Battery pack

Abstract

A battery pack is disclosed. The battery pack according to an embodiment of the present invention may comprise: a base plate having flow paths therein; a plurality of battery cells positioned on the base plate; and partition walls installed on the upper surface of the base plate and provided with interior spaces communicating with the flow paths.

Description

battery pack

[0001] The present invention relates to a battery pack.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0044900, filed April 2, 2024, the entire disclosure of which is incorporated herein by reference.

[0003] As demand for portable electronic products such as laptops, video cameras, and mobile phones rapidly increases and the commercialization of robots and electric vehicles becomes more widespread, research into high-performance secondary batteries capable of repeated charging and discharging is actively underway.

[0004] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0005] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0006] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] Recently, secondary batteries have been widely used for power and energy storage, not only in small devices like portable electronic devices but also in medium- to large-sized devices like electric vehicles and energy storage systems (ESS). Multiple secondary batteries can be electrically connected and housed within a module case to form a single battery module. Furthermore, multiple such battery modules can be connected to form a single battery pack.

[0008] However, when multiple secondary batteries (battery cells) or battery modules are densely packed in a confined space, they can be vulnerable to thermal events. Specifically, if a thermal runaway event occurs in a single battery cell, high-temperature gases, flames, and heat can be generated. If these gases, flames, or heat are transferred to other battery cells within the same battery module, an explosive chain reaction, such as thermal propagation, can occur. This chain reaction can not only cause a fire or explosion in the battery module in question, but can also trigger fires or explosions in other battery modules.

[0009] Moreover, for medium- to large-sized battery packs, such as those used in electric vehicles, the risk of thermal chain reactions can be even greater due to the inclusion of a large number of battery cells and battery modules to increase output and / or capacity. Furthermore, battery packs installed in electric vehicles may be surrounded by users, such as drivers. Therefore, if a thermal event occurring in a specific battery cell or module is not properly controlled and a chain reaction occurs, it can result in significant property damage and even human casualties. Therefore, it is necessary to appropriately control thermal events occurring in battery cells or modules to improve the thermal safety of battery packs.

[0010] The present invention aims to solve the above-mentioned problems and other problems.

[0011] Another object of the present invention may be to provide a battery pack with improved safety when a thermal event occurs.

[0012] Another object of the present invention may be to directly inject cooling fluid into a battery module when a thermal event occurs.

[0013] Another object of the present invention may be to inject cooling fluid at each occurrence point when a thermal event occurs at multiple points.

[0014] Another object of the present invention may be to provide a battery pack capable of maintaining high pressure while cooling fluid is sprayed.

[0015] In order to achieve the above-described purpose, a battery pack according to one embodiment of the present invention may include a base plate having a flow path therein; a plurality of battery cells positioned on the base plate; and a partition wall installed on an upper surface of the base plate and having an internal space communicating with the flow path.

[0016] In addition, the partition wall may include: an injection hole connecting the inner space and the outside; and a cap blocking the injection hole.

[0017] In addition, the injection holes may be provided in multiple numbers, and the multiple injection holes may be arranged along the longitudinal direction of the partition wall.

[0018] Additionally, the cap may have screw threads on its circumferential surface.

[0019] Additionally, the partition wall may further include a first sealing member disposed around the perimeter of the injection hole.

[0020] Additionally, the cap may be configured to open the injection hole when a thermal event occurs from the plurality of battery cells.

[0021] Additionally, the base plate may further include a port provided on the upper surface and communicating with the euro.

[0022] Additionally, the port can be inserted into the inner space of the partition wall.

[0023] Additionally, the base plate may further include a second sealing member disposed around the port.

[0024] Additionally, the port may have screw threads on its peripheral surface.

[0025] Additionally, the battery pack may further include a fastening member penetrating the base plate and inserted into the partition wall.

[0026] Additionally, the internal space of the partition wall may include: a first sub-flow extending in the vertical direction; and a second sub-flow extending in communication with the first sub-flow and along the longitudinal direction of the partition wall.

[0027] Additionally, the battery pack may further include a third sub-euro extending in the vertical direction and communicating with the second sub-euro in the internal space of the partition wall.

[0028] Additionally, the internal space of the partition wall may include: a fourth sub-flow extending along the longitudinal direction of the partition wall; and a fifth sub-flow extending in an up-down direction and connected to the fourth sub-flow.

[0029] In addition, the battery pack further includes a module case installed on the upper surface of the base plate and providing a space therein, and the plurality of battery cells can be accommodated inside the module case.

[0030] A vehicle according to one aspect of the present invention comprises a battery pack of the present invention.

[0031] According to at least one of the embodiments of the present invention, the thermal safety of a battery pack can be improved.

[0032] According to at least one of the embodiments of the present invention, heat propagation can be suppressed.

[0033] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0034] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0035] Fig. 2 is a diagram showing a partial configuration of the battery pack of Fig. 1 in isolation.

[0036] Figure 3 is a drawing showing the battery module of the battery pack of Figure 2 separated.

[0037] Fig. 4 is a drawing showing a part of the configuration of the battery pack of Fig. 1.

[0038] Fig. 5 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Fig. 4.

[0039] Fig. 6 is a drawing showing a part of the configuration of the battery pack of Fig. 1.

[0040] Figure 7 is a drawing showing the configuration of Figure 6 combined.

[0041] Fig. 8 is a drawing showing a cross-sectional configuration along the cutting line B-B' of Fig. 7.

[0042] Fig. 9 is a drawing showing a modified embodiment of Fig. 8.

[0043] Fig. 10 is a drawing showing a part of the configuration of the battery pack of Fig. 1.

[0044] Figure 11 is a drawing showing the configuration of Figure 10 combined.

[0045] Fig. 12 is a drawing showing a cross-sectional configuration along the cutting line C-C' of Fig. 11.

[0046] Fig. 13 is a drawing showing a cross-sectional configuration along the cutting line D-D' of Fig. 1.

[0047] Figure 14 is an enlarged view of part E of Figure 13.

[0048] Figure 15 is an enlarged view of part E of Figure 13 when a thermal event occurs.

[0049] Figure 16 is an enlarged view of part F of Figure 13.

[0050] Figure 17 is an enlarged view of part F of Figure 13 when a thermal event occurs.

[0051] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0052] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0053] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack of FIG. 1 in isolation. FIG. 3 is a drawing showing a battery module (200, 201, 202, 203, 204) of the battery pack of FIG. 2 in isolation.

[0054] Referring to FIGS. 1 to 3, a battery pack according to an embodiment of the present invention may include a base plate (110) and a plurality of battery cells (220).

[0055] The base plate (110) may have a square shape. The base plate (110) may have a flat shape. The base plate (110) may form the exterior of the battery pack. The base plate (110) may provide an internal space (410) of the battery pack.

[0056] A plurality of battery modules (200, 201, 202, 203, 204) may be provided. The battery modules (200, 201, 202, 203, 204) may be installed, fastened, combined, fixed, or attached to the upper surface of the base plate (110).

[0057] A plurality of battery modules (200, 201, 202, 203, 204) may be provided. Each battery module (200, 201, 202, 203, 204) may include a module case (210), a battery cell (220), an end cover (230), and a heat conducting member (240). The module case (210) may have a rectangular parallelepiped shape. The module case (210) may have a shape in which the left side and the right side are open. The module case (210) may form the exterior of the battery module (200, 201, 202, 203, 204). The module case (210) may provide a space therein.

[0058] The battery cell (220) may be accommodated inside the module case (210). The battery cell (220) may be provided in multiples. In this case, the battery cell (220) may refer to a secondary battery. In addition, the battery cell (220) may have a pouch shape. The plurality of battery cells (220) may be stacked or arranged in the front-back direction.

[0059] The thermally conductive member (240) may be positioned between the plurality of battery cells (220) and the module case (210). The thermally conductive member (240) may be positioned below the plurality of battery cells (220). The thermally conductive member (240) may be formed of resin. In addition, the thermally conductive member (240) may fix the plurality of battery cells (220) to the module case (210). In addition, the thermally conductive member (240) may transfer heat generated from the plurality of battery cells (220) to the module case (210).

[0060] The end covers (230) may be provided as a pair. The pair of end covers (230) may be coupled, fastened, fixed, or attached to the left and right sides of the module case (210), respectively. The end covers (230) may form the exterior of the battery module (200, 201, 202, 203, 204).

[0061] Referring to FIGS. 1 to 3, a battery pack according to one embodiment of the present invention may include a side wall (120) and a pack cover (150).

[0062] The side wall (120) can be installed, fastened, joined, fixed, or attached to the upper surface of the base plate (110). The side wall (120) can be composed of four pieces. The side wall (120) can be arranged along the perimeter of the base plate (110). The side wall (120) can form the exterior of the battery pack. The side wall (120) can provide an internal space.

[0063] The battery modules (200, 201, 202, 203, 204) may be surrounded by a side wall (120).

[0064] The pack cover (150) may have a square plate shape. The pack cover (150) may have a flat plate shape. The pack cover (150) may form the exterior of the battery pack. The pack cover (150) may cover the internal space of the battery pack. The pack cover (150) may be installed, fastened, combined, fixed, or attached to the side wall (120). In addition, the pack cover (150) may cover the upper surface of the battery module (200, 201, 202, 203, 204).

[0065] Fig. 4 is a drawing showing a part of the configuration of the battery pack of Fig. 1. Fig. 5 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Fig. 4.

[0066] Referring to FIGS. 1 to 5, a battery pack according to one embodiment of the present invention may include partition walls (400, 401, 402, 403, 404).

[0067] The base plate (110) may have a flow path (111) therein. At this time, the flow path (111) may be referred to as a base flow path (111). At this time, the base plate (110) may also be referred to as a heat sink (110).

[0068] Partition walls (400, 401, 402, 403, 404) may be provided in multiple numbers. Partition walls (400, 401, 402, 403, 404) may be installed, fastened, fixed, combined, or attached to the upper surface of the base plate (110). Partition walls (400, 401, 402, 403, 404) may partition an internal space (410) of the battery pack. Battery modules (200, 201, 202, 203, 204) may be positioned in the spaces partitioned by the partition walls (400, 401, 402, 403, 404), respectively. Additionally, the partition walls (400, 401, 402, 403, 404) can face at least one side of the battery modules (200, 201, 202, 203, 204).

[0069] The partition walls (400, 401, 402, 403, 404) may have a space (410) therein. The internal space (410) of the partition walls (400, 401, 402, 403, 404) may be connected to the base passage (111). The internal space (410) may also be referred to as a digestion tank (410) or a digestion passage (410).

[0070] The cooling fluid (e) can flow through the base passage (111). In addition, the cooling fluid (e) can be introduced and stored in the internal space (410) of the partition walls (400, 401, 402, 403, 404). The cooling fluid (e) may also be referred to as a cooling liquid (e), a cooling gas (e), an extinguishing fluid (e), or an extinguishing member (e). For example, the cooling fluid (e) may be an insulating oil.

[0071] According to this configuration of the present invention, the thermal safety of the battery pack can be improved. When a thermal event occurs from the battery module (200, 201, 202, 203, 204) or the battery cell (220), the cooling fluid (e) stored in the internal space (410) of the partition wall (400, 401, 402, 403, 404) can be supplied, sprayed, or injected into the battery module (200, 201, 202, 203, 204) or the battery cell (220). As a result, heat transfer can be suppressed or blocked. In addition, the cooling efficiency of the battery pack can be improved. In addition, the cooling fluid (e) can function as a fire extinguishing member.

[0072] Referring to FIGS. 1 to 5, a battery pack according to one embodiment of the present invention may include a second port (114) and a center wall (300).

[0073] A second port (114) may be provided on the base plate (110). The second ports (114) may be provided in pairs. Cooling fluid (e) may flow into and out of the base passage (111) through the second port (114).

[0074] The center wall (300) can be installed, fastened, fixed, joined, or attached to the upper surface of the base plate (110). The center wall (300) can partition the internal space (410) of the battery pack. A plurality of partition walls (400, 401, 402, 403, 404) can be arranged in each space partitioned by the center wall (300).

[0075] Referring to FIGS. 1 to 5, a battery pack according to an embodiment of the present invention may include a fastening member (160). The fastening member (160) may penetrate the base plate (110). In addition, the fastening member (160) may be inserted into a partition wall (400, 401, 402, 403, 404). The fastening member (160) may fasten the base plate (110) and the partition wall (400, 401, 402, 403, 404). The fastening member (160) may be provided in multiple numbers. The multiple fastening members (160) may be arranged along the longitudinal direction of the partition wall (400, 401, 402, 403, 404). Additionally, the fastening member (160) can be fastened to a location where the internal space (410) of the partition wall (400, 401, 402, 403, 404) is not formed.

[0076] According to this configuration of the present invention, the rigidity of the battery pack can be improved.

[0077] Fig. 6 is a drawing showing a partial configuration of the battery pack of Fig. 1. Fig. 7 is a drawing showing the configuration of Fig. 6 combined. Fig. 8 is a drawing showing a cross-sectional configuration taken along the cutting line B-B' of Fig. 7. Fig. 9 is a drawing showing a modified embodiment of Fig. 8.

[0078] Referring to FIGS. 6 to 9, partition walls (400, 401, 402, 403, 404) of a battery pack according to an embodiment of the present invention may include an injection hole (420) and a cap (430). The injection hole (420) may connect the internal space (410) of the partition wall (400, 401, 402, 403, 404) with the exterior of the partition wall (400, 401, 402, 403, 404). The injection hole (420) may be provided in multiple numbers. The multiple injection holes (420) may be positioned along the longitudinal direction of the partition wall (400, 401, 402, 403, 404). The injection holes (420) may be formed on the front or rear of the partition walls (400, 401, 402, 403, 404). The first partition wall (401) may have a plurality of injection holes (420) on the rear. The second partition wall (402), the third partition wall (403), and the fourth partition wall (404) may have a plurality of injection holes (420) on the front and rear, respectively.

[0079] The cap (430) can block the injection hole (420). The cap (430) can be provided for each injection hole (420). The cap (430) can seal the injection hole (420).

[0080] According to this configuration of the present invention, the thermal safety of the battery pack can be improved. When a thermal event occurs from the battery module (200, 201, 202, 203, 204) or the battery cell (220), the cooling fluid (e) stored in the internal space (410) of the partition wall (400, 401, 402, 403, 404) can be supplied, sprayed, or injected into the battery module (200, 201, 202, 203, 204) or the battery cell (220) through the injection hole (420). In addition, the cap (430) can seal the injection hole (420) until the thermal event occurs.

[0081] Referring to FIGS. 6 to 9, a cap (430) of a battery pack according to an embodiment of the present invention may be configured to open an injection hole (420) when a thermal event occurs. When a thermal event occurs from a plurality of battery cells (220) or battery modules (200, 201, 202, 203, 204), venting gas, flames, or ignitable particles may be discharged. The cap (430) may be composed of a material that can melt at low temperatures. For example, the cap (430) may include an alloy material having a melting point between 60 and 100 degrees Celsius. Alternatively, the cap (430) may include a thermoplastic material having a melting point between 60 and 100 degrees Celsius.

[0082] According to this configuration of the present invention, the thermal safety of the battery pack can be improved. When a thermal event occurs from the battery module (200, 201, 202, 203, 204) or the battery cell (220), the cap (430) may melt or be damaged, and the injection hole (420) may be opened. As a result, the cooling fluid (e) may be injected into the battery cell (220) or battery module (200, 201, 202, 203, 204) where the thermal event occurred through the injection hole (420). Depending on the type of thermal event, a plurality of caps (430) may melt, and the cooling fluid (e) may be injected through a plurality of injection holes (420).

[0083] Referring to FIGS. 6 to 9, a plurality of injection holes (420) of a battery pack according to an embodiment of the present invention may be positioned along the longitudinal direction of the partition walls (400, 401, 402, 403, 404). In addition, the plurality of injection holes (420) may be arranged along the height direction of the partition walls (400, 401, 402, 403, 404). In addition, a cap (430) may be provided for each injection hole (420).

[0084] According to this configuration of the present invention, the thermal safety of the battery pack can be improved. By arranging multiple injection holes (420) at various locations, the cap (430) at the part where a thermal event occurs can be melted, and the extinguishing effect can be improved by spraying a cooling fluid (e) at that part.

[0085] Referring to FIGS. 8 and 9, the cap (430) of the battery pack according to one embodiment of the present invention may include a first cap (431) or a second cap (432). The cap (430) may be used as a general term for the first cap (431) and the second cap (432). The first cap (431) may include screw threads on its circumferential surface. In addition, the injection hole (420) may include screw threads on its circumferential surface. The screw threads of the first cap (431) and the screw threads of the injection hole (420) may be interlocked.

[0086] According to this configuration of the present invention, the bonding property of the cap (430) and the partition walls (400, 401, 402, 403, 404) can be improved. As a result, the sealing property of the first cap (431) can be improved.

[0087] Referring to FIG. 8, a battery pack according to an embodiment of the present invention may include a first sealing member (433). The first sealing member (433) may be arranged along the perimeter of the injection hole (420). The first sealing member (433) may include an elastic material. In addition, the first sealing member (433) may have a ring shape.

[0088] According to this configuration of the present invention, the sealing property of the first cap (431) can be improved.

[0089] Referring to FIG. 9, the second cap (432) of the battery pack according to one embodiment of the present invention may have a diameter (D2) larger than the diameter (D1) of the injection hole (420). In this case, the second cap (432) may include an elastic material. The second cap (432) may be force-fitted into the injection hole (420).

[0090] According to this configuration of the present invention, the sealing property of the second cap (432) can be improved.

[0091] Fig. 10 is a drawing showing a part of the configuration of the battery pack of Fig. 1. Fig. 11 is a drawing showing the configuration of Fig. 10 combined. Fig. 12 is a drawing showing a cross-sectional configuration taken along the cutting line C-C' of Fig. 11.

[0092] Referring to FIGS. 10 to 12, the base plate (110) of the battery pack according to one embodiment of the present invention may further include a first port (112) provided on the upper surface and communicating with the base euro (111).

[0093] The first port (112) may be formed integrally with the base plate (110). In addition, a plurality of first ports (112) may be provided. A plurality of first ports (112) may be provided in a one-to-one correspondence with each partition wall (400, 401, 402, 403, 404). The first port (112) may be coupled with the partition wall (400, 401, 402, 403, 404) or the inlet hole (410a).

[0094] According to this configuration of the present invention, the bonding between the base plate (110) and the partition walls (400, 401, 402, 403, 404) can be improved. As a result, the connectivity between the base euro (111) and the internal space (410) can be improved.

[0095] Referring to FIGS. 10 to 12, the first port (112) of the battery pack according to one embodiment of the present invention may be inserted into the internal space (410) of the partition wall (400, 401, 402, 403, 404). Alternatively, the first port (112) may be inserted into the inlet hole (410a) of the partition wall (400, 401, 402, 403, 404).

[0096] According to this configuration of the present invention, the bonding between the base plate (110) and the partition walls (400, 401, 402, 403, 404) can be improved. As a result, the connectivity between the base euro (111) and the internal space (410) can be improved.

[0097] Referring to FIGS. 10 to 12, the first port (112) of the battery pack according to one embodiment of the present invention may include screw threads on its circumferential surface. Additionally, the inlet hole (410a) may include screw threads on its circumferential surface. The screw threads of the first port (112) and the screw threads of the inlet hole (410a) may be interlocked.

[0098] According to this configuration of the present invention, the bonding between the base plate (110) and the partition walls (400, 401, 402, 403, 404) can be improved. As a result, the sealing between the first port (112) and the inlet hole (410a) can be improved.

[0099] Referring to FIGS. 10 to 12, a battery pack according to an embodiment of the present invention may include a second sealing member (113). The second sealing member (113) may be arranged along the perimeter of the inlet hole (410a) or the perimeter of the first port (112). The second sealing member (113) may include an elastic material. In addition, the second sealing member (113) may have a ring shape.

[0100] According to this configuration of the present invention, the sealing between the first port (112) and the inlet hole (410a) can be improved.

[0101] Referring to FIGS. 10 to 12, the internal space (410) of the partition walls (400, 401, 402, 403, 404) of the battery pack according to one embodiment of the present invention may include a first sub-flow path (411) and a second sub-flow path (412). The first sub-flow path (411) may be in communication with the inlet hole (410a). The first sub-flow path (411) may extend in the vertical direction, along the height direction of the partition walls (400, 401, 402, 403, 404), or along the Z-axis direction. And the second sub-flow path (412) may be in communication with the first sub-flow path (411). The second sub-flow path (412) may extend from the upper end of the first sub-flow path (411). The second sub-euro (412) can extend in the left-right direction, along the length direction of the partition wall (400, 401, 402, 403, 404), or along the Y-axis direction.

[0102] According to this configuration of the present invention, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) extends in the vertical direction or the left-right direction, the injection holes (420) can be arranged in various positions. In addition, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) is composed of a plurality of sub-channels, the pressure of the cooling fluid (e) can be maintained high.

[0103] Referring to FIGS. 10 to 12, the internal space (410) of the partition walls (400, 401, 402, 403, 404) of the battery pack according to one embodiment of the present invention may include a third sub-flow path (413). The third sub-flow path (413) may be in communication with the second sub-flow path (412). The third sub-flow path (413) may extend from the bottom of the second sub-flow path (412). The third sub-flow path (413) may extend in the vertical direction, in the height direction of the partition walls (400, 401, 402, 403, 404), or along the Z-axis direction.

[0104] According to this configuration of the present invention, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) extends in the vertical direction or the left-right direction, the injection holes (420) can be arranged in various positions. In addition, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) is composed of a plurality of sub-channels, the pressure of the cooling fluid (e) can be maintained high.

[0105] Referring to FIGS. 10 to 12, the internal space (410) of the partition walls (400, 401, 402, 403, 404) of the battery pack according to one embodiment of the present invention may include a fourth sub-flow path (414) and a fifth sub-flow path (415). The fourth sub-flow path (414) may be in communication with the third sub-flow path (413). The fourth sub-flow path (414) may extend in the vertical direction, along the height direction of the partition walls (400, 401, 402, 403, 404), or along the Z-axis direction. The fourth sub-flow path (414) may extend from the right end of the third sub-flow path (413).

[0106] The fifth sub-euro (415) may be connected to the fourth sub-euro (414). The fifth sub-euro (415) may extend from the top of the fourth sub-euro (414). The fifth sub-euro (415) may extend in the vertical direction, in the height direction of the partition walls (400, 401, 402, 403, 404), or along the Z-axis direction.

[0107] According to this configuration of the present invention, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) extends in the vertical direction or the left-right direction, the injection holes (420) can be arranged in various positions. In addition, since the internal space (410) of the partition walls (400, 401, 402, 403, 404) is composed of a plurality of sub-channels, the pressure of the cooling fluid (e) can be maintained high.

[0108] Referring to FIGS. 10 to 12, the internal space (410) of the partition walls (400, 401, 402, 403, 404) of the battery pack according to one embodiment of the present invention may be configured such that the first sub-channel (411) to the fifth sub-channel (415) are repeatedly connected. In addition, the hole through which the internal space (410) of the partition walls (400, 401, 402, 403, 404) communicates with the outside may be configured such that the inlet hole (410a) is the only hole. As a result, the cooling fluid (e) located in the internal space (410) may not flow.

[0109] According to this configuration of the present invention, the internal space (410) of the partition walls (400, 401, 402, 403, 404) can be extended in the vertical or left-right direction, so that the injection holes (420) can be positioned at various positions. In addition, the pressure of the cooling fluid (e) located in the internal space (410) of the partition walls (400, 401, 402, 403, 404) can be maintained high. As a result, when a thermal event occurs, the cooling fluid (e) can be quickly discharged.

[0110] Fig. 13 is a drawing showing a cross-sectional configuration taken along the cutting line D-D' of Fig. 1. Fig. 14 is an enlarged drawing of part E of Fig. 13. Fig. 15 is an enlarged drawing of part E of Fig. 13 when a thermal event occurs.

[0111] Referring to FIGS. 13 to 15, a first battery module (201) of a battery pack according to an embodiment of the present invention may be positioned between a first partition wall (401) and a second partition wall (402). The first partition wall (401) may include an injection hole (420) and a cap (430) on the rear side. The second partition wall (402) may include an injection hole (420) and a cap (430) on the front and rear sides, respectively. When a thermal event occurs from the first battery module (201), the cap (430) of the first partition wall (401) or the second partition wall (402) may open the injection hole (420). As a result, a cooling fluid (e) located in the internal space (410) may be sprayed into the first battery module (201).

[0112] Fig. 16 is an enlarged view of part F of Fig. 13. Fig. 17 is an enlarged view of part F of Fig. 13 when a thermal event occurs.

[0113] Referring to FIGS. 13, 16, and 17, a second battery module (202) of a battery pack according to an embodiment of the present invention may be positioned between a second partition wall (402) and a third partition wall (403). The third partition wall (403) may include an injection hole (420) and a cap (430) on the front and rear sides, respectively. When a thermal event occurs from the second battery module (202), the cap (430) of the second partition wall (402) or the third partition wall (403) may open the injection hole (420). As a result, a cooling fluid (e) located in the internal space (410) may be sprayed into the second battery module (202).

[0114] In addition, the battery pack according to the present invention may further include various components, for example, components of a battery pack known at the time of filing of the present invention, such as a BMS, a bus bar, a relay, a current sensor, etc.

[0115] A vehicle according to the present invention may include the battery pack according to the present invention described above. The battery pack according to the present invention may be applied to vehicles such as electric vehicles or hybrid vehicles. Furthermore, in addition to the battery pack, the vehicle according to the present invention may further include various other components included in the vehicle, such as a body, a motor, and control devices such as an electronic control unit (ECU).

[0116] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back are used in this specification, it is obvious to those skilled in the art that these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0117] As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and various modifications and variations are possible by a person having ordinary skill in the art to which the present invention pertains within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below.

Claims

1. A base plate having a euro inside; A plurality of battery cells positioned on the base plate; and A battery pack including a partition wall installed on the upper surface of the base plate and having an internal space communicating with the euro.

2. In paragraph 1, The above partition wall is: An injection hole connecting the internal space and the outside; and A battery pack including a cap blocking the above injection hole.

3. In paragraph 2, The above injection holes are provided in multiple numbers, A battery pack wherein the plurality of injection holes are arranged along the length direction of the partition wall.

4. In paragraph 2, The above cap is, A battery pack having a screw thread on its circumferential surface.

5. In paragraph 2, The above partition wall is, A battery pack further comprising a first sealing member disposed around the injection hole.

6. In paragraph 2, The above cap is, A battery pack configured to open the injection hole when a thermal event occurs from the plurality of battery cells.

7. In paragraph 1, The above base plate, A battery pack further comprising a port provided on the upper surface and communicating with the euro.

8. In paragraph 7, The above port is, A battery pack inserted into the inner space of the above partition wall.

9. In paragraph 7, The above base plate, A battery pack further comprising a second sealing member disposed around the port.

10. In paragraph 7, The above port is, A battery pack having a screw thread on its circumferential surface.

11. In paragraph 1, A battery pack further comprising a fastening member penetrating the base plate and inserted into the partition wall.

12. In paragraph 1, The interior space of the above partition wall is: A first sub-euro extending in the vertical direction; and, A battery pack comprising a second sub-euro connected to the first sub-euro and extending along the length of the partition wall.

13. In paragraph 12, The internal space of the above partition wall is A battery pack further comprising a third sub-euro extending in a vertical direction and communicating with the second sub-euro.

14. In paragraph 1, The interior space of the above partition wall is: A fourth sub-euro extending along the longitudinal direction of the above partition wall; and, A battery pack including a fifth sub-euro extending in a vertical direction and communicating with the fourth sub-euro.

15. In paragraph 1, Further comprising a module case installed on the upper surface of the base plate and providing space inside, The above plurality of battery cells, A battery pack housed inside the above module case.

16. A vehicle comprising a battery pack according to any one of claims 1 to 15.

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