Battery module and battery pack including the same

Abstract

A battery module and a battery pack including the same are provided. The battery module includes a battery pack in which battery cells are arranged in a direction, an end plate including a first body arranged on a side of the battery pack in the direction and facing the battery pack, a second body spaced apart from the first body, and a deformable portion compressively deformable between the first body and the second body. At least one of the first body or the second body includes a connection protrusion protruding toward the deformable portion and is capable of being engaged with the deformable portion.

Description

Technical Field

[0001] The disclosure relates to a battery module and a battery pack including the battery module. Background Technology

[0002] Unlike primary batteries, which are non-rechargeable, secondary batteries are rechargeable and dischargeable.

[0003] Low-capacity rechargeable batteries are used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity rechargeable batteries are widely used as motor drive power sources and energy storage batteries in hybrid vehicles, electric vehicles, and other similar applications.

[0004] Based on the operation of secondary batteries, individual battery cells can repeatedly expand and contract, and various methods are being sought to improve the durability of battery modules that include such secondary batteries.

[0005] The information disclosed above in the technical section serving as the background of the disclosure is intended only to improve the understanding of the background of the disclosure and may therefore include information that does not constitute prior art. Summary of the Invention

[0006] A battery module and a battery pack including the battery module are disclosed. In the battery module, a stacked structure in which a first body, a second body, and a deformable portion of an end plate are arranged in one direction is used to absorb the expansion of the battery cells.

[0007] However, the technical problem to be solved by the disclosure is not limited to this problem, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

[0008] According to a disclosed embodiment, a battery module includes a battery pack in which a plurality of battery cells are arranged in one direction and an end plate. The end plate includes a first body arranged on one side of the battery pack in that direction and facing the battery pack, a second body spaced apart from the first body, and a deformable portion between the first body and the second body for compressibility and deformation. At least one of the first body or the second body includes a connecting protrusion projecting toward the deformable portion and capable of engaging with the deformable portion.

[0009] In some embodiments, the connecting protrusion may be located relatively closer to the edge of the first or second body than to the center of the first or second body.

[0010] In some embodiments, the connecting protrusion may be on at least one of a first surface of the first body facing the second body or a second surface of the second body facing the first body.

[0011] In some embodiments, the stiffness of the deformable portion can increase from the center of the deformable portion toward the edge of the deformable portion.

[0012] In some embodiments, the deformable portion may include: an absorbent member in contact with the surfaces of a first body and a second body; and a support member connected to the outside of the absorbent member and having a higher rigidity than the absorbent member.

[0013] In some embodiments, when viewed from the direction described, the electrode assembly housed inside the battery cell may be located inside the outer periphery of the absorption member.

[0014] In some embodiments, the support member may be adjacent to the battery terminal of the battery cell.

[0015] In some embodiments, the connecting protrusion may have a shape that increases in width outwards.

[0016] In some embodiments, the connection protrusion may extend in the height direction of the battery cell.

[0017] In some embodiments, the deformable portion may include a connection groove having a predetermined depth, the connection groove being configured to allow a connection protrusion to be inserted therein.

[0018] According to the disclosed embodiments, the battery pack includes a battery module and a pack housing containing the battery module. Each battery module includes a battery pack in which a plurality of battery cells are arranged in one direction, and an end plate. The end plate includes a first body arranged on one side of the battery pack and facing the battery pack in that direction, a second body spaced apart from the first body, and a deformable portion between the first body and the second body for compressibility and deformation. At least one of the first body or the second body includes a connecting protrusion projecting toward the deformable portion for engagement with the deformable portion.

[0019] In some embodiments, the connecting protrusion may be closer to the edge of the first or second body than to the center of the first or second body.

[0020] In some embodiments, the connecting protrusion may be on at least one of a first surface of the first body facing the second body or a second surface of the second body facing the first body.

[0021] In some embodiments, the stiffness of the deformable portion can increase from the center of the deformable portion toward the edge of the deformable portion.

[0022] In some embodiments, the deformable portion may include: an absorbent member in contact with the surface of a first or second body; and a support member connected to the outside of the absorbent member and having a higher rigidity than the absorbent member.

[0023] In some embodiments, when viewed from the direction described, the electrode assembly housed inside the battery cell may be located inside the outer periphery of the absorption member.

[0024] In some embodiments, the support member may be adjacent to the battery terminal of the battery cell.

[0025] In some embodiments, the connecting protrusion may have a shape that increases in width outwards.

[0026] In some embodiments, the connection protrusion may extend in the height direction of the battery cell.

[0027] In some embodiments, the deformable portion may include a connection groove having a predetermined depth, the connection groove being configured to allow a connection protrusion to be inserted therein. Attached Figure Description

[0028] The accompanying drawings illustrate preferred embodiments of the disclosure and, together with the detailed description of the disclosure that follows, serve to further understand the technical ideas of the disclosure, such that the disclosure should not be construed as limited to what is shown in these drawings: Figure 1 A battery pack including a battery module is schematically illustrated according to an embodiment of the present disclosure; Figure 2 A battery module according to an embodiment of the present disclosure is shown; Figure 3 yes Figure 2 An exploded perspective view of the battery module; Figure 4 yes Figure 3 An exploded perspective view of an embodiment of the end plate; Figure 5 yes Figure 4 Floor plan; Figure 6 It is shown in detail Figure 4 A view of some components; Figure 7 This is an exploded perspective view of an end plate according to another disclosed embodiment; Figure 8 yes Figure 7 Floor plan; and Figure 9 It is shown in detail Figure 7 A view of some components. Detailed Implementation

[0029] The disclosed embodiments will be described in detail below with reference to the accompanying drawings. The terms and words used in this specification and the foregoing claims should not be construed as limited to their general or dictionary meanings, but should be interpreted as meanings and concepts consistent with the disclosed technical ideas, based on the principle that the inventors can appropriately define terms and concepts to best describe their disclosures. Therefore, the embodiments described in this specification and the constructions shown in the drawings are merely some of the most preferred embodiments disclosed and do not represent all the disclosed technical ideas. It should be understood that various equivalents and modifications may exist at the time of filing this application.

[0030] As used herein, “comprising,” “including,” and / or variations thereof indicate the presence of the mentioned shapes, quantities, steps, operations, components, and / or groups, without excluding the presence or addition of one or more different shapes, quantities, operations, components, and / or groups.

[0031] To aid in understanding the disclosure, the accompanying drawings are not shown to scale, but the dimensions of some components may be exaggerated. In different embodiments, the same reference numerals may be assigned to the same components.

[0032] The statement that two comparison targets are “identical” to each other can mean that they are “substantially identical”. Therefore, the situation where they are “substantially identical” can include cases where they have a deviation considered to be low (e.g., 5% or less). In the case where the uniformity parameter is uniform over a selected region, this might mean that it is uniform from an average perspective.

[0033] Although various components may be described using terms such as "first," "second," etc., these components are not limited by these terms. These terms are only used to distinguish one component from others, and unless specifically stated otherwise, a first component may be a second component.

[0034] Throughout this specification, unless otherwise stated, each component may be singular or plural.

[0035] When a component is arranged on top of (or below) another component or on top of (or below) another component, this can mean not only that the component is arranged adjacent to the top surface (or bottom surface) of the other component, but also that another component can be placed between the other component and the component arranged on (or below) the other component.

[0036] When a component is described as being “linked,” “combined,” or “connected” to another component, it should be understood that these components are directly connected to each other or can be directly connected to each other, or that these components can be “linked,” “combined,” or “connected” to each other through another component. In the case of one part being electrically combined with another part, this can include not only cases where they are directly connected to each other, but also cases where they are connected using another element between them.

[0037] Throughout this specification, unless otherwise specifically stated, "A and / or B" may mean A, B, or A and B. That is, "and / or" may include all or any combination of the listed items. "C to D" may mean at least C but no more than D, unless otherwise specifically stated.

[0038] The terminology used herein is for the purpose of describing the disclosed embodiments and is not intended to limit the disclosure.

[0039] In the following text, the X-axis, Y-axis, and Z-axis are not limited to three axes in an orthogonal coordinate system, and can be interpreted in a general sense that includes them. For example, the X-axis, Y-axis, and Z-axis can be orthogonal to each other, but can also refer to different directions that are not orthogonal to each other.

[0040] For ease of description, the X-axis can be defined as the length direction of the battery module, the Y-axis can be defined as the width direction of the battery module, and the Z-axis can be defined as the height direction of the battery module. The X-axis can be substantially parallel to the direction in which the multiple battery cells are arranged.

[0041] Figure 1 A battery pack including a battery module is schematically illustrated according to an embodiment of the present disclosure.

[0042] Reference Figure 1 The battery pack 1 may include a battery module 10 and a pack housing 20.

[0043] The battery pack 1 may include multiple battery modules 10. The battery pack 1 may store electrical energy therein.

[0044] Battery pack 1 can be electrically connected to an external device that requires power. Battery pack 1 can supply power to the electrically connected external device. Battery pack 1 can be used as a power source for the external device.

[0045] Multiple battery modules 10 can be electrically connected to each other via module busbars or the like. In one or more embodiments, the multiple battery modules 10 can be connected in series and / or in parallel. An external device connected to the battery pack 1 can receive electrical energy with an output regulated by the connections between the multiple battery modules 10.

[0046] Despite Figure 1The diagram shows a battery pack 1 comprising six battery modules 10, but this disclosure is not limited thereto. The number of battery modules 10 included in the battery pack 1 and the connection method for multiple battery modules 10 can be selected as needed.

[0047] Reference Figure 1 The housing 20 provides space to accommodate the battery module 10. The housing 20 can spatially separate the battery module 10 from the outside, thereby minimizing the impact of the external environment on the battery module 10.

[0048] The outer casing 20 can support the battery module 10. For example, the outer casing 20 can have a receiving space with a shape corresponding to the appearance of the battery module 10.

[0049] The housing 20 can electrically connect the battery module 10 to an external device. For example, the housing 20 can use connection terminals for connecting to an external device to electrically connect the battery module 10 to an external device.

[0050] Figure 2 A battery module according to an embodiment of the present disclosure is shown. Figure 3 yes Figure 2 An exploded perspective view of the battery module. Figure 4 yes Figure 3 Exploded perspective view of the end plate. Figure 5 yes Figure 4 Floor plan. Figure 6 It is shown in detail Figure 4 A view of some components.

[0051] Reference Figure 2 and Figure 3 The battery module 10 may include a battery pack 100, an end plate 200, and a side plate 300.

[0052] Reference Figure 2 and Figure 3 The battery pack 100 may include multiple battery cells 110. The multiple battery cells 110 may be arranged along the length of the battery pack 10 to maximize the energy density of the battery pack 10.

[0053] Multiple battery cells 110 can be electrically connected to each other. Multiple battery cells 110 can be connected in series and / or in parallel, thereby allowing control over the output of electrical energy supplied to the outside.

[0054] The battery cell 110 can store electrical energy by including a positive electrode, a negative electrode, etc. The battery cell 110 can receive electrical energy from the outside and store it therein, or transfer the stored electrical energy to another component.

[0055] Despite Figures 1 to 3The diagram shows a battery cell 110 with a cuboid shape, but the appearance of the battery cell 110 is not limited to this. For example, the battery cell 110 may have a cylindrical or pouch shape. However, for ease of description, the following will primarily describe examples of battery cells 110 with a cuboid shape.

[0056] Reference Figures 2 to 5 The end plate 200 can be arranged on the side of the battery pack 100. In some embodiments, the end plate 200 can be arranged on the side of the battery pack 100 in the direction in which the battery cells 110 are stacked.

[0057] The end plate 200 can contact the outermost battery cell 110 among a plurality of battery cells 110 arranged in one direction. Therefore, the end plate 200 can support the battery pack 100 in the direction in which the battery cells 110 are stacked.

[0058] Reference Figure 2 and Figure 3 The end plates 200 can be configured as a pair of end plates 200. The pair of end plates 200 can be arranged on opposite sides (or two ends) of the battery pack 100 in the direction of stacking of the battery cells 110 (e.g., the X-axis direction).

[0059] A pair of end plates 200 can be connected to each other via side plates 300. The pair of end plates 200 can be connected to each other to support the battery pack 100 in opposite directions. Therefore, the battery pack 100 can be firmly supported compared to the case where the end plates 200 and side plates 300 are not provided.

[0060] In an embodiment, the end plate 200 may include a first body 210, a second body 220, and a deformable portion 230.

[0061] Reference Figure 3 The first body 210 may be arranged to face the battery pack 100. In some embodiments, the first body 210 may contact the surface of the battery cell 110 located at the outermost end of the battery pack 100 (e.g., the outermost battery cell 100 in the X-axis direction). The first body 210 may support the outermost battery cell 110 in the length direction of the battery module 10.

[0062] The first body 210 can be disposed between the battery pack 100 and the deformable portion 230. When the battery cell 110 expands, the first body 210 can be pushed along the length of the battery module 10 to press the deformable portion 230. That is, the first body 210 can transmit the expansion force generated by the expansion of the battery cell 110 to the deformable portion 230.

[0063] Reference Figures 2 to 4The first body 210 may have a first surface 211 facing the second body 220. That is, the first surface 211 may be arranged to face the deformable portion 230.

[0064] The first body 210 can contact and support the deformable part 230 through the first surface 211. That is, the first body 210 can make surface contact with the deformable part 230 through the first surface 211, thereby strengthening the connection between the first body 210 and the deformable part 230.

[0065] Reference Figures 4 to 6 The first body 210 may have a connecting protrusion. In some embodiments, the first connecting protrusion 2101 may be formed in the first body 210 to protrude toward the deformable portion 230. The first connecting protrusion 2101 is configured to connect the first body 210 to the deformable portion 230.

[0066] The first connecting protrusion 2101 can contact the deformable portion 230. The first connecting protrusion 2101 can maximize (or at least increase) the contact area between the first body 210 and the deformable portion 230. That is, the first connecting protrusion 2101 can contact and support the deformable portion 230. Therefore, the connection between the first body 210 and the deformable portion 230 can be strengthened.

[0067] In this embodiment, the first connecting protrusion 2101 can be inserted into the connecting groove 2301 in the deformable portion 230. When the first connecting protrusion 2101 contacts the inner circumferential surface of the connecting groove 2301, the contact area between the first body 210 and the deformable portion 230 can be maximized (or at least increased). Therefore, the first connecting protrusion 2101 can firmly support the position of the deformable portion 230 relative to the first body 210.

[0068] The first connecting protrusion 2101 may be on the first surface 211. The first connecting protrusion 2101 may be on the first surface 211 facing the deformable portion 230 and may be connected to the deformable portion 230.

[0069] In one or more embodiments, the height of the first connecting protrusion 2101 protruding to connect to the deformable portion 230 can be minimized (or at least reduced). Therefore, the structure of the end plate 200 can be made more compact, and structural stability can be improved.

[0070] In the following text, "width of the connecting protrusion" can be defined as the length of the connecting protrusion in the width direction of the battery module 10. In other words, "width of the connecting protrusion" can be defined as the length of the connecting protrusion in the Y-axis direction.

[0071] Reference Figure 5The first connecting protrusion 2101 may have a shape that increases in width outward (e.g., a shape that narrows inward). In other words, the first connecting protrusion 2101 may have a shape in which the width increases in the direction of protrusion from the first body 210 (e.g., the X-axis direction).

[0072] For example, the first connecting protrusion 2101 may have a first width W1 at the point where it connects to the first body 210, and the first connecting protrusion 2101 may have a second width W2 greater than the first width W1 at an end spaced apart from the first body 210. In one or more embodiments, the first connecting protrusion 2101 may have a dovetail shape. Therefore, the first connecting protrusion 2101 can be inserted into the inside of the connecting groove 2301 formed in the deformable portion 230 to support the deformable portion 230 along the length of the battery module 10. Thus, the deformable portion 230 can hook onto the first body 210, such that the relative position of the deformable portion 230 with respect to the first body 210 can be fixed.

[0073] In an embodiment, the first connecting protrusion 2101 may extend in the height direction (e.g., the Z-axis direction) of the battery module 10. For example, the first connecting protrusion 2101 may be connected to one surface in the height direction of the first body 210 and another surface opposite thereto.

[0074] When the first connecting protrusion 2101 is formed to extend in the height direction of the battery module 10, the area of ​​the first connecting protrusion 2101 facing the width direction of the battery module 10 can be maximized (or at least increased). In other words, the area of ​​the first connecting protrusion 2101 supporting the deformable portion 230 in the width direction of the battery module 10 can be maximized (or at least increased). Therefore, the relative position of the deformable portion 230 with respect to the first body 210 can be firmly supported.

[0075] In the following text, "edge" can be defined as the outer boundary when a particular component is viewed along the length of the battery module 10.

[0076] Reference Figures 4 to 6 The first connecting protrusion 2101 can be positioned relatively closer to the edge of the first surface 211 than to the center of the first surface 211. When the first connecting protrusion 2101 is positioned closer to (e.g., near) the edge, the side of the deformable portion 230 positioned relatively closer to the center of the first surface 211 can have a greater thickness than the edge.

[0077] Therefore, in the event of bulging in the battery cell 110, the thickness of the portion of the deformable portion 230 overlapping the portion where the expansion of the battery cell 110 mainly occurs can be relatively large. Thus, in the event of bulging, the expansion of the battery cell 110 caused by the deformable portion 230 can be effectively absorbed by the relatively thicker portion of the deformable portion 230.

[0078] In the following text, "centerline" can be defined as a virtual line that passes through the center point of the width of the first body 210 or the second body 220 and extends in the height direction of the battery module 10. In other words, "centerline" can be defined as an imaginary line that passes through the center point of the width of the first body 210 or the second body 220 and is parallel to (or substantially parallel to) the Z-axis.

[0079] Reference Figure 6 The first connecting protrusion 2101 can be arranged at a position spaced at a predetermined distance from the center line CL. In some embodiments, the first connecting protrusion 2101 can be positioned relatively closer to the width direction edge of the first body 210 than closer to the center line CL. Therefore, in the event of bulging, the amount of expansion of the battery cell 110 absorbed by the deformable portion 230 can be maximized (or at least increased), and the structural stability of the battery module 10 can be improved.

[0080] Reference Figures 4 to 6 The first connecting protrusion 2101 can be configured as a plurality of first connecting protrusions 2101 spaced apart from each other. The first body 210 may include a plurality of first connecting protrusions 2101 to maximize (or at least increase) the area in contact with the deformable portion 230. Therefore, the relative position of the deformable portion 230 with respect to the first body 210 can be more firmly supported.

[0081] Reference Figure 6 The first surface 211 may have a connection region A on which a first connection protrusion 2101 is formed. That is, a plurality of first connection protrusions 2101 may be arranged within the connection region A and on the first surface 211. In one or more embodiments, the connection region A may be a first connection region and a second connection region.

[0082] The connecting region A can be a region that is relatively closer to the edge than the center of the first surface 211. Because the multiple first connecting protrusions 2101 are arranged near the edge, the side of the deformable portion 230 that is relatively closer to the center of the first body 210 can have a thickness that is relatively thicker than the edge.

[0083] Reference Figure 6The connecting area A can cover the area between a point on the first surface 211 that is spaced at a preset distance from the center line CL and the end (or edge) of the first surface 211.

[0084] For example, the distance between the side of the connecting region A that is separated from the center line CL and the center line CL can be a first distance D1, and the distance between the side (or edge) of the connecting region A that is furthest from the center line CL and the center line CL can be a second distance D2.

[0085] The second distance D2 can substantially correspond to the distance between the center line CL and the edge of the first surface 211 located in the width direction of the battery module 10. The first distance D1 can have a value greater than half of the second distance D2.

[0086] Therefore, in the event of bulging in the battery cell 110, the thickness of the portion of the deformable portion 230 overlapping with the portion of the battery cell 110 where the expansion mainly occurs (e.g., around the center line CL) can be maximized or at least increased. Thus, in the event of bulging, the expansion of the battery cell 110 can be effectively absorbed by the deformable portion 230.

[0087] Reference Figure 4 and Figure 5 The second body 220 can be spaced apart from the first body 210. The second body 220 can be spaced apart from the first body 210 by a predetermined distance to provide space for the deformable part 230 to be arranged between the first body 210 and the second body 220.

[0088] In other words, the second body 220 can be arranged separately from the first body 210, and the deformable portion 230 is located between the second body 220 and the first body 210 (e.g., the first body 210 and the second body 220 can be on opposite sides of the deformable portion 230). When the battery cell 110 expands, thus pressurizing the deformable portion 230 by the first body 210, the second body 220 can pressurize the deformable portion 230 in a direction opposite to the first body 210. The deformable portion 230 can deform when pressurized, thereby absorbing the expansion of the battery cell 110.

[0089] The second body 220 may have a second surface 221 facing the first body 210. The second body 220 may contact the deformable portion 230 through the second surface 221. The first body 210 and the second body 220 may press the deformable portion 230 in a direction facing each other to cause compressive deformation of the deformable portion 230.

[0090] The first surface 211 and the second surface 221 can be arranged to face each other. The deformable portion 230 arranged between the first body 210 and the second body 220, positioned relatively closer to the center line CL, can have a constant thickness in the width direction of the battery module 10. Therefore, the deformable portion 230 can uniformly absorb the expansion of the battery cell 110 due to bulging in the length direction of the battery module 10.

[0091] Reference Figure 4 and Figure 5 The second body 220 may have a connecting protrusion. In some embodiments, the second connecting protrusion 2201 may be in the second body 220 and may protrude toward the deformable portion 230. The second connecting protrusion 2201 may be configured to engage the deformable portion 230.

[0092] The structure of the second body 220 having the second connecting protrusion 2201 can correspond to the structure of the first body 210 described above. Therefore, in the following text, redundant parts of the structure of the second body 220 will not be described or will be briefly described, and the explanation will focus on the differences between them.

[0093] A second connecting protrusion 2201 may be formed on the second surface 221. The second connecting protrusion 2201 may be formed on the second surface 221 facing the deformable portion 230 and may be connected to the deformable portion 230. The second connecting protrusion 2201 may be connected to the deformable portion 230 and protrude from the second surface 221, thereby making the end plate 200 structurally compact and improving the structural stability of the end plate 200.

[0094] The second connecting protrusion 2201 may have a shape that increases in width outwards and may be formed to extend in the height direction of the battery module 10. That is, the second connecting protrusion 2201 may hook the deformable portion 230 and maximize (or at least increase) the contact area between the second body 220 and the deformable portion 230, thereby firmly supporting the position of the deformable portion 230 relative to the second body 220.

[0095] The second connecting protrusion 2201 can be positioned relatively closer to the edge of the second surface 221 than to the center of the second surface 221. For example, the second connecting protrusion 2201 can be spaced apart from the centerline CL of the second surface 221 by a predetermined distance. Therefore, the thickness of the portion of the deformable portion 230 that overlaps with the portion where the expansion of the battery cell 110 mainly occurs (e.g., around the centerline) can be maximized (or at least increased), and the expansion of the battery cell 110 can be effectively absorbed by the deformable portion 230.

[0096] In an embodiment, the second connecting protrusion 2201 may be configured as a plurality of second connecting protrusions 2201 and may be arranged on the connecting area A of the second surface 221.

[0097] The connection region A on the second surface 221 can be a region relatively closer to the edge than the center of the second surface 221. For example, the connection region A can cover the region between a line spaced a predetermined distance from the center line CL and the edge of the second surface 221 spaced apart in the width direction. Therefore, the expansion of the battery cell 110 due to bulging can be effectively absorbed by the deformable portion 230.

[0098] Despite Figures 2 to 5 The diagram shows connecting protrusions 2101 and 2201 formed on each of the first body 210 and the second body 220, but the structure of the end plate 200 is not limited thereto.

[0099] For example, a connecting protrusion may be formed on either the first body 210 or the second body 220. Because the connecting protrusion is formed on either the first body 210 or the second body 220, a space can be provided in which the deformable portion 230 can be arranged between the first body 210 and the second body 220. Therefore, the amount of expansion of the battery cell 110 absorbed by the end plate 200 can be increased.

[0100] Reference Figures 3 to 5 The deformable portion 230 can be arranged (e.g., clamped) between the first body 210 and the second body 220. The first body 210, the second body 220, and the deformable portion 230 can be arranged along the length direction (e.g., the X-axis direction) of the battery module 10. Therefore, when the battery cell 110 expands, the first body 210 and the second body 220 can pressurize the deformable portion 230 along the length direction of the battery module 10.

[0101] The deformable portion 230 may have regions corresponding to the first surface 211 and the second surface 221. In some embodiments, the deformable portion 230 may contact the first surface 211 of the first body 210 and the second surface 221 of the second body 220, respectively. That is, the deformable portion 230 may contact and support each portion of the first surface 211 and the second surface 221. Therefore, the deformable portion 230 can minimize (or at least reduce) deformation by applying different forces to each portion of the first body 210 and the second body 220.

[0102] The deformable portion 230 can be compressively deformed. In some embodiments, the stiffness of the deformable portion 230 may be less than the stiffness of the first body 210 or the second body 220, such that the strain of the deformable portion 230 caused by externally applied pressure may be greater than the strain of the first body 210 or the second body 220.

[0103] The deformable portion 230 can be compressed and deformed in response to the expansion of the battery cell 110 by the pressure applied by the first body 210 and the second body 220. When the battery cell 110 expands, the deformable portion 230 can be compressed so that the first body 210 can partially move, thereby absorbing the expansion of the battery cell 110. Therefore, the structural stability of the battery module 10 can be ensured.

[0104] Reference Figure 4 and Figure 5 The connecting protrusion 2101 or 2201 can be inserted into the connecting groove 2301, which can be in the deformable portion 230. The deformable portion 230 allows the connecting protrusion 2101 or 2201 to be inserted into the connecting groove 2301, thereby connecting to at least one of the first body 210 or the second body 220.

[0105] As described above, the connecting protrusion 2101 or 2201 may be formed on at least one of the first body 210 or the second body 220, but for ease of description, the following description will focus on an embodiment in which the first body 210 includes the first connecting protrusion 2101 and the second body 220 includes the second connecting protrusion 2201.

[0106] The connecting grooves 2301 can be formed at positions corresponding to the first connecting protrusion 2101 on the first surface 211 and the second connecting protrusion 2201 on the second surface 221, respectively. The first connecting protrusion 2101 and the second connecting protrusion 2201 can be inserted into the connecting grooves 2301, so that the first body 210, the second body 220, and the deformable portion 230 can be aligned and joined together. Therefore, the structural stability of the end plate 200 can be improved.

[0107] The connecting groove 2301 may have a shape corresponding to the first connecting protrusion 2101 and the second connecting protrusion 2201 (e.g., the connecting groove 2301 may have a dovetail shape). The first connecting protrusion 2101 and the second connecting protrusion 2201 may be inserted into the connecting groove 2301 and may contact the inner peripheral surface of the connecting groove 2301. The first connecting protrusion 2101 and the second connecting protrusion 2201 may be configured to firmly maintain the connection relationship between the first body 210, the second body 220 and the deformable portion 230 by contacting the surface of the deformable portion 230.

[0108] In this embodiment, the deformable portion 230 may have stiffness that increases from the center toward the edge. In other words, the deformable portion 230 may have relatively low stiffness at the center, allowing it to deform easily, and relatively high stiffness at the edges, thus limiting deformation. Therefore, the deformable portion 230 can absorb the expansion of the battery cell 110, primarily occurring at the center, and firmly support the edges, thereby improving the structural stability of the battery cell 110.

[0109] Reference Figure 2 and Figure 3 The side panel 300 can be arranged on the side of the battery pack 100. In some embodiments, the side panel 300 can be arranged on the side of the battery pack 100 in a direction substantially perpendicular to the direction in which the battery cells 110 are arranged (e.g., the X-axis direction) (e.g., the Y-axis direction).

[0110] Side plate 300 can be arranged on the side of battery pack 100 to support battery cell 110. Side plate 300 can contact and support battery cell 110, thereby preventing battery cell 110 from shifting.

[0111] Side plates 300 can connect a pair of end plates 200 to each other. In one or more embodiments, opposite ends of side plates 300 can be connected to a pair of end plates 200, and side plates 300 can support the relative positions of the pair of end plates 200.

[0112] In other words, even if the battery cell 110 expands, the side plate 300 can still support the pair of end plates 200 and fix their position. Therefore, the side plate 300 can provide a constraint force to the end plates 200 to support the battery pack 100.

[0113] Figure 7 This is an exploded perspective view of an end plate according to another embodiment of the present disclosure. Figure 8 yes Figure 7 Floor plan. Figure 9 It is shown in detail Figure 7 A view of some components.

[0114] Compared to the end plate 200 according to the currently disclosed embodiment, the end plate 200' according to another disclosed embodiment may have some differences in construction and shape. These redundant parts will be briefly described or omitted, and the differences will be described in detail.

[0115] Reference Figure 7 and Figure 8 According to another disclosed embodiment, the end plate 200' may include a first body 210', a second body 220', and a deformable portion 230'.

[0116] The first body 210' can be arranged to face the battery pack 100' and can support the battery pack 100' in the longitudinal direction (e.g., the X-axis direction) of the battery module 10'. The first body 210' can be arranged between the battery pack 100' and the deformable portion 230' to transmit the force exerted from the battery pack 100' due to the expansion of the battery cell 110' to the deformable portion 230'.

[0117] The first body 210' can contact the surface of the deformable portion 230' to contact and support the deformable portion 230'. The first body 210' can strengthen its connection with the deformable portion 230' by using the first surface 211' to contact and support the deformable portion 230', thereby improving the structural stability of the end plate 200'.

[0118] Reference Figure 7 and Figure 8 The first body 210' may have a connecting protrusion formed to project toward the deformable portion 230'. In some embodiments, the first body 210' may have a first connecting protrusion 2101' that can engage with the deformable portion 230', thereby maximizing (or at least increasing) the contact area with the deformable portion 230'. Thus, the connection between the first body 210' and the deformable portion 230' can be firmly maintained.

[0119] The first connecting protrusion 2101' in the first body 210' can be positioned corresponding to the connecting groove 2311' of the deformable portion 230'. The first connecting protrusion 2101' can be inserted into the connecting groove 2311' to maximize (or at least increase) the contact area between the first body 210' and the deformable portion 230', and to support the relative position of the first body 210' and the deformable portion 230'.

[0120] The first connecting protrusion 2101' can be arranged closer to the edge of the first body 210' than to the center of the first body 210'. Therefore, as described above, the thickness of the deformable portion 230' in the central portion is increased, thereby enabling the deformable portion 230' to absorb the expansion of the battery cell 110'.

[0121] Reference Figure 7 and Figure 8The second body 220' may be spaced apart from the first body 210', and the deformable portion 230' is located between the second body 220' and the first body 210' (e.g., the deformable portion 230' may be sandwiched between the first body 210' and the second body 220'). The second body 220' can compress and deform the deformable portion 230' by applying pressure to it together with the first body 210'. The second body 220' can pressurize the battery cell 110' in a direction opposite to the first body 210' in response to the expansion of the battery cell 110', so that the bulging of the battery cell 110' is absorbed by the deformable portion 230'.

[0122] The second body 220' may include a second connecting protrusion 2201'. For example, the second connecting protrusion 2201' may be on the second surface 221' of the second body 220' facing the deformable portion 230', thereby maximizing (or at least increasing) the contact area between the second body 220' and the deformable portion 230'. Therefore, the connection between the first body 210', the second body 220', and the deformable portion 230' can be strengthened, and the structural stability of the end plate 200' can be improved.

[0123] The deformable portion 230' can be disposed between the first body 210' and the second body 220'. The deformable portion 230' can have stiffness that increases from the center toward the edge. That is, the deformable portion 230' can be disposed between the first body 210' and the second body 220', and can be configured to absorb the expansion of the battery cell 110' in the region near the center, and support the first body 210' and the second body 220' in the region near the edge.

[0124] Reference Figure 7 and Figure 8 The deformable part 230' may include an absorbing member 231' and a supporting member 232'.

[0125] The absorbent member 231' may be connected to a first surface 211' of the first body 210' and a second surface 221' of the second body 220', respectively. In one or more embodiments, the absorbent member 231' may be in contact with the surfaces of the first surface 211' and the second surface 221'. The absorbent member 231' may be compressively deformed in response to pressure from the first surface 211' and the second surface 221'.

[0126] The absorbing member 231' can have a relatively lower rigidity than the supporting member 232', which will be described later. That is, when the absorbing member 231' is pressurized by the first body 210' and the second body 220', the absorbing member 231' can have a larger compressive strain than the supporting member 232'. Therefore, the expansion of the battery cell 110 absorbed by the absorbing member 231' can be greater than the expansion of the battery cell 110 absorbed by the supporting member 232'.

[0127] Reference Figure 7 and Figure 9 The absorption member 231' can be arranged adjacent to the center of the first body 210' and / or the second body 220'. In other words, the absorption member 231' can be arranged at the location where the expansion of the battery cell 110' mainly occurs when bulging or other phenomena occur. Therefore, the expansion of the battery cell 110' can be absorbed by the absorption member 231', thereby ensuring the stability of the battery module 10.

[0128] In an embodiment, the absorption member 231' may cover the electrode assembly 111' of the battery cell 110'. When viewed in the longitudinal direction (e.g., the X-axis direction) of the battery module 10', the electrode assembly 111' housed inside the battery cell 110' may be arranged inside the periphery of the absorption member 231'.

[0129] In other words, the portion of the battery cell 110' that is deformed due to the electrode assembly 111' can be covered by the absorption member 231'. Since the deformed portion of the battery cell 110' is covered by the absorption member 231', which has relatively low rigidity, the expansion of the battery cell 110' can be absorbed by the absorption member 231'. Therefore, even if the battery cell 110' expands due to bulging or the like, the stability of the battery module 10' can be ensured.

[0130] Reference Figures 7 to 9 An absorbent connecting groove 2311' into which the connecting protrusion can be inserted can be formed in the absorbent member 231'. The absorbent connecting groove 2311', corresponding in shape to the first connecting protrusion 2101' and the second connecting protrusion 2201', can be formed in the absorbent member 231' to allow the first connecting protrusion 2101' and the second connecting protrusion 2201' to be inserted therein. The first connecting protrusion 2101' and the second connecting protrusion 2201' can be connected to the first body 210' and the second body 220' by hooking onto the deformable portion 230'.

[0131] Reference Figures 7 to 9The support member 232' may be connected to the outer side (e.g., the upper edge and the outer edge) of the absorber member 231'. In one or more embodiments, the support member 232' may be adjacent to the edges of the first surface 211' and the second surface 221'. That is, the support member 232' may contact and support the portions adjacent to the edges of the first surface 211' and the second surface 221'.

[0132] The support member 232' can have higher rigidity than the absorbing member 231'. When the support member 232' is compressed and deformed by being pressed by the first surface 211' and the second surface 221', the amount of deformation of the support member 232' can be less than the amount of deformation of the absorbing member 231'. Therefore, deformation in the region adjacent to the edge of the end plate 200' can be prevented.

[0133] In an embodiment, the support member 232' may include a first support member 232a' and a second support member 232b'.

[0134] Reference Figures 7 to 9 The first support member 232a' may be arranged adjacent to the battery terminal 110a' of the battery cell 110'. In some embodiments, the first support member 232a' may cover the height direction side (e.g., the upper side) of the battery module 10' along the edge of the first surface 211' or the second surface 221'.

[0135] Therefore, even if the battery cell 110' expands, the deformation of the side of the end plate 200' adjacent to the battery terminal 110a' can be minimized (or at least reduced). In other words, even if expansion occurs, the side of the battery cell 110' adjacent to the battery terminal 110a' can be firmly supported by the end plate 200'. Therefore, canopy cracking due to deformation of the battery cell 110' can be prevented (or at least mitigated).

[0136] In this embodiment, the connecting groove 2311' may not be formed in the first support member 232a'. The first support member 232a' may have a constant (or substantially constant) shape in the width direction (e.g., the Y-axis direction) of the battery module 10'. Therefore, the rigidity of the first support member 232a' can be ensured, and the deformation of the sides of the first body 210' and the second body 220' covered by the first support member 232a' can be minimized (or at least reduced).

[0137] Reference Figure 7 and Figure 9 The second support member 232b' can cover the width direction side of the battery module 10' along the edge of the first surface 211' or the second surface 221'.

[0138] Therefore, even if the battery cell 110' expands, the deformation of the edge side in the width direction of the battery module 10' can be minimized (or at least reduced). In other words, even if bulging or the like occurs, the deformation of the edge side in the width direction of the battery module 10' can be minimized (or at least reduced). In response to the expansion of the battery cell 110', the deformation of the edge of the end plate 200' can be minimized (or at least reduced), thereby ensuring the structural stability of the battery module 10'.

[0139] Reference Figure 7 and Figure 9 The second support member 232b' can be configured as a pair. The pair of second support members 232b' can cover the opposite width direction side (e.g., opposite sides in the Y-axis direction) of the battery module 10' along the edge of the first surface 211' or the second surface 221'.

[0140] Because the second support members 232b' are configured as a pair, the end plate 200' can deform symmetrically (or substantially symmetrically) in the width direction of the battery module 10'. Therefore, the durability of the end plate 200' can be improved.

[0141] In an embodiment, the support connection groove 2321b' may be formed in the second support member 232b'. That is, the second support member 232b' can be connected to the first body 210' or the second body 220' by engaging with the connection protrusions 2101' and 2201'.

[0142] Because the second support member 232b' has a relatively higher rigidity than the absorbing member 231', the second support member 232b' can firmly support the connecting protrusions 2101' and 2201' inserted into the inner side of the support connecting groove 2321b'. Therefore, the engagement relationship between the first body 210', the second body 220', and the deformable part 230' can be firmly maintained.

[0143] The operating principle and effects of the battery module 10 according to the disclosed embodiments will be described.

[0144] Reference Figures 1 to 5 According to embodiments of the present disclosure, the end plate 200 can support the battery pack 100 in the length direction (e.g., the X-axis direction) of the battery module 10. In some embodiments, the end plates 200 can be configured as a pair to support the battery pack 100 in opposite directions (e.g., opposite ends of the battery pack 100 in the X-axis direction), thereby improving the stability of the battery module 10.

[0145] End plates 200 (or a pair of end plates 200) can be arranged on one side (or multiple sides) of the battery pack 100 to support the battery pack 100 in the direction in which the battery pack 100 is arranged. Therefore, when the battery cell 110 expands due to bulging or the like, the end plates 200 (or a pair of end plates 200) can support the battery cell 110 and absorb the expansion.

[0146] Reference Figures 4 to 6 The first body 210 can be disposed between the outermost battery cell 110 and the deformable portion 230 in the battery cell 110. The first body 210 can contact the outermost battery cell 110 through a surface, and contact the deformable portion 230 through a first surface 211 opposite to the surface contacting the outermost battery cell 110. Therefore, the first body 210 can transmit the force transmitted by the expansion of one of the battery cells 110 to the deformable portion 230.

[0147] Reference Figures 4 to 6 The first body 210 may include a first connecting protrusion 2101. In some embodiments, the first body 210 may include a first connecting protrusion 2101 protruding on a first surface 211 facing the deformable portion 230.

[0148] The first connecting protrusion 2101 can engage with the deformable portion 230. For example, the first connecting protrusion 2101 can be inserted into the connecting groove 2301 in the deformable portion 230 and thus engage with the deformable portion 230.

[0149] Because the first connecting protrusion 2101 contacts the deformable portion 230, the contact area between the first body 210 and the deformable portion 230 can be maximized (or at least increased). Therefore, the bonding relationship between the first body 210 and the deformable portion 230 can be strengthened.

[0150] The first connecting protrusion 2101 can be arranged closer to the edge than to the center of the first surface 211. For example, the first connecting protrusion 2101 can be arranged in the connecting region A, which is closer to the edge than to the center of the first surface 211.

[0151] Because the first connecting protrusion 2101 is arranged in the connecting region A, the thickness of the deformable portion 230 located at the center of the first surface 211 or the second surface 221 can be relatively thicker than the thickness of the deformable portion 230 at the edge. Therefore, in the case of expansion of the battery cell 110, the amount of expansion of the battery cell 110 absorbed by the deformable portion 230 can be maximized (or at least increased).

[0152] Reference Figure 4 and Figure 5The second body 220 may be spaced apart from the first body 210, and the deformable portion 230 is located between the second body 220 and the first body 210 (e.g., the deformable portion 230 may be sandwiched between the first body 210 and the second body 220). The second body 220 may be configured to compress and deform the deformable portion 230 by applying pressure together with the first body 210 when the battery cell 110 expands. In other words, the second body 220 may, together with the first body 210, allow the expansion of the battery cell 110 to be absorbed by the deformable portion 230.

[0153] Reference Figure 4 and Figure 5 The deformable portion 230 can be arranged between the first body 210 and the second body 220. The deformable portion 230 can have a relatively lower stiffness than the first body 210 or the second body 220, so that the deformable portion 230 can compress and deform when the battery cell 110 expands. Therefore, the deformable portion 230 can absorb the expansion of the battery cell 110 and improve the structural stability of the battery module 10.

[0154] The connecting groove 2301 can be formed in the deformable portion 230 at a position corresponding to the connecting protrusion. For example, the connecting groove 2301 can be arranged closer to the edge than to the center of the deformable portion 230. That is, because the thickness of the central portion of the deformable portion 230 is maintained (e.g., not reduced due to the presence of the connecting groove 2301), the amount of expansion of the battery cell 110 absorbed by the deformable portion 230 can be maximized (or at least increased).

[0155] Reference Figure 2 and Figure 3 The side plate 300 can be arranged on the side of the battery pack 100. The side plate 300 can support the side of the battery pack 100 and connect a pair of end plates 200 to each other.

[0156] Reference Figures 7 to 9 According to another embodiment of the present disclosure, the deformable portion 230' may include an absorbing member 231' and a supporting member 232'.

[0157] The absorption member 231' can be arranged to contact the central portion of the first surface 211' and the second surface 221'. The absorption member 231' can contact the first surface 211' and the second surface 221' and absorb the expansion of the battery cell 110'. Therefore, the stability of the battery module 10' can be achieved.

[0158] The support member 232' can be arranged on one (or more) outer sides of the absorption member 231'. The support member 232' can have higher rigidity than the absorption member 231', thereby minimizing (or at least reducing) deformation on one side of the edge of the end plate 200' in the event of expansion of the battery cell 110'. Therefore, the durability of the battery module 10' can be improved.

[0159] In an embodiment, the deformable portion 230' may include a first support member 232a' and a second support member 232b'.

[0160] The first support member 232a' can be arranged adjacent to the battery terminal 110a'. That is, even if the battery cell 110' expands, the first support member 232a' can support the side of the end plate 200' near the battery terminal 110a' to prevent (or at least reduce) deformation of the side of the end plate 200'. Therefore, even if the battery cell 110' expands, it can prevent (or at least reduce) the can cap cracking, thereby improving the durability of the battery module 10'.

[0161] The second support member 232b' can be arranged on the width side of the battery module 10'. That is, even if the battery cell 110' expands, the second support member 232b' can support the side edge of the end plate 200' to prevent (or at least reduce) the side deformation of the edge of the end plate 200'. Therefore, the second support member 232b' together with the first support member 232a' can improve the durability of the battery module 10'.

[0162] According to the disclosed embodiments, the battery module and the battery pack including the battery module can use a stacked structure in which the end plates, the first body, the second body and the deformable portion are arranged in one direction to absorb the expansion of the battery cells.

[0163] In addition, the durability of the end plate can be improved by using connecting protrusions formed as protrusions on at least one of the first or second bodies to firmly support the deformable portion.

[0164] In addition, the structural stability of the battery module can be improved by specifying the location of the connecting protrusions formed on the first or second body to maximize (or at least increase) the amount of expansion of the battery cells absorbed by the deformable portion.

[0165] However, the effects that can be obtained through disclosure are not limited to those described above, and those skilled in the art can clearly understand other technical effects not mentioned from the above description of the disclosure.

[0166] Although the disclosure has been described with reference to limited embodiments and drawings, the disclosure is not limited thereto, and various modifications and changes can be made by those skilled in the art within the spirit of the disclosure and the equivalents of the claims set forth above.

Claims

1. A battery module, the battery module comprising: A battery pack includes multiple battery cells arranged in one direction; and End plate, including: A first body is located on one side of the battery pack in the said direction and is arranged to face the battery pack; The second entity is spaced apart from the first entity; and The deformable portion, located between the first body and the second body, is compressible and deformable. Wherein, at least one of the first body and the second body includes a connecting protrusion that protrudes toward the deformable portion and is configured to engage with the deformable portion.

2. The battery module according to claim 1, wherein, The connecting protrusion is relatively closer to the edge of the first or second body than to the center of the first or second body.

3. The battery module according to claim 1, wherein, The connecting protrusion is on at least one of the first surface of the first body facing the second body and the second surface of the second body facing the first body.

4. The battery module according to claim 1, wherein, The stiffness of the deformable portion increases from the center of the deformable portion toward the edge of the deformable portion.

5. The battery module according to claim 1, wherein, The deformable portion includes: The absorbent member is in contact with the surfaces of the first body and the second body; and A support member is connected to the outside of the absorbent member, and the support member has a higher stiffness than the absorbent member.

6. The battery module according to claim 5, wherein, When viewed from the aforementioned direction, the electrode assembly housed within each of the plurality of battery cells is located inside the outer periphery of the absorption member.

7. The battery module according to claim 5, wherein, The support member is adjacent to the battery terminal of one of the plurality of battery cells.

8. The battery module according to claim 1, wherein, The connecting protrusion has a shape in which the width increases outward.

9. The battery module according to claim 1, wherein, The connecting protrusion extends in the height direction of the plurality of battery cells.

10. The battery module according to claim 1, further comprising a connection groove in the deformable portion, the connection groove having a predetermined depth and configured to accommodate the connection protrusion.

11. A battery pack, the battery pack comprising: Multiple battery modules; and The battery pack housing contains the plurality of battery modules. Each of the plurality of battery modules includes: A battery pack, comprising multiple battery cells arranged in one direction; and An end plate includes a first body located on one side of the battery pack and facing the battery pack in the said one direction, a second body spaced apart from the first body, and a deformable portion between the first body and the second body, the deformable portion being compressible and deformable. At least one of the first body and the second body includes a connecting protrusion protruding toward the deformable portion, the connecting protrusion being configured to engage the deformable portion.

12. The battery pack according to claim 11, wherein, The connecting protrusion is arranged relatively closer to the edge of the first or second body than to the center of the first or second body.

13. The battery pack according to claim 11, wherein, The connecting protrusion is located on at least one of the first surface of the first body facing the second body and the second surface of the second body facing the first body.

14. The battery pack according to claim 11, wherein, The stiffness of the deformable portion increases from the center of the deformable portion toward the edge of the deformable portion.

15. The battery pack according to claim 11, wherein, The deformable portion includes: The absorbent member is in contact with the surfaces of the first body and the second body; and A support member is connected to the outside of the absorbent member, and the support member has a higher stiffness than the absorbent member.

16. The battery pack according to claim 15, wherein, When viewed from the aforementioned direction, the electrode assembly housed within each of the plurality of battery cells is located inside the outer periphery of the absorption member.

17. The battery pack according to claim 15, wherein, The support member is adjacent to the battery terminal of one of the plurality of battery cells.

18. The battery pack according to claim 11, wherein, The connecting protrusion has a shape in which the width increases outward.

19. The battery pack according to claim 11, wherein, The connecting protrusion extends in the height direction of the plurality of battery cells.

20. The battery pack of claim 11, further comprising a connection groove in the deformable portion, the connection groove being configured to receive the connection protrusion.

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