Rechargeable battery pack

Abstract

One or more embodiments of the present disclosure may include a rechargeable battery pack including: unit cells adjacent to each other; a case including an internal space for accommodating the unit cells; a fire extinguishing agent unit spaced apart from the unit cell and configured to generate a solid aerosol at a set temperature; and a medium between the plurality of fire extinguishing agent units.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure relate to rechargeable battery packs. Background Art

[0002] Generally, rechargeable batteries can be repeatedly charged and discharged.

[0003] A rechargeable battery pack may include unit cells and a housing for receiving the unit cells.

[0004] Some rechargeable battery packs have the problem that if one of the unit cells catches fire, adjacent unit cells can be burned by the flame generated by the burning unit cell. Summary of the Invention

[0005] One or more embodiments of the present disclosure provide a rechargeable battery pack configured to actively extinguish a burning unit cell in the unit cells.

[0006] According to one or more embodiments of the present disclosure, a rechargeable battery pack may include: a plurality of unit cells adjacent to each other; a housing including an internal space for accommodating the plurality of unit cells; a plurality of fire extinguishing agent units spaced apart from the plurality of unit cells and configured to generate solid aerosol at a set temperature; and a medium between the plurality of fire extinguishing agent units.

[0007] The medium may include a heat transfer unit for transferring heat between the plurality of fire extinguishing agent units.

[0008] The heat transfer unit may connect the plurality of fire extinguishing agent units.

[0009] The plurality of fire extinguishing agent units may be spaced apart from each other by a distance equal to or greater than about 70 mm, and the heat transfer unit is located between the plurality of fire extinguishing agent units.

[0010] The medium may include a heat delay unit that blocks a gap between the plurality of fire extinguishing agent units.

[0011] The heat delay unit may cover the gap between the plurality of fire extinguishing agent units.

[0012] The plurality of fire extinguishing agent units may overlap each other, and the heat delay unit is located between the plurality of fire extinguishing agent units.

[0013] The weight of a first fire extinguishing agent unit among the plurality of fire extinguishing agent units may satisfy Equation 1: Y = 0.0088X + 0.211, where Y is the unit volume weight (g / L) of the first fire extinguishing agent unit in the internal space of the housing, and X is the battery capacity (Wh) of one of the plurality of unit cells.

[0014] In Equation 1, X can satisfy Equation 2: X = V × 6.8 / Z, where V is the battery capacity (Wh) of one of the plurality of unit cells, and Z is the volume (L) of the internal space of the housing.

[0015] The set volume of the internal space of the housing can be about 6.8 L.

[0016] The distance between the first fire extinguishing agent unit of the plurality of fire extinguishing agent units and the unit cell can be about 2 mm to about 70 mm.

[0017] The distance between the first fire extinguishing agent unit and the unit cell can be about 2 mm to about 32 mm.

[0018] The distance between the first fire extinguishing agent unit and the unit cell can be about 20 mm.

[0019] The solid aerosol can include potassium radicals.

[0020] The plurality of fire extinguishing agent units can include a mixture of a potassium compound and a resin.

[0021] The plurality of fire extinguishing agent units can further include a mesh for supporting the mixture.

[0022] The mesh can be configured to penetrate the mixture.

[0023] The first fire extinguishing agent unit of the plurality of fire extinguishing agent units can be in the internal space of the housing, and the second fire extinguishing agent unit of the plurality of fire extinguishing agent units can be in the second internal space of the second housing.

[0024] The rechargeable battery pack can further include: a battery manager connected to the unit cell and the fire extinguishing agent unit and between the unit cell and the fire extinguishing agent unit, where the battery manager is configured to sense the temperature of the unit cell and is configured to heat one of the plurality of fire extinguishing agent units in response to the temperature of one of the plurality of unit cells being higher than a set temperature.

[0025] The battery manager can include a heater attached to the fire extinguishing agent unit, and the battery manager is configured to control the heater to heat the fire extinguishing agent unit.

[0026] According to an embodiment, there is provided a rechargeable battery pack configured to actively extinguish a burning unit cell in a unit cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shows a rechargeable battery pack according to some embodiments.

[0028] Figure 2 Shows Figure 1 Examples of the fire extinguishing agent unit and the medium shown in.

[0029] Figure 3 Another example of an extinguishing agent unit and a medium of a rechargeable battery pack according to some embodiments is shown.

[0030] Figures 4 to 6 A graph showing experimental results of checking the effect based on the weight of an extinguishing agent unit of a rechargeable battery pack according to some embodiments is shown.

[0031] Figures 7 to 9 A graph showing experimental results of checking the effect based on the distance between an extinguishing agent unit and a unit cell of a rechargeable battery pack according to some embodiments is shown.

[0032] Figure 10 A rechargeable battery pack according to some embodiments is shown.

[0033] Figure 11 A rechargeable battery pack according to some embodiments is shown. Detailed Description

[0034] The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. As will be recognized by those skilled in the art, the embodiments described herein can be modified in one or more suitable different ways, all of which do not depart from the scope of the present disclosure.

[0035] 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, connected or coupled to the other element or layer, or there may also be one or more intervening elements or layers. 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" or "connected" to a second element, the first element can be directly coupled or connected to the second element, or the first element can be indirectly coupled or connected to the second element via one or more intervening elements.

[0036] In the drawings, for clarity of illustration, the dimensions of various elements, layers, etc. may be exaggerated. 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 listed items. Further, the use of "may" in describing embodiments of the present disclosure refers to "one or more embodiments of the present disclosure". Expressions such as "at least one of..." and "any one of..." when before / after a list of elements modify the entire list of elements and do not modify a single element 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 of 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 utilized", respectively. As used herein, the terms "substantially", "about", and similar terms are used as approximate terms and not degree terms, and are intended to account for the inherent variations in measured or calculated values that would be recognized by a person of ordinary skill in the art.

[0037] 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, 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, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms such as "beneath", "below", "lower", "above", and "upper" may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element or feature described as "beneath" or "below" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0039] The terms used herein are for the purpose of describing embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form "a" is intended to also include the plural form. It will be further understood that the terms "comprising" and / or "having", when used in this specification, specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0040] Those of ordinary skill in the art will recognize that, given the overall content of the present disclosure, each suitable feature of the various embodiments of the present disclosure can be partially or fully combined or combined with each other, and can be interlocked and operated in various suitable ways, and unless otherwise stated or implied, each embodiment can be implemented independently of each other or combined with each other in any suitable way.

[0041] Also, any numerical range disclosed and / or set forth herein is intended to include all sub-ranges subsumed within the stated range with the same numerical precision. For example, the range "1.0 to 10.0" is intended to include all sub-ranges between the stated minimum value of 1.0 and the stated maximum value of 10.0 (and including 1.0 and 10.0), i.e., 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 limitation set forth herein is intended to include all lower numerical limitations subsumed therein, and any minimum numerical limitation set forth in this specification is intended to include all higher numerical limitations subsumed therein. Accordingly, the applicant reserves the right to modify this specification (including the claims) to expressly set forth any sub-ranges subsumed within the ranges expressly set forth herein. All such ranges are intended to be inherently described in this specification such that the ranges used to expressly set forth any such sub-ranges will comply with the requirements.

[0042] Reference will be made to Figures 1 to 9 describe a rechargeable battery pack according to one or more embodiments.

[0043] The rechargeable battery pack may include a cell and a housing for receiving (or accommodating) the cell. However, the rechargeable battery pack is not limited thereto and may include a plurality of rechargeable battery modules, each including a cell and a housing for receiving the cell.

[0044] Figure 1 FIG. shows a rechargeable battery pack according to some embodiments.

[0045] Reference Figure 1 , the rechargeable battery pack 1000 may include a cell 100, a housing 200, a fire extinguishing agent unit 300, and a medium 400.

[0046] The unit cells 100 may be adjacent to each other (e.g., adjacent to or stacked side by side with each other), and may be received (or accommodated) in the internal space 210 of the housing 200. The unit cells 100 may have various suitable rechargeable battery capacities and various suitable rechargeable battery forms. For example, each unit cell 100 may have a battery capacity of about 18 Wh and a cylindrical shape, but is not limited thereto. The unit cells 100 may be connected in series or in parallel with each other by using various suitable connection elements. The unit cells 100 may be in contact with each other, and / or the unit cells 100 may be spaced apart from each other, but is not limited thereto. The unit cells 100 may be arranged on the lower side of the internal space 210 of the housing 200, but is not limited thereto.

[0047] The housing 200 may include an internal space 210 for receiving the unit cells 100. The internal space 210 of the housing 200 may have one or more suitable spatial shapes for receiving (or accommodating) rechargeable batteries. The internal space 210 of the housing 200 may have one or more suitable volumes. The housing 200 may include one or more suitable lower covers, side covers, and / or upper covers for receiving (or accommodating) the unit cells 100.

[0048] The fire extinguishing agent unit 300 may be spaced apart from the unit cells 100 in the internal space 210 of the housing 200. The fire extinguishing agent unit 300 may generate a solid aerosol at a set or reference temperature (e.g., a predetermined temperature), and may extinguish the flame FI generated in the internal space 210.

[0049] For example, the fire extinguishing agent unit 300 may generate a solid aerosol including potassium radicals at a set or predetermined temperature of about 300 °C or higher. If the flame FI is generated by one of the unit cells 100, at least one of the fire extinguishing agent units 300 generates a solid aerosol including potassium radicals, and an endothermic reaction for generating a stable compound is generated by the fire extinguishing agent unit 300, so that the temperature in the internal space 210 of the housing 200 where the flame FI is generated may be reduced, and the burning unit cell 100 in the unit cells 100 may be effectively extinguished.

[0050] According to another example, if the flame FI is generated by one of the unit cells 100, at least one of the fire extinguishing agent units 300 may generate a solid aerosol including potassium radicals, and the potassium radicals reduce the concentrations of H and OH in the internal space 210 of the housing 200, so that the concentrations of H and OH in the internal space 210 of the housing 200 where the flame FI is generated may be minimized or reduced, and the burning unit cell 100 in the unit cells 100 may be effectively extinguished.

[0051] According to another example, the concentrations of H and OH in the internal space 210 of the housing 200 are based on the following by K 2O and KO - is reduced (or decomposed) according to the chemical formula shown, K 2 O and KO - is a potassium compound included in the solid aerosol generated by at least one of the fire extinguishing agent units 300, and thus can extinguish the unit cell 100 burning in the internal space 210.

[0052] Chemical formula

[0053] K 2 O + H + → 2KOH, KOH + OH - → H 2 O, KO - + H + → KOH

[0054] The fire extinguishing agent unit 300 may be on the upper side (or area) of the internal space 210 of the housing 200, but is not limited thereto. The fire extinguishing agent unit 300 may be attached to the inner surface 201 of the housing 200 on the upper side (or area) of the internal space 210 of the housing 200.

[0055] For example, the fire extinguishing agent unit 300 may be attached to the inner surface 201 of the housing 200 by one or more suitable attachment elements such as a belt, or may be attached to the inner surface 201 of the housing 200 by a support element such as a support protruding from the inner surface 201 of the housing 200. The fire extinguishing agent unit 300 may be covered by one or more suitable covering elements such as a capsule.

[0056] The medium 400 may be located between the fire extinguishing agent units 300. The medium 400 may connect the fire extinguishing agent units 300. The medium 400 may transfer heat from the first fire extinguishing agent unit 300 burned by the flame FI of the burning unit cell 100 in the fire extinguishing agent unit 300 to the second fire extinguishing agent unit 300. The medium 400 may include a heat transfer unit for transferring heat between the fire extinguishing agent units 300. The heat transfer unit of the medium 400 may connect the fire extinguishing agent units 300. The fire extinguishing agent units 300 may be spaced apart from each other by about 70 mm or more, and the heat transfer unit of the medium 400 is located between the fire extinguishing agent units 300. The heat transfer unit of the medium 400 may include one or more suitable types (kinds) of heat transfer elements. For example, the heat transfer unit of the medium 400 may have a form of coating a flammable material such as gunpowder, potassium nitrate, or oil along a line for connecting adjacent fire extinguishing agent units 300, but is not limited thereto. Again, for example, the heat transfer unit of the medium 400 may include one or more suitable types (kinds) of metals for transferring heat between adjacent fire extinguishing agent units 300, but is not limited thereto. The heat transfer unit of the medium 400 may include one or more suitable heat transfer elements for transferring heat of about 300 °C or higher between adjacent fire extinguishing agent units 300.

[0057] The heat transfer unit of the medium 400 can be connected to the fire extinguishing agent unit 300 to transfer heat between the fire extinguishing agent units 300, so that the heat generated by the combustion of the first fire extinguishing agent unit 300 due to the flame FI of the burning unit cell 100 can be transferred to the adjacent second fire extinguishing agent unit 300 to generate solid aerosol. And if the first fire extinguishing agent unit 300 burns for a set or predetermined time, the second fire extinguishing agent unit 300 can also be burned and the second fire extinguishing agent unit 300 can generate solid aerosol. The fire extinguishing agent units 300 can be sequentially heated by the medium 400 to a set or predetermined temperature to sequentially generate solid aerosol in the internal space 210 of the housing 200, thereby effectively extinguishing the burning unit cell 100 in the unit cell 100.

[0058] Figure 2 Shows Figure 1 An example of the fire extinguishing agent unit and the medium shown therein.

[0059] For example, referring to Figure 2 , the fire extinguishing agent unit 300 can include a mixture 310 formed by one or more suitable potassium compounds and one or more suitable resins, and a mesh for supporting the mixture 310. The mesh can be included in the medium 400. In some embodiments, an additional mesh can be included in the fire extinguishing agent unit 300, but is not limited thereto. The mixture 310 can have a form in which the potassium compound and the resin can be compressed under high temperature and high pressure, but is not limited thereto. The mesh of the medium 400 can support the mixture 310. The mesh of the medium 400 can be supported on the inner surface 201 of the housing 200, but is not limited thereto. The mesh of the medium 400 can penetrate the mixture 310 in the horizontal direction and can support the mixture 310. However, in some embodiments, the mesh of the medium 400 can support the lower side or the upper side of the mixture 310, but is not limited thereto.

[0060] Since the mixture 310 of the fire extinguishing agent unit 300 is supported by the mesh of the medium 400, the mixture 310 of the first fire extinguishing agent unit 300 burned by the burning unit cell 100 in the fire extinguishing agent unit 300 can be supported by the mesh of the medium 400. Therefore, the burning mixture 310 can be prevented from falling from the mesh of the medium 400 onto the unit cell 100, and the temperature rise of the unit cell 100 can be inhibited or reduced.

[0061] The mesh of the medium 400 may include a metal as a heat transfer unit. The mesh of the medium 400 may connect the fire extinguishing agent units 300 to transfer heat between the fire extinguishing agent units 300, and the heat of the first fire extinguishing agent unit 300 burned by the flame of the burning unit cell 100 may generate a solid aerosol, which may also be transferred to the adjacent second fire extinguishing agent unit 300. Thus, if the first fire extinguishing agent unit 300 burns for a set or predetermined time, the second fire extinguishing agent unit 300 may also be burned and the second fire extinguishing agent unit 300 may generate a solid aerosol. The fire extinguishing agent units 300 may be sequentially heated through the mesh of the medium 400 at a set or predetermined temperature to sequentially generate solid aerosols in the internal space 210 of the housing 200, thereby effectively extinguishing the burning unit cells 100 in the unit cell 100.

[0062] Figure 3 Another example of a fire extinguishing agent unit and a medium of a rechargeable battery pack according to an embodiment is shown.

[0063] According to another example, referring to Figure 3 , the first fire extinguishing agent unit 300 in the fire extinguishing agent units 300 may be disposed in the first internal space 210a of the first housing 200a, the second fire extinguishing agent unit 300 may be disposed in the second internal space 210b of the second housing 200b, and the third fire extinguishing agent unit 300 may be disposed in the third internal space 210c of the third housing 200c. The medium 400 may connect the first fire extinguishing agent unit 300, the second fire extinguishing agent unit 300, and the third fire extinguishing agent unit 300 in the fire extinguishing agent units 300. The medium 400 may include a heat transfer unit. The medium 400 may connect the first fire extinguishing agent unit 300 disposed in the first internal space 210a of the first housing 200a, the second fire extinguishing agent unit 300 disposed in the second internal space 210b of the second housing 200b, and the third fire extinguishing agent unit 300 disposed in the third internal space 210c of the third housing 200c to transfer heat between the fire extinguishing agent units 300. The fire extinguishing agent units 300 may be sequentially heated through the medium 400 at a set or predetermined temperature to sequentially generate solid aerosols in the first internal space 210a of the first housing 200a, the second internal space 210b of the second housing 200b, and the third internal space 210c of the third housing 200c, thereby effectively extinguishing the unit cells disposed in the internal space of the housing.

[0064] The weight of the first fire extinguishing agent unit 300 in the fire extinguishing agent units 300 may satisfy Equation 1.

[0065] Equation 1

[0066] Y = 0.0088X + 0.211

[0067] In Equation 1, Y is the unit volume weight (g / L) of the first fire extinguishing agent unit 300 in the internal space 210 of the housing 200, and X is the battery capacity (Wh) of one of the unit cells 100 in the internal space 210 of the housing 200. For example, the set or predetermined volume of the internal space 210 of the housing 200 may be approximately 6.8 L, but is not limited thereto.

[0068] If the internal space 210 of the housing 200 has various volumes, X in Equation 1 may satisfy Equation 2.

[0069] Equation 2

[0070] X = V × 6.8 / Z

[0071] In Equation 2 herein, V is the battery capacity (Wh) of one of the unit cells 100, and Z is the volume (L) of the internal space 210 of the housing 200.

[0072] The unit volume weight (g / L) of the first fire extinguishing agent unit 300 in the internal space 210 of the housing 200 may satisfy Equation 1 and Equation 2, thus providing a rechargeable battery pack 1000 including a fire extinguishing agent unit 300 for actively extinguishing a burning unit cell 100 in the unit cells 100.

[0073] Now, reference will be made to Figures 4 to 6 Describe the test results for examining the weight-based effect (or efficacy) of the first fire extinguishing agent unit 300 in the fire extinguishing agent unit 300 of the rechargeable battery pack 1000 according to some embodiments.

[0074] Figures 4 to 6 A graph showing the experimental results of the inspection effect based on the weight of the fire extinguishing agent unit of a rechargeable battery pack according to some embodiments. Figure 4 A graph showing the maximum temperature (max T) of a unit cell burning according to the unit volume weight (K radical weight) of the fire extinguishing agent unit in the internal space if the internal space of the housing has a volume of approximately 6.8 L, Figure 5 A graph showing the maximum temperature duration (high temperature duration) of a unit cell burning according to the unit volume weight (K radical weight) of the fire extinguishing agent unit in the internal space if the internal space of the housing has a volume of approximately 6.8 L, and Figure 6 A graph showing the temperature (N Cell T) of the unit cells arranged around a unit cell burning according to the unit volume weight (K radical weight) of the fire extinguishing agent unit in the internal space if the internal space of the housing has a volume of approximately 6.8 L. For example, the unit cells around the burning unit cell may include another unit cell adjacent to the burning unit cell.

[0075] In some embodiments, Figures 4 to 6 it is shown that if the internal space of the housing has a volume of about 6.8 L, and if the weight of the fire extinguishing agent unit is about 0.37 g / L (e.g., when the weight of the fire extinguishing agent unit is about 0.37 g / L), the maximum temperature (max T) of the burning unit cell, the maximum temperature duration (high temperature duration), and the temperature of the unit cells around the burning unit cell (N Cell T) have a lowest point, each unit cell received (or accommodated) in the internal space of the housing has a battery capacity of about 18 Wh, and the distance between the fire extinguishing agent unit and the unit cell is about 2 mm to about 70 mm.

[0076] For example, if X in Equation 1 is replaced with about 18 Wh, Y is calculated to be about 0.37 g / L.

[0077] Equation 1

[0078] Y = 0.0088X + 0.211

[0079] Here, if the internal space of the housing has a set or predetermined volume, Y is the unit volume weight (g / L) of the first fire extinguishing agent unit in the internal space of the housing, and X is the battery capacity (Wh) of one of the unit cells.

[0080] In some embodiments, if the internal space of the housing is about 6.8 L, the maximum temperature (max T) of the unit cell burning in the internal space of the housing, the maximum temperature duration (high temperature duration), and the temperature of the unit cells around the burning unit cell (N Cell T) have a lowest point at a fire extinguishing agent unit weight of about 0.37 g / L calculated according to Equation 1.

[0081] For example, if the internal space of the housing has one or more suitable volumes, X in Equation 1 can satisfy Equation 2.

[0082] Equation 2

[0083] X = V × 6.8 / Z

[0084] Here, V is the battery capacity (Wh) of one of the unit cells, and Z is the volume (L) of the internal space of the housing.

[0085] If the volume of the internal space of the housing is about 0.765 L, and the battery capacity of one of the unit cells is about 18 Wh, then about 18 Wh can be substituted for V, about 0.765 L can be substituted for Z, and X in Equation 2 can be calculated to be about 160 Wh. If X in Equation 1 is replaced with about 160 Wh, then Y can be calculated to be about 1.62 g / L.

[0086] If the volume of the internal space of the housing is approximately 0.765 L, the maximum temperature, the maximum temperature duration, and the temperature of the unit cells around the burning unit cell in the internal space of the housing may have a lowest point at approximately 1.62 g / L calculated according to Equation 1 and Equation 2.

[0087] Reference 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 first fire extinguishing agent unit 300 in the fire extinguishing agent unit 300 may be from approximately 1 g to approximately 32 g. If the weight of the first fire extinguishing agent unit 300 is less than approximately 1 g, it may be difficult to handle the fire extinguishing agent unit 300, difficult to attach the fire extinguishing agent unit 300 to the inner surface 201, and the amount of the fire extinguishing agent unit 300 is small (e.g., a relatively small amount), so it may be difficult to extinguish the burning unit cell 100. If the weight of the first fire extinguishing agent unit 300 is greater than approximately 32 g, the burning unit cell 100 may be extinguished, and the combustion may spread to the unit cells 100 arranged around the burning unit cell 100 due to the heat generated by the combustion of the fire extinguishing agent unit 300. In some embodiments, the numerical limit configuration where the volume of the internal space 210 of the housing 200 is approximately 10 L and the weight of the first fire extinguishing agent unit 300 in the fire extinguishing agent unit 300 is from approximately 1 g to approximately 32 g defines the threshold values of the upper limit and the lower limit.

[0088] Reference Figure 1 , the distance between the first fire extinguishing agent unit 300 and the unit cell 100 may be from approximately 2 mm to approximately 70 mm. For example, the distance between the first fire extinguishing agent unit 300 and the unit cell 100 may include a first distance L1 in the vertical direction between the fire extinguishing agent unit 300 and the first unit cell 100, a second distance L2 between the fire extinguishing agent unit 300 and the second unit cell 100, and a third distance L3 between the fire extinguishing agent unit 300 and the third unit cell 100. The distance between the first fire extinguishing agent unit 300 and the unit cell 100 may include the distance between the first fire extinguishing agent unit 300 and one of the unit cells 100 and the distances between the first fire extinguishing agent unit 300 and each of the unit cells 100.

[0089] For example, if the internal space 210 of the housing 200 has a volume of approximately 6.8 L, the battery capacity of one of the unit cells 100 is approximately 18 Wh, and the fire extinguishing agent unit 300 has a weight of approximately 5 g, the distance between the first fire extinguishing agent unit 300 and the unit cell 100 can be from approximately 2 mm to approximately 70 mm. When the distance between the first fire extinguishing agent unit 300 and the unit cell 100 is less than approximately 2 mm, the fire extinguishing agent unit 300 obstructs the path of the flame FI of the burning unit cell 100, and the temperature of the burning unit cell 100 and the unit cells 100 around the burning unit cell 100 can increase due to the combustion heat of the fire extinguishing agent unit 300. If the distance between the first fire extinguishing agent unit 300 and the unit cell 100 is greater than approximately 70 mm, the heat transferred from the flame FI of the burning unit cell 100 to the fire extinguishing agent unit 300 can be lower than the set temperature (e.g., 300 °C or higher) for burning the fire extinguishing agent unit 300, and the fire extinguishing agent unit 300 may not be able to generate solid aerosol. It can be found that the numerical limit configuration of the distance between the first fire extinguishing agent unit 300 and the unit cell 100 from approximately 2 mm to approximately 70 mm defines the threshold values of the upper limit and the lower limit.

[0090] Now, reference will be made to Figures 7 to 9 describe the test results for examining the effects caused by the distance between the first fire extinguishing agent unit 300 and the unit cell 100 of the rechargeable battery pack 1000 according to some embodiments.

[0091] Figures 7 to 9 A graph showing the experimental results of examining the effects of the distance between the fire extinguishing agent unit and the unit cell of a rechargeable battery pack according to some embodiments. Figure 7 A graph showing the maximum temperature (maxT) of the burning unit cell according to the distance between the fire extinguishing agent unit and the unit cell (distance from the monomer to the K radical) if the internal space of the housing has a volume of approximately 6.8 L, the battery capacity of one of the unit cells is approximately 18 Wh, and the fire extinguishing agent unit has a weight of approximately 5 g. Figure 8 A graph showing the maximum temperature duration (high temperature duration) of the burning unit cell according to the distance between the fire extinguishing agent unit and the unit cell (distance from the monomer to the K radical) if the internal space of the housing has a volume of approximately 6.8 L, the battery capacity of one of the unit cells is approximately 18 Wh, and the fire extinguishing agent unit has a weight of approximately 5 g. Figure 9 A graph showing the temperature (N Cell T) of the unit cells arranged around the burning unit cell according to the distance between the fire extinguishing agent unit and the unit cell (distance from the monomer to the K radical) if the internal space of the housing has a volume of approximately 6.8 L, the battery capacity of one of the unit cells is approximately 18 Wh, and the fire extinguishing agent unit has a weight of approximately 5 g.

[0092] Reference Figures 7 to 9 It can be found that if the internal space of the housing has a volume of about 6.8 L, the battery capacity of one of the unit cells is about 18 Wh and the fire extinguishing agent unit has a weight of about 5 g, and if the distance between the unit cell and the fire extinguishing agent unit is about 2 mm to about 32 mm (for example, when the distance between the unit cell and the fire extinguishing agent unit is about 2 mm to about 32 mm), the maximum temperature and the maximum temperature duration of the burning unit cell are relatively low, and if the distance between the unit cell and the fire extinguishing agent unit is about 2 mm to about 32 mm (for example, when the distance between the unit cell and the fire extinguishing agent unit is about 2 mm to about 32 mm), the temperature of the unit cells arranged around the burning unit cell is relatively low, and if the distance between the unit cell and the fire extinguishing agent unit is about 20 mm (for example, when the distance between the unit cell and the fire extinguishing agent unit is about 20 mm), it has the lowest point. It can be found that this may be because the flame of the burning unit cell before the fire extinguishing agent unit burns can be blocked, so as to direct the flame to the unit cells arranged around the burning unit cell, and if heat generated when the fire extinguishing agent unit burns (for example, when the fire extinguishing agent unit burns) is transferred to the unit cells arranged around the burning unit cell to increase the temperature of the unit cells arranged around the burning unit cell.

[0093] According to the above test results, the following numerical limit configuration can be found: If the internal space of the housing has a volume of about 6.8 L, the battery capacity of one of the unit cells is about 18 Wh and the fire extinguishing agent unit has a weight of about 5 g, then the distance between the fire extinguishing agent unit and the unit cell is about 2 mm to about 32 mm.

[0094] The following numerical limit configuration can be found: If the internal space of the housing has a volume of about 6.8 L, the battery capacity of one of the batteries is about 18 Wh and the fire extinguishing agent unit has a weight of about 5 g, then the distance between the fire extinguishing agent unit and the unit cell is about 20 mm.

[0095] For example, the medium 400 can be connected to the fire extinguishing agent units 300 to transfer heat between the fire extinguishing agent units 300. The fire extinguishing agent units 300 can be heated sequentially at a set or predetermined temperature through the medium 400 to generate solid aerosol sequentially in the internal space 210 of the housing 200. Therefore, the rechargeable battery pack 1000 according to one or more embodiments can effectively extinguish the burning unit cells 100 in the unit cell 100.

[0096] In some embodiments, the weight per unit volume (g / L) of the first fire extinguishing agent unit 300 in the internal space 210 of the housing 200 may satisfy Equation 1, and the maximum temperature, the maximum temperature duration of the burning unit cell, and the temperature of the unit cells arranged around the burning unit cell may become the lowest. Accordingly, the rechargeable battery pack 1000 according to one or more embodiments may actively extinguish the burning unit cell 100 in the unit cells 100.

[0097] The rechargeable battery pack 1000 according to one or more embodiments may include a configuration having a numerical limit threshold that limits the volume of the internal space 210 of the housing 200 to about 10 L and the weight of the first fire extinguishing agent unit 300 to about 1 g to about 32 g, thereby actively extinguishing the burning unit cell 100 in the unit cells 100.

[0098] The rechargeable battery pack 1000 according to one or more embodiments may include a configuration having a numerical limit threshold that limits the distance between the first fire extinguishing agent unit 300 and the unit cells 100 to about 2 mm to about 70 mm, thereby actively extinguishing the burning unit cell 100 in the unit cells 100.

[0099] The rechargeable battery pack 1000 according to one or more embodiments may include a configuration having a numerical limit threshold that limits the distance between the first fire extinguishing agent unit 300 and the unit cells 100 to about 2 mm to about 32 mm, thereby actively extinguishing the burning unit cell 100 in the unit cells 100.

[0100] The rechargeable battery pack 1000 according to one or more embodiments may include a configuration having a numerical limit threshold that limits the distance between the first fire extinguishing agent unit 300 and the unit cells 100 to 20 mm, thereby actively extinguishing the burning unit cell 100 in the unit cells 100.

[0101] Provided is a rechargeable battery pack 1000 for actively extinguishing the burning unit cell 100 in the unit cells 100.

[0102] Now, reference will be made to Figure 10 describe the rechargeable battery pack 1002 according to some other embodiments.

[0103] Now, the parts different from the rechargeable battery pack according to one or more embodiments will be described.

[0104] Figure 10 The rechargeable battery pack according to some other embodiments is shown.

[0105] Reference Figure 10, according to some other embodiments, the rechargeable battery pack 1002 may include a unit cell 100, a housing 200, a fire extinguishing agent unit 300, and a medium 400.

[0106] The fire extinguishing agent units 300 may overlap each other in the vertical direction in the internal space 210 of the housing 200, and the medium 400 is located therebetween. The medium 400 may be disposed between the fire extinguishing agent units 300. The medium 400 may separate the fire extinguishing agent units 300. The medium 400 may block or reduce the heat from the first fire extinguishing agent unit 300 burned by the flame FI of the burning unit cell 100 in the fire extinguishing agent unit 300 for a set or predetermined time. The medium 400 may include a heat delay unit for blocking the gap between the fire extinguishing agent units 300. The heat delay unit of the medium 400 may cover the gap between the fire extinguishing agent units 300. The heat delay unit of the medium 400 may include one or more suitable types of heat delay elements for blocking the heat for a set or predetermined time. For example, the heat delay unit of the medium 400 may include paper and a resin tape for covering the gap between the overlapping fire extinguishing agent units 300. For example, the resin tape may include one or more suitable types of suitable resins, such as polypropylene (PP), polyimide (PI), or polyethylene terephthalate (PET). The heat delay unit of the medium 400 may include one or more suitable types of heat delay elements for delaying the heat transferred between the overlapping fire extinguishing agent units 300 for a set or predetermined time.

[0107] The heat delay unit of the medium 400 may block or reduce the gap between the fire extinguishing agent units 300 to delay the heat transferred between the fire extinguishing agent units 300 for a set or predetermined time. The heat of the first fire extinguishing agent unit 300 that burns due to the flame FI of the burning unit cell 100 in the fire extinguishing agent unit 300 and generates solid aerosol may be transferred to the adjacent second fire extinguishing agent unit 300 after a set or predetermined time. Therefore, the second fire extinguishing agent unit 300 may burn after the first fire extinguishing agent unit 300 has burned for a set or predetermined time, and the second fire extinguishing agent unit 300 may generate solid aerosol. The fire extinguishing agent units 300 may be sequentially heated through the medium 400 at a set or predetermined temperature to sequentially generate solid aerosol in the internal space 210 of the housing 200, thereby effectively extinguishing the burning unit cell 100 in the unit cell 100.

[0108] For example, the medium 400 may block or reduce the gap between the fire extinguishing agent units 300 to delay the heat transferred between the fire extinguishing agent units 300 for a set or predetermined time, and the fire extinguishing agent units 300 may be sequentially heated through the medium 400 at a set or predetermined temperature to sequentially generate solid aerosol in the internal space 210 of the housing 200. Therefore, the rechargeable battery pack 1002 according to other embodiments may effectively extinguish the burning unit cell 100 in the unit cell 100.

[0109] The unit volume weight (g / L) of the first fire extinguishing agent unit 300 in the internal space 210 of the housing 200 can satisfy Equation 1, and the maximum temperature, maximum temperature duration of the burning unit cell, and the temperature of the unit cells arranged around the burning unit cell can be minimized. Therefore, the rechargeable battery pack 1002 according to other embodiments can actively extinguish the burning unit cell 100 in the unit cell 100.

[0110] The rechargeable battery pack 1002 according to other embodiments includes a configuration having a numerical limit threshold, wherein the volume of the internal space 210 of the housing 200 is about 10 L, and the weight of the first fire extinguishing agent unit 300 is about 1 g to about 32 g, thereby actively extinguishing the burning unit cell 100 in the unit cell 100.

[0111] The rechargeable battery pack 1002 according to other embodiments includes a configuration having a numerical limit threshold, wherein the distance between the first fire extinguishing agent unit 300 and the unit cell 100 is about 2 mm to about 70 mm, thereby actively extinguishing the burning unit cell 1000 in the unit cell 100.

[0112] The rechargeable battery pack 1002 according to other embodiments may include a configuration having a numerical limit threshold, wherein the distance between the first fire extinguishing agent unit 300 and the unit cell 100 is about 2 mm to about 32 mm, thereby actively extinguishing the burning unit cell 100 in the unit cell 100.

[0113] The rechargeable battery pack 1002 according to other embodiments may include a configuration having a numerical limit threshold, wherein the distance between the first fire extinguishing agent unit 300 and the unit cell 100 is about 20 mm, thereby actively extinguishing the burning unit cell 100 in the unit cell 100.

[0114] A rechargeable battery pack 1002 is provided for actively extinguishing the burning unit cell 100 in the unit cell 100.

[0115] Now reference will be made to Figure 11 Describe the rechargeable battery pack 1003 according to other embodiments.

[0116] Now, the parts different from the above rechargeable battery pack according to some embodiments will be described.

[0117] Figure 11 Show the rechargeable battery pack according to other embodiments.

[0118] Reference Figure 11 , the rechargeable battery pack 1003 may include a unit cell 100, a housing 200, a fire extinguishing agent unit 300, a medium 400, and a battery manager 500.

[0119] The battery manager 500 may be disposed between the unit cells 100 and the fire extinguishing agent units 300. The battery manager 500 may be connected to at least one of the unit cells 100 and the fire extinguishing agent units 300. The battery manager 500 may sense the temperature of the unit cells 100. If the temperature of one of the unit cells 100 is higher than a set or predetermined temperature, the battery manager 500 may heat at least one of the fire extinguishing agent units 300. At least one of the fire extinguishing agent units 300 heated by the battery manager 500 may generate a solid aerosol including potassium radicals, and the other fire extinguishing agent units 300 may receive heat through the medium 400 and may sequentially generate solid aerosols.

[0120] The battery manager 500 may include a heater 510. The heater 510 may be attached to at least one of the fire extinguishing agent units 300, and the battery manager 500 may control the heater 510 to heat the fire extinguishing agent units 300.

[0121] The battery manager 500 may include one or more suitable types of battery management systems, and may include a temperature sensor for sensing the temperature of the unit cells 100 and a heating element for heating at least one of the fire extinguishing agent units 300, but is not limited thereto.

[0122] For example, the rechargeable battery pack 1003 according to other embodiments may include a battery manager 500 for sensing the temperature of the unit cells 100, heating at least one of the fire extinguishing agent units 300, and sequentially generating solid aerosols from the fire extinguishing agent units 300, thereby actively extinguishing the burning unit cells 100 in the unit cells 100 or the unit cells 100 that may burn with a high probability in the unit cells 100.

[0123] The medium 400 may connect the gaps between the fire extinguishing agent units 300 to transfer heat between the fire extinguishing agent units 300. The fire extinguishing agent units 300 may be sequentially heated at a set or predetermined temperature through the medium 400 to sequentially generate solid aerosols in the internal space 210 of the housing 200. Therefore, the rechargeable battery pack 1003 according to other embodiments may effectively extinguish the burning unit cells 100 in the unit cells 100.

[0124] The unit volume weight (g / L) of the first fire extinguishing agent unit 300 in the internal space 210 of the housing 200 may satisfy Equation 1. The maximum temperature, the maximum temperature duration of the burning unit cell, and the temperature of the unit cells arranged around the burning unit cell may become the lowest. Therefore, the rechargeable battery pack 1003 according to other embodiments may actively extinguish the burning unit cells 100 in the unit cells 100.

[0125] The rechargeable battery pack 1003 according to other embodiments may include a configuration having numerical limit thresholds, wherein the volume of the internal space 210 of the housing 200 is about 10 L, and the weight of the first fire extinguishing agent unit 300 is about 1 g to about 32 g, so as to actively extinguish the unit cell 100 that is burning in the unit cells 100.

[0126] The rechargeable battery pack 1003 according to other embodiments may include a configuration having numerical limit thresholds, wherein the distance between the first fire extinguishing agent unit 300 and the unit cells 100 is about 2 mm to about 70 mm, so as to actively extinguish the unit cell 100 that is burning in the unit cells 100.

[0127] The rechargeable battery pack 1003 according to other embodiments may include a configuration having numerical limit thresholds, wherein the distance between the first fire extinguishing agent unit 300 and the unit cells 100 is about 2 mm to about 32 mm, so as to actively extinguish the unit cell 100 that is burning in the unit cells 100.

[0128] The rechargeable battery pack 1003 according to other embodiments may include a configuration having numerical limit thresholds, wherein the distance between the first fire extinguishing agent unit 300 and the unit cells 100 is about 20 mm, so as to actively extinguish the unit cell 100 that is burning in the unit cells 100.

[0129] A rechargeable battery pack 1003 is provided for actively extinguishing the unit cell 100 that is burning in the unit cells 100.

[0130] Although the embodiments of the present disclosure have been described in connection with what are presently considered to be practical example embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments, but is intended to cover one or more suitable modifications and equivalent arrangements included within the scope of the claims and their equivalents.

Claims

1. A rechargeable battery pack comprising: A plurality of unit cells are adjacent to each other; a housing including an inner space for accommodating the plurality of unit batteries; a plurality of fire extinguishing agent units spaced apart from the plurality of unit cells and configured to generate a solid aerosol at a set temperature; as well as A medium is between the plurality of fire extinguishing agent units.

2. The rechargeable battery pack according to claim 1, wherein The medium includes a heat transfer unit for transferring heat between the plurality of fire extinguishing agent units.

3. The rechargeable battery pack according to claim 2, wherein The heat transfer unit connects the plurality of fire extinguishing agent units.

4. The rechargeable battery pack according to claim 2, wherein The plurality of fire extinguishing agent units are spaced apart from each other by a distance equal to or greater than 70 mm, and the heat transfer unit is located between the plurality of fire extinguishing agent units.

5. The rechargeable battery pack according to claim 1, wherein The medium includes a heat delay unit for blocking gaps between the plurality of fire extinguishing agent units.

6. The rechargeable battery pack according to claim 5, wherein The thermal delay unit covers the gaps between the plurality of fire extinguishing agent units.

7. The rechargeable battery pack according to claim 5, wherein The plurality of fire extinguishing agent units overlap each other, and the thermal delay unit is located between the plurality of fire extinguishing agent units.

8. The rechargeable battery pack according to claim 1, wherein The weight of the first fire extinguishing agent unit among the plurality of fire extinguishing agent units satisfies equation 1: Y=0.0088X+0.211 in, Y is the unit volume weight of the first fire 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.

9. The rechargeable battery pack according to claim 8, wherein In equation 1, X satisfies equation 2: X=V×6.8 / Z in, V is a battery capacity of one of the plurality of unit batteries, in Wh, and Z is a volume of the internal space of the housing, in L.

10. The rechargeable battery pack according to claim 8, wherein The internal space of the housing has a set volume of 6.8L.

11. The rechargeable battery pack according to claim 1, wherein A distance between a first fire extinguishing agent unit among the plurality of fire extinguishing agent units and the unit cell is 2 mm to 70 mm.

12. The rechargeable battery pack according to claim 11, wherein The distance between the first fire extinguishing agent unit and the unit cell is 2 mm to 32 mm.

13. The rechargeable battery pack according to claim 11, wherein The distance between the first fire extinguishing agent unit and the unit cell is 20 mm.

14. The rechargeable battery pack according to claim 1, wherein The solid aerosol includes potassium radicals.

15. The rechargeable battery pack according to claim 1, wherein The fire extinguishing agent unit includes a mixture of a potassium compound and a resin.

16. The rechargeable battery pack according to claim 15, wherein The fire extinguishing agent unit further includes a mesh supporting the mixture.

17. The rechargeable battery pack according to claim 16, wherein The mesh is configured to penetrate the mixture.

18. The rechargeable battery pack according to claim 1, wherein A first fire extinguishing agent unit of the plurality of fire extinguishing agent units is in the interior space of the housing, and A second fire extinguishing agent unit among the plurality of fire extinguishing agent units is in the second interior space of the second housing.

19. The rechargeable battery pack according to claim 1, further comprising: a battery manager connected to the unit battery and the fire extinguishing agent unit and between the unit battery and the fire extinguishing agent unit, The battery manager is configured to sense the temperature of the unit cells, and is configured to heat one of the plurality of fire extinguishing agent units in response to the temperature of one of the plurality of unit cells being higher than the set temperature.

20. The rechargeable battery pack according to claim 19, wherein The battery manager includes a heater attached to the extinguishing agent unit, and The battery manager is configured to control the heater to heat the fire extinguishing agent unit.

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