KR20210029124A - Energy Storage Module - Google Patents

Abstract

The present invention relates to an energy storage module capable of reducing a fire risk of battery cells and improving safety by minimizing a fire spreading between adjacent battery cells when a fire occurs. As an example, disclosed is an energy storage module which includes: a plurality of battery cells arranged in a longitudinal direction so that long side surfaces thereof face each other; a plurality of insulating spacers interposed between the long side surfaces of the plurality of battery cells; a cover member having an accommodating space therein and accommodating the plurality of battery cells and the plurality of insulating spacers; a top plate having a duct coupled to an upper portion of the cover member and formed at positions corresponding to vents of the plurality of battery cells, and having an open hole formed at positions corresponding to the insulating spacers; a top cover coupled to an upper portion of the top plate and having a discharge hole corresponding to the duct; and an extinguisher sheet located between the top cover and the top plate and configured to emit a fire extinguishing agent at a preset temperature or above, wherein the energy storage module further includes a protrusion that is formed on a lower surface of the top cover to surround an exhaust area and be coupled to the outside of the duct, and wherein the insulating spacers include: a first sheet having flame retardancy or nonflammability; and second sheets having heat insulating properties which are attached to both surfaces of the first sheet through an adhesive, respectively.

Description

Energy Storage Module

The present invention relates to an energy storage module capable of improving stability.

The energy storage module is connected to renewable energy and power systems such as solar cells, and is configured to store power when the power demand of the load is low, and then use the stored power when the power demand of the load is large. It refers to a device including a large number of battery cells composed of.

Typically, a plurality of battery cells are accommodated in a plurality of trays, a plurality of trays are stored in a rack, and a plurality of racks are stored in a container box.

Meanwhile, a fire has recently occurred in an energy storage module, and due to the nature of the energy storage module, when a fire occurs, there is a problem that it is not easy to extinguish. Since the energy storage module is composed of a plurality of battery cells, it is common to have a high capacity and high output, and accordingly, a technology for enhancing safety is being studied.

The present invention provides an energy storage module capable of improving stability by reducing the risk of fire of a battery cell and minimizing the transition between battery cells in the event of a fire.

The energy storage module according to various embodiments of the present invention includes a plurality of battery cells arranged along a length direction so that their long sides face each other, a plurality of insulating spacers interposed between the long sides of the plurality of battery cells, and A cover member having an accommodation space and accommodating the plurality of battery cells and the plurality of insulating spacers, a duct coupled to an upper portion of the cover member and formed at a position corresponding to a vent of the plurality of battery cells, the An upper plate having an open hole formed at a position corresponding to the insulating spacer, an upper cover coupled to an upper portion of the upper plate and including a discharge hole at a position corresponding to the duct, and located between the upper cover and the upper plate , A fire extinguishing sheet for extinguishing a fire extinguishing agent at a predetermined temperature or higher, and a protrusion surrounding the exhaust area and coupled to the outside of the duct is further provided on a lower surface of the upper cover, and the insulating spacer has flame retardancy or non-combustibility. The first sheet and the second sheet having heat insulating properties may be attached to both surfaces of the first sheet through an adhesive, respectively.

The first sheet may be ceramic paper, and the second sheet may be MICA.

The first sheet may be a ceramic fiber containing an alkaline earth metal.

The plurality of battery cells may be spaced apart from each other by a first separation distance between opposite long side surfaces, and a thickness of the insulating spacer may be less than 50% of the first separation distance.

The fire extinguishing agent sprayed from the fire extinguishing sheet may be applied to a space spaced apart from the insulating spacer and the battery cell through the open hole, so that it may contact the long side surface of the battery cell.

The insulating spacer has a size in the width direction smaller than twice the size in the height direction, and the first sheet and the second sheet may include a sheet portion having both ends of the insulating spacer bonded by an adhesive.

The insulating spacer may further include an edge portion of a plastic material formed by insert injection so as to surround the edge of the sheet portion.

The first sheet and the second sheet may have a central portion spaced apart from each other, and an air flow path capable of air movement may be provided.

The size of the insulating spacer in the width direction is larger than twice the size in the height direction, and a predetermined region of the first sheet and the second sheet may be adhered to each other from upper and lower ends by an adhesive.

The upper cover may further include an inclined portion whose thickness increases toward the protrusion from the exhaust area.

The upper end of the duct may be located below the inclined portion.

A spaced space is formed between the duct and the protrusion, and some of the gas discharged from the vent may pass through the duct and be discharged to the spaced space through the inclined part.

The inner diameter of the duct may decrease from the bottom to the top.

The areas of the plurality of discharge holes may be set to be larger than 30% of the area of the exhaust area.

The energy storage module according to the present invention primarily suppresses ignition by allowing a shutdown function inside the battery cell through the material of the negative electrode and the positive electrode active material, and when a vent operates or ignition occurs in the battery cell, extinguishing and Cooling can be performed quickly to prevent heat from spreading to adjacent battery cells.

1 is a perspective view of an energy storage module according to an embodiment of the present invention.
2 is an exploded perspective view of an energy storage module according to an embodiment of the present invention.
3 is an exploded perspective view illustrating a position at which a fire extinguishing sheet is coupled to a top cover of an energy storage module according to an embodiment of the present invention from a bottom surface.
4 is a perspective view illustrating a state in which battery cells and insulating spacers are disposed on a lower plate in an energy storage module according to an embodiment of the present invention.
5 is an exploded perspective view illustrating a secondary battery, an upper plate, and an upper cover in an energy storage module according to an embodiment of the present invention.
6 is a partial diagram illustrating a state in which an energy storage module according to an embodiment of the present invention is coupled to a rack.
7A and 7C are a cross-sectional view taken along line AA of FIG. 4, a cross-sectional view taken along line BB of FIG. 4, and partially enlarged views of FIG. 6B.
8 is a cross-sectional view showing a duct according to another embodiment of the present invention.
9 is a perspective view showing a state in which the fire extinguishing sheet is coupled to the upper plate of the energy storage module according to an embodiment of the present invention.
10 is an enlarged view of part B of FIG. 9.
11A and 11B are conceptual diagrams illustrating a state in which a fire extinguishing sheet operates in an energy storage module according to an embodiment of the present invention.
12 is a cross-sectional view taken along line CC of FIG. 1.
13 is a perspective view illustrating an insulating spacer in an energy storage module according to an embodiment of the present invention.
14A and 14B are exploded perspective views illustrating an exemplary configuration of a sheet portion of an insulating spacer in an energy storage module according to an embodiment of the present invention.
FIG. 15 is a cross-sectional view taken along line DD after the sheet portions of FIG. 14A are combined.
16 is an enlarged view of part C of FIG. 13.
17 is a perspective view of an energy storage module according to another embodiment of the present invention.
18 is a bottom perspective view of an energy storage module according to another embodiment of the present invention.
19 is a cross-sectional view taken along line EE of FIG. 17.
20 is a perspective view illustrating a state in which a battery cell and an insulating spacer are disposed on a cover member in an energy storage module according to another embodiment of the present invention.
21A and 21B are perspective and exploded perspective views illustrating a configuration of an insulating spacer in an energy storage module according to another embodiment of the present invention.
22 is a cross-sectional perspective view taken along line FF of FIG. 17.
23A and 23B are perspective and cross-sectional views of a battery cell used in an energy storage module according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals refer to the same elements in the drawings. As used herein, the term “and/or” includes any and all combinations of one or more of the corresponding listed items. In addition, in the present specification, "connected" means not only the case where the A member and the B member are directly connected, but also the case where the member A and the member B are indirectly connected by interposing the member C between the member A and the member B. do.

The terms used in this specification are used to describe specific embodiments, and are not intended to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly indicates another case. Also, as used herein, “comprise” and/or “comprising” specify the presence of the mentioned shapes, numbers, steps, actions, members, elements and/or groups thereof. And does not exclude the presence or addition of one or more other shapes, numbers, actions, members, elements and/or groups.

In this specification, terms such as first and second are used to describe various members, parts, regions, layers and/or parts, but these members, parts, regions, layers and/or parts are limited by these terms. It is self-evident that it should not be. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Accordingly, a first member, component, region, layer or part to be described below may refer to a second member, component, region, layer or part without departing from the teachings of the present invention.

Terms relating to space such as “beneath”, “below”, “lower”, “above”, and “upper” are used in conjunction with an element or feature shown in the drawing. It is used for easy understanding of other elements or features. Terms related to these spaces are for easy understanding of the present invention according to various process conditions or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature in a drawing is flipped over, an element described as “lower” or “below” becomes “top” or “above”. Thus, "below" is a concept encompassing "top" or "bottom".

Hereinafter, a configuration of a secondary battery according to an embodiment of the present invention will be described.

1 is a perspective view of an energy storage module according to an embodiment of the present invention. 2 is an exploded perspective view of an energy storage module according to an embodiment of the present invention. 3 is an exploded perspective view illustrating a position at which a fire extinguishing sheet is coupled to a top cover of an energy storage module according to an embodiment of the present invention from a bottom surface. 4 is a perspective view illustrating a state in which battery cells and insulating spacers are disposed on a lower plate in an energy storage module according to an embodiment of the present invention.

First, referring to FIGS. 1 to 4, the energy storage module 100 according to an embodiment of the present invention includes a cover member 110, a battery cell 120, an insulating spacer 130, an upper plate 140, It may include a configuration of the fire extinguishing sheet 150 and the upper cover 160.

First, the cover member 110 provides a space for accommodating an internal battery cell and an insulating spacer. The cover member 110 includes a lower plate 111, an end plate 112, and a side plate 113, and through this, a space in which a battery cell and an insulating spacer are disposed, as described later, may be provided. In addition, the cover member 111 may fix the position of the battery cell and the insulating spacer, and protect the battery cell from external impact.

In the battery cell 120, the electrode assembly may be accommodated in the case 121, and the electrode assembly is in a state in which a separator is positioned between a positive electrode plate and a negative electrode plate coated with an active material on a coating portion, for example, It can be constructed in a way that is wound, stacked or laminated. In addition, the cap plate 124 may seal the upper portion of the case 121. In addition, a vent 124a formed to have a thinner thickness compared to other regions may be formed at approximately the center of the cap plate 124. In addition, in the battery cell 120, regions of the positive plate and the negative plate to which the active material is not applied, for example, electrode terminals 122 and 123 electrically connected to the uncoated portion may be exposed above the cap plate 124. Here, the electrode terminals 122 and 123 may be referred to as a first electrode terminal 122 and a second electrode terminal 123, respectively, and may be a negative electrode and a positive electrode terminal, respectively. Of course, on the contrary, the first electrode terminal 122 and the second electrode terminal 123 may be positive and negative terminals, respectively. Meanwhile, through the composition of the active material of the battery cell 120, ignition can be reduced to increase stability, and the composition of such an active material will be described later.

The insulating spacer 130 is interposed between the battery cells 120 to prevent the battery cells 120 from contacting each other, thereby maintaining electrical independence. In addition, by maintaining a predetermined distance between the insulating spacer 130 and the battery cell 120, a passage for external air or a passage for moving the extinguishing chemical solution may be provided so that the battery cell 120 is cooled. Such an insulating spacer 130 may be used by mixing a flame-retardant or non-flammable sheet to prevent flame from spreading and an insulating sheet to prevent heat from spreading when a fire occurs in the battery cell 120, such an insulating spacer The configuration of (130) will be described later.

The upper plate 140 may be coupled to the upper portion of the cover plate 110. The upper plate 140 may be coupled to the cover plate 110 while covering the upper portion of the battery cell 120. In addition, the first electrode terminal 122 and the second electrode terminal 123 of the battery cell 120 are exposed above the upper plate 140, and the bus bar 145 is coupled to each terminal, so that the battery cell 120 can be connected in series, parallel, or serial-parallel form.

Meanwhile, the upper plate 140 includes a duct 141 corresponding to the vents 124a formed on the upper surfaces of the plurality of battery cells 120. A plurality of ducts 141 may be arranged in one direction, for example, along a length direction. Accordingly, the gas discharged by operating the vent 124a of the battery cell 120 may move upward along the duct 141 of the upper plate 140. The specific structure and operation of the duct 141 will be described later.

The fire extinguishing sheet 150 is located between the upper plate 140 and the upper cover 160. The fire extinguishing sheet 150 may be formed as at least one member extending along one direction of the upper plate 140, for example, a length direction. In addition, the fire extinguishing sheet 150 may be provided with an open hole 151 penetrating between the upper surface and the lower surface at a position corresponding to the duct 141 of the upper plate 140. Accordingly, the fire extinguishing sheet 150 may be positioned so that the open hole 151 matches the duct 141 of the upper plate 140. In addition, the fire extinguishing sheet 150 may be coupled to the lower surface 160b of the upper cover 160. As the fire extinguishing sheet 150 is coupled to the lower portion of the upper cover 160, the fire extinguishing sheet 150 may be located above the upper plate 140. The configuration and operation of the fire extinguishing sheet 150 will be described later.

The upper cover 160 is coupled to the upper portion of the upper plate 140. The upper cover 160 may cover the upper plate 140 and the bus bar 145. In addition, the upper cover 160 may also cover the fire extinguishing sheet 150 coupled to the lower surface 160b, thereby protecting them from an impact applied from the upper surface 160a of the upper cover 160. In addition, the upper cover 160 may include a discharge hole 161. In addition, the upper cover 160 may further include a protrusion 162 spaced apart from the outer periphery of the discharge hole 161 and protruding downward. The open hole 151 of the fire extinguishing sheet 150 may be coupled to the outside of the protrusion 162, and the duct 141 may be coupled to the inner side of the protrusion 162. The discharge hole 161 may be formed by arranging a plurality of discharge holes 161 along one direction, for example, a length direction of the upper cover 160. In addition, the discharge hole 161 may be formed at a position corresponding to the duct 141 of the upper plate 140. In addition, the discharge hole 161 may also be provided in the form of a hole penetrating between the upper surface and the lower surface so as to be spaced apart from each other like the duct 141. Accordingly, the gas discharged by operating the vent 124a of the battery cell 120 may be discharged to the outside along the duct 141 of the upper plate 140 and the discharge hole 161 of the upper cover 160. have. In addition, the upper cover 160 may prevent a user from contacting with the internal structure of the upper cover 160 to promote safety.

In addition, the energy storage module 100 may be accommodated in a plurality of shelves of a rack equipped with a plurality of shelves, respectively. For example, the rack may be mounted such that a plurality of shelves are spaced apart from each other in an upper direction, and at least one energy storage module 100 may be accommodated on each shelf. In this case, the lower surface of one energy storage module 100 may contact the upper surface of the shelf, and the lower surface of the other shelf may be positioned at a predetermined interval on the upper surface.

Hereinafter, a coupling relationship between the duct 141 of the upper plate 140 and the upper cover 160 in the energy storage module according to an embodiment of the present invention will be described in more detail.

5 is an exploded perspective view illustrating a secondary battery, an upper plate, and an upper cover in an energy storage module according to an embodiment of the present invention. 6 is a partial diagram illustrating a state in which an energy storage module according to an embodiment of the present invention is coupled to a rack. 7A is a cross-sectional view taken along line A-A of FIG. 6, and FIG. 7B is a cross-sectional view taken along line B-B of FIG. 6. 7C is an enlarged view of a portion of FIG. 7A. 8 is a cross-sectional view showing a duct according to another embodiment of the present invention.

Referring to FIG. 5, a duct 141 formed on an upper plate 140 corresponds to an upper portion of the vent 124a of the battery cell 120, and a discharge hole of the upper cover 160 corresponds to an upper portion of the duct 141. 161 are arranged to correspond.

Here, the battery cell 120 has a shape in which the electrode assembly is accommodated in the case 121 and the cap plate 124 covers the upper portion of the case 121. The electrode assembly may be configured in a manner of winding, stacking, or laminating in a region, for example, in a state in which a separator is positioned between a positive electrode plate and a negative electrode plate on which an active material is applied to a coating portion. In addition, a vent 124a formed to have a thinner thickness compared to other regions may be formed at approximately the center of the cap plate 124. In addition, a first electrode terminal 122 and a second electrode terminal 123 electrically connected to the electrode assembly may be positioned on both sides of the cap plate 124. Hereinafter, for convenience, the first electrode terminal 122 is described as a negative terminal and the second electrode terminal 123 is described as a positive terminal, but the polarity may be reversed. Meanwhile, through the composition of the active material of the battery cell 120, ignition can be reduced to increase stability, and the composition of such an active material will be described later.

The duct 141 is a passage through which gas discharged through the vent 124a of the battery cell 120 passes, and is formed to protrude from the upper plate 140. In addition, the cross section of the duct 141 may be formed in a shape corresponding to the vent 124a of the battery cell 120, for example, in an elliptical shape. In addition, the duct 141 may be formed in a form in which the inner diameter decreases from the bottom to the top. In other words, the duct 141 may be formed to have the same thickness, and may be formed to be inclined at a certain angle α toward the inside of the duct 141 from the bottom to the top. The inclined angle α of the duct 141 is approximately 1° to 5° so that the duct 141 does not invade the operating range of the vent 124a of the battery cell 120 and allows gas to be easily discharged. , Preferably it may be 1° to 3°.

In addition, the height of the duct 141 may be formed to correspond to the height at which the upper cover 160 is positioned so that gas discharged through the vents 124a of the battery cells 120 can be effectively exhausted. Specifically, the height of the duct 141 may be set to 15mm to 20mm, preferably 18mm to 18.4mm. When the height of the duct 141 is 15 mm or more, the gas generated from the vent 124a of the battery cell 120 moves along the duct 141 and then hits the shelf 12, and returns to the vent 124a again. Can be prevented. In addition, when the height of the duct 141 is 20 mm or less, it is easy to manufacture the structure of the duct 141 with the shelf 12. Since the height of the duct 141 corresponds to the height of the upper cover 160, the gas that has passed through the duct 141 can move directly to the discharge hole 161 formed in the upper cover 160.

In addition, as shown in FIG. 8, the duct 141 ′ according to another exemplary embodiment of the present invention may be formed in a form in which the inner diameter increases from the bottom to the top. In addition, the duct 141 ′ is formed in a shape whose thickness decreases from the bottom to the top. Specifically, the inner surface of the duct 141 ′ may be formed to be inclined at a certain angle toward the outside toward the top, and the outer surface of the duct 141 ′ may be formed to be inclined at a certain angle toward the inner side toward the upper side. The duct 141 ′ has an inclined angle of approximately 1° to 5 in the duct 141 ′ so that gas can be easily discharged while not invading the operating range of the vent 124a of the battery cell 120. °, preferably 1 ° to 3 °. When the inclined angle of the inner surface is 1° or more, it is easy to concentrate the gas generated by the vent 124a of the battery cell 120 upward. In addition, when the inclined angle of the inner surface is 5° or less, it is advantageous to maintain the rigidity of the duct 141 ′, and it is possible to prevent the duct 141 ′ from being restricted when the gas moves upward.

6 and 7A to 5C, the upper cover 160 includes an exhaust area 161a in which a plurality of exhaust holes 161 are formed, a protrusion 162 formed on a lower surface, an exhaust area 161a, and a protrusion ( An inclined portion 163 formed between the 162 may be included. The exhaust area 161a is positioned above the duct 141 and may be defined as an area forming an edge around the exhaust hole 161. The thickness D2 of the exhaust region 161a is relatively thinner than the thickness D1 of the upper cover 160 (D1>D2). Specifically, the thickness D2 of the exhaust region 161a may be 2/3 or less of the thickness D1 of the upper cover 160. In addition, the minimum thickness D2 of the exhaust region 161a may be formed to be 1.0 mm or more so as to minimize the occurrence of flames when there is no problem in injection molding and gas is discharged. For example, if the thickness D1 of the upper cover 160 is about 2.5 mm, the thickness D2 of the exhaust area 161a may be about 1.5 mm.

In addition, gas discharged through the vent 124a of the battery cell 120 may be discharged through the discharge hole 161 in the exhaust region 161a. Although it is shown that three discharge holes 161 are formed in the drawing, the number of discharge holes 161 is not limited in the present invention. However, the total area of the plurality of discharge holes 161 is set to about 30% or more of the area of the exhaust area 161a, so that smooth exhaust performance can be exhibited. In addition, the width W1 of the discharge hole 161 may be set to be less than 3 mm. When the width (W1) of the discharge hole 161 is 3 mm or less, it is possible to prevent the flame generated inside from spreading to the outside, and the user's hand is directly exposed to the battery cell 120 from the outside of the upper cover 160. It is possible to increase safety by preventing contact with the product.

The discharge hole 161 is located inside the duct 141, and the upper end of the duct 141 is covered by the exhaust region 161a. In other words, a region in which the discharge hole 161 is not formed in the exhaust region 161a may be shown to extend to the inside of the duct 141 as shown in FIG. 5D. Here, the distance D3 of the exhaust region 161a extending inward from the duct 141 may be set within about 2 mm, preferably 1 mm to 1.5 mm.

The protrusion 162 protrudes from the lower surface 160b of the upper cover 160 and is coupled to the outside of the duct 141. The protrusion 162 may be formed to correspond to a cross section of the duct 141 and may be formed to surround the exhaust region 161a. In addition, the cross-sectional area of the protrusion 162 is formed larger than the cross-sectional area of the duct 141, so that a spaced space exists between the duct 141 and the protrusion 162. Some of the gas discharged through the vent 124a of the battery cell 120 may collide with the exhaust region 161a located above the duct 141 and then move to the spaced space. The protruding height D4 of the protrusion 162 may be about 2 to 4 mm, and preferably 3 mm. If the height (D4) of the protrusion 162 is less than 2mm, it is insufficient to guide the gas hitting the exhaust area 161a to the outside of the duct 141, and if it is greater than 4mm, it is higher than necessary, resulting in efficient gas discharge. You won't lose. In addition, the height ratio of the height D4 of the protrusion 162 and the height of the duct 141 may be about 1:4 to 1:9, and preferably 1:6. When the height ratio of the height (D4) of the protrusion 162 and the height of the duct 141 is 1:4 or more, it is easy to manufacture the protrusion 162 to cover the upper portion of the duct 141, and when the height of the protrusion 162 is 1:9 or less, the duct 141 The gas that has passed through) can be easily guided upwards.

The inclined portion 163 is located between the exhaust region 161a and the protruding portion 162. The inclined portion 163 connects between the exhaust region 161a having a relatively thin thickness and the protruding portion 162 in the upper cover 160 and thus is formed to be naturally inclined. That is, the inclined portion 163 may be formed in a form in which the thickness of the inclined portion 163 gradually increases toward the protruding portion 162 from the exhaust region 161a. The upper end of the duct 141 is positioned below the inclined portion 163. The inclined portion 163 serves to prevent gas discharged through the vent 124a of the battery cell 120 from flowing into the vent 124a. That is, even if the gas discharged through the vent 124a of the battery cell 120 moves upward along the duct 141 and hits the exhaust region 161a extending inside the duct 141, the inclined portion 163 ) And the protrusion 162 may be discharged to the outside of the duct 141. Accordingly, since the gas is prevented from flowing back into the vent 124a of the battery cell 120, the safety of the energy storage module 100 may be improved. In this case, the inclined portion 163 may be formed to have an inclination of approximately 30° to 60°, preferably 40° to 50° with the outer surface of the duct 141. When the angle of the inclined portion 163 with respect to the outer surface of the duct 141 is 30° or more, it is easy to prevent re-inflow by allowing the gas discharged through the vent 124a to be discharged to the outside. In this case, it is advantageous to form integrally with the protrusion 162.

Further, referring to FIG. 6, the energy storage module 100 according to an embodiment of the present invention may be provided in plural and be coupled to the rack 10. The energy storage modules 100 may be provided in different numbers according to the required capacity, and may be mounted and fixed on the rack 10. Here, the rack 10 may include a frame 11 forming an overall appearance and a shelf 12 supporting the lower portions of the plurality of energy storage modules 100 by different layers within the frame 11. In Figure 6, two shelves 12 are provided in the frame 11, and two energy storage modules 100 are shown to be seated on each shelf 12, but limiting the content of the present invention by the number no.

7A to 7C, when the vent 124a of the secondary battery 120 is broken, the gas moves upward along the duct 141 as indicated by an arrow. Although, in FIGS. 7A and 7B, the vent 124a is shown to remain in the cap plate 124, when the internal gas is substantially generated, the vent 124a may be broken and removed. In addition, some of the discharged gases collide with the exhaust region 161a extending inside the duct 141 and then move along the inclined portion 163 and the protruding portion 162. In addition, the gas passing through the duct 141 may be directed to the outside through the discharge hole 161 of the upper cover 160 located above the duct 141. At this time, by the shelf 12 accommodating another energy storage module 100 on the upper surface 160a of the upper cover 160, the gas is transferred to the upper surface 160a and the shelf 12 of the upper cover 160. ). In this case, the gap between the upper surface 160a of the upper cover 160 and the shelf 12 may be 3mm to 7mm. When the interval is 3mm or more, it is easy to discharge heat generated by the energy storage module 100 to the outside. In addition, when the interval is 7 mm or less, it is easy to form an atmosphere of a high-temperature inert gas as follows.

On the other hand, the gas discharged from the battery cell 120 through the vent 124a mainly generates a combustible gas of an electrolyte vapor component having a relatively low temperature of about 170°C, and gradually occurs at a relatively high temperature of about 400°C. Inert gas with temperature is generated. In addition, when a combustible gas having a relatively low temperature is generated at the beginning, the heat-resistant plastic constituting the upper plate 140 and the upper cover 160 may be maintained without being melted. In addition, the inclined portion 163 of the upper cover 160 serves to prevent, in particular, the low-temperature combustible gas generated at the beginning from entering the inside of the vent. Meanwhile, when the separator melts as the temperature inside the battery cell increases, a high-temperature inert gas may be generated along with the flame. In this case, as described above, the inert gas may fill the space between the upper cover 160 and the shelf to form an inert atmosphere. In addition, the inert gas may remain filled in the inner space of the duct 141. The inert gas may prevent the inflow of oxygen and block the flame generated from the battery cell 120 from being transmitted to the neighboring battery cell 120 or transmitted to another energy storage module. In addition, in the case of the fire extinguishing sheet 150 located under the upper cover 160, it is operated by a high-temperature inert gas, and as will be described later, it may perform a role of spraying a fire extinguishing agent.

Hereinafter, the configuration and operation of the fire extinguishing sheet 150 in the energy storage module 100 according to an embodiment of the present invention will be described.

9 is a perspective view showing a state in which the fire extinguishing sheet is coupled to the upper plate of the energy storage module according to an embodiment of the present invention. 10 is an enlarged view of part B of FIG. 9. 11A and 11B are conceptual diagrams illustrating a state in which a fire extinguishing sheet operates in an energy storage module according to an embodiment of the present invention.

First, the fire extinguishing sheet 150 may be positioned between the upper plate 140 and the upper cover 160, as described above. 9 and 10, the fire extinguishing sheet 150 may have an open hole 151 coupled to the duct 141 of the upper plate 140. In addition, accordingly, the fire extinguishing sheet 150 does not affect the movement of gas through the duct 141.

In addition, referring to FIGS. 11A and 11B, the fire extinguishing sheet 150 may operate in response to heat when a gas, specifically, a relatively high temperature, for example, an inert gas of about 400° C. is generated. At this time, the fire extinguishing agent constituting the fire extinguishing sheet 150 is injected from the fire extinguishing sheet 150 by the hot gas. In addition, since the upper part of the fire extinguishing sheet 150 is blocked by the upper cover 160, the fire extinguishing agent may be sprayed with a directionality toward the lower surface of the upper cover 160. In addition, the fire extinguishing agent may reach the insulating spacer 130 under the upper plate 140 through an open hole 143 formed at the front and rear ends of the duct 141 of the upper plate 140. In addition, the duct 141 is further formed with a chemical solution guide protrusion 142 about the periphery of the open hole 143, so that movement of the fire extinguishing agent may be additionally guided. On the other hand, as will be described later, the extinguishing agent reaching the insulating spacer 130 may move along the surface of the insulating spacer 130, and accordingly, the extinguishing of the battery cell 120 having ignition is as well as the battery cell 120. Cooling of can be performed.

In addition, the fire extinguishing sheet 150 may have a sheet form in which a capsule-type fire extinguishing agent is accommodated in the exterior material. Here, the fire extinguishing sheet 150 is, as described above, when the temperature of the gas passing through the duct 141 of the upper plate 140 reaches a relatively high temperature of about 400°C, the capsule and the exterior material are opened to Fire extinguishing agents can be sprayed.

Hereinafter, the structure and operation of the battery cell 120 and the insulating spacer 130 in the energy storage module according to an embodiment of the present invention will be described.

12 is a cross-sectional view taken along line C-C of FIG. 1. 13 is a perspective view illustrating an insulating spacer in an energy storage module according to an embodiment of the present invention. 14A and 14B are exploded perspective views illustrating an exemplary configuration of a sheet portion of an insulating spacer in an energy storage module according to an embodiment of the present invention. FIG. 15 is a cross-sectional view taken along line D-D after the sheet portions of FIG. 14A are combined. 16 is an enlarged view of part C of FIG. 12.

The battery cells 120 may be disposed alternately with the insulating spacer 130 on the upper surface of the lower plate 111 of the cover member 110. In this case, the long side surface of the battery cell 120 may face each other while being spaced apart from the long side surface of the adjacent battery cell 120 by a predetermined distance, and an insulating spacer 130 may be interposed therebetween. Here, the first separation distance, which is the separation distance between the long side surfaces of the two battery cells 120, may be any one of 4mm to 6mm. Here, when the first separation distance is less than 4 mm, it is not easy to form an air layer between the insulating spacer 130 and the battery cell 120, and cooling performance may be deteriorated. In addition, when the first separation distance exceeds 6 mm, it may unnecessarily increase the size of the energy storage module 100.

The insulating spacer 130 prevents the battery cells 120 from contacting each other between the battery cells 120, thereby maintaining electrical independence. Such an insulating spacer 130 may have a planar size corresponding to a planar size of a long side of one battery cell 120. That is, the insulating spacer 130 may have one side facing the long side of one battery cell 120 and the other side facing the long side of another battery cell 120.

In addition, the insulating spacer 130 and the long side surface of the battery cell 120 may be spaced apart by a second separation distance, which is a predetermined distance, to form an external air passage. Here, by the external air passage, the battery cell 120 may be cooled by external air.

The insulating spacer 130 may include a sheet portion 131 and an edge portion 132. When a fire occurs in the battery cell 120, the sheet portion 131 may be used by mixing a sheet having flame retardancy or non-flammability to prevent the fire from spreading and an insulating sheet to prevent heat from spreading. In more detail, the sheet portion 131 includes a first sheet 131a having heat insulating properties, and two second sheets having flame retardancy or non-flammability attached to both sides of the first sheet 131a through an adhesive member 131c, respectively. It may include a sheet (131b). In this way, the sheet portion 131 may increase not only flame retardancy and non-flammability, but also heat insulation effect by stacking the first sheet 131a and the second sheet 131b in multiple layers. That is, when the temperature of the battery cell 120 is increased and a flame is generated through the sheet portion 131 in which a plurality of sheets are stacked, the insulating spacer 130 transmits heat or flame to the adjacent battery cell 120. It can be prevented from being transmitted.

Such an insulating spacer 130 may be used by mixing a flame-retardant or non-flammable sheet to prevent flame from spreading and an insulating sheet to prevent heat from spreading when a fire occurs in the battery cell 120, such an insulating spacer The configuration of (130) will be described later.

Here, the first sheet 131a and the second sheet 131b may have the same size. If the thickness of the insulating spacer 130 does not exceed 50% of the first separation distance, it may be easier to move the extinguishing agent to be described later. For example, when the first separation distance is 6mm, the thickness of the insulating spacer 130 is preferably not more than 3mm, and when the first separation distance is 4mm, it is preferable not to exceed 2mm. For example, the first sheet 131a may be any one of 1mm to 1.4mm. In addition, the second sheet 131b may be any one of 0.1mm to 0.2mm. In addition, the adhesive member 131c may be 0.1mm.

For example, ceramic paper may be used for the first sheet 131a, and mica may be used for the second sheet 131b. In addition, the first sheet 131a may further include an airgel, and when the airgel is included, a large air layer may be secured, thereby improving thermal insulation performance. In addition, the first sheet 131a may be a ceramic paper of a refractory insulating material including fibers. In addition, the first sheet (131a) is a ceramic fiber ceramic paper containing an alkaline earth metal (Bio-soluble fiber ceramic paper), it may be an environmentally friendly high-temperature fire-resistant insulating material harmless to the human body.

In addition, the seat portion 131 may include the configuration shown in FIG. 14A or 14B.

The adhesive member 131c is interposed between the second sheet 131b so as to have a predetermined width from both ends of the first sheet 131a, as shown in FIGS. 14A and 14, It is possible to attach between the sheets (131b). In addition, the adhesive member 131c may have the same length as the length direction of the first sheet 131a and the second sheet 131b. That is, both end portions x1 of the first sheet 131a may be adhered to both end portions x1 of the second sheet 131b by the adhesive member 131c.

The adhesive member 131c may have a width of 10 mm to 20 mmm. Here, if the width of the adhesive member 131c is less than 10mm, adhesion between the first sheet 131a and the second sheet 131b may not be easy, and if it exceeds 20mm, the probability of ignition by the adhesive member increases. Can be.

In addition, the adhesive member 131c may use any one of an adhesive having various adhesive components such as a general double-sided tape and an adhesive, and the component of the adhesive member 131c is not limited in the present invention.

Since the adhesive member 131c attaches only both end portions x1 of the sheet portion 131, the central portion x2 between the first sheet 131a and the second sheet 131b may be spaced apart from each other. Accordingly, an air passage 131d may be formed between the first sheet 131a and the second sheet 131b. In addition, when the battery cell 120 swells due to swelling, the seat portion 131 may reduce the compression rate due to the air flow path 131d of the central portion x2.

In addition, as shown in FIG. 14B, the sheet portion 131 has an adhesive member 131c formed in a predetermined area from the upper and lower ends of the first sheet 131a, so that the first sheet 131a and the second sheet 131b Can be attached between. In addition, the adhesive member 131c may have the same width as the width direction of the first sheet 131a and the second sheet 131b. That is, the upper and lower ends of the first sheet 131a may be adhered to the upper and lower ends of the second sheet 131b by the adhesive member 131c.

When the size of the sheet portion 131 in the width direction is less than twice the size in the height direction, as shown in Fig. 14A, it is okay to attach adhesive members 131c to both ends, but the size in the width direction is the size in the height direction. When the adhesive member (131c) is attached to both ends when it is twice as large as compared to, since the adhesive area is reduced compared to the area of the sheet portion, the adhesive performance may be deteriorated.

Accordingly, when the size of the sheet portion 131 is twice or more than the size in the height direction, the sheet portion 131 may be attached to the upper and lower ends with the adhesive member 131c to increase the bonding area, thereby improving adhesion performance. The configuration of the sheet portion 131 may be the same as that of the sheet portion 131 shown in FIGS. 14A and 15 except for the attachment position of the adhesive member 131c.

However, when the upper and lower ends of the sheet part 131 are attached by the adhesive member 131c, the adhesion performance is improved, so it is not necessary to form a separate edge part 132.

In addition, in the case of the edge portion 132, it may be formed along the edge of the sheet portion 131. The rim portion 132 may be formed of a plastic material, and is coupled to the rim of the sheet portion 131 through double injection, thereby fixing the shape of the sheet portion 131. For example, the rim portion 132 may be made of conventional polyethylene or polypropylene. Preferably, the width of the edge portion 132 may have a width of 3mm to 6mm. Here, when the width of the edge portion 132 is less than 3mm, it may not be easy to fix the seat portion 131, and when it exceeds 6mm, the combustion probability of the edge portion 132 made of plastic may increase.

Meanwhile, as mentioned above, when the extinguishing chemical is applied from the upper portion of the insulating spacer 130, it may move downward along the surface of the sheet portion 131. Therefore, the extinguishing chemical liquid comes into contact with the case 121 of the battery cell 120, and thus, the extinguishing of the battery cell 120 as well as the cooling function can be performed. Hereinafter, the movement of the digestive liquid will be described in more detail.

As shown in FIG. 14, open holes 143 may be further formed in the upper plate 140 at positions corresponding to the insulating spacers 130. Accordingly, the extinguishing chemical liquid generated in the extinguishing sheet 150 may pass through the upper plate 140 through the open hole 143 of the upper plate 140 and reach the insulating spacer 130. In addition, the extinguishing chemical liquid moves along the surface of the insulating spacer 130, and thus faces the case 121 of the battery cell 120, thereby extinguishing and cooling the battery cell 120. In this case, since the extinguishing chemical liquid is sprayed from the extinguishing sheet 150 corresponding to the temperature of the battery cells 120 or higher than the standard, the extinguishing chemical liquid may be sprayed from the top of the battery cell 120 whose temperature is increased. In addition, since the extinguishing chemical liquid is located along the surface of the insulating spacer 130 located before and after the corresponding battery cell 120, the extinguishing and cooling of the corresponding battery cell 120 can be performed together.

Hereinafter, a configuration of an energy storage module according to another embodiment of the present invention will be described.

17 is a perspective view of an energy storage module according to another embodiment of the present invention. 18 is a bottom perspective view of an energy storage module according to another embodiment of the present invention. 19 is a cross-sectional view taken along line E-E in FIG. 17. 20 is a perspective view illustrating a state in which a battery cell and an insulating spacer are disposed on a cover member in an energy storage module according to another embodiment of the present invention.

17 to 20, the energy storage module 200 according to another embodiment of the present invention includes a cover member 210, a battery cell 120, an insulating spacer 230, an upper plate 240, and a fire extinguishing sheet. A configuration of 250 and an upper cover 260 may be included.

Here, the configuration of the cover member 210, the upper plate 240, the fire extinguishing sheet 250, and the upper cover 260 may be formed similar to the energy storage module 100 according to the above-described embodiment. In addition, the configuration of the battery cell 120 may be the same as the energy storage module 100 according to the above-described embodiment. Hereinafter, among the energy storage modules 200, a configuration different from that of the energy storage module 100 will be mainly described.

First, the cover member 210 includes a lower plate 211, an end plate 212, and a side plate 213, through which a space in which the battery cells 120 and the insulating spacers 230 are alternately disposed is provided. Can be equipped. In addition, the cover member 210 may fix the positions of the battery cells 120 and the insulating spacers 230 and protect the battery cells 120 from external impacts. In addition, the lower plate 211 may be further provided with a through hole 211a for discharging the extinguishing chemical solution of the extinguishing sheet 250 and discharging the air that has moved along the outer surface of the insulating spacer 230. The through hole 211a may be located at a position corresponding to the insulating spacer 230.

The insulating spacer 230 is interposed between the battery cells 120 to prevent the battery cells 120 from contacting each other, thereby maintaining electrical independence. The insulating spacer 230 may have a planar size that covers both long side surfaces of the two battery cells 120 whose short sides face each other. That is, one insulating spacer 230 may be interposed between four battery cells 120 disposed so that their long sides face each other. In addition, a predetermined gap is maintained between the insulating spacer 230 and the battery cell 120 to provide a passage for external air or a passage for moving the extinguishing chemical solution so that the battery cell 120 is cooled. Such an insulating spacer 230 may be used by mixing a flame-retardant or non-flammable sheet to prevent flame from spreading and an insulating sheet to prevent heat from spreading when a fire occurs in the battery cell 120, such an insulating spacer The configuration of 230 will be described later.

The upper plate 240 may be coupled to the upper portion of the cover member 210. The upper plate 240 may be coupled to the cover member 210 while covering the upper portion of the battery cell 120.

Meanwhile, the upper plate 240 includes a duct 241 corresponding to the vents 124a formed on the upper surfaces of the plurality of battery cells 120. A plurality of such ducts 241 may be arranged along one direction, for example, a length direction. Accordingly, the gas discharged by operating the vent 124a of the battery cell 120 may move upward along the duct 241 of the upper plate 240. The specific structure and operation of the duct 241 will be described later.

The fire extinguishing sheet 250 is located between the upper plate 240 and the upper cover 260. The fire extinguishing sheet 250 may be mounted on both sides of the duct 241 of the upper plate 240 in the shape of a flat sheet extending along the longitudinal direction and on the lower surface 260b of the upper cover 260. Here, the longitudinal direction may be a direction in which the plurality of ducts 241 of the upper plate 240 extend.

The upper cover 260 is coupled to the upper portion of the upper plate 240. The upper cover 260 may cover the upper plate 240 and the fire extinguishing sheet 250 to protect them from an impact applied from the upper surface 260a of the upper cover 260. In addition, the upper cover 260 may include a discharge hole 261. In addition, the upper cover 260 may further include a protrusion 262 spaced apart from the outer periphery of the discharge hole 261 and protruding downward. The duct 241 may be coupled to the inside of the protrusion 262 of the protrusion 262. The discharge holes 261 may be formed by arranging a plurality of discharge holes 261 along one direction, for example, a length direction of the upper cover 260. In addition, the discharge hole 261 may be formed at a position corresponding to the duct 241 of the upper plate 240. In addition, the discharge hole 261 may also be provided in the form of a hole penetrating between the upper surface and the lower surface so as to be spaced apart from each other like the duct 241. Accordingly, the gas discharged by operating the vent 124a of the battery cell 120 may be discharged to the outside along the duct 241 of the upper plate 240 and the discharge hole 261 of the upper cover 260. have.

In addition, the upper cover 160 may be further provided with a through hole 263 for discharging the extinguishing chemical solution of the extinguishing sheet 250 and discharging the air that has moved along the outer surface of the insulating spacer 230. The through hole 263 may be located at a position corresponding to the insulating spacer 230.

In addition, in the longitudinal direction in which the discharge hole 261 is formed in the upper cover 260, the corresponding region may have a recess 265 having a lower height than other regions. Through this configuration, the gas discharged through the duct 241 and the discharge hole 261 may be collected in the concave portion 265. On the other hand, it is possible to discharge the gas generated in the battery cell early by allowing the collected gas to be discharged to the outside through a separate fan or suction structure.

Hereinafter, the structure and operation of the battery cell 120 and the insulating spacer 130 in the energy storage module according to another embodiment of the present invention will be described.

21A and 21B are perspective and exploded perspective views illustrating a configuration of an insulating spacer in an energy storage module according to another embodiment of the present invention. 22 is a cross-sectional perspective view taken along line F-F of FIG. 17.

The battery cells 120 may be disposed alternately with the insulating spacer 230 on the upper surface of the lower plate 211 of the cover member 210. In this case, the insulating spacer 230 may have a planar size that covers both long side surfaces of the two battery cells 120 whose short sides are opposite to each other. Here, one insulating spacer 230 may cover both long side surfaces of the two battery cells 120, and the other side may also cover both long side surfaces of the two battery cells 120. That is, the insulating spacer 230 may be interposed between four battery cells 120 disposed so that their long sides face each other.

In addition, the long side surfaces of the battery cells 120 may be spaced apart from the long side surfaces of the battery cells 120 facing each other by a predetermined distance, and an insulating spacer 230 may be interposed therebetween.

Here, the first separation distance, which is the separation distance between the long side surfaces of the battery cells 120 facing each other, may be any one of 3.5mm to 4.5mm. Here, when the first separation distance is less than 3.5 mmm, it is not easy to form an air layer between the insulating spacer 230 and the battery cell 120, and cooling performance may be deteriorated. In addition, when the first separation distance exceeds 4.5mm, it may unnecessarily increase the size of the energy storage module 200.

The insulating spacer 230 prevents the battery cells 120 from contacting each other between the battery cells 120, thereby maintaining electrical independence. In addition, the insulating spacer 230 and the long side surface of the battery cell 120 may be spaced apart by a predetermined distance to form an external air passage. Here, the battery cell 120 may allow the external air passage to be cooled by movable external air.

The insulating spacer 230 may be formed only as a sheet without a separate edge portion configuration. When a fire occurs in the battery cell 120, the insulating spacer 230 may be used by mixing a sheet having flame retardancy or non-combustibility to prevent the fire from spreading and an insulating sheet to prevent heat from spreading. In more detail, the sheet portion 231 includes a first sheet 231a having heat insulating properties and two second sheets having flame retardancy or non-flammability attached to both sides of the first sheet 231a through an adhesive member 231c, respectively. It may include a sheet (231b). Here, the first sheet 231a and the second sheet 231b may have the same size. If the thickness of the insulating spacer 230 does not exceed 50% of the first separation distance, it may be easy to move the extinguishing agent to be described later.

The first sheet 231a is interposed between the second sheets 231b so as to have a predetermined length from the upper and lower ends of the first sheet 231a, so that between the first sheet 231a and the second sheet 231b may be attached. In addition, the adhesive member 231c may have the same width as the width direction of the first sheet 231a and the second sheet 231b. That is, the upper and lower ends of the first sheet 231a may be adhered to the upper and lower ends of the second sheet 231b by the adhesive member 231c.

Here, when the size of the sheet part 231 is two or more times larger than the size in the height direction, the sheet part 231 may be attached to the upper and lower ends with an adhesive member 231c to improve adhesion performance. That is, when the size of the sheet part 231 is more than twice as large as the size in the height direction, as shown in Fig. 14A, the sheet part 231 is adhered to both ends of the sheet part 131 with adhesive members 131c. Performance may be degraded. The configuration of the insulating spacer 230 may be the same as that of the sheet portion 231 shown in FIG. 14B.

Meanwhile, as mentioned above, when the extinguishing chemical liquid is applied from the upper portion of the insulating spacer 230, it may move downward along the surface of the sheet portion 231. Therefore, the extinguishing chemical liquid comes into contact with the case 121 of the battery cell 120, and thus, the extinguishing of the battery cell 120 as well as the cooling function can be performed. Hereinafter, the movement of the extinguishing chemical and cooling through air will be described in more detail.

As shown in FIG. 20, open holes 243 may be further formed in the upper plate 240 at positions corresponding to the insulating spacers 230. Accordingly, the extinguishing chemical liquid generated in the extinguishing sheet 250 may pass through the upper plate 240 through the open hole 243 of the upper plate 240 and reach the insulating spacer 230. In addition, the extinguishing chemical liquid moves along the surface of the insulating spacer 230 and thus faces the case 121 of the battery cell 120, thereby extinguishing and cooling the battery cell 120. In this case, since the extinguishing chemical liquid is sprayed from the extinguishing sheet 250 corresponding to the temperature of the battery cells 120 or higher than the reference, the extinguishing chemical may be sprayed from the top of the battery cell 120 whose temperature is increased. In addition, since the extinguishing chemical liquid is located along the surface of the insulating spacer 230 located before and after the corresponding battery cell 120, the extinguishing and cooling of the corresponding battery cell 120 can be performed together.

In addition, the upper cover 260 may further include a through hole 263 penetrating between the upper surface and the lower surface at a position corresponding to the open hole 243 of the upper plate 240. That is, the through hole 263 may be provided at a position corresponding to the insulating spacer 230.

In addition, a through hole 211a may be further provided in the lower plate 211 of the cover member 210 at a position corresponding to the insulating spacer 230. That is, the air introduced through the through hole 263 of the upper cover 260 and the open hole 243 of the upper plate 240 moves along the spaced space between the insulating spacer 230 and the battery cell 120 Thus, it may be discharged through the through hole 211a of the lower plate 211. Of course, air can move vice versa. As described above, a flow path for air is formed through the through holes 211a and 263 and the open holes 243, so that cooling efficiency may be improved.

Hereinafter, the configuration of the battery cell 120 used in the energy storage module 100 according to an embodiment of the present invention and the energy storage module 200 according to another embodiment will be described in detail.

21A and 21B are perspective and cross-sectional views of a battery cell used in an energy storage module according to an embodiment of the present invention.

21A and 21B, the battery cell 120 has a shape in which the electrode assembly 125 is accommodated in the case 121 and the cap plate 124 covers the upper portion of the case 121. In addition, a vent 124a formed to have a thinner thickness compared to other regions may be formed at approximately the center of the cap plate 124. It has been described above that the duct 141 of the upper plate 140 is disposed corresponding to the upper portion of the vent 124a.

In addition, the electrode assembly 125 may be electrically connected to the first electrode terminal 122 and the second electrode terminal 123 on the cap plate 124 through a pair of current collectors 126. Hereinafter, for convenience, the first electrode terminal 122 is described as a negative terminal and the second electrode terminal 123 is described as a positive terminal, but the polarity may be reversed.

The electrode assembly 125 may include a cathode 125a, an anode 125b disposed opposite to the cathode 125a, and a separator 125c disposed between the cathode 125a and the anode 125b, and an electrolyte solution It may be accommodated in the case 121 together with (not shown).

What has been described above is only one embodiment for implementing the secondary battery according to the present invention, and the present invention is not limited to the above embodiment, and departs from the gist of the present invention as claimed in the following claims. Without it, anyone of ordinary skill in the field to which the present invention pertains will have the technical spirit of the present invention to the extent that various modifications can be implemented.

100, 200; Energy storage modules 110 and 210; Cover member
120; Battery cell 230; Insulation spacer
131; Seat portion 132; Border
140,240: upper plate 141,241: duct
150: fire extinguishing sheet 160, 260: upper cover
161, 261: exhaust hole 161a, 262: exhaust area
162, 263: protrusion 163: slope

Claims (14)

A plurality of battery cells arranged along the length direction such that the long sides face each other;
A plurality of insulating spacers interposed between long side surfaces of the plurality of battery cells;
A cover member having an accommodation space therein and accommodating the plurality of battery cells and the plurality of insulating spacers;
A duct coupled to an upper portion of the cover member and formed at a position corresponding to the vents of the plurality of battery cells, and an upper plate having an open hole at a position corresponding to the insulating spacer;
An upper cover coupled to an upper portion of the upper plate and including a discharge hole at a position corresponding to the duct; And
It is located between the upper cover and the upper plate and comprises a fire extinguishing sheet for extinguishing a fire extinguishing agent at a predetermined temperature or higher,
A protrusion that surrounds the exhaust area and is coupled to the outside of the duct is further provided on a lower surface of the upper cover,
The insulating spacer is an energy storage module, characterized in that a first sheet having flame retardancy or non-flammability and a second sheet having heat insulating properties are attached to both surfaces of the first sheet through an adhesive, respectively. The method of claim 1,
The first sheet is a ceramic paper, and the second sheet is an energy storage module, characterized in that the MICA. The method of claim 2,
The first sheet is an energy storage module, characterized in that the ceramic fiber containing an alkaline earth metal. The method of claim 1,
The plurality of battery cells are spaced apart from each other by a first separation distance between opposite long sides,
The energy storage module, characterized in that the thickness of the insulating spacer is less than 50% of the first separation distance. The method of claim 1,
The energy storage module, wherein the extinguishing agent sprayed from the extinguishing sheet is applied to a space spaced apart from the insulating spacer and the battery cell through the open hole, and contacts the long side surface of the battery cell. The method of claim 1,
The insulating spacer has a size in the width direction smaller than twice the size in the height direction,
The energy storage module, characterized in that the first sheet and the second sheet include sheet portions at both ends of which are bonded by an adhesive. The method of claim 6,
The insulating spacer further comprises an edge portion of a plastic material formed by insert injection so as to surround the edge of the seat portion. The method of claim 6,
The first sheet and the second sheet are spaced apart from each other at a central portion, the energy storage module, characterized in that provided with an air passage through which air can be moved. The method of claim 1,
The insulating spacer has a size in the width direction greater than twice the size in the height direction,
An energy storage module, wherein a predetermined region of the first sheet and the second sheet is adhered from upper and lower ends by an adhesive. The method of claim 1,
The energy storage module, wherein the upper cover further includes an inclined portion whose thickness increases from the exhaust area toward the protrusion. The method of claim 10,
The energy storage module, characterized in that the upper end of the duct is located below the inclined portion. The method of claim 1,
A space is formed between the duct and the protrusion,
Some of the gas discharged from the vent passes through the duct and is discharged to the spaced space through the inclined part. The method of claim 1,
The energy storage module, characterized in that the inner diameter of the duct decreases from the bottom to the top. The method of claim 1,
The energy storage module, characterized in that the area of the plurality of discharge holes is set to be greater than 30% of the area of the exhaust area.

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