KR20090095334A - Apparatus of Removing Gas and Cylinder type Secondary Battery using the same - Google Patents

Abstract

A device for removing gas for a cylindrical secondary battery, and a cylindrical secondary battery using it are provided to remove the gas generated inside a battery effectively and to prevent the malfunction of a current interrupt device due to the internal gas pressure. A device(140) for removing gas for a cylindrical secondary battery comprises a cylindrical outer circumference material(141) where a first gas discharge hole(141a) and a second gas discharge hole(141b) facing each other to the side wall are formed; a cylindrical inner circumference material(142) which is located inside the outer circumference material and has a third gas discharge hole(142a) and a fourth gas discharge hole(142b); an I-shaped gas discharge pipe(143) which is inserted inside inner circumference material and has a body part(144), a head part(145), and a tail part(146); and an elastic member(147) which is fixed to the lower part of the gas discharge pipe and elastically supports the piston motion of the gas discharge pipe.

Description

Apparatus of Removing Gas and Cylinder type Secondary Battery using the same}

The present invention relates to a cylindrical secondary battery, and more particularly, by configuring the cap assembly with a gas removal device that communicates or closes the inside and outside of the battery according to the pressure applied, the gas generated inside the battery is effectively discharged to the outside of the battery. It relates to a gas removing device and a cylindrical secondary battery using the same.

In general, a cylindrical secondary battery has a cylindrical electrode assembly, a cylindrical can housing the electrode assembly and the electrolyte, and a cap coupled to an upper opening of the can to seal the can and allow a current generated in the electrode assembly to flow to an external device. An assembly.

Looking at the structure and manufacturing process of the cylindrical secondary battery schematically, the electrode assembly is formed by winding (winding) in the shape of a jelly roll (jelly roll) in a state arranged in the order of a positive electrode plate, a separator, a negative electrode plate. A cylindrical center pin is inserted into the center portion of the electrode assembly. The center pin prevents deformation of the electrode assembly and discharges gas inside the battery generated due to heat generation to the upper part of the battery. In addition, upper and lower insulating plates are formed on the upper and lower electrode assemblies. The upper and lower insulating plates serve to prevent the electrode assembly from contacting the cap assembly or the cylindrical can.

The electrode assembly is housed in a cylindrical can, and a beading is formed on the top sidewall of the can to prevent flow of the electrode assembly into the can. In addition, a gasket is installed on the inner wall of the upper opening of the can, and a cap assembly is installed inside the gasket to close the upper opening of the can.

The cap assembly is a safety vent that is deformed when the internal pressure changes due to overcharging, and a circuit in which a current is cut off by the deformation of the safety vent, in order to prevent an explosion phenomenon when the cylindrical secondary battery is overcharged. It includes a current interrupt device (CID) that collectively refers to a substrate.

However, in general, cylindrical secondary batteries, unlike rectangular secondary batteries, do not have a separate device and process for removing gas generated during the manufacturing process.Therefore, the current blocking device is increased due to an internal pressure increase due to gas generation before the product is shipped. May cause a malfunction of the current interrupting element. In addition, since the current interrupting device is a one-time device, the recovery is impossible, which is classified as a product failure before shipment.

The technical problem of the present invention is to solve the above problems by configuring the cap assembly with a gas removal device for communicating or closing the inside and outside of the battery in accordance with the pressure applied to effectively discharge the gas generated inside the battery to the outside of the battery The present invention provides a gas removal device and a cylindrical secondary battery using the same.

Gas removal device for a cylindrical secondary battery according to the present invention for achieving the above technical problem is a cylindrical outer fuel member and the first gas discharge hole and the second gas discharge hole corresponding to each other formed on the upper side wall, and located inside the outer fuel material A cylindrical internal flame retardant comprising a third gas discharge hole and a fourth gas discharge hole formed in parallel with each other in the same line as the first gas discharge hole and the second gas discharge hole, and inserted into the internal flame retardant material, A gas through hole is formed in the center in the axial direction, and the upper sidewall is formed with a fifth gas discharge hole and a sixth gas discharge hole communicating with the gas through hole and corresponding to each other, and a lower part side wall with a gas inlet hole communicating with the gas through hole. And a gas discharge pipe having an 'I' shape including a head configured at the top of the body and a tail configured at the bottom of the body, and It is fixed to the lower portion of the gas discharge pipe, and includes an elastic member for elastically supporting the piston movement of the gas discharge pipe.

Here, the inner flame retardant is characterized in that the upper surface is formed lower than the upper surface of the outer flame retardant to have a step with the outer flame retardant.

The head portion is characterized in that the outer diameter is at least larger than the inner diameter of the inner flame retardant material and smaller than the inner diameter of the outer flame retardant material, and is horizontal to the top surface of the outer flame retardant material, the tail portion is the same as the outer diameter of the head portion and the It is characterized by protruding lower than the lower surface of the outer material.

In addition, an adhesive member for adhering the outer flame retardant and the inner flame retardant is further included between the outer flame retardant and the inner flame retardant.

On the other hand, the gas discharge pipe is lowered when pressurized from the upper side so that the fifth gas discharge hole and the third gas discharge hole are connected in parallel to the same line, the sixth gas discharge hole and the fourth gas discharge hole is connected in parallel to the same line And, the gas inlet is characterized in that the opening.

The outer flame retardant is characterized in that the aluminum or an alloy containing aluminum, the inner flame retardant is characterized in that the silicon or polypropylene, the gas discharge pipe is characterized in that the silicon or polypropylene.

The elastic member is characterized in that the spring or rubber material.

In addition, the cylindrical secondary battery according to the present invention for achieving the above technical problem is an electrode assembly, a can accommodated in the electrode assembly, a cap up sealing the upper opening of the can, the first through-hole is formed, and the lower cap up A secondary protective element positioned at the lower portion, a safety vent positioned under the secondary protective element, and having a second through hole formed therein, an insulator positioned under the safety vent, and positioned under the insulator, and having a support formed at one side thereof. And a cap assembly including a cap down and the gas removal device for the cylindrical secondary battery inserted into the first through hole and the second through hole.

Here, the support may block a portion of the opening of the cap down, characterized in that formed in the stepped form lower than the top surface of the cap down.

The degassing device is characterized in that coupled to the first through-hole by bonding or welding, the degassing device is characterized in that coupled to the second through-hole by bonding or welding.

In addition, the gas removal device is characterized in that seated and supported on the top surface of the support.

According to the present invention, it is possible to effectively remove the gas generated inside the battery.

In addition, according to the present invention, it is possible to prevent the malfunction of the current blocking device due to the internal gas pressure before shipping the product, it is possible to prevent the product defects due to the malfunction of the current blocking device.

In addition, the cylindrical secondary battery according to the embodiment of the present invention can be applied to a large battery.

Hereinafter, exemplary embodiments of 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 overlapping descriptions of the same components will not be possible.

1 is an exploded perspective view of a cylindrical secondary battery according to an embodiment of the present invention, Figure 2 is a perspective view showing a combined state of a cylindrical secondary battery according to an embodiment of the present invention shown in Figure 1, Figure 3 is Figure 2 Sectional view taken along line AA. In addition, Figure 4 is a perspective view of a gas removal device for a cylindrical secondary battery according to an embodiment of the present invention, Figure 5 is a cross-sectional view taken along the line BB of Figure 4, Figure 6 is a cylindrical secondary battery gas according to an embodiment of the present invention It is sectional drawing which shows the shape changed in the structure of pressurization of a removal apparatus.

1 to 3, the cylindrical secondary battery 100 according to the embodiment of the present invention includes an electrode assembly 110, a can 120 in which the electrode assembly 110 is accommodated, and an upper end of the can 120. Cap assembly 130 for sealing the opening and the gas removal device 140 is formed through 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 as a component. The electrode assembly 110 is formed by winding the positive electrode plate 111, the negative electrode plate 112, and the separator 113 in the form of a jelly roll. In addition, the center pin 118 is inserted into the hollow of the electrode assembly 110 formed by the winding process, thereby preventing deformation of the electrode assembly 110. In addition, 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 current collector made of a thin aluminum (Al) foil, and a positive electrode active material layer coated on both surfaces of the positive electrode current collector. The cathode active material layer may be formed of a layered compound containing lithium, a binder to improve binding strength, and a conductive material to improve conductivity. In addition, 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 current collector. The positive electrode tab 114 is fixed to the positive electrode uncoated portion, and an end portion of the positive electrode tab 114 is drawn out over the upper end of the positive electrode current collector, and is formed in the cap assembly 130 through a hole 116a formed in the upper insulating plate 116. Electrically connected.

The negative electrode plate 112 includes a negative electrode current collector made of a thin copper (Cu) foil, and a negative electrode active material layer coated on both surfaces of the negative electrode current collector. The negative electrode active material layer may include carbon (C) and generally include hard carbon or graphite and a binder for improving bonding strength of particles. In addition, a negative electrode non-coating portion, which is a region on which the negative electrode active material layer is not coated, is formed on both ends of the negative electrode current collector. The negative electrode tab 115 is fixed to the negative electrode uncoated portion, and the negative electrode tab 115 penetrates through the lower insulating plate 117 to be in contact with the bottom plate 122 of the can 120. Here, the positive electrode tab 114 and the negative electrode tab 115 may be formed of aluminum (Al), copper (Cu), nickel (Ni), etc. In general, the positive electrode tab 114 is formed of aluminum, and the negative electrode 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 movement passage of lithium ions. The separator 113 is formed of polyethylene or polypropylene, but the material is not limited thereto.

The can 120 includes a side plate 121 which is a cylindrical body having a predetermined diameter to form a space in which the electrode assembly 110 is accommodated, and a bottom plate 122 that seals a lower portion of the side plate 121. Here, the can 120 may be formed of a conductive metal material such as stainless steel. The top of the can 120 is open to be sealed after the electrode assembly 110 is inserted. In addition, an indented beading portion 123 is formed in the upper sidewall of the can 120 to support the cap assembly 130. The top of the can 120 is formed with a crimping portion 124 that is bent to one side so as to press the cap assembly 130 from the top. In addition, a lower insulating plate 117 is inserted above 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 through which the negative electrode tab 115 passes. The negative electrode tab 115 passes through the hole and is electrically connected to the can 120. Accordingly, the can 120 itself electrically connected to the negative electrode tab 115 serves as an electrode terminal.

The cap assembly 130 may include a cap up 131, a secondary protective element 132 disposed under the cap up 131, and a safety vent positioned under the secondary protective element 132 ( 133, an insulator 134 positioned under the safety vent 133, a cap down 135 positioned under the insulator 134, and a subplate positioned under the cap down 135. 136 and gaskets 137 that surround them.

The cap-up 131 is a plate-shaped circular, the upper protrusion 131a is configured in the form protruding upward from the central portion. In addition, a plurality of through holes 131b are formed on the sidewall of the upper protrusion 131a to discharge the gas generated in the secondary battery 100 to the outside. A first through hole 131c is formed at one end of the upper end protrusion 131a to allow the gas removal device 140 to be inserted therethrough. The cap up 131 serves as a terminal for energizing the current generated in the cylindrical secondary battery 100 to the outside. In addition, the cap up 131 may be formed of a metal material such as stainless steel.

The secondary protection element 132 has a circular ring shape having a predetermined width and is located below the cap up 131. The secondary protection element 132 electrically connects the cap up 131 and the safety vent 133. In addition, the gas removal device 140 passes through the open area of the secondary protection element 132. On the other hand, the secondary protection element 132 blocks the flow of current when the temperature of the cylindrical secondary battery 100 rises. The secondary protection element 132 may be formed of a positive temperature coefficient (PTC) element. The PTC element is formed of an element layer formed of a resin and a carbon powder, and a conductive plate coupled to the upper and lower surfaces of the element layer. When the temperature of the PTC element rises, the resin of the resin layer expands, thereby disconnecting the carbon powder to cut off the current. Will be blocked. As the PTC device, a ceramic device may be used. On the other hand, the secondary protection element 132 may be omitted if necessary when configuring the cap assembly 130.

The safety vent 133 is formed in a circular plate shape and is located below the secondary protective element 132. The safety vent 133 has a lower protrusion 133a protruding downward in the center thereof, and a second through hole 133b is formed at a position corresponding to the first through hole 131c of the cap up 131. It provides a passage through which the degassing device 140 can pass. The safety vent 133 may be formed of a conductive metal material. On the other hand, the lower protrusion 133a further includes a cross groove (not shown) based on the center groove (not shown) and the center groove (not shown) in the center. When the gas is generated in the can 120 and the pressure inside the can 120 rises above the threshold, the safety vent 133 expands in the upper direction. At this time, the periphery of the center groove (not shown) and the cross groove (not shown) of the lower protrusion 133a are broken and separated from the subplate 136 installed at the bottom and electrically disconnected to block the flow of current. In addition, a region opened due to breakage of the lower protrusion 133a and designed to have a gas discharged to the outside of the can 120. That is, the safety vent 133 is one of safety devices for preventing the explosion due to the internal gas pressure of the cylindrical secondary battery 100 in advance.

The insulator 134 has a ring shape and is formed between the safety vent 133 and the cap down 135 to insulate the safety vent 133 and the cap down 135. The insulator 134 provides a passage to allow the gas removal device 140 passing through the second through hole 133b of the safety vent 133 to pass through the open area.

The cap down 135 is formed in a circular plate shape and is positioned below the insulator 134. In addition, a central through hole 135a is formed at the center of the cap down 135, and the central through hole 135a is inserted into and passed through the lower protrusion 133a of the safety vent 133 to be exposed to the lower side of the cap assembly 130. It provides a pathway to help. In addition, the cap down 135 has a plurality of openings 135c formed around the central through hole 135a. The plurality of openings 135c may function to discharge the gas generated from the electrode assembly 110. Among them, the support 135 may be formed in the opening 135c corresponding to the second through hole 133b of the safety vent 133. 135b) is formed. The support 135b has a plate shape and blocks a part of the opening 135c and is formed in a stepped shape with an upper portion of the cap down 135. The support 135b is formed in a structure to support the gas removal apparatus 140 from the bottom.

The subplate 136 is fixed in a state of blocking the central through hole 135a of the cap down 135. The subplate 136 is simultaneously coupled to the lower protrusion 133a of the safety vent 133. A positive electrode tab 114 drawn from the electrode assembly 110 is attached to the lower surface of the subplate 136 so that the subplate 136 and the positive electrode tab 114 are electrically connected to each other. Therefore, the subplate 136 is preferably formed of a metallic material. The safety vent 133 and the subplate 136 are coupled to each other, and at the same time, the capdown 135 and the subplate 136 are coupled to each other. Accordingly, the safety vent 133, the cap down 135, and the subplate 136 form a current interrupt device (CID) in an integrated state.

The gasket 137 covers an outer portion of a cap up 131 seated on an inner side, a secondary protective element 132 coupled to a lower portion of the cap up 131, and a safety vent 133 coupled to a lower portion of the secondary protective element 132. It is configured in the form of pressing on the lower part. The gasket 137 may be formed of a resin material such as polyethyleneterephthalate or polyethylene.

On the other hand, the cylindrical secondary battery 100 according to the embodiment of the present invention includes a gas removal device 140 for discharging the gas generated in the can 120 to the outside.

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

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

4 to 5, the gas removal apparatus 140 for a cylindrical secondary battery according to an exemplary embodiment of the present invention has a cylindrical outer flame member 141, an inner flame member 142, and a gas discharge pipe 143 having an 'I' shape. And an elastic member 147.

The outer flame retardant 141 is a hollow cylindrical shape, the first gas discharge hole (141a) is formed on one side upper wall, the second gas discharge hole (141b) on the other side wall corresponding to the first gas discharge hole (141a) Is formed. Here, when the gas removal device 140 is fastened through the cap assembly 130, the first gas discharge hole 141a to the second gas discharge hole 141b are generated inside the electrode assembly 110. It is preferable to form the gas to be located in the upper space of the safety vent 133 so that the gas can be discharged to the outside. The outer flame retardant 141 may be formed of aluminum or an alloy including aluminum. In addition, the upper end surface of the outer member 141 is formed to have the same horizontal surface as the upper surface of the cap-up 131, the lower end surface of the outer member 141 is formed to protrude into the lower space of the safety vent 133. desirable.

The inner flame retardant 142 is a hollow cylindrical shape, is formed inside the outer flame retardant 141. The bottom surface of the flame retardant material 142 is horizontal with the bottom surface of the flame retardant material 141, and the top surface of the flame retardant material 142 is lower than the top surface of the flame retardant material 141 so as to have a step with the flame retardant material 141. Is formed. In addition, a third gas discharge hole 142a is formed in one upper wall of the inner flame retardant 142, and a fourth gas discharge hole 142b is formed in the other side wall corresponding to the third gas discharge hole 142a. . At this time, the third gas discharge hole 142a and the fourth gas discharge hole 142b are formed in parallel with the first gas discharge hole 141a and the second gas discharge hole 141b, respectively. The flame retardant 142 may be formed of silicon or polypropylene having low friction and excellent wear resistance. On the other hand, an adhesive member (not shown) may be formed between the outer flame retardant 141 and the flame retardant 142.

The gas discharge pipe 143 has an 'I' shape, the body 144, the head 145 and the tail 146 is composed of.

The body portion 144 is inserted into the inner flame retardant 142, the gas cylinder hole 144a is formed in the axial direction in the center, the upper one side wall is connected to the fifth gas discharge hole 144a vertically 144b is formed, and the sixth gas discharge hole 144c is formed in the other side wall corresponding to the fifth gas discharge hole 144b. In addition, a gas inlet hole 144d connected to the gas cylinder hole 144a is formed at one lower wall of the body 144. Here, when the gas removal device 140 is configured to penetrate through the cap assembly 130, the gas inlet hole 144d is a lower portion of the safety vent 133 so that gas generated in the can 120 can be introduced therein. It is preferable to form so as to be located.

The head portion 145 is formed to be connected to the top surface of the body portion 144, and is formed to be horizontal to the top surface of the outer margin material 141. In addition, the outer diameter of the head 145 is formed at least larger than the inner diameter of the inner flame retardant 142, and smaller than the inner diameter of the outer flame retardant 141. When the gas discharge pipe 143 is lowered under pressure from the top, the lower surface of the head 145 is in contact with the upper surface of the inner flame retardant 142 is bonded and fixed to stop the falling of the gas discharge pipe 143. To do this.

The tail portion 146 is formed to be connected to the bottom surface of the body portion 144, and is formed to protrude in the lower direction than the bottom surface of the outer duct 141. At this time, the outer diameter of the tail 146 is preferably formed to be the same as the outer diameter of the head 145. When the gas discharge pipe 143 is raised to be restored to its original position after the lowering, the upper surface of the tail 146 is in contact with the lower surface of the internal combustion material 142 to terminate the upward movement of the gas discharge pipe 143. To do so. As a result, the gas discharge pipe 143 may be prevented from being thrown out by the elastic force of the elastic member 147 coupled to the lower portion of the gas discharge pipe 143.

As described above, the gas discharge pipe 143 composed of the body 144, the head 145 and the tail 146 may be formed of silicon or polypropylene having low friction and excellent wear resistance.

The upper surface of the elastic member 147 is attached and fixed to the lower portion of the gas discharge pipe 143, more specifically the lower surface of the tail 146. In addition, the bottom surface of the elastic member 147 is attached and fixed to the top 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, and may be formed of an elastic polymer material such as rubber.

Referring back to FIG. 3, the gas removal device 140 configured as described above is fastened through the cap assembly 130. In more detail, the gas removing device 140 passes through the first through hole 131c of the cap up 131, passes through the open area of the secondary protection element 132, and removes the first safety vent 133. 2 penetrates the through-hole 133b. Subsequently, the gas removal device 140 passes through the open area of the insulator 134 and is seated on the support 135b of the capdown 135. At this time, the part where the second through-hole 133b of the safety vent 133 is in contact with the gas removal device 140 that has passed through is completely removed by welding or adhesive to maintain the airtightness in the can 120. Can be combined. In addition, the portion where the first through hole 131c and the gas removing device 140 are in contact with each other may be completely removed by welding or adhesive to fix the gas removing device 140 more firmly.

Next, the operation of the gas removal device for a cylindrical secondary battery as described above will be described in detail.

6 is a cross-sectional view showing a changed shape of the cylindrical secondary battery gas removal apparatus according to an embodiment of the present invention when pressurized.

In general, in order to stabilize the battery structure before shipment of the product, whether the battery is abnormal is determined through a formation process such as charging, discharging, and aging. At this time, the gas may be generated in the battery by the chemical conversion process as described above, in the present invention, it is possible to remove the gas generated by the chemical conversion process before shipping the product using the gas removal device 140 as described above. .

Referring to FIG. 6, when the upper portion of the gas discharge pipe 143 of the gas removal device 140 is pressurized to remove the gas inside the cylindrical secondary battery 100, the gas discharge pipe 143 descends to discharge the fifth gas. The ball 144b and the third gas discharge hole 142a and the first gas discharge hole 141a are connected side by side on the same line, and at the same time, the sixth gas discharge hole 144c and the fourth gas discharge hole 142b and The second gas discharge holes 141b are connected side by side on the same line. In addition, the gas inlet hole 144d existing in the closed form by the flame retardant 142 is opened to the lower end of the flame retardant 142, and the gas inlet hole 144d is opened in the lower part of the safety vent 133. to be. Therefore, the gas generated in the cylindrical secondary battery 100 is the gas inlet hole (144d), the gas through hole (144a), the fifth gas discharge hole (144b), and the third gas discharge hole (142a) ) And the first gas discharge hole 141a are sequentially discharged into the cap assembly 130, and the gas discharged into the cap assembly 130 is formed in the cap up 131. Can be discharged to the outside through. In addition, the gas generated inside the battery is the gas inlet hole (144d), the gas through hole (144a), the sixth gas discharge hole (144c), the fourth gas discharge hole (142b), and the first 2 passes through the gas discharge hole (141b) in order to be discharged into the cap assembly 130, the gas discharged into the cap assembly 130 is discharged to the outside through a plurality of through holes (131b) formed in the cap up (131) Can be. Meanwhile, the elastic member 147 is contracted from the initial thickness h1 to the deformation thickness h2 by pressing. When the applied pressure is removed, the elastic member 147 is elastically restored to the initial thickness h1, and the upper protrusion part of the cap up 131 ( 131a and the upper height of the gas removal device 140 to match.

As described above, when the gas removal device 140 according to the present invention is applied to the cylindrical secondary battery 100, it is possible to effectively remove the gas generated in the cylindrical secondary battery 100, before the product is shipped, the cylindrical secondary. It is possible to prevent the current blocking device from malfunctioning due to 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 large batteries such as power source of the power mechanism or hybrid electric vehicle (maximum) in order to maximize the workability and effect for manufacturing.

The present invention described above is not limited to the above-described embodiments and drawings, and it can be variously changed within the scope without departing from the technical idea of the present invention for those skilled in the art. Will be self explanatory.

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

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

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a perspective view of a gas removal device for a cylindrical secondary battery according to an embodiment of the present invention.

5 is a cross-sectional view taken along line B-B of FIG. 4.

Figure 6 is a cross-sectional view showing the shape of the structure changed when the pressure of the gas removal apparatus for a cylindrical secondary battery according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

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 insulation plate

118: center pin 120: can

121: side plate 122: bottom plate

123: beading portion 124: crimping portion

130: cap assembly 131: cap up

131a: top protrusion 131b: through hole

131c: first through hole 132: secondary protective element

133: safety vent 133a: lower projection

133b: second through hole 134: insulator

135: cap down 135a: through the center

135b: support 135c: opening

136: subplate 137: gasket

140: gas removal device 141: external combustion material

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

142: flame retardant 142a: third gas discharge hole

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

144: body portion 144a: gas cylinder hole

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

144d: gas inlet 145: head

146: tail 147: elastic member

Claims (15)

Cylindrical outer lead material having a first gas discharge hole and a second gas discharge hole corresponding to each other on the upper sidewall A cylindrical flame retardant positioned inside the outer flame retardant and including a third gas discharge hole and a fourth gas discharge hole formed in parallel with the first gas discharge hole and the second gas discharge hole, respectively. Is inserted into the inner flame retardant material, a gas through hole is formed in the center in the axial direction, the upper side wall is formed in communication with the gas through hole and corresponding to each other and the fifth gas discharge hole and the sixth gas discharge hole is formed, the lower one side wall is in communication with the gas through hole Gas discharge pipe of the 'I' shape including a body portion is formed gas inlet hole, the head portion formed on the top of the body portion, the tail portion formed on the bottom of the body portion and An elastic member fixed to the lower portion of the gas discharge pipe, the elastic member for elastically supporting the piston movement of the gas discharge pipe Gas removal device for a cylindrical secondary battery comprising a. The method of claim 1, The flame retardant is a gas removal device for a cylindrical secondary battery, characterized in that the top surface is formed lower than the top surface of the outer material to have a step with the outer material. The method of claim 1, The head portion is a gas removal device for a cylindrical secondary battery, characterized in that the outer diameter is at least larger than the inner diameter of the inner flame retardant material and smaller than the inner diameter of the outer flame retardant material, and is parallel to the top surface of the outer flame retardant material. The method of claim 1, The tail portion of the cylindrical secondary battery gas removal device, characterized in that the outer diameter is the same as the outer diameter of the head portion, and protrudes lower than the lower surface of the outer material. The method of claim 1, Gas removal device for a cylindrical secondary battery, characterized in that further comprising an adhesive member for adhering the outer flame retardant and the inner flame retardant between the outer flame retardant and the inner flame retardant. The method of claim 1, The gas discharge pipe is lowered when pressurized from the upper side so that the fifth gas discharge hole and the third gas discharge hole are connected in parallel with each other, and the sixth gas discharge hole and the fourth gas discharge hole are connected in parallel with each other. Gas removal device for a cylindrical secondary battery, characterized in that the gas inlet opening is opened. The method of claim 1, The outer flame retardant is a gas removal device for a cylindrical secondary battery, characterized in that the aluminum or an alloy containing aluminum. The method of claim 1, The flame retardant is a gas removal device for a cylindrical secondary battery, characterized in that the silicon or polypropylene. The method of claim 1, The gas discharge pipe is a gas removal device for a cylindrical secondary battery, characterized in that the silicon or polypropylene. The method of claim 1, The elastic member is a gas removal device for a cylindrical secondary battery, characterized in that the spring or rubber material. Electrode Assembly Cans in which the electrode assembly is received A cap up sealing the upper opening of the can and having a first through hole formed therein, a secondary protective element positioned under the cap up, a safety vent positioned below the secondary protective element and having a second through hole formed therein; A cap assembly including an insulator positioned under the vent, a cap down positioned under the insulator, and a support formed on one side thereof; A gas removal device inserted into the first through hole and the second through hole and having the configuration of claims 1 to 10. Cylindrical secondary battery comprising a. The method of claim 11, The support is a cylindrical secondary battery, characterized in that blocking the opening part of the cap down, is formed in a stepped form lower than the top surface of the cap down. The method of claim 11, The gas removal device is a cylindrical secondary battery, characterized in that coupled to the first through-hole by bonding or welding. The method of claim 11, The gas removal device is a cylindrical secondary battery, characterized in that coupled to the second through-hole by bonding or welding. The method of claim 11, The gas removal device is a cylindrical secondary battery, characterized in that seated and supported on the top surface of the support.

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