Battery pack fire extinguisher

Abstract

The invention discloses a battery pack fire extinguisher. The battery pack fire extinguisher comprises a plurality of battery cells; a bottom case accommodating the battery cells; a top case coupled to the bottom case; and a fire extinguishing capsule attached to the top case and including a fire extinguishing agent sheet embedded therein. The fire extinguishing capsule includes: an injection portion having an injection hole for ejecting a fire extinguishing agent from a fire extinguishing agent sheet toward the battery cell; and a guide portion protruding beyond the injection portion toward the battery cell around the injection portion.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure relate to a battery fire extinguisher. Background Art

[0002] Currently, when a fire occurs due to, for example, an accident or battery failure in an electric vehicle, a barrier is installed around the burning vehicle and is injected with water to cool the battery and extinguish the fire.

[0003] Therefore, before the fire truck arrives, early fire extinguishing response is difficult, and extinguishing battery fires requires a lot of time and a lot of water. In addition, because the fire extinguishing water is sprayed from the outside of the electric vehicle, the fire extinguishing efficiency is very low.

[0004] An electric vehicle or energy storage system includes a battery pack. When a fire occurs in one battery cell of the battery pack during operation, it is ideal that the flame is extinguished to prevent the fire from spreading to other surrounding battery cells. Summary of the Invention

[0005] Embodiments of the present disclosure provide a battery pack fire extinguisher that prevents fire by blocking the spread of flames to surrounding battery cells when a fire occurs in one battery cell.

[0006] Embodiments of the present disclosure provide a battery pack fire extinguisher that effectively causes ignition of a fire extinguishing agent by directing flames to the fire extinguishing agent having a built-in fire extinguishing function.

[0007] According to an embodiment of the present disclosure, a battery pack fire extinguisher includes: a plurality of battery cells; a bottom case housing the battery cells; a top case coupled to the bottom case; and a fire extinguishing capsule attached to the top case and including a fire extinguishing agent tablet embedded therein. The fire extinguishing capsule includes an injection portion having an injection hole for injecting fire extinguishing agent from the fire extinguishing agent tablet toward the battery cells, and a guide portion protruding beyond the injection portion toward the battery cells.

[0008] The battery cells may be cylindrical rechargeable batteries.

[0009] The fire extinguishing capsule may include a back plate spaced apart from the injection portion and connected to the guide portion.

[0010] The fire suppressant tablet may be attached to the inside of the injection portion with a first impact pad therebetween.

[0011] The fire suppressant tablet may be attached to the backing plate with a second impact pad therebetween on the inner surface of the backing plate.

[0012] The injection portion may be circular, and the guide portion may have a circular strip shape having a width in a diameter direction of the injection portion at an outer side of the injection portion and parallel to the back plate.

[0013] The injection portion may have a quadrangular shape, and the guide portion may have a quadrangular stripe shape having a width at an outer side of the injection portion and being parallel to the back plate.

[0014] The injection portion may have a circular injection hole or a slot-shaped injection hole.

[0015] The fire extinguishing capsule may comprise aluminum.

[0016] The injection portion may have a circular shape, and the guide portion may have an inclined surface having a width in a diameter direction of the injection portion at an outer side of the injection portion and forming an angle with respect to the back plate.

[0017] The injection portion may have a quadrangular shape, and the guide portion may have an inclined surface having a width at an outer side of the injection portion and forming an angle with respect to the back plate.

[0018] The injection portion may have a circular shape, and the guide portion may have a concave curved surface curved toward a center of the injection portion, have a width in a diameter direction of the injection portion at an outer side of the injection portion, and form an angle with respect to the back plate.

[0019] The injection portion may have a quadrilateral shape, and the guide portion may have a concave curved surface curved toward a center of the injection portion, have a width at an outer side of the injection portion, and form an angle with respect to the back plate.

[0020] One fire extinguishing capsule may be arranged for each of a plurality of battery cells.

[0021] According to an embodiment of the present disclosure, a fire extinguishing capsule embedded with a fire extinguishing agent tablet is installed in (or on) the top case, and the flame from the battery cell is guided by the guide portion through the injection portion to the fire extinguishing capsule to ignite the fire extinguishing agent tablet, thereby extinguishing the flame of the battery cell by using smoke generated by the fire extinguishing agent.

[0022] Therefore, when a fire occurs in a battery cell, embodiments of the present disclosure can prevent the fire from engulfing the entire battery pack by preventing the flames from spreading to surrounding battery cells. Furthermore, embodiments of the present disclosure can quickly ignite the fire extinguishing agent by directing the flames along the guide portion directly to the fire extinguishing agent, thereby effectively preventing the fire from engulfing the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1is a top plan view of a battery fire extinguisher according to an embodiment of the present disclosure.

[0024] Figure 2 It is along Figure 1 A cross-sectional view taken along line II-II in FIG.

[0025] Figure 3 yes Figure 2 A cross-sectional view of a fire extinguishing capsule with a fire extinguishing agent tablet embedded therein is shown.

[0026] Figure 4 yes Figure 3 A bottom view of the fire extinguishing capsule is shown.

[0027] Figure 5 According to another embodiment Figure 3 A bottom view of the fire extinguishing capsule is shown.

[0028] Figure 6 is a cross-sectional view of a battery fire extinguisher according to another embodiment of the present disclosure.

[0029] Figure 7 is a cross-sectional view of a battery fire extinguisher according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways, all without departing from the scope of the present disclosure. The drawings and description are to be regarded as illustrative rather than restrictive in nature.

[0031] It will be understood that when an element or layer is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it can be directly on, directly connected to, or coupled to the other element or layer, or one or more intervening elements or layers may be present. When an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers. For example, when a first element is described as being “coupled to” or “coupled to” a second element, the first element can be directly coupled to or coupled to the second element, or the first element can be indirectly coupled to or coupled to the second element via one or more intervening elements.

[0032] In the drawings, for clarity of illustration, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals represent the same elements. As used herein, the term "and / or" includes any and all combinations of one or more related listed items. In addition, when describing the embodiments of the present disclosure, the use of "may" relates to "one or more embodiments of the present disclosure." Expressions such as "at least one of..." and "any of...", when following a list of elements, modify the entire list of elements without modifying the individual elements in that list. For example, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof. As used herein, the terms "use," "use...", and "being used" can be considered to be synonymous with the terms "utilize," "utilize...", and "being utilized," respectively. As used herein, the terms "substantially," "about," and similar terms are used as approximate terms rather than terms of degree, and are intended to explain the inherent deviations of measured or calculated values ​​that a person of ordinary skill in the art would recognize.

[0033] It will be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0034] For ease of description, spatial relational terms such as "under," "beneath," "below," "above," "on," etc. may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It will be understood that the spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, an element described as "under" or "beneath" another element or feature will be oriented "above" or "above" the other element or feature. Thus, the term "under" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relational descriptors used herein should be interpreted accordingly.

[0035] The terms used herein are for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, the singular form "a" and "an" are also intended to include the plural form, unless the context clearly indicates otherwise. It will be further understood that when used in this specification, the terms "comprises," "comprising," "including," and / or "comprising" indicate the presence of stated features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups thereof.

[0036] In view of the overall disclosure, those skilled in the art will understand that each suitable feature of the various embodiments of the present disclosure may be combined in part or in whole or in combination with each other, and may be technically linked and operated in various suitable manners, and unless otherwise specified or implied, each embodiment may be implemented independently of each other or in combination with each other in any suitable manner.

[0037] In addition, any numerical range disclosed and / or described herein is intended to include all subranges of the same numerical precision that fall within the described range. For example, a range of "1.0 to 10.0" is intended to include all subranges between (and including) the described minimum value of 1.0 and the described maximum value of 10.0, that is, all subranges having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits that fall within it, and any minimum numerical limit described in this specification is intended to include all higher numerical limits that fall within it. Therefore, the applicant reserves the right to amend this specification (including the claims) to explicitly describe any subranges that fall within the ranges explicitly described herein.

[0038] When a fire occurs in a single battery cell in a battery pack comprising multiple battery cells, a fire extinguishing capsule containing (or containing) a fire extinguishing agent is used to extinguish the flames and prevent the fire from spreading to other battery cells in the battery pack. The fire extinguishing capsule extinguishes the flames caused by the fire in the battery pack. The fire extinguishing capsule embedded in the battery pack prevents or at least mitigates the spread of the fire by extinguishing the flames in the shortest possible time.

[0039] Pouch-type, square, or round battery cells can be used in a battery pack. The following embodiments illustrate a battery pack using round battery cells as an example. To prevent chain fires among battery cells, the battery pack includes a fire extinguishing capsule containing a fire extinguishing agent.

[0040] The fire extinguishing capsule is installed in a structure that takes into account the operating characteristics of the upper part of the battery cell, which is a common fire source. The fire extinguishing capsule is burned by the flame of the burning battery cell to generate smoke, and the smoke extinguishes the flame of the battery cell.

[0041] Figure 1 is a top plan view of a battery fire extinguisher according to an embodiment of the present disclosure, Figure 2 It is along Figure 1 A cross-sectional view taken along line II-II in FIG. Figure 1 and Figure 2 The battery fire extinguisher 1 includes a plurality of battery cells 10, a bottom case 20 accommodating the battery cells 10, a top case 30 coupled to the bottom case 20, and a fire extinguishing agent sheet 50 attached to the top case 30 and embedded therein (see, for example Figure 3 ) of fire extinguishing capsule 40.

[0042] As an example, the battery cell 10 is a cylindrical rechargeable battery. The embodiment shown is a configuration including seven battery cells 10 and one fire extinguishing capsule 40. When seven battery cells 10 and one fire extinguishing capsule 40 are used as a unit pack UP, the embodiment shown is a configuration including one unit pack UP. However, the battery pack fire extinguisher 1 can be configured by Figure 1 The unit groups UP are repeatedly arranged in the up-down and left-right directions (eg, horizontal directions) to form.

[0043] The temperature at which the fire extinguishing agent embedded in the fire extinguishing agent tablet 50 ignites (or burns) may be in the range of about 380° C. to about 400° C., and in one embodiment, may be about 390° C. Depending on the structure of the fire extinguishing capsule 40 , the fire extinguishing agent of the fire extinguishing agent tablet 50 may ignite (or burn) when a fire in the battery cell 10 begins (e.g., shortly after the fire ignites).

[0044] Figure 3 yes Figure 2 A cross-sectional view of a fire extinguishing capsule with a fire extinguishing agent tablet embedded therein is shown, Figure 4 yes Figure 3 The fire extinguishing capsule is shown in bottom view. Figure 3 and Figure 4 The fire extinguishing capsule 40 includes an injection portion 41 and a guide portion 42, and may further include a back plate 43. As an example, the fire extinguishing capsule 40 may be formed of aluminum having high thermal conductivity.

[0045] The injection portion 41 has an injection hole 411 for injecting the fire extinguishing agent from the fire extinguishing agent sheet 50 toward the battery cell 10. When the battery cell 10 catches fire, the injection hole 411 allows the flame generated from the battery cell 10 to flow in, so that the flame reaches the fire extinguishing agent sheet 50. In response, the fire extinguishing agent sheet 50 is configured to start a fire and combustion operation due to the ignition heat of the battery cell 10.

[0046] The guide portion 42 protrudes from the outer surface of the injection portion 41 toward the battery cell 10 to a height H. The height H of the guide portion 42 guides the flame generated from the battery cell 10 toward the injection portion 41 so that the flame reaches the extinguishing agent sheet 50 through the injection hole 411 .

[0047] As an example, the fire extinguishing agent sheet 50 is attached to the inner surface of the injection portion 41 via a first anti-impact pad 51 on the inner surface of the injection portion 41. In such an embodiment, the first anti-impact pad 51 may be a PET film with high thermal conductivity, so that it quickly reaches the temperature required to ignite the fire extinguishing agent. Alternatively, the first anti-impact pad 51 may be a sponge to improve vibration and shock absorption.

[0048] The first impact-absorbing pad 51 has a first thickness t1. Therefore, a space S is formed between the inner surface of the injection portion 41 and the fire-extinguishing agent sheet 50. This space S is part of the injection hole 411 (e.g., is open to the injection hole 411) and diffuses the incoming flame, allowing the entire surface of the fire-extinguishing agent sheet 50 to be evenly exposed to the flame. This allows for uniform fire initiation and combustion of the fire-extinguishing agent sheet 50.

[0049] Furthermore, a space formed by the height H of the guide portion 42 on the outer surface of the injection portion 41 temporarily stores the flame flowing into the injection hole 411, thereby enabling uniform flame to flow into the injection hole 411. Therefore, the entire surface of the fire extinguishing agent sheet 50 can be uniformly exposed to the flame, and uniform ignition and combustion operation of the entire fire extinguishing agent sheet 50 is ensured.

[0050] The back plate 43 is spaced apart from the injection portion 41 and connected to the guide portion 42. Therefore, the fire extinguishing capsule 40 may have a space in which the fire extinguishing agent sheet 50 may be embedded. In addition, the back plate 43 is mounted on the inner surface of the top case 30.

[0051] In addition, a second impact pad 52 may be provided between the fire extinguishing agent sheet 50 and the back plate 43. In such an embodiment, the second impact pad 52 may be a PET film having high thermal conductivity to quickly reach a temperature that ignites the fire extinguishing agent.

[0052] Because the second impact pad 52 has (or covers) a wider area than the first impact pad 51 , it can absorb vibrations and shocks more effectively at an area that is more susceptible to vibrations and shocks than the first impact pad 51 .

[0053] Furthermore, the second impact pad 52 has a second thickness t2 that is greater than the first thickness t1 of the first impact pad 51, thereby improving the absorption of vibration and shock transmitted from the top case 30. Therefore, damage to the fire extinguishing agent tablet 50 can be more effectively prevented.

[0054] The injection portion 41 has a circular shape, and the guide portion 42 has a diameter width W1 outside (e.g., around) the injection portion 41. The guide portion 42 is parallel to the back plate 43 and may have circular stripes. As an example, the injection hole 411 in the injection portion 41 may have a circular shape.

[0055] The injection hole 411 allows the flame generated from the battery cell 10 to flow into the fire extinguishing agent sheet 50 so that the fire extinguishing agent stably burns and smoke is stably discharged to extinguish the flame. For example, the injection hole 411 has a size that prevents the fire extinguishing agent from burning and falling from the fire extinguishing agent sheet 50.

[0056] Figure 5 According to another embodiment Figure 3 The bottom view of the fire extinguishing capsule is shown in . Figure 5 In the fire extinguishing capsule 240, the injection portion 241 has a quadrilateral shape, and the guide portion 242 has a width W2 outside the injection portion 241, is parallel to the back plate 43, and can have a quadrilateral band shape. As an example, the injection hole 412 in the injection portion 241 can have a groove shape.

[0057] When the diameter of the circular injection hole 411 and the width of the slot-type injection hole 412 are the same, the slot-type injection hole 412 provides a larger reaching area for the flame to reach the fire extinguishing agent sheet 50 compared to the circular injection hole 411, thereby starting the ignition of the fire extinguishing agent faster.

[0058] When the diameter of the circular injection hole 411 and the width of the slot-type injection hole 412 are the same, the circular injection hole 411 can more continuously supply the fire extinguishing smoke from the fire extinguishing agent sheet 50 to the battery cell 10 compared to the slot-type injection hole 412 .

[0059] The circular injection hole and the slot-shaped injection hole can be mixed and applied to the injection portion (eg, can exist together in the injection portion). In such an embodiment, the two shapes of the injection hole optimize the shortening of the fire start of the fire extinguishing agent and the extension of the duration of the fire extinguishing smoke.

[0060] Return to reference Figure 3 The injection portion 41 and the guide portion 42 are vertically connected to each other. In the event of a fire in the battery cell 10 , the generated flame is guided by the guide portion 42 toward the injection hole 411 in the injection portion 41 to reach the fire extinguishing agent sheet 50 .

[0061] The fire extinguishing agent tablet 50 is heated by the flames of the ignition, and when it reaches its ignition starting temperature, the fire extinguishing agent in the fire extinguishing agent tablet 50 ignites (e.g., burns) and produces smoke. The smoke is injected into the flames of the burning battery cell 10 through the injection hole 411 in the injection portion 41, causing the flames to be extinguished quickly.

[0062] Therefore, due to the increased capacity of the battery cell 10, even if a fire occurs in the battery cell 10, the flame is prevented from spreading from the battery cell 10 where the fire occurs to the surrounding battery cells 10. That is, according to the embodiment of the present disclosure, a fire caused by the spread of the fire of the battery cell 10 can be prevented.

[0063] Hereinafter, various embodiments of the present disclosure will be described. Compared with the above embodiments, the description of the same or substantially similar parts, components, configurations and features may be omitted or only briefly described, while the description of the differences between them will be mainly described.

[0064] Figure 6 is a cross-sectional view of a battery fire extinguisher according to another embodiment of the present disclosure. Figures 4 to 6 In the fire extinguishing capsule 60 of the battery fire extinguisher 2, the injection portion 61 has a circular shape, and the guide portion 62 has a width W3 in the diameter direction outside (e.g., around) the injection portion 61 and has an inclined surface at an angle θ relative to the back plate 43. The injection portion 61 has a plurality of injection holes 411.

[0065] Reference Figure 5 and Figure 6 In the fire extinguishing capsule 240, the injection portion 241 has a quadrilateral shape, and in the fire extinguishing capsule 60, the guide portion 62 has a width W3 in the diameter direction outside the injection portion 61 and has an inclined surface at an angle θ relative to the back plate 43. The injection portion 61 has a plurality of injection holes 412.

[0066] The injection portion 61 and the guide portion 62 having an inclined surface are connected to each other at an angle of 180°-θ. Therefore, in the event of a fire in the battery cell 10, the generated flame is more smoothly guided by the guide portion 62 to the injection hole 411 or 412 of the injection portion 61 and reaches the fire extinguishing agent sheet 50.

[0067] Because the angle θ is an acute angle, the injection portion 61 and the guide portion 62 are connected at an obtuse angle to more effectively induce flames into the injection portion 61. Compared to the above-described embodiment in which the injection portion 41 and the guide portion 42 are connected at a right angle, connecting the injection portion 61 and the guide portion 62 with obtusely angled inclined surfaces effectively induces flames into the fire extinguishing agent sheet 50.

[0068] That is, the above embodiment can generate a flame vortex in the injection portion 41 and the guide portion 42, which are connected at a right angle, while the present embodiment avoids the flame vortex in the injection portion 61 and the guide portion 62 because the injection portion 61 and the guide portion 62 are connected at an inclination of 180°-θ.

[0069] The extinguishing agent sheet 50 is heated by the flame, and when it reaches its ignition temperature, the extinguishing agent in the extinguishing agent sheet 50 starts to ignite and produces smoke. The smoke is supplied to the flame of the burning battery cell 10 through the injection hole 411 or 412 in the injection portion 61, causing the flame to be extinguished quickly.

[0070] Therefore, due to the increased capacity of the battery cells 10, even if a fire occurs in the battery cells 10, flames are prevented from spreading from the burning battery cells 10 to surrounding battery cells 10. For example, a fire caused by the spread of fire in the battery cells 10 can be prevented.

[0071] Figure 7 is a cross-sectional view of a battery fire extinguisher according to another embodiment of the present disclosure. Figures 4 to 7 In the fire extinguishing capsule 70 of the battery fire extinguisher 3, the injection portion 71 has a circular shape, and the guide portion 72 has a width W4 in the diameter direction outside (e.g., around) the injection portion 71 and has a curved surface having a concave curvature with a radius R toward the center of the injection portion 71 while forming an angle θ2 relative to the back plate 43. The injection portion 71 has a plurality of injection holes 411.

[0072] Reference Figures 5 to 7 In the fire extinguishing capsule 240, the injection portion 241 has a quadrilateral shape, and in the fire extinguishing capsule 70, the guide portion 72 has a width W4 in the diameter direction outside the injection portion 71 and has a curved surface having a concave curvature toward the center of the injection portion 71 while forming an angle θ2 relative to the back plate 43.

[0073] The injection portion 71 has a plurality of injection holes 411 .

[0074] The guide portion 72 is formed as a curved surface having a concave curvature toward the center of the injection portion 71 and is connected to the injection portion 71. Therefore, in the event of a fire in the battery cell 10, the generated flame is guided by the guide portion 72 to the injection hole 411 or 412 in the injection portion 71 to reach the fire extinguishing agent sheet 50.

[0075] Because the angle θ2 is formed as an acute angle, the injection portion 71 and the guide portion 72 are connected at an obtuse angle and form a curved surface with a concave curvature, thereby achieving more effective flame guidance and induction. Compared with the structure of the above-mentioned embodiment in which the injection portion 61 and the guide portion 62 are connected at an oblique angle θ, in the illustrated embodiment, the concave curved surface and its connection with the injection portion can effectively induce flames to the fire extinguishing agent sheet 50.

[0076] For example, although in the above-described embodiment, flame initiation can be caused (or guided) by the injection portion 61 and the guide portion 62, wherein the injection portion 61 and the guide portion 62 are connected at an angle θ, in the present embodiment, flame initiation can be more effectively generated in the injection portion 71 and the guide portion 72, wherein the injection portion 71 and the guide portion 72 are formed with curved surfaces of concave curvature and are connected at an angle θ2.

[0077] The extinguishing agent sheet 50 is heated by the flame, and when it reaches its fire starting temperature, the extinguishing agent in the extinguishing agent sheet 50 begins to generate smoke. The smoke is supplied to the flame of the burning battery cell 10 through the injection hole 411 or 412 in the injection portion 71, causing the flame to be extinguished quickly.

[0078] Therefore, due to the increased capacity of the battery cells 10, even if a fire occurs in the battery cells 10, the fire is prevented from spreading from the battery cells 10 to surrounding battery cells 10. For example, a fire caused by the spread of the fire in the battery cells 10 can be prevented.

[0079] Although the embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present disclosure defined in the appended claims and their equivalents also belong to the scope of the present disclosure.

[0080] Description of some reference numerals

[0081] 1, 2, 3: Battery fire extinguisher 10: Battery cell

[0082] 20: bottom shell 30: top shell

[0083] 40: Fire extinguishing capsule 41: Injection part

[0084] 42: Guide part 43: Back plate

[0085] 50: Fire extinguishing agent tablet 51: First impact pad

[0086] 52: Second impact pad 60: Fire extinguishing capsule

[0087] 61: Injection part 62: Guidance part

[0088] 70: Fire extinguishing capsule 71: Injection part

[0089] 72: Guide Section 240: Fire Extinguishing Capsules

[0090] 241: injection part 242: guidance part

[0091] 411: injection hole 412: injection hole

[0092] H: height S: space

[0093] t1: first thickness t2: second thickness

[0094] UP: Unit group W1: Width

[0095] W2: width W3: width

[0096] W4: width θ: angle

[0097] θ2: angle

Claims

1. A battery fire extinguisher comprising: Multiple battery cells; a bottom shell, accommodating the battery cells; a top shell coupled to the bottom shell; as well as a fire extinguishing capsule attached to the top shell and including a fire extinguishing agent tablet embedded therein, the fire extinguishing capsule comprising: an injection portion having an injection hole for injecting a fire extinguishing agent from the fire extinguishing agent sheet into the battery cell; as well as A guide portion protrudes beyond the injection portion toward the battery cell around the injection portion.

2. The battery fire extinguisher according to claim 1, wherein: The battery cells are cylindrical rechargeable batteries.

3. The battery fire extinguisher according to claim 1, wherein: The fire extinguishing agent sheet is attached to the inner side of the injection portion with a first impact pad therebetween.

4. The battery fire extinguisher according to claim 3, wherein: The fire extinguishing capsule includes a back plate spaced apart from the injection portion and connected to the guide portion, and The fire extinguishing agent sheet is attached to the back plate, and a second anti-impact pad is provided on the inner surface of the back plate between the fire extinguishing agent sheet and the back plate.

5. The battery fire extinguisher according to claim 1, wherein: The fire extinguishing capsule includes a back plate spaced apart from the injection portion and connected to the guide portion.

6. The battery fire extinguisher according to claim 5, wherein: The injection portion is circular, and The guide portion has a circular strip shape, the circular strip shape has a width in a diameter direction of the injection portion outside the injection portion and is parallel to the back plate.

7. The battery fire extinguisher according to claim 5, wherein: The injection portion has a quadrilateral shape, and The guide portion has a quadrilateral strip shape, and the quadrilateral strip shape has a width outside the injection portion and is parallel to the back plate.

8. The battery fire extinguisher according to claim 5, wherein: The injection portion has a circular shape, and The guide portion has an inclined surface and forms an angle with respect to the back plate, and the inclined surface has a width in a diameter direction of the injection portion at an outer side of the injection portion.

9. The battery fire extinguisher according to claim 5, wherein: The injection portion has a quadrilateral shape, and The guide portion has an inclined surface and forms an angle with respect to the back plate, and the inclined surface has a width outside the injection portion.

10. The battery fire extinguisher according to claim 5, wherein: The injection portion is circular in shape, and The guide portion has a concave curved surface curved toward the center of the injection portion, has a width in a diameter direction of the injection portion at an outer side of the injection portion, and forms an angle with respect to the back plate.

11. The battery fire extinguisher according to claim 5, wherein: The injection portion has a quadrilateral shape, and The guide portion has a concave curved surface curved toward the center of the injection portion, has a width in a diameter direction at an outer side of the injection portion, and forms an angle with respect to the back plate.

12. The battery fire extinguisher according to claim 1, wherein: The injection portion has a circular injection hole or a slot-shaped injection hole.

13. The battery fire extinguisher according to claim 1, wherein: The fire extinguishing capsule comprises aluminum.

14. The battery fire extinguisher according to claim 1, wherein: The fire extinguishing capsule is arranged one per a plurality of battery cells.

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