Battery module and battery pack including the same

Abstract

A battery module according to the present invention includes a cell stack having a plurality of stacked pouch-type battery cells, a bus bar frame assembly that electrically connects the battery cells, a module case that houses the battery cells, and a vent guide member that is attached to a cell terrace of the pouch case that is heat-sealed to the battery cells and that is provided to form a hole in the cell terrace.

Description

[Technical Field]

[0001] The present invention relates to a battery module and a battery pack including the same, and more particularly to a battery module having excellent safety against thermal events and a battery pack including the same.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0168018 filed on December 5, 2022, and Korean Patent Application No. 10-2023-0043133 filed on March 31, 2023, and the contents disclosed in the specifications and drawings of those applications are incorporated herein in their entirety. [Background technology]

[0003] With the rapid increase in technological development and demand for various mobile devices, electric vehicles, energy storage systems (ESS), etc., interest in and demand for secondary batteries as an energy source is rapidly increasing. Traditionally, nickel-cadmium batteries and nickel-metal hydride batteries were widely used as secondary batteries, but recently lithium secondary batteries have become more popular because they have almost no memory effect compared to nickel-based secondary batteries, can be charged and discharged freely, have an extremely low self-discharge rate, and have a high energy density.

[0004] Such lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively, and include an electrode assembly in which a separator is sandwiched between positive and negative electrode plates coated with the positive and negative electrode active materials, and an exterior material, such as a battery case, that encloses the electrode assembly together with an electrolyte.

[0005] Generally, secondary batteries are classified into can-type batteries in which an electrode assembly is housed in a metal can and pouch-type batteries in which an electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0006] The lithium secondary batteries that are widely used these days have an operating voltage of approximately 2.5 V to 4.5 V per battery. Therefore, in the case of electric vehicles and power storage devices that require large capacity and high output, a battery module or battery pack is constructed by connecting multiple lithium secondary batteries in series and / or parallel, and this is used as an energy source. In particular, to satisfy the output and capacity required for electric vehicles, the battery module or battery pack contains a very large number of lithium secondary batteries.

[0007] Meanwhile, if a thermal event occurs in a battery module containing multiple battery cells and heat continues to accumulate inside the battery module, thermal runaway can rapidly spread between the battery cells, potentially causing major damage such as an explosion of the battery module.

[0008] Therefore, to ensure user safety, battery modules and battery packs must be designed to suppress fire or slow the spread of fire in the early stages of a thermal event.

[0009] As is well known, the three elements of combustion are fuel, oxygen, and heat. Of these, the battery cell, which corresponds to the fuel, is almost impossible to remove in the event of a thermal event. Therefore, to suppress or delay the spread of a thermal event, it is necessary to block the flow of oxygen into the battery module or remove the heat source. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made to solve the above technical problems, and one object of the present invention is to provide a battery module that can effectively dissipate or eliminate heat and pressure before a thermal event intensifies in the battery module.

[0011] The technical problems that the present invention aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention given below. [Means for solving the problem]

[0012] A battery module according to one aspect of the present invention may include a cell stack including a plurality of stacked pouch-type battery cells, a bus bar frame assembly that electrically connects the battery cells, a module case that houses the battery cells, and a vent guide member that is attached to a cell terrace of a pouch case that is heat-sealed to the battery cells and that is provided to form a hole in the cell terrace.

[0013] The vent guide member may be configured to form a hole in a cell terrace of the attached battery cell when the temperature or internal pressure of the battery cell exceeds a predetermined value (a preset value).

[0014] The vent guide member may be a film heater that generates heat when the temperature or internal pressure of the attached battery cell exceeds a predetermined value.

[0015] The film heater may be configured to stop generating heat when a hole is formed in the cell terrace.

[0016] The film heater may be attached to a cell terrace of each of the battery cells, and the film heater attached to the battery cell facing the specific battery cell in which thermal runaway has occurred may be configured to generate heat.

[0017] The battery module may include a control unit that monitors a change in temperature or internal pressure of the pouch-type battery cell and controls the operation of the vent guide member.

[0018] The module case may have a gas vent hole formed in a bottom plate that supports the cell stack below the cell stack.

[0019] The gas vent hole may be provided in a lower region corresponding to a position of a cell terrace of the battery cell.

[0020] The battery module may further include a barrier member that partitions the interior of the module case so that a predetermined number of the battery cells are disposed in each partitioned space within the module case.

[0021] The barrier member may be made of a material having flame retardancy and heat insulation properties, and may be provided in the shape of a plate having a length and width corresponding to the length and height of the module case.

[0022] According to another aspect of the present invention, there may be provided a battery pack including the above-described battery module. [Effects of the Invention]

[0023] According to one aspect of the present invention, when a thermal event occurs inside a battery module, the heat and pressure of the battery cells can be effectively vented or dispersed, thereby preventing a chain reaction explosion of the battery cells and thus preventing the rapid spread of fire inside and outside the battery module.

[0024] In addition, the present invention may have various other effects, which will be described in the sections for each embodiment, or descriptions of effects that can be easily inferred by those skilled in the art will be omitted.

[0025] In addition, according to another aspect of the present invention, directional venting of vent gas generated from a battery cell to the outside of a battery module can be achieved, thereby more safely and effectively relieving internal pressure of the battery module.

[0026] In addition, the present invention may have various other effects, which will be described in the sections for each embodiment, or descriptions of effects that can be easily inferred by those skilled in the art will be omitted. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic perspective view of a battery module according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the battery module of FIG. 1. [Figure 3] 2 is a view of a portion of the battery module of FIG. 1, with an end cover removed, viewed from below. [Figure 4] FIG. 1 illustrates a pouch-type battery cell according to one embodiment of the present invention. [Figure 5] 1 is a schematic cross-sectional view of a battery module according to an embodiment of the present invention; [Figure 6] 4 is a view of a portion of the battery module in FIG. 3 with the bus bar frame assembly separated and viewed from another angle. [Figure 7] FIG. 7 is an enlarged view of area A in FIG. [Figure 8] FIG. 10 is a partial cross-sectional view of a battery module according to another embodiment of the present invention. [Figure 9] FIG. 9 is a partially enlarged view of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims should not be construed as being limited to their ordinary or dictionary meanings, but should be construed as having meanings and concepts corresponding to the technical ideas of the present invention, based on the principle that the inventor himself can appropriately define the concepts of terms in order to best describe the invention. Therefore, it should be understood that the embodiment described in this specification and the configuration shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical ideas of the present invention, and therefore, various equivalents and modifications that can be substituted therefor may exist at the time of filing this application.

[0029] In the drawings, the size of each component or specific parts of the component may be slightly exaggerated, omitted, or shown schematically for ease of explanation and clarity. Therefore, the size of each component does not fully reflect the actual size. If it is recognized that a detailed description of known technologies related to the present invention may obscure the gist of the present invention, the detailed description will be omitted.

[0030] FIG. 1 is a schematic perspective view of a battery module according to one embodiment of the present invention, FIG. 2 is an exploded perspective view of the battery module of FIG. 1, and FIG. 3 is a view of a portion of the battery module of FIG. 1 from below with an end cover removed.

[0031] 1 to 3, a battery module 10 according to one embodiment of the present invention includes a cell stack 100 consisting of battery cells 110, a bus bar frame assembly 200, a module case 300, and a vent guide member 400.

[0032] The battery cell 110 is a pouch-type battery cell 110 and includes an electrode lead 111, an electrode assembly, an electrolyte, and a pouch-type case that hermetically accommodates the electrode assembly and the electrolyte. For example, the pouch-type case may be composed of two pouch sheets, at least one of which may have a recessed groove. The electrode assembly and the electrolyte are placed in the groove, and the edges of the two pouch sheets are heat-sealed. In this pouch-type battery cell 110, the portion where the pouch sheets are heat-sealed is called a sealed portion. One end of the electrode lead 111 is connected to the electrode assembly inside the pouch case, and the other end protrudes outside the pouch case. A portion between the one end and the other end is fixed within the sealed portion when the pouch sheets are heat-sealed. The portion of the electrode lead 111 exposed outside the pouch case may function as an electrode terminal of the pouch-type battery cell 110.

[0033] A pouch-type battery cell 110 that packages an electrode assembly using two pouch sheets may have four sealing portions (front and rear edge portions from which the electrode leads 111 protrude, and both side edge portions intersecting the front and rear edge portions), while a pouch-type battery cell 110 that packages an electrode assembly by folding one pouch sheet may have three sealing portions (front and rear edge portions from which the electrode leads 111 protrude, and a side edge portion opposite the folded side that intersects with the front and rear edge portions). Hereinafter, of these sealing portions, the sealing portion on the side from which the electrode leads 111 protrude is referred to as the cell terrace 113. The cell stack 100 refers to a stack of these pouch-type battery cells 110 that are vertically stacked relative to the ground.

[0034] The bus bar frame assembly 200 is a means for connecting the pouch-type battery cells 110 in series and / or in parallel, and as shown in FIG. 2, includes a bus bar frame 210 and a plurality of bus bars 220, and may be disposed at the front and rear of the cell stack 100.

[0035] The bus bar frame 210 may be formed in a plate shape large enough to cover the front (-Y direction) or rear (+Y direction) of the cell stack 100. The bus bar frame 210 may have a plurality of slits through which the electrode leads 111 of the pouch-type battery cells 110 pass in the +Y axis direction or the -Y axis direction, and may be configured to have a plurality of bus bars 220 assembled on its outer surface. The bus bar frame 210 may be made of, for example, a plastic material so as to have electrical insulation properties.

[0036] The plurality of bus bars 220 may be formed into a rod shape using an electrically conductive (electrically conductive) material, such as a metal material such as copper, aluminum, or nickel. As shown in Fig. 3, the electrode leads 111 of the pouch-type battery cells 110 pass through slits in the bus bar frame 210 and are drawn out to the outside of the bus bar frame 210, and the drawn-out portions may be attached to the surfaces of the bus bars 220 by welding. For example, in stacked pouch-type battery cells 110, the positive electrode leads of one or more pouch-type battery cells 110 and the negative electrode leads of one or more other pouch-type battery cells 110 may be attached to the same bus bar 220, thereby connecting them in series and / or in parallel.

[0037] The module case 300 may include a case body formed in a square tubular shape and a pair of end covers 350, 360 that cover the open ends of the case body. Referring to Figures 1 and 2, the case body may include a top plate 310 that covers the upper part of the cell stack 100, a bottom plate 320 that covers the lower part of the cell stack 100, and a pair of side plates 330, 340 that cover both sides of the cell stack 100.

[0038] Here, the bottom plate 320 and the pair of side plates 330, 340 may be integrally formed. When the bottom plate 320 and the pair of side plates 330, 340 are integrally formed, they may be called a U-shaped frame. The case body of this embodiment can be said to be formed by welding the U-shaped frame and the top plate 310 together. Unlike this embodiment, the case body may be formed by integrally forming the top plate 310, the bottom plate 320, and the pair of side plates 330, 340.

[0039] The cell stack 100 and the bus bar frame assembly 200 are disposed in the internal space of the case body, and a pair of end covers 350, 360 can be joined to the open ends of the case body by welding or the like.

[0040] An adhesive thermal resin (TR) may be applied between the bottom plate 320 and the cell stack 100. This configuration can improve the fixation of the battery cells 110 inside the module case. In addition, the heat transfer rate between the battery cells 110 and the bottom plate 320 is increased, allowing the heat of the battery cells 110 to be more efficiently dissipated to the outside during charging and discharging.

[0041] 2 and 3, the bottom plate 320 may include a gas vent hole 321. In particular, the gas vent hole 321 may be provided in a lower region corresponding to the position of the cell terrace 113 of the battery cell 110, as shown in FIGS.

[0042] 2, 3, 5, and 6, the gas vent holes 321 may be plural and may be provided at regular intervals from positions near both ends in the longitudinal direction (Y direction) of the bottom plate 320 in the left-right direction (X direction). As shown in Fig. 2 or 5, the thermal resin (TR) is configured to be distributed on the bottom plate 320 only up to a position adjacent to the gas vent holes 321 so that the gas vent holes 321 are not blocked. Preferably, the gas vent holes 321 are provided at a position corresponding to a lower region of the cell terrace 113 (front seal portion or rear seal portion) of the pouch-type battery cell 110.

[0043] A secondary battery may generate gas as a side reaction during charging and discharging. In particular, if a large amount of gas is generated during excessive charging and discharging, the internal pressure may rise significantly, causing swelling. If this swelling becomes more severe, the adhesive strength of the heat-sealed seal may weaken, causing the seal to break and release gas. In this case, the cell terrace 113 of the pouch-type battery cell 110, where the electrode lead 111 is attached, has a relatively weaker adhesive strength and a higher temperature than other parts of the seal. Therefore, when the internal pressure of the pouch-type battery cell 110 rises, the cell terrace 113 is most susceptible to damage. Therefore, in the battery module 10 according to one embodiment of the present invention, a gas vent hole 321 is formed in a lower region of the cell terrace 113 corresponding to the position of the cell terrace 113 so that gas released due to damage to the cell terrace 113 can be quickly discharged to the outside of the battery module 10.

[0044] According to the above configuration, for example, in a situation where high-temperature gas is emitted from a trigger battery cell 110 in which a thermal event has occurred among the battery cells 110, the high-temperature gas can be discharged downward through the gas vent hole 321 toward the lower side of the module case 300. In this case, other battery cells 110 adjacent to the trigger battery cell 110 may not be significantly damaged by heat. That is, the transmission of thermal energy between the battery cells 110 may be delayed. In addition, since a large amount of gas can be quickly discharged to the outside of the battery module 10, it is possible to prevent a sudden increase in the internal pressure of the battery module 10, which may result in an explosion or collapse.

[0045] 4 and 5, a battery module 10 according to an embodiment of the present invention includes a vent guide member 400 attached to a cell terrace 113 of a battery cell 110 and forming a hole in the cell terrace 113 of the battery cell 110 when the temperature or internal pressure of the battery cell 110 exceeds a predetermined value. That is, the battery module 10 is configured such that, when a symptom of a thermal abnormality is detected in the battery cell 110, the vent guide member 400 forms a hole in the cell terrace 113 of the battery cell 110, and gas and thermal energy within the battery cell 110 are quickly discharged through the hole.

[0046] In addition, if gas, flame, particles, etc. are explosively ejected from the battery cell 110 under high temperature and pressure due to a thermal event, it can cause significant thermal damage to other surrounding battery cells 110. The vent guide member 400 is a means for preventing such an event, and plays a role in pre-discharging gas and thermal energy from the battery cell 110 under low temperature and low pressure conditions.

[0047] The vent guide member 400 is activated when a symptom of a thermal abnormality in the battery cell 110 is detected. The symptom of a thermal abnormality in the battery cell 110 may be determined based on whether the temperature or internal pressure of the battery cell 110 exceeds a predetermined value (predetermined value). Here, the predetermined value may refer to the maximum value within a normal range of the temperature or internal pressure of the battery cell 110 when the battery cell 110 is charged or discharged. The predetermined value may be set to a value that is at least lower than the temperature or internal pressure at which the battery cell 110 explodes. For reference, the predetermined value may be determined to be different depending on the capacity and size of the battery cell 110 included in the battery module 10.

[0048] In this way, when a thermal abnormality symptom of the battery cell 110 is detected, the vent guide member 400 is activated to form a hole in the cell terrace 113, and thermal energy including gas can be gradually consumed while the battery cell 110 is in a state of relatively low temperature and low pressure. As a result, explosion of the trigger battery cell 110 can be prevented, and thermal damage to the trigger battery cell 110 and other battery cells 110 adjacent to it can also be significantly reduced.

[0049] In this embodiment, a film heater may be used as the vent guide member 400. The film heater may include a resistor pattern 410 and an insulating film 420. For example, the film heater may be formed by printing the resistor pattern 410 on the insulating film 420 using conductive ink. Here, the insulating film 420 may be a PET film or a PI film.

[0050] Specifically, the film heater can be fabricated by printing a resistor pattern 410 on a base film using silver nano (Ag nano) ink, attaching a coverlay film, and then performing a thermal drying process. Although a detailed schematic diagram is shown for convenience of the drawings, an electric wire can be connected to the film heater, and current can be supplied to the resistor pattern 410 of the film heater via the electric wire. While the present embodiment employs a film heater as the vent guide member 400, it will be appreciated that the vent guide member 400 can be any mechanical or electronic configuration as long as it can form a hole in the cell terrace 113.

[0051] The film heater may be preferably attached to each battery cell 110. For example, as shown in FIG. 4, the film heater may be attached to a region below the cell terrace 113 on both sides of the battery cell 110 from which the electrode leads 111 protrude. When the battery cells 110 equipped with the film heater are stacked and housed in the module case 300, the gas vent hole 321 is located below the film heater, as shown in FIGS. 5 to 7. With this configuration, when a symptom of a thermal abnormality is detected in a battery cell 110, the film heater generates heat, forming a hole in the cell terrace 113 of the battery cell 110. Gas and the like leak from the hole, and the leaked gas and the like can be directionally vented downward in the bottom plate 320 through the gas vent hole 321 located directly below. This significantly shortens the path for the gas and the like to be discharged to the outside of the battery module 10, thereby preventing the gas and the like from diffusing into the internal space of the module case 300.

[0052] The vent guide member 400 may be configured to be operated by a control unit (not shown). Control of the vent guide member 400 by the control unit will be described below. However, unlike the present embodiment, it should be noted that the vent guide member 400 may be configured to include a sensor capable of detecting the temperature or pressure of the battery cell 110, to detect signs of abnormality in the battery cell 110 by itself, and to operate in conjunction with the sensor.

[0053] That is, the battery module 10 according to an embodiment of the present invention may further include a control unit (not shown). The control unit may be provided in a form integrated with a battery management system (BMS), which is a general component included in the battery module 10, or may be provided inside or outside the module case 300.

[0054] The control unit may be configured to measure, calculate, receive, or control various electrical, physical, and chemical characteristics of the battery cell 110 or its surrounding environment. For example, the control unit may measure, calculate, or control the voltage, current, temperature, state of charge (SOC), state of health (SOH), internal resistance, and the like of the battery cell 110.

[0055] In addition, the control unit may be configured to monitor a change in temperature or internal pressure of the pouch-type battery cell 110 and send an activation signal to the vent induction member 400. The control unit may be configured to monitor signs of abnormality in the battery cell 110 and control the vent induction member 400 to activate when the temperature or internal pressure of the battery cell 110 exceeds a normal range.

[0056] For example, if the temperature or internal pressure of all monitored battery cells 110 is within a normal range, the control unit cuts off power supplied to all film heaters. However, if the temperature or internal pressure of a specific battery cell 110 exceeds the normal range or continues for a certain period of time without returning to the normal range, the control unit supplies power to the film heater attached to the specific battery cell 110, i.e., the trigger battery cell 110. As a result, the film heater generates heat, forming a hole in the cell terrace 113 of the trigger battery cell 110.

[0057] When a hole is formed in the cell terrace 113, the film heater may stop generating heat. For example, the time from when the film heater starts operating until a hole is formed in the cell terrace 113 may be determined in advance as an operating time, for example, through experimentation. Based on the operating time determined in this manner, the control unit may cut off the power supply to the film heater when the operating time has elapsed, thereby causing the film heater to stop generating heat.

[0058] Meanwhile, unlike this embodiment, an electronic circuit switch having a timer function may be built into the film heater so that power is supplied only during the operating time to cause the film heater to generate heat and the heat generation stops when a hole is formed in the cell terrace 113. Alternatively, a film heater may be used in which the cross-sectional area of ​​the resistor pattern 410 is designed so that the resistor pattern 410 breaks when the temperature reaches a temperature at which the cell terrace 113 melts.

[0059] According to the above-described embodiment, the film heater generates heat enough to form a hole in the cell terrace 113, so that the battery cell 110 can be prevented from catching fire due to continuous heat generation by the film heater.

[0060] Furthermore, the battery module 10 according to an embodiment of the present invention may be configured to operate a film heater attached to a battery cell 110 adjacent to the trigger battery cell 110. That is, among the battery cells 110 housed in the module case 300, a film heater may be configured to operate in a specific battery cell 110 that experiences thermal runaway or gas emission and in a battery cell 110 facing the specific battery cell 110. Here, the film heater attached to the battery cell 110 facing the specific battery cell 110 may be configured to operate even if the temperature and pressure are normal.

[0061] For example, the control unit monitors the temperature and pressure of each battery cell 110, thereby enabling the control unit to identify the locations of the ignited battery cell 110 and the battery cells 110 facing it, thereby enabling the control unit to control the operation of film heaters attached to the ignited battery cell 110 and the battery cells 110 facing it.

[0062] According to the above-described embodiment, a hole is pre-formed in the cell terrace 113 of the battery cell 110 adjacent to the trigger battery cell 110 that is severely deteriorated or has already caught fire. In this case, even if heat from the trigger battery cell 110 is transmitted to the adjacent battery cell 110, the adjacent battery cell 110 can slowly discharge gases and the like under low temperature and low pressure conditions through the pre-formed hole in its cell terrace 113. Therefore, this embodiment has the effect of preventing a chain reaction of explosions of the battery cells 110.

[0063] As described above, according to the configuration and operation of the battery module 10 according to the present invention, when a thermal event occurs inside the battery module 10, the heat and pressure of the battery cells 110 can be effectively dispersed and discharged to the outside, thereby preventing a chain reaction of explosions of the battery cells 110.

[0064] FIG. 8 is a view showing a part of a cross section of a battery module 10 according to another embodiment of the present invention, and FIG. 9 is a partially enlarged view of FIG.

[0065] Next, a battery module 10 according to another embodiment of the present invention will be described with reference to Figures 8 and 9. The same reference numerals as those in the above-described embodiment indicate the same components, and redundant descriptions of the same components will be omitted, with the description focusing on differences from the above-described embodiment.

[0066] Compared to the battery module 10 according to the above-described embodiment, the battery module 10 according to another embodiment of the present invention further includes a barrier member 500 that partitions the interior of the module case 300 so that the battery cells 110 are positioned in a predetermined number of compartment spaces inside the module case 300.

[0067] The barrier member 500 is made of a heat insulating material in the shape of a plate, and may be provided in a pre-assembled form inside the module case 300, or may be provided in a form that is disposed between specific battery cells 110 when the battery cells 110 are stacked.

[0068] The barrier member 500 may be provided in the shape of a plate having a length and width corresponding to the length and height of the module case 300. In Fig. 8, such a battery member may have its lower end in contact with the bottom plate 320 and its upper end in contact with the top plate 310. The barrier member 500 may be made of a flame-retardant and heat-insulating material such as mica so as to block heat transfer between the battery cells 110 and prevent the transfer of flames and gases inside the module case 300.

[0069] 8, when a specific battery cell 110 experiences thermal runaway, heat from the specific battery cell 110 may be transmitted to several surrounding battery cells 110. However, the barrier member 500 may prevent the heat from easily transmitting to battery cells 110 disposed in other compartment spaces.

[0070] Furthermore, before the specific battery cell 110 reaches high temperature and pressure, as shown in FIG. 9 , a hole K1 is formed in the cell terrace 113 of the specific battery cell by the vent guide member 400, and gas, particles, etc. can be emitted through the hole K1. At this time, the emitted gas is prevented from moving to battery cells 110 arranged in other compartments by the barrier member 500. The prevented gas can be directionally vented downward in the battery module 10 through the gas vent hole 321 located at the bottom of the cell terrace 113 of the specific battery cell 110. Therefore, even if a thermal event occurs in the specific battery cell 110, thermal damage to surrounding battery cells 110 can be minimized, and the propagation of thermal runaway between battery cells 110 can be significantly delayed.

[0071] Meanwhile, a battery pack according to the present invention may include one or more battery modules. The battery pack according to the present invention may be applied to automobiles such as electric vehicles. That is, the automobile according to the present invention may include at least one battery pack according to the present invention.

[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 technical spirit of the present invention and the equivalent scope of the appended claims.

[0073] Meanwhile, although directional terms such as up, down, left, right, front, and rear are 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 ease of explanation and may differ depending on the position of the object in question, the position of the observer, etc. [Explanation of symbols]

[0074] 10 Battery Module 100 cell stack 110 Pouch-type battery cell 111 Electrode lead 113 Cell Terrace 200 Busbar frame assembly 210 Busbar Frame 220 Busbar 300 Module Case 310 Top Plate 320 bottom plate 321 Gas vent hole 330 Side Plate 340 Side Plate 350 end cover 360 End Cover 400 Vent guide member 410 Resistance Pattern 420 Insulating film 500 Barrier material Area A K1 hole

Claims

1. a cell stack including a plurality of stacked pouch-type battery cells; a bus bar frame assembly that electrically connects the pouch-type battery cells; a module case that houses the pouch-type battery cell; a vent guide member attached to a cell terrace of a pouch case heat-sealed to the pouch-type battery cell, the vent guide member configured to form a hole in the cell terrace; Including a battery module.

2. 2. The battery module according to claim 1, wherein the vent guide member is configured to form a hole in the cell terrace of the pouch-type battery cell when a temperature or an internal pressure of the pouch-type battery cell to which the vent guide member is attached exceeds a predetermined value.

3. 2. The battery module according to claim 1, wherein the vent guide member is a film heater configured to generate heat when a temperature or an internal pressure of the pouch-type battery cell to which the film heater is attached exceeds a predetermined value.

4. The film heater is The battery module according to claim 3 , wherein the battery module is configured to stop generating heat when a hole is formed in the cell terrace.

5. the film heater is attached to a cell terrace of each of the pouch-type battery cells, The battery module according to claim 3 , wherein a film heater attached to a battery cell facing a specific battery cell in which thermal runaway has occurred among the pouch-type battery cells is configured to generate heat.

6. The battery module according to claim 1 , further comprising a control unit that monitors a change in temperature or internal pressure of the pouch-type battery cell and controls the operation of the vent induction member.

7. The module case includes: The battery module according to claim 1 , wherein a gas vent hole is provided in a bottom plate that supports the cell stack below the cell stack.

8. The gas vent hole is The battery module according to claim 7 , wherein the battery module is provided in a lower region corresponding to a position of a cell terrace of the pouch-type battery cell.

9. 2. The battery module of claim 1, further comprising a barrier member that partitions the interior of the module case so that a predetermined number of the pouch-type battery cells are disposed in each partitioned space within the module case.

10. The barrier member is 10. The battery module according to claim 9, which is made of a material having flame retardancy and heat insulation properties and is configured in the shape of a plate having a length and width corresponding to the length and height of the module case.

11. A battery pack comprising the battery module according to any one of claims 1 to 10.

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