape and cuts off a part of the opening 135c and is formed in a stepped shape with the top of the cap down 135. [ The supporter 135b is structured to support the degassing device 140 from underneath.

And the sub-plate 136 is fixed in a state of blocking the central passage hole 135a of the cap-down 135. [ The sub-plate 136 is coupled to the lower protrusion 133a of the safety vent 133 at the same time. A positive electrode tab 114 drawn from the electrode assembly 110 is attached to the lower surface of the subplate 136 to electrically connect the subplate 136 and the positive electrode tab 114. Therefore, the sub-plate 136 is preferably made of a metallic material. Here, the safety vent 133 and the sub-plate 136 are coupled to each other, and at the same time, the cap-down 135 and the sub-plate 136 are coupled to each other. Accordingly, the safety vent 133, the cap-down 135, and the sub-plate 136 form a current interrupt device (CID) in an integrated state.

The gasket 137 includes a cap 131 that is seated on the inside, a secondary protection element 132 that is coupled to the lower part of the cap 131, and a safety vent 133 that is coupled to the lower part of the secondary protection element 132. , And the lower part is pressed. The gasket 137 may be formed of a resin material such as polyethylene terephthalate or polyethylene.

Meanwhile, the cylindrical rechargeable battery 100 according to the embodiment of the present invention includes a gas removing device 140 for discharging the gas generated inside the can 120 to the outside.

Hereinafter, a gas removing apparatus for a cylindrical rechargeable battery according to an embodiment of the present invention will be described in more detail.

FIG. 4 is a perspective view of a gas removing apparatus for a cylindrical rechargeable battery according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line B-B of FIG.

4 to 5, a gas removing device 140 for a cylindrical rechargeable battery according to an embodiment of the present invention includes a cylindrical outer casing 141, an inner casing 142, and an I-shaped gas discharge pipe 143 And an elastic member 147.

The outer envelope 141 is hollow and has a first gas vent 141a formed on the upper side wall thereof and a second gas vent 141b formed on the other side wall corresponding to the first gas vent 141a. . When the gas removing device 140 is coupled through the cap assembly 130, the first gas discharging hole 141a to the second gas discharging hole 141b are formed inside the electrode assembly 110 So that the gas is discharged to the outside. The outer casing 141 may be formed of an alloy containing aluminum or aluminum. The upper end face of the outer envelope 141 is formed to have the same horizontal plane as the upper end face of the cap 131 and the lower end face of the outer envelope 141 is formed to protrude into the lower space of the safety vent 133 desirable.

The inner rim 142 is hollow and is formed inside the rim 141. The lower end face of the inner casing member 142 is parallel to the lower end face of the outer casing member 141 and the upper end face of the inner casing member 142 is lower than the upper face of the outer casing member 141 . A third gas discharging hole 142a is formed on one upper side wall of the inner casing 142 and a fourth gas discharging hole 142b is formed on the other side wall corresponding to the third gas discharging hole 142a . At this time, the third gas discharge hole 142a and the fourth gas discharge hole 142b are formed in parallel to the first gas discharge hole 141a and the second gas discharge hole 141b, respectively. The inner rim member 142 may be formed of silicon or polypropylene having a small frictional force and excellent abrasion resistance. Bonding members (not shown) for bonding the outer and inner members 141 and 142 may be formed between the outer and inner members 141 and 142, respectively.

The gas discharge pipe 143 is formed in an I shape and includes a body portion 144, a head portion 145 and a tail portion 146.

The body portion 144 is inserted into the inner casing 142 and the gas passage 144a is formed in the axial direction at the central portion and the fifth gas exhausting chamber 144 is vertically connected to the gas passage 144a. And a sixth gas discharge hole 144c is formed in the other side wall corresponding to the fifth gas discharge hole 144b. In addition, a gas inflow hole 144d vertically connected to the gas hole 144a is formed in one lower side wall of the body portion 144. [ When the gas removing device 140 is formed to penetrate through the cap assembly 130, the gas inflow hole 144d is formed in a lower portion of the safety vent 133 so that gas generated in the can 120 can be introduced. As shown in Fig.

The head 145 is connected to the upper surface of the body 144 and is formed to be horizontal with the upper surface of the outer member 141. The outer diameter of the head 145 is at least larger than the inner diameter of the inner sleeve 142 and smaller than the inner diameter of the outer sleeve 141. This is because when the gas discharge pipe 143 is lowered under pressure, the lower end surface of the head 145 is brought into contact with the upper surface of the inner casing member 142 to which the gas discharge tube 143 is adhered and fixed, For example.

The tail portion 146 is formed to extend from the lower end surface of the body portion 144 and protrude downward from the lower end surface of the outer joint member 141. At this time, the outer diameter of the tail 146 is preferably the same as the outer diameter of the head 145. When the gas discharge pipe 143 is lifted to be restored to the original position after descending, the upper end face of the tail 146 contacts the lower end face of the inner casing member 142 to terminate the upward movement of the gas discharge pipe 143 . Thus, the elastic force of the elastic member 147 coupled to the lower portion of the gas discharge pipe 143 can prevent the gas discharge pipe 143 from bouncing to the outside.

As described above, the gas discharge pipe 143 composed of the body portion 144, the head portion 145 and the tail portion 146 can be formed of silicon or polypropylene having a small friction force and excellent abrasion resistance.

The upper surface of the elastic member 147 is attached and fixed to the lower portion of the gas discharge pipe 143, and more specifically, to the lower end surface of the tail portion 146. The lower end surface of the elastic member 147 is attached and fixed to the upper surface of the support 135b formed in the cap down 135. [ The elastic member 147 serves to elastically support the piston movement of the gas discharge pipe 143. The elastic member 147 may be formed of a metal material such as a spring or an elastic polymer material such as rubber.

Referring again to FIG. 3, the gas removal device 140 configured as described above is inserted through the cap assembly 130 and fastened. In detail, the gas removing device 140 passes through the first through hole 131c of the cap 131 and passes through the open area of the secondary protection device 132, Through hole 133b. Subsequently, the degassing device 140 passes through the open area of the insulator 134 and is seated in the support 135b of the cap down 135. At this time, in order to maintain the airtightness of the inside of the can 120, the portion of the second vent hole 133b of the safety vent 133, which is in contact with the gas removing device 140 that has passed through the vent hole 133, completely removes the gap through welding or adhesive . Further, in order to more firmly fix the gas removing apparatus 140, a portion where the first through hole 131c and the gas removing apparatus 140 are in contact with each other may be completely removed through welding or adhesive.

Next, the operation of the above-described cylindrical secondary cell degassing apparatus will be described in detail.

FIG. 6 is a cross-sectional view illustrating a shape of a gas removing device for a cylindrical rechargeable battery according to an embodiment of the present invention when the pressing structure is changed.

Generally, to determine the abnormality of the battery, the battery is subjected to a formation process such as charging, discharging and aging in order to stabilize the battery structure before shipment of the product. At this time, gas may be generated inside the battery by the above-described chemical conversion process. In the present invention, it is possible to remove the gas generated by the chemical conversion process using the gas removal device 140 as described above .

6, when the upper portion of the gas discharge pipe 143 of the gas removing unit 140 is pressed to remove the gas inside the cylindrical rechargeable battery 100, the gas discharge pipe 143 is lowered, The third gas discharging hole 142a and the first gas discharging hole 141a are connected in parallel to each other and the sixth gas discharging hole 144c and the fourth gas discharging hole 142b and the third gas discharging hole 142b are connected in parallel, And the second gas discharge holes 141b are connected in parallel on the same line. The gas inflow hole 144d that is closed by the inner circumferential member 142 is opened to the lower end of the inner circumferential member 142. The gas inflow hole 144d is opened under the safety vent 133 to be. Therefore, the gas generated in the cylindrical secondary battery 100 flows through the gas inlet hole 144d, the gas hole 144a, the fifth gas outlet hole 144b, the third gas outlet hole 142a And the gas exhausted into the cap assembly 130 passes through the plurality of through holes 131b formed in the cap 131, As shown in FIG. In addition, the gas generated in the inside of the cell is discharged through the gas inflow hole 144d, the gas passage 144a, the sixth gas discharge hole 144c, the fourth gas discharge hole 142b, And the gas discharged into the cap assembly 130 is discharged to the outside through a plurality of through holes 131b formed in the cap 131. [ . When the applied pressure is removed, the elastic member 147 is resiliently restored to the initial thickness h1 to be elastically restored to the upper protrusion (h1) of the cap 131 131a and the gas remover 140 are made to coincide with each other.

As described above, when the gas removing device 140 according to the present invention is applied to the cylindrical rechargeable battery 100, it is possible to effectively remove the gas generated in the cylindrical rechargeable battery 100, It is possible to prevent the current cutoff device from malfunctioning due to the gas pressure generated inside the battery 100. [

In addition, the cylindrical secondary battery according to the embodiment of the present invention can be applied to a large-sized battery such as a power source of a power transmission mechanism or a hybrid electric vehicle in order to maximize work efficiency and efficiency for manufacturing.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be self-evident.

1 is an exploded perspective view of a cylindrical secondary battery according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a combined state of the cylindrical secondary battery according to the embodiment of the present invention shown in FIG. 1; FIG.

3 is a sectional view taken along the line A-A in Fig.

4 is a perspective view of a gas removing apparatus for a cylindrical rechargeable battery according to an embodiment of the present invention.

5 is a cross-sectional view taken along the line B-B in Fig.

FIG. 6 is a cross-sectional view illustrating a shape of a gas removing device for a cylindrical rechargeable battery according to an embodiment of the present invention when the pressing structure is changed. FIG.

Description of the Related Art

100: Cylindrical secondary battery 110: Electrode assembly

111: Positive electrode plate 112: Negative electrode plate

113: separator 114: positive electrode tab

115: negative electrode tab 116: upper insulating plate

116a: hole 117: lower insulating plate

118: center pin 120: can

121: side plate 122: lower plate

123: beading portion 124: crimping portion

130: cap assembly 131: cap

131a: upper protrusion 131b: through hole

131c: first through hole 132: secondary protection element

133: safety vent 133a: lower protrusion

133b: second through hole 134: insulator

135: cap-down 135a: central pipe passage

135b: Supporting base 135c:

136: Subplate 137: Gasket

140: Gas removing device 141:

141a: first gas discharge hole 141b: second gas discharge hole

142: Inner series 142a: Third gas discharge hole

142b: fourth gas discharge hole 143: gas discharge pipe

144: body portion 144a: gas cylinder

144b: fifth gas discharge hole 144c: sixth gas discharge hole

144d: gas inflow hole 145: head portion

146: tail portion 147: elastic member

Claims (15)

And a first gas discharge hole and a second gas discharge hole, And a third gas discharging hole and a fourth gas discharging hole which are located inside the outer casing and which are formed in parallel with the first gas discharging hole and the second gas discharging hole, A fifth gas discharge hole and a sixth gas discharge hole communicating with the gas discharge holes are formed in an upper end side wall thereof and a gas discharge hole communicating with the gas discharge hole is formed in the lower one side wall, An I-shaped gas discharge pipe including a body portion having a gas inflow hole formed therein, a head portion formed at an upper end of the body portion, and a tail portion formed at a lower end of the body portion, An elastic member which is fixed to the lower portion of the gas discharge pipe and elastically supports the piston movement of the gas discharge pipe, And a gas supply unit for supplying the gas to the cylindrical secondary battery. The method according to claim 1, And the upper end surface of the inner casing is formed lower than the upper surface of the outer casing so as to have a step with the outer casing. The method according to claim 1, Wherein the head portion has an outer diameter at least larger than an inner diameter of the inner softening material and smaller than an inner diameter of the outer softening material and is parallel to an upper end surface of the outer softening material. The method according to claim 1, Wherein the tail portion has an outer diameter equal to an outer diameter of the head portion and protrudes downward from a lower end surface of the outer casing. The method according to claim 1, And an adhesive member for adhering the outer casing and the inner casing to each other between the outer casing and the inner casing. The method according to claim 1, Wherein the first gas discharge hole and the third gas discharge hole are connected in parallel on a same line, the sixth gas discharge hole and the fourth gas discharge hole are connected in parallel and in parallel, And the gas inlet hole is opened. The method according to claim 1, Wherein the outer casing is made of aluminum or an alloy including aluminum. The method according to claim 1, Wherein the inner casing is made of silicone or polypropylene. The method according to claim 1, Wherein the gas discharge pipe is made of silicon or polypropylene. The method according to claim 1, Wherein the elastic member is a spring or rubber material. Electrode assembly The electrode assembly A safety vent sealing the upper opening of the can and forming a first through hole, a secondary protection element located in the lower portion of the cap, a safety vent located under the secondary protection element and having a second through hole, A cap assembly including an insulator located under the vent, and a cap down positioned below the insulator and having a support on one side; The gas removing device according to any one of claims 1 to 10, inserted into the first through hole and the second through hole, And a second electrode connected to the second electrode. 12. The method of claim 11, Wherein the support block is configured to partially block the opening portion of the cap down and to have a stepped shape lower than a top surface of the cap down. 12. The method of claim 11, And the gas removing device is bonded to the first through hole by adhesion or welding. 12. The method of claim 11, And the gas removing device is coupled to the second through-hole through adhesion or welding. 12. The method of claim 11, And the gas removing device is seated and supported on the upper surface of the support.

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