Battery pack comprising thermal resin

Abstract

Provided is a structure of a battery pack, the battery pack comprising: a battery module provided with a module frame; a pack frame provided with a bottom plate on which the battery module is mounted; and a thermal resin interposed between a bottom plate of the battery module and the bottom plate of the pack frame, wherein hole- or recess-shaped receiving portions are provided in a bottom plate of the module frame, and the thermal resin has extending portions extending upward so as to be filled in anchor portions.

Description

Battery pack having thermally conductive resin

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0026080, dated February 22, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the structure of a battery pack comprising a thermally conductive resin. More specifically, the present invention relates to the structure of a battery pack having improved bonding strength and thermal conductivity between a thermally conductive resin provided between a battery module and a pack frame and a module frame.

[0003] Secondary batteries, which boast high electrical properties such as high energy density and easy applicability across a wide range of product groups, are widely used not only in portable devices but also in electric or hybrid vehicles powered by electrical power sources, as well as in power storage devices. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0004] While small mobile devices typically use one or two or three battery cells per device, medium- to large-sized devices, such as automobiles, require high output and large capacity. Therefore, medium- to large-sized battery modules, which electrically connect multiple battery cells, are used. Furthermore, these battery modules can be integrated into battery packs to achieve even higher output and capacity.

[0005] Figure 1 illustrates a battery pack. Referring to this, the battery pack (P) is configured to include a plurality of battery modules (M) and a pack frame (PF) that accommodates the battery modules. The battery modules (M) are electrically connected to each other to form a single high-capacity, high-voltage battery.

[0006] Figures 2 and 3 illustrate a battery module mounted on a pack frame together with a thermally conductive resin, and Figure 4 illustrates a cross-section of the battery pack of Figure 2. Referring to these drawings, a thermally conductive resin (3) is interposed between the battery module (M) and the pack frame (PF).

[0007] Secondary batteries generate heat during charging and discharging, and temperature changes, especially high-temperature heat, significantly reduce battery efficiency. The thermally conductive resin (3) conducts the heat from the battery module (M) to the pack frame (PF) to dissipate the heat. However, as batteries become increasingly high-capacity and high-voltage, their heat generation also increases. However, the poor heat dissipation efficiency of this heat dissipation structure utilizing the thermally conductive resin is problematic.

[0008] Meanwhile, the thermally conductive resin (3) also serves to adhesively fix the battery module (M) and the pack frame (PF). However, since this type of fixation relies solely on the adhesive strength between the module frame (20) and the pack frame (PF) and the thermally conductive resin (3), it is very vulnerable to loads that cause slippage.

[0009] The present invention was created under the background of the above-described prior art, and its purpose is to provide a structure of a battery pack in which heat generated from a battery module can be dissipated to the outside through a pack frame.

[0010] In addition, the present invention seeks to provide a structure of a battery pack in which the bonding force between the thermally conductive resin and the module frame is strengthened, so that the mechanical fixation between the module frame and the thermally conductive resin and / or the thermal connection between the battery module and the pack frame can be firmly maintained.

[0011] Specifically, the present invention seeks to provide a structure of a battery pack in which horizontal and / or vertical detachment of a thermally conductive resin from a module frame is prevented.

[0012] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0013] In order to solve the above problem, the present invention provides a battery pack structure including: a battery module having a module frame; a pack frame having a bottom plate on which the battery module is mounted; and a thermally conductive resin interposed between the bottom plate of the battery module and the bottom plate of the pack frame; wherein a hole-shaped anchor portion is provided in the bottom plate of the module frame, and the thermally conductive resin has an extension portion that extends upward and fills the anchor portion.

[0014] According to the present invention, by interfering with the anchor portion in the horizontal direction, the thermally conductive resin can resist a shear load occurring between the bottom plate of the module frame and the thermally conductive resin, and the thermally conductive resin can be prevented from horizontally detaching from the module frame.

[0015] In addition, according to the present invention, since the contact area between the thermally conductive resin and the module frame increases, the speed at which heat is conducted from the thermally conductive resin to the pack frame increases.

[0016] Preferably, the anchor portions may be arranged in a grid of three or more rows and three or more columns. Furthermore, the rows and columns of the anchor portions may be arranged at equal intervals. Accordingly, each anchor portion may evenly distribute shear stress, and heat may be evenly dissipated through the thermally conductive resin.

[0017] The anchor portion may include a first portion having a predetermined first internal width along a horizontal direction, and a second portion having a predetermined second internal width greater than the first internal width along the horizontal direction and positioned above the first portion. In other words, the anchor portion may include the first portion and a second portion positioned above the first portion, and the cross-sectional shape of the first portion may not completely include the cross-sectional shape of the second portion in a plan view. Accordingly, the extension portion may interfere from below between the first portion and the second portion, and the thermally conductive resin may be prevented from falling off downward from the module frame.

[0018] For example, the anchor portion may include a first portion having a circular cross-section of a predetermined first inner diameter, and a second portion having a circular cross-section of a predetermined second inner diameter larger than the first inner diameter and positioned above the first portion.

[0019] According to a first embodiment of the present invention, the first part may have a rectangular cross-section extending along one horizontal direction with a predetermined width and length, and the second part may have a rectangular cross-section extending along another horizontal direction intersecting the one horizontal direction with the predetermined width and length.

[0020] The above anchor portion may include a tapered portion whose cross-sectional area becomes narrower as it goes downward. The tapered portion may prevent the thermally conductive resin from falling downward from the module frame by interfering with the extension portion from below.

[0021] For example, the anchor portion may include a tapered portion having a circular cross-section whose inner diameter becomes smaller as it goes downward.

[0022] According to a second embodiment of the present invention, the anchor portion may include a tapered portion having an inner circumferential surface in the shape of a truncated cone whose inner diameter becomes smaller as it goes downward.

[0023] The thermally conductive resin may include: an upper resin layer connected to the upper portion of the bottom plate of the module frame; and a lower resin layer connected to the lower portion of the bottom plate of the module frame. At this time, the extension portion may connect the upper resin layer and the lower resin layer via the anchor portion. The upper resin layer may interfere with the bottom plate of the module frame from below, thereby preventing the entire thermally conductive resin from falling off downward from the bottom plate of the module frame. In addition, in this case, the thermally conductive resin may connect the upper and lower portions of the bottom plate of the module frame, thereby more effectively dissipating heat generated from a battery cell mounted on the module frame to the outside of the module frame.

[0024] The present invention also provides a battery pack structure comprising: a battery module having a module frame; a pack frame having a bottom plate on which the battery module is mounted; and a thermally conductive resin interposed between the bottom plate of the battery module and the bottom plate of the pack frame; wherein the bottom plate of the battery module has an anchor portion in the shape of a groove sunken upward, and the thermally conductive resin has an extension portion that extends upward and fills the anchor portion.

[0025] According to the present invention, by interfering with the anchor portion in the horizontal direction, the thermally conductive resin can resist a shear load occurring between the bottom plate of the module frame and the thermally conductive resin, and the thermally conductive resin can be prevented from horizontally detaching from the module frame.

[0026] In addition, according to the present invention, since the contact area between the thermally conductive resin and the module frame increases, the speed at which heat is conducted from the thermally conductive resin to the pack frame increases.

[0027] Preferably, the anchor portions may be arranged in multiple rows that extend parallel to each other and are arranged in parallel. Furthermore, the multiple rows of anchor portions may be arranged at equal intervals. Accordingly, each anchor portion can evenly distribute shear stress, and heat dissipation through the thermally conductive resin can occur evenly.

[0028] The anchor portion may include a first portion having a predetermined first internal width along a horizontal direction, and a second portion having a predetermined second internal width greater than the first internal width along the horizontal direction and positioned above the first portion. In other words, the anchor portion may include the first portion and a second portion positioned above the first portion, and the cross-sectional shape of the first portion may not completely include the cross-sectional shape of the second portion in a plan view. Accordingly, the extension portion may interfere from below between the first portion and the second portion, and the thermally conductive resin may be prevented from falling off downward from the floor plate.

[0029] For example, the anchor portion may include a first portion having a rectangular cross-section extending along a longitudinal direction to a predetermined first inner width, and a second portion having a rectangular cross-section extending along a longitudinal direction to a predetermined second inner width greater than the first inner width, and positioned lower than the first portion.

[0030] Alternatively, the anchor portion may include a tapered portion whose cross-sectional area becomes narrower as it goes downward. The tapered portion may prevent the thermally conductive resin from falling upward from the bottom plate of the module frame by interfering with the extension portion from below.

[0031] For example, the anchor portion may include a tapered portion having a rectangular cross-section whose inner width becomes smaller as it goes downward.

[0032] According to a third embodiment of the present invention, the anchor portion may include a tapered portion extending in the longitudinal direction and having a trapezoidal cross-section with an upper width greater than a lower width in the longitudinal direction.

[0033] The present invention also provides a structure of a vehicle including the battery pack. The battery pack may be installed in the vehicle as a power source. The vehicle may be an electric vehicle or a hybrid vehicle. The vehicle may be a two-wheeled vehicle or a four-wheeled vehicle. However, the structure of the vehicle is not limited to the above, and the battery pack need not necessarily serve as the vehicle's power source.

[0034] The present invention can provide a structure of a battery pack in which heat generated from a battery module can be dissipated to the outside of the pack frame by thermally connecting the battery module and the pack frame by a thermally conductive resin.

[0035] In addition, the present invention can provide a structure of a battery pack in which the bonding force between the thermally conductive resin and the module frame is strengthened, so that the mechanical fixation between the module frame and the thermally conductive resin and the thermal connection between the battery module and the pack frame can be firmly maintained.

[0036] Specifically, the present invention can provide a structure of a battery pack in which horizontal detachment of a thermally conductive resin from a module frame is prevented due to interference between a downward extension of the thermally conductive resin and an anchor portion, and a structure of a battery pack in which vertical detachment of the thermally conductive resin from the module frame is prevented due to a cross-sectional shape of the anchor portion.

[0037] In addition, the present invention may have various other effects, which will be described in each embodiment, or the description of effects that can be easily inferred by a person skilled in the art will be omitted.

[0038] Figure 1 shows a battery pack.

[0039] Figures 2 and 3 show a battery module mounted on a pack frame together with a thermally conductive resin.

[0040] Figure 4 shows a cross-section of the battery pack of Figure 2.

[0041] Figure 5 illustrates a battery pack according to one embodiment of the present invention.

[0042] Figure 6 shows a battery module mounted on a pack frame according to one embodiment of the present invention.

[0043] Figure 7 shows a battery module according to a first embodiment of the present invention mounted on a pack frame together with a thermally conductive resin.

[0044] Figures 8 and 9 show a module frame and a thermally conductive resin layer according to a first embodiment of the present invention.

[0045] Figures 10 and 11 show a cross-section and its main parts of a battery pack according to a first embodiment of the present invention.

[0046] Figure 12 shows a battery module according to a second embodiment of the present invention mounted on a pack frame together with a thermally conductive resin.

[0047] Figures 13 and 14 show a module frame and a thermally conductive resin layer according to a second embodiment of the present invention.

[0048] Figures 15 and 16 show a cross-section and its main parts of a battery pack according to a second embodiment of the present invention.

[0049] Figure 17 shows a battery module according to a third embodiment of the present invention mounted on a pack frame together with a thermally conductive resin.

[0050] Figures 18 and 19 show a module frame and a thermally conductive resin layer according to a third embodiment of the present invention.

[0051] Figures 20 and 21 show a cross-section and its main parts of a battery pack according to a third embodiment of the present invention.

[0052] Figure 22 illustrates a vehicle according to one embodiment of the present invention.

[0053] [Explanation of symbols]

[0054] 1: Battery cell

[0055] 2: Module Frame

[0056] 20: Floor plate

[0057] 200: Anchor section

[0058] 201: Part 1

[0059] 202: Part 2

[0060] 203: Tapered section

[0061] 3: Thermally conductive resin

[0062] 30: Extension

[0063] 31: Upper resin layer

[0064] 32: Low resin layer

[0065] M: Battery module

[0066] P: Battery pack

[0067] PF: Pack Frame

[0068] V: Car

[0069] D1: First inner width (first inner diameter)

[0070] D2: First inner width (first inner diameter)

[0071] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0072] Although the terms "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0073] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0074] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0075] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0076] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0077] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C to D", this means C or more and D or less, unless otherwise stated.

[0078]

[0079] The present invention relates to a battery pack having a battery module and a pack frame accommodating the same, wherein the battery pack comprises a thermally conductive resin that mechanically and thermally connects the battery module and the pack frame, the thermally conductive resin is prevented from falling off from the module frame, and the battery pack structure is in contact with the module frame over a large area.

[0080] Hereinafter, a preferred embodiment of the present invention will be described with reference to the attached drawings.

[0081]

[0082] [Overall structure of the battery pack]

[0083] Hereinafter, with reference to FIGS. 5 and 6, the overall structure of a battery pack according to one embodiment of the present invention will be described.

[0084] Fig. 5 illustrates a battery pack according to one embodiment of the present invention. Referring to this, a battery pack (P) according to one embodiment of the present invention may include a plurality of battery modules (M) and a pack frame (PF) on which they are mounted.

[0085] The battery module may have a module frame constituting its exterior. The module frame may include a material having high thermal conductivity and strength, such as metal. For example, the module frame according to one embodiment of the present invention may have a box shape manufactured by bending and / or welding an aluminum plate. However, the module frame only needs to have a flat bottom surface that can be placed on the bottom plate of the pack frame (PF), and its shape and material are not particularly limited.

[0086] The battery module (M) according to one embodiment of the present invention may include a plurality of battery cells built into the module frame, but is not limited to this structure and may be a unit secondary battery of various shapes and structures.

[0087] Each of the above battery modules (M) may have a pair of positive and negative terminals exposed to the outside of the module frame. The terminals of the battery modules (M) may be electrically connected in parallel and / or in series with each other. To this end, the battery pack may have a conductive bus bar connected to the terminals. Accordingly, the battery pack may be configured with a high voltage and / or a high capacity.

[0088] The pack frame (PF) according to one embodiment of the present invention may include a material having high thermal conductivity and strength, such as metal. For example, the pack frame (PF) according to one embodiment of the present invention may have a box shape manufactured by bending and / or welding an aluminum plate. However, the pack frame (PF) only needs to have a flat bottom surface on which the battery module (M) can be placed, and its shape and material are not specifically limited.

[0089] The above battery module (M), specifically, one or more battery cells built into the battery module (M), can release heat during charging / discharging or when thermal runaway occurs due to a short circuit, etc. The battery pack can be configured so that such heat is conducted to the pack frame (PF) through the module frame and dissipated to the outside.

[0090] Fig. 6 illustrates a battery module mounted on a pack frame according to one embodiment of the present invention. Referring to this, the battery pack (P) may include a thermally conductive resin (3) interposed between the frame of the battery module (M) and the pack frame (PF). Specifically, the thermally conductive resin (3) may be interposed between the bottom surface of the module frame (2) and the bottom surface of the pack frame (PF).

[0091] The thermally conductive resin (3) may include a synthetic resin having high thermal conductivity. In addition, the battery module (M) and the pack frame (PF) may be adhesively fixed to each other by the thermally conductive resin (3) applied to the bottom surface of the pack frame (PF) being cured after the battery module (M) is placed. Accordingly, the thermally conductive resin (3) may structurally and thermally connect the battery module (M) and the pack frame (PF).

[0092]

[0093] [First embodiment]

[0094] Hereinafter, with reference to FIGS. 7 to 11, the shape and bonding structure of the module frame and thermally conductive resin according to the first embodiment of the present invention will be described in detail.

[0095] Fig. 7 illustrates a battery module according to a first embodiment of the present invention mounted on a pack frame together with a thermally conductive resin, and Figs. 8 and 9 illustrate a module frame and a thermally conductive resin layer according to the first embodiment of the present invention. Referring to these drawings, the module frame (2) may include a bottom plate (20) connected to the thermally conductive resin (3).

[0096] The above floor plate (20) may be provided with an anchor portion (200) in the shape of a hole extending upward from its bottom surface.

[0097] When the above battery module (M) is placed on the thermally conductive resin (3) before curing, the thermally conductive resin (3) can be cured after flowing into the anchor portion (200), thereby forming an extension portion (30) in the shape of a protrusion that protrudes upward.

[0098] At this time, since the anchor part (200) and the extension part (30) overlap each other horizontally, the thermally conductive resin (3) and the module frame (2) can be horizontally shear-connected to each other. That is, the horizontal interference between the anchor part (200) and the extension part (30) can limit the movement of the module frame (2) with respect to the thermally conductive resin (3), and the module frame (2) and the thermally conductive resin (3) can be structurally and mechanically fixed to each other as well as by adhesive force. Accordingly, the battery module (M) can be more firmly fixed to the bottom surface of the thermally conductive resin (3) and the pack frame (PF) on which the thermally conductive resin (3) is applied.

[0099] In addition, at this time, as the anchor part (200) and the extension part (30) are in horizontal contact with each other, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. That is, compared to a case where the bottom surface of the module frame (2) is formed flat, the bottom surface of the module frame (2) having the anchor part (200) has a large surface area, and as a part of the thermally conductive resin (3) flows into the anchor part (200) and is cured, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. Accordingly, the area through which heat can be conducted from the module frame (2) to the thermally conductive resin (3) increases, so that the heat of the battery module (M) can be conducted to the thermally conductive resin (3) and the pack frame (PF) more quickly and be dissipated.

[0100] It is preferable that the above anchor portion (200) be provided in multiple units. Accordingly, the above extension portion (30) can also be formed in multiple units, and the multiple extension portions (30) can share the shear stress from the module frame (2).

[0101] For example, the anchor portion (200) may be arranged in a grid of three rows and three columns or more. At this time, it is preferable that the rows and columns of the anchor portion (200) are arranged at equal intervals. Accordingly, the anchor portion (200) and the extension portion (30) can each evenly distribute stress, and the heat generated in the battery module (M) can be evenly dissipated to all areas.

[0102] Figures 10 and 11 illustrate a cross-section and a main part of a battery pack according to a first embodiment of the present invention. Referring to these drawings, the anchor portion (200) may include a first portion (201) having a predetermined first inner width (D1) along a horizontal direction, and a second portion (202) having a predetermined second inner width (D2) greater than the first inner width (D1) along the horizontal direction and positioned above the first portion (201).

[0103] In other words, the anchor portion (200) may include a first portion (201) and a second portion (202) positioned above the first portion (201), and the cross-sectional shape of the first portion (201) may not completely include the cross-sectional shape of the second portion (202) in a plan view. Accordingly, the extension portion (30) may interfere from below between the first portion (201) and the second portion (202), and the thermally conductive resin (3) may be prevented from falling off downward from the module frame.

[0104] According to the present embodiment, the first part (201) may have a rectangular cross-section extending along one horizontal direction with a predetermined width and length, and the second part (202) may have a rectangular cross-section extending along another horizontal direction intersecting the one horizontal direction with the predetermined width and length.

[0105] In one variation, the anchor portion (200) may include a first portion (201) having a circular cross-section of a predetermined first inner diameter, and a second portion (202) having a circular cross-section of a predetermined second inner diameter larger than the first inner diameter and positioned above the first portion (201).

[0106]

[0107] [Second Embodiment]

[0108] Hereinafter, with reference to FIGS. 12 to 16, the shape and bonding structure of the module frame and thermally conductive resin according to the second embodiment of the present invention will be described in detail.

[0109] Fig. 12 illustrates a battery module according to a second embodiment of the present invention mounted on a pack frame together with a thermally conductive resin, and Figs. 13 and 14 illustrate a module frame and a thermally conductive resin layer according to the second embodiment of the present invention. Referring to these drawings, the module frame (2) may include a bottom plate (20) connected to the thermally conductive resin (3).

[0110] The above floor plate (20) may be provided with an anchor portion (200) in the shape of a hole extending upward from its bottom surface.

[0111] When the above battery module (M) is placed on the thermally conductive resin (3) before curing, the thermally conductive resin (3) can be cured after flowing into the anchor portion (200), thereby forming an extension portion (30) in the shape of a protrusion that protrudes upward.

[0112] At this time, since the anchor part (200) and the extension part (30) overlap each other horizontally, the thermally conductive resin (3) and the module frame (2) can be horizontally shear-connected to each other. That is, the horizontal interference between the anchor part (200) and the extension part (30) can limit the movement of the module frame (2) with respect to the thermally conductive resin (3), and the module frame (2) and the thermally conductive resin (3) can be structurally and mechanically fixed to each other as well as by adhesive force. Accordingly, the battery module (M) can be more firmly fixed to the bottom surface of the thermally conductive resin (3) and the pack frame (PF) on which the thermally conductive resin (3) is applied.

[0113] In addition, at this time, as the anchor part (200) and the extension part (30) are in horizontal contact with each other, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. That is, compared to a case where the bottom surface of the module frame (2) is formed flat, the bottom surface of the module frame (2) having the anchor part (200) has a large surface area, and as a part of the thermally conductive resin (3) flows into the anchor part (200) and is cured, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. Accordingly, the area through which heat can be conducted from the module frame (2) to the thermally conductive resin (3) increases, so that the heat of the battery module (M) can be conducted to the thermally conductive resin (3) and the pack frame (PF) more quickly and be dissipated.

[0114] It is preferable that the above anchor portion (200) be provided in multiple units. Accordingly, the above extension portion (30) can also be formed in multiple units, and the multiple extension portions (30) can share the shear stress from the module frame (2).

[0115] For example, the anchor portion (200) may be arranged in a grid of three rows and three columns or more. At this time, it is preferable that the rows and columns of the anchor portion (200) are arranged at equal intervals. Accordingly, the anchor portion (200) and the extension portion (30) can each evenly distribute stress, and the heat generated in the battery module (M) can be evenly dissipated to all areas.

[0116] Figures 15 and 16 illustrate a cross-section and its main parts of a battery pack according to a second embodiment of the present invention. Referring to these drawings, the anchor portion (200) may include a tapered portion (203) whose cross-sectional area becomes narrower as it goes downward. The tapered portion (203) may prevent the thermally conductive resin (3) from falling off downward from the module frame (2) by interfering with the extension portion from below.

[0117] According to one aspect of the present embodiment, the anchor portion (200) may include a tapered portion (203) having an inner circumferential surface in the shape of a truncated cone whose inner diameter (D1, D2) becomes smaller as it goes downward.

[0118] In one variation, the anchor portion (200) may include a tapered portion (203) having a circular cross-section whose inner diameter becomes smaller as it goes downward.

[0119] According to another aspect of the present embodiment, the thermally conductive resin (3) may include: an upper resin layer (31) connected to the upper portion of the bottom plate (20) of the module frame (2); and a lower resin layer (32) connected to the lower portion of the bottom plate (20) of the module frame (2). At this time, the extension portion may connect the upper resin layer (31) and the lower resin layer (32) via the anchor portion (200).

[0120] The upper resin layer (31) can prevent the entire thermally conductive resin (3) from falling off downward from the bottom plate (20) of the module frame (2) by interfering with the bottom plate (20) of the module frame (2) from below.

[0121] In addition, in this case, the thermally conductive resin (3) can more effectively dissipate heat generated from the battery cell (1) mounted on the module frame (2) to the outside of the module frame (2) by connecting the upper and lower portions of the bottom plate (20) of the module frame (2). That is, at this time, the thermally conductive resin (3) can very effectively absorb heat generated from the battery module (M) and release it to the pack frame (PF) by simultaneously contacting the bottom surface of the bottom plate (20), the upper surface of the bottom plate (20), and the bottom surface of the battery cell (1) mounted on the bottom plate (20).

[0122]

[0123] [Third Embodiment]

[0124] Hereinafter, with reference to FIGS. 17 to 21, the shape and bonding structure of the module frame and thermally conductive resin according to the third embodiment of the present invention will be described in detail.

[0125] Fig. 17 illustrates a battery module according to a third embodiment of the present invention mounted on a pack frame together with a thermally conductive resin, and Figs. 18 and 19 illustrate a module frame and a thermally conductive resin layer according to a third embodiment of the present invention. Referring to these drawings, the module frame (2) may include a bottom plate (20) connected to the thermally conductive resin (3).

[0126] The above floor plate (20) may be provided with an anchor portion (200) in the shape of a groove extending upward from its bottom surface.

[0127] When the above battery module (M) is placed on the thermally conductive resin (3) before curing, the thermally conductive resin (3) can be cured after flowing into the anchor portion (200), thereby forming an extension portion (30) in the shape of a protrusion that protrudes upward.

[0128] At this time, since the anchor part (200) and the extension part (30) overlap each other horizontally, the thermally conductive resin (3) and the module frame (2) can be horizontally shear-connected to each other. That is, the horizontal interference between the anchor part (200) and the extension part (30) can limit the movement of the module frame (2) with respect to the thermally conductive resin (3), and the module frame (2) and the thermally conductive resin (3) can be structurally and mechanically fixed to each other as well as by adhesive force. Accordingly, the battery module (M) can be more firmly fixed to the bottom surface of the thermally conductive resin (3) and the pack frame (PF) on which the thermally conductive resin (3) is applied.

[0129] In addition, at this time, as the anchor part (200) and the extension part (30) are in horizontal contact with each other, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. That is, compared to a case where the bottom surface of the module frame (2) is formed flat, the bottom surface of the module frame (2) having the anchor part (200) has a large surface area, and as a part of the thermally conductive resin (3) flows into the anchor part (200) and is cured, the contact area between the module frame (2) and the thermally conductive resin (3) can increase. Accordingly, the area through which heat can be conducted from the module frame (2) to the thermally conductive resin (3) increases, so that the heat of the battery module (M) can be conducted to the thermally conductive resin (3) and the pack frame (PF) more quickly and be dissipated.

[0130] It is preferable that the above anchor portion (200) be provided in multiple units. Accordingly, the above extension portion (30) can also be formed in multiple units, and the multiple extension portions (30) can share the shear stress from the module frame (2).

[0131] For example, the anchor portions (200) may be arranged in multiple rows that extend parallel to each other and are juxtaposed. At this time, the multiple rows of the anchor portions (200) may be arranged at equal intervals. Accordingly, each of the anchor portions (200) may evenly distribute shear stress, and heat dissipation through the thermally conductive resin (3) may occur evenly.

[0132] Figures 20 and 21 illustrate a cross-section and a main part of a battery pack according to a third embodiment of the present invention. Referring to these, the anchor portion (200) may include a tapered portion (203) whose cross-sectional area becomes narrower as it goes downward. The tapered portion (203) may prevent the thermally conductive resin (3) from falling upward from the bottom plate (20) of the module frame (2) by interfering with the extension portion (30) from below.

[0133] According to the present embodiment, the anchor portion (200) may include a tapered portion (203) having a rectangular cross-section whose inner width (D1, D2) becomes smaller as it goes downward. More specifically, the anchor portion (200) may include a tapered portion (203) having a trapezoidal cross-section that extends in the longitudinal direction and whose upper width in the longitudinal direction is larger than its lower width.

[0134] In one variation, the anchor portion (200) may include a first portion having a predetermined first inner width along a horizontal direction, and a second portion having a predetermined second inner width greater than the first inner width along the horizontal direction and positioned above the first portion.

[0135] In other words, the anchor portion (200) may include a first portion and a second portion positioned above the first portion, and the cross-sectional shape of the first portion may not completely include the cross-sectional shape of the second portion in a plan view. Accordingly, the extension portion (30) may interfere from below between the first portion and the second portion, and may prevent the thermally conductive resin (3) from falling off downward from the floor plate (20).

[0136] For example, the anchor portion (200) may include a first portion having a rectangular cross-section extending along the longitudinal direction to a predetermined first inner width, and a second portion having a rectangular cross-section extending along the longitudinal direction to a predetermined second inner width greater than the first inner width, and positioned lower than the first portion.

[0137] As in the present embodiment, when the anchor part (200) is formed in a groove shape rather than a hole shape, the anchor part (200) cannot be processed from the upper surface of the floor plate (20) and must be processed from the lower surface, so it is very difficult to process the anchor part (200) to have an undercut shape as described above. At this time, when the anchor part (200) is processed in a groove shape extending from one horizontal end of the floor plate (20) to the other horizontal end, the anchor part (200) can be processed from the side, so it is easy to form an undercut shape.

[0138]

[0139] [Cars with built-in battery packs]

[0140] Hereinafter, with reference to FIG. 22, the structure of an automobile according to one embodiment of the present invention will be described.

[0141] Figure 22 illustrates a vehicle according to one embodiment of the present invention. Referring to this, the battery pack (P) according to one embodiment of the present invention may be installed in a vehicle (V) as a power source. The vehicle (V) may be a hybrid vehicle or an electric vehicle, but is not limited thereto. Furthermore, the vehicle (V) may be a two-wheeled vehicle or a four-wheeled vehicle, but is not limited thereto.

[0142]

[0143] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0144] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A battery module having a module frame; A pack frame having a base plate on which the above battery modules are mounted; and In a battery pack including a thermally conductive resin interposed between the bottom plate of the battery module and the bottom plate of the pack frame, The bottom plate of the above module frame is provided with a hole-shaped anchor portion, A battery pack, wherein the thermally conductive resin has an extension portion that extends upward and is filled into the anchor portion.

2. In claim 1, A battery pack in which the above anchor portions are arranged in a grid of three or more rows and three or more columns.

3. In claim 2, A battery pack in which the rows and columns of the above anchor portions are arranged at equal intervals.

4. In claim 1, A battery pack, wherein the anchor portion includes a first portion having a predetermined first internal width along a horizontal direction, and a second portion having a predetermined second internal width greater than the first internal width along the horizontal direction and positioned above the first portion.

5. In claim 4, A battery pack, wherein the anchor portion includes a first portion having a circular cross-section with a predetermined first inner diameter, and a second portion having a circular cross-section with a predetermined second inner diameter larger than the first inner diameter, and positioned above the first portion.

6. In claim 1, A battery pack, wherein the anchor portion includes a tapered portion whose cross-sectional area becomes narrower as it goes downward.

7. In claim 6, A battery pack, wherein the anchor portion includes a tapered portion having a circular cross-section whose inner diameter becomes smaller as it goes downward.

8. In claim 7, A battery pack, wherein the anchor portion includes a tapered portion having an inner circumferential surface in the shape of a cone whose inner diameter becomes smaller as it goes downward.

9. In claim 1, The above thermally conductive resin: An upper resin layer connected to the upper part of the floor plate of the above module frame; and A bottom resin layer connected to the bottom of the bottom plate of the above module frame; A battery pack in which the extension portion connects the upper resin layer and the lower resin layer through the anchor portion.

10. Battery module having a module frame; A pack frame having a base plate on which the above battery modules are mounted; and In a battery pack including a thermally conductive resin interposed between the bottom plate of the battery module and the bottom plate of the pack frame, The bottom plate of the above battery module is provided with an anchor part in the shape of a groove sunken upward, A battery pack, wherein the thermally conductive resin has an extension portion that extends upward and is filled into the anchor portion.

11. In claim 10, A battery pack in which the above anchor portions are arranged in multiple rows that extend side by side.

12. In claim 11, A battery pack in which the plurality of rows of the above anchor portions are arranged at equal intervals.

13. In claim 10, A battery pack, wherein the anchor portion includes a first portion having a predetermined first internal width along a horizontal direction, and a second portion having a predetermined second internal width greater than the first internal width along the horizontal direction and positioned above the first portion.

14. In claim 13, A battery pack, wherein the anchor portion includes a first portion having a rectangular cross-section extending along a longitudinal direction to a predetermined first internal width, and a second portion having a rectangular cross-section extending along a longitudinal direction to a predetermined second internal width greater than the first internal width, and positioned lower than the first portion. Battery pack.

15. In claim 10, A battery pack, wherein the anchor portion includes a tapered portion whose cross-sectional area becomes narrower as it goes downward.

16. In claim 15, A battery pack, wherein the anchor portion includes a tapered portion having a rectangular cross-section whose inner width becomes smaller as it goes downward.

17. In claim 16, A battery pack, wherein the anchor portion includes a tapered portion extending in the longitudinal direction and having a trapezoidal cross-section with an upper width greater than a lower width in the longitudinal direction.

18. A vehicle comprising a battery pack according to any one of claims 1 to 17.

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