Battery pack and vehicle comprising the same

Abstract

A battery pack according to one embodiment of the present application can include a plurality of battery cells, a battery pack case for accommodating the plurality of battery cells, a cooling plate disposed inside the battery pack case and having a cooling passage in which a cooling medium is filled and a water injection hole for discharging the cooling medium from the cooling passage toward the battery cells, and a cover member for covering the water injection hole.

Description

Technical Field

[0001] This disclosure relates to battery packs and vehicles including such battery packs.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0153774, filed with the Korean Intellectual Property Office on November 1, 2024, the disclosure of which is incorporated herein by reference in its entirety.

[0003] This application is based on and claims priority to Korean Patent Application No. 10-2025-0018126 filed with the Korean Intellectual Property Office on February 12, 2025, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0004] Secondary batteries, with their wide applicability across product categories and electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. Such secondary batteries are gaining attention as a new energy source for enhancing environmental sustainability and energy efficiency, not only because of their major advantage of significantly reducing fossil fuel use but also because they do not produce byproducts from energy use.

[0005] Currently widely used rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. When a high output voltage is required, multiple battery cells can be connected in series to form a battery module or battery pack. Furthermore, to increase charge and discharge capacity, multiple battery cells can be connected in parallel to configure a battery module or battery pack.

[0006] A common method for configuring a battery pack by connecting multiple battery cells in series or parallel is implemented by first configuring a battery module that includes at least one battery cell, and then adding other components to the at least one battery module to configure a battery pack or battery rack. Recently, cell-to-pack type battery packs have been manufactured, in which multiple battery cells are stored directly in the battery pack casing, etc., rather than being modularized.

[0007] However, when multiple battery modules are included in a battery pack, the battery pack may be susceptible to thermal cascading effects between the battery modules. For example, if an event such as thermal runaway occurs within a single battery module, that thermal runaway may propagate to other battery modules. If the propagation of thermal runaway between battery modules is not adequately controlled, an event occurring in a particular battery module may trigger a cascading effect across multiple battery modules, potentially leading to major problems such as explosions or fires.

[0008] Therefore, there is a need to develop a structure that can rapidly cool battery cells and / or battery modules in the event of an event such as thermal runaway in a battery pack or battery module. Summary of the Invention

[0009] Technical issues

[0010] This disclosure is designed to address problems in the related art, and therefore aims to provide a battery pack that can rapidly cool the battery cells and / or battery module in the event of thermal runaway in the battery module.

[0011] However, the technical problems sought to be solved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that are not mentioned above.

[0012] Technical solution

[0013] In one aspect of this disclosure, a battery pack is provided, comprising: a plurality of battery cells; a battery pack housing configured to accommodate the plurality of battery cells; a cooling plate disposed inside the battery pack housing and having cooling channels and injection holes, the cooling channels being filled with a cooling medium and the injection holes being configured to discharge the cooling medium from the cooling channels toward the battery cells; and a cover member configured to cover the injection holes.

[0014] The cover member can be configured to be at least partially inserted into the injection hole.

[0015] The cover component can be configured to open the injection port when a thermal event occurs in the battery cell.

[0016] The cover member may include: a connecting portion configured to surround the inner surface of the injection hole and having a through hole formed in the center of the connecting portion; and a cover portion configured to cover the through hole.

[0017] The connecting portion may include: a first portion configured to be inserted into a spray hole; and a second portion extending from the first portion toward one side for placement onto the inner surface of a cooling plate.

[0018] The outer surface of the second part can be configured to slope inward.

[0019] The connecting portion may include a third portion that extends from the first portion toward the other side so as to be disposed on the outer side of the inner surface of the cooling plate.

[0020] The outer surface of the third part may include a guide portion configured to guide insertion into the injection hole.

[0021] The cover can be formed in the connection by insert injection molding.

[0022] Through holes can be configured in a truncated cone shape.

[0023] The battery pack according to embodiments of the present disclosure may further include a sealing member inserted between the cover member and the inner surface of the injection hole.

[0024] The battery pack according to embodiments of the present disclosure may further include a housing configured to accommodate a plurality of battery cells and having cooling holes formed on one side for communication with injection holes.

[0025] The housing may have a vent that is configured to discharge exhaust gases generated from the battery cell to the outside.

[0026] In addition, this disclosure provides a vehicle that includes a battery pack according to this disclosure.

[0027] Beneficial effects

[0028] According to one aspect of this disclosure, when a thermal event such as thermal runaway occurs in the battery pack, the cooling medium can flow directly to the battery cells, thereby effectively preventing or delaying the propagation of thermal runaway between the battery cells. This ensures the safety and reliability of the battery pack.

[0029] Furthermore, according to the above aspects of this disclosure, the cooling medium can directly cool the battery cells, thereby ensuring the effective cooling performance of the battery pack.

[0030] Furthermore, according to another aspect of this disclosure, the cooling medium flowing to the battery cell can be appropriately drained to prevent short circuits in the normal battery cell and / or battery module.

[0031] Furthermore, according to another aspect of this disclosure, the exhaust gases generated from the battery cells can be quickly discharged to the outside of the battery pack, thereby ensuring the safe venting performance of the battery pack.

[0032] Furthermore, according to another aspect of this disclosure, during venting, the flow of fluids (such as exhaust gases or the like) to adjacent battery cells and / or battery modules can be minimized.

[0033] Furthermore, according to another aspect of this disclosure, events caused by thermal runaway (such as fire or explosion) in a battery pack comprising multiple battery modules or an apparatus equipped with multiple battery modules can be prevented or delayed.

[0034] In addition, this disclosure may have various other effects, and these effects will be described in various embodiments, or descriptions of effects that can be readily deduced by those skilled in the art will be omitted. Attached Figure Description

[0035] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0036] Figure 1 This is a perspective view of a battery pack according to an embodiment of the present disclosure.

[0037] Figure 2 This is an exploded perspective view of a battery pack according to an embodiment of the present disclosure.

[0038] Figure 3 This is a cross-sectional view of a battery pack according to an embodiment of the present disclosure, which may be along... Figure 1 The cross-sectional view taken from line I-I' in the diagram.

[0039] Figure 4 This is a bottom perspective view of a cooling plate included in a battery pack according to an embodiment of the present disclosure.

[0040] Figure 5 This is a cross-sectional view of a battery pack experiencing a thermal event according to an embodiment of this disclosure.

[0041] Figure 6 This is a perspective view of the cover member included in a battery pack according to an embodiment of the present disclosure.

[0042] Figure 7 This is a cross-sectional view showing a partial configuration of a battery pack according to an embodiment of the present disclosure.

[0043] Figure 8 This is a diagram illustrating the process of manufacturing a cover member included in a battery pack according to an embodiment of the present disclosure.

[0044] Figure 9 This is a cross-sectional view showing a partial configuration of a battery pack according to another embodiment of the present disclosure.

[0045] Figure 10 This is a cross-sectional view showing a partial configuration of a battery pack according to another embodiment of the present disclosure.

[0046] Figure 11 This is a perspective view of a battery module included in a battery pack according to an embodiment of the present disclosure.

[0047] Figure 12 This is a top view of the internal configuration of a battery pack according to an embodiment of the present disclosure.

[0048] Figure 13 This is a bottom perspective view of a battery module included in a battery pack according to an embodiment of the present disclosure.

[0049] Figure 14This is a cross-sectional view of a battery pack experiencing a thermal event according to an embodiment of this disclosure.

[0050] Figure 15 This is an enlarged cross-sectional view of a battery pack according to an embodiment of the present disclosure.

[0051] Figure 16 This is an internal perspective view of the battery pack housing included in a battery pack according to another embodiment of the present disclosure.

[0052] Figure 17 This is a schematic perspective view of a vehicle including a battery pack according to an embodiment of the present disclosure. Detailed Implementation

[0053] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but rather is interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle that inventors are allowed to appropriately define terms for the best interpretation.

[0054] Therefore, the description presented herein is merely a preferred example for illustrative purposes and does not represent the full scope of this disclosure. It should be understood that other equivalents and modifications may be made to this disclosure without departing from its scope.

[0055] Furthermore, this disclosure may include various embodiments. Repeated descriptions of substantially identical or similar configurations will be omitted from the various embodiments, and descriptions will be based on their differences.

[0056] Furthermore, although terms indicating directions such as up, down, left, right, front, and back are used in this specification, it will be apparent to those skilled in the art to which this disclosure pertains that these terms are merely for ease of interpretation with reference to the accompanying drawings and may vary depending on the position of the target object or the observer's position.

[0057] For example, in embodiments of this disclosure, the X-axis direction shown in the figure can indicate the left-right direction, the Y-axis direction can indicate the front-back direction perpendicular to the X-axis direction on the horizontal plane (XY plane), and the Z-axis direction can indicate the up-down direction (vertical direction) perpendicular to both the X-axis and Y-axis directions.

[0058] Figure 1 This is a perspective view of a battery pack according to an embodiment of the present disclosure. Figure 2 This is an exploded perspective view of a battery pack according to an embodiment of the present disclosure. Furthermore, Figure 3 This is a cross-sectional view of a battery pack according to an embodiment of the present disclosure, which may be along... Figure 1 The cross-sectional view taken from line I-I' in the diagram.

[0059] Reference Figures 1 to 3 According to embodiments of the present disclosure, the battery pack 1 may include a battery cell 100, a battery pack housing 200, a cooling plate 300, and a cover member 400.

[0060] Reference Figure 2 The system may include multiple battery cells 100. Furthermore, although not shown in the figures, the multiple battery cells 100 may include electrode assemblies, a cell housing housing the electrode assemblies, and electrode leads connected to the electrode assemblies and extending outward from the cell housing to serve as electrode terminals. In this configuration, the multiple battery cells 100 may be electrically connected to each other.

[0061] Multiple battery cells 100 can be stacked in at least one direction. For example, as Figure 2 As shown, multiple battery cells 100 can be arranged side by side in the front-to-back direction (X-axis direction) and upright in the vertical direction (Z-axis direction).

[0062] Furthermore, this disclosure is not limited to a specific type or shape of the battery cell 100, and various battery cells 100 known at the time of filing of this disclosure can be applied to the battery pack 1 of this disclosure. Although this embodiment will be described based on pouch-type secondary batteries with high energy density and easy stacking, it should be understood, as shown in the accompanying drawings, that cylindrical or prismatic secondary batteries can also be applied to the battery cell 100.

[0063] The battery pack housing 200 can be configured to accommodate multiple battery cells 100. The battery pack housing 200 can be configured as a box shape including multiple frames.

[0064] The battery pack casing 200 may be made of or include materials that ensure mechanical rigidity, such as metals (such as steel or SUS) or plastics, to securely protect the battery cells 100 contained therein.

[0065] The cooling plate 300 can be disposed within the battery pack housing 200. The cooling plate 300 can be configured to cool the battery cells 100. The cooling plate 300 can be configured to be filled with a cooling medium.

[0066] The cooling plate 300 can be disposed on one side of the battery cell 100. For example, as Figure 3 As disclosed in the illustrated embodiment, the cooling plate 300 may be disposed on the top of the battery cell 100.

[0067] When thermal runaway occurs in the battery cell 100, the high-temperature emitted substances (such as exhaust gases) tend to flow upwards and can move towards the upper side of the battery pack casing 200. Therefore, according to the configuration implemented above according to this disclosure, since the cooling plate 300 is disposed on the top of the battery cell 100, the exhaust gases or flames can be cooled by the cooling medium within the cooling plate 300. In other words, according to the configuration implemented above according to this disclosure, the heat emitted from the exhaust gases, etc., can be effectively controlled.

[0068] Specifically, the cooling plate 300 may include a cooling channel CP. The cooling channel CP may be configured to be filled with a cooling medium. The cooling channel CP may refer to a channel configured to allow a cooling medium, such as cooling water, to flow through it.

[0069] The cooling channel CP can be formed within the internal space of the cooling plate 300. For example, a hollow space can be formed within the cooling plate 300 to allow the cooling medium to flow through it. Alternatively, the cooling channel CP can be configured as a pipe within the internal space of the cooling plate 300.

[0070] Additionally, the cooling plate 300 may include a spray hole 310. The spray hole 310 may be configured to discharge cooling medium within the cooling plate 300 toward the battery cell 100. The spray hole 310 may be configured to communicate with the cooling channel CP. The spray hole 310 may be configured to communicate with the housing space of the battery cell 100.

[0071] According to the configuration implemented above in this disclosure, when a thermal event such as thermal runaway occurs in the battery assembly 10, the cooling medium in the cooling channel CP can be directly introduced into the housing space of the battery cell 100 through the injection hole 310. That is, the cooling medium of the cooling plate 300 can directly cool the battery cell 100. Therefore, the effective cooling performance of the battery pack 1 can be ensured.

[0072] Specifically, according to the configuration implemented above in this disclosure, the temperature of the battery cell 100 can be rapidly reduced by the cooling medium in the initial stage of a thermal event, thereby delaying or preventing heat transfer between the battery cells 100. Therefore, the safety and reliability of the battery pack 1 can be ensured.

[0073] The cover member 400 can be configured to cover the injection hole 310. The cover member 400 can be configured to prevent the cooling medium inside the cooling plate 300 from being discharged to the outside under normal conditions of the battery pack 1.

[0074] The cover member 400 can be disposed on the inner surface 300a of the cooling plate 300. Multiple cover members 400 can be disposed. The multiple cover members 400 can be respectively disposed for multiple injection holes 310.

[0075] According to the configuration implemented above in this disclosure, even if the injection hole 310 is formed in the cooling plate 300, the cooling medium inside the cooling plate 300 can be prevented from being discharged to the outside under the normal state of the battery pack 1.

[0076] Figure 4 This is a bottom perspective view of a cooling plate included in a battery pack according to an embodiment of the present disclosure.

[0077] Multiple injection holes 310 can be provided. The multiple injection holes 310 can be arranged to be spaced apart from each other in the horizontal direction.

[0078] The injection hole 310 can be formed in the inner surface 300a of the cooling plate 300. Furthermore, as... Figure 5 In the embodiment shown, the plurality of injection holes 310 can be arranged along the extension direction of the cooling channel CP.

[0079] According to the configuration implemented above in this disclosure, the cooling medium in the cooling channel CP can be directly discharged to the outside of the cooling plate 300 through the injection hole 310, and can flow to the battery cell 100. Therefore, the battery cell 100 can be cooled more quickly.

[0080] Alternatively, the location and structure of the injection port 310 can be configured to be independent of the structure and arrangement shape of the cooling channel CP.

[0081] The cover member 400 can be connected to the inner surface 300a of the cooling plate 300. The cover member 400 can be connected to the injection hole 310. The cover member 400 can be configured to be at least partially inserted into the injection hole 310. For example, the cover member 400 can be configured to be interference-fitted into the injection hole 310. That is, the cover member 400 can be inserted into the injection hole 310. In this case, the cross-sectional area of ​​the cover member 400 can be configured to be larger than the cross-sectional area of ​​the injection hole 310. The outer peripheral surface of the cover member 400 can be configured to surround the inner peripheral surface of the injection hole 310.

[0082] According to the configuration implemented above in this disclosure, the cover member 400 can stably cover the injection hole 310. Even if vibration or impact is applied to the battery pack 1, the configuration implemented above in this disclosure can prevent the cover member 400 from easily separating from the injection hole 310. Therefore, leakage of the cooling medium from the injection hole 310 can be minimized, thereby ensuring water tightness.

[0083] Figure 5 This is a cross-sectional view of a battery pack experiencing a thermal event according to an embodiment of this disclosure.

[0084] In addition, such as Figure 5As shown in the embodiment, the cover member 400 can be configured to open the injection port 310 when a thermal event occurs in the battery cell 100. Specifically, when a thermal event occurs in the battery cell 100, the cooling medium within the cooling plate 300 can be configured to flow through the injection port 310 to the battery cell 100 (see reference). Figure 5 (The thick arrow in the middle).

[0085] According to the configuration implemented in this disclosure, the cooling medium can directly cool the battery cell 100, thereby ensuring the effective cooling performance of the battery pack 1.

[0086] Furthermore, in the event of a thermal event such as thermal runaway in the battery pack 1, the cooling medium can flow directly to the battery cells 100, thereby effectively preventing or delaying the propagation of thermal runaway between the battery cells 100. Therefore, the safety and reliability of the battery pack 1 can be guaranteed.

[0087] Furthermore, this disclosure can be configured such that the injection holes 310 provided only for the battery cell 100 where a thermal event occurs are opened. Therefore, under normal conditions, the cover member 400 can remain in a state covering the injection holes 310, thereby preventing the cooling medium from being discharged. However, when a thermal event occurs in some of the battery cells 100, generating exhaust gases or flames, at least some of the cover members 400 can be opened to open some of the injection holes 310.

[0088] Therefore, according to the configuration implemented above in this disclosure, at least some of the cover members 400 can open some of the injection holes 310, allowing the cooling medium to flow toward the battery cell 100. Thus, effective cooling performance of the battery pack 1 can be ensured.

[0089] Figure 6 This is a perspective view of the cover member included in a battery pack according to an embodiment of the present disclosure, and Figure 7 This is a cross-sectional view showing a partial configuration of a battery pack according to an embodiment of the present disclosure.

[0090] Reference Figure 6 and Figure 7 The specific structure of the cover member 400 is described. As a specific example, the cover member 400 may include a connecting portion 410 and a cover portion 420.

[0091] The connecting portion 410 can be configured to connect to the injection hole 310. The connecting portion 410 can be configured to surround the inner circumferential surface of the injection hole 310. The connecting portion 410 can be configured to seal the injection hole 310. The connecting portion 410 can have a substantially cylindrical shape. The cross-sectional area of ​​the connecting portion 410 can be larger than the cross-sectional area of ​​the injection hole 310.

[0092] The connecting portion 410 can be elastic. The connecting portion 410 can be formed of an elastic material. Additionally, the connecting portion 410 can be formed of a material capable of ensuring watertightness. For example, the connecting portion 410 can be made of rubber.

[0093] A through hole TH can be formed in the connecting portion 410. The through hole TH can be configured to communicate with the injection hole 310. The through hole TH can be formed in the central portion of the connecting portion 410. That is, the connecting portion 410 can be configured in a cylindrical shape, and the through hole TH is formed in the central portion. The height of the through hole TH can correspond to the height of the cover member 400. The cross-sectional area of ​​the through hole TH can approximately correspond to the cross-sectional area of ​​the injection hole 310.

[0094] The through-hole TH can be configured to have a substantially cylindrical shape. However, the shape of the through-hole TH is not limited to this, and the through-hole TH can have any shape corresponding to the shape of the injection hole 310.

[0095] The cover portion 420 can be disposed in the through hole TH of the connecting portion 410. The cover portion 420 can be configured to be fixed to the cooling plate 300 via the connecting portion 410. The cover portion 420 can be configured to cover the injection hole 310. That is, the cover portion 420 can be configured to cover the through hole TH.

[0096] The cover portion 420 can be configured to have a small thickness. For example, the cover portion 420 can be configured as a polymer film, such as PP or PE. The cover portion 420 can be configured to have a minimum thickness of 0.05 mm / 0.1 mm / 0.2 mm depending on the material.

[0097] For example, the cover 420 may rupture in the event of thermal runaway. Alternatively, the cover 420 may be configured to melt in the event of thermal runaway. The cover 420 may melt due to the heat from a high-temperature venting substance (such as exhaust gas or a flame). For example, the melting point of the cover 420 may be approximately 100°C to 200°C. Therefore, when a thermal event occurs in the battery cell 100, the cover 420 disposed in the injection hole 310 corresponding to the battery cell 100 may melt, allowing the cooling medium to flow toward the battery cell 100 through the injection hole 310.

[0098] In addition, refer to Figure 6 and Figure 7 The connecting portion 410 may include a first portion 411. The first portion 411 may be configured to be inserted into the injection hole 310. The outermost periphery of the first portion 411 may be configured to substantially correspond to the inner periphery of the injection hole 310. The outermost cross-sectional area of ​​the first portion 411 may be configured to be larger than the cross-sectional area of ​​the through hole TH. The first portion 411 may be configured to have a substantially cylindrical shape.

[0099] Furthermore, the cover member 400 can be configured to prevent separation from the injection hole 310 toward the battery cell 100. Specifically, the connecting portion 410 may include a second portion 412. The second portion 412 can be configured to extend in one direction from the first portion 411. For example, the second portion 412 can be configured to extend from the first portion 411 toward the outside of the battery pack 1. Therefore, when the cover member 400 is connected to the injection hole 310, the second portion 412 can be positioned within the cooling plate 300.

[0100] The second part 412 can be configured to be mounted on the inner surface 300a of the cooling plate 300. That is, the inner surface of the second part 412 can be configured to be held in place by the inner surface 300a of the cooling plate 300. The outer cross-sectional area of ​​the second part 412 can be configured to be larger than the cross-sectional area of ​​the injection hole 310. The cross-sectional area of ​​the second part 412 can be configured to be larger than the cross-sectional area of ​​the first part 411.

[0101] The cover member 400 may separate from the injection hole 310 due to gravity, impact, heat, etc. Without the second part 412, the cover member 400 may separate from the injection hole 310 due to gravity, impact, heat, etc., causing the injection hole 310 to be open even under normal conditions. However, according to the configuration implemented above in this disclosure, the cover member 400 keeps the injection hole 310 closed under normal conditions until thermal runaway occurs in the battery cell 100, thereby ensuring the fixing force between the cover member 400 and the injection hole 310.

[0102] The second portion 412 can be configured to contact the cooling medium within the cooling channel CP. In this case, since the thickness of the second portion 412 may prevent the cooling medium from flowing smoothly into the through-hole TH, the outer surface of the second portion 412 can be configured to minimize the flow resistance of the cooling medium. For example, as... Figure 7 As shown in part A, the outer surface of the second part 412 can be configured to slope inward. That is, the outer surface of the second part 412 can have a sloped surface. This sloped surface can be configured, for example, to slope gently at approximately 180 degrees.

[0103] According to the configuration implemented above in this disclosure, flow resistance can be minimized when the cooling medium flows along the outer surface of the second portion 412. Therefore, when the cover 420 is opened, the cooling medium can flow smoothly into the through hole TH.

[0104] Additionally, refer to Figure 6 and Figure 7The connecting portion 410 may include a third portion 413. The third portion 413 may be configured to extend from the first portion 411. The third portion 413 may be configured to extend from the first portion 411 to the other side. For example, the third portion 413 may be configured to extend from the first portion 411 into the battery pack 1. Therefore, when the cover member 400 is connected to the injection hole 310, the third portion 413 may be positioned on the outer side of the cooling plate 300. The third portion 413 may be disposed on the outer side of the inner surface 300a of the cooling plate 300.

[0105] The third portion 413 can be configured to prevent the cover member 400 from separating into the cooling plate 300. The third portion 413 can be configured to support the outer side of the inner surface 300a of the cooling plate 300. That is, the inner surface of the third portion 413 can be configured to be held in place by the inner surface 300a of the cooling plate 300. The cross-sectional area of ​​the third portion 413 can be configured to be larger than the cross-sectional area of ​​the injection hole 310. The cross-sectional area of ​​the third portion 413 can be configured to be larger than the cross-sectional area of ​​the first portion 411.

[0106] According to the configuration implemented above in this disclosure, the cover member 400 can be prevented from separating outward from the injection hole 310 due to impact or heat, thereby stably maintaining the cover member 400 in a closed state of the injection hole 310 under normal conditions before thermal runaway occurs in the battery cell 100. Therefore, the fixing strength between the cover member 400 and the injection hole 310 can be ensured.

[0107] As described above, the cover member 400 can be interference-fitted into the injection hole 310. For example, the cover member 400 can be fitted into the injection hole 310 from the outside of the cooling plate 300 in a direction from the outside to the inside of the battery pack 1. That is, when the third part 413 slides into the injection hole 310, the first part 411 can be inserted into the injection hole 310.

[0108] In this case, such as Figure 7 In the illustrated embodiment, the third portion 413 may include a guide portion 413a. The guide portion 413a may be disposed on the outer surface of the third portion 413. The guide portion 413a may be configured to guide the cover member 400 into the injection hole 310. The guide portion 413a may be configured to be inclined outwards towards the cover member 400.

[0109] According to the configuration implemented above in this disclosure, when the cover member 400 is connected to the injection hole 310, the guide portion 413a of the third portion 413 allows the cover member 400 to be inserted into the injection hole 310 more smoothly. Therefore, the assemblability between the cover member 400 and the injection hole 310 can be enhanced.

[0110] Figure 8This is a diagram illustrating the process of manufacturing a cover member included in a battery pack according to an embodiment of the present disclosure.

[0111] The cover 420 can be configured to be inserted into and fixed to the connecting part 410. The cover 420 can be configured to be inserted into and fixed to the first part 411.

[0112] For example, as in Figure 8 As disclosed in the illustrated embodiment, the cover portion 420 can be formed by insert injection molding. For this purpose, the connecting portion 410 can be formed of a material suitable for insert injection molding (e.g., rubber).

[0113] Specifically, after fixing the position of the cover portion 420 using the clamp B, rubber or the like can be injected into the upper and lower parts of the cover portion 420 using the injection molding device C, thereby forming the connecting portion 410. The connecting portion 410 can be injected to surround the cover portion 420. Therefore, when the connecting portion 410 hardens, the cover portion 420 can be inserted (insert injection molded) into the connecting portion 410.

[0114] In this configuration, clamp B can be configured to correspond to the shape of the through hole TH. Since rubber or similar materials cannot be injected into the portion where clamp B is located, the through hole TH can be formed.

[0115] According to the embodiments described above, the cover portion 420 and the connecting portion 410, made of different materials, can be manufactured as a single piece. Furthermore, since the process of assembling the cover portion 420 and the connecting portion 410 is eliminated, the process can be shortened, and productivity can be increased. Additionally, the heat resistance and impact resistance of the cover member 400 can be improved, thereby ensuring structural stability when inserted into the injection hole 310. Furthermore, the weight of the cover member 400 can be minimized.

[0116] Figure 9 This is a cross-sectional view showing a partial configuration of a battery pack according to another embodiment of the present disclosure.

[0117] Reference Figure 9 The through-hole TH can be configured in a frustoconical shape. For example, the through-hole TH can be configured in a frustoconical shape with a cross-sectional area that gradually narrows toward the cooling plate 300. In this case, the fixture B used to manufacture the cover member 400 can be configured in a frustoconical shape corresponding to the shape of the through-hole TH.

[0118] According to the configuration implemented above in this disclosure, when the through hole TH of the connecting portion 410 is configured in a frustoconical shape, the flow resistance of the cooling medium caused by the step of the second portion 412 can be reduced. Therefore, when the cover portion 420 is opened, the cooling medium can flow smoothly into the through hole TH, thereby cooling the battery cell 100 more quickly.

[0119] Figure 10 This is a cross-sectional view showing a partial configuration of a battery pack according to another embodiment of the present disclosure.

[0120] When the cover member 400 is connected to the injection hole 310, a gap may be formed between the cover member 400 and the injection hole 310. In this case, in order to improve the sealing strength of the cover member 400, the battery pack 1 according to the embodiment of the present disclosure may further include a sealing member 500, such as... Figure 10 As shown. The sealing member 500 can be inserted between the inner surface of the cover member 400 and the injection hole 310. Alternatively, the sealing member 500 can be inserted between the cover member 400 and the cooling plate 300. That is, the sealing member 500 can be provided at the joint between the connecting portion 410 and the injection hole 310.

[0121] The sealing member 500 can be made of a material capable of ensuring watertightness. Furthermore, the sealing member 500 can be formed of a heat-resistant and / or fire-resistant material. Therefore, even if a thermal event occurs in the battery cell 100, the sealing member 500 can be prevented from melting due to heat, thereby preventing the cover member 400 from separating from the injection hole 310. For example, the sealing member 500 can be configured as a silicone sealant.

[0122] According to the configuration implemented above in this disclosure, the sealing member 500 can be applied to the joint between the connecting portion 410 and the injection hole 310, thereby improving the seal between the cover member 400 and the injection hole 310. Therefore, leakage of the cooling medium from the injection hole 310 can be minimized.

[0123] Figure 11 This is a perspective view of a battery module included in a battery pack according to an embodiment of the present disclosure.

[0124] Reference Figure 11 Multiple battery cells 100 can be grouped into one or more battery modules 10. That is, the battery pack 1 according to this disclosure may include multiple battery modules 10, and the multiple battery cells 100 included in the battery pack 1 may be divided and included in multiple battery modules 10. In this case, the multiple battery cells 100 included in the battery module 10 may be electrically connected to each other.

[0125] The battery assembly 10 may include a housing 11. The housing 11 may be configured to have an internal space to accommodate the battery cells 100. That is, the housing 11 may serve as a boundary for assembling multiple battery cells 100 into multiple battery assemblies 10 and physically defining the internal space of each battery assembly 10.

[0126] The housing 11 may be made of a rigid and heat-resistant metallic material to physically or chemically protect the housed battery cell 100.

[0127] In addition, the battery assembly 10 may include a busbar assembly and / or module terminals electrically connected to a plurality of battery cells 100.

[0128] The housing 11 of the battery assembly 10 can be configured to contact the cooling plate 300. Therefore, the heat of the battery assembly 10 can be transferred through the cooling medium within the cooling plate 300, thereby ensuring the cooling performance of the battery assembly 10.

[0129] The housing 11 may have cooling holes CH. The cooling holes CH may be formed on one side of the housing 11. For example, as... Figure 11 In the embodiment shown, cooling holes CH can be formed in the upper surface of the housing 11.

[0130] The cooling hole CH can be configured to communicate with the injection hole 310 of the cooling plate 300. The cooling hole CH can be configured to allow the cooling medium within the cooling plate 300 to flow into the housing 11. That is, when a thermal event occurs in the battery assembly 10, the cooling medium within the cooling channel CP can flow into the housing 11 through the injection hole 310 and the cooling hole CH.

[0131] According to the configuration implemented above in this disclosure, the cooling medium can flow into the housing 11 to directly contact the battery cells 100 within the housing 11, thereby effectively preventing or delaying the propagation of thermal runaway between the battery cells 100. Furthermore, the cooling performance of the battery assembly 10 can be improved.

[0132] Figure 12 This is a top view of the internal configuration of a battery pack according to an embodiment of the present disclosure.

[0133] Cooling holes CH can be formed at positions corresponding to the injection holes 310. The cooling holes CH can be configured to face the injection holes 310. Therefore, the cooling holes CH can be configured to directly communicate with the injection holes 310. Furthermore, the number of cooling holes CH can be set to correspond to the number of injection holes 310. Additionally, the size of the cooling holes CH can be configured to be substantially the same as the size of the injection holes 310. Furthermore, as... Figure 12 As shown, the cooling hole CH can also be set along the extension direction of the cooling channel CP.

[0134] According to the configuration implemented above in this disclosure, the cooling medium discharged from the cooling plate 300 through the injection hole 310 can be directly introduced into the housing 11 through the cooling hole CH. Therefore, the battery assembly 10 can be cooled more quickly.

[0135] Figure 13 This is a bottom perspective view of a battery module included in a battery pack according to an embodiment of the present disclosure.

[0136] The housing 11 may include a vent VH. The vent VH can be formed by perforation on one side of the housing 11. For example, as... Figure 13 In the embodiment shown, the vent hole VH can be formed in the lower surface of the housing 11.

[0137] The vent VH can be configured to discharge exhaust gases generated from the battery cell 100 to the outside of the housing 11. Therefore, the battery assembly 10 can be made to vent in a specific direction via the vent VH.

[0138] Multiple exhaust ports VH can be set. The multiple exhaust ports VH can be arranged at regular intervals along the horizontal direction.

[0139] According to the above-implemented configuration of this disclosure, in the event of an abnormal condition in the battery cell 100, the high-temperature gas or flame generated in the battery cell 100 can be quickly discharged to the outside of the battery assembly 10, thereby effectively preventing or delaying the propagation of thermal runaway between the battery cells 100.

[0140] The exhaust port VH and the cooling port CH can be provided on different surfaces of the housing 11. For example, the cooling port CH can be provided in the upper surface of the housing 11, facing the cooling plate 300. Alternatively, the exhaust port VH can be provided in the lower surface of the housing 11.

[0141] According to the configuration implemented above in this disclosure, the venting path and cooling path of the battery pack 10 can be separated from each other. Therefore, the venting performance and cooling performance of the battery pack 1 can be improved.

[0142] Figure 14 This is a cross-sectional view of a battery pack experiencing a thermal event according to an embodiment of this disclosure.

[0143] Reference Figure 1 , Figure 2 and Figure 14 The battery pack housing 200 may include a bottom frame 210 and multiple side frames 220.

[0144] The bottom frame 210 can be configured to house multiple battery modules 10 thereon. The bottom frame 210 can form the lower surface of the battery pack housing 200 and can be configured as a square plate shape. In addition, the bottom frame 210 can have a flat upper surface to allow the battery modules 10 to be stably mounted thereon.

[0145] Multiple side frames 220 may be configured to extend upward from corresponding edges of the bottom frame 210. The multiple side frames 220 may be configured to surround the battery assembly 10. More specifically, the multiple side frames 220 may each include a right wall at the +X direction end, a rear wall at the +Y direction end, a left wall at the -X direction end, and a front wall at the -Y direction end of the bottom frame 210, thereby forming the side surface of the battery pack housing 200.

[0146] In addition, the battery pack housing 200 may include a crossbeam 230. The crossbeam 230 may be configured to divide the internal space of the battery pack housing 200. The crossbeam 230 may be configured to separate the plurality of battery modules 10. The crossbeam 230 may be configured to extend along the left-right direction and / or front-back direction of the battery pack housing 200.

[0147] Multiple crossbeams 230 can be provided. The crossbeams 230 can be configured to connect opposing side frames 220 among multiple side frames 220. For example, ... Figure 2 As shown, multiple battery modules 10 can be arranged separately in four rows and two columns via crossbeams 230.

[0148] In addition, the battery pack housing 200 may also include a cover frame 240. The cover frame 240 may be configured to cover the top of the battery assembly 10. The cover frame 240 may be configured to form the upper surface of the battery pack housing 200. The cover frame 240 may be coupled to the side frame 220. Alternatively, the cover frame 240 may be configured to be integral with the side frame 220.

[0149] The following will refer to Figure 14 The structure for discharging high-temperature exhaust substances (e.g., exhaust gases) to the outside of the battery pack casing 200 is described in detail.

[0150] An exhaust passage VP may be formed in the battery pack housing 200. The exhaust passage VP can refer to a channel through which exhaust gases, etc., flow. The exhaust passage VP may be configured to allow exhaust gases generated in the battery cell 100 to flow in and move. For example, the exhaust passage VP may be configured to allow exhaust gases discharged from the exhaust port VH to flow. The exhaust passage VP may be disposed within the battery pack housing 200.

[0151] The exhaust passage VP may include a first exhaust passage VP1. The first exhaust passage VP1 may be configured to allow exhaust gases exiting from the exhaust port VH to flow in. For example, as in... Figure 14 As disclosed in the embodiment shown, the bottom frame 210 may have a hollow space therein, and the first exhaust passage VP1 may be defined as a hollow space formed in the bottom frame 210.

[0152] According to the configuration implemented above in this disclosure, exhaust gas or flame generated from the battery cell 100 can flow into the exhaust passage VP formed in the battery pack housing 200 (see...). Figure 14 (The dashed arrow in the diagram). Therefore, when a thermal event occurs in the battery cell 100 and thereby generates high-temperature gas or flame, the battery pack 1 according to this disclosure can discharge exhaust gas in a specific direction rather than in all directions.

[0153] Therefore, high-temperature gas or flame can be quickly discharged to the outside of the battery pack 1 through the first exhaust channel VP1, thereby minimizing the heat propagation to other battery cells 100.

[0154] Typically, when gas is emitted from the battery cell 100, electrode plate fragments or active material fragments inside the battery cell 100 can be expelled to the outside under a heated state. These high-temperature particles can appear in the form of sparks. According to this disclosure, even if high-temperature particles are emitted from the battery cell 100, the battery pack 1 can prevent the high-temperature particles from easily escaping to the outside of the battery pack 1, and reduce the temperature of the high-temperature particles as they move through the first exhaust channel VP1 before escaping, thereby preventing the high-temperature particles from acting as an ignition source outside the battery pack 1.

[0155] Figure 15 This is an enlarged cross-sectional view of a battery pack according to an embodiment of the present disclosure, and Figure 16 This is an internal perspective view of the battery pack housing included in a battery pack according to another embodiment of the present disclosure.

[0156] Reference Figure 15 and Figure 16 The vent 211 can be formed in the inner surface of the battery pack housing 200. The vent 211 can be configured to discharge exhaust gas from the battery cell 100 into the first exhaust passage VP1. That is, the vent 211 can be configured to connect the first exhaust passage VP1 to the receiving space of the battery cell 100. For example, the vent 211 can be formed in the inner surface of the bottom frame 210.

[0157] The discharge port 211 can be formed at a position corresponding to the exhaust port VH. Therefore, the discharge port 211 can be configured to directly communicate with the exhaust port VH. Furthermore, the number of discharge ports 211 can be set to correspond to the number of exhaust ports VH. Additionally, the size of the discharge port 211 can be substantially the same as the size of the exhaust port VH.

[0158] According to the configuration implemented above in this disclosure, exhaust gas or flame generated from the battery cell 100 inside the housing 11 can be directly introduced into the first exhaust channel VP1 located at the bottom through the exhaust port VH and the discharge port 211. Therefore, exhaust gas generated from the battery assembly 10 can be quickly discharged to the outside of the battery pack 1, thereby ensuring the safe exhaust performance of the battery pack 1.

[0159] Return to reference Figure 14 A second exhaust passage VP2 can be formed within the battery pack housing 200. The second exhaust passage VP2 can be configured as a hollow space within the battery pack housing 200. That is, the second exhaust passage VP2 can be defined as a hollow space formed within one of the frames of the battery pack housing 200. The second exhaust passage VP2 can be configured to connect to the first exhaust passage VP1. Furthermore, the second exhaust passage VP2 can be configured to communicate with the outside of the battery pack housing 200.

[0160] Therefore, the exhaust gas generated from the battery cell 100 can flow into the first exhaust passage VP1 connected to the relevant battery cell 100, and then move to the second exhaust passage VP2 connected to the first exhaust passage VP1.

[0161] According to the configuration implemented above in this disclosure, when a thermal event occurs in the battery cell 100 or battery assembly 10, the flow of fluid (e.g., exhaust gas) toward adjacent battery cells 100 and / or battery assembly 10 can be minimized. Therefore, the propagation of thermal runaway between battery cells 100 and / or battery assembly 10 can be effectively prevented or delayed. Thus, the safety and reliability of the battery pack 1 can be guaranteed.

[0162] For example, such as Figure 14 In the embodiment shown, the second exhaust passage VP2 can be formed within the side frame 220. The second exhaust passage VP2 can be formed within all four walls of the side frame 220.

[0163] Therefore, the exhaust gas generated from the battery cell 100 can move to the first exhaust channel VP1 formed in the bottom frame 210, and then to the second exhaust channel VP2 formed in the side frame 220. The exhaust gas can be discharged to the outside of the battery pack casing 200.

[0164] To connect the first exhaust passage VP1 and the second exhaust passage VP2, a connection hole may be formed in the battery pack housing 200. The connection hole may be configured to communicate between the first exhaust passage VP1 and the second exhaust passage VP2.

[0165] Furthermore, a third exhaust passage VP3 can be formed within the battery pack housing 200. The third exhaust passage VP3 can be configured as a hollow space within the battery pack housing 200. That is, the third exhaust passage VP3 can be defined as a hollow space formed within one of the frames of the battery pack housing 200. The third exhaust passage VP3 can be configured to communicate with the first exhaust passage VP1 and the second exhaust passage VP2.

[0166] As a more specific example, such as Figure 14 In the embodiment shown, the third exhaust passage VP3 can be formed in the crossbeam 230. Therefore, exhaust gases generated from the battery cell 100 can move to the first exhaust passage VP1 formed in the bottom frame 210, and then to the second exhaust passage VP2 formed in the side frame 220, and the third exhaust passage VP3 formed in the crossbeam 230.

[0167] According to the above embodiments of this disclosure, exhaust gases and the like discharged from the battery cell 100 or battery assembly 10 in contact with the crossbeam 230 can be directly moved to the third exhaust channel VP3 formed in the crossbeam 230, so that the exhaust gases and the like can be discharged to the outside of the battery pack casing 200 more quickly.

[0168] In addition, refer to Figure 2 and Figure 14 The battery pack housing 200 may include an exhaust device 250.

[0169] The venting device 250 can be configured to discharge gases generated from the battery cell 100 to the outside of the battery pack casing 200. The venting device 250 can be configured to open by the pressure of the exhaust gases generated inside the battery pack casing 200 and discharge the exhaust gases to the outside of the battery pack casing 200.

[0170] The venting device 250 can be configured to open and close according to the internal pressure of the battery pack housing 200. Alternatively, the venting device 250 can be configured in the form of an orifice. Furthermore, this disclosure is not limited to a particular type or form of the venting device 250, and various venting devices 250 known at the time of filing of this disclosure can be applied to the battery pack 1 of this disclosure.

[0171] Specifically, the venting device 250 can be mounted on the side of the battery pack housing 200, that is, on the side frame 220. Multiple venting devices 250 can be provided. The venting device 250 can be provided on at least one of the multiple side frames 220. The venting device 250 can be formed individually on two or more side frames 220, or two or more venting devices 250 can be formed on a single side frame 220.

[0172] based on Figure 2The number and location of the exhaust devices 250 described in the embodiments are merely examples and can be changed to various other numbers or locations.

[0173] These exhaust devices 250 can be configured to communicate with the second exhaust passage VP2. Therefore, the exhaust gas from the second exhaust passage VP2 can be configured to be discharged to the outside of the battery pack casing 200 through the exhaust devices 250.

[0174] According to the configuration implemented above in this disclosure, exhaust gases or similar substances can flow directly to the second exhaust passage VP2 of the side frame 220 having an exhaust device 250, allowing the exhaust gases or similar substances to be quickly discharged to the outside of the battery pack casing 200. Therefore, the safe exhaust performance of the battery pack 1 can be ensured.

[0175] The following describes in detail the exhaust direction of the exhaust gas when high-temperature exhaust gas or flame is generated in the battery cell 100. The exhaust gas can flow through the exhaust port 211 into the first exhaust channel VP1 located at the bottom of the battery cell 100, and the exhaust gas flowing through the first exhaust channel VP1 can flow into the second exhaust channel VP2 and / or the third exhaust channel VP3. The exhaust gas flowing through the third exhaust channel VP3 can move to the second exhaust channel VP2. This exhaust gas can be discharged to the outside of the battery pack casing 200 through the exhaust device 250 communicating with the second exhaust channel VP2.

[0176] When the cooling medium is introduced into the housing 11 through the injection hole 310 and the cooling hole CH, the cooling medium accumulated in the housing 11 may cause a short circuit in the battery cell 100.

[0177] To address this problem, the battery pack 1 according to an embodiment of the present disclosure can be configured to discharge the cooling medium introduced into the housing 11 to the outside of the housing 11.

[0178] For example, such as Figure 14 and Figure 15 In the embodiments disclosed herein, the vent VH can be configured to discharge the cooling medium introduced through the cooling vent CH to the outside of the housing 11.

[0179] According to the configuration implemented above in this disclosure, by properly discharging the cooling medium to the outside of the housing 11 via the vent hole VH, short circuits in the battery cell 100 can be prevented or suppressed.

[0180] In this configuration, the exhaust port VH can be positioned on the surface of the housing 11 facing the cooling hole CH. For example, the cooling hole CH can be located in the upper surface of the housing 11, and the exhaust port VH can be located in the lower surface of the housing 11.

[0181] According to the configuration implemented above in this disclosure, the cooling medium flowing from the cooling hole CH can naturally flow towards the vent hole VH by gravity. Therefore, since the cooling medium inside the housing 11 can be completely discharged to the outside of the housing 11 through the vent hole VH, short circuits in the battery cell 100 can be prevented or suppressed more effectively.

[0182] Additionally, the cooling medium discharged through the exhaust port VH can be configured to flow into the first exhaust passage VP1 through the exhaust port 211 (see...). Figure 15 (The thick arrow in the middle).

[0183] According to the configuration implemented above in this disclosure, when the cooling medium flows through the first exhaust channel VP1, it is possible to prevent the cooling medium discharged to the outside of the housing 11 through the exhaust port VH from affecting other battery components 10, etc. Therefore, short circuits in normal battery components 10 can be prevented.

[0184] Figure 17 This is a schematic perspective view of a vehicle including a battery pack according to an embodiment of the present disclosure.

[0185] Reference Figure 17 The vehicle V according to embodiments of the present disclosure may include one or more battery packs 1 according to embodiments of the present disclosure. The vehicle V according to the present disclosure may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle V may include four-wheeled vehicles and two-wheeled vehicles. The vehicle V may be powered and operable by the battery packs 1 according to embodiments of the present disclosure.

[0186] As described above, although this disclosure has been described with reference to limited embodiments and accompanying drawings, this disclosure is not limited thereto, and various modifications and changes can be made by those skilled in the art without departing from the technical spirit of this disclosure and the equivalent scope of the described claims.

Claims

1. A battery pack, the battery pack comprising: Multiple battery cells; A battery pack housing configured to house the plurality of battery cells; A cooling plate is disposed inside the battery pack housing and has cooling channels and injection holes. The cooling channels are filled with a cooling medium, and the injection holes are configured to discharge the cooling medium from the cooling channels toward the battery cells. as well as A cover member configured to cover the injection hole.

2. The battery pack according to claim 1, in, The cover member is configured to be at least partially inserted into the injection hole.

3. The battery pack according to claim 1, in, The cover member is configured to open the injection hole when a thermal event occurs in the battery cell.

4. The battery pack according to claim 1, in, The cover component includes: A connecting portion, the connecting portion being configured to surround the inner surface of the injection hole, and having a through hole formed in the center of the connecting portion; and A cover portion, which is configured to cover the through hole.

5. The battery pack according to claim 4, in, The connecting part includes: A first part, configured to be inserted into the injection hole; and The second part extends from the first part toward one side so as to be placed on the inner surface of the cooling plate.

6. The battery pack according to claim 5, in, The outer surface of the second part is configured to slope inward.

7. The battery pack according to claim 5, in, The connecting part includes: The third part extends from the first part toward the other side so as to be disposed on the outer side of the inner surface of the cooling plate.

8. The battery pack according to claim 7, in, The outer surface of the third portion includes a guide portion configured to guide insertion into the injection hole.

9. The battery pack according to claim 4, in, The cover is formed in the connecting part by insert injection molding.

10. The battery pack according to claim 4, in, The through hole is configured in a truncated cone shape.

11. The battery pack according to claim 1, further comprising: A sealing member is inserted between the cover member and the inner surface of the injection hole.

12. The battery pack according to claim 1, further comprising: The housing is configured to house the plurality of battery cells and has cooling holes formed on one side to communicate with the injection holes.

13. The battery pack according to claim 12, in, The housing has: A vent, configured to discharge exhaust gases generated by the battery cell to the outside.

14. A vehicle comprising a battery pack according to any one of claims 1 to 13.

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