Battery module

Abstract

A battery module includes a plurality of battery cells, an insulating sheet between the plurality of battery cells, and a cooling plate at one side of the plurality of battery cells, wherein each of the insulating sheets includes a pin-shaped flame-retardant sheet including a center portion at a center of the insulating sheet and an extension portion extending from the center portion in a direction intersecting a height direction of the center portion, a pair of first thermal insulating sheets at opposite sides of the center portion of the flame-retardant sheet, respectively, and a pair of second thermal insulating sheets at outer sides of the pair of first thermal insulating sheets, respectively.

Description

Technical Field

[0001] This disclosure relates to battery modules. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be repeatedly charged and discharged. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motors in hybrid and electric vehicles, as well as for energy storage. These secondary batteries include electrode assemblies containing positive and negative electrodes, a housing that houses the electrode assemblies, and electrode terminals that connect to the electrode assemblies.

[0003] The information disclosed in the background section is intended only to enhance the understanding of the background of this disclosure and may therefore include information that does not constitute prior art. Summary of the Invention

[0004] The purpose of this disclosure is to provide a battery module capable of delaying or preventing thermal propagation and thermal runaway between battery cells.

[0005] The purpose of this disclosure is to provide a battery module with improved stability.

[0006] However, the technical problems sought to be solved by this disclosure are not limited to those described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0007] According to one aspect of this disclosure, a battery module includes: a battery cell; an insulating sheet between adjacent battery cells; and a cooling plate located on one side of the battery cell. Each insulating sheet includes: a pin-shaped flame-retardant sheet including a central portion located at approximately the center of the insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion; a pair of first thermal insulating sheets located on opposite sides of the central portion of the flame-retardant sheet; and a pair of second thermal insulating sheets located outside the pair of first thermal insulating sheets.

[0008] According to an embodiment, a pair of first thermal insulation sheets may include aerogel.

[0009] According to an embodiment, a pair of second thermal insulation sheets may include mica.

[0010] According to the implementation, the extension may substantially cover the top or bottom of a pair of first thermal insulation sheets and a pair of second thermal insulation sheets.

[0011] According to an embodiment, the flame-retardant sheet may include at least one of a flame-retardant material and a heat-dissipating material.

[0012] According to an embodiment, the flame-retardant sheet may include: a first sheet located in the center and comprising a flame-retardant material; and a second sheet located on the opposite side of the first sheet and comprising a heat-dissipating material.

[0013] According to an embodiment, the second sheet may include an extension of the flame-retardant sheet.

[0014] According to embodiments, flame-retardant materials may include at least one of chlorine, bromine, and / or antimony.

[0015] According to embodiments, the heat dissipation material may include at least one of metallic materials, carbon-based materials, boron nitride nanotubes, and / or silicon composite materials.

[0016] According to the embodiment, the extension portion can be located on the side of the flame-retardant sheet opposite to the cooling plate.

[0017] According to another aspect, a battery module includes: a battery cell; an insulating sheet located between adjacent battery cells; and a cooling plate located on one side of the battery cell. Each insulating sheet includes: a pin-shaped flame-retardant sheet including a central portion substantially located at the center of the insulating sheet; a pair of first thermal insulating sheets located opposite to the central portion of the flame-retardant sheet; and a pair of second thermal insulating sheets located outside the pair of first thermal insulating sheets. The flame-retardant sheet substantially covers the top or bottom of the pair of first thermal insulating sheets and the pair of second thermal insulating sheets.

[0018] According to an embodiment, a pair of first thermal insulation sheets may include aerogel.

[0019] According to an embodiment, a pair of second thermal insulation sheets may include mica.

[0020] According to an embodiment, the flame retardant sheet may include a central portion located at the center of the insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion, and the extension portion may substantially cover the top of a pair of first thermal insulating sheets and a pair of second thermal insulating sheets.

[0021] According to an embodiment, the flame retardant sheet may include a central portion located substantially at the center of the insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion, and the extension portion may substantially cover the bottom of a pair of first thermal insulating sheets and a pair of second thermal insulating sheets.

[0022] According to an embodiment, the flame-retardant sheet may include at least one of a flame-retardant material and a heat-dissipating material.

[0023] According to an embodiment, the flame-retardant sheet may include: a first sheet, substantially located in the center and comprising a flame-retardant material; and a second sheet, located on the opposite side of the first sheet and comprising a heat-dissipating material, and the second sheet may include an extension portion.

[0024] According to embodiments, flame-retardant materials may include at least one of chlorine, bromine, and / or antimony.

[0025] According to embodiments, the heat dissipation material may include at least one of metallic materials, carbon-based materials, boron nitride nanotubes, and / or silicon composite materials.

[0026] According to the embodiment, the extension portion can be located on the side of the flame-retardant sheet opposite to the cooling plate. Attached Figure Description

[0027] The following figures illustrate preferred embodiments of the present disclosure and, together with the invention described below, serve to further understand the technical concept of the present disclosure. Therefore, the present disclosure should not be construed as limited to the contents described in these figures.

[0028] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 This is a perspective view schematically showing a battery module according to an embodiment of the present disclosure;

[0030] Figure 2 This is an exploded perspective view schematically showing a battery module according to an embodiment of the present disclosure;

[0031] Figure 3 It is shown schematically. Figure 1 and Figure 2 A perspective view of an example battery cell in a battery module;

[0032] Figure 4 It is a schematic representation of the path along Figure 3 An example cross-sectional view of the cross section taken by line III-III';

[0033] Figure 5 This is a perspective view schematically illustrating an example of a battery module according to an embodiment of the present disclosure, including an extended portion of a pin-shaped flame-retardant sheet and an insulating sheet.

[0034] Figure 6 This is a schematic cross-sectional view illustrating an example of a pin-shaped flame-retardant sheet and an insulating sheet, including extended portions, of a battery module according to an embodiment of the present disclosure.

[0035] Figure 7 This is a partial enlarged view of a battery module including a pin-shaped flame-retardant sheet with an extension portion, according to an embodiment of the present disclosure, showing... Figure 1 Region A;

[0036] Figure 8This is a perspective view schematically illustrating another example of a battery module according to an embodiment of the present disclosure, including an extended portion of a pin-shaped flame-retardant sheet and an insulating sheet.

[0037] Figure 9 This is a schematic cross-sectional view illustrating another example of a battery module according to an embodiment of the present disclosure, including an extended portion of a pin-shaped flame-retardant sheet and an insulating sheet.

[0038] Figure 10 This is a partial enlarged view of a battery module according to another embodiment, corresponding to Figure 1 In region A, the battery module includes a pin-shaped flame-retardant sheet with an extended portion;

[0039] Figure 11 This is a perspective view schematically illustrating an example of a battery module according to an embodiment of the present disclosure, including an extension portion and a pin-shaped flame-retardant sheet and an insulating sheet including a first sheet and a second sheet.

[0040] Figure 12 This is a schematic cross-sectional view illustrating an example of a battery module according to an embodiment of the present disclosure, including an extension portion and a first and a second pin-shaped flame-retardant sheet and an insulating sheet.

[0041] Figure 13 This is a partial enlarged view of the battery module according to the embodiment, corresponding to Figure 1 In region A, the battery module includes a pin-shaped flame retardant sheet, which includes an extension, a first sheet, and a second sheet.

[0042] Figure 14 This is a perspective view schematically illustrating another example of a battery module according to an embodiment of the present disclosure, including an insulating sheet and an extension portion, and a pin-shaped flame-retardant sheet including a first sheet and a second sheet.

[0043] Figure 15 This is a schematic cross-sectional view illustrating another example of a battery module according to an embodiment of the present disclosure, including an extension portion and a first and second piece of a pin-shaped flame-retardant sheet and an insulating sheet; and

[0044] Figure 16 This is a partial enlarged view of a battery module according to another embodiment, corresponding to Figure 1 In region A, the battery module includes a pin-shaped flame retardant sheet, which includes an extension, a first sheet, and a second sheet. Detailed Implementation

[0045] In the following description, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, and based on the principle that the inventor can appropriately define the concepts of terms in order to best interpret his or her own invention, they should be interpreted as meanings and concepts consistent with the technical ideas of this disclosure. Therefore, the embodiments described in this specification and the constructions shown in the drawings are only some of the most preferred embodiments of this disclosure and do not represent all the technical concepts of this disclosure. It should be understood that various equivalents and modifications may exist at the time of filing this application.

[0046] In some embodiments, when used in the specification, "comprising, including" and / or "containing, including" specifies the presence of the mentioned features, quantities, steps, operations, elements, components and / or groups thereof, but does not exclude the presence or addition of one or more other features, quantities, steps, operations, elements, components and / or groups thereof.

[0047] In some embodiments, the following figures are not drawn to scale to aid in understanding this disclosure, and the dimensions of some components may be exaggerated. In some embodiments, the same reference numerals may be assigned to the same components in different embodiments.

[0048] Although the terms "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another, and the first component can also be the second component, unless otherwise specified in the context.

[0049] Throughout this instruction manual, unless otherwise stated in the context, each part may be singular or plural.

[0050] The expression “top (or bottom)” or “above (or below)” of a component can mean not only that the component is positioned to contact the top or bottom surface of the component, but also that one or more other components can be inserted between the component and the component located above (or below) the component.

[0051] In some implementations, when a component is described as being “joined,” “connected,” or “in contact” with another component, it should be understood that these components may be directly connected or in contact with each other, but each component may be “joined,” “connected,” or “in contact” with another component via an additional component. Furthermore, when a component is electrically joined to another component, it includes not only their direct connection but also their connection using another element therebetween.

[0052] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When describing embodiments with reference to the drawings, the same or corresponding parts are indicated by the same reference numerals.

[0053] Figure 1 This is a perspective view schematically showing a battery module according to an embodiment of the present disclosure. Figure 2 This is an exploded perspective view schematically showing a battery module according to an embodiment of the present disclosure. Figure 3 It is shown schematically. Figure 1 and Figure 2 A perspective view of an example battery cell in a battery module. Figure 4 It is a schematic representation of the path along Figure 3 A cross-sectional view of an example of the cross section taken by line III-III'.

[0054] Reference Figure 1 and Figure 2 According to one aspect of the present disclosure, the battery module 100 may include: a plurality of battery cells 10; an insulating sheet 300 disposed between the plurality of battery cells 10; and a cooling plate 500 located on one side of the plurality of battery cells 10.

[0055] Reference Figure 3 and Figure 4 The battery cell 10 may include a battery casing 15, an electrode assembly 210 housed within the battery casing 15, and an electrolyte within the battery casing 15. The electrode assembly 210 and the electrolyte undergo an electrochemical reaction to generate energy.

[0056] On one side of the battery cell 10, terminals 11 and 12, each electrically connected to the connecting tab 20, an exhaust port 13 serving as a channel for venting internally generated gas, and an electrolyte injection port 14 for injecting electrolyte into the battery casing 15 are provided. Terminals 11 and 12 of the battery cell 10 can be first terminals 11 and second terminals 12 with different polarities. In some embodiments where the first terminal 11 is a positive electrode terminal, the second terminal 12 can be a negative electrode terminal. In some embodiments where the first terminal 11 is a negative electrode terminal, the second terminal 12 can be a positive electrode terminal. That is, the first terminal 11 and the second terminal 12 can have different polarities and are not limited to a specific polarity.

[0057] Terminals 11 and 12 of adjacent battery cells 10 can be electrically connected in series and / or in parallel via connecting tabs. In some embodiments, the first terminal 11 of one battery cell 10 can be electrically connected to the second terminal 12 of another adjacent battery cell 10 via connecting tabs, and the second terminal 12 of one battery cell 10 can be electrically connected to the first terminal 11 of another adjacent battery cell 10 via another connecting tab.

[0058] In some implementations, although in Figure 1 and Figure 2 The diagram illustrates the connection structure of a single battery cell, but this structure is not limited to it; various connection structures can be used as needed. In some embodiments, the number and arrangement of battery cells are not limited to... Figure 1 and Figure 2 The structure shown can be modified as needed.

[0059] Multiple battery cells 10 can be arranged in one direction (x) such that the main surfaces of the battery cells 10, which are their wide surfaces, face each other, and the multiple battery cells 10 arranged can be contained by a housing.

[0060] The housing may include a pair of end plates facing a wide surface of the battery cell 10, and a side plate and a bottom plate connecting the pair of end plates.

[0061] The side plate can support the side of the battery cell 10, and the bottom plate can support the bottom surface of the battery cell 10. In some embodiments, the end plate, side plate, and bottom plate can be connected by elements such as bolts.

[0062] In some embodiments, the battery cell 10 according to the present disclosure may include: at least one electrode assembly 210, in which a first electrode plate 211 and a second electrode plate 212 are alternately stacked and a separator 213 is located between the first electrode plate 211 and the second electrode plate 212, each of the first electrode plate 211 and the second electrode plate 212 including a plurality of sheets; and a housing 15 in which the electrode assembly 210 is housed.

[0063] The battery cell 10 according to this embodiment is illustrated as a prismatic lithium-ion battery cell. However, this disclosure is not limited thereto, and this disclosure can be applied to various types of battery cells, such as lithium polymer battery cells or cylindrical battery cells.

[0064] The first electrode plate 211 and the second electrode plate 212 may include a coated portion and a first uncoated portion 211a and a second uncoated portion 212a. The coated portion is the area where an active material is applied to a current collector including a thin metal foil, and the first uncoated portion 211a and the second uncoated portion 212a are areas where no active material is coated.

[0065] The electrode assembly 210 may be formed of a structure comprising alternating stacks of a first electrode plate 211 and a second electrode plate 212, including a plurality of sheets, with a diaphragm 213 located therebetween. However, this disclosure is not limited thereto, and the first electrode plate 211 and the second electrode plate 212 may be wound with a diaphragm 213 therebetween, wherein the diaphragm 213 is an insulator.

[0066] The housing 15 forms the overall appearance of the battery cell 10 and may comprise a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. In some embodiments, the housing 15 may provide space to accommodate the electrode assembly 210.

[0067] The battery cell 10 may include a cover 17 covering an opening in the housing 15, and the housing 15 and the cover 17 may be made of a conductive material. Here, the first terminal 11 and the second terminal 12, which are electrically connected to the first electrode plate 211 or the second electrode plate 212, may be provided to protrude outward through the cover 17.

[0068] In some embodiments, the outer peripheral surfaces of the upper posts of the first terminal 11 and the second terminal 12 protruding outward from the cover plate 17 may be threaded and secured to the cover plate 17 with nuts.

[0069] However, this disclosure is not limited thereto. The first terminal 11 and the second terminal 12 may have a rivet structure and may be riveted to the cover plate 17, or may be welded to the cover plate 17.

[0070] In some embodiments, cover 17 may include a sheet and be incorporated into an opening in housing 15, electrolyte injection port 14 configured to receive a sealing plug may be formed in cover 17, and vent port 13 with a notch may be installed.

[0071] The first terminal 11 and the second terminal 12 can be electrically connected to a current collector including a first current collector 240 and a second current collector 250, wherein the first current collector 240 and the second current collector 250 are welded to a first uncoated portion 211a of the first electrode plate and a second uncoated portion 212a of the second electrode plate.

[0072] In some embodiments, the first terminal 11 and the second terminal 12 can be fixed to the first current collector 240 and the second current collector 250 by welding, respectively. However, this disclosure is not limited thereto, and the first terminal 11, the second terminal 12, the first current collector 240 and the second current collector 250 can be integrally formed.

[0073] In some embodiments, an insulating element may be installed between the electrode assembly 210 and the cover plate 17. Here, the insulating element may include a first lower insulating element 260 and a second lower insulating element 270, each of which may be installed between the electrode assembly 210 and the cover plate 17.

[0074] In some embodiments, according to this embodiment, one end of the separator element, which can be positioned to face the electrode assembly 210, can be located between the insulating element and the first terminal 11 and the second terminal 12. Here, the separator element may include a first separator element 280 and a second separator element 290.

[0075] Therefore, one end of the first separating element 280 and one end of the second separating element 290, which can be positioned on the side facing the electrode assembly 210, can be located between the first lower insulating element 260 and the first terminal 11 and between the second lower insulating element 270 and the second terminal 12.

[0076] Finally, the first terminal 11 and the second terminal 12 welded to the first current collector 240 and the second current collector 250 can be combined with one end of the first lower insulating element 260 and the second lower insulating element 270, as well as one end of the first separating element 280 and the second separating element 290.

[0077] Each insulating sheet is located between multiple battery cells 10 and is configured to prevent (or at least mitigate) heat propagation and flame spread between the multiple battery cells 10.

[0078] According to an embodiment of the present disclosure, a battery module 100 includes insulating sheets 300, 300', 400, and 400' located between a plurality of battery cells 10, and each of the insulating sheets 300, 300', 400, and 400' may respectively include: pin-shaped (e.g., T-shaped) flame-retardant sheets 322, 322', 422, and 422', respectively including central portions 322a, 322a', 422a, and 422a' located at the center of the insulating sheets 300, 300', 400, and 400', and respectively extending from the central portions 322a, 322a', 422a, and 422a' along the central portions 322a, 322a', 422a', and 422a'. Extensions 322b, 322b', 422b, and 422b' extending in the directions where their height directions intersect; a pair of first thermally insulating sheets 324, 324', 424, and 424', located on opposite sides (left and right sides in the figure) of the central portions 322a, 322a', 422a, and 422a' of the flame-retardant sheets 322, 322', 422, and 422', respectively; and a pair of second thermally insulating sheets 326, 326', 426, and 426', located on the outer side (left and right sides in the figure) of each of the pair of first thermally insulating sheets 324, 324', 424, and 424' (see figure). Figure 1 as well as Figures 5 to 15 In one or more embodiments, the central portions 322a, 322a', 422a and 422a' may extend substantially perpendicular to the extension portions 322b, 322b', 422b and 422b', respectively.

[0079] According to an embodiment, the first thermal insulating sheets 324, 324', 424, 424' may include aerogel, and the second thermal insulating sheets 326, 326', 426, 426' may include mica (MICA). Aerogel is a transparent or translucent material with a nanoporous structure and is used as a thermal insulating material due to its very low density and low thermal conductivity, while mica has high heat resistance, thus effectively blocking heat even in high-temperature environments and is used as a thermal insulating material.

[0080] The insulating sheets 300, 300', 400, and 400' of the battery module 100 according to embodiments of the present disclosure are configured to have a multilayer structure, which includes a second thermal insulating sheet 326, 326', 426, 426' including mica, a first thermal insulating sheet 324, 324', 424, 424' including aerogel, and pin-shaped flame-retardant sheets 322, 322', 422, and 422', thereby effectively delaying and preventing (or at least mitigating) heat transfer between battery cells 10, making it possible to delay or prevent thermal runaway, and improving the stability of the battery module 100.

[0081] Furthermore, the insulating sheets 300, 300', 400 and 400' of the battery module 100 according to the present disclosure can stably support or fix the thermal insulating sheets constituting the insulating sheets 300, 300', 400 and 400' by including pin-shaped flame-retardant sheets 322, 322', 422 and 422', thereby improving the structural stability of the insulating sheets 300, 300', 400 and 400', and thus improving the internal structural stability of the battery module 100.

[0082] Figure 5 This is a perspective view schematically illustrating an example of a pin-shaped flame-retardant sheet and an insulating sheet, including extended portions, of a battery module according to an embodiment of the present disclosure. Figure 6 This is a schematic cross-sectional view illustrating an example of a pin-shaped flame-retardant sheet and an insulating sheet, including extended portions, of a battery module according to an embodiment of the present disclosure. Figure 7 This is a partial enlarged view of a battery module including a pin-shaped flame-retardant sheet with an extension portion, according to an embodiment of the present disclosure, showing... Figure 1 Region A.

[0083] Reference Figures 5 to 7According to embodiments of the present disclosure, the battery module 100 may include: a pin-shaped flame-retardant sheet 322, the pin-shaped flame-retardant sheet 322 including a central portion 322a located at the center (or approximately the center) of the insulating sheet 300 and an extension portion 322b extending from one end (e.g., the upper end) of the central portion 322a in a direction intersecting (e.g., substantially perpendicular to) the height direction of the central portion 322a; a pair of first thermal insulating sheets 324, respectively located on opposite sides (e.g., left and right sides) of the central portion 322a of the flame-retardant sheet 322; and a pair of second thermal insulating sheets 326, respectively located outside (e.g., left and right sides) of each of the pair of first thermal insulating sheets 324.

[0084] In an embodiment, the pin-shaped flame retardant sheet 322 may include a central portion 322a located at the center (or approximately the center) of the insulating sheet 300 and an extension portion 322b extending from the top of the central portion 322a in a direction intersecting (e.g., substantially perpendicular to) the height direction of the central portion 322a.

[0085] In some embodiments, the flame retardant sheet 322 includes an extension 322b, and the extension 322b may cover (or substantially cover) the top of a pair of first thermal insulation sheets 324 and second thermal insulation sheets 326.

[0086] Heat transferred between the battery cells 10 moves from higher temperature regions to lower temperature regions. Therefore, heat moves to the cooling plate or exhaust flow path, and when the heat is not sufficiently dissipated, thermal runaway can occur between adjacent battery cells.

[0087] According to embodiments of this disclosure, the battery module 100 has a flame-retardant sheet 322 comprising a pin-shaped flame-retardant material located on the insulating sheet 300 between the battery cells 10, such that even if excessive heat is generated in the battery cells 10 inside the battery module 100, the pin-shaped flame-retardant sheet 322 will block the heat (or at least mitigate the heat transfer), thereby preventing heat from being transferred to the surrounding battery cells 10. Furthermore, the heat blocked by the extension portion 322b of the flame-retardant sheet 322 can be guided to a cooling plate 500 located on one side (e.g., the bottom side) of the battery cells 10 and the insulating sheet 300, and then dissipated.

[0088] In some embodiments, the extensions 322b, 322b', 422b, and 422b' of the flame retardant sheets 322, 322', 422, and 422' can be located on the opposite side of the cooling plate 500 (e.g., the extensions 322b, 322b', 422b, and 422b' can be on the upper end of the central portions 322a, 322a', 422a, and 422a', and the cooling plate 500 can be on the lower end of the central portions 322a, 322a', 422a, and 422a'). Therefore, heat that is prevented from moving to the adjacent battery cell 10 due to the extensions 322b, 322b', 422b, and 422b' of the flame retardant sheets 322 can be moved to the cooling plate 500 located on the opposite side, and the heat can then be dissipated.

[0089] Figure 8 This is a perspective view schematically illustrating another example of a battery module according to an embodiment of the present disclosure, including an extended pin-shaped flame-retardant sheet and an insulating sheet. Figure 9 This is a schematic cross-sectional view illustrating another example of a battery module according to an embodiment of the present disclosure, including an extended pin-shaped flame-retardant sheet and an insulating sheet. Figure 10 This is a partial enlarged view of a battery module according to another embodiment, corresponding to Figure 1 In region A, the battery module includes a pin-shaped flame-retardant sheet with an extension.

[0090] Reference Figures 8 to 10 According to embodiments of the present disclosure, a battery module 100 may include a pin-shaped flame-retardant sheet 322', a pair of first thermal insulation sheets 324', and a pair of second thermal insulation sheets 326'. The pin-shaped flame-retardant sheet 322' includes a central portion 322a' located at the center (or substantially the center) of the insulation sheet 300' and an extension portion 322b' extending from the central portion 322a' in a direction intersecting the height direction of the central portion 322a' (e.g., the extension portion 322b' may extend substantially perpendicular to the lower end of the central portion 322a'). The pair of first thermal insulation sheets 324' are respectively located on opposite sides (e.g., left and right) of the central portion 322a' of the flame-retardant sheet 322', and the pair of second thermal insulation sheets 326' are respectively located outside (e.g., left and right) of each of the pair of first thermal insulation sheets 324'.

[0091] In an embodiment, the pin-shaped flame retardant sheet 322' may include a central portion 322a' located at the center (or substantially the center) of the insulating sheet 300' and an extension portion 322b' extending from the bottom of the central portion 322a' in a direction intersecting (e.g., substantially perpendicular to the height direction) with the height direction of the central portion 322a'.

[0092] In some embodiments, the flame retardant sheet includes an extension 322b', and the extension 322b' may cover (or substantially cover) the bottom of a pair of first thermal insulation sheets 324' and second thermal insulation sheets 326'.

[0093] Furthermore, the heat blocked (or at least mitigated) by the extension 322b' of the flame retardant sheet 322' can be moved to the cooling plate 500 located on one side (e.g., the upper or lower side) of the battery cell 10 and the insulating sheet 300', and then dissipated.

[0094] Figure 11 This is a perspective view schematically illustrating an example of a battery module according to an embodiment of the present disclosure, including an extension portion and a pin-shaped flame-retardant sheet and an insulating sheet comprising a first sheet and a second sheet. Figure 12 This is a schematic cross-sectional view illustrating an example of a battery module according to an embodiment of the present disclosure, including an extension portion and a first and second pin-shaped flame-retardant sheet and an insulating sheet. Figure 13 This is a partial enlarged view of a battery module including a pin-shaped flame-retardant sheet according to an embodiment, corresponding to... Figure 1 In region A, the pin-shaped flame retardant sheet includes an extension, a first sheet, and a second sheet.

[0095] The flame-retardant sheets 322, 322', 422 and 422' of the battery module 100 according to embodiments of the present disclosure may include at least one of flame-retardant material and heat-dissipating material.

[0096] Reference Figures 11 to 13 According to embodiments of the present disclosure, the battery module 100 may include: a pin-shaped flame-retardant sheet 422, including a central portion 422a located at the center (or approximately the center) of the insulating sheet 400 and an extension portion 422b extending from the central portion 422a in a direction intersecting (e.g., substantially perpendicular to the height direction) the height direction of the central portion 422a; a pair of first thermal insulating sheets 424, respectively located on opposite sides (e.g., left and right sides) of the central portion 422a of the flame-retardant sheet 422; and a pair of second thermal insulating sheets 426, respectively located outside (e.g., left and right sides) of each of the pair of first thermal insulating sheets 424.

[0097] In an embodiment, the pin-shaped flame retardant sheet 422 may include a central portion 422a located at the center (or approximately the center) of the insulating sheet 400 and an extension portion 422b extending from the top of the central portion 422a in a direction intersecting (e.g., substantially perpendicular to the height direction) the height direction of the central portion 422a.

[0098] In some embodiments, the flame retardant sheet 422 includes an extension 422b, and the extension 422b may cover (or substantially cover) the top of a pair of first thermal insulation sheets 424 and second thermal insulation sheets 426.

[0099] Furthermore, the flame-retardant sheet 422 of the battery module 100 according to embodiments of the present disclosure includes a first sheet 422c located at the center (or approximately the center) and comprising a flame-retardant material, and a second sheet 422d located on the opposite side (e.g., the left and right sides) of the first sheet 422c and comprising a heat-dissipating material. The second sheet 422d may include an extension portion 422b of the flame-retardant sheet 422.

[0100] Figure 14 This is a perspective view schematically illustrating an example of a battery module according to an embodiment of the present disclosure, including an extension portion and a pin-shaped flame-retardant sheet and an insulating sheet including a first sheet and a second sheet. Figure 15 This is a schematic cross-sectional view illustrating another example of a battery module according to an embodiment of the present disclosure, including an extension portion and a first and second pin-shaped flame-retardant sheet and an insulating sheet. Figure 16 This is a partial enlarged view of the battery module according to the embodiment, corresponding to Figure 1 In region A, the battery module includes a pin-shaped flame-retardant sheet comprising an extension, a first sheet, and a second sheet.

[0101] Reference Figures 14 to 16 According to embodiments of the present disclosure, a battery module 100 may include a pin-shaped flame-retardant sheet 422', a pair of first thermal insulation sheets 424', and a pair of second thermal insulation sheets 426'. The pin-shaped flame-retardant sheet 422' includes a central portion 422a' located at the center (or substantially the center) of the insulation sheet 400' and an extension portion 422b' extending from the central portion 422a' in a direction intersecting (e.g., substantially perpendicular to the height direction) with the height direction of the central portion 422a'. The pair of first thermal insulation sheets 424' are respectively located on opposite sides (e.g., left and right) of the central portion 422a' of the flame-retardant sheet 422', and the pair of second thermal insulation sheets 426' are respectively located on the outer side (e.g., left and right) of each of the pair of first thermal insulation sheets 424'.

[0102] In an embodiment, the pin-shaped flame retardant sheet 422' may include a central portion 422a' located at the center (or substantially the center) of the insulating sheet 400' and an extension portion 422b' extending from the bottom of the central portion 422a' in a direction intersecting the height direction of the central portion 422a' (e.g., substantially perpendicular to the height direction).

[0103] In some embodiments, the flame retardant sheet 422' includes an extension 422b', and the extension 422b' may cover (or substantially cover) the bottom of a pair of first thermal insulation sheets 424' and second thermal insulation sheets 426'.

[0104] Furthermore, the flame-retardant sheet 422' of the battery module 100 according to the embodiments of the present disclosure includes a first sheet 422c' located at the center (or substantially at the center) and comprising flame-retardant material, and a second sheet 422d' located on the opposite side (e.g., left and right sides) of the first sheet 422c' and comprising heat-dissipating material, and the second sheet 422d' may include an extension portion 422b' of the flame-retardant sheet 422'.

[0105] When heat is transferred between battery cells 10, it must move rapidly through the cooling plate 500 to dissipate. Flame-retardant sheets 422 and 422' allow for rapid heat transfer and dissipation via second sheets 422d and 422d', which comprise a heat-dissipating material with high thermal conductivity and a high melting point. However, when heat is not sufficiently dissipated through the second sheets 422d and 422d', the first sheets 422c and 422c' can block the heat, thereby delaying or preventing heat transfer to adjacent battery cells 10 and also preventing flames.

[0106] In some embodiments, the flame-retardant material that may be included in the flame-retardant sheets 322, 322', 422, and 422' may be a material having low thermal conductivity and high dielectric strength. Although not limited thereto, the flame-retardant material of the battery module 100 according to embodiments of this disclosure may include at least one of chlorine, bromine, and / or antimony. When heat or flame is generated in the battery cell 10, the flame-retardant material can prevent (or at least mitigate) the spread of heat or flame to another adjacent battery cell 10 by reducing the activity of the combustion reaction and reducing heat dissipation due to the generation of hydrogen bromide and antimony bromide during the combustion process.

[0107] According to embodiments of this disclosure, the heat dissipation material that can be included in the flame retardant sheets 322, 322', 422 and 422' may include at least one of a metallic material, a carbon-based material, boron nitride nanotubes and / or a silicon composite material.

[0108] The heat dissipation material may include a metallic material with high thermal conductivity and high temperature resistance that can increase the heat conduction path, and may include a carbon-based material with high thermal conductivity. Although this disclosure is not limited thereto, the heat dissipation material of the battery module 100 according to embodiments of this disclosure may include silver or copper, and may include diamond, graphite, graphene and / or carbon nanotubes (CNTs).

[0109] In some embodiments, the heat dissipation material may include a material that can both dissipate heat and provide insulation, thereby acting as insulation between the battery cells 10. Although this disclosure is not limited thereto, the heat dissipation material of the battery module 100 according to embodiments of this disclosure may include boron nitride nanotubes (BNNT) and silicon composite materials.

[0110] In one or more embodiments, the heat dissipation material may include a material having a higher thermal conductivity and a lower coefficient of thermal expansion compared to other materials. Although this disclosure is not limited thereto, the heat dissipation material of the battery module 100 according to embodiments of this disclosure may include a hybrid heat dissipation material in which metals and carbon-based materials are combined, and the hybrid heat dissipation material may be a material in which copper and diamond are combined.

[0111] According to embodiments, the battery module of this disclosure can delay or prevent (or at least mitigate) heat propagation and thermal runaway between battery cells.

[0112] According to the embodiments, the battery stability of this disclosure can be improved.

[0113] However, the effects that can be obtained through this disclosure are not limited to those described above, and those skilled in the art can clearly understand from the description above other technical effects not mentioned.

[0114] Although this disclosure has been described with reference to limited embodiments and drawings, it is not limited thereto, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit of the invention and the scope of the equivalents described in the appended claims.

Claims

1. A battery module, comprising: Multiple battery cells; Multiple insulating sheets, each of the multiple insulating sheets being located between a pair of adjacent battery cells in the multiple battery cells; as well as A cooling plate is located on one side of each of the plurality of battery cells. Each of the plurality of insulating sheets includes: The pin-shaped flame retardant sheet includes a central portion located at the center of each insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion; A pair of first thermally insulating sheets, respectively located on opposite sides of the central portion of the pin-shaped flame-retardant sheet; and A pair of second thermal insulation sheets are located on the outside of the pair of first thermal insulation sheets.

2. The battery module according to claim 1, wherein, The pair of first thermal insulation sheets comprise aerogel.

3. The battery module according to claim 2, wherein, The pair of second thermal insulation sheets comprise mica.

4. The battery module according to claim 1, wherein, The extension covers the top or bottom of the pair of first thermal insulation sheets and the pair of second thermal insulation sheets.

5. The battery module according to claim 1, wherein, The pin-shaped flame-retardant sheet includes at least one of flame-retardant material and heat-dissipating material.

6. The battery module according to claim 5, wherein, The pin-shaped flame retardant sheet includes: The first piece, located at the center and comprising the flame-retardant material; and The second piece is located on the opposite side of the first piece and includes the heat dissipation material.

7. The battery module according to claim 6, wherein, The second piece includes the extended portion of the pin-shaped flame retardant sheet.

8. The battery module according to claim 5, wherein, The flame-retardant material includes at least one of chlorine, bromine, and antimony.

9. The battery module according to claim 5, wherein, The heat dissipation material includes at least one of metallic materials, carbon-based materials, boron nitride nanotubes, and silicon composite materials.

10. The battery module according to claim 1, wherein, The extension portion is located on the side of the pin-shaped flame-retardant sheet opposite to the cooling plate.

11. A battery module, comprising: Multiple battery cells; Multiple insulating sheets, each of the multiple insulating sheets being located between a pair of adjacent battery cells in the multiple battery cells; as well as A cooling plate is located on one side of the plurality of battery cells. Each of the plurality of insulating sheets includes: The pin-shaped flame-retardant sheet includes a central portion located at the center of each insulating sheet; A pair of first thermally insulating sheets, respectively located on opposite sides of the central portion of the pin-shaped flame-retardant sheet; and A pair of second thermal insulating sheets are respectively located outside the pair of first thermal insulating sheets; and The pin-shaped flame-retardant sheet covers the top or bottom of the pair of first thermal insulation sheets and the pair of second thermal insulation sheets.

12. The battery module according to claim 11, wherein, The pair of first thermal insulation sheets comprise aerogel.

13. The battery module according to claim 12, wherein, The pair of second thermal insulation sheets comprise mica.

14. The battery module according to claim 11, wherein: The pin-shaped flame-retardant sheet includes a central portion located at the center of each insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion, and The extension covers the top of the pair of first thermal insulation sheets and the pair of second thermal insulation sheets.

15. The battery module according to claim 11, wherein: The pin-shaped flame-retardant sheet includes a central portion located at the center of each insulating sheet and an extension portion extending from the central portion in a direction intersecting the height direction of the central portion. The extension covers the bottom of the pair of first thermal insulation sheets and the pair of second thermal insulation sheets.

16. The battery module according to claim 14 or 15, wherein, The pin-shaped flame-retardant sheet includes at least one of flame-retardant material and heat-dissipating material.

17. The battery module according to claim 16, wherein: The pin-shaped flame-retardant sheet includes a first sheet and a second sheet. The first sheet is located at the center of the pin-shaped flame-retardant sheet and includes the flame-retardant material. The second sheet is located on the opposite side of the first sheet and includes the heat-dissipating material. The second piece includes the extended portion.

18. The battery module according to claim 16, wherein, The flame-retardant material includes at least one of chlorine, bromine, and antimony.

19. The battery module according to claim 16, wherein, The heat dissipation material includes at least one of metallic materials, carbon-based materials, boron nitride nanotubes, and silicon composite materials.

20. The battery module according to claim 14 or 15, wherein, The extension portion is located on the side of the pin-shaped flame-retardant sheet opposite to the cooling plate.

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