Battery pack

Abstract

According to exemplary embodiments, a battery pack is provided. The battery pack comprises: a base plate; first and second cross beams on the base plate; a first battery cell assembly between the first and second cross beams; and a venting structure on the first battery cell assembly, wherein the venting structure includes first and second walls and first to third plates defining first and second venting channels, the first wall overlaps the first cross beam, the second wall overlaps the second cross beam, and the second wall includes a first slit connected to the second venting channel.

Description

battery pack

[0001] The present invention relates to a battery pack. The present application claims the benefit of Korean application No. 10-2024-0163540, filed on November 15, 2024, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend for rechargeable batteries in mobility is the improvement of energy density and safety. Here, the energy density of a rechargeable battery is defined as the maximum electrical energy that can be stored by the battery's mass. As high energy density is directly linked to driving efficiency and range in mobility applications, various studies are being conducted to improve this energy density.

[0004] The problem that the technical concept of the present invention aims to solve is to provide a battery pack having enhanced safety.

[0005] According to exemplary embodiments for solving the above-described problem, a battery pack is provided. The battery pack comprises: a base plate; first and second cross beams on the base plate; a first battery cell assembly between the first and second cross beams; and a venting structure on the first battery cell assembly, wherein the venting structure comprises first to third plates and first and second walls defining first and second venting channels, wherein the first wall overlaps with the first cross beam, the second wall overlaps with the second cross beam, and the second wall includes a first slit connected to the second venting channel.

[0006] The second cross beam includes a second slit connected to the first slit.

[0007] The base plate includes a third slit connected to the second slit.

[0008] The second plate is located between the first and third plates, and the second plate includes a hole connected to each of the first and second venting channels.

[0009] The battery pack further includes a directional device installed in the hole.

[0010] The above hole is closer to the first wall than to the second wall.

[0011] The battery pack further includes bolts fastened to the first wall and the first cross beam.

[0012] The battery pack comprises a third cross beam spaced apart from the first cross beam with the second cross beam in between, and a second battery cell assembly interposed between the second and third cross beams, and a venting structure is on the second battery cell assembly.

[0013] The above venting structure includes a third wall spaced apart from the first wall with the second wall in between, and the third wall overlaps with the third cross beam.

[0014] The second plate includes a hole connected to each of the first and second venting channels, and the hole is closer to the third wall than to the second wall.

[0015] The battery pack further includes bolts fastened to the third wall and the third cross beam.

[0016] According to exemplary embodiments, a battery pack is provided. The battery pack comprises: a base plate; a battery cell assembly comprising a plurality of battery cells arranged in a first direction parallel to the mounting surface of the base plate, between the first and second cross beams; first and second cross beams on the base plate, spaced apart in the first direction with the battery cell assembly in between, and each extending in a second direction perpendicular to the first direction and parallel to the mounting surface; and a venting structure on the first battery cell assembly, wherein the venting structure comprises first to third plates and first and second walls defining first and second venting channels extending in the first direction, the first wall overlaps with the first cross beam, the second wall overlaps with the second cross beam, and the second wall includes a first slit connected to the second venting channel.

[0017] The second plate is located between the first and third plates, and the second plate includes a hole connected to each of the first and second venting channels.

[0018] The above hole is spaced apart from the above first slit in the above first direction.

[0019] According to exemplary embodiments of the present invention, when a thermal runaway event occurs in some of the battery cell assemblies, high-temperature gas is introduced into the venting structure on the battery cell assemblies, thereby preventing the high-temperature gas from being directly transferred to adjacent battery cell assemblies and enhancing the safety of the battery pack.

[0020] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0021] FIG. 1 is a plan view of a battery pack according to exemplary embodiments.

[0022] FIG. 2 is a plan view of a battery pack according to exemplary embodiments.

[0023] Figure 3 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1.

[0024] FIG. 4 is a cross-sectional view illustrating a battery pack according to other exemplary embodiments.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0026] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0027] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0028] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0029]

[0030] (1st and 2nd embodiments)

[0031] FIG. 1 is a plan view of a battery pack (100) according to exemplary embodiments.

[0032] FIG. 2 is a plan view of a battery pack (100) according to exemplary embodiments. In FIG. 2, venting structures (130) are omitted to show the relationship between the elements of the battery pack (100).

[0033] Figure 3 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1.

[0034]

[0035] Referring to FIGS. 1 to 3, the battery pack (100) may include a pack housing (110), battery cell assemblies (120), venting structures (130), and bolts (140). The battery pack (100) is the final form of a battery system mounted on mobility, etc.

[0036] The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115), a center beam (116), and cross beams (117, 118, 119). Here, two directions substantially parallel to the mounting surface (111M) of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface (111M) of the base plate (111) is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. The mounting surface (111M) of the base plate (111) may face battery cell assemblies (120).

[0037] The base plate (111) may have a flat shape. Each of the side walls (112, 113, 114, 115) may be substantially perpendicular to the base plate (111). The side walls (112, 113, 114, 115) may be adjacent to the edge portions of the base plate (111). The side walls (112, 113, 114, 115) may be joined to the edge portions of the base plate (111).

[0038] The base plate (111) can be substantially perpendicular to the Z direction. Each of the side walls (112, 113) can be substantially perpendicular to the Y direction. Each of the side walls (114, 115) can be substantially perpendicular to the Y direction.

[0039] The center beam (116) may extend in the X direction. The center beam (116) may be substantially perpendicular to the Y direction. The center beam (116) may be welded to the base plate (111). If the base plate (111) and the center beam (116) are formed by an extrusion process, the center beam (116) may be formed together with the base plate (111).

[0040] The center beam (116) can isolate the battery cell assemblies (120) in the Y direction. Some of the battery cell assemblies (120) may be between the center beam (116) and the side wall (112), and other parts of the battery cell assemblies (120) may be between the center beam (116) and the side wall (113). The center beam (116) may be between the battery cell assemblies (120) in the Y direction.

[0041] Each of the cross beams (117, 118, 119) may extend in the Y direction. Each of the cross beams (117, 118, 119) may be substantially perpendicular to the X direction. Each of the cross beams (117, 118, 119) may be fixed to the base plate (111) by means such as bolting or welding.

[0042] Cross beams (117, 118, 119) can isolate battery cell assemblies (120) in the X direction. Cross beams (118) may be located between battery cell assemblies (120) in the X direction. Each of the battery cell assemblies (120) may be located between the cross beams (117, 118) or between the cross beams (118, 119).

[0043] The cross beams (118) may be located between the cross beams (117, 119). The cross beams (119) may be spaced apart from the cross beams (117) in the X direction with the cross beams (118) in between.

[0044] Each of the cross beams (118) may have a different shape from each of the cross beams (117, 119). Each of the cross beams (118) may include slits (118SL). Each of the cross beams (117, 119) may not include slits. The cross beams (117, 119) may have the same shape as each other.

[0045] The slits (118SL) may be arranged in the Y direction. The slits (118SL) may penetrate the cross beams (118) in the Z direction. The length of each slit (118SL) in the Y direction may differ from the width of each slit (118SL) in the X direction. The length of each slit (118SL) in the Y direction may be greater than the width of each slit (118SL) in the X direction.

[0046] The base plate (111) may include slits (111SL) penetrating the base plate (111) in the Z direction. The shape and arrangement of the slits (111SL) may be substantially the same as the shape and arrangement of the slits (118SL), but are not limited thereto. Each of the slits (118SL) may overlap in the Z direction with a corresponding slit (111SL). Each of the slits (118SL) may be connected to a corresponding slit (111SL).

[0047] The center beam (116) and cross beams (117, 118, 119) may be surrounded by side walls (112, 113, 114, 115). Accordingly, the center beam (116) and cross beams (117, 118, 119) may divide the internal space of the battery pack (100) defined by the pack housing (110).

[0048]

[0049] Battery cell assemblies (120) may be on the base plate (111) of the pack housing (110). Battery cell assemblies (120) may be arranged in the X direction and the Y direction. In this example, two battery cell assemblies (120) are arranged in the X direction and two battery cell assemblies are arranged in the Y direction, so that the battery cell assemblies (120) form a matrix of 2 rows and 2 columns, but this is for illustrative purposes only and does not limit the technical concept of the invention in any sense.

[0050] The base plate (111) can support the battery cell assemblies (120). The side walls (112, 113, 114, 115) can horizontally surround the battery cell assemblies (120).

[0051] Each of the battery cell assemblies (120) may include a plurality of battery cells (121), pads (122), and a module frame (125). Hereinafter, the technical concept of the present invention is described with reference to an embodiment in which each of the battery cell assemblies (120) includes a module frame (125). However, this is a non-limiting example and does not limit the technical concept of the present invention in any sense. A person skilled in the art will be able to easily arrive at an example in which each of the battery cell assemblies (120) does not include a module frame (125) based on what is described herein.

[0052] A plurality of battery cells (121) may be arranged in the X direction. Each of the plurality of battery cells (121) may include an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells (121) may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of the pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet.

[0053] An electrode assembly includes an anode, a cathode, and a separator interposed between the anode and the cathode. A jelly roll type electrode assembly is formed by winding an anode, a cathode, and a separator interposed between them. A stack type electrode assembly includes a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are stacked sequentially.

[0054] According to exemplary embodiments, a plurality of battery cells (121) may form a plurality of banks. A plurality of banks may include one or more parallel-connected battery cells (121). A plurality of banks may be connected in series with each other. The number of battery cells (121) included in each of the plurality of banks and the number of banks connected in series with each other may be determined according to the voltage and current to be output through each of the battery cell assemblies (120).

[0055] Pads (122) may be located between multiple battery cells (121). The pads (122) may contain a compressible material and may absorb swelling of the multiple battery cells. According to exemplary embodiments, the pads (122) may be thermal barriers. According to exemplary embodiments, each of the pads (122) may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the pads (122) may contain a flame-retardant material, such as ceramic and coated glass material. According to exemplary embodiments, the pads (122) may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0056] Each of the battery cell assemblies (120) may further include a first integrated circuit assembly, second integrated circuit assemblies, and a Flexible Flat Cable (FFC) assembly. The first integrated circuit assembly may include an insulating frame, an integrated circuit, busbars, sensing plates, sensing bars, temperature sensors, wiring, and an insulating cover.

[0057] The first integrated circuit assembly may include physical and functional configurations for providing electrical connections between a plurality of battery cells (121), outputting the resulting voltage of the plurality of battery cells (121), and measuring the voltage (or current) of nodes within a circuit composed of the plurality of battery cells (121).

[0058] The insulating frame may include an insulating material such as plastic. The insulating frame of the first integrated circuit assembly may cover the front of a plurality of battery cells (121). The insulating frame may support the integrated circuit, bus bars, sensing plates, sensing bars, temperature sensors, and wiring.

[0059] The bus bars can be short-circuited to the positive leads of the battery cells (121) of the first bank and to the negative leads of one or more battery cells (121) of the last bank. The bus bars can be welded to the positive leads of the battery cells (121) of the first bank and to the negative leads of one or more battery cells (121) of the last bank. The resulting voltage of the plurality of battery cells (121) of each of the battery cell assemblies (120) can be output through the bus bars. The bus bars can be fixed to an insulating frame.

[0060] The integrated circuit can be mounted on an insulating frame. Positive leads and negative leads welded to each other can form nodes within the battery cell assemblies (120). The integrated circuit can be configured to measure the voltage of the nodes through sensing plates and sensing bars.

[0061] The sensing bars may include a conductive material. The sensing bars may have a rod shape. The sensing bars may be short-circuited to the bus bars. The sensing bars may be coupled to the bus bars. Through the sensing bars, the voltage of the bus bars can be measured.

[0062] Each of the plurality of sensing plates may have a patch shape or a pad shape. The plurality of sensing plates may include a conductive material. The plurality of sensing plates may be short-circuited to corresponding positive leads and negative leads of the plurality of battery cells (121).

[0063] Each of the multiple sensing plates can be connected to an integrated circuit. Through the multiple sensing plates, the voltage of multiple nodes within the battery cell assemblies (120) can be measured.

[0064] Temperature sensors may be configured to measure the temperature at multiple points of the battery cell assemblies (120). The temperature sensors may be spatially distributed, and accordingly, the temperature distribution within the battery cell assemblies (120) may be measured.

[0065] The insulating cover may include an insulating material such as plastic. The insulating cover may be fitted into an insulating frame. The insulating cover may cover an integrated circuit, bus bars, sensing plates, sensing bars, and temperature sensors, and accordingly, the electrical elements of the first and second integrated circuit assemblies may be protected.

[0066] The second integrated circuit assembly is generally similar to the first integrated circuit assembly, except that it does not include busbars. The second integrated circuit assembly may be spaced apart from the first integrated circuit assembly by a plurality of battery cells (121). The second integrated circuit assembly may be connected to the first integrated circuit assembly through an FFC assembly. Accordingly, measurements detected by the second integrated circuit assembly may be transmitted to the first integrated circuit assembly through the FFC assembly.

[0067] Each of the battery cell assemblies (120) may have a first integrated circuit assembly facing the center beam (116). Each of the battery cell assemblies (120) may have a second integrated circuit assembly facing the side wall (112) or the side wall (113).

[0068] Multiple battery cells (121) and pads (122) may be located within a module frame (125). The module frame (125) may include a top plate (125T) containing venting holes (125TH). The module frame (125) may be composed of a top plate (125T) and a U-shaped lower frame, or it may be an integral monoframe.

[0069]

[0070] Venting structures (130) may be on cross beams (117, 118, 119). Venting structures (130) may be on battery cell assemblies (120). Venting structures (130) may overlap in the Z direction with corresponding cross beams (117, 118, 119). Venting structures (130) may overlap in the Z direction with corresponding battery cell assemblies (120). Venting structures (130) may be fastened to cross beams (117, 119) by bolts (140). Each of the venting structures (130) may include first to third plates (131, 133, 135) and first to third walls (132, 134, 136).

[0071] Each of the first to third plates (131, 133, 135) may be substantially perpendicular to the Z direction. The second plate (133) may be located between the first and third plates (131, 135).

[0072] The first plate (131) may include holes (131H). The holes (131H) may be arranged in the X direction and the Y direction. The second plate (133) may include holes (133H). The holes (133H) may be adjacent to the first wall (132) or the third wall (136). Some of the holes (133H) may be closer to the first wall (132) than to the second wall (134). Some of the holes (133H) may be closer to the third wall (136) than to the second wall (134). The holes (133H) may be spaced apart from the slits (118SL) in the X direction.

[0073] Holes (133H) may be adjacent to the cross beam (117) or the cross beam (119). Some holes (133H) may be closer to the cross beam (117) than to the cross beam (118). Some holes (133H) may be closer to the cross beam (119) than to the cross beam (118).

[0074] The first wall (132) can overlap with the cross beam (117) in the Z direction. Each of the first and third plates (131, 135) can be connected to the first wall (132). The third wall (136) can overlap with the cross beam (119) in the Z direction. Each of the first and third plates (131, 135) can be connected to the third wall (136).

[0075] The second wall (134) may be located between the first and third walls (132, 136). The second wall (134) may overlap with the cross beam (118) in the Z direction. Each of the first and second plates (131, 133) may be connected to the second wall (134).

[0076] The second wall (134) may include slits (134SL) penetrating the second wall (134) in the Z direction. The arrangement of the slits (134SL) may be substantially the same as the arrangement of the slits (118SL), but is not limited thereto. Each of the slits (134SL) may overlap in the Z direction with a corresponding slit (118SL). Each of the slits (134SL) may be connected to a corresponding slit (118SL).

[0077] The first and second plates (131, 133) and the first to third walls (132, 134, 136) may define first venting channels (VC1) extending in the X direction. Each of the first venting channels (VC1) may be connected to holes (131H) and holes (133H).

[0078] The second and third plates (131, 133) and the first to third walls (132, 134, 136) may define second venting channels (VC2) extending in the X direction. Each of the first venting channels (VC1) may be connected to holes (133H) and slits (134SL).

[0079] Gas introduced into the first venting channels (VC1) through the holes (131H) can move to the second venting channels (VC2) through the holes (133H) and be discharged outside the battery pack (100) through the slits (134SL, 118SL, 111SL). Accordingly, each of the venting structures (130) defines a serpentine venting path composed of the first and second venting channels (VC1, VC2), so that in the event of a thermal runaway event in some of the battery cell assemblies (120), high-temperature gas can be prevented from being directly transferred to adjacent battery cell assemblies (120), and the safety of the battery pack (100) can be enhanced.

[0080] TIM layers may be further provided between each of the battery cell assemblies (120) and the base plate (111). The TIM layers may comprise a resin composition. The TIM layers may be provided by a thermal resin application process.

[0081] The battery pack (100) may further include exhaust devices. The exhaust devices may be coupled to the base plate (111). Under normal conditions, the exhaust devices may close the slits (111SL). The exhaust devices may open the slits (111SL) when at least one of the battery cell assemblies (120) is in a thermal runway state. Accordingly, high-temperature gas inside the battery pack (100) may be released to the outside, and thermal propagation may be delayed.

[0082] Here, thermal runaway of the battery cell assemblies (120) is an uncontrollable positive feedback condition in which a temperature change of the battery cell assemblies (120) further accelerates that temperature change. The battery cell assemblies (120) in a thermal runaway state exhibit a rapid temperature rise and emit large amounts of high-pressure gas and combustion residue.

[0083] The battery pack (100) may include leads coupled to side walls (112, 113, 114, 115). The leads may cover elements placed inside the battery pack (100), such as battery cell assemblies (120) and electrical components. The leads may be secured to the battery pack (100), for example, by bolting and / or welding. Each of the venting structures (130) may be integrated into the leads, but is not limited thereto. Each of the venting structures (130) may be separate elements from the leads.

[0084] The battery pack (100) may further include interbusbars. Battery cell assemblies (120) may be connected in series by the interbusbars, and the battery pack (100) may output a high voltage.

[0085] The battery pack (100) may further include electrical components. The electrical components may be placed on the pack housing (110). The electrical components may be placed between any one of the side walls (112, 113, 114, 115) where exhaust devices are installed and the battery cell assemblies (120).

[0086] Electrical components may include, for example, a BMS. The BMS may be configured to perform monitoring, balancing, and control of the battery pack. Monitoring of the battery pack (100) may include measuring the voltage and current of specific nodes within the battery cell assemblies (120) and measuring the temperature of set locations within the battery pack (100). The battery pack (100) may include sensors for measuring the voltage, current, and temperature described above.

[0087] Balancing of the battery pack (100) is an operation that reduces deviations between battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, and accordingly, the shortening of the lifespan of each battery cell assembly (120) can be prevented.

[0088] The electrical components may further include a cooling device, a Power Relay Assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan can prevent overheating of each of the battery cell assemblies (120) by circulating air inside the battery pack (100). The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the battery cell assemblies (120) and the external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in situations where abnormal voltage occurs, such as a voltage surge.

[0089]

[0090] (3rd Example)

[0091] FIG. 4 is a cross-sectional view illustrating a battery pack (100') according to other exemplary embodiments. More specifically, FIG. 4 shows a portion of the battery pack (100') corresponding to FIG. 3.

[0092] Referring to FIG. 4, the battery pack (100') may include a housing (110), battery cell assemblies (120), venting structures (130), bolts (140), and directional devices (151, 153, 155). The battery pack (100') is the final form of a battery system mounted on mobility, etc.

[0093] The housing (110), battery cell assemblies (120), venting structures (130), and bolts (140) are substantially the same as those described with reference to FIGS. 1 through 3, so a redundant description thereof is omitted.

[0094] Each of the directional devices (151) can be installed in a corresponding hole (131H, see FIG. 3). Each of the directional devices (153) can be installed in a corresponding hole (133H, see FIG. 3). Each of the directional devices (155) can be installed in a corresponding slit (118SL).

[0095] According to exemplary embodiments, each of the directional devices (151, 153, 155) may include a one-way valve or a hinged door. Accordingly, each of the directional devices (151, 153, 155) may be configured to allow gas discharged from the battery cell assemblies (120) to move in a direction of being discharged to the outside through the venting structure (130), while blocking the gas from moving in the opposite direction.

[0096]

[0097] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. Base plate; First and second cross beams on the base plate; A first battery cell assembly located between the first and second cross beams; and It includes a venting structure on the first battery cell assembly above, and The above venting structure includes first to third plates defining first and second venting channels and first and second walls, and The first wall above overlaps with the first cross beam, and The second wall above overlaps with the second cross beam, and A battery pack characterized in that the second wall includes a first slit connected to the second venting channel.

2. In Paragraph 1, A battery pack characterized in that the second cross beam includes a second slit connected to the first slit.

3. In Paragraph 1, A battery pack characterized in that the base plate includes a third slit connected to the second slit.

4. In Paragraph 1, The second plate is located between the first and third plates, and A battery pack characterized in that the second plate includes a hole connected to each of the first and second venting channels.

5. In Paragraph 4, A battery pack further comprising a directional device installed in the above hole.

6. In Paragraph 4, A battery pack characterized in that the hole is closer to the first wall than to the second wall.

7. In Paragraph 1, A battery pack further comprising bolts fastened to the first wall and the first cross beam.

8. In Paragraph 1, A third cross beam positioned on the base plate and spaced apart from the first cross beam with the second cross beam in between; and It further includes a second battery cell assembly interposed between the second and third cross beams, and A battery pack characterized in that the above venting structure is located on the above second battery cell assembly.

9. In Paragraph 8, The above venting structure includes a third wall spaced apart from the first wall with the second wall in between, and A battery pack characterized in that the third wall overlaps with the third cross beam.

10. In Paragraph 9, The second plate includes a hole connected to each of the first and second venting channels, and A battery pack characterized in that the hole is closer to the third wall than to the second wall.

11. In Paragraph 9, A battery pack further comprising bolts fastened to the third wall and the third cross beam.

12. Base plate; A battery cell assembly comprising a plurality of battery cells arranged in a first direction parallel to the mounting surface of the base plate, situated between the first and second cross beams; and First and second cross beams that are on the base plate and spaced apart in the first direction with the battery cell assembly in between, and each extend in a second direction perpendicular to the first direction and parallel to the mounting surface; and It includes a venting structure on the first battery cell assembly above, and The above venting structure includes first to third plates and first and second walls defining first and second venting channels extending in the first direction, and The first wall above overlaps with the first cross beam, and The second wall above overlaps with the second cross beam, and A battery pack characterized in that the second wall includes a first slit connected to the second venting channel.

13. In Paragraph 12, The second plate is located between the first and third plates, and A battery pack characterized in that the second plate includes a hole connected to each of the first and second venting channels.

14. In Paragraph 13, A battery pack characterized in that the above hole is spaced apart from the above first slit in the above first direction.

Images