Rechargeable battery pack

Abstract

A rechargeable battery pack includes a plurality of unit cells adjacent to each other, a case having an internal space for accommodating the plurality of unit cells, and a fire extinguishing agent unit spaced apart from the plurality of unit cells in the internal space of the case. The fire extinguishing agent unit is configured to generate a solid aerosol at a reference temperature to extinguish a fire in one or more of the plurality of unit cells.

Description

Technical Field

[0001] Various aspects of embodiments of this disclosure relate to rechargeable battery packs. Background Technology

[0002] Generally speaking, rechargeable batteries are batteries designed to be repeatedly charged and discharged.

[0003] A rechargeable battery pack may include a housing that contains multiple individual cells and multiple individual cells.

[0004] In a conventional secondary battery pack, when one of the multiple cells burns, the adjacent cells also burn due to the flame produced by the burning cell. Utility Model Content

[0005] Embodiments of this disclosure provide a rechargeable battery pack configured to actively extinguish burning cell cells among a plurality of individual cells.

[0006] According to one embodiment of this disclosure, a rechargeable battery pack includes: a plurality of individual cells adjacent to each other; a housing having an internal space for accommodating the plurality of individual cells; and a fire extinguishing agent unit spaced apart from the plurality of individual cells within the internal space of the housing and configured to generate a solid aerosol at a reference temperature. When the internal space of the housing has a known volume, the weight of the fire extinguishing agent unit satisfies Equation 1:

[0007] Y = 0.0088X + 0.211

[0008] Where Y is the unit volumetric weight (g / L) of the extinguishing agent unit in the internal space of the casing, and X is the battery capacity (Wh) of one of the multiple unit cells.

[0009] In Equation 1, X satisfies Equation 2:

[0010] X = V × 6.8 / Z

[0011] Where V is the battery capacity (Wh) of one of the multiple cell units, and Z is the volume (L) of the internal space of the casing.

[0012] When the known volume of the internal space of the shell is 10L, the weight of the extinguishing agent unit can be in the range of 1g to 32g.

[0013] The distance between the extinguishing agent unit and multiple individual units can be in the range of approximately 2 mm to approximately 70 mm.

[0014] The distance between the extinguishing agent unit and multiple unit cells can be in the range of approximately 2 mm to approximately 32 mm.

[0015] The distance between the extinguishing agent unit and multiple individual units can be approximately 20 mm.

[0016] The known volume of the internal space of the shell is approximately 6.8 L.

[0017] The solid aerosols generated by the extinguishing agent unit may include potassium free radicals.

[0018] The extinguishing agent unit may include a mixture containing potassium compounds and resins.

[0019] The extinguishing agent unit may further include a mesh for supporting the mixture.

[0020] The mesh can penetrate the mixture.

[0021] Multiple unit cells may be located on the lower side of the internal space of the housing, and the extinguishing agent unit may be located on the upper side of the internal space of the housing.

[0022] The extinguishing agent unit can be attached to the inner surface of the housing.

[0023] The rechargeable battery pack may include a battery management unit connected to and disposed between multiple individual units and the extinguishing agent unit. The battery management unit may be configured to sense the temperature of each of the multiple individual units and to heat the extinguishing agent unit when the temperature of one of the multiple individual units exceeds a reference temperature.

[0024] The battery management unit may further include a heater attached to the extinguishing agent unit, and the battery management unit may be configured to control the heater to heat the extinguishing agent unit.

[0025] According to one embodiment, a rechargeable battery pack is provided, which is configured to actively extinguish burning cell cells among a plurality of cell cells. Attached Figure Description

[0026] Figure 1 This is a schematic illustration of a rechargeable battery pack according to one embodiment.

[0027] Figure 2 Show Figure 1 An example of a fire extinguishing agent unit is shown in the image.

[0028] Figures 3 to 5 A graph illustrating experimental results of the first fire extinguishing effect in a rechargeable battery pack according to an embodiment, based on the weight of the fire extinguishing agent unit.

[0029] Figures 6 to 8 A graph illustrating experimental results of the first fire extinguishing effect in a rechargeable battery pack according to an embodiment, based on the distance between multiple individual cells and the fire extinguishing agent cells.

[0030] Figure 9 This is a schematic illustration of a rechargeable battery pack according to another embodiment. Detailed Implementation

[0031] The present disclosure will be described more fully below with reference to the accompanying drawings, in which embodiments of the disclosure are illustrated. As those skilled in the art will recognize, the embodiments described herein can be modified in various ways without departing from the scope of the present disclosure.

[0032] It will be understood that when an element or layer is referred to as being "on" another element or layer, "connected to," or "linked to" another element or layer, it may be directly on, connected to, or linked to the other element or layer, or one or more intermediary elements or layers may be present. When an element or layer is referred to as being "directly on" another element or layer, "directly connected to," or "directly linked to" another element or layer, no intermediary element or layer is present. For example, when a first element is described as being "linked" or "connected" to a second element, the first element may be directly linked to or connected to the second element, or the first element may be indirectly linked to or connected to the second element via one or more intermediary elements.

[0033] In the accompanying drawings, the dimensions of various elements, layers, etc., may be enlarged for clarity of illustration. The same reference numerals denote the same elements. As used herein, the term “and / or” includes any and all combinations of one or more of the associated enumerated items. Furthermore, the use of “may” in describing embodiments of this disclosure refers to “one or more embodiments of this disclosure.” Expressions such as “at least one of…” and “any one of…” modify the entire list of elements when preceding / following the list of elements, and do not modify individual elements in the list. For example, the expression “at least one of a, b, and c” indicates only a, only b, only c, both a and b, both a and c, both b and c, all a, b, and c, or variations thereof. As used herein, the terms “use” and “be used” may be considered synonymous with the terms “utilize” and “be exploited,” 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 inherent variations in measured or calculated values ​​that will be recognized by one of ordinary skill in the art.

[0034] It will be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another element, component, area, layer, or segment. Therefore, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment without departing from the teachings of the exemplary embodiments.

[0035] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature and another, as illustrated in the figures. It will be understood that, in addition to the orientation depicted in the figures, the spatial relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element or feature described as “below” or “under” other elements or features will be oriented as “above” or “above” other elements or features. Thus, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise), and the spatial relative descriptors used herein should be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure. As used herein, unless the context clearly indicates otherwise, the singular form “a” is intended to include the plural form as well. It will be further understood that the terms “comprising” and / or “having” as used in this specification indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] Those skilled in the art will recognize that, in view of the overall content of this disclosure, each suitable feature of the various embodiments of this disclosure may be combined in part or in whole or in combination with one another, and may be technically interlocked and operated in various suitable ways, and unless otherwise stated or implied, each embodiment may be implemented independently of one another or in combination with one another in any suitable way.

[0038] Furthermore, any numerical range disclosed and / or set forth herein is intended to include all subranges with the same numerical precision contained within the set forth range. For example, the range “1.0 to 10.0” is intended to include all subranges between the stated minimum value of 1.0 and the stated maximum value of 10.0 (and inclusive), that is, a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit set forth herein is intended to include all lower numerical limits contained herein, and any minimum numerical limit set forth in this specification is intended to include all higher numerical limits contained herein. Therefore, the applicant reserves the right to amend this specification (including the claims) to expressly set forth any subranges contained within the range expressly set forth herein. All such ranges are intended to be described implicitly in this specification such that the range used to expressly set forth any such subrange will be deemed appropriate.

[0039] The following text will refer to Figures 1 to 8A rechargeable battery pack according to an embodiment of the present disclosure is described.

[0040] According to one embodiment, a rechargeable battery pack may include a plurality of individual cells and a housing that accommodates (e.g., is configured to accommodate) the plurality of individual cells. However, the rechargeable battery pack is not limited thereto and may include a plurality of rechargeable battery modules, each of which includes a plurality of individual cells and a housing that accommodates the plurality of individual cells.

[0041] Figure 1 This is a schematic illustration of a rechargeable battery pack according to one embodiment.

[0042] refer to Figure 1 According to one embodiment, the rechargeable battery pack 1000 includes a plurality of unit cells 100, a housing 200, and a fire extinguishing agent unit 300.

[0043] Multiple cell units 100 are adjacent to each other (e.g., close to each other or stacked side by side) and housed within the interior space 210 of the housing 200. The multiple cell units 100 may have various suitable rechargeable battery capacities and various suitable rechargeable battery shapes. For example, each of the multiple cell units 100 may have a battery capacity of approximately 18Wh and may have a cylindrical form, but this disclosure is not limited thereto. The multiple cell units 100 may be connected in series and / or in parallel with each other using various known connecting elements such as busbars. The multiple cell units 100 may be in contact with each other, but in other embodiments, the multiple cell units 100 may be spaced apart from each other. The multiple cell units 100 may be located on the underside of the interior space 210 of the housing 200, but are not limited thereto.

[0044] The housing 200 may have an internal space 210 for accommodating multiple individual cell units 100. The internal space 210 of the housing 200 may have various suitable rechargeable battery accommodating space forms. The internal space 210 of the housing 200 may have various suitable volumes. The housing 200 may include various suitable lower covers, side covers, or upper covers configured to accommodate multiple individual cell units 100.

[0045] The extinguishing agent unit 300 may be spaced apart from multiple unit cells 100 within the internal space 210 of the housing 200. The extinguishing agent unit 300 may extinguish the flame FI generated in the internal space 210 by generating a solid aerosol at a reference temperature (e.g., a predetermined temperature).

[0046] For example, the extinguishing agent unit 300 can generate a solid aerosol including potassium radicals at a reference temperature of about 300°C or higher. When a flame FI is generated in one of the multiple unit monomers 100, an endothermic reaction occurs in the extinguishing agent unit 300 to produce stable compounds due to the generation of the solid aerosol including potassium radicals. Therefore, the temperature of the internal space 210 of the housing 200 in which the flame FI is generated decreases, thereby effectively extinguishing the burning unit monomers 100 in the multiple unit monomers 100.

[0047] As another example, when a flame FI is generated in one of the multiple unit cells 100, the extinguishing agent unit 300 generates a solid aerosol containing potassium free radicals. The potassium free radicals reduce the concentration of H and OH in the internal space 210 of the housing 200. Therefore, the concentration of H and OH in the internal space 210 of the housing 200 where the flame FI is present is reduced or minimized, thereby effectively extinguishing the burning unit cells 100 in the multiple unit cells 100.

[0048] As another example, the solid aerosol generated by the extinguishing agent unit 300 includes potassium compounds K2O and KO. - The presence of H and OH reduces the concentration of H and OH in the internal space 210 of the shell 200, and according to the following chemical formula (but not limited to), the ignition in the burning unit 100 located in the internal space 210 can be extinguished.

[0049] Chemical formula

[0050] K2O+H + →2KOH, KOH + OH - →H2O, KO - +H + →KOH

[0051] The extinguishing agent unit 300 may be located on the upper side of the internal space 210 of the housing 200, but is not limited thereto. The extinguishing agent unit 300 may be attached to the inner surface 201 of the housing 200 located on the upper side of the internal space 210 of the housing 200.

[0052] For example, the extinguishing agent unit 300 may be attached to the inner surface 201 of the housing 200 by various suitable attachment elements such as tape (e.g., adhesive tape), or by a support member such as a support frame protruding from the inner surface 201 of the housing 200. The extinguishing agent unit 300 may be covered by various suitable covering elements such as capsules.

[0053] Figure 2 Show Figure 1 An example of a fire extinguishing agent unit 300 is shown.

[0054] refer to Figure 2 The extinguishing agent unit 300 may include a mixture 310 in which various suitable potassium compounds and various suitable resins are mixed, and a mesh 320 supporting the mixture 310. The mixture 310 may be in the form of potassium compounds and resins extruded (e.g., compressed) under high temperature and pressure, but is not limited thereto. The mesh 320 supports the mixture 310. The mesh 320 may be supported on the inner surface 201 of the housing 200, but is not limited thereto. The mesh 320 penetrates (e.g., extends through) and supports the mixture 310 in a horizontal direction, but is not limited thereto. In other embodiments, the mesh 320 may support the upper surface or the lower surface of the mixture 310.

[0055] Because the mixture 310 of the extinguishing agent unit 300 is supported by the mesh 320, and the mixture 310 of the extinguishing agent unit 300 burning by the burning unit 100 is supported by the mesh 320, the burning mixture 310 is prevented from falling from the mesh 320 onto the unit 100 and from increasing the temperature of the unit 100.

[0056] The weight of the extinguishing agent unit 300 satisfies Equation 1 below.

[0057] Equation 1

[0058] Y = 0.0088X + 0.211

[0059] In Equation 1, Y is the volumetric weight (g / L) of the extinguishing agent unit 300 in the internal space 210 of the housing 200, and X is the capacity (Wh) of one of the multiple unit cells 100 in the external space 210 of the housing 200. The volume of the internal space 210 of the housing 200 may be 6.8L, but is not limited thereto.

[0060] When the internal space 210 of the shell 200 can have various volumes, X in Equation 1 can satisfy the following Equation 2.

[0061] Equation 2

[0062] X = V × 6.8 / Z

[0063] In Equation 2, V is the capacity (Wh) of one of the multiple unit cells 100, and Z is the volume (L) of the internal space 210 of the housing 200.

[0064] When the volumetric weight (g / L) of the extinguishing agent unit 300 in the internal space 210 of the housing 200 satisfies Equations 1 and 2 above, a rechargeable battery pack 1000 is provided, which includes the extinguishing agent unit 300 configured to actively extinguish burning unit cells 100 in a plurality of unit cells 100.

[0065] In the following text, see references Figures 3 to 5 The experimental results describing the determination of the first fire extinguishing effect based on the weight of the fire extinguishing agent unit 300 of the rechargeable battery pack 1000 according to an embodiment will be described.

[0066] Figures 3 to 5 A graph showing the experimental results of confirming the first fire extinguishing effect based on the weight of the fire extinguishing agent unit of a rechargeable battery pack according to an embodiment. Figure 3 To show the maximum temperature (maxT) of the burning unit cell based on the unit volume weight (K radical weight) of the extinguishing agent unit in the internal space when the internal space has a volume of 6.8L. Figure 4 A graph showing the maximum temperature duration (high temperature duration) of a single burning unit based on the volumetric weight (K radical weight) of the extinguishing agent unit in the internal space when the internal space has a volume of 6.8L. Figure 5 This is a graph illustrating the temperature (NCell T) of the unit cell surrounding the burning unit cell based on the volumetric weight (Kradical weight) of the extinguishing agent unit within the internal space when the internal space has a volume of 6.8 L. Here, the unit cell near the burning unit cell may include the burning unit cell and another unit cell adjacent to it (or neighboring it).

[0067] refer to Figures 3 to 5 As an example, when the internal space of the housing has a volume of 6.8L, and each of the multiple unit cells housed in the internal space of the housing has a capacity of 18Wh (e.g., battery capacity or energy storage capacity), and the distance between the extinguishing agent unit and the multiple unit cells is in the range of about 2mm to about 70mm, when the weight of the extinguishing agent unit is 0.37g / L, the maximum temperature (max T) of the burning unit cell, the maximum temperature duration (high temperature duration), and the temperature of the nearby unit cells (N cell T) have the lowest points.

[0068] For example, when X in Equation 1 below is replaced with 18Wh, Y is calculated to be 0.37 g / L.

[0069] Equation 1

[0070] Y = 0.0088X + 0.211

[0071] In Equation 1, when the internal space of the shell has a known (or predetermined) volume, Y is the volumetric weight (g / L) of the extinguishing agent unit in the internal space of the shell, and X is the battery capacity (Wh) of one of the multiple unit cells.

[0072] As shown in the above experimental results, when the internal space of the shell has a volume of 6.8L, the maximum temperature (max T), the maximum temperature duration (high temperature duration), and the temperature of the nearby unit cell (N cell T) of the burning unit cell in the internal space of the shell have the lowest point at the weight of the extinguishing agent unit calculated according to Equation 1, which is 0.37 g / L.

[0073] For example, when the internal space of the shell has various volumes, X in Equation 1 can satisfy Equation 2 below.

[0074] Equation 2

[0075] X = V × 6.8 / Z

[0076] In Equation 2, V is the capacity (Wh) of one of the multiple unit cells, and Z is the volume (L) of the internal space of the shell.

[0077] When the internal volume of the casing is 0.765L and the battery capacity of one of the multiple cell units is 18Wh, X can be calculated as 160Wh by replacing V with 18Wh and Z with 0.765L in Equation 2. When X in Equation 1 is replaced with 160Wh, Y can be calculated as 1.62g / L.

[0078] When the volume of the internal space of the shell is 0.765L, the maximum temperature of the combustion unit cell in the internal space of the shell, the duration of the maximum temperature, and the temperature of the nearby unit cell can reach a minimum of 1.62g / L calculated according to Equations 1 and 2.

[0079] refer to Figure 1 For example, the volume of the internal space 210 of the housing 200 may be approximately 10 L, and the weight of the extinguishing agent unit 300 may be in the range of approximately 1 g to approximately 32 g. When the weight of the extinguishing agent unit 300 is less than approximately 1 g, it is difficult to handle the extinguishing agent unit 300, difficult to attach the extinguishing agent unit 300 to the inner surface 201, and simultaneously, due to the insufficient amount of extinguishing agent unit 300, it is difficult to extinguish the burning unit 100. When the weight of the extinguishing agent unit 300 exceeds approximately 32 g, the burning unit 100 can be extinguished, but due to the heat generated by the combustion of the extinguishing agent unit 300 itself, the fire spreads to the unit 100 near the burning unit 100. It can be confirmed that the numerical limits of the internal space 210 of the housing 200 being approximately 10 L and the weight of the extinguishing agent unit 300 being in the range of approximately 1 g to approximately 32 g define upper and lower threshold values.

[0080] refer to Figure 1The distance between the extinguishing agent unit 300 and the plurality of unit cells 100 can be in the range of approximately 2 mm to approximately 70 mm. Here, the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 may include a first distance L1 between the extinguishing agent unit 300 and a unit cell 100 perpendicular to its location (e.g., aligned with it), a second distance L2 between the extinguishing agent unit 300 and another unit cell 100, and a third distance L3 between the extinguishing agent unit 300 and yet another unit cell 100. The distance between the extinguishing agent unit 300 and the plurality of unit cells 100 may include the distance between the extinguishing agent unit 300 and one of the plurality of unit cells 100, and the distance between the extinguishing agent unit 300 and each of the plurality of unit cells 100.

[0081] For example, when the internal space 210 of the housing 200 has a volume of approximately 6.8 L, one of the multiple unit cells 100 has a battery capacity of approximately 18 Wh, and the extinguishing agent unit 300 has a weight of approximately 5 g, the distance between the extinguishing agent unit 300 and the multiple unit cells 100 can be in the range of approximately 2 mm to approximately 70 mm. When the distance between the extinguishing agent unit 300 and the multiple unit cells 100 is less than approximately 2 mm, the extinguishing agent unit 300 can block the path of the flame FI of the burning unit cell 100, and at the same time, the temperature of the burning unit cell 100 and the nearby unit cells 100 can increase due to the combustion heat of the extinguishing agent unit 300 itself. When the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 exceeds approximately 70 mm, the heat transferred from the flame FI of the burning unit cell 100 to the extinguishing agent unit 300 may be lower than (e.g., may not be reached) the reference temperature (e.g., approximately 300°C or higher) to burn the extinguishing agent unit 300, such that the extinguishing agent unit 300 may not generate solid aerosols. Upper and lower threshold thresholds are specified for the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 in the range of approximately 2 mm to approximately 70 mm.

[0082] In the following text, refer to Figures 6 to 8 The experimental results will be described based on the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 to confirm the fire extinguishing effect of the rechargeable battery pack 1000 according to an embodiment.

[0083] Figures 6 to 8 A graph showing experimental results of the fire extinguishing effect determined by the distance between multiple individual cells and the fire extinguishing agent cells of a rechargeable battery pack according to an embodiment. Figure 6To illustrate the maximum temperature (max T) of the burning unit cell based on the distance between the extinguishing agent unit and the multiple unit cells (distance from the cell to the K radical) when the internal space of the casing has a volume of 6.8 L, the battery capacity of one of the multiple unit cells is 18 Wh and the extinguishing agent unit has a weight of 5 g. Figure 7 To illustrate the maximum temperature duration (high temperature duration) of the burning unit cell based on the distance between the extinguishing agent unit and the multiple unit cells (distance from the cell to the K radical) when the internal space of the casing has a volume of 6.8L, the battery capacity of one of the multiple unit cells is 18Wh and the extinguishing agent unit has a weight of 5g. Figure 8 To illustrate the temperature (N Cell T) of the cell near the burning cell based on the distance between the extinguishing agent unit and the multiple cell units (distance from the cell to the K radical) when the internal space of the casing has a volume of 6.8 L, the battery capacity of one of the multiple cell units is 18 Wh and the extinguishing agent unit has a weight of 5 g.

[0084] refer to Figures 6 to 8 When the internal space of the casing has a volume of 6.8L, one of the multiple unit cells has a battery capacity of 18Wh, and the extinguishing agent unit weighs 5g, the maximum temperature and duration of maximum temperature of the burning unit cell are low when the distance between the unit cell and the extinguishing agent unit is in the range of approximately 2mm to approximately 32mm. The temperature of the unit cells near the burning unit cell is low when the distance between the unit cell and the extinguishing agent unit is in the range of approximately 2mm to approximately 32mm, and is lowest when the distance between the unit cell and the extinguishing agent unit is approximately 20mm. Before the extinguishing agent unit ignites, the smaller distance can disrupt the flame of the burning unit cell, causing flames in surrounding unit cells. Furthermore, the heat generated when the extinguishing agent unit burns is transferred to nearby unit cells, increasing the temperature of those nearby unit cells.

[0085] Based on the above experimental results, when the internal space of the shell has a volume of 6.8L, the battery capacity of one of the multiple unit cells is 18Wh, and the extinguishing agent unit has a weight of 5g, the distance between the extinguishing agent unit and the multiple unit cells is ideally in the range of about 2mm to about 32mm, and upper and lower thresholds are specified.

[0086] Additionally, when the internal space of the casing has a volume of 6.8L, one of the multiple unit cells has a battery capacity of 18Wh, and the extinguishing agent unit has a weight of 5g, the distance between the extinguishing agent unit and the multiple unit cells should be approximately 20mm.

[0087] For example, in a rechargeable battery pack 1000 according to one embodiment, when the volumetric weight (g / L) of the extinguishing agent unit 300 in the internal space 210 of the housing 200 satisfies Equation 1, the maximum temperature of the burning unit cell, the duration of the maximum temperature, and the temperature of the nearby unit cells become the lowest, and therefore, the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0088] Additionally, according to one embodiment, the rechargeable battery pack 1000 includes the following configuration: the volume of the internal space 210 of the housing 200 is about 10L, and the weight of the extinguishing agent unit 300 is in the range of about 1g to about 32g, within which it can actively extinguish burning unit cells 100 in a plurality of unit cells 100.

[0089] Additionally, according to one embodiment, a rechargeable battery pack 1000 includes a configuration in which the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is in the range of about 2 mm to about 70 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0090] Additionally, according to one embodiment, a rechargeable battery pack 1000 includes a configuration in which the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is in the range of about 2 mm to about 32 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0091] Additionally, according to one embodiment, a rechargeable battery pack 1000 includes the following configuration: the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is approximately 20 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0092] A rechargeable battery pack 1000 is provided, which is configured to actively extinguish burning cell 100s among a plurality of cell 100s.

[0093] In the following text, see references Figure 9 The following describes a rechargeable battery pack 1002 according to another embodiment.

[0094] In the following text, the parts and configurations that differ from those of the rechargeable battery pack 1000 according to the above embodiments will be described in detail.

[0095] Figure 9 This is a schematic illustration of a rechargeable battery pack according to another embodiment.

[0096] refer to Figure 9According to another embodiment, the rechargeable battery pack 1002 may include a plurality of unit cells 100, a housing 200, a fire extinguishing agent unit 300, and a battery management unit 400.

[0097] A battery management unit 400 may be located between a plurality of individual unit cells 100 and a fire extinguishing agent unit 300. The battery management unit 400 may be connected to the plurality of individual unit cells 100 and the fire extinguishing agent unit 300. The battery management unit 400 may sense (e.g., measure and / or determine) the temperature of the plurality of individual unit cells 100. When the temperature of at least one of the individual unit cells 100 exceeds a reference temperature, the battery management unit 400 may heat (e.g., ignite) the fire extinguishing agent unit 300. The fire extinguishing agent unit 300 heated by the battery management unit 400 may generate a solid aerosol comprising potassium radicals.

[0098] The battery management unit 400 may include a heater 410. The heater 410 may be attached to the extinguishing agent unit 300, and the battery management unit 400 may control the heater 410 to heat the extinguishing agent unit 300.

[0099] The battery management unit 400 may include, but is not limited to, various suitable battery management systems. In some embodiments, the battery management unit 400 may include temperature sensors configured to sense (e.g., configured to determine or measure) the temperature of a plurality of individual cells 100 and various heating elements for heating the extinguishing agent unit 300.

[0100] For example, because the rechargeable battery pack 1002 includes a battery management unit 400 configured to sense the temperature of a plurality of individual cells 100 and heat the extinguishing agent unit 300 to generate a solid aerosol from the extinguishing agent unit 300, the individual cells 100 can be actively extinguished if they are burning above a reference temperature or if they have a high (maximum) probability of combustion.

[0101] In addition, in the rechargeable battery pack 1002, when the unit volume weight (g / L) of the extinguishing agent unit 300 in the internal space 210 of the housing 200 satisfies Equation 1, the maximum temperature of the burning unit cell, the duration of the maximum temperature, and the temperature of the nearby unit cells become the lowest, and therefore, the burning unit cells 100 in the multiple unit cells 100 can be actively extinguished.

[0102] Additionally, the rechargeable battery pack 1002 includes the following configuration: the internal space 210 of the housing 200 has a volume of approximately 10L, and the weight of the extinguishing agent unit 300 is in the range of approximately 1g to approximately 32g, within which it can actively extinguish burning unit cells 100 in multiple unit cells 100.

[0103] In addition, the rechargeable battery pack 1002 includes the following configuration: the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is in the range of about 2 mm to about 70 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0104] Additionally, the rechargeable battery pack 1002 includes a configuration in which the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is in the range of about 2 mm to about 32 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0105] In addition, the rechargeable battery pack 1002 includes the following configuration: the distance between the extinguishing agent unit 300 and the plurality of unit cells 100 is about 20 mm, within which the burning unit cells 100 in the plurality of unit cells 100 can be actively extinguished.

[0106] A rechargeable battery pack 1002 is provided, which is configured to actively extinguish burning cell 100 among a plurality of cell 100.

[0107] While this disclosure is described in conjunction with what is now considered to be actual embodiments, it should be understood that this disclosure is not limited to the disclosed embodiments, but is intended to cover a variety of modifications and equivalent arrangements included within the scope of the claims and their equivalents.

Claims

1. A rechargeable battery pack, characterized in that, include: Multiple unit cells, adjacent to each other; The housing has an internal space for accommodating the plurality of unit cells; as well as The extinguishing agent unit, spaced apart from the plurality of individual units within the internal space of the housing, is configured to generate a solid aerosol at a reference temperature. Wherein, when the internal space of the shell has a known volume, the weight of the extinguishing agent unit satisfies Equation 1: Y = 0.0088X + 0.211 Where Y is the unit volumetric weight of the extinguishing agent unit in the internal space of the housing, in g / L, and X is the battery capacity of one of the plurality of unit cells, in Wh.

2. The rechargeable battery pack according to claim 1, characterized in that, In Equation 1, X satisfies Equation 2: X = V × 6.8 / Z Where V is the battery capacity of one of the plurality of individual cells, in Wh, and Z is the volume of the internal space of the casing, in L.

3. The rechargeable battery pack according to claim 1, characterized in that, When the known volume of the internal space of the housing is 10L, the weight of the extinguishing agent unit is in the range of 1g to 32g.

4. The rechargeable battery pack according to claim 1, characterized in that, The distance between the extinguishing agent unit and the plurality of individual units is in the range of 2mm to 70mm.

5. The rechargeable battery pack according to claim 1, characterized in that, The distance between the extinguishing agent unit and the plurality of individual units is in the range of 2mm to 32mm.

6. The rechargeable battery pack according to claim 1, characterized in that, The distance between the extinguishing agent unit and the plurality of individual units is 20 mm.

7. The rechargeable battery pack according to claim 1, characterized in that, The known volume of the internal space of the housing is 6.8L.

8. The rechargeable battery pack according to claim 1, characterized in that, The solid aerosol generated by the extinguishing agent unit includes potassium free radicals.

9. The rechargeable battery pack according to claim 8, characterized in that, The extinguishing agent unit comprises a mixture containing potassium compounds and resin.

10. The rechargeable battery pack according to claim 9, characterized in that, The extinguishing agent unit further includes a mesh that supports the mixture.

11. The rechargeable battery pack according to claim 10, characterized in that, The mesh penetrates the mixture.

12. The rechargeable battery pack according to claim 1, characterized in that, The plurality of unit cells are located on the lower side of the internal space of the housing, and The extinguishing agent unit is located on the upper side of the internal space of the housing.

13. The rechargeable battery pack according to claim 12, characterized in that, The extinguishing agent unit is attached to the inner surface of the housing.

14. The rechargeable battery pack according to claim 1, characterized in that, The rechargeable battery further includes a battery management unit connected to the plurality of individual units and the fire extinguishing agent unit, and disposed between the plurality of individual units and the fire extinguishing agent unit. The battery management unit is configured to sense the temperature of each of the plurality of individual cells and to heat the extinguishing agent unit when the temperature of one of the plurality of individual cells exceeds the reference temperature.

15. The rechargeable battery pack according to claim 14, characterized in that, The battery management unit includes a heater attached to the fire extinguishing agent unit, and The battery management unit is configured to control the heater to heat the extinguishing agent unit.

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