Battery pack and vehicle including same

Abstract

A battery pack according to an embodiment of the present invention includes: a battery module including a plurality of battery cells provided in a vertically stacked state and a module housing having an open lower portion and an upper portion configured to be detachable; and a pack housing for accommodating the battery module.

Description

Battery pack and automobile including the same

[0001] The present invention relates to a battery pack and an automobile including the same.

[0002] This application is a priority application for Korean Patent Application No. 10-2025-0040567 filed on March 28, 2025 and Korean Patent Application No. 10-2025-0128324 filed on September 9, 2025, and all contents disclosed in the specification and drawings of said applications are incorporated into this application by reference.

[0003] Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. These secondary batteries are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, as they possess not only the primary advantage of drastically reducing the use of fossil fuels but also the advantage of generating no by-products from energy use.

[0004] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Additionally, depending on the charge / discharge capacity required for the battery pack, multiple battery cells are connected in parallel to form a battery pack. Accordingly, the number of battery cells included in the battery pack can be varied depending on the required output voltage and / or charge / discharge capacity.

[0005] Meanwhile, in conventional battery packs containing pouch cells, there was a problem where adjacent battery cells would ignite due to conduction, convection, and radiation heat when a pouch cell ignited. Specifically, in conventional battery packs, thermal barriers are used to control conduction heat, but this alone often fails to reach a level where adjacent cells do not ignite due to the conduction heat generated from the ignited cell. Alternatively, even if it is possible to reach a non-ignition level, there was a problem in that it was difficult to apply the thickness and material of the thermal barrier at a realistic mass production level.

[0006] The present invention aims to block conductive heat generated from a battery cell that has ignited when a thermal event occurs in a battery cell included in a battery pack.

[0007] In addition, the present invention aims to block thermal propagation within a battery pack through convective and radiative heat protection when a thermal event occurs in a battery cell included in the battery pack.

[0008] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0009] A battery pack according to one embodiment of the present invention for solving the above-described problem comprises: a battery module comprising a plurality of battery cells stacked in an up-and-down direction and a module housing having an open bottom and a detachable top; and a pack housing that accommodates the battery module.

[0010] In one aspect of the present invention, the battery cell may include an electrode assembly; a receiving portion for receiving the electrode assembly; a sealing portion formed around the periphery of the receiving portion; and a pair of electrode leads connected to the electrode assembly and extended to the outside of the sealing portion.

[0011] Preferably, the receiving portion of the battery cell can be stacked in the vertical direction facing the receiving portion of an adjacent battery cell.

[0012] In another aspect of the present invention, the module housing may include: a support plate coupled in contact with the lower cover of the pack housing; a side plate extending upward from one end of the support plate; an extension plate having a shape that is bent and extended vertically from the upper end of the side plate; and a top plate configured to be coupled with the extension plate and configured to cover the upper part of a stack of a plurality of battery cells.

[0013] Preferably, the extension plate may extend in the opposite direction to the support plate.

[0014] In another aspect of the present invention, the top plate may be provided in a detachable state from the extension plate.

[0015] In one aspect of the present invention, the top plate may be joined in contact with the extension plate.

[0016] In another aspect of the present invention, the top plate may be configured such that at least some portions are bendable.

[0017] In another aspect of the present invention, the battery cell comprises an electrode assembly; a receiving portion for receiving the electrode assembly; a sealing portion formed around the periphery of the receiving portion; and a pair of electrode leads connected to the electrode assembly and extended to the outside of the sealing portion, and at least one venting slit extending in a direction parallel to the extension direction of the sealing portion may be provided on the side plate.

[0018] In one aspect of the present invention, at least one venting slit may be provided on the top plate.

[0019] In another aspect of the present invention, a spaced-apart space may be provided between the side plate of one battery module and the side plate of an adjacent battery module to form a venting path.

[0020] In another aspect of the present invention, a predetermined gap space may be formed between the battery module and the upper cover of the battery pack to form a venting path.

[0021] In one aspect of the present invention, a support plate of any one battery module may be provided in a state of overlapping with a support plate of an adjacent battery module.

[0022] In another aspect of the present invention, the battery module may include a buffer pad on at least one of the space between the battery cells; the upper part of the stack of battery cells; and the lower part of the stack of battery cells.

[0023] In addition, the present invention provides a vehicle comprising at least one battery pack according to the above-described embodiment.

[0024] According to the present invention, when a thermal event occurs in a battery cell included in a battery pack, conductive heat generated from the ignited battery cell can be effectively blocked.

[0025] In addition, according to the present invention, when a thermal event occurs in a battery cell included in a battery pack, thermal propagation within the battery pack can be blocked through convection and radiative heat protection.

[0026] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0027] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0028] FIG. 1 is a perspective view of a battery pack according to one embodiment of the present invention.

[0029] Figure 2 is a simplified perspective view of the interior of the battery pack of Figure 1.

[0030] FIG. 3 is a perspective view of a battery module included inside the battery pack of FIG. 1.

[0031] FIG. 4 is a perspective view of a battery cell included inside the battery module of FIG. 3.

[0032] FIG. 5 is a cross-sectional view of a battery pack according to one embodiment of the present invention.

[0033] Figure 6 is an enlarged view of a battery module included in the battery pack of Figure 5.

[0034] FIG. 7 is a drawing for illustrating a battery module according to another embodiment of the present invention.

[0035] FIG. 8 is a drawing for illustrating a battery module according to another embodiment of the present invention.

[0036] FIG. 9 is a drawing for illustrating a battery module according to another embodiment of the present invention.

[0037] FIG. 10 is a drawing for illustrating a battery module according to another embodiment of the present invention.

[0038] FIG. 11 is a cross-sectional view of a battery pack according to another embodiment of the present invention.

[0039] FIG. 12 is a cross-sectional view of a battery pack according to another embodiment of the present invention.

[0040] FIG. 13 is a cross-sectional view of a battery pack according to another embodiment of the present invention.

[0041] FIG. 14 is a cross-sectional view of a battery pack according to another embodiment of the present invention.

[0042] FIG. 15 is a drawing for explaining a vehicle including the battery pack of FIG. 1.

[0043] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0044] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0045] The statement that two subjects of comparison are identical means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0046] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0047] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0048] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0049] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0050] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0051]

[0052] FIG. 1 is a perspective view of a battery pack (1) according to one embodiment of the present invention, and FIG. 2 is a simplified perspective view of the interior of the battery pack (1) of FIG. 1.

[0053] Referring to FIGS. 1 and 2, a battery pack (1) according to one embodiment of the present invention comprises a battery module (10) comprising a plurality of battery cells (100) and a pack housing (20) that accommodates the battery module (10). In addition to this, the battery pack (1) may further include a thermal conductive layer (30) and / or a module busbar and / or a pack venting portion.

[0054] The battery pack (1) may include a plurality of battery modules (10) inside. Referring to FIG. 2, the plurality of battery modules (10) may be arranged in a horizontally spaced manner. For example, the battery modules (10) may be provided in a form that is extended in one direction, and the plurality of battery modules (10) may be arranged in a direction perpendicular to the extension direction. The plurality of battery modules (10) may be electrically connected to each other by a module busbar (not shown).

[0055] In one aspect of the present invention, the pack housing (20) may include a lower cover (21), a side cover (22), and an upper cover (23). The lower cover (21) may be configured as a plate-shaped structure extending approximately horizontally. The side cover (22) may extend upward from the corner of the lower cover (21). The side cover (22) may be configured to surround the sides of a plurality of battery modules (10). The side cover (22) may be provided in a state where plate-shaped structures extending approximately vertically are joined together. The upper cover (23) may be configured as a plate-shaped structure extending approximately horizontally.

[0056]

[0057] FIG. 3 is a perspective view of a battery module (10) included inside the battery pack (1) of FIG. 1.

[0058] Referring to FIG. 3, the battery module (10) includes a plurality of battery cells (100) and a module housing (200) that accommodates the battery cells (100) inside. In addition to this, the battery module (10) may further include an end plate (not shown). The end plate may be provided on a surface facing the electrode lead (170) of the battery cell (100).

[0059]

[0060] FIG. 4 is a perspective view of a battery cell (100) included inside the battery module (10) of FIG. 3.

[0061] Referring to FIG. 4, the battery cell (100) may be a secondary battery, for example, a pouch-type battery cell (100). However, this does not limit the type of the battery cell (100), and other types of battery cells (100), such as cylindrical cells or prismatic cells, may also be used in the battery module (10) of the present invention.

[0062] Hereinafter, as illustrated in FIG. 4, the battery cell (100) is described as a pouch-type cell. Referring to FIG. 4, the battery cell (100) may include an electrode assembly (110), a receiving portion (130) that accommodates the electrode assembly (110), a sealing portion (150) formed around the receiving portion (130), and a pair of electrode leads (170) that are connected to the electrode assembly (110) and extend outward from the sealing portion (150).

[0063] The above pair of electrode leads (170) are coupled to an electrode tab (not shown) provided in the electrode assembly (110) and can be drawn out to the outside of the sealing portion (150) through the sealing portion (150). The above pair of electrode leads (170) may have a shape that extends along the longitudinal direction of the battery cell (100). The above pair of electrode leads (170) may be drawn out in the same direction or opposite directions to each other.

[0064] Referring to FIG. 4, the battery cell (100) may be configured to vent gas through at least a portion of the sealing portion (150). The sealing portion (150) may be provided with a venting area formed to prevent an increase in internal pressure caused by gas generated inside the battery cell (100). The venting area is formed in at least a portion of the sealing portion (150) and corresponds to an area that is structurally weaker than the surrounding area so that it can be easily broken when internal pressure is applied. The venting area may be, for example, an area where the sealing is formed more weakly than the surrounding area.

[0065] According to this structure, gas generated inside the battery cell (100) can be discharged to the outside of the battery cell (100) through a venting area formed at one end of the battery cell (100). Accordingly, the gas can be discharged to the outside of the battery module (10) through a module case located on the upper side of the battery cell (100). That is, according to this structure, high-temperature gas and flames inside the module can be smoothly discharged.

[0066]

[0067] FIG. 5 is a cross-sectional view of a battery pack (1) according to one embodiment of the present invention, and FIG. 6 is an enlarged view of a battery module (10) included in the battery pack of FIG. 5.

[0068] Referring to FIGS. 3, 5, and 6, the battery module (10) includes a plurality of battery cells (100). The plurality of battery cells (100) may be provided in a stacked state in the vertical direction. Specifically, the receiving portion (130) of the battery cell (100) may be stacked in the vertical direction in a state facing the receiving portion (130) of an adjacent battery cell (100). Here, the vertical direction may also be referred to as the vertical direction or the Z-axis direction. The battery cell (100) may be provided such that the receiving portion (130) faces the vertical direction. That is, the battery cell (100) may be provided in a stacked state in the vertical direction. The electrode lead (170) of the battery cell (100) may be extended in the front-rear direction. That is, the battery cell (100) may be arranged such that the sealing portion (150) faces the side of the battery module (10). The sealing portion (150) may be provided to face the left and / or right direction of the battery module (10). Thus, when venting occurs in the battery cell (100), the venting gas may be discharged toward the side direction of the battery cell (100). For example, when venting occurs in the battery cell (100), the venting gas may be discharged toward the left and / or right direction of the battery cell (100).

[0069] A single battery module (10) may contain n battery cells (100). At this time, an adjacent battery module (10) may also contain n battery cells (100). That is, a plurality of battery modules (10) provided within a battery pack (1) may contain the same number of battery cells (100) inside.

[0070] In this way, according to the battery module (10) including a battery cell (100) of a vertical stacking structure, the conductive heat blocking effect can be improved compared to the battery module (10) including a battery cell (100) of a horizontal stacking structure. In addition, according to the above structure, adjacent battery modules (10) can be protected from convection and radiant heat. That is, according to the above configuration, if ignition occurs in a specific battery module (10) within the battery pack (1), the promotion of ignition to adjacent battery modules (10) can be suppressed. Accordingly, thermal propagation within the battery pack (1) can be effectively prevented, and at the same time, a stable heat dissipation state can be achieved.

[0071]

[0072] The battery module (10) may be provided in a state where it is mounted on the lower cover (21) of the pack housing (20). Specifically, the module housing (200) may be provided in a state where it is mounted on the lower cover (21) of the pack housing (20).

[0073] The module housing (200) may be configured to have an internal space capable of housing battery cells (100) inside. The module housing (200) may provide mechanical support for the stored battery cells (100) and protect them from external impacts.

[0074] The above module housing (200) includes a support plate (210), a side plate (220), an extension plate (230), and a top plate (240). The combination of the support plate (210), a pair of side plates (220), and the extension plate (230) can be arranged symmetrically with respect to the stack of the plurality of battery cells (100).

[0075] Referring to FIGS. 5 and 6, the support plate (210) may extend in a direction horizontal to the lower cover (21) of the pack housing (20). The support plate (210) may extend in a direction toward the outside of the battery module (10). Accordingly, the module housing (200) has a shape with an open bottom. Thus, the battery cell (100) housed inside the module housing (200) may be positioned to be in contact with the lower cover (21) of the battery pack (1). Accordingly, since no additional member is interposed between the battery cell (100) and the pack housing (20), the heat dissipation effect of the battery cell (100) can be improved.

[0076] The support plate (210) can be combined with the lower cover (21) of the pack housing (20) to secure the module housing (200) onto the lower cover (21) of the pack housing (20). The support plate (210) and the lower cover (21) of the pack housing (20) can be combined in various ways. For example, the support plate (210) and the lower cover (21) can be joined by welding. Alternatively, the support plate (210) and the lower cover (21) can be joined by bolting. The support plate (210) and the lower cover (21) can be joined in a face-to-face manner. That is, the support plate (210) can be joined in a face-to-face manner onto the lower cover (21) of the pack housing (20). The support plate (210) provides a joining surface that is joined onto the lower cover (21) of the pack housing (20).

[0077] The side plate (220) has a shape that extends upward from one end of the support plate (210). Preferably, the side plate (220) may have a shape that extends vertically upward from the inner end of the support plate (210). The side plate (220) may be configured to be located on both sides of a plurality of battery cells (100). That is, the side plate (220) may be provided as a pair. Specifically, the side plate (220) may be provided on the side facing the sealing portion (150) of the battery cell (100) and on the opposite side. The side plate (220) may extend in a direction parallel to the extension direction of the lead portion.

[0078] The above side plates (220) and a plurality of battery cells (100) may be spaced apart from each other to form a space between them. This space may be configured to trap flares and sparks ejected during swelling. For example, a pair of side plates (220) may form a space by facing each other with a gap slightly larger than the width of the battery cells (100).

[0079]

[0080] The extension plate (230) may extend in a horizontal direction relative to the lower cover (21) of the pack housing (20). The extension plate (230) may extend in a horizontal direction relative to the upper cover (23) of the pack housing (20). The extension plate (230) may extend in a direction toward the inside of the battery module (10). The extension plate (230) may extend in a direction opposite to the support plate (210).

[0081] Specifically, a support plate (210) may be provided at the lower end of the side plate (220). An extension plate (230) may be provided at the upper end of the side plate (220). The support plate (210) may extend in a direction toward the outside of the battery module (10) relative to the side plate (220). The extension plate (230) may extend in a direction toward the inside of the battery module (10) relative to the side plate (220). The extension plate (230) may be provided in a plate shape that extends approximately horizontally. The extension plate (230) may have a shape that is bent and extended vertically from the upper end of the side plate (220). The extension plate (230) may be provided in a shape that extends horizontally.

[0082] The extension plate (230) may be configured to be coupled with the top plate (240). The extension plate (230) may be configured to be in contact with the top plate (240) on its upper surface.

[0083] The extension plate (230) may be configured to form a predetermined spacing between a plurality of battery cells (100) provided inside the battery module (10). Alternatively, in an embodiment in which cushioning pads (300) are provided at both ends of the stack of the battery cells (100), the extension plate (230) may be provided at a predetermined spacing from adjacent cushioning pads (300) on the lower surface.

[0084] For example, the extension plate (230) and the plurality of battery cells (100) may be spaced apart from each other to form a space between them. This space may be configured to trap flares and sparks ejected during swelling. For example, the extension plate (230) may form a space by being spaced apart at a distance slightly greater than the height of the stack of battery cells (100). Such a space may form a venting path within the battery module (10). For example, if venting occurs in the left area of ​​the stack of multiple battery cells (100) based on FIG. 6, the venting gas may move into the space within the battery module (10). More specifically, the venting gas may move to the right area of ​​the stack of battery cells (100) along the venting path formed as the space within the module. In this case, the venting gas can be quickly discharged to the outside of the battery module (10) through the venting slit (220S) provided on the left side plate (220) as well as the venting slit (220S) provided on the right side plate (220).

[0085]

[0086] The top plate (240) can cover the upper part of a stack of multiple battery cells (100). The top plate (240) may be provided in a plate shape that extends approximately horizontally. The top plate (240) may be spaced apart from the upper cover (23) of the pack housing (20) by a predetermined distance. That is, a predetermined gap may be formed between the top plate (240) and the upper cover (23). The top plate (240) may be provided in a shape that extends horizontally.

[0087] The top plate (240) can be combined with the extension plate (230). The top plate (240) can be extended in a direction parallel to the extension plate (230). By combining the top plate (240) with the extension plate (230), a space can be formed to accommodate a battery cell (100) inside. The top plate (240) can be combined in a state of contact with the extension plate (230). For example, the upper surface of the extension plate (230) and the lower surface of the top plate (240) can be combined in a state of contact. That is, the battery module (10) of the present invention can be configured so that the upper part is detachable. The battery module (10) of the present invention can be configured so that the top plate (240) is detachable. Specifically, the top plate (240) can be provided in a state that is detachable from the extension plate (230).

[0088]

[0089] In one aspect of the present invention, the module housing (200) may include a metal material. For example, the module housing (200) may include at least one of steel and stainless steel.

[0090] According to the above configuration, the rigidity of the module housing (200) can be secured above a certain level. In addition, the melting point of the module housing (200) is increased, thereby ensuring the durability of the battery module (10). Furthermore, according to this configuration, the sealing performance of the module housing (200) can be improved. Accordingly, it is possible to effectively prevent adjacent battery modules (10) from igniting due to conductive heat generated from the ignited battery module (10). Accordingly, heat propagation inside the battery pack (1) can be effectively blocked.

[0091] In another aspect of the present invention, the support plate (210), a pair of side plates (220), and an extension plate (230) may be formed integrally. The support plate (210), a pair of side plates (220), and a top plate (240) may all be made of the same material. For example, the support plate (210), a pair of side plates (220), and an extension plate (230) may include at least one of steel and stainless steel.

[0092] In one embodiment of the present invention, the top plate (240) may be configured to include a different material from the support plate (210), a pair of side plates (220), and an extension plate (230). In another embodiment of the present invention, the top plate (240) may be configured to include the same material as the support plate (210), a pair of side plates (220), and an extension plate (230).

[0093]

[0094] Preferably, at least one venting slit (220S) may be provided on the side plate (220).

[0095] Referring to FIGS. 3, 5, and 6, the venting slit (220S) may extend in a direction parallel to the extension direction of the electrode lead (170) of the battery cell (100). Preferably, the venting slit (220S) may be provided in an area facing the sealing portion (150). The venting slit (220S) may extend in a direction parallel to the extension direction of the sealing portion (150). The venting slit (220S) may be provided in an area corresponding to the venting area of ​​the battery cell (100).

[0096] According to the above configuration, when a thermal event occurs in the battery cell (100), the flame and / or gas and / or spark emitted from the battery cell (100) can be smoothly discharged to the outside of the battery module (10) through the venting slit (220S). Since there is a gap between the battery modules (10), the flame and / or gas and / or spark emitted from the battery cell (100) can move into the gap within the battery pack (1).

[0097] In this regard, a predetermined spacing space may be formed between a plurality of battery modules (10). Specifically, a spacing space may be provided between the side plate (220) of one battery module (10) and the side plate (220) of an adjacent battery module (10). Meanwhile, a predetermined spacing space may be formed between the battery module (10) and the upper cover (23) of the battery pack (1). The spacing space provided within the battery pack (1) in this manner can function as a venting path. That is, a plurality of venting paths may be provided within the battery pack (1).

[0098] In this case, a venting path may be formed in the vertical direction of the above-mentioned gap space. For example, referring to FIG. 5, a venting path for the venting gas may be formed in the direction A shown in the drawing, that is, in the direction toward the upper cover (23). In this case, the venting gas may move horizontally along the venting path formed in the gap space between the upper cover (23) and the battery module (10).

[0099]

[0100] FIG. 7 is a drawing for explaining a battery module (10) according to another embodiment of the present invention.

[0101] Since the battery module (10) according to the present embodiment is similar to the battery module (10) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0102] In one aspect of the present invention, at least one venting slit (240S) may be provided on the top plate (240).

[0103] Referring to FIG. 7, the venting slit (240S) may extend in a direction parallel to the extension direction of the electrode lead (170) of the battery cell (100). The venting slit (240S) provided on the top plate (240) may extend in a direction parallel to the venting slit (220S) provided on the side plate (220). Preferably, the venting slit (240S) may be provided in an area facing the receiving portion of the battery cell (100). The venting slit (240S) may extend in a direction parallel to the extension direction of the sealing portion (150). The venting slit (240S) may be provided in a direction corresponding to the upper surface of the stack of the battery cell (100).

[0104] According to the above configuration, when a thermal event occurs in the battery cell (100), flames and / or gases and / or sparks ejected from the battery cell (100) can be smoothly discharged to the outside of the battery module (10) through the venting slit (240S).

[0105] A predetermined gap space may be formed between the battery module (10) and the upper cover (23) of the battery pack (1). The gap space provided within the battery pack (1) in this manner can function as a venting path. That is, a plurality of venting paths may be provided within the battery pack (1). Since a gap space exists between the battery module (10) and the upper cover (23), flames and / or gases and / or sparks ejected from the battery cell (100) can move into the gap space within the battery pack (1). In this case, the venting gas can move horizontally along the venting path formed in the gap space between the upper cover (23) and the battery module (10).

[0106]

[0107] FIG. 8 is a drawing for illustrating a battery module (10) according to another embodiment of the present invention.

[0108] Since the battery module (10) according to the present embodiment is similar to the battery module (10) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0109] In one aspect of the present invention, the top plate (240) may be configured such that at least a portion of the area is bendable. Specifically, the top plate (240) may include a bending line (240F) configured such that at least a portion of the area is bendable.

[0110] For example, referring to FIG. 8, the top plate (240) may be configured to be foldable along a central line. The central line may be provided with a notch line extending in a direction parallel to the extension direction of the electrode lead (170) of the battery cell (100). The notch line may be composed of a groove-shaped line carved inward from the upper surface of the top plate (240). In this way, the top plate (240) may be folded upward along the notch line.

[0111] In one embodiment, venting gas may be generated inside the battery module (10) due to a thermal event. At this time, if the amount of venting gas is small, thermal runaway can be prevented by discharging the venting gas through the venting slit (220S) provided in the side plate (220) or the top plate (240). Meanwhile, if the amount of venting gas contained inside the battery module (10) becomes too large and the internal pressure of the battery module (10) increases above a certain level, the top plate (240) may be opened to facilitate the discharge of the venting gas. At this time, the top plate (240) may be bent in a direction toward the outside of the battery module (10) along the bending line (240F), thereby opening a part of the module housing (200) of the battery module (10). To explain the embodiment of FIG. 8 as an example, the top plate (240) may be provided with a bending line (240F) in the center. At this time, the left portion relative to the bending line (240F) can be detached from the extension plate (230). Accordingly, the venting gas contained inside the battery module (10) can be quickly discharged to the outside of the battery module (10).

[0112]

[0113] FIG. 9 is a drawing for illustrating a battery module (10) according to another embodiment of the present invention.

[0114] Since the battery module (10) according to the present embodiment is similar to the battery module (10) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0115] In one embodiment of the present invention, the top plate (240) may be joined to the extension plate (230) by bolting. However, the method of joining between the top plate (240) and the extension plate (230) is not limited thereto, and it is understood that they may be joined by welding and / or mechanical joining methods.

[0116] Meanwhile, the support plate (210) may be joined to the lower cover (21) of the pack housing (20) by bolting. However, the method of joining between the support plate (210) and the lower cover (21) is not limited to this, and it is understood that they may be joined by welding and / or mechanical joining methods.

[0117]

[0118] FIG. 10 is a drawing for explaining a battery module (10) according to another embodiment of the present invention.

[0119] Since the battery module (10) according to the present embodiment is similar to the battery module (10) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0120] According to the present invention, the support plate (210), side plate (220), and extension plate (230) constituting the module housing (200) are configured identically, and only the width of the top plate (240) is adjusted differently, thereby accommodating battery cells (100) of various sizes. In the embodiment of FIG. 10, a battery cell (100) with a longer left-right width is included compared to the embodiment of FIG. 5. In this case, according to the present invention, the support plate (210), side plate (220), and extension plate (230) are manufactured identically to the existing ones, and only the left-right width of the top plate (240) is manufactured differently, thereby accommodating a battery cell (100) with a longer left-right width. That is, according to the present invention, by newly manufacturing only the top plate (240), a module housing (200) capable of accommodating all new battery cells (100) can be provided. With such a configuration, the manufacturing efficiency of the battery module (10) can be improved.

[0121]

[0122] FIG. 11 is a cross-sectional view of a battery pack (1) according to another embodiment of the present invention.

[0123] Referring to the embodiment of FIG. 11, a venting path for the venting gas can be formed in the direction A shown in the drawing, i.e., the direction toward the upper cover (23), and in the direction B, i.e., the direction toward the lower cover (21).

[0124] That is, the high-temperature flame and / or gas and / or spark emitted from the battery module (10) can travel through the venting path. After that, the high-temperature flame and / or gas and / or spark can finally be discharged to the outside of the battery pack (1) through the pack venting section provided in the battery pack (1).

[0125] In one aspect of the present invention, the pack venting portion may be provided on the upper cover (23) of the battery pack (1). Alternatively, the pack venting portion may be provided on the side cover (22) of the battery pack (1). In another embodiment of the present invention, with reference to FIG. 11, the pack venting portion may be provided on the lower cover (21) of the battery pack (1). For example, at least one venting hole may be provided on the lower cover (21), and high-temperature flames and / or gases and / or sparks traveling through the venting path within the battery pack (1) may be discharged to the outside of the battery pack (1) through the venting hole.

[0126] In one aspect of the present invention, the venting slit (220S) may be provided with a length corresponding to the length of the battery cell (100). Preferably, the venting slit (220S) may be provided with a length corresponding to the venting area of ​​the battery cell (100). According to the above configuration, even if venting occurs in any part of the battery cell (100), the venting slit (220S) is located in the corresponding part, so the venting gas can be immediately discharged to the outside of the battery module (10).

[0127] In another aspect of the present invention, the venting slit (220S) may be provided in the form of a plurality of venting slits (220S) arranged parallel to each other in one direction. In this case, the sum of the lengths of the plurality of venting slits (220S) may correspond to the length of the venting area of ​​the battery cell (100).

[0128]

[0129] FIG. 12 is a cross-sectional view of a battery pack (1) according to another embodiment of the present invention.

[0130] Since the battery pack (1) according to the present embodiment is similar to the battery pack (1) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0131] In another embodiment of the present invention, the venting slit (220S) may be provided in multiple numbers.

[0132] Referring to FIG. 12, the venting slits (220S) may be provided in multiple numbers spaced apart at a predetermined distance in the vertical direction. In the embodiment of FIG. 12, two rows of venting slits (220S) are provided on a single side plate (220). The two rows of venting slits (220S) are spaced apart at a predetermined distance in the vertical direction. With such a configuration, venting can be performed more smoothly.

[0133] For example, in an embodiment in which a venting slit (220S) is provided on an upper region based on the center of the side plate (220) and another venting slit (220S) is provided on a lower region based on the center of the side plate (220), if venting occurs among the battery cells (100) located in the upper region, venting can be performed quickly through the venting slit (220S) provided on the upper region. On the other hand, if venting occurs among the battery cells (100) located in the lower region, venting can be performed quickly through the venting slit (220S) provided on the lower region.

[0134] Although the embodiment of FIG. 12 is described as being limited to an embodiment in which two rows of venting slits (220S) are provided on one side plate (220), the scope of the present invention is not limited thereto, and if m rows of venting slits (220S) are provided in the vertical direction, it will be considered to be included within the scope of the present invention.

[0135]

[0136] FIG. 13 is a cross-sectional view of a battery pack (1) according to another embodiment of the present invention.

[0137] Since the battery pack (1) according to the present embodiment is similar to the battery pack (1) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0138] In one aspect of the present invention, a support plate (210) of one battery module (10) may be provided in a state of overlap with a support plate (210) of an adjacent battery module (10). Preferably, a support plate (210) of one battery module (10) may be fixed on a lower cover (21) of a battery pack (1) in a state of overlap with a support plate (210) of an adjacent battery module (10).

[0139] Specifically, the module housing (200) may include a left support plate (210) and a right support plate (210). In this case, the left support plate (210) and the right support plate (210) may be configured to have different heights from each other. For example, referring to FIG. 13, the right support plate (210) may be provided in a state of contact with the lower cover (21) of the pack housing (20). On the other hand, the left support plate (210) may be provided in a form that is raised at a predetermined height on the lower cover (21). In this case, the left support plate (210) may be provided in a form that is contact with the right support plate (210) of an adjacent battery module (10). That is, the distance between the lower cover (21) of the pack housing (20) and the left support plate (210) may be configured to correspond to the thickness of the right support plate (210). In this case, a right support plate (210) can be placed on the lower cover (21) of the pack housing (20). And, a left support plate (210) can be placed on the right support plate (210). That is, according to the above configuration, one module housing (200) and the module housing (200) of an adjacent battery module (10) can be provided in a form that overlaps each other.

[0140] That is, according to the above configuration, the width of the spacing space can be provided to correspond to the horizontal extension length of the support plate (210). Accordingly, the width of the spacing space between the battery modules (10) can be appropriately adjusted by adjusting the horizontal extension length of the support plate (210).

[0141] According to the above configuration, the module housing (200) of one battery module (10) and the module housing (200) of an adjacent battery module (10) can be fixed to each other. More preferably, the module housing (200) of one battery module (10) and the module housing (200) of an adjacent battery module (10) can be fixed together with the lower cover (21) of the battery pack (1) at once. For example, the support plate (210) of one battery module (10), the support plate (210) of the module housing (200) of an adjacent battery module (10), and the lower cover (21) of the battery pack (1) can be fastened together at once by bolting. According to such a configuration, the battery module (10) can be easily fixed on the lower cover (21) of the battery pack (1). In addition, the spacing between the battery modules (10) can be configured to be constant. In addition, since the lower cover (21) and the two layers of support plates (210) are fixed together, a more secure fixation is possible.

[0142]

[0143] FIG. 14 is a cross-sectional view of a battery pack (1) according to another embodiment of the present invention.

[0144] Since the battery pack (1) according to the present embodiment is similar to the battery pack (1) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment are omitted, and the following description focuses on the differences from the preceding embodiment.

[0145] In one aspect of the present invention, the battery pack (1) may further include a thermal conductive layer (30). The thermal conductive layer (30) may be provided in a state interposed between a plurality of battery cells (100) and a lower cover (21) of the battery pack (1). For example, the thermal conductive layer (30) may include a thermal resin and / or a thermal interface material (TIM) and / or a thermal spreader. The thermal interface material may be, for example, at least one of a heat dissipation pad, a heat dissipation sheet, a heat dissipation grease, a thermally conductive adhesive, and a phase change material.

[0146] With this configuration, the heat exchange performance between the battery cell (100) and the lower cover (21) can be further improved. As a result, the heat transferred to the lower cover (21) can be smoothly dissipated to the outside of the battery pack (1).

[0147] In another aspect of the present invention, the battery module (10) may include a buffer pad (300) between the battery cells (100); on the upper part of the stack of battery cells (100); and on the lower part of the stack of battery cells (100). For example, the battery module (10) may include at least one buffer pad between the battery cells (100). For example, the battery module (10) may include a buffer pad (300) on at least one of the upper and lower parts of the stack of battery cells (100). That is, the buffer pads may be provided in a plurality within the battery module (10). Specifically, the buffer pad (300) is located on at least one of the upper and lower parts of the stacked battery cells (100), and may be interposed between the battery cells (100) as needed. Such a buffer pad (300) is made of a material whose volume changes easily according to an external pressure, and may be, for example, a sponge or a non-woven fabric.

[0148]

[0149] Meanwhile, in the drawings of the present invention, components such as busbars for electrical connection, cooling units, and power terminals have been omitted for the convenience of drawing. Additionally, the battery pack (1) may further include various components, such as components of a battery pack (1) known at the time of filing the present invention, such as a BMS, pack case, relay, and current sensor.

[0150]

[0151] FIG. 15 is a drawing for explaining a vehicle (V) including the battery pack (1) of FIG. 1.

[0152] Referring to FIG. 15, a vehicle (V) according to one embodiment of the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes a battery pack (1) according to one embodiment of the present invention. The vehicle (V) includes four-wheeled vehicles and two-wheeled vehicles. The vehicle (V) operates by receiving power from the battery pack (1) according to one embodiment of the present invention. In addition, the vehicle (V) according to the present invention may further include various other components included in the vehicle in addition to the battery cell (100) or battery pack (1). For example, the vehicle (V) according to the present invention may further include, in addition to the battery cell (100) according to the present invention, a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0153]

[0154] Meanwhile, although terms indicating direction such as up and down have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to a person skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0155] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

[0156] [Explanation of the symbol]

[0157] V Car

[0158] 1 battery pack

[0159] 10 battery modules

[0160]

[0161] 20 Pack Housing

[0162] 21 lower cover

[0163] 22 side cover

[0164] 23 Upper cover

[0165] 30 thermal conductive layer

[0166]

[0167] 100 battery cells

[0168] 110 electrode assembly

[0169] 130 reception units

[0170] 150 sealing part

[0171] 170 electrode leads

[0172]

[0173] 200 module housing

[0174] 210 support plate

[0175] 220 side plate

[0176] 220S Venting Slit

[0177] 230 Extension Plate

[0178] 240 Top Plate

[0179] 240S Venting Slit

[0180] 300 cushioning pads

Claims

1. A battery module comprising a plurality of battery cells arranged in a stacked state in the vertical direction, and a module housing having an open bottom and a detachable top; and Pack housing for accommodating the above battery module A battery pack including 2. In Paragraph 1, The above battery cell is, Electrode assembly; A receiving portion for accommodating the above electrode assembly; A sealing portion formed around the perimeter of the above-mentioned receiving portion; and A pair of electrode leads connected to the electrode assembly and drawn out to the outside of the sealing part A battery pack characterized by including 3. In Paragraph 2, A battery pack characterized by the fact that the receiving portion of the battery cell is stacked in an up-and-down direction while facing the receiving portion of an adjacent battery cell.

4. In Paragraph 1, The above module housing is, A support plate coupled in contact with the lower cover of the above-mentioned pack housing; A side plate extending upward from one end of the above-mentioned support plate; An extension plate having a shape that is bent and extended vertically from the upper end of the above side plate; and A top plate configured to be coupled with the above-mentioned extension plate and configured to cover the upper part of a stack of multiple battery cells. A battery pack characterized by including 5. In Paragraph 4, A battery pack characterized in that the extension plate extends in the opposite direction to the support plate.

6. In Paragraph 4, A battery pack characterized in that the top plate is provided in a detachable state from the extension plate.

7. In Paragraph 4, A battery pack characterized in that the top plate is joined in contact with the extension plate.

8. In Paragraph 4, A battery pack characterized in that the top plate is configured such that at least some area is bendable.

9. In Paragraph 4, The battery cell comprises: an electrode assembly; a receiving portion for accommodating the electrode assembly; a sealing portion formed around the perimeter of the receiving portion; and a pair of electrode leads connected to the electrode assembly and extended to the outside of the sealing portion. A battery pack characterized by having at least one venting slit extending in a direction parallel to the extension direction of the sealing portion on the side plate.

10. In Paragraph 4, A battery pack characterized by having at least one venting slit on the top plate.

11. In Paragraph 4, A battery pack characterized by having a gap space formed between the side plate of one battery module and the side plate of an adjacent battery module to form a venting path.

12. In Paragraph 1, A battery pack characterized by having a predetermined gap formed between the battery module and the upper cover of the battery pack to form a venting path.

13. In Paragraph 4, A battery pack characterized in that the support plate of one battery module is provided in a state overlapping with the support plate of an adjacent battery module.

14. In Paragraph 1, The above battery module is Between the above battery cells; The upper part of the stack of the battery cells above; and The lower part of the stack of the above battery cells A battery pack characterized by including a buffer pad in at least one of the following.

15. An automobile characterized by comprising at least one battery pack described in any one of claims 1 to 14.

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