Battery module and battery pack containing it

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 the like and a battery pack including the same.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0168018 filed on December 05, 2022, and Korean Patent Application No. 10-2023-0043133 filed on March 31, 2023, and all the contents disclosed in the specifications and drawings of the applications are incorporated herein.

Background Art

[0003] With the significant increase in the development and demand for various mobile devices, electric vehicles, and energy storage systems (ESS), the interest and demand for secondary batteries as an energy source have been rapidly increasing. Conventionally, nickel-cadmium batteries and nickel-metal hydride batteries have been widely used as secondary batteries. Recently, lithium secondary batteries have been widely used because they have almost no memory effect compared to nickel-based secondary batteries, enabling free charging and discharging, having a very low self-discharge rate, and a high energy density.

[0004] Such lithium secondary batteries mainly use a lithium-based oxide and a carbon material as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with such a positive electrode active material and a negative electrode active material are disposed with a separator interposed therebetween, and an exterior material that encloses the electrode assembly together with an electrolytic solution, for example, a battery case.

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

[0006] Lithium-ion batteries, which are widely used these days, have an operating voltage of approximately 2.5V to 4.5V per unit. Therefore, in the case of electric vehicles and power storage devices that require large capacity and high output, battery modules or battery packs are constructed by connecting multiple lithium-ion batteries in series and / or parallel, and these are used as an energy source. In particular, to satisfy the output and capacity required of electric vehicles, battery modules and battery packs contain a very large number of lithium-ion batteries.

[0007] On the other hand, if a thermal event occurs in a battery module containing multiple battery cells, and heat continuously accumulates inside the battery module, a thermal runaway phenomenon can rapidly propagate between battery cells. In this case, it could cause significant damage, such as an explosion of the battery module.

[0008] Therefore, in order to ensure user safety, battery modules and battery packs must be designed to suppress ignition in the initial stages of thermal events or to delay the spread of ignition.

[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 once a thermal event occurs. Therefore, in order to suppress thermal events or to delay the diffusion of thermal events, it is necessary to block the inflow of oxygen into the battery module or remove the heat source. [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention has been made to solve the above technical problems, and one of its objectives is to provide a battery module that can effectively disperse or eliminate heat and pressure before thermal events in the battery module intensify.

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

[0012] A battery module according to one aspect of the present invention may include a cell stack comprising a plurality of stacked pouch-type battery cells, a busbar frame assembly electrically connecting the battery cells, a module case housing the battery cells, and a vent guide member attached to the cell terrace of the pouch case heat-sealed to the battery cells and provided to form holes in the cell terrace.

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

[0014] The vent induction 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 the cell terrace of each battery cell, and the film heater attached to the battery cell facing the specific battery cell where thermal runaway has occurred may generate heat.

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

[0018] The module case may have gas vent holes in the bottom plate that supports the cell stack at the lower part of the cell stack.

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

[0020] The battery module may further include barrier members that partition the inside of the module case so that a predetermined number of battery cells are arranged in the spaces partitioned inside the module case.

[0021] The barrier member is made of a flame-retardant and heat-insulating material and may be provided in the shape of a plate-like body having a length and width corresponding to the length and height of the module case.

[0022] According to another aspect of the present invention, a battery pack including the above-described battery module may be provided. [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 discharged or dispersed, thereby preventing a chain reaction explosion of the battery cells. Therefore, the rapid propagation of flames to the inside and outside of the battery module can be prevented.

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

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

[0026] In addition to this, the present invention can have various other effects. Regarding this, explanations are provided in the column of each implementation configuration, and for effects that can be easily inferred by those skilled in the art, the explanations thereof are omitted.

Brief Explanation of Drawings

[0027] [Figure 1] It is a schematic perspective view of a battery module according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of the battery module of FIG. 1. [Figure 3] It is a view of removing the end cover from the battery module of FIG. 1 and looking at a part of the battery module from below. [Figure 4] It is a view showing a pouch-type battery cell according to an embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view of a battery module according to an embodiment of the present invention. [Figure 6] It is a view of separating the bus bar frame assembly from a part of the battery module of FIG. 3 and looking at it from another angle. [Figure 7] It is an enlarged view of region A in FIG. 6. [Figure 8] It is a view showing a part of the cross-section of a battery module according to another embodiment of the present invention. [Figure 9] It is a partially enlarged view of FIG. 8.

Modes for Carrying Out the Invention

[0028] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims are not to be interpreted in a manner limited to their usual or dictionary meanings, but rather in a manner corresponding to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concept of terms in order to best describe the invention. Accordingly, the embodiments described herein and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and it should be understood that there are various equivalents and modifications that can be substituted thereat the time of this application.

[0029] In the figures, the size of each component or specific part of a component is sometimes exaggerated, omitted, or shown schematically for ease of explanation and clarity. Therefore, the size of each component does not fully reflect its actual size. Detailed explanations of known technologies related to the present invention are omitted if it is deemed that such explanations would ambiguously obscure the gist of the present invention.

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

[0031] Referring to Figures 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 busbar 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 electrode leads 111, an electrode assembly, an electrolyte, and a pouch-type case that houses the electrode assembly and the electrolyte in a sealed state. For example, the pouch-type case may consist of two pouch sheets, at least one of which may have a concave groove. The electrode assembly and the electrolyte are placed in the groove, and the edges of the two pouch sheets are heat-sealed. In such a pouch-type battery cell 110, the portion of the pouch sheet sealed by heat-sealing is called the seal 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, and a portion between the one end and the other end is fixed inside the seal portion when the pouch sheet is heat-sealed. The portion of the electrode lead 111 exposed outside the pouch case can function as an electrode terminal of the pouch-type battery cell 110.

[0033] A pouch-type battery cell 110 that packages the electrode assembly with two pouch sheets has four sealing parts (a front edge and a rear edge where the electrode leads 111 protrude, and two side edges that intersect with the front and rear edges). A pouch-type battery cell 110 that packages the electrode assembly by folding a single pouch sheet may have three sealing parts (a front edge and a rear edge where the electrode leads 111 protrude, and a side edge on the opposite side of the folded side that intersects with the front and rear edges). Hereinafter, the sealing part on the side where the electrode leads 111 protrude will be referred to as the cell terrace 113. The cell stack 100 refers to a stack of these pouch-type battery cells 110 that are placed vertically to the ground and stacked horizontally.

[0034] The busbar frame assembly 200 is a means for connecting the pouch-type battery cells 110 in series and / or in parallel, and as shown in Figure 2, it includes a busbar frame 210 and a plurality of busbars 220, and may be arranged in the front and rear portions of the cell stack 100.

[0035] The busbar 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 busbar frame 210 may also have a plurality of slits through which the electrode leads 111 of the pouch-type battery cell 110 are passed in the +Y direction or the -Y direction, and may be configured so that a plurality of busbars 220 are assembled on its outer surface. Furthermore, the busbar frame 210 may be made of, for example, a plastic material to have electrical insulation properties.

[0036] The plurality of busbars 220 can be formed in a rod shape from an electrically conductive material, such as a metallic material such as copper, aluminum, or nickel. As shown in Figure 3, the electrode leads 111 of the pouch-type battery cell 110 pass through slits in the busbar frame 210 and are drawn out to the outside of the busbar frame 210, and the portions thus drawn out can be attached to the surface of the busbars 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 can be connected in series and / or parallel to each other by attaching them to the same busbar 220.

[0037] The module case 300 may consist of a case body formed in a rectangular tubular shape and a pair of end covers 350, 360 that cover the open end 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, respectively.

[0038] Here, the bottom plate 320 and the pair of side plates 330 and 340 may be formed integrally. When the bottom plate 320 and the pair of side plates 330 and 340 are provided integrally, it may also be called a U-shaped frame. The case body of this embodiment can also 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 and 340.

[0039] A cell laminate 100 and a busbar frame assembly 200 are arranged in the internal space of the case body, and a pair of end covers 350 and 360 can be joined to the open ends of the case body by welding or the like.

[0040] A thermal resin (TR) with adhesive properties may be applied between the bottom plate 320 and the cell laminate 100. This configuration improves the stability of the battery cells 110 inside the module case. Furthermore, the heat transfer coefficient between the battery cells 110 and the bottom plate 320 is increased, allowing the heat from the battery cells 110 to be dissipated more efficiently to the outside during charging and discharging.

[0041] Furthermore, as shown in Figures 2 and 3, the bottom plate 320 may be provided with gas vent holes 321. In particular, the gas vent holes 321 may be provided in the lower region corresponding to the position of the cell terrace 113 of the battery cell 110, as shown in Figures 5 to 7.

[0042] Specifically, referring to Figures 2, 3, and 5 to 6, there are multiple gas vent holes 321, which can be provided at regular intervals from each other in the left-right direction (X direction) starting from positions near both ends along the longitudinal direction (Y direction) of the bottom plate 320. Then, as shown in Figure 2 or Figure 5, the thermal resin (TR) is configured to be distributed on the bottom plate 320 only up to positions 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 positions corresponding to the lower region of the cell terrace 113 (front seal portion or rear seal portion) in the pouch-type battery cell 110.

[0043] Secondary batteries can generate gas as a side reaction during charging and discharging. In particular, if a large amount of gas is generated during overcharging and discharging, causing a significant increase in internal pressure, a swelling phenomenon may occur. If this becomes more severe, the bonding strength of the heat-fused seal portion weakens, potentially causing that portion to rupture and gas to be ejected. In this case, in the pouch-type battery cell 110, the cell terrace 113 portion, to which the electrode leads 111 are bonded together, has a relatively lower bonding strength and higher temperature than other parts of the seal portion. Therefore, when the internal pressure of the pouch-type battery cell 110 rises, the cell terrace 113 portion is the most vulnerable to damage. Accordingly, in the battery module 10 according to one embodiment of the present invention, a gas vent hole 321 is configured in the 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 immediately 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 ejected from a trigger battery cell 110 where a thermal event has occurred, the high-temperature gas can be discharged downwards towards the module case 300 through the gas vent hole 321. In this case, the other battery cells 110 adjacent to the trigger battery cell 110 may not suffer significant thermal damage. That is, the propagation of thermal energy between 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 the internal pressure of the battery module 10 from rising rapidly and causing an explosion or collapse.

[0045] A battery module 10 according to one embodiment of the present invention, as shown in Figures 4 and 5, includes a vent guide member 400 attached to the cell terrace 113 of a battery cell 110, which forms 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, when signs of a thermal abnormality are detected in the battery cell 110, the battery module 10 is configured such that the vent guide member 400 forms a hole in the cell terrace 113 of the battery cell 110, allowing gas and thermal energy inside the battery cell 110 to be discharged early through the hole.

[0046] To elaborate, if gas, flames, particles, etc. are explosively ejected from a battery cell 110 experiencing a thermal event under high temperature and pressure, the thermal damage to other surrounding battery cells 110 can be extremely large. The vent guide member 400 is a means to prevent such a situation and plays a role in pre-releasing gas and thermal energy from the battery cell 110 under low temperature and low pressure conditions.

[0047] The vent guide member 400 activates when signs of thermal abnormality in the battery cell 110 are detected. These signs of thermal abnormality in the battery cell 110 can be determined based on whether the temperature or internal pressure of the battery cell 110 exceeds a predetermined value (a pre-set value). Here, the predetermined value may represent the highest value within the normal range for the temperature or internal pressure of the battery cell 110 during charging and discharging. The predetermined value can be set to a value at least lower than the temperature or internal pressure at which the battery cell 110 would explode. For reference, the predetermined value may be determined to differ depending on the capacity and size of the battery cell 110 included in the battery module 10.

[0048] Thus, when thermal abnormalities are detected in the battery cell 110, the vent guide member 400 is activated to form a hole in the cell terrace 113, allowing the battery cell 110 to gradually dissipate thermal energy, including gas, at a relatively low temperature and low pressure. As a result, the 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 resistance pattern 410 and an insulating film 420. For example, the film heater may have a resistance pattern 410 printed on the insulating film 420 with conductive ink. Here, the insulating film 420 may be a PET film or a PI film.

[0050] Specifically, the film heater can be manufactured by printing a resistance pattern 410 on a base film with silver nano (Ag nano) ink, attaching a coverlay film, and then performing a heat drying process. For the convenience of the drawings, the details are shown schematicly, but an electric wire is connected to the film heater, and current can be supplied to the resistance pattern 410 of the film heater via the electric wire. On the other hand, although a film heater is used as the vent guide member 400 in this embodiment, it is clear 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 can preferably be attached to each battery cell 110. For example, as shown in Figure 4, it can be attached to the area below the cell terraces 113 on both sides of the battery cell 110 where the electrode leads 111 protrude. When the battery cells 110 with the film heaters attached are stacked and housed in the module case 300, the gas vent hole 321 is located in the lower area of ​​the film heater, as shown in Figures 5 to 7. With this configuration, when signs of a thermal abnormality are detected in the battery cell 110, the film heater generates heat, forming a hole in the cell terrace 113 of the battery cell 110, and gas leaks out from the hole. The leaked gas can then be directionally vented downwards to the bottom plate 320 via the gas vent hole 321 located directly below. Therefore, the path through which the gas is discharged to the outside of the battery module 10 is significantly shortened, preventing it 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). The control of the vent guide member 400 by the control unit will be described below. However, unlike this embodiment, it should be made clear in advance that the vent guide member 400 may be configured to detect signs of abnormality in the battery cell 110 on its own, including a sensor capable of detecting the temperature or pressure of the battery cell 110, and to operate in conjunction with the sensor.

[0053] In other words, a battery module 10 according to one embodiment of the present invention may further include a control unit (not shown). The control unit may be provided integrated into a battery management system (BMS), which is a common component included in the battery module 10, or it 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 properties of the battery cell 110 or its surrounding environment. For example, the control unit can measure, calculate, or control the voltage, current, temperature, charge state (SOC), health state (SOH), internal resistance, etc., of the battery cell 110.

[0055] Furthermore, the control unit may be configured to monitor changes in temperature or internal pressure of the pouch-type battery cell 110 and to transmit an activation signal to the vent guide member 400. The control unit may also be configured to monitor signs of abnormality in the battery cell 110 and to control the vent guide member 400 to activate if the temperature or internal pressure of the battery cell 110 exceeds the 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 shuts off the power supply to all film heaters. However, if the temperature or internal pressure of a particular battery cell 110 exceeds the normal range or persists for a certain period of time without returning to the normal range, the control unit allows power to be supplied to the film heater attached to that particular battery cell 110, i.e., the trigger battery cell 110. The film heater then heats up, 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 heat generation of the film heater may stop. For example, the time from when the film heater starts operating until a hole is formed in the cell terrace 113 can be predetermined as the operating time through experiments or other means. Based on the operating time thus determined, the control unit can cut off the power supply to the film heater when the operating time has elapsed, thereby stopping the heat generation of the film heater.

[0058] On the other hand, unlike this embodiment, an electronic circuit switch with a timer function can be built into the film heater so that power is supplied only during the operating time to heat the film heater, and the heating stops when a hole is formed in the cell terrace 113. Alternatively, a film heater can be used in which the cross-sectional area of ​​the resistance pattern 410 is designed so that the resistance pattern 410 breaks when it reaches a temperature at which the cell terrace 113 melts.

[0059] According to the above implementation configuration, the film heater generates enough heat to form holes in the cell terrace 113, thus preventing the battery cell 110 from igniting due to continuous heat generation from the film heater.

[0060] Furthermore, a battery module 10 according to one embodiment of the present invention may be configured to activate film heaters attached to a trigger battery cell 110 and adjacent battery cells 110. That is, among the battery cells 110 housed in the module case 300, the film heaters of a specific battery cell 110 that is experiencing thermal runaway or gas ejection and the battery cell 110 facing it on one side may be configured to activate. Here, the battery cell 110 facing the specific battery cell 110 may be configured to activate its attached film heater even if its temperature and pressure are normal.

[0061] For example, the control unit monitors the temperature and pressure of each battery cell 110, allowing it to pinpoint the location of the ignited battery cell 110 and the battery cell 110 facing it. This enables the control unit to control the operation of the film heaters attached to the ignited battery cell 110 and the battery cell 110 facing it.

[0062] According to the above-described implementation, holes are pre-formed in the cell terraces 113 of the battery cell 110 adjacent to the trigger battery cell 110 that is severely deteriorated or has already ignited. In this case, even if the heat from the trigger battery cell 110 is transmitted to the adjacent battery cell 110, the adjacent battery cell 110 can slowly release gas, etc., under low temperature and low pressure conditions through the holes pre-formed in its cell terrace 113. Therefore, this implementation has the effect of preventing a chain reaction explosion of battery cells 110.

[0063] As described above, with 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. This prevents a chain reaction explosion of the battery cells 110.

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

[0065] Next, with reference to Figures 8 and 9, a battery module 10 according to another embodiment of the present invention will be described. The same reference numerals for components as in the previously described embodiments indicate the same components, and redundant explanations of the same components will be omitted. The explanation will focus on the differences from the previously described embodiments.

[0066] A battery module 10 according to another embodiment of the present invention further includes barrier members 500 that partition the interior of the module case 300 so that the battery cells 110 are located in a predetermined number of partitioned spaces inside the module case 300, compared to the battery module 10 according to the above-described embodiment.

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

[0068] The barrier member 500 may be provided in the shape of a plate-like body having a length and width corresponding to the length and height of the module case 300. In Figure 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, to block thermal transfer between the battery cells 110 and prevent the movement of flames and gases inside the module case 300.

[0069] Specifically, referring to Figure 8, if a particular battery cell 110 experiences thermal runaway, the heat from that particular battery cell 110 may propagate to several surrounding battery cells 110. However, the barrier member 500 may prevent the heat from easily propagating to battery cells 110 located in other compartments.

[0070] Furthermore, before the specific battery cell 110 becomes hot and high-pressure, as shown in Figure 9, a hole K1 is formed in the cell terrace 113 of the specific battery cell by the vent guide member 400, allowing gas, particles, etc., to be ejected through the hole K1. At this time, the ejected gas is prevented from moving to other battery cells 110 located in other compartment spaces by the barrier member 500. The blocked gas can then be directionally vented downwards 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 the surrounding battery cells 110 can be minimized, and the propagation of thermal runaway between battery cells 110 can be significantly delayed.

[0071] On the other hand, the battery pack according to the present invention may include one or more of the battery modules. Furthermore, the battery pack according to the present invention is applicable to automobiles such as electric vehicles. That is, an automobile according to the present invention may include at least one of the battery packs according to the present invention.

[0072] Although the present invention has been described above with reference to limited embodiments and drawings, it goes without saying that the present invention is not limited thereto, and that various modifications and variations are possible within the equivalent scope of the technical idea of ​​the present invention and the appended claims by persons with ordinary skill in the art to which the present invention pertains.

[0073] On the other hand, while directional terms such as up, down, left, right, front, and back have been used in this specification, these terms are used merely for ease of explanation, and it will be obvious to those skilled in the art that they may vary depending on the position of the object in question, the observer's position, etc. [Explanation of Symbols]

[0074] 10 Battery Modules 100-cell stack 110 Pouch-type battery cells 111 Electrode Leads 113 Cell Terrace 200 Busbar Frame Assembly 210 Busbar Frame 220 Bus Bar 300 Module Case 310 Top Plate 320 Bottom Plate 321 Gas vent holes 330 Side Plate 340 Side Plate 350 End Cover 360 End Cover 400 Vent guide member 410 Resistor Pattern 420 Insulating Film 500 Barrier members Area A K1 hole

Claims

1. A cell stack comprising multiple stacked pouch-type battery cells, A busbar frame assembly for electrically connecting the pouch-type battery cells, A module case for housing the aforementioned pouch-type battery cell, A vent guide member attached to the cell terrace of a pouch case heat-sealed to the pouch-type battery cell, wherein the vent guide member is configured to form a hole in the cell terrace, Includes, The vent induction member is a film heater configured to generate heat when the temperature or internal pressure of the pouch-type battery cell to which the film heater is attached exceeds a predetermined value, in a battery module.

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 the temperature or internal pressure of the pouch-type battery cell to which the vent guide member is attached exceeds a predetermined value.

3. The aforementioned film heater is The battery module according to claim 1, configured to stop generating heat when a hole is formed in the cell terrace.

4. The film heater is attached to the cell terrace of each of the pouch-type battery cells. The battery module according to claim 1, wherein a film heater attached to a battery cell facing a specific battery cell among the pouch-type battery cells that has experienced thermal runaway is configured to generate heat.

5. A cell stack comprising a plurality of stacked pouch-type battery cells, A busbar frame assembly for electrically connecting the pouch-type battery cells, A module case for housing the aforementioned pouch-type battery cell, A vent guide member attached to the cell terrace of a pouch case heat-sealed to the pouch-type battery cell, wherein the vent guide member is configured to form a hole in the cell terrace, Includes, A battery module including a control unit that monitors changes in temperature or internal pressure of the pouch-type battery cell and controls the operation of the vent guide member.

6. The aforementioned module case is The battery module according to claim 1, wherein a gas vent hole is provided in the bottom plate that supports the cell stack at the lower part of the cell stack.

7. The aforementioned gas vent hole is The battery module according to claim 6, provided in a lower region corresponding to the position of the cell terrace of the pouch-type battery cell.

8. The battery module according to claim 1, further comprising a barrier member that partitions the interior of the module case so that a predetermined number of pouch-type battery cells are arranged in the spaces partitioned inside the module case.

9. The barrier member is The battery module according to claim 8, comprising a flame-retardant and heat-insulating material, and configured in the shape of a plate-like body having a length and width corresponding to the length and height of the module case.

10. A battery pack comprising a battery module according to any one of claims 1 to 9.

Images