Battery module

Abstract

A battery module is provided. The battery module includes a plurality of battery cells, a case accommodating the plurality of battery cells, and an exhaust portion disposed in a portion of the case, wherein the exhaust portion includes an outer funnel disposed through the case, an inner surface of the outer funnel defines an exhaust hole penetrating the case, and a diameter of the exhaust hole increases toward an outside of the battery module.

Description

Technical Field

[0001] One or more implementations relate to battery modules. Background Technology

[0002] Secondary batteries are designed to be charged and discharged, unlike primary batteries which are not designed to be charged. Low-capacity secondary batteries are used in portable small 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 vehicles, electric vehicles, etc., and as batteries for energy storage. Such secondary batteries include electrode assemblies with positive and negative electrodes, a casing housing the electrode assemblies, and electrode terminals connected to the electrode assemblies.

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

[0004] The implementation method involves a battery module with fire extinguishing capabilities.

[0005] However, the technical problems to be solved by this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the following description of this disclosure other problems not mentioned.

[0006] According to an embodiment, a battery module includes: a plurality of battery cells; a housing for accommodating the plurality of battery cells; and an exhaust portion disposed in a portion of the housing, wherein the exhaust portion includes an outer funnel disposed through the housing, the inner surface of the outer funnel defining an exhaust port penetrating the housing, the diameter of the exhaust port increasing toward the outside of the battery module.

[0007] In one embodiment, the venting section may further include an inner funnel located at the center of the outer funnel and a connecting portion that connects the inner funnel and the outer funnel to each other.

[0008] In one implementation, the distance between the outer funnel and the inner funnel can be increased toward the outside of the battery module.

[0009] In one embodiment, the thickness of the inner funnel, measured in the direction from the inside to the outside of the shell, can be less than the thickness of the outer funnel.

[0010] In one embodiment, the inner funnel may include an opening formed through the inner funnel in the thickness direction.

[0011] In one implementation, the diameter of the opening can be increased toward the outside of the battery module.

[0012] In one embodiment, the exhaust portion may include a mesh portion arranged in a direction substantially perpendicular to the extension direction of the exhaust port to block the exhaust port.

[0013] In an implementation, the mesh portion may have a mesh size in the range of 1 mm to 10 mm.

[0014] In one embodiment, the venting section may further include an inner funnel located at the center of the outer funnel, the inner funnel being spaced apart from the mesh portion and being positioned closer to the outside of the battery module than the mesh portion.

[0015] In one embodiment, the outer funnel may further include a cooling section surrounding the vent.

[0016] According to one or more embodiments, a battery module includes: a plurality of battery cells; a housing for accommodating the plurality of battery cells; and an exhaust portion disposed in a portion of the housing, wherein the exhaust portion includes an outer funnel, an inner funnel, and a connecting portion, the outer funnel having an inner surface defining an exhaust port penetrating the housing, the inner funnel being located at the center of the outer funnel, the connecting portion connecting the inner funnel and the outer funnel to each other, and the gap between the outer funnel and the inner funnel increasing toward the outside of the battery module.

[0017] In one implementation, the diameter of the vent can be increased toward the outside of the battery module.

[0018] In one embodiment, the thickness of the inner funnel, measured in the direction from the inside to the outside of the shell, can be less than the thickness of the outer funnel.

[0019] In one embodiment, the inner funnel may include an opening formed through the inner funnel in the thickness direction.

[0020] In one implementation, the diameter of the opening can be increased toward the outside of the battery module.

[0021] In one embodiment, the exhaust portion may include a mesh portion arranged in a direction substantially perpendicular to the extension direction of the exhaust port to block the exhaust port.

[0022] In an implementation, the mesh portion may have a mesh size in the range of 1 mm to 10 mm.

[0023] In one implementation, the inner funnel can be spaced apart from the mesh portion and can be positioned closer to the outside of the battery module than the mesh portion.

[0024] In one embodiment, the outer funnel may further include a cooling section surrounding the vent.

[0025] In an embodiment, the slope of the straight line connecting the outer funnel to the opposite ends in the thickness direction of the shell can be in the range of 30° to 60°.

[0026] In one embodiment, a method of manufacturing a battery module includes: providing a plurality of battery cells; providing a housing for accommodating the plurality of battery cells; and providing an exhaust portion disposed in a portion of the housing, wherein the exhaust portion includes an outer funnel disposed through the housing, the inner surface of the outer funnel defining an exhaust port penetrating the housing, the diameter of the exhaust port increasing toward the outside of the battery module. Attached Figure Description

[0027] The following accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the detailed description of the present disclosure herein, serve to further describe the technical concept of the present disclosure; therefore, the present disclosure should not be construed as limited to the matters described in the drawings:

[0028] Figure 1 This is a schematic perspective view of a battery module according to an embodiment;

[0029] Figure 2 yes Figure 1 A schematic perspective view of the implementation of the battery cells of the battery module;

[0030] Figure 3 It is along Figure 2 A cross-sectional view taken from line I-I';

[0031] Figure 4 yes Figure 1 A schematic plan view of an embodiment of the exhaust section;

[0032] Figure 5 It is along Figure 4 A cross-sectional view taken from line II-II';

[0033] Figure 6 yes Figure 1 A schematic plan view of another embodiment of the exhaust section;

[0034] Figure 7 It is along Figure 6 A cross-sectional view taken from line III-III';

[0035] Figure 8 yes Figure 1 A schematic plan view of another embodiment of the exhaust section;

[0036] Figure 9 It is along Figure 8 A cross-sectional view taken from line IV-IV';

[0037] Figure 10 yes Figure 1 A schematic plan view of another embodiment of the exhaust section;

[0038] Figure 11 It is along Figure 10 A cross-sectional view taken from line V-V';

[0039] Figure 12 yes Figure 1 A schematic plan view of another embodiment of the exhaust section; and

[0040] Figure 13 It is along Figure 12 The cross-sectional view taken from line VI-VI'. Detailed Implementation

[0041] In the following, 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, but should be interpreted as conforming to the meaning and concept of the technical idea of ​​the present disclosure, based on the inventor's ability to appropriately define the concepts of the terms to best describe his or her own disclosure. Therefore, the embodiments described in this specification and the constructions shown in the drawings are only some of the most preferred embodiments of the present disclosure and do not represent all the technical ideas of the present disclosure, and it should be understood that various equivalents and modifications may exist to replace those embodiments at the time of filing this application.

[0042] As used herein, the terms “comprising or including” and / or “comprising or including” specify the presence of stated features, numbers, steps, operations, components, elements, and / or groups thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or groups thereof. In describing embodiments of this disclosure, the terms “may” and “may be” may include “embodiments of this disclosure”.

[0043] To aid in understanding this disclosure, the drawings are not to scale, but the dimensions of some components may be exaggerated. Furthermore, the same elements in different embodiments may be given the same reference numerals.

[0044] When interpreting two objects as "the same," it means that these objects are "substantially identical." Therefore, substantially equal can include situations where there is a deviation considered low in the art (e.g., a deviation within 5%). The uniformity of parameters over a given region can mean uniformity from an average perspective.

[0045] Although the terms first, second, etc., may be used here to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another, unless otherwise stated, in which case the first component may also be the second component.

[0046] Throughout this specification, unless otherwise stated, each component may be singular or plural.

[0047] The placement of any structure "above" (or below) a component or "on" (or below) a component can mean not only that any structure is placed in contact with the upper (or lower) surface of a component, but also that other structures can be inserted between the component and any structure placed on (or below) the component.

[0048] Furthermore, when a component is described as being “connected,” “joined,” or “fastened” to another component, these components may be directly connected to each other or be able to be connected to each other; however, it will also be understood that an additional component may be “inserted” between two components, or that two components may be “connected,” “joined,” or “fastened” by an additional component. When referring to one component being electrically joined to another component, this includes not only cases where they are directly connected, but also cases where they are connected by another element between them.

[0049] Whenever “A and / or B” is mentioned throughout the specification, unless otherwise stated, it means A, B, or A and B. That is, “and / or” includes all or any combination of the listed items. Unless otherwise stated, “C to D” means C or greater and D or less.

[0050] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0051] In the following description, embodiments will be described in detail with reference to the accompanying drawings. When embodiments are described with reference to the accompanying drawings, the same or corresponding elements are indicated by the same reference numerals.

[0052] Figure 1 This is a schematic perspective view of the battery module according to the embodiment. Figure 2 yes Figure 1 A schematic perspective view of the implementation of the battery cells of the battery module. Figure 3 It is along Figure 2 The cross-sectional view taken from line I-I'.

[0053] refer to Figures 1 to 3 The battery module 1 may include a plurality of battery cells 100, a housing 200 for accommodating the plurality of battery cells 100, a connecting piece 300 for electrically connecting the plurality of battery cells 100, and an exhaust portion 400 disposed on a portion of the housing 200.

[0054] Multiple battery cells 100 can be connected in series or in parallel to increase voltage and capacity. Multiple battery cells 100 can be arranged along a predetermined direction. The arranged multiple battery cells 100 can be fixed by a housing 200.

[0055] The housing 200 can accommodate multiple battery cells 100, and the multiple battery cells 100 can be arranged in one direction within the housing 200 (based on...). Figure 1 Arranged along the x-axis direction, such that the wide surfaces of adjacent battery cells 100 are opposite to each other.

[0056] The housing 200 may include a pair of end plates 210 opposite to the wide surface of the battery cell 100, a side plate 220 connecting the pair of end plates 210, a bottom plate (not shown), and a top plate 230. The side plate 220 may support the side surface of the battery cell 100, the bottom plate (not shown) may support the bottom surface of the battery cell 100, and the top plate 230 may support the top surface of the battery cell 100. The pair of end plates 210, the side plate 220, the bottom plate (not shown), and the top plate 230 may be connected by means such as bolts.

[0057] The connecting lug 300 can electrically connect multiple battery cells 100, and can connect adjacent battery cells 100 in series or parallel, for example. In some embodiments, the connecting lug 300 can be coupled to electrode terminals 155, which will be described later, to electrically connect adjacent battery cells 100. The connecting lug 300 can be a busbar.

[0058] The description here has been given as an example of a series connection, but the connection structure is not limited to a series structure, and various connection structures can be used as needed. The number and arrangement of the battery cells 100 are not limited to... Figure 1 The structure shown in the figure can be varied as needed.

[0059] The battery cell 100 may be a rechargeable and dischargeable battery, and may include an electrode assembly 110, a casing portion 130, a cover portion 150, and a safety vent 170.

[0060] The electrode assembly 110 according to an embodiment may include a positive electrode 111 and a negative electrode 113. In some embodiments, the electrode assembly 110 may be wound after a diaphragm 115, which serves as an insulator, is inserted between the positive electrode 111 and the negative electrode 113.

[0061] However, this disclosure is not limited thereto. The electrode assembly 110 described herein may be formed in a structure in which each of the plurality of positive electrodes 111 and negative electrodes 113 are alternately stacked with a diaphragm 115 placed between the positive electrodes 111 and the negative electrodes 113.

[0062] The description of an example of a lithium-ion battery cell having a square shape, wherein the battery cell 100 according to the embodiment will be given. However, this disclosure is not limited thereto and can be applied to various types of battery cells, such as lithium polymer battery cells or cylindrical battery cells.

[0063] The positive electrode 111 and the negative electrode 113 may include coated and uncoated portions (not shown in the figures) in a current collector formed of a thin metal foil. The coated portions may be coated with an active material, and the uncoated portions may not be coated with an active material.

[0064] The housing portion 130 can accommodate the electrode assembly 110, define the overall appearance of the battery cell 100, and may include a conductive metal, such as aluminum, aluminum alloy, or nickel-plated steel. For example, the housing portion 130 can provide space therein to accommodate the electrode assembly 110.

[0065] The shell portion 130 may include a shell body 131, which is formed to surround the internal electrode assembly 110. The shell body 131 according to this embodiment is shown as a cuboid shape with one side open, but it is not limited thereto and can be modified in various ways to be cylindrical, prismatic, etc.

[0066] According to the embodiment, the shell body 131 can be formed into a shape having an internal hollow space. The electrode assembly 110 and the electrolyte can be accommodated in the hollow space of the shell body 130.

[0067] An opening 131h can be formed in one surface of the housing body 131. The opening 131h can be formed by opening one surface of the housing body 131, and the electrode assembly 110 can be inserted into the housing body 131 through the opening 131h.

[0068] The cover portion 150 can be attached to the shell portion 130 while covering the opening 131h, and may include a conductive material.

[0069] According to the embodiment, the cover portion 150 may include a cover 151, which is an assembly that covers the opening 131h, and the cover 151 may be formed in the shape of a thin plate and welded to the opening 131h.

[0070] The cover 151 protects one surface of the battery cell 100, inhibits physical damage to the battery cell 100, and prevents substances outside the battery cell 100 from flowing into the casing portion 130. The electrolyte and electrode assembly 110 inside the casing portion 130 can be sealed to prevent leakage to the outside.

[0071] The cover plate 151 may include a mounting hole 152 and an injection hole 153. The interior and exterior of the shell portion 130 are in communication with each other through the mounting hole 152 and a safety vent 170 is installed in the mounting hole 152. Electrolytes are injected through the injection hole 153.

[0072] According to one embodiment, a mounting hole 152 may be formed through the cover plate 151. The mounting hole 152 may be the area where a safety vent 170, which will be described later, is installed.

[0073] Mounting hole 152 allows communication between the interior and exterior of cover plate 151. In some embodiments, mounting hole 152 may be a channel through which gases generated inside housing portion 130 can be discharged to the outside. Mounting hole 152 may also be a channel through which external air, gases, contaminants, etc., are introduced into housing portion 130.

[0074] Mounting hole 152 can be formed in the longitudinal direction (based on...) Figure 2 An elliptical shape extending along the y-axis. However, not limited to this, various modifications such as rectangular and circular shapes can also be implemented within the technical concept of forming and connecting the interior and exterior of the shell portion 130 through the mounting hole 152 passing through the cover plate 151.

[0075] According to the implementation method, the mounting hole 152 is in the width direction (based on...) Figure 2 The length in the x-axis direction can be greater than that of the cover plate 151 in the width direction (based on...). Figure 2 The length in the x-axis direction is short, and the length in the thickness direction (based on) is short. Figure 2 In the z-axis direction, the height of the mounting hole 152 can be the same as the height of the cover plate 151.

[0076] Mounting holes 152 may be formed in the central portion of the cover plate 151. For example, mounting holes 152 may be arranged between a plurality of electrode terminals 155a and 155b, which are arranged on opposite end portions of the cover plate 151. However, this is not a limitation; mounting holes 152 may also be arranged on the outside of the plurality of electrode terminals 155a and 155b, and in another example, they may be arranged offset to one side relative to the central portion of the cover plate 151.

[0077] According to an optional embodiment, the mounting holes 152 can be arranged as a plurality of mounting holes. The plurality of mounting holes 152 can be arranged along the longitudinal direction of the cover plate 151 (based on...). Figure 2 (in the y-axis direction). Therefore, the safety vent 170 installed in the mounting hole 152 can also be arranged as multiple safety vents.

[0078] An injection hole 153, formed in the shape of a hole, can be formed in the cover plate 151 to allow the injection of electrolyte. The injection hole 153 can serve as a channel through which the electrolyte can be replenished or replaced during maintenance of the battery cell 100.

[0079] According to an embodiment, an injection plug (not shown in the reference numerals) sealing the injection port 153 can be fitted into the injection port 153. The outer periphery of the region where the injection plug is fitted into the injection port 153 can be equal to the inner periphery of the injection port 153, so that the electrolyte can be sealed without leakage to the outside.

[0080] The injection plug according to the embodiment may include materials such as polyethylene, polypropylene, or silicone. Therefore, the sealing performance of the injection port 153 can be improved, and the reaction between the injection plug and the electrolyte inside the housing portion 130 can be prevented, thereby maintaining the stability of the battery cell 100.

[0081] The injection hole 153 can be arranged on one side of the mounting hole 152 and can be located between the multiple electrode terminals 155a and 155b. However, it is not limited to this and the injection hole 153 can be modified in various ways, such as being arranged outside the multiple electrode terminals 155a and 155b, being arranged away from the mounting hole 152, and so on.

[0082] Electrode terminal 155 can be electrically connected to positive electrode 111 or negative electrode 113, and can be mounted to protrude outward through cover plate 151. Electrode terminal 155 can be along the longitudinal direction of cover plate 151 (based on...). Figure 2 The electrode terminals 155 are arranged in the y-axis direction as a plurality of electrode terminals, and the plurality of electrode terminals 155 may include a positive electrode terminal 155a and a negative electrode terminal 155b.

[0083] For example, the outer peripheral surfaces of the upper posts protruding outside the cover plate 151 of the positive electrode terminal 155a and the negative electrode terminal 155b can be threaded and fixed to the cover plate 151 by means of nuts.

[0084] However, not limited thereto, the positive electrode terminal 155a and the negative electrode terminal 155b can be modified in various ways, for example, they can be formed as rivet structures to be riveted to the cover plate 151 or they can be welded to the cover plate 151.

[0085] The safety vent 170 can be the area that ruptures in the event of increased internal pressure or thermal runaway in the case of the housing portion 130. In the event of a rupture of the safety vent 170, the internal gas of the housing portion 130 can pass through the mounting hole 152 to be discharged to the outside of the battery cell 100 along the flow path.

[0086] In the event of an event such as thermal runaway in a battery cell 100, flames and various flammable gases may be generated. The heat generated in one battery cell 100 may cause thermal runaway in other adjacent battery cells 100.

[0087] High-temperature, high-pressure venting gas may be generated inside battery module 1, and a fire may occur if the venting gas comes into contact with oxygen. If the venting gas encounters oxygen outside battery module 1, the venting gas may cause the fire to escalate.

[0088] The exhaust portion 400 may be arranged in a region of the housing 200. As an example, the exhaust portion 400 may be formed on a portion of the end plate 210, but is not limited thereto, and may be formed on the side plate 220, etc.

[0089] Although not shown, the vent 400 is typically covered with a plug to separate the interior of the battery module 1 from the exterior. However, in the event of an event such as a fire in the battery module 1, the plug can be opened, and the gas inside the battery module 1 can be released through the vent 400.

[0090] The exhaust section 400 can discharge exhaust gases, debris, flames, etc. inside the battery module 1 to the outside of the battery module 1, thereby suppressing the occurrence of fire in the battery module 1 and the chain thermal runaway between the battery cells 100.

[0091] However, when the exhaust gas inside the battery module 1 is discharged to the outside of the battery module 1 through the exhaust 400, external oxygen may also flow into the battery module 1 through the exhaust 400, which may lead to a larger fire.

[0092] In the case where the battery module 1 is located in an electric vehicle, the seriousness of the problem may lie in the fact that a fire caused by exhaust gases or other substances coming into contact with oxygen outside the battery module 1 could result in personal injury or death.

[0093] The following will describe the exhaust section 400, which reduces the concentration of exhaust gases, rapidly diffuses exhaust gases, and reduces flame generation.

[0094] Figure 4 yes Figure 1 A schematic plan view of an embodiment of the exhaust section. Figure 5 It is along Figure 4 The cross-sectional view taken from line II-II'.

[0095] The vent 400 may be arranged in a region of the housing 200 of the battery module 1. The vent 400 may include an outer hopper 410 arranged through the housing 200.

[0096] The outer surface of the outer funnel 410 can contact the housing 200 to connect the housing 200 and the vent 400. The inner surface of the outer funnel 410 can define a vent 415 that penetrates the housing 200, and the diameter of the vent 415 can increase toward the outside of the battery module 1.

[0097] In some examples, the vent 400 may include a vent 415 extending in the x-axis direction, which is the thickness direction of the housing 200, and the vent 415 may be defined by the inner surface of the outer funnel 410 having a diameter that increases toward the outside of the battery module 1.

[0098] Because of the vent 415 with an increased diameter toward the outside of the battery module 1, the flow rate of exhaust gas and the like diffused from the inside of the battery module 1 toward the outside of the battery module 1 can be increased, thereby reducing the concentration of combustible exhaust gas and suppressing the inflow of oxygen from the outside of the battery module 1 into the battery module 1.

[0099] This reduces the likelihood and size of flames caused by the reaction of exhaust gases with oxygen inside and outside the battery module 1. It also mitigates and suppresses the backflow of exhaust gases into the battery module 1.

[0100] refer to Figure 4 and Figure 5 According to the embodiment, the exhaust section 400 may further include an outer funnel 410 that penetrates a portion of the housing 200, an inner funnel 420 located at the center of the outer funnel 410, and a connecting portion 430 connecting the inner funnel 420 and the outer funnel 410.

[0101] The outer funnel 410 may include a vent 415 defined by its inner surface. The diameter of the inner surface of the outer funnel 410, for example, the diameter of the vent 415, may increase toward the outside of the battery module 1. The outer funnel 410 may support the inner funnel 420 and the connecting portion 430.

[0102] The venting portion 400 (e.g., the outer funnel 410) may have a thickness corresponding to the thickness of the housing 200. However, it is not limited thereto; the thickness of the venting portion 400 may be thinner or thicker than the thickness of the housing 200. The venting portion 400 may be arranged to protrude to the outside of the battery module 1 based on the outer surface of the housing 200, or it may be arranged to be recessed compared to the outer surface of the housing 200. The venting portion 400 may be arranged to protrude to the inside of the battery module 1 based on the inner surface of the housing 200, or it may be arranged to be recessed compared to the inner surface of the housing 200.

[0103] As an example, the outer funnel 410 may further include a cooling section 470 surrounding the vent 415. Cooling water may be stored inside the cooling section 470 and may circulate with the vent 415 positioned inside the cooling section 470. Although not shown, the housing 200 may include a section where cooling water flows to the cooling section 470 and where cooled water that has absorbed heat is discharged from the cooling section 470. The cooling water inside the cooling section 470 may absorb heat from debris that will be discharged to the outside of the battery module 1, thereby reducing the likelihood that the debris will act as an ignition source.

[0104] The inner funnel 420 can be formed as a cylinder with its diameter increasing from the center of the vent 415 toward the outside of the battery module 1. The inner funnel 420 can be connected to the connecting portion 430 and supported by the outer funnel 410. As an example, the thickness of the inner funnel 420, measured in the x-axis direction from the inside to the outside of the housing 200, can be thinner than the thickness of the outer funnel 410, and the outer surface of the inner funnel 420 can be arranged to correspond to the outer surface of the outer funnel 410.

[0105] Exhaust gases can be discharged to the outside of the battery module 1 through the gap between the inner funnel 420 and the outer funnel 410. The gap between the outer funnel 410 and the inner funnel 420 can be increased towards the outside of the battery module 1. For example, the distance between the outer funnel 410 and the inner funnel 420 can be increased towards the outside of the battery module 1.

[0106] This can increase the flow rate of exhaust gases to the outside of the battery module 1, but can suppress the easy inflow of oxygen from the outside of the battery module 1 into the battery module 1.

[0107] The inner funnel 420 can diffuse exhaust gases at a certain angle relative to the center of the exhaust port 415, so that the exhaust gases can diffuse at a faster rate than the exhaust gases that diffuse along the center of the exhaust port 415 toward the outside of the battery module 1 without the inner funnel 420. Therefore, it is more difficult for oxygen and flames outside the battery module 1 to be introduced into the battery module 1.

[0108] The connecting portion 430 can connect the outer funnel 410 and the inner funnel 420. The number of connecting portions 430 is not limited, and for example, there can be six. The width of the connecting portion 430 can be wide enough to support at least the inner funnel 420, but it can be formed thin enough to allow exhaust gases to be discharged to the outside of the battery module 1.

[0109] Figure 6 yes Figure 1 A schematic plan view of another embodiment of the exhaust section. Figure 7 It is along Figure 6The cross-sectional view taken from line III-III'.

[0110] The vent 500 can be disposed in a region of the housing 200 of the battery module 1. The vent 500 may include an outer funnel 510 having an inner surface that defines a vent hole 515 penetrating the housing 200. The outer surface of the outer funnel 510 may contact the housing 200 to connect the housing 200 and the vent 500. The diameter of the vent hole 515 may increase toward the outside of the battery module 1.

[0111] In some examples, the vent 500 may include a vent 515 extending in the x-axis direction, which is the thickness direction of the housing 200, and the vent 515 may be defined by the inner surface of the outer funnel 510 having a diameter that increases toward the outside of the battery module 1.

[0112] Because of the vent 515 with an increased diameter toward the outside of the battery module 1, the flow rate of exhaust gas and the like diffused from the inside of the battery module 1 toward the outside of the battery module 1 can be increased, thereby reducing the concentration of combustible exhaust gas and suppressing the inflow of oxygen from the outside of the battery module 1 into the inside of the battery module 1.

[0113] This reduces the likelihood and size of flames caused by the reaction of exhaust gases with oxygen inside and outside the battery module 1. It also mitigates and suppresses the backflow of exhaust gases into the battery module 1.

[0114] refer to Figure 6 and Figure 7 According to the embodiment, the exhaust section 500 may include an outer funnel 510, an inner funnel 520, a connecting portion 530 connecting the outer funnel 510 and the inner funnel 520, and a cooling portion 570.

[0115] The inner funnel 520 may include an opening 525 formed along the center of the vent 515, for example, through the inner funnel 520 in the x-axis direction, which is the thickness direction of the inner funnel 520. The opening 525 may be defined by the inner surface of the inner funnel 520. The diameter of the opening 525 may increase toward the outside of the battery module 1.

[0116] The opening 525 allows the exhaust section 500 to discharge exhaust gases in two directions (i.e., between the outer funnel 510 and the inner funnel 520 and through the opening 525), enabling the exhaust gases to diffuse rapidly and disperse over a wide area outside the battery module 1. This can further reduce the concentration of exhaust gases, thereby reducing the likelihood and size of flame generation due to the reaction with oxygen.

[0117] The connecting portion 530 can connect the outer funnel 510 and the inner funnel 520, such that the inner funnel 520 is supported by the outer funnel 510. To achieve this, at least three connecting portions 530 can exist. As an example, the distance between adjacent connecting portions 530 in the three connecting portions 530 can be the same.

[0118] Unless otherwise stated, refer to Figure 4 and Figure 5 The description of the exhaust section 400 can be applied to the exhaust section 500 according to this embodiment.

[0119] Figure 8 yes Figure 1 A schematic plan view of another embodiment of the exhaust section. Figure 9 It is along Figure 8 The cross-sectional view taken from line IV-IV'.

[0120] The vent 600 can be disposed in a region of the housing 200 of the battery module 1. The vent 600 may include an outer funnel 610 formed through a portion of the housing 200 and having an inner surface defining a vent 615. The outer surface of the outer funnel 610 can contact the housing 200 to connect the housing 200 and the vent 600. The diameter of the vent 615 can increase toward the outside of the battery module 1.

[0121] In some examples, the vent 600 may include a vent 615 extending in the x-axis direction, which is the thickness direction of the housing 200, and the vent 615 may be defined by the inner surface of the outer funnel 610 having a diameter that increases toward the outside of the battery module 1.

[0122] Because of the vent 615 with an increased diameter toward the outside of the battery module 1, the flow rate of exhaust gas and the like diffused toward the outside of the battery module 1 can be increased, thereby reducing the concentration of combustible exhaust gas and suppressing the inflow of oxygen from the outside of the battery module 1 into the inside of the battery module 1.

[0123] This reduces the likelihood and size of flame generation attributable to the reaction of exhaust gases with oxygen inside and outside the battery module 1. It also mitigates and suppresses the backflow of exhaust gases into the battery module 1.

[0124] refer to Figure 8 and Figure 9 According to the embodiment, the exhaust section 600 may include an outer funnel 610, an inner funnel 620, a connecting portion 630 connecting the outer funnel 610 and the inner funnel 620, a mesh portion 650 sealing the exhaust port 615, and a cooling portion 670.

[0125] The mesh portion 650 can be connected to the outer funnel 610 and can be arranged in the z-axis direction perpendicular to the extension direction of the vent 615 so as to block the vent 615.

[0126] The mesh portion 650 can be a structure formed by regularly intersecting several lines, and can have a mesh structure by connecting nodes (intersections) and edges (lines). The mesh openings of the mesh portion 650 can have various patterns, such as square or hexagonal patterns. However, the mesh portion 650 is not limited to this and can have a shape including multiple openings.

[0127] The mesh portion 650, which has a mesh shape with small holes, can suppress the spread of fire by blocking high-temperature debris (which can act as a flame source and ignition source) from leaking to the outside of the battery module 1, and suppress the accumulation of pressure or heat in the battery module 1 by allowing heat and exhaust gases to pass through it.

[0128] Exhaust gases can be discharged to the outside of the battery module 1 through the vent 615 via holes defined by the lines of the mesh portion 650. When the distance between the lines of the mesh portion 650 is small (e.g., small mesh size), flames and debris heading towards the outside of the battery module 1 can be blocked.

[0129] With smaller holes in the mesh section 650, it becomes more difficult to release exhaust gases such as carbon monoxide and hydrogen, which could potentially cause a fire when they come into contact with oxygen outside the battery module 1.

[0130] If the openings in the mesh portion 650 are too small, ventilation may be insufficient, potentially causing pressure or heat to accumulate inside the battery module 1. As another example, if the openings in the mesh portion 650 are too large, flames, debris, and flammable gases may be directly released to the outside of the battery module 1, leading to a larger fire.

[0131] The mesh size of the mesh portion 650 can be adjusted according to the type, composition, and concentration of the combustible exhaust gas. The mesh size of the mesh portion 650 can be, for example, in the range of 1 mm to 10 mm, preferably in the range of 2 mm to 5 mm.

[0132] The mesh portion 650 may include a material with high heat resistance, fire resistance and deformation resistance, and may include, for example, a metal or ceramic material.

[0133] The mesh portion 650 can be spaced apart from the inner funnel 620 located at the center of the outer funnel 610, and can be positioned further away from the outside of the battery module 1 than the inner funnel 620. As debris and non-flammable gases pass through the mesh portion 650 and have cooled, they can be discharged to the outside of the battery module 1 via the vent 615. This reduces the risk of a large fire outside the battery module 1.

[0134] Unless otherwise stated, refer to Figures 4 to 7 The descriptions of exhaust sections 400 and 500 can be applied to exhaust section 600 according to this embodiment.

[0135] Figure 10 yes Figure 1 A schematic plan view of another embodiment of the exhaust section. Figure 11 It is along Figure 10 A cross-sectional view taken from line V-V'.

[0136] The vent 700 may be arranged in a region of the housing 200 of the battery module 1. The vent 700 may include an outer funnel 710 arranged through the housing 200.

[0137] The outer surface of the outer funnel 710 can contact the housing 200 to connect the housing 200 and the vent 700. The inner surface of the outer funnel 710 can define a vent 715 that penetrates the housing 200, and the diameter of the vent 715 can increase toward the outside of the battery module 1.

[0138] In some examples, the vent 700 may include a vent 715 extending in the x-axis direction, which is the thickness direction of the housing 200, and the vent 715 may be defined by the inner surface of the outer funnel 710 having a diameter that increases toward the outside of the battery module 1.

[0139] Because of the vent 715 with an increased diameter toward the outside of the battery module 1, the flow rate of exhaust gas and the like diffused from the inside of the battery module 1 toward the outside of the battery module 1 can be increased, thereby reducing the concentration of combustible exhaust gas and suppressing the inflow of oxygen from the outside of the battery module 1 into the inside of the battery module 1.

[0140] This reduces the likelihood and size of flame generation attributable to the reaction of exhaust gases with oxygen inside and outside the battery module 1. It also mitigates and suppresses the backflow of exhaust gases into the battery module 1.

[0141] refer to Figure 10 and Figure 11 According to the embodiment, the exhaust section 700 may include an outer funnel 710, a mesh section 750, and a cooling section 770.

[0142] Due to the high temperature and pressure inside the battery module 1, the mesh portion 750 may deform, and fragments may be generated due to the deformation of the mesh portion 750. If these high-temperature fragments are released to the outside of the battery module 1, they may act as ignition sources.

[0143] The cooling portion 770 can be formed in the outer funnel 710 to surround the exhaust port 715, and as an example, it can be formed to surround the mesh portion 750.

[0144] The cooling water inside the cooling section 770 can absorb heat from debris and exhaust gas passing through the vent 715, as well as heat from the mesh section 750 itself. This can prevent debris caused by the mesh section 750 from acting as an ignition source outside the battery module 1.

[0145] Unless otherwise stated, refer to Figures 4 to 9 The descriptions of exhaust sections 400, 500, and 600 can be applied to exhaust section 700 according to this embodiment.

[0146] Figure 12 yes Figure 1 A schematic plan view of another embodiment of the exhaust section. Figure 13 It is along Figure 12 The cross-sectional view taken from line VI-VI'.

[0147] An exhaust vent 800 may be disposed in a region of the housing 200 of the battery module 1. The exhaust vent 800 may include an outer funnel 810 having an inner surface defining an exhaust port 815 that penetrates a portion of the housing 200. The outer surface of the outer funnel 810 may contact the housing 200 to connect the housing 200 and the exhaust vent 800. The diameter of the exhaust port 815 may increase outwards from the battery module 1.

[0148] In some examples, the vent 800 may include a vent 815 extending in the x-axis direction, which is the thickness direction of the housing 200, and the vent 815 may be defined by the inner surface of the outer funnel 810 having a diameter that increases toward the outside of the battery module 1.

[0149] Because of the vent 815 with an increased diameter toward the outside of the battery module 1, the flow rate of exhaust gas and the like diffused from the inside of the battery module 1 toward the outside of the battery module 1 can be increased, thereby reducing the concentration of combustible exhaust gas and suppressing the inflow of oxygen from the outside of the battery module 1 into the inside of the battery module 1.

[0150] This reduces the likelihood and size of flame generation attributable to the reaction of exhaust gases with oxygen inside and outside the battery module 1. It also mitigates and suppresses the backflow of exhaust gases into the battery module 1.

[0151] refer to Figure 12 and Figure 13 According to the embodiment, the exhaust section 800 may include an outer funnel 810, an inner funnel 820, a connecting portion 830 connecting the outer funnel 810 and the inner funnel 820, and a cooling portion 870.

[0152] The inner surface of the outer funnel and the outer and / or inner surface of the inner funnel are at the same level. Figure 5 , Figure 7 , Figure 9 and Figure 11 The image is shown as having a curve, but is not limited to this, and can also be formed as having a straight line, such as... Figure 13 As shown, not a curve.

[0153] Regardless of the curves or straight lines of the inner surface of the outer funnel and the outer and / or inner surfaces of the inner funnel, the diffusion characteristics can be improved and the concentration of the exhaust gas can be reduced by optimizing the angle at which the exhaust gas is discharged to the outside of the battery module 1.

[0154] The angle α formed by the straight line on the inner surface of the outer funnel 810 (which connects the point of contact with the outside of the battery module 1 and the point of contact with the inside of the battery module 1) and the line connecting the center of the exhaust port 815 can be at least the angle at which the discharged exhaust gas disperses and diffuses to the outside of the battery module 1 and the emitted flame does not contact the battery module 1.

[0155] In some examples, angle α can be the slope of the straight line connecting the opposite ends of the outer funnel 810 in the thickness direction of the housing 200. Angle α can be, for example, in the range of 30° to 60°.

[0156] Unless otherwise stated, refer to Figures 4 to 11 The descriptions of exhaust sections 400, 500, 600 and 700 can be applied to exhaust section 800 according to this embodiment.

[0157] The foregoing description covers only battery module 1, but this disclosure can also be applied to battery packs. A battery pack may include multiple individual battery cells 100 themselves or multiple battery modules 1. The vent 400 described herein can similarly be applied to a battery pack, for example, to the battery pack housing. Therefore, a battery pack with improved fire extinguishing capabilities can be disclosed.

[0158] According to one or more embodiments, a battery module including an exhaust section can provide enhanced fire extinguishing capability, wherein the exhaust port in the exhaust section widens toward the outside of the battery module.

[0159] However, the effects that can be obtained through this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the description of this disclosure other technical effects not mentioned.

[0160] While this disclosure has been described herein with respect to a limited number of embodiments and accompanying drawings, this disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations may be made therein in terms of the technical aspects of this disclosure and within the equivalent scope of the appended claims.

Claims

1. A battery module, comprising: Multiple battery cells; A housing that accommodates the plurality of battery cells; as well as An exhaust section is arranged in a part of the housing. in: The exhaust section includes an outer funnel arranged through the housing. The inner surface of the outer funnel defines an exhaust port that penetrates the housing, and The diameter of the vent increases outwards from the battery module.

2. The battery module according to claim 1, wherein: The exhaust section further includes an inner funnel located at the center of the outer funnel and a connecting portion that connects the inner funnel and the outer funnel to each other.

3. The battery module according to claim 2, wherein, The distance between the outer funnel and the inner funnel increases toward the outside of the battery module.

4. The battery module according to claim 2, wherein, The thickness of the inner funnel, measured from the inside to the outside of the housing, is less than the thickness of the outer funnel.

5. The battery module according to claim 4, wherein, The inner funnel includes an opening formed through the inner funnel in the thickness direction.

6. The battery module according to claim 5, wherein, The diameter of the opening increases toward the outside of the battery module.

7. The battery module according to claim 1, wherein, The exhaust section includes a mesh portion arranged in a direction substantially perpendicular to the extension direction of the exhaust port to block the exhaust port.

8. The battery module according to claim 7, wherein, The mesh portion has a mesh size in the range of 1 mm to 10 mm.

9. The battery module according to claim 7, wherein: The exhaust section further includes an inner funnel located at the center of the outer funnel, and The inner funnel is spaced apart from the mesh portion and is positioned closer to the outside of the battery module than the mesh portion.

10. The battery module according to claim 1, wherein, The outer funnel further includes a cooling section surrounding the vent.

11. A battery module, comprising: Multiple battery cells; A housing that accommodates the plurality of battery cells; as well as An exhaust section is arranged in a part of the housing. in: The venting section includes an outer funnel, an inner funnel, and a connecting portion. The outer funnel has an inner surface defining an vent hole penetrating the housing. The inner funnel is located at the center of the outer funnel. The connecting portion connects the inner funnel and the outer funnel to each other. The gap between the outer funnel and the inner funnel increases toward the outside of the battery module.

12. The battery module according to claim 11, wherein, The diameter of the vent increases toward the outside of the battery module.

13. The battery module according to claim 11, wherein, The thickness of the inner funnel, measured from the inside to the outside of the housing, is less than the thickness of the outer funnel.

14. The battery module according to claim 13, wherein, The inner funnel includes an opening formed through the inner funnel in the thickness direction.

15. The battery module according to claim 14, wherein, The diameter of the opening increases toward the outside of the battery module.

16. The battery module according to claim 11, wherein, The exhaust section includes a mesh portion arranged in a direction substantially perpendicular to the extension direction of the exhaust port to block the exhaust port.

17. The battery module according to claim 16, wherein, The mesh portion has a mesh size in the range of 1 mm to 10 mm.

18. The battery module according to claim 16, wherein, The inner funnel is spaced apart from the mesh portion and is positioned closer to the outside of the battery module than the mesh portion.

19. The battery module according to claim 11, wherein, The outer funnel further includes a cooling section surrounding the vent.

20. The battery module according to claim 11, wherein, The slope of the straight line connecting the outer funnel to the opposite ends in the thickness direction of the shell is in the range of 30° to 60°.

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