Gas vent guide block and pouch-type secondary battery including same

Abstract

The gas vent induction block according to the present invention comprises a block body having a slit arranged so that a cell terrace of a pouch-type secondary battery can be fitted to a predetermined depth, a pocket portion arranged inside the block body and having a shape with a wider space than the slit so that a portion of the cell terrace can be accommodated, and an exhaust pipe having a tubular shape and extending from the pocket portion to the outer surface of the block body, wherein the exhaust pipe is characterized in that it has a needle portion that protrudes sharply toward the internal space of the pocket portion so that the cell terrace can be pierced when the cell terrace expands to a certain volume or more in the pocket portion.

Description

[Technical field]

[0001] The present invention relates to a pouch-type secondary battery and a device for discharging internal gas in a specific direction when the pouch-type secondary battery swells.

[0002] This application claims priority to Korean Patent Application No. 10-2021-0142201, filed on October 22, 2021, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] In general, secondary batteries refer to batteries that can be charged and discharged, unlike primary batteries that cannot be charged, and are widely used in electronic devices such as mobile phones, notebook computers, and camcorders, as well as electric vehicles, etc. In particular, lithium secondary batteries have a larger capacity and a higher energy density per unit weight than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for electronic equipment, and thus their use is rapidly increasing.

[0004] When a secondary battery is overcharged or when a sudden change occurs in the electrical environment, the electrolyte may decompose at the positive electrode and lithium metal may precipitate at the negative electrode, which may cause a decrease in the performance of the secondary battery. In addition, a secondary battery uses a solvent such as ethylene carbonate or propylene carbonate as an electrolyte, but such a solvent may decompose at high temperatures to generate gas, which may cause a swelling phenomenon, a type of swelling phenomenon, due to an increase in pressure, which may cause serious problems such as an explosion of the secondary battery.

[0005] For this reason, the applicant is exploring ways to eliminate risk factors in secondary batteries by inducing gas venting to occur in a specific direction before the internal pressure of the secondary battery increases to the point where it poses a risk of explosion.

[0006] For example, Korean Patent Publication No. 10-2018-0075797 discloses a cylindrical secondary battery in which an electrode assembly and an electrolyte are placed in a metal can and sealed with a top cap, and a gas hole is applied to the top cap. The cylindrical secondary battery is configured such that when a thermal runaway situation occurs, gas inside the metal can is discharged to the outside through the gas hole in the top cap, thereby preventing an increase in internal pressure.

[0007] However, due to its structure, the pouch-type secondary battery 1 cannot be provided with gas holes as in cylindrical or prismatic secondary batteries, and as shown in Fig. 1, the electrode assembly 2 is placed between an upper pouch sheet 3 and a lower pouch sheet 4, and then the four peripheral surfaces of the upper pouch sheet 3 and the lower pouch sheet 4 are heat-sealed to seal the battery, so it is not easy to guide the gas vent in a specific direction. For this reason, there is a need to develop a gas vent means suitable for pouch-type secondary batteries. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above problems, and has an object to reduce risk factors by venting gas in a specific direction when a pouch-type secondary battery swells.

[0009] Other objects and advantages of the present invention will be described below and will become apparent from the following description of the preferred embodiments of the present invention, which can be realized by the configurations and combinations of the configurations set forth in the claims. [Means for solving the problem]

[0010] According to the present invention, a gas vent induction block can be provided that includes a block body having a slit that is configured to allow a cell terrace of a pouch-type secondary battery to be fitted to a predetermined depth, a pocket portion disposed inside the block body and configured to accommodate a portion of the cell terrace in a shape that is wider than the slit, and an exhaust pipe that is tubular and extends from the pocket portion to the outer surface of the block body, the exhaust pipe having a needle portion that protrudes sharply toward the internal space of the pocket portion so as to be able to pierce the cell terrace when the cell terrace expands to a certain volume or more in the pocket portion.

[0011] The block body may include an upper block end and a lower block end that are vertically separated by the slit, and a block front portion that does not have the slit and is connected to the upper block end and the lower block end.

[0012] The upper end portion and the lower end portion of the block are vertically symmetrical, and may be configured such that the thickness of the central region is thinner than the thickness of the peripheral regions on both sides so that the pocket portion is provided.

[0013] One end of the exhaust pipe corresponding to the needle portion is located in the pocket portion, and the other end of the exhaust pipe can be configured to pass through the inside of the block front portion and be exposed to the outside of the block front portion.

[0014] The exhaust pipes may be multiple and may include an upper end exhaust pipe having a needle portion protruding from the upper end of the block toward the pocket portion, and a lower end exhaust pipe having a needle portion protruding from the lower end of the block toward the pocket portion.

[0015] The gas vent guide block may include a cell lead pull-out port having a size corresponding to a width and thickness of an electrode lead of the pouch-type secondary battery, the cell lead pull-out port being provided to penetrate through a front portion of the block and communicate with the pocket portion.

[0016] The gas vent guide block may include two foam members disposed in the pocket and spaced apart from each other above and below with the slit therebetween.

[0017] The needle portion may be configured to reside in the foam member.

[0018] According to another aspect of the present invention, there can be provided a pouch-type secondary battery including the above-mentioned gas vent guide block.

[0019] According to yet another aspect of the present invention, a battery module including the above-mentioned pouch-type secondary battery can be provided. Effect of the Invention

[0020] According to one aspect of the present invention, there is provided a gas vent guide block capable of suppressing an increase in the internal pressure of a pouch-type secondary battery by venting gas when the secondary battery swells. In particular, when the secondary battery swells, the internal gas can be ejected in a specific direction through the gas vent guide block, thereby reducing risk factors due to gas venting.

[0021] The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from this specification and the accompanying drawings. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a pouch-type secondary battery according to the prior art. [Diagram 2] 1 is a plan view of a pouch-type secondary battery according to an embodiment of the present invention; [Diagram 3] 1 is a perspective view showing a portion of a pouch-type secondary battery according to an embodiment of the present invention; [Figure 4]FIG. 2A is a perspective view of a gas vent guide block according to one embodiment of the present invention, and FIG. 2B is a partially cut-away perspective view of the gas vent guide block. [Diagram 5] FIG. 5 is a front view of the gas vent guide block of FIG. 4(a). [Figure 6] FIG. 5 is a rear view of the gas vent guide block of FIG. 4(a). [Figure 7] FIG. 5 is a side view of the gas vent guide block of FIG. 4(a). [Figure 8] FIG. 2 is a cross-sectional view of a gas vent induction block region of the pouch-type secondary battery of the present invention in normal operation. [Figure 9] FIG. 2 is a cross-sectional view of a gas vent induction block region of the pouch-type secondary battery of the present invention during swelling. [Figure 10] FIG. 2 is a diagram showing a portion of a battery module according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the shapes and sizes of the components in the drawings are somewhat exaggerated, omitted, or shown roughly for clearer explanation. Therefore, the size of each component does not directly reflect the actual size. Furthermore, the terms and words used in this specification and claims are not to be interpreted as being limited to their ordinary or dictionary meanings, but are to be interpreted as meanings and concepts corresponding to the technical ideas of the present invention in accordance with the principle that the inventor himself can appropriately define the concepts of terms in order to best describe the invention.

[0024] Therefore, it should be understood that the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and therefore various equivalents and modifications that can be substituted therefor at the time of filing this application. In addition, when it is recognized that a detailed description of a known technology or function related to the present invention may obscure the gist of the present invention in carrying out the present invention, the detailed description will be omitted.

[0025] FIG. 2 is a plan view of a pouch-type secondary battery according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a portion of the pouch-type secondary battery according to an embodiment of the present invention.

[0026] A pouch-type secondary battery 100 according to an embodiment of the present invention may include an electrode assembly, an electrode lead 111, a pouch exterior material, and a gas vent guide block 130.

[0027] The electrode assembly may be composed of a positive electrode plate, a negative electrode plate, a separator, and the like. The positive electrode plate may be formed by applying a positive electrode active material to a current collector plate made of aluminum (Al), and the negative electrode plate may be formed by applying a negative electrode active material to a current collector plate made of copper (Cu). The electrode assembly may be provided as a stack type formed by sandwiching a separator between the positive electrode plate and the negative electrode plate, or a jelly-roll type formed by winding up one positive electrode plate and one negative electrode plate with a separator sandwiched therebetween. Needless to say, the scope of the present invention is not limited thereto. For example, the electrode assembly may be provided as a stack-and-folding type formed by combining the stack type and the jelly-roll type.

[0028] The electrode lead 111 is a portion connected to the electrode assembly and extending to the outside of the pouch exterior material, and can function as an electrode terminal that can be electrically connected to another secondary battery or an external device. The electrode lead 111 includes a positive electrode lead connected to a positive electrode plate and a negative electrode lead connected to a negative electrode plate, and the positive electrode lead and the negative electrode lead can be attached to the electrode assembly so as to be positioned in different directions from each other, as in this embodiment, or to be positioned in the same direction from each other, unlike this embodiment.

[0029] The pouch exterior material forms a sealed space capable of housing and protecting the electrode assembly and the electrolyte, and also serves a heat dissipation function.

[0030] Although not shown in detail for ease of illustration, the pouch exterior material may be composed of two laminated sheets, an upper pouch sheet and a lower pouch sheet. The upper pouch sheet and the lower pouch sheet may include an outer insulating layer and an inner adhesive layer made of a polymer material, and a metal layer interposed between the outer insulating layer and the inner adhesive layer. Here, aluminum (Al) can be used as the material for the metal layer.

[0031] At least one of the upper pouch sheet and the lower pouch sheet may be provided with a concavely formed space capable of accommodating the electrode assembly. For example, the electrode assembly may be disposed in the formed space of the lower pouch sheet, and the upper pouch sheet may be overlaid on the lower pouch sheet. Then, a seal part 120 may be formed along a line bordering the four sides of the periphery of the upper pouch sheet and the lower pouch sheet. Here, the seal part 120 may be defined as a part where the upper pouch sheet and the lower pouch sheet are sealed by a method such as heat sealing.

[0032] Hereinafter, the portions of the seal portion 120 from which the electrode lead 111 protrudes are defined as cell terraces 121 and 122, and the portions without the electrode lead 111 are defined as side wings 123 and 124. That is, in the pouch exterior material, the seal portion 120 on the short side corresponds to the cell terrace 121, and the seal portion 120 on the long side corresponds to the side wings 123 and 124. The region inside the seal portion 120 that encloses the electrode assembly is defined as the electrode accommodating portion 110. It may be advantageous to fold the side wings 123 and 124 and bring them into close contact with the side surfaces of the electrode accommodating portion in order to narrow the width of the secondary battery.

[0033] The gas vent guide block 130 is a component that plays a role in reducing risk factors by creating a hole in the expanded seal portion 120 and allowing the gas to escape in a specific direction when the pressure increases due to gas generation in the pouch-type secondary battery 100 and reaches a risk stage.

[0034] The configuration of the gas vent guide block 130 will be described in detail below with reference to FIGS.

[0035] The gas vent guide block 130 according to one embodiment of the present invention includes a block body 131, a pocket portion 132, an exhaust pipe 133, and two foam members 135, 136.

[0036] As shown in FIG. 3, the gas vent guide block 130 can be configured so that the electrode lead 111 passes through the block body 131 and the cell terrace 121 can be fitted into the block body 131 to a predetermined depth.

[0037] In general, in the case of the pouch-type secondary battery 100, when the internal pressure becomes high, the seal at the cell terraces 121 and 122 where the electrode lead 111 is located tends to break and swell up, rather than at the side wings 123 and 124 side. For this reason, in order to actively exhaust gas from the cell terraces 121 and 122 to the outside, particularly in an emergency, this embodiment is configured so that the gas vent guide block 130 can be fitted into the cell terrace 121 based on the electrode lead 111. Needless to say, unlike this embodiment, it is also possible to fit the gas vent guide block 130 into the side wings 123 and 124 side of the pouch-type secondary battery 100, and in this case, the cell lead pull-out port O for pulling out the electrode lead 111 may be omitted. Details of the cell lead pull-out port O will be described later.

[0038] Specifically, the block body 131 constituting the gas vent guide block 130 is made of an insulating material such as plastic, and can be provided in a generally rectangular parallelepiped shape as shown in Fig. 4. Needless to say, the material of the block body 131 is not necessarily limited to plastic. For example, the block body 131 can also be made of an insulating material such as ceramic.

[0039] The thickness (Z-axis direction) of the block body 131 corresponds to the thickness of the pouch-type battery cell, the left-right length of the block body 131 (±X-axis direction) is shorter than the length from one end to the other end of the cell terrace 121, and the front-to-back length of the block body 131 is longer than the protruding length of the cell terrace 121 (-Y-axis direction) and shorter than the protruding length of the electrode lead 111.

[0040] The block body 131 has a slit S formed in a direction intersecting the thickness direction so that the cell terrace 121 can be fitted inside. The slit S is formed starting from the rear of the block body 131 toward the front by a length corresponding to the protruding length of the cell terrace 121. The slit S allows the rear portion of the block body 131 to be formed in a shape divided into upper and lower parts.

[0041] As a result, the block main body 131 includes a block upper end portion 131a and a block lower end portion 131b which are separated vertically by the slit S, and a block front portion 131c which is a portion without the slit S, connects the block upper end portion 131a and the block lower end portion 131b, and is provided with a cell lead pull-out port O through which the electrode lead 111 can be pulled out.

[0042] The pocket portion 132 is a portion inside the block body 131 that is shaped to have a larger space than the slit S so that the cell terrace 121 can expand inside the block body 131 when gas is generated in the pouch-type secondary battery 100.

[0043] For example, referring to Figures 4 and 6, the block upper end 131a and the block lower end 131b are vertically symmetrical and configured so that the thickness of the central region is thinner than the thickness of the peripheral regions on both sides, thereby making it possible to provide a pocket portion 132 that is wider than the slit S between the block upper end 131a and the block lower end 131b.

[0044] The cell lead pull-out port O is arranged to penetrate the block front portion 131c with a size corresponding to the width and thickness of the electrode lead 111, as shown in (a) of Figure 4, and can be arranged so as to communicate with the pocket portion 132 (in the Y-axis direction) inside the block body 131, as shown in (b) of Figure 4.

[0045] 3, the cell terrace 121 is fitted into the portion of the block body 131 where the slit S is formed, i.e., between the block upper end 131a and the block lower end 131b, and the electrode lead 111 can be pulled out to the outside of the block front part 131c through the cell lead pull-out port O. A part of the cell terrace 121 can be accommodated in the pocket part 132, and the remaining part can be exposed to the outside of the side parts on both sides of the block body 131. In addition, the peripheral parts on both sides of the cell terrace 121 can be folded together with the side wings 123, 124 to be closely attached to the side faces of the electrode accommodating part 110.

[0046] As described above, the exhaust pipe 133 is a component that drills a hole in the cell terrace 121 when the cell terrace 121 contained in the pocket portion 132 expands, and guides the gas ejected from the cell terrace 121 in a specific direction.The exhaust pipe 133 is tubular and can be configured to extend from the pocket portion 132 to the outer surface of the block main body 131.

[0047] For example, as shown in (a) of FIG. 4, the exhaust pipe 133 may be configured such that one end is located in the pocket portion 132 and the other end P passes through the inside of the block front portion 131c and is exposed to the outside of the block front portion 131c.

[0048] In addition, the exhaust pipe 133 may be provided with a needle portion 134 that protrudes sharply toward the internal space of the pocket portion 132 so as to be able to pierce the cell terrace 121 when the cell terrace 121 expands in the pocket portion 132 to a certain volume or more.

[0049] The gas vent induction block 130 of this embodiment has multiple exhaust pipes 133, which include two upper end exhaust pipes 133a each equipped with a needle portion 134 protruding downward from the block upper end 131a toward the pocket portion 132, and two lower end exhaust pipes 133b each equipped with a needle portion 134 protruding upward from the block lower end 131b toward the pocket portion 132.

[0050] The two upper end exhaust pipes 133a may be arranged in the left and right directions (±X-axis directions) based on the cell lead outlet O, and may be configured to pass through the inside of the block upper end 131a and the block front part 131c and be exposed to the outside of the block front part 131c. The two lower end exhaust pipes 133b may be arranged in the left and right directions (±X-axis directions) based on the cell lead outlet O, and may be configured to pass through the inside of the block lower end 131b and the block front part 131c and be exposed to the outside of the block front part 131c.

[0051] The exhaust pipe 133 described above may be made of a metal material such as stainless steel, and may be manufactured integrally with the block body 131 by an insert injection molding method. However, the scope of the present invention is not limited to the material or manufacturing method of the exhaust pipe 133. For example, the exhaust pipe 133 may be made of the same material as the block body 131, and may be injection molded into a shape integrated with the block body 131.

[0052] Meanwhile, the gas vent guide block 130 according to this embodiment may further include two foam members disposed in the pocket portion 132 and spaced apart from each other above and below with the slit S therebetween.

[0053] When the electrode lead 111 and the cell terrace 121 are inserted into the block body 131, there is a risk that the electrode lead 111 or the cell terrace 121 may come into contact with the needle portion 134 and be damaged. The two foam members 135 and 136 are components for preventing the electrode lead 111 or the cell terrace 121 from being damaged unexpectedly in this manner.

[0054] The two foam members 135, 136 are made of a resilient material such as sponge or memory foam, and as shown in FIG. 6, one of them can be attached to the inner surface of the block upper end 131a and the other can be attached to the inner surface of the block lower end 131b, sandwiching a slit S within the pocket portion 132.

[0055] For example, the foam members 135, 136 are pushed into the pocket portion 132 (in the Y-axis direction) in a compressed state, and then the foam members 135, 136 are brought into contact with the inner surface of the block upper end 131a in an upward direction (+Z-axis direction) or the inner surface of the block lower end 131b in a downward direction (-Z-axis direction) so that the needle portion 134 is inserted into the foam members 135, 136. The compression of the foam members 135, 136 is then released so that the foam members 135, 136 return to their original volumes. In this case, the needle portion 134 is driven into the foam members 135, 136, and the foam members 135, 136 may be held in contact with the inner surface of the block upper end 131a or the inner surface of the block lower end 131b. Here, the vertical distance between the two foam members 135, 136 is at least greater than the slit S, and the needle portion 134 can be configured to be positioned in a state where it is driven into the foam members 135, 136.

[0056] Therefore, there is no concern that the electrode lead 111 or the cell terrace 121 will be damaged in the process of pushing the electrode lead 111 and the cell terrace 121 into the pocket portion 132. In this manner, when the cell terrace 121 is positioned in the pocket portion 132, if gas is generated in the pouch-type secondary battery 100 and the cell terrace 121 expands, the foam members 135 and 136 may be compressed under pressure. Furthermore, if the cell terrace 121 expands to a certain volume or more, a hole may be formed by the needle portion 134.

[0057] As the foam members 135, 136, foam members 135, 136 having different degrees of compressibility such as EVA (Ethylene-Vinyl-Acetate) foam, synthetic latex, expanded polystyrene (expanded polystyrene), sponge, etc. For example, as described above, by changing the material of the foam members 135, 136, it is possible to configure so that the needle portion 134 and the cell terrace 121 come into contact with each other only when the expansion force of the cell terrace 121 is equal to or greater than a certain level, thereby enabling gas to be discharged.

[0058] FIG. 8 is a cross-sectional view of the area of ​​gas vent guide block 130 of pouch-type secondary battery 100 of the present invention in a normal state, and FIG. 9 is a cross-sectional view of the area of ​​gas vent guide block 130 of pouch-type secondary battery 100 of the present invention in a swelling state.

[0059] A gas exhaust mechanism of the pouch-type secondary battery 100 using the gas vent guide block 130 will be briefly described below with reference to FIGS.

[0060] 8, the electrode lead 111 passes through the gas vent guide block 130 and is pulled out in the -Y-axis direction, and the cell terrace 121 can be fitted into the gas vent guide block 130 so that a portion of it is housed in a pocket portion 132 of the block body 131. In normal conditions, the cell terrace 121 is spaced a predetermined distance from the needle portion 134, and even if it moves slightly due to external shock or vibration, it is blocked in the vertical direction by two foam members 135 and 136 and does not come into contact with the needle portion 134.

[0061] However, when the internal pressure of the pouch-type secondary battery 100 increases due to the generation of gas, the cell terrace 121 may swell and compress the foam members 135, 136. Furthermore, when the cell terrace 121 expands violently and reaches a certain volume, the needle portion 134 of the exhaust pipe 133 may make a hole in the cell terrace 121 and be drawn into the cell terrace 121, as shown in Fig. 9. As a result, the gas in the cell terrace 121 flows into the needle portion 134, moves along the inside of the exhaust pipe 133, and can be ejected to the outside of the block front portion 131c.

[0062] According to the configuration of this embodiment, when gas is generated in the pouch-type secondary battery 100 due to a situation such as thermal runaway, the gas can be discharged to the outside and the internal pressure can be reduced before the internal pressure rises to the point where the secondary battery explodes, thereby preventing the secondary battery from exploding.

[0063] In addition, when gas is generated, it is possible to prevent the gas from escaping in an unspecified direction due to random damage to the sealed portion 120 of the pouch exterior material. That is, in this embodiment, the gas vent guide block 130 guides the gas discharge in a specific direction, so the gas discharge position is sufficiently predictable, and as a result, the risk factors due to gas discharge can be reduced.

[0064] For example, by ejecting gas in the direction of the electrode lead 111 of the pouch-type secondary battery 100 as in this embodiment, it becomes easier to collect the gas ejected from each pouch-type secondary battery 100 when producing a battery module, and it becomes easier to apply an exhaust device configuration for safely discharging the collected gas to the outside.

[0065] Next, a battery module including the above-mentioned pouch-type secondary battery 100 according to an embodiment of the present invention will be briefly described with reference to FIG.

[0066] FIG. 10 is a diagram illustrating a portion of a battery module according to an embodiment of the present invention.

[0067] As shown in Fig. 10, the battery module according to an embodiment of the present invention may be configured in such a manner that the above-mentioned pouch-type secondary batteries 100 are vertically arranged and stacked in the left-right direction. In the case of a battery module configured using pouch-type secondary batteries according to the prior art, a plurality of bus bars made of a metal material such as copper are used as components for electrically connecting the pouch-type secondary batteries, and a plate-shaped bus bar frame is included to support the plurality of bus bars. However, the battery module according to the present invention may be configured to omit the bus bar frame and assemble the gas vent guiding block 130 of the pouch-type secondary battery 100 in one direction by adhesive or snap-fit ​​coupling, and to mount the bus bar 200 on the block front portion 131c of the gas vent guiding block 130.

[0068] For example, although not shown in the above-described embodiment, as shown in Fig. 10, by processing one area of ​​the block front portion 131c of each gas vent guiding block 130 and joining two gas vent guiding blocks 130, it is possible to configure the gas vent guiding block 130 so as to form a busbar groove into which one of the busbars 200 can be partially fitted. In this case, the pouch-type secondary batteries 100 can be electrically connected to one busbar attached across the two gas vent guiding blocks 130 by bending and welding the positive electrode lead of one of the pouch-type secondary batteries 100 and the negative electrode lead of the remaining pouch-type secondary battery 100.

[0069] Although not shown, the battery module of the present invention may be configured so that gas generated from the secondary battery is safely exhausted outside the battery module by additionally providing a gas piping (not shown) connectable to a hole for exhausting gas from the gas vent guide block 130, i.e., the other end of the exhaust pipe 133. Here, it goes without saying that the gas piping may be realized in the form of a manifold having multiple intake ports and one exhaust port.

[0070] In addition, the battery module of the present invention may further include various devices (not shown) for controlling the charging and discharging of the pouch-type secondary battery 100, such as a battery management system (BMS), a current sensor, and a fuse, as well as a module housing for accommodating the pouch-type secondary battery 100 and the various devices.

[0071] Meanwhile, although directional terms such as up, down, left, right, front, and back can be used in this specification, it will be obvious to those skilled in the art of the present invention that these terms are used merely for convenience of explanation and may vary depending on the position of the object in question or the position of the observer.

[0072] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the equivalent scope of the technical concept of the present invention and the scope of the claims. [Explanation of symbols]

[0073] 1. Pouch-type secondary battery 2 electrode assembly 3 Upper pouch sheet 4 Lower pouch sheet 100 Pouch-type secondary battery 110 Electrode housing 111 Electrode lead 120 Seal part 121 Cell Terrace 122 Cell Terrace 123 Side Wing 124 Side Wing 130 Gas Vent Guidance Block 131 Block Body 131a Block top end 131b Lower end of block 131c Block front 132 Pocket 133 Exhaust Pipe 133a Upper exhaust pipe 133b Lower exhaust pipe 134 Needle part 135 Foam material 136 Foam Members 200 Busbar

Claims

1. a block body having a slit for fitting a cell terrace of a pouch-type secondary battery to a predetermined depth; a pocket portion disposed inside the block body and having a larger space than the slit so as to be able to accommodate a portion of the cell terrace; an exhaust pipe provided in a tubular shape and extending from the pocket portion to an outer surface of the block body; Two foam members are disposed in the pocket portion and are spaced apart vertically with the slit therebetween; Including, the exhaust pipe is provided with a needle portion that protrudes sharply toward an internal space of the pocket portion so as to be capable of piercing the cell terrace when the cell terrace expands to a certain volume or more in the pocket portion, A gas vent guide block, wherein the foam member is compressed by the expansion pressure of the cell terrace.

2. The block body includes: an upper end portion and a lower end portion of the block separated vertically with the slit therebetween; a block front portion that is free of the slit and is connected to the block upper end portion and the block lower end portion; 2. The gas vent inducer block of claim 1, comprising:

3. 3. The gas vent induction block according to claim 2, wherein the upper end portion and the lower end portion of the block are vertically symmetrical, and the thickness of the central region is thinner than the thickness of the peripheral regions on both sides so that the pocket portion is provided.

4. 3. The gas vent induction block according to claim 2, wherein one end of the exhaust pipe corresponding to the needle portion is located in the pocket portion, and the other end of the exhaust pipe is exposed to the outside of the block front portion through the inside of the block front portion.

5. The exhaust pipe is a plurality of pipes, an upper end exhaust pipe including a needle portion protruding from an upper end portion of the block toward the pocket portion; a lower end exhaust pipe including a needle portion protruding from a lower end of the block toward the pocket portion; 5. The gas vent inducer block of claim 4, comprising:

6. 3. The gas vent guide block according to claim 2, further comprising a cell lead pull-out port having a size corresponding to the width and thickness of the electrode lead of the pouch-type secondary battery, the cell lead pull-out port being provided so as to penetrate the front portion of the block and communicate with the pocket portion.

7. The gas vent inducer block of claim 1 , wherein the needle portion is configured to be positioned within the foam member.

8. A pouch-type secondary battery comprising the gas vent guide block according to claim 1 .

9. A battery module comprising the pouch-type secondary battery according to claim 8.

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