Battery module and battery pack including same

Abstract

A battery module according to the present invention may include a cell stack having a plurality of battery cells stacked in one direction, a module case that houses the cell stack, and a heat propagation blocking sheet that is formed of a heat-resistant material and surrounds at least a portion of the cell stack inside the module case.

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 to which a heat propagation blocking means is applied, which can suppress or delay a chain reaction of ignition to other surrounding battery modules when a thermal event occurs in a battery cell included in a specific battery module, and a battery pack including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2022-0096773, filed on August 3, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] Semi-permanent batteries that convert electrical energy into a form of chemical energy and can be repeatedly charged and discharged are called secondary batteries, which are different from primary batteries, which are disposable and cannot be reused.

[0004] Secondary batteries include lithium secondary batteries, nickel-cadmium (Ni-Cd) batteries, lead-acid batteries, nickel-metal hydride (Ni-MH) batteries, air-zinc batteries, alkaline manganese batteries, etc. Of these, lead-acid batteries and lithium secondary batteries are the most commercially available secondary batteries.

[0005] In particular, lithium secondary batteries have been widely used in recent years as batteries for electric vehicles because they have advantages such as high energy storage density, light weight and small size, excellent safety, low discharge rate, and long life.For reference, lithium secondary batteries are generally classified into cylindrical, square, and pouch types according to the manufacturing form, and are used not only as batteries for electric vehicles, but also as ESS batteries and other electric devices.

[0006] Currently, the operating voltage of one lithium secondary battery cell is about 2.5 V to 4.5 V. Therefore, in order to use a secondary battery as an energy source for an electric vehicle, a plurality of lithium ion battery cells are connected in series and / or parallel to form a battery module, and the battery modules are further connected in series and / or parallel to form a battery pack.

[0007] Meanwhile, secondary batteries may degrade in performance if used in an environment with a higher temperature than the appropriate temperature because they undergo chemical reactions during charging and discharging, and may unexpectedly catch fire or explode if heat is not controlled to the appropriate temperature. In addition, a battery module is structured such that such secondary batteries are collectively housed inside a module case, and if any one secondary battery experiences thermal runaway and becomes a trigger cell, the heat and flames are quickly propagated to the surrounding secondary batteries, making the secondary batteries more likely to catch fire in a chain reaction. Furthermore, since a typical battery pack has multiple battery modules arranged closely together, if a thermal event occurs in any one battery module and the battery module collapses, other surrounding battery modules may also catch fire in a chain reaction and may even explode.

[0008] For example, the module case of a battery module made of aluminum (Al) material has a low thermal melting point and cannot withstand the thermal runaway of the secondary battery housed therein, and in particular, the front cover or rear cover of the module case, which covers the portion where the electrode lead and the bus bar are connected for electrical connection of the secondary battery, is made mostly of a plastic material for insulation and is easily destroyed in the event of thermal runaway of the secondary battery. For this reason, there is a demand for an improved structure for the battery module and battery pack that can delay the destruction of the battery module even if a thermal runaway situation occurs in the secondary battery, thereby suppressing the rapid propagation of the thermal runaway phenomenon to other surrounding battery modules and ensuring sufficient time for users to evacuate. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made in consideration of the above problems, and has an object to provide a battery module that can prevent or delay the structural collapse of the battery module when a thermal runaway occurs in a battery cell.

[0010] However, the technical problems that the present invention aims to solve are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0011] In order to achieve the above object, a battery module according to the present invention may include a cell stack having a plurality of battery cells stacked in one direction, a module case that houses the cell stack, and a heat propagation blocking sheet that is formed of a heat-resistant material and surrounds at least a portion of the cell stack inside the module case.

[0012] The heat propagation blocking sheet may include a silicone polymer that is ceramified by heat.

[0013] The cell stack may include a plurality of pouch-type battery cells stacked horizontally, and the heat propagation blocking sheet may be provided to cover at least one of an upper portion, a lower portion, a left side portion, a right side portion, a front portion, and a rear portion of the cell stack.

[0014] The heat propagation blocking sheet may be provided between the stacked pouch-type battery cells.

[0015] The heat propagation blocking sheet may include a first cover surface covering an upper portion of the cell stack, and second and third cover surfaces covering a front portion and a rear portion of the cell stack, respectively.

[0016] The second cover surface and the third cover surface may include a lead lead portion through which an electrode lead of the pouch-type battery cell passes.

[0017] The lead pull-out portion may include a sheet slit formed by partially cutting the sheet slit so as to sandwich a predetermined number of the electrode leads.

[0018] The sheet slit with the electrode lead sandwiched therein may be sealed by applying fireproof tape to the sheet slit.

[0019] The module case may include a case body configured to surround an upper portion, a lower portion, a left portion, and a right portion of the cell stack excluding a front portion and a rear portion where electrode leads of the battery cells are located, and end covers coupled to the case body to cover the front and rear of the cell stack.

[0020] The heat propagation blocking sheet may be configured to surround the front or rear of the cell stack, and the electrode leads of the battery cells may be configured to pass through the heat propagation blocking sheet.

[0021] According to another aspect of the present invention, a battery pack may be provided that includes one or more battery modules as described above.

[0022] According to yet another aspect of the present invention, there may be provided a vehicle including a battery pack as described above. Effect of the Invention

[0023] According to one aspect of the present invention, it is possible to provide a battery module capable of preventing or delaying structural collapse of the battery module upon thermal runaway of a battery cell.

[0024] In particular, according to one aspect of the present invention, when a thermal runaway occurs in a battery cell, the heat propagation blocking sheet can absorb heat during the ceramicization process, thereby suppressing or delaying a temperature rise in the battery cell.

[0025] According to one aspect of the present invention, the heat propagation blocking sheet can prevent gas, flames, high-temperature particles, etc. emitted from the battery cells, thereby suppressing temperature rise and damage to the module case, and therefore significantly slowing down the rate at which the structure of the battery module collapses when a thermal event occurs.

[0026] According to one aspect of the present invention, it is possible to suppress sudden collapse of the end cover portion that is particularly vulnerable to heat. Here, the end cover is a part of the module case that covers the connection portion between the electrode lead and the bus bar, and may be made of a non-metallic material.

[0027] In the battery module according to the present invention, the front or rear of the cell stack may be surrounded by a heat propagation blocking sheet, and the electrode leads may be configured to penetrate the heat propagation blocking sheet. With this embodiment, it is possible to protect the end cover portion, which is the most heat-sensitive part of the module case, from high-temperature gas, flames, particles, etc. that are ejected from the front or rear of the cell stack.

[0028] The effects of the present invention are not limited to the effects described above, and other effects of the present invention 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]

[0029] [Figure 1] 1 is a schematic perspective view of a battery module according to an embodiment of the present invention; [Diagram 2] 1 is an exploded perspective view of a main configuration of a battery module according to an embodiment of the present invention; [Diagram 3] 1 is a perspective view showing a cell stack to which a heat propagation blocking sheet according to an embodiment of the present invention is applied; [Figure 4] FIG. 11 is a perspective view showing a cell stack to which a heat propagation blocking sheet according to another embodiment of the present invention is applied. [Diagram 5]FIG. 11 is a perspective view showing a cell stack to which a heat propagation blocking sheet according to still another embodiment of the present invention is applied. [Figure 6] FIG. 6 is a schematic perspective view of the heat propagation blocking sheet of FIG. 5. [Figure 7] FIG. 6 is a view corresponding to the enlarged area of ​​FIG. 5, showing an example in which fireproof tape is applied to the electrode lead extraction portion of the heat propagation blocking sheet. [Figure 8] 11A and 11B are diagrams illustrating an example of gas or flame blocking by a heat propagation blocking sheet according to still another embodiment of the present invention. [Figure 9] 4 is a schematic cross-sectional view of a portion of a battery module according to yet another embodiment of the present invention. [Figure 10] 1 is a diagram illustrating a schematic configuration of a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as being in accordance with the meaning and concept of the technical idea of ​​the present invention, in accordance with the principle that the inventor himself can appropriately define the concept of the term 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 only one most preferred embodiment of the present invention, and do not represent the entire technical idea of ​​the present invention, and therefore there may be various equivalents and modifications that can be substituted for them at the time of this application.

[0031] 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 main components of a battery module according to one embodiment of the present invention, and FIG. 3 is a perspective view showing a cell stack to which a heat propagation blocking sheet according to one embodiment of the present invention is applied.

[0032] 1 to 3, a battery module 10 according to an embodiment of the present invention includes a cell stack 100, a module case 200, and a heat propagation blocking sheet 300. As shown in FIG.

[0033] The cell stack 100 is an assembly of battery cells 110 formed by stacking a plurality of battery cells 110. For example, as shown in FIG. 2, the cell stack 100 may be composed of a plurality of pouch-type battery cells 110 stacked in a horizontal direction (X direction) with their wide surfaces standing. A compressible pad 120 may be disposed on an outer surface of the outermost battery cell 110 in the cell stack 100. The compressible pad 120 is formed of, for example, a foam material, and serves to absorb swelling pressure of the cell stack 100 and to insulate the cell stack 100 from the module case 200.

[0034] The pouch-type battery cell 110 includes an electrode assembly, a pouch exterior material that houses the electrode assembly, and a pair of electrode leads 113 that are connected to the electrode assembly and are drawn out to the outside of the pouch exterior material to function as electrode terminals. The pair of electrode leads 113 are drawn out in opposite directions in the longitudinal direction (±Y direction) of the battery cell 110. Although not shown, the pouch-type battery cell 110 may have a shape in which the electrode leads 113 are located only at one end in the Y-axis direction, for example, at an end in the +Y-axis direction.

[0035] The pouch-type battery cell 110 may include a receiving portion and an edge portion. Here, the receiving portion may be a portion in which an electrode assembly and an electrolyte are received. And, the edge portion may be a portion surrounding the receiving portion. In particular, the edge portion may be a sealing portion 112 in which the pouch exterior material is thermally welded and sealed. For example, four edge portions may be provided, and the four edge portions may be located at the upper edge, the lower edge, the front edge, and the rear edge, respectively, based on the receiving portion. In this case, all four edge portions or three edge portions may be the sealing portion 112. Here, both the front edge portion and the rear edge portion from which the electrode lead 113 is drawn out may include the sealing portion 112.

[0036] 2, the cell stack 100 may be provided in a substantially hexahedral shape and may be divided into an upper part, a lower part, a left part, a right part, a front part, and a rear part. Here, the upper part and the lower part correspond to the upper edge part and the lower edge part, respectively, of the pouch-type battery cell 110, the left part and the right part correspond to the outer surface (or the compressible pad 120) of the outermost battery cell 110 along the stacking direction of the cell stack 100, and the front part and the rear part may refer to the parts corresponding to the front edge part and the rear edge part, respectively, of the pouch-type battery cell 110.

[0037] A bus bar assembly 400 may be attached to the front and rear of the cell stack 100. The bus bar assembly 400 includes a bus bar frame 410 and a plurality of bus bars 420 as a means for connecting the pouch-type battery cells 110 in series and / or parallel to each other.

[0038] The bus bar frame 410 is provided in the form of a plate-like body with a size covering the front (-Y direction) or rear (+Y direction) of the cell stack 100. The bus bar frame 410 may also have a plurality of frame slots through which the electrode leads 113 of the pouch-type battery cells 110 pass in the +Y-axis or -Y-axis direction, and may be configured to allow a plurality of bus bars to be attached to its outer surface in the same direction as the stacking direction of the battery cells 110. Such a bus bar frame 410 may be made of, for example, plastic for electrical insulation with the electrode leads 113.

[0039] The bus bars 420 may be formed in the shape of a rod made of an electrically conductive material, for example, a metal material such as copper, aluminum, or nickel, and may be disposed in the bus bar frame 410 so as not to interfere with the frame slots. The electrode leads 113 of the pouch-type battery cells 110 may be drawn out to the outside of the bus bar frame 410 through the frame slots, and the drawn-out portions may be bent and attached to the surface of the bus bar 420 by welding or the like. For example, the pouch-type battery cells 110 may be electrically connected to each other by attaching a positive electrode lead of one or more pouch-type battery cells 110 and a negative electrode lead of one or more other pouch-type battery cells 110 to the same bus bar.

[0040] The module case 200 is a component for protecting the cell stack 100 from external impacts, and is preferably made of a metal material having excellent mechanical rigidity. The module case 200 according to the present embodiment may include a case body 210 and an end cover 220, as shown in FIGS. 1 and 2.

[0041] The case body 210 may be configured to surround the upper, lower, left and right sides of the cell stack 100, excluding the front and rear parts where the electrode leads 113 of the battery cells 110 are located. For example, as shown in FIG. 2, the case body 210 has a hollow structure with an open interior, and both ends along the longitudinal direction are open to provide an opening. That is, the case body 210 may be configured in a rectangular tube shape. The cell stack 100 may be inserted into the case body 210 along the longitudinal direction, and the upper, lower, left and right sides may be surrounded by the case body 210.

[0042] For reference, the case body 210 may be configured to have one or more resin injection holes on the bottom surface. Although not shown, after inserting the cell stack 100 into the case body 210, thermal resin (not shown) may be injected into the case body 210 through the resin injection holes, thereby filling the space between the bottom surface of the case body 210 and the lower part of the cell stack 100 with thermal resin. Such thermal resin may advantageously enhance the fixation of the cell stack 100 to the case body 210 and improve heat dissipation. Meanwhile, the case body 210 according to this embodiment is a one-piece rectangular tube. However, unlike this embodiment, the case body 210 may be configured by combining two or more plates.

[0043] The end cover 220 may be configured to cover the front or rear of the cell stack 100 and to be coupled to the case body 210. For example, the end cover 220 may be provided in a size corresponding to an opening of the case body 210 and may be configured to be fixedly coupled to the case body 210 by a method such as snap-fit, bolting, or welding. In this manner, the end cover 220 may be coupled to the case body 210 so that the electrode leads 113 and the bus bar are not exposed to the outside. In addition, the end cover 220 may be entirely made of a plastic material or at least one surface facing the bus bar may be made of an electrically insulating material in order to ensure electrical insulation. In addition, the end cover 220 may include a part that is partially cut out or a part that is perforated. This may be a configuration applied to dispose a positive electrode terminal and a negative electrode terminal from the inside to the outside of the battery module 10 or to provide a cable connector (not shown), etc.

[0044] Meanwhile, the heat propagation blocking sheet 300 is a component for preventing the module case 200 from collapsing due to high-temperature gas or flames in a situation where a thermal event occurs inside the battery module 10. The heat propagation blocking sheet 300 may be formed of a heat-resistant material and configured to surround at least a portion of the cell stack 100 inside the module case 200.

[0045] For example, the heat propagation blocking sheet 300 may be provided to cover at least one of the upper, lower, left side, right side, front and rear portions of the cell stack 100 .

[0046] In particular, the heat transmission blocking sheet 300 according to the present invention may include a silicone polymer that is ceramicized by heat. The heat transmission blocking sheet 300 is soft at room temperature, but when the temperature rises, it may be cross-linked by a thermal reaction and change into a hard solid ceramic phase. In the battery module 10 according to the present invention, since the cell stack 100 is surrounded by the heat transmission blocking sheet 300, even if a thermal event occurs inside and high-temperature gas or flames are emitted from the battery cell 110, the module case 200 is protected by the heat transmission blocking sheet 300, so that the structure is not easily destroyed. That is, when a thermal event occurs, the heat transmission blocking sheet 300 is hardened and ceramicized by a thermal reaction. At this time, the heat transmission blocking sheet 300 absorbs heat during the ceramicization process, so that the high-temperature gas is cooled and the ignition of the battery cell 110 is suppressed. In addition, since the heat propagation blocking sheet 300 is ceramicized and its mechanical rigidity is increased, the heat propagation blocking sheet 300 is less likely to be perforated even when not only gas and flame but also high-temperature particles (e.g., electrode plate fragments detached from the electrode assembly) are ejected from the battery cell 110.

[0047] More specifically, as shown in FIG. 2 and FIG. 3, the heat propagation blocking sheet 300 according to an embodiment of the present invention may be configured to cover the upper part of the cell stack 100. In this case, preferably, the upper edge part of the pouch-type battery cell 110 may have a sealing part 112 in which the pouch exterior material is heat-sealed, and the lower edge part may be configured to surround the edge part of the electrode assembly built-in by folding the pouch exterior material. In the case of the pouch-type battery cell 110, since the sealing part 112 part of the pouch exterior material is weak against pressure, the sealing part 112 is easily broken in the event of thermal runaway, and gas, flame, particles, etc. are easily ejected. For this reason, in this embodiment, the heat propagation blocking sheet 300 is disposed on the upper part of the cell stack 100, and the upper part of the cell stack 100 may be the upper edge part in the pouch-type battery cell 110 in which the sealing part 112 is provided.

[0048] For example, if a fire occurs inside the sealed battery module 10, high temperature and pressure gas will mainly move upward rather than downward or sideways. In the case where a heat propagation blocking sheet 300 is disposed on the top of the cell stack 100 as in this embodiment, the top surface of the module case 200 can be stably protected from the high temperature and pressure gas.

[0049] Of course, the heat propagation blocking sheet 300 may be configured to cover not only the upper portion of the cell stack 100 but also other portions. For example, as shown in Fig. 4, a heat propagation blocking sheet 500 according to another embodiment of the present invention may be configured to include an upper cover surface 510 that covers the upper portion of the cell stack 100 and side cover surfaces 520 that cover both side portions of the cell stack 100. According to this embodiment, gas and flames can be blocked more reliably and firmly.

[0050] In addition, although not shown, the heat transfer blocking sheet may be disposed between the stacked pouch-type battery cells 110 to block heat transfer between the battery cells 110.

[0051] FIG. 5 is a perspective view showing a cell stack 100 to which a heat propagation blocking sheet 600 according to still another embodiment of the present invention is applied.

[0052] Meanwhile, as shown in FIG. 5, in a battery module 10 according to another embodiment of the present invention, the heat propagation blocking sheet 600 may surround the front or rear of the cell stack 100, and the electrode lead 113 of the battery cell 110 may be configured to penetrate the heat propagation blocking sheet 300.

[0053] The configuration of the battery module 10 according to yet another embodiment of the present invention includes the main configuration of the battery module 10 of the above-mentioned embodiment, but redundant descriptions of the same configurations will be omitted and a detailed description will be given focusing on the heat transmission blocking sheet 600 according to yet another embodiment of the present invention and the differences in configuration.

[0054] Referring to Figures 5 and 6, a heat propagation blocking sheet 600 according to another embodiment of the present invention includes a first cover surface 610 covering the top of the cell stack 100, and a second cover surface 620 and a third cover surface 630 covering the front and rear of the cell stack 100, respectively.

[0055] The second cover surface 620 and the third cover surface 630 include lead pull-out portions 621, 631 through which a predetermined number of electrode leads 113 can pass. For example, the lead pull-out portions 621, 631 may include sheet slits 622, 632 formed by partially cutting a region of the second cover surface 620 in the longitudinal direction as shown in FIG. 6. As shown in the partially enlarged view of FIG. 5, the electrode leads 113 may be sandwiched between the sheet slits 622, 632 and pulled out to the outside of the second cover surface 620 (or the third cover surface 630). The electrode leads 113 (see FIG. 3) pulled out to the outside of the second cover surface 620 in this manner may pass through the frame slots of the bus bar frame 410 and be welded to the bus bar 420 as in the above-described embodiment. On the other hand, in the embodiment of FIG. 5, one electrode lead 113 is sandwiched between one sheet slit 622, 632. However, unlike this embodiment, two or more electrode leads 113 may be stacked and sandwiched between one sheet slit 622, 632, and the spacing between the sheet slits 622, 632 may also be configured in various ways.

[0056] Also, the second cover surface 620 and the third cover surface 630 may have folds as indicated by "FL" in FIG. 6. The second cover surface 620 and the third cover surface 630 may be configured to be easily folded along the folds relative to the first cover surface 610. The folds may be multiple. For example, a first fold may be provided at the boundary between the first cover surface 610 and the second cover surface 620, and a second fold may be provided at a position spaced apart from the first fold by a predetermined distance. According to the above configuration, the second cover surface 620 may be folded along the first fold relative to the first cover surface 610, and the lower part of the second fold may be further folded along the second fold relative to the upper part. In this case, the second cover surface 620 may be brought into closer contact with the front part of the cell stack 100, and the electrode lead 113 may be drawn out to the outside of the second cover surface 620.

[0057] Also, the sheet slits 622, 632 of the second cover surface 620 and the sheet slits 622, 632 of the third cover surface 630 may be configured to be sealed after sandwiching the electrode lead 113. For example, as in the embodiment of FIG. 7, a fireproof tape 640 may be attached to the outside of the sheet slits 622, 632 in which the electrode lead 113 is sandwiched. The sheet slits 622, 632 may be formed slightly larger than the electrode lead 113 in order to easily sandwich the electrode lead 113. The sheet slits 622, 632 have gaps after sandwiching the electrode lead 113. The fireproof tape 640 serves to eliminate the gaps so that the sheet slits 622, 632 in which the electrode lead 113 is sandwiched are completely sealed. When the sheet slits 622, 632 are sealed with the fireproof tape 640 in this manner, it is possible to prevent gas or flame from leaking through the gaps of the sheet slits 622, 632. Furthermore, since the fire-resistant tape 640 plays a role in holding the sheet slits 622, 632, the sheet slits 622, 632 are less likely to open or break even when gas pressure acts on them.

[0058] FIG. 8 is a diagram illustrating an example of gas or flame blocking of a heat propagation blocking sheet 300 according to yet another embodiment of the present invention, and FIG. 9 is a cross-sectional view showing a schematic portion of a battery module 10 according to yet another embodiment of the present invention.

[0059] According to the configuration of the heat propagation blocking sheet 600 as described above, it is possible not only to block gas or flame from proceeding upward from the cell stack 100 as shown by K1 in FIG. 8, but also to block gas or flame from proceeding forward or backward from the cell stack 100 where the electrode lead 113 and bus bar are located as shown by K2 and K3.

[0060] As described above, the cell stack 100 is provided at its front or rear with an end cover 220 for preventing the electrode leads 113 and the busbars from being exposed to the outside. The end cover 220 is made of an electrically insulating and non-metallic material and has a part that is partially cut or perforated to provide a connector mounting port or a module terminal, and is therefore vulnerable to high-temperature gas and fire. However, in the case of the battery module 10 according to the present invention, as shown in FIG. 9, the front part of the cell stack 100 is surrounded by the second cover surface 620 of the heat propagation blocking sheet 600. Therefore, even if a thermal event occurs in the battery cell 110, the end cover 220 and the busbar frame 410 can be prevented from melting and disappearing due to high-temperature gas and fire.

[0061] As described above, the configuration of the battery module 10 according to the present invention and the operation of the configuration can prevent the sudden collapse of the structure of the battery module 10 even if a thermal event occurs inside the battery module 10 and gas or flames are emitted from the battery cells 110. In addition, by preventing the sudden collapse of the structure of the battery module 10 in which a thermal event has occurred, a chain reaction of thermal runaway in other surrounding battery modules 10 can be suppressed.

[0062] Meanwhile, a battery pack according to the present invention may include one or more of the above-mentioned battery modules 10, as shown in Fig. 10. The battery pack 1 according to the present invention may further include a pack case 20 for accommodating the above-mentioned components, such as a master BMS 30 for integrating and controlling charging and discharging of the one or more battery modules 10, a current sensor, a fuse, etc. The pack case may include a pack tray having an internal space partitioned by cross beams 21 and 22, and a pack cover for covering an upper portion of the pack tray.

[0063] The battery pack according to the present invention can be applied in an energy storage device or in a vehicle such as an electric scooter, an electric vehicle or a hybrid vehicle.

[0064] Although the preferred embodiments of the present invention have been illustrated and described above, it is to be understood that the present invention is not limited to the specific preferred embodiments described above, and that various modifications can be made by anyone having ordinary skill in the art to which the invention pertains without departing from the spirit of the present invention as claimed in the claims.

[0065] In this specification, terms indicating directions such as up, down, left, right, front, and back are used, but it will be obvious to those skilled in the art that such terms are used merely for convenience of explanation and may vary depending on the position of the object of interest, the position of the observer, etc. [Explanation of symbols]

[0066] 1 Battery Pack 10 Battery Module 20 pack case 21, 22 Cross beam 32 Sheet slit 100 Cell stack 110 Battery Cell 112 Sealing part 113 Electrode Lead 120 Compressible Pad 200 module case 210 Case body 220 End cover 300 Heat transmission blocking sheet 400 Busbar Assembly 410 Busbar Frame 420 Busbar 500 Heat transmission blocking sheet 510 Upper cover surface 520 Side cover surface 600 Heat transmission blocking sheet 610 First cover surface 620 Second cover surface 621, 631 Lead outlet 622, 632 Sheet slit 630 Third cover surface 640 Fireproof Tape

Claims

1. A cell stack including a plurality of battery cells stacked in one direction; A module case that houses the cell stack; a heat propagation blocking sheet formed of a heat resistant material and surrounding at least a portion of the cell stack inside the module case.

2. The battery module according to claim 1 , wherein the heat propagation blocking sheet includes a silicone polymer that is ceramified by heat.

3. The cell stack includes a plurality of pouch-type battery cells stacked horizontally, 2. The battery module according to claim 1, wherein the heat propagation blocking sheet is provided to cover at least one of an upper portion, a lower portion, a left side portion, a right side portion, a front portion, and a rear portion of the cell stack.

4. The battery module according to claim 3 , wherein the heat propagation blocking sheet is provided between the stacked pouch-type battery cells.

5. The heat propagation blocking sheet is A first cover surface that covers an upper portion of the cell stack; The battery module according to claim 3 , further comprising a second cover surface and a third cover surface respectively covering a front portion and a rear portion of the cell stack.

6. The second cover surface and the third cover surface are The battery module according to claim 5 , further comprising a lead pull-out portion through which electrode leads of the pouch-type battery cells pass.

7. The battery module according to claim 6, wherein the lead pull-out portion includes a sheet slit that is partially cut to sandwich a predetermined number of the electrode leads.

8. The battery module according to claim 7, wherein the sheet slit, in which the electrode lead is sandwiched, is sealed by attaching a fireproof tape to the sheet slit.

9. The module case includes: a case body configured to surround an upper portion, a lower portion, a left portion, and a right portion of the cell stack, except for a front portion and a rear portion where electrode leads of the battery cells are located; The battery module according to claim 1 , further comprising: end covers coupled to the case body and covering front and rear ends of the cell stack.

10. The heat propagation blocking sheet surrounds the front or rear of the cell stack, The battery module according to claim 9 , wherein the electrode leads of the battery cells are configured to penetrate the heat propagation blocking sheet.

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

12. A motor vehicle comprising the battery pack according to claim 11.

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