Battery module

Abstract

With respect to battery modules, the technical challenge to be addressed is to provide a battery module that can improve cooling efficiency and / or reduce the amount of fire extinguishing agent required. [Solution] A battery module (1000) is provided, which includes a plurality of secondary batteries (100), a housing (200) that houses the plurality of secondary batteries (100), a flow path (300) that sprays a fire extinguishing agent (301) into the internal space of the housing (200) at a temperature of 1 or higher, and a cooling sheet (400) located at least one of the plurality of secondary batteries (100) that absorbs the fire extinguishing agent (301).

Description

Technical Field

[0001] The present disclosure relates to a battery module including a cooling sheet.

[0002] Reference to Related Applications This application claims priority based on Korean Patent Application No. 10-2024-0130979, filed with the Korean Intellectual Property Office on September 26, 2024, the entire disclosure of which is incorporated herein by reference.

Background Art

[0003] A secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Low-capacity secondary batteries are used in portable small electronic devices such as smartphones, feature phones, notebook computers, digital cameras, and video cameras, and high-capacity batteries are widely used as power sources for motor drives such as hybrid vehicles and electric vehicles, and batteries for power storage. Such a secondary battery includes an electrode including a positive electrode and / or a negative electrode, an electrode assembly including the electrode, a case housing the electrode assembly, electrode terminals connected to the electrode assembly, and the like.

[0004] With the increasing demand for secondary batteries, the use in the form of modules including a plurality of secondary batteries instead of a single secondary battery has been increasing. As shown in Patent Document 1, a battery module generally includes a plurality of secondary batteries. The battery module can be used by electrically connecting a plurality of secondary batteries.

[0005] The aforementioned information disclosed in the technology that is the background of such an invention is only for improving the understanding of the background of the present invention, and thus may also include information that does not constitute the prior art.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] One embodiment of the present invention aims to provide a battery module that includes a cooling sheet.

[0008] One embodiment of the present invention is intended to provide a battery module that includes a channel for spraying a fire extinguishing agent.

[0009] One embodiment of the present invention aims to provide a battery module that includes a cooling sheet capable of improving cooling efficiency while reducing the amount of fire extinguishing agent.

[0010] However, the technical problems that the present invention aims to solve 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 of the invention below. [Means for solving the problem]

[0011] A battery module according to one embodiment of the present invention for solving the aforementioned technical problems includes a plurality of secondary batteries, a housing for housing the plurality of secondary batteries, a flow path for injecting a fire extinguishing agent into the internal space of the housing at a temperature of 1 or higher, and a cooling sheet located at least one of the plurality of secondary batteries for absorbing the fire extinguishing agent. [Effects of the Invention]

[0012] According to one embodiment of the present invention, a battery module with improved cooling efficiency can be provided.

[0013] For example, according to one embodiment of the present invention, the cooling rate can be improved.

[0014] For example, according to one embodiment of the present invention, the amount of fire extinguishing agent can be reduced.

[0015] However, the effects that can be obtained through the present invention are not limited to the above-described effects, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

Brief Description of the Drawings

[0016] The drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further understand the technical idea of the present invention together with the detailed description of the invention to be described later. Therefore, the present invention should not be construed as being limited only to the matters described in such drawings. [Figure 1] FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a secondary battery according to an embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of a secondary battery according to an embodiment of the present invention. [Figure 4] FIG. 4 is an internal perspective view of a housing according to an embodiment of the present invention. [Figure 5] FIG. 5 is a perspective view for explaining the inside of a battery module in a state where a fire extinguishing agent is sprayed according to an embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view of a cooling sheet according to an embodiment of the present invention. [Figure 7] FIG. 7 is a diagram schematically explaining the operation process of a cooling sheet according to an embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view of a cooling sheet according to an embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view of a cooling sheet according to an embodiment of the present invention. [Figure 10] FIG. 10 is a diagram schematically explaining the operation process of a cooling sheet according to an embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view of a cooling sheet according to an embodiment of the present invention. [Figure 12]FIG. 12 is a side view of a cooling sheet according to an embodiment of the present invention. [Figure 13] FIG. 13 is a perspective view of a cooling sheet according to an embodiment of the present invention. [Figure 14] FIG. 14 is a diagram schematically explaining the operation process of a cooling sheet according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventor should interpret them in accordance with the technical idea of the present invention based on the principle that he can appropriately define the concept of the terms in order to explain his invention in the best way. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. It should be understood that there may be various equivalents and modifications that can replace them at the time of this application. Also, when used in this specification, "comprise, include" and / or "comprising, including" identify the presence of the recited shapes, numbers, steps, operations, members, elements and / or groups thereof, and do not exclude the presence or addition of one or more other shapes, numbers, operations, members, elements and / or groups. Also, when describing embodiments of the present invention, "can be" and "can be" may include "one or more embodiments of the present invention".

[0018] Also, for the purpose of assisting in understanding the invention, the accompanying drawings are not illustrated at actual scale, and the dimensions of some components may be exaggerated. Also, the same reference numerals may be assigned to the same components in different embodiments.

[0019] The statement that two comparison objects are "identical" means that they are "substantially identical." Therefore, substantial identity may include deviations that are considered low in this industry, for example, deviations of 5% or less. Furthermore, the uniformity of a parameter within a given domain may mean uniformity from an average perspective.

[0020] Although terms such as "first," "second," etc., are used to describe various components, these components are, of course, not limited by these terms. These terms are used solely to distinguish one component from another, and unless otherwise stated, the first component may be the second component.

[0021] Throughout the specification, unless otherwise stated, each component may be singular or plural.

[0022] The placement of any component "above (or below)" or "above (or below)" a component may mean not only that any component is placed in contact with the top (or bottom) surface of the component, but also that other components may be interposed between the component and any component placed on (or below) it.

[0023] Furthermore, when it is stated that any component is “connected,” “joined,” or “connected” to another component, it should be understood that the components may be directly connected to or joined to one another, but may also be “interposed” between each component, or each component may be “connected,” “joined,” or “connected” through another component. Also, when it is said that any part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where they are connected with another element in between.

[0024] Throughout the specification, when we say "A and / or B," it means A, B, or A and B unless otherwise specified. That is, "and / or" includes all or any combination of the enumerated items. When we say "C to D," it means C or greater and D or less, unless otherwise specified.

[0025] When syntax such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group A, B, and C", or "at least one selected from A, B, and C" is used to specify an inventory of elements A, B, and C, the syntax can refer to any suitable combination.

[0026] The term “use” may be considered synonymous with the term “utilize.” As used herein, “substantially,” “about,” and similar terms are used as approximations, not terms of degree, to account for the inherent variation in measured or calculated values ​​as perceived by a general expert in the art.

[0027] In this specification, terms such as first, second, third, etc., may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. The terms are used to distinguish one element, component, region, drawing layer, or section from other elements, components, regions, drawing layers, or sections. Accordingly, the first elements, components, regions, layers, or sections discussed below may be named second elements, components, regions, layers, or sections without departing from the teaching of the exemplary embodiments.

[0028] As shown in the drawings, spatial relative terms such as “beneath,” “below,” “lower,” “above,” and “upper” may be used herein for ease of explanation to describe the relationship between one element or feature and another. Spatially relative positions are understood to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figure. For example, if the device in the drawing is inverted, an element described as “beneath” or “below” another element will be understood as “above” or “upper” a different element. Thus, the term “beneath” can encompass both upward and downward directions.

[0029] The terms used herein are for the purpose of describing embodiments of the disclosure and are not intended to limit the disclosure.

[0030] In this specification, the x-axis represents the width direction of the battery module 1000. In this specification, the y-axis represents the length direction of the battery module 1000, with the y-axis perpendicular to the x-axis. In this specification, the z-axis represents the height direction of the battery module 1000, with the z-axis perpendicular to both the x-axis and the y-axis.

[0031] Figure 1 is a perspective view of a battery module according to one embodiment of the present invention.

[0032] In Figure 1, 1000 represents a battery module 1000 according to one embodiment of the present invention.

[0033] The battery module 1000 includes a plurality of secondary batteries 100 and a housing 200 that houses the plurality of secondary batteries 100.

[0034] The battery module 1000 includes a plurality of secondary batteries 100. The secondary batteries 100 can function as unit structures that store and supply power in the battery module 1000.

[0035] The secondary battery 100 includes, for example, a battery cell in which the case 20 of the secondary battery 100 (see Figure 2) is formed in a rectangular shape. However, the shape of the secondary battery 100 applicable to the battery module 1000 according to one embodiment of the present invention is not limited thereto. For example, the secondary battery 100 may be formed in various forms such as pouch type, cylindrical type, coin type, etc. Below, the case in which the battery cell included in the battery module 1000 is formed in a rectangular shape will be described as an example.

[0036] Multiple secondary batteries 100 are arranged inside the housing 200. In this configuration, the housing 200 forms the general appearance of the battery module 1000. The housing 200 can function as a structure that supports the multiple secondary batteries 100 as a whole.

[0037] The housing 200 accommodates multiple secondary batteries 100 within its internal space.

[0038] Multiple secondary batteries 100 are arranged in a first direction within the internal space of the housing 200.

[0039] The first direction may be the same direction as the longitudinal direction (y) of the battery module 1000. For example, the secondary battery 100 includes a first side and a second side that face each other. In this case, the first side and the second side include a broad surface on the side of the secondary battery 100. For example, multiple secondary batteries 100 may be arranged so that the first side of one secondary battery faces the second side of an adjacent battery cell. In this case, the first direction is the direction from the first side to the second side.

[0040] The housing 200 may include an end plate 210 that forms an internal space for housing the secondary battery 100, a side plate 220, and a bottom plate 230.

[0041] The end plate 210 forms part of the side surface of the housing 200. For example, the end plate 210 forms the side surface of the housing 200 that is located in a first direction. Thus, the end plate 210 may be formed opposite a wider surface on the side surface of the secondary battery 100. For example, the end plate 210 can be formed as a pair of two end plates facing each other, forming both sides of the housing 200.

[0042] The secondary battery 100 may undergo a swelling phenomenon, where it expands due to repeated charging and discharging. In this case, the swelling phenomenon may be more pronounced on relatively wider sides of the secondary battery 100. The end plate 210 can restrain the secondary battery 100 from expanding and / or support the appearance of the housing 200, even if the swelling phenomenon occurs in the secondary battery 100.

[0043] The side plates 220 form another part of the side surface of the housing 200. For example, the side plates 220 form the side surface of the housing 200 located in a second direction. In this case, the second direction may be the same direction as the width direction (x-axis) of the battery module 1000. In this case, the second direction may be perpendicular to the first direction. For example, the side plates 220 can be formed by a pair of side plates facing each other, forming the other two sides of the housing 200. In this case, one side and the other side of the side plates 220 may each be connected to a pair of end plates 210.

[0044] The lower plate 230 forms the lower surface of the housing 200. The lower plate 230 can, for example, support multiple secondary batteries 100 at the bottom. The lower plate 230 may be connected to the end plate 210 and the side plate 220.

[0045] Through this configuration, the housing 200 can form an internal space created by the end plate 210, the side plate 220, and the lower plate 230.

[0046] Figure 2 is a perspective view of a secondary battery according to one embodiment of the present invention.

[0047] Figure 3 is a cross-sectional view of a secondary battery according to one embodiment of the present invention.

[0048] A secondary battery 100 according to one embodiment of the present invention may include at least one electrode assembly wound with a separator membrane 13 acting as an insulator interposed between a positive electrode 11 and a negative electrode 12, a case 20 in which the electrode assembly is housed, and a cap assembly 30 coupled to the opening of the case 20.

[0049] In the following description, the secondary battery 100 will be explained as a prismatic lithium-ion secondary battery. However, the present invention is not limited thereto, and the secondary battery 100 may be a lithium polymer battery or a cylindrical battery.

[0050] The positive electrode 11 and the negative electrode 12 may include a coated portion which is a region where an active material is applied to a current collector formed from a thin metal foil, and plain portions 11a and 12a which are regions where the active material is not coated.

[0051] The positive electrode 11 and the negative electrode 12 can be wound up after a separator membrane 13 acting as an insulator is interposed between them. However, the present invention is not limited thereto, and the electrode assembly may have a structure in which multiple sheets of positive and negative electrodes are alternately stacked with a separator membrane in between.

[0052] The case 20 forms the overall appearance of the secondary battery 100 and may be made of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. The case 20 can also provide a space for housing the electrode assembly.

[0053] The cap assembly 30 may include a cap plate 31 that covers the opening of the case 20, and the case 20 and the cap plate 31 may be made of a conductive material. Here, the terminal 21 electrically connected to the positive electrode 11 or the negative electrode 12 may be installed so as to pass through the cap plate 31 and protrude outward.

[0054] Furthermore, the terminals 21 protruding from the outside of the cap plate 31 may be formed in pairs. The pair of terminals 21 can be connected to the positive electrode 11 and the negative electrode 12, respectively, and function as the positive and negative terminals of the secondary battery 100.

[0055] More specifically, the terminal 21 may be electrically connected to a current collector that includes first and second current collectors 40, 50 (hereinafter referred to as positive and negative current collectors) welded to the positive or negative plain portion 11a or negative plain portion 12a. For example, a pair of terminals 21 may be welded to the positive and negative current collectors 40, 50, respectively. However, the present invention is not limited thereto, and the terminal 21 and the positive and negative current collectors 40, 50 may also be formed by integrally joining them. The outer circumferential surface of the upper column of the terminal 21 may be threaded and fixed to the cap plate 31 with a nut.

[0056] However, the present invention is not limited thereto, and the terminal 21 may have a rivet structure and be riveted together, or welded to the cap plate 31.

[0057] Furthermore, the cap plate 31 may be made of a thin plate and may be coupled to the opening of the case 20. The cap plate 31 may have an electrolyte inlet 32 ​​on which a sealing plug 33 can be installed, and a vent 34 may be installed.

[0058] The vent 34 may open and close in conjunction with changes in the internal pressure of the case 20. That is, the vent 34 can remain closed during normal operation of the electrode assembly, thereby sealing the case 20. The vent 34 can be opened when the internal pressure of the case 20 rises above a predetermined size due to overcharging or fire, allowing exhaust materials such as flames and gases to be discharged from inside the case 20 to the outside.

[0059] Furthermore, an insulating member may be installed between the electrode assembly and the cap plate 31. Here, the insulating member may include first and second lower insulating members 60 and 70, and each of the first and second lower insulating members 60 and 70 can be installed between the electrode assembly and the cap plate 31.

[0060] Furthermore, according to this embodiment, one end of a separating member may be installed between the insulating member and the terminal 21 so as to face one side of the electrode assembly.

[0061] Here, the separating member may include the first and second separating members 80 and 90.

[0062] Therefore, one end of the first and second separating members 80 and 90, which can be installed between the first and second lower insulating members 60 and 70 and the positive and negative electrode terminals 21 and 22 so as to face one side of the electrode assembly, may be installed.

[0063] In other words, the terminals 21, which are welded to the positive and negative current collectors 40 and 50, can be connected to one end of the first and second lower insulating members 60 and 70 and the first and second separating members 80 and 90.

[0064] Figure 4 is an internal perspective view of the housing according to one embodiment of the present invention.

[0065] Figure 5 is a perspective view illustrating the inside of a battery module in which a fire extinguishing agent has been sprayed according to one embodiment of the present invention.

[0066] As shown in Figure 4, the battery module 1000 includes a flow path 300.

[0067] The flow path 300 is formed in the internal space of the housing 200. For example, the flow path 300 is formed in the internal space of the housing 200 along a first direction. The first direction includes, for example, the longitudinal direction (y-axis) of the battery module 1000.

[0068] For example, the flow path 300 may be formed in the form of a pipe connecting the end plates 210 formed on both sides. Alternatively, for example, the flow path 300 may be formed in the form of a pipe connecting the side plates 220 formed on both sides.

[0069] For example, multiple secondary batteries 100 can form a battery structure arranged in a first direction.

[0070] The battery module 1000 may include one or more battery structures. For example, if the battery module 1000 includes multiple battery structures, the multiple battery structures may be arranged in the width direction (x-axis) of the battery module 1000.

[0071] For the sake of clarity, this specification describes an example in which two battery structures are arranged in two columns. That is, the battery modules 1000 may be arranged to form two columns in the width direction (x-axis) and multiple rows in the length direction (y-axis).

[0072] For example, the multiple secondary batteries 100 include a battery structure in which multiple battery cells are arranged in a first direction. Alternatively, for example, the battery structure includes a first battery structure and a second battery structure arranged in two rows in the width direction of the battery module 1000.

[0073] The flow path 300 may be provided between the first battery structure and the second battery structure when viewed from above. In this case, the flow path 300 may be provided on the top of the secondary battery 100 or on the side of the secondary battery 100.

[0074] Although not shown in Figures 4 and 5, the flow path 300 may be connected to a fire extinguishing agent storage tank located outside the housing 200 via a flow path pipe exposed to the outside of the housing 200. The flow path 300 can be supplied with fire extinguishing agent 301 from the fire extinguishing agent storage tank.

[0075] The flow channel 300 may be formed of a heat-sensitive material that melts at a temperature above the first temperature.

[0076] In this case, the first temperature may be, for example, the ignition temperature of the secondary battery 100. The first temperature may be, for example, 100°C to 150°C. Or, for example, the first temperature may be 110°C to 150°C. Or, for example, the first temperature may be 100°C to 140°C. Or, for example, the first temperature may be 110°C to 140°C. Or, for example, the first temperature may be 110°C to 130°C.

[0077] If the first temperature is below 100°C, the flow path 300 may melt during the charging and discharging process of the secondary battery 100. In this case, the battery module 1000 may not function properly. Alternatively, if the first temperature exceeds 150°C, a fire may break out in the secondary battery 100, and after a while, the flow path 300 may melt. In this case, as the suppression of the fire F is delayed, the cooling effect of the battery module 1000 decreases. Therefore, the first temperature is preferably, for example, between 100°C and 150°C.

[0078] For example, the heat-sensitive material may include PA12 material. Alternatively, the heat-sensitive material may include HDPE, LLDPE, LDPE, ABS, AMSAN, etc. For example, the flow path 300 may be formed in the shape of a tube made of PA12 material.

[0079] The flow path 300 releases the fire extinguishing agent 301 that has melted at a temperature above the first temperature and is present within the flow path 300. In this case, since the flow path 300 is located in the internal space of the housing 200, the fire extinguishing agent 301 can be released into the internal space of the housing 200, for example, as in A.

[0080] However, the form and / or arrangement of the channel 300 according to one embodiment of the present invention is not limited thereto. For example, the channel 300 may be installed outside the housing 200 and capable of injecting the fire extinguishing agent 301 into the housing 200. In this case, the channel 300 can spray the fire extinguishing agent 301 into the housing 200 when the internal temperature of the housing 200 rises above a predetermined temperature. Thus, the channel 300 can be applied to the battery module 1000 in all forms and / or arrangements that enable the spraying of the fire extinguishing agent 301 into the internal space of the housing 200.

[0081] The fire extinguishing agent 301 may include, for example, a liquid fire extinguishing agent. For example, the fire extinguishing agent may include at least one of the following: sulfuric acid, potassium carbonate, sodium bicarbonate, aluminum sulfate, water, halons, halogen compounds, and combinations thereof.

[0082] Alternatively, the fire extinguishing agent 301 may include, for example, a gaseous fire extinguishing agent and / or a solid fire extinguishing agent. For example, the fire extinguishing agent may include at least one of Novec 1230, nitrogen, solid aerosol and combinations thereof.

[0083] This allows the fire extinguishing agent 301 to rise to a predetermined height h within the internal space of the housing 200. In this case, the predetermined height h is less than the height of the battery module 1000. Furthermore, the predetermined height h is less than the height H of the secondary battery 100 (see Figure 7). For example, the predetermined height h can be 1 / 3 of the height H of the secondary battery.

[0084] Thus, the flow path 300 can spray fire extinguishing agent 301 that fills only a portion of the battery module 1000. This is because the amount of fire extinguishing agent 301 that can be installed in the battery module 1000 is limited. For example, the fire extinguishing agent 301 can only fill the lower part of the battery module 1000. In this case, the upper part of the secondary battery 100 will not be cooled, or will be cooled more slowly, than the lower part.

[0085] To solve these problems, a battery module 1000 according to one embodiment of the present invention includes a plurality of secondary batteries 100, a housing 200 that houses the plurality of secondary batteries 100, a flow path 300 that injects a fire extinguishing agent 301 into the internal space of the housing 200 at a temperature of 1 or higher, and a cooling sheet 400 located at least one of the plurality of secondary batteries 100 that absorbs the fire extinguishing agent 301.

[0086] The following provides a detailed description of this type of cooling sheet 400.

[0087] Figure 6 is a perspective view of a cooling sheet according to one embodiment of the present invention.

[0088] A cooling sheet 400 according to one embodiment of the present invention absorbs a fire extinguishing agent 301. For example, the cooling sheet 400 diffuses the fire extinguishing agent 301 absorbed through at least a portion of it throughout the sheet.

[0089] As illustrated with reference to Figure 5, the cooling sheet 400 may be located between at least one of the secondary batteries 100. One and / or both sides of the cooling sheet 400 face the long side of the secondary battery 100. Alternatively, one and / or both sides of the cooling sheet 400 are in surface contact with the long side of the secondary battery 100.

[0090] This allows the cooling sheet 400 to face or come into contact with the long side of the secondary battery 100. The cooling sheet 400 enables the fire extinguishing agent 301 to function over the entire or most of the long side of an adjacent secondary battery 100.

[0091] As explained with reference to Figures 4 and 5, the fire extinguishing agent 301 can only face a portion of the secondary battery 100. The cooling sheet 400 allows the fire extinguishing agent 301 to also face the top of the secondary battery 100. The cooling sheet 400 allows the fire extinguishing agent 301 to operate from the bottom to the top of the secondary battery 100. Through this, the cooling sheet 400 can improve the cooling efficiency of the secondary battery 100 and / or battery module 1000 with a small amount of fire extinguishing agent 301.

[0092] The cooling sheet 400 includes an absorbent layer 410.

[0093] The absorbent layer 410 may be formed in the shape of a sheet. Alternatively, the absorbent layer 410 may be formed in the shape of a thin plate.

[0094] The absorption layer 410 may be formed to correspond to the shape of the case 20 of the secondary battery 100. For example, if the secondary battery 100 is a prismatic secondary battery, the absorption layer 410 may be formed as a square-shaped sheet or plate. For example, if the secondary battery 100 is a cylindrical or coin-type secondary battery, the absorption layer 410 may be formed as a holder shape into which a cylindrical battery can be inserted.

[0095] The shape of the absorbent layer 410 is not limited to this. Below, an example will be given in which the absorbent layer 410 is formed in the form of a rectangular sheet.

[0096] The absorbent layer 410 can absorb the fire extinguishing agent 301. For example, the absorbent layer 410 can absorb the fire extinguishing agent 301 sprayed from the flow path 300. For example, if the fire extinguishing agent 301 is a liquefied fire extinguishing agent, the absorbent layer 410 will absorb the fire extinguishing agent 301 partially or completely. If the absorbent layer 410 absorbs the fire extinguishing agent 301 partially, the absorbent layer 410 will diffuse the fire extinguishing agent 301 throughout the absorbent layer 410.

[0097] The absorbent layer 410 includes a hygroscopic material. The hygroscopic material includes a material capable of absorbing substances in a liquid state. However, the hygroscopic material intended herein includes a material capable of absorbing the fire extinguishing agent 301. This allows the hygroscopic material to absorb not only substances in a liquid state but also substances in a gaseous state.

[0098] The hygroscopic material may include, for example, at least one of super absorbent polymers (SAP), tissue paper, moisture absorbents, fibers, and combinations thereof. However, the hygroscopic material is not limited to these and includes all types of materials capable of absorbing the fire extinguishing agent 301 in liquid and / or gaseous state.

[0099] Furthermore, the fibers may include inorganic materials in fibrous form, metallic materials in fibrous form, absorbent fibers, glass fibers, etc.

[0100] For example, the fibrous inorganic material may include at least one or a mixture of at least two materials selected from the group consisting of glass wool, rock wool, glass fibers, rock cotton, gypsum fibers, silica fibers, alumina fibers, zirconia fibers, and carbon fibers.

[0101] For example, a fibrous metal material may include at least one or more mixtures selected from the group consisting of gold, silver, iron, steel, aluminum, beryllium, tungsten, molybdenum, and stainless steel, formed in a fibrous form.

[0102] For example, the absorbent fiber may include an absorbent resin containing at least one of starch-based materials, cellulose-based materials, and synthetic polymer-based materials.

[0103] For example, the absorbent layer 410 may further include a first heat insulating material mixed with a hygroscopic material. For example, the absorbent layer 410 includes a mixture and / or compound formed by adding a hygroscopic material to the first heat insulating material. For example, the absorbent layer 410 may be formed with a weight ratio of 1-100%:99-0% between the hygroscopic material and the first heat insulating material. For example, the absorbent layer 410 may be formed by adding an aerogel as the first heat insulating material to a porous nonwoven fabric structure as the hygroscopic material.

[0104] Alternatively, for example, the absorbent layer 410 may further include a first thermal insulation material coated with a hygroscopic material on at least a portion of its outer surface. For example, the absorbent layer 410 may be formed by coating one or both sides of the first thermal insulation material with a hygroscopic material. Alternatively, for example, the absorbent layer 410 may include a first layer containing the first thermal insulation material and a second layer containing a hygroscopic material provided on one or both sides of the first thermal insulation material.

[0105] In this case, the first heat insulating material ensures that the absorption layer 410 has heat insulating properties. For example, the absorption layer 410 allows the cooling sheet 400 to suppress heat diffusion from one secondary battery 100 to another secondary battery 100 adjacent to that secondary battery 100 via the first heat insulating material.

[0106] For example, the first thermal insulation material may be at least one selected from the group consisting of aerogel, wet silica, dry silica, polyurethane, polystyrene, polyethylene, polyester, and combinations thereof.

[0107] For example, the absorption layer 410 may be formed to cover 30% to 110% of the area of ​​the long side surface of the secondary battery 100 (including, for example, the first and second sides described in relation to Figures 4 and 5). If the area of ​​the absorption layer 410 is less than 30% of the area of ​​the long side surface of the secondary battery 100, even if the absorption layer 410 absorbs the fire extinguishing agent 301, it may not adequately provide the secondary battery 100 with sufficient cooling performance for the fire extinguishing agent 301. Also, if the area of ​​the absorption layer 410 is more than 110% of the area of ​​the long side surface of the secondary battery 100, the absorption layer 410 may reduce the capacity of the battery module 1000. Therefore, it is preferable that the area of ​​the absorption layer 410 be formed to cover 30% to 110% of the area of ​​the long side surface of the secondary battery 100.

[0108] For example, the absorption layer 410 may have an area corresponding to the long side surface of the secondary battery 100. Through this, the absorption layer 410 can maximize the cooling effect and / or flame spread suppression effect.

[0109] Through this, the cooling sheet 400 according to one embodiment of the present invention can absorb the fire extinguishing agent 301 and effectively prevent thermal runaway.

[0110] Figure 7 is a schematic diagram illustrating the operation process of a cooling sheet according to one embodiment of the present invention.

[0111] As explained with reference to Figure 6, the cooling sheet 400 according to one embodiment of the present invention can absorb the fire extinguishing agent 301. The cooling sheet 400 may also include an absorbent layer 410 that can absorb the fire extinguishing agent 301.

[0112] As described with reference to Figures 1 to 6, the battery module 1000 includes a plurality of secondary batteries 100, a channel 300 for spraying a fire extinguishing agent 301, and a cooling sheet 400 located between all or at least one of the secondary batteries 100. The cooling sheet 400 may face and / or be in surface contact with the long sides of the secondary batteries 100.

[0113] Figure 7 shows the state in which the fire extinguishing agent 301 is sprayed from the flow path 300 into the internal space of the housing 200.

[0114] As shown in Figure 7, for example, the fire extinguishing agent 301 may be sprayed so as to immerse the lower part of the secondary battery 100. The fire extinguishing agent 301 can form a height h in the internal space of the housing 200.

[0115] In this case, the fire extinguishing agent 301 may be sprayed together with the secondary battery 100 so that the lower part of the cooling sheet 400 is submerged. As a result, the lower part of the cooling sheet 400 is wet or submerged by the fire extinguishing agent 301.

[0116] The cooling sheet 400 can absorb the fire extinguishing agent 301 through the absorbent layer 410. This allows the fire extinguishing agent 301 to penetrate into the interior of the cooling sheet 400. The absorbent layer 410 diffuses the fire extinguishing agent 301 into the interior of the cooling sheet 400. This allows the fire extinguishing agent 301 to diffuse from the bottom to the top of the cooling sheet 400 along direction B. For example, the fire extinguishing agent 301 can be diffused by the cooling sheet 400 up to a height H.

[0117] In this case, H represents the height of the cooling sheet 400. If the height of the cooling sheet 400 and the height of the secondary battery 100 are the same, H can also represent the height of the secondary battery 100. In this way, the cooling sheet 400 can absorb and diffuse the fire extinguishing agent 301, which has been moistened only up to the height of h, and position it up to the height of H.

[0118] Even though only a small amount of the fire extinguishing agent 301 is sprayed into the internal space of the housing 200, it can quickly provide a cooling effect to the entire secondary battery 100. As a result, the battery module 1000 according to one embodiment of the present invention can provide a solution that can improve cooling efficiency and, consequently, effectively reduce thermal runaway.

[0119] Figure 8 is a perspective view of a cooling sheet according to one embodiment of the present invention.

[0120] A cooling sheet 400 according to one embodiment of the present invention absorbs the fire extinguishing agent 301. For example, the cooling sheet 400 diffuses the fire extinguishing agent 301 absorbed at least partially throughout the sheet. In this case, as described with reference to Figures 6 and 7, the cooling sheet 400 may include an absorbent layer 410.

[0121] The absorption layer 410 may be sandwiched between multiple secondary batteries 100 and provided inside the battery module 1000. Alternatively, the absorption layer 410 may be attached to the long side of at least one of the multiple secondary batteries 100 and provided inside the battery module 1000.

[0122] Figure 8 illustrates a method for fixing such an absorption layer 410 to the secondary battery 100, in addition to the method described above.

[0123] The cooling sheet 400 may further include a support base 420.

[0124] The support base 420 can fix and position the cooling sheet 400 relative to the adjacent secondary battery 100. Alternatively, the support base 420 can maintain an appropriate gap between the secondary batteries 100. If the gap between the secondary batteries 100 is not maintained, a short circuit may occur between the secondary batteries 100, and / or thermal runaway may occur rapidly in the event of thermal runaway.

[0125] Furthermore, the support base 420 can protect the absorption layer 410. In addition, the support base 420 allows the absorption layer 410 to quickly absorb the fire extinguishing agent 301 when it is sprayed.

[0126] For this purpose, the support base 420 may be formed while enclosing at least a portion of the outer casing of the absorption layer 410. In this way, the support base 420 can be positioned between the secondary batteries 100 while the absorption layer 410 maintains its appearance, by enclosing the outer casing of the absorption layer 410.

[0127] Furthermore, the support base 420 can provide a path for the absorption layer 410 to absorb the fire extinguishing agent 301 when the absorption layer 410 absorbs the fire extinguishing agent 301. For this purpose, at least a portion of the support base 420 is opened at a temperature of 2 or higher, allowing the absorption layer 410 to be exposed.

[0128] The structure and / or operation of such a support base 420 will be described in detail below.

[0129] For example, the support base 420 may include at least one of the lower support base 421, the side support base 422, and the upper support base 423.

[0130] The upper support base 423 is formed while enclosing at least a portion of the upper outer casing of the absorbent layer 410. The upper part of the absorbent layer 410 corresponds to the upper part of the secondary battery 100. For example, when the fire extinguishing agent 301 is sprayed into the internal space of the housing 200 and the secondary battery 100 and / or cooling sheet 400 are impregnated, the upper part of the absorbent layer 410 may not be impregnated. The upper support base 423 can support at least a portion of the upper outer casing of such an absorbent layer 410.

[0131] The lower support base 421 is formed to enclose at least a portion of the lower outer casing of the absorbent layer 410. The lower part of the absorbent layer 410 corresponds to the upper part of the secondary battery 100. For example, when the fire extinguishing agent 301 is sprayed into the internal space of the housing 200 and the secondary battery 100 and / or cooling sheet 400 are impregnated, the lower part of the absorbent layer 410 may be impregnated. The lower support base 421 can support at least a portion of the lower outer casing of such an absorbent layer 410. The lower support base 421 may also be positioned opposite the upper support base 423.

[0132] The side support base 422 is formed to enclose at least a portion of the side outer casing of the absorbent layer 410. The side of the absorbent layer 410 corresponds to the side of the secondary battery 100. For example, when the fire extinguishing agent 301 is sprayed into the internal space of the housing 200 and the secondary battery 100 and / or the cooling sheet 400 are impregnated, at least a portion of the side of the absorbent layer 410 may be impregnated. The side support base 422 can support at least a portion of the side outer casing of such an absorbent layer 410. The side support base 422 can also connect the lower support base 421 and the upper support base 423. The side support base 422 may also include a pair of side support bases 422a and 422b. If the side support base 422 includes the entire pair of side support bases 422a and 422b, the pair of side support bases 422a and 422b are formed facing each other. The pair of side support bases 422a and 422b can, respectively, connect one side of the lower support base 421 to one side of the upper support base 423, or connect the other side of the lower support base 421 to the other side of the upper support base 423.

[0133] For example, the support base 420 may include only one of the lower support base 421, the side support base 422, and the upper support base 423. Or, for example, the support base 420 may include the lower support base 421 and the side support base 422. Or, for example, the support base 420 may include the lower support base 421 and the upper support base 423. Or, for example, the support base 420 may include the side support base 422 and the upper support base 423. Or, for example, the support base 420 may include all of the lower support base 421, the side support base 422, and the upper support base 423.

[0134] In this case, the support base 420 may be formed with the same or similar thickness as the absorption layer 410. For example, the support base 420 may be formed with a thickness of 80% to 150% of the thickness of the absorption layer 410. Alternatively, for example, the support base 420 may be formed with a thickness of 80% to 145% of the thickness of the absorption layer 410. Alternatively, for example, the support base 420 may be formed with a thickness of 85% to 140% of the thickness of the absorption layer 410. Alternatively, for example, the support base 420 may be formed with a thickness of 90% to 135% of the thickness of the absorption layer 410. Alternatively, for example, the support base 420 may be formed with a thickness of 90% to 130% of the thickness of the absorption layer 410. Alternatively, for example, the support base 420 may be formed with a thickness of 95% to 125% of the thickness of the absorption layer 410. If the support base 420 is formed to a thickness of less than 80% of the absorption layer 410, the support base 420 may have insufficient force in supporting the shape of the absorption layer 410. Also, if the support base 420 is formed to a thickness exceeding 150% of the absorption layer 410, the support base 420 may reduce the capacity of the battery module 1000. Therefore, it is preferable that the support base 420 be formed to a thickness of 80% to 150% of the absorption layer 410.

[0135] In this way, the support base 420 supports the absorption layer 410 while enclosing at least a portion of the outer casing of the absorption layer 410.

[0136] Furthermore, if the fire extinguishing agent 301 is sprayed into the housing 200, the support base 420 may obstruct the path for the absorption layer 410 to absorb the fire extinguishing agent 301. Therefore, when the fire extinguishing agent 301 is sprayed into the housing 200, at least a portion of the support base 420 is opened, thereby exposing the outer casing of the absorption layer 410.

[0137] For example, the support base 420 may be open at the bottom so that the absorption layer 410 can more smoothly absorb the fire extinguishing agent 301 impregnated in the lower part of the secondary battery 100 and / or cooling sheet 400. For example, the support base 420 may have an open lower support base 421. Or, for example, the support base 420 may have an open lower support base 421 and / or a side support base 422. By extension, the support base 420 may also have an open upper support base 423.

[0138] Through this, the support base 420 allows the absorbent layer 410 to absorb the fire extinguishing agent 301 not only on its surface but also through its outer casing. This further improves the cooling efficiency of the cooling sheet 400.

[0139] For example, the support base 420 may further include a fixing portion 424 for fixing the cooling sheet 400 to the secondary battery 100.

[0140] The fixing portion 424 may be formed, for example, extending from the support base 420 in a direction perpendicular to the plane of the cooling sheet 400 (e.g., in the y-axis direction). Figure 8 shows an example in which the fixing portion 424 is formed extending perpendicularly from the side support base 422. However, the fixing portion 424 may also be formed extending from the lower support base 421 and / or the upper support base 423. In fact, the fixing portion 424 may be formed extending from all of the lower support base 421, the side support base 422 and the upper support base 423.

[0141] The fixing portion 424 may extend from the support base 420 in a linear, planar, or combination thereof. Alternatively, the fixing portion 424 may have a fastening portion or a hook that can be coupled to the secondary battery 100 from the support base 420.

[0142] Through this, the fixing part 424 secures the cooling sheet 400 to the side of the secondary battery 100. The fixing part 424 can also help to keep adjacent secondary batteries 100 aligned or not flowing.

[0143] Figure 9 is a perspective view of a cooling sheet according to one embodiment of the present invention.

[0144] Figure 9 shows an example of the cooling sheet 400 described in Figure 8 being opened.

[0145] As explained with reference to Figure 8, the cooling sheet 400 may include an absorption layer 410 and a support base 420. The support base 420 may melt and become exposed at least partially at a second temperature or higher.

[0146] For example, the support base 420 may melt and open up at least a portion of it at a second temperature or higher. For example, the support base 420 may melt at least a portion of the lower support base 421. For example, the lower support base 421 may melt and open up at least a portion of it at a second temperature or higher. and / or, for example, the support base 420 may melt at least a portion of the side support base 422. For example, the side support base 422 may melt and open up at least a portion of it at a second temperature or higher. and / or, for example, the support base 420 may melt at least a portion of the upper support base 423. For example, the upper support base 423 may melt and open up at least a portion of it at a second temperature or higher.

[0147] Figure 9 shows an example in which a portion of the lower support base 421 and the side support base 422 have melted, and a portion of the outer casing of the absorption layer 410 has been exposed.

[0148] In this case, the second temperature may be equal to or higher than the first temperature. If the second temperature is lower than the first temperature, a fire may not occur, and / or the support base 420 may melt due to the heat generated during the charging and discharging process of the secondary battery 100. In this case, the support base 420 may not support the cooling sheet 400, or it may interfere with the charging and discharging of the secondary battery 100. Therefore, it is preferable that the second temperature is equal to or higher than the first temperature. For example, the second temperature may be between 150°C and 700°C. Through this, the support base 420 may be opened after the fire extinguishing agent 301 has been sprayed.

[0149] The support base 420 may have a softening temperature of 100°C or higher. Naturally, it is formed at a softening temperature lower than the second temperature. Through this, the support base 420 is ready to open when the temperature of the battery module 1000 rises. In this case, the support base 420 can maintain its shape without melting if the temperature of the secondary battery 100 does not rise further. In this case, if the temperature of the secondary battery 100 rises further than the softening temperature and reaches the second temperature, the support base 420 can open the outer casing of the absorption layer 410 without maintaining its shape.

[0150] The support base 420 may have a flame retardancy rating of V0 or higher. Through this, the support base 420 can contribute to preventing heat transfer when heat is generated or the temperature rises.

[0151] The support base 420 may include, for example, PC, PET, HDPE, PP, LLDPE, PP-HOMO, PP-Copolymer, AMSAN, etc. However, the materials included in the support base 420 are not limited to these, and the support base 420 may include any material that melts at a second temperature or higher and has a softening temperature of 100°C or higher.

[0152] The support base 420 may be formed, for example, by injection molding, but the manufacturing process for the support base 420 is not limited to this.

[0153] Figure 10 is a diagram illustrating the operational process of a cooling sheet according to one embodiment of the present invention.

[0154] As described with reference to Figures 6 to 9, the cooling sheet 400 according to one embodiment of the present invention can absorb the fire extinguishing agent 301. The cooling sheet 400 may also include an absorbent layer 410 and a support base 420 that can absorb the fire extinguishing agent 301.

[0155] Figure 10 shows the state in which the fire extinguishing agent 301 is sprayed from the flow path 300 into the internal space of the housing 200.

[0156] As shown in Figure 10, for example, the fire extinguishing agent 301 may be sprayed so as to impregnate the lower part of the secondary battery 100. The fire extinguishing agent 301 can form a height h in the internal space of the housing 200.

[0157] In this case, the fire extinguishing agent 301 may be sprayed together with the secondary battery 100 so that the lower part of the cooling sheet 400 is submerged. As a result, the lower part of the cooling sheet 400 is wet or submerged by the fire extinguishing agent 301.

[0158] The support base 420 may be open in at least part. For example, the support base 420 may be open by melting in at least part. For example, the support base 420 may be open by melting in part of its lower and / or side, as shown in Figure 10. This may expose the outer casing of the absorption layer 410.

[0159] The cooling sheet 400 can absorb the fire extinguishing agent 301 through the absorbent layer 410. For example, the absorbent layer 410 can absorb the fire extinguishing agent 301 through at least a portion of the outer casing and / or at least a portion of the surface.

[0160] The fire extinguishing agent 301 penetrates into the interior of the cooling sheet 400. The absorbent layer 410 diffuses the fire extinguishing agent 301 into the interior of the cooling sheet 400. The fire extinguishing agent 301 can diffuse from the bottom to the top of the cooling sheet 400 along direction B. For example, the fire extinguishing agent 301 can move up to a height H by the cooling sheet 400.

[0161] In this case, H represents the height of the cooling sheet 400. If the height of the cooling sheet 400 and the height of the secondary battery 100 are the same, H can also represent the height of the secondary battery 100. In this way, the cooling sheet 400 can absorb and diffuse the fire extinguishing agent 301 that has only wetted up to a certain height (for example, the height of h) of the secondary battery 100, thereby positioning the fire extinguishing agent 301 up to the height of H.

[0162] Even though only a small amount of the fire extinguishing agent 301 is sprayed into the internal space of the housing 200, it can quickly provide a cooling effect to the entire secondary battery 100. As a result, the battery module 1000 according to one embodiment of the present invention can provide a solution that improves cooling efficiency and, consequently, effectively reduces thermal runaway of the battery module 1000.

[0163] Figure 11 is a perspective view of a cooling sheet according to one embodiment of the present invention.

[0164] Figure 12 is a side view of a cooling sheet according to one embodiment of the present invention.

[0165] A cooling sheet 400 according to one embodiment of the present invention absorbs a fire extinguishing agent 301. For example, the cooling sheet 400 diffuses the fire extinguishing agent 301 absorbed through at least a portion of it throughout the sheet.

[0166] In this case, as explained with reference to Figures 6 and 7, the cooling sheet 400 may include an absorption layer 410. Alternatively, as explained with reference to Figures 6 to 9, the cooling sheet 400 may include an absorption layer 410 and a support base 420.

[0167] The support base 420 is provided on the outer casing of the absorption layer 410, preventing exposure of the outer casing of the absorption layer 410 and / or contributing to maintaining the distance between the secondary batteries 100.

[0168] Furthermore, the cooling sheet 400 may further include a support insulation layer 430.

[0169] As shown in Figure 12, the support insulation layer 430 is placed on at least one surface of the absorption layer 410. For example, the support insulation layer 430 may be placed on one surface of the absorption layer 410, or on both surfaces. When the support insulation layer 430 is placed on both surfaces of the absorption layer 410, a pair of support insulation layers 431 and 432 may be provided facing each other with the absorption layer 410 in between.

[0170] For example, the support insulation layer 430 may be formed in the same or similar shape as the absorption layer 410. For example, if the absorption layer 410 is formed as a rectangular sheet, the support insulation layer 430 may also be formed as a rectangular sheet. Each support insulation layer 430 may be formed to a thickness of 5% to 30% of the thickness of the absorption layer 410.

[0171] The support insulation layer 430 is the base material for the cooling sheet 400. For example, the support insulation layer 430 allows the cooling sheet 400 to maintain its sheet shape. In addition, the support insulation layer 430 can further act as a barrier to block heat diffusion.

[0172] In this case, given the characteristics of the cooling sheet 400, it is preferable that the components included in the cooling sheet 400 do not deform due to heat and / or damage the surrounding secondary battery 100 due to heat. Therefore, the cooling sheet 400 is required to have insulating and / or heat-resistant properties while maintaining its shape.

[0173] For example, the supporting insulation layer 430 includes a second insulating material. The second insulating material may include an insulating material that maintains its shape while also having insulating and / or heat-resistant properties.

[0174] For example, the second insulating material may be at least one selected from the group consisting of mica, sericite, talc, diatomaceous earth, bentonite, silicon, maifan stone, kaolin, polyimide, and polyethylene terephthalate, or a mixture of at least two or more.

[0175] However, the second insulating material is not limited to this, and the second insulating material includes insulating material and includes all or part of a material that can support the shape of the absorption layer 410.

[0176] Through this structure, the cooling sheet 400 can further improve its heat insulation and more effectively prevent thermal runaway.

[0177] Figure 13 is a perspective view of a cooling sheet according to one embodiment of the present invention.

[0178] Figure 13 shows the cooling sheet 400 described in Figures 11 and 12 with at least a portion of it open.

[0179] As described with reference to Figures 11 and 12, the cooling sheet 400 may include an absorption layer 410, a support base 420, and a support insulation layer 430. The support base 420 may be partially melted and exposed at a temperature of 2 or higher. The description of the support base 420 is the same as or similar to that described in Figures 8 and 9.

[0180] For example, the support base 420 may melt and open up at least a portion of it at a second temperature or higher. For example, the support base 420 may melt at least a portion of the lower support base 421. For example, the lower support base 421 may melt and open up at least a portion of it at a second temperature or higher. and / or, for example, the support base 420 may melt at least a portion of the side support base 422. For example, the side support base 422 may melt and open up at least a portion of it at a second temperature or higher. and / or, for example, the support base 420 may melt at least a portion of the upper support base 423. For example, the upper support base 423 may melt and open up at least a portion of it at a second temperature or higher.

[0181] Figure 9 shows an example in which a portion of the lower support base 421 and the side support base 422 have melted, and a portion of the outer casing of the absorption layer 410 has been exposed.

[0182] In this way, the support base 420 is opened at least partially when the temperature is above the second temperature, thereby providing a path through which the absorption layer 410 can absorb the fire extinguishing agent 301 via the outer casing.

[0183] Figure 14 is a schematic diagram illustrating the operation process of a cooling sheet according to one embodiment of the present invention.

[0184] As explained with reference to Figures 6 to 13, the cooling sheet 400 according to one embodiment of the present invention can absorb the fire extinguishing agent 301.

[0185] The cooling sheet 400 may include an absorbent layer 410 and a support insulation layer 430 that can absorb the fire extinguishing agent 301. Alternatively, the cooling sheet 400 may include an absorbent layer 410, a support base 420, and a support insulation layer 430.

[0186] Figure 14 shows the state in which the fire extinguishing agent 301 is sprayed from the flow path 300 into the internal space of the housing 200.

[0187] As shown in Figure 14, for example, the fire extinguishing agent 301 may be sprayed so as to impregnate the lower part of the secondary battery 100. The fire extinguishing agent 301 can form a height h in the internal space of the housing 200.

[0188] In this case, the fire extinguishing agent 301 may be sprayed together with the secondary battery 100 so that the lower part of the cooling sheet 400 is submerged. The lower part of the cooling sheet 400 is wet or submerged by the fire extinguishing agent 301.

[0189] The support base 420 may be open in at least part. For example, the support base 420 may be open by melting in at least part. For example, the support base 420 may be open by melting in part of its lower and / or side, as shown in Figure 14. This may expose the outer casing of the absorption layer 410.

[0190] The cooling sheet 400 can absorb the fire extinguishing agent 301 through the absorbent layer 410. For example, the absorbent layer 410 can absorb the fire extinguishing agent 301 through at least a portion of its outer casing.

[0191] The fire extinguishing agent 301 penetrates into the interior of the cooling sheet 400. The absorbent layer 410 diffuses the fire extinguishing agent 301 into the interior of the cooling sheet 400. The fire extinguishing agent 301 can diffuse from the bottom to the top of the cooling sheet 400 along direction B. For example, the fire extinguishing agent 301 can move up to a height H by the cooling sheet 400.

[0192] In this case, H represents the height of the cooling sheet 400. If the height of the cooling sheet 400 and the height of the secondary battery 100 are the same, H can also represent the height of the secondary battery 100. In this way, the cooling sheet 400 can absorb and diffuse the fire extinguishing agent 301 that has only wetted up to a certain height (for example, the height of h) of the secondary battery 100, thereby positioning the fire extinguishing agent 301 up to the height of H.

[0193] Even though only a small amount of the fire extinguishing agent 301 is sprayed into the internal space of the housing 200, it can quickly provide a cooling effect to the entire secondary battery 100.

[0194] As a result, the battery module 1000 according to one embodiment of the present invention can provide a solution that improves cooling efficiency and, consequently, effectively reduces thermal runaway of the battery module 1000.

[0195] Thus, the battery module 1000 according to one embodiment of the present invention can provide a method for efficiently cooling the battery module 1000 via a relatively small amount of fire extinguishing agent 301, even when the temperature of the secondary battery 100 and / or the battery module 1000 rises. Furthermore, the battery module 1000 can reduce the possibility of thermal runaway through the cooling sheet 400.

[0196] Although not shown in the diagram, the battery module 1000 may include all of the cooling sheets 400 and the heat insulating sheets. For example, the battery module 1000 may include cooling sheets 400 and heat insulating sheets that are alternately positioned between the secondary batteries 100. Alternatively, the battery module 1000 may include cooling sheets 400 and heat insulating sheets that are randomly distributed between multiple secondary batteries 100.

[0197] In this case, the insulation sheet may be formed of a single layer comprising a first insulating material, a second insulating material, and / or a combination thereof. Alternatively, the insulation sheet may comprise a first layer comprising the first insulating material and a second layer comprising the second insulating material. In this case, the insulation sheet may be formed by laminating the first and second layers. Alternatively, the insulation sheet may be formed by alternately laminating one or more first layers and one or more second layers.

[0198] The present invention has been described with reference to embodiments shown in the drawings, which are illustrative only, and any person with ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

[0199] Therefore, the scope of technical protection of the present invention should be defined by the claims. [Explanation of Symbols]

[0200] 100 Secondary battery 200 Housing 300 channels 400 Cooling Sheets

Claims

1. Multiple rechargeable batteries, A housing for housing the aforementioned multiple secondary batteries, A flow path for injecting a fire extinguishing agent into the internal space of the housing at a temperature of 1 or higher, A battery module comprising a cooling sheet located at least one among the plurality of secondary batteries and absorbing the fire extinguishing agent.

2. The battery module according to claim 1, wherein the cooling sheet diffuses the fire extinguishing agent absorbed through at least a portion of it throughout the entire cooling sheet.

3. The battery module according to claim 1, wherein the cooling sheet includes an absorbent layer containing a hygroscopic material.

4. The battery module according to claim 3, wherein the moisture-absorbing material includes at least one of a superabsorbent resin, tissue paper, a moisture absorbent, and absorbent fibers.

5. The battery module according to claim 3, wherein the absorption layer further comprises a first heat insulating material mixed with the hygroscopic material.

6. The battery module according to claim 3, wherein the absorption layer further comprises a first heat insulating material having at least a portion of its outer surface coated with the hygroscopic material.

7. The battery module according to claim 5 or 6, wherein the first heat insulating material is at least one selected from the group consisting of aerogel, wet silica, dry silica, polyurethane, polystyrene, polyethylene, polyester, and combinations thereof.

8. The battery module according to claim 3, wherein the cooling sheet is formed to enclose at least a portion of the outer casing of the absorption layer, and further includes a support base that is opened at least a portion at a second temperature or higher to expose the absorption layer.

9. The battery module according to claim 8, wherein the support base melts and opens at least a portion of it at the second temperature or higher.

10. The aforementioned support base is An upper support base enclosing the upper outer portion of the absorption layer, A lower support base enclosing the lower outer portion of the absorption layer, The battery module according to claim 8, comprising at least one of the following: a side support base enclosing the side outer casing of the absorption layer.

11. The battery module according to claim 10, wherein the lower support base melts and opens at least a portion of it at the second temperature or higher.

12. The battery module according to claim 8, wherein the second temperature is 150°C or more and less than 700°C.

13. The battery module according to claim 8, wherein the support base has a softening temperature of 100°C or higher.

14. The battery module according to claim 8, wherein the support base has a flame retardancy rating of V0 or higher.

15. The battery module according to claim 8, wherein the support base further includes a fixing portion for fixing the cooling sheet to the secondary battery.

16. The battery module according to claim 2, wherein the cooling sheet is disposed on at least one surface of the absorption layer and further comprises a support insulation layer containing a second heat insulating material.

17. The battery module according to claim 16, wherein the second heat insulating material comprises at least one selected from the group consisting of mica, sericite, talc, diatomaceous earth, bentonite, silicon, maifan stone, kaolin, polyimide, and polyethylene terephthalate, or a mixture of at least two or more.

18. The battery module according to claim 1, wherein the flow path includes a heat-sensitive material that melts at a first temperature or higher.

19. The battery module according to claim 1, wherein the fire extinguishing agent includes a liquid or gaseous fire extinguishing agent.

20. The battery module according to claim 1, wherein the first temperature is 100°C or more and less than 150°C.

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