Battery pack

Abstract

The present application may provide a battery pack comprising: one or more cell unit bodies; a frame portion including a peripheral frame surrounding an inner space in which the cell unit body is mounted; and an extension unit provided in a partial region of the frame portion, the peripheral frame including: a support frame; the inner channel is defined by the supporting frame, and gas can pass through the inner channel; the inner channel is communicated with the outside of the peripheral frame through the through hole, the extension unit comprises an extension frame and an extension channel, the gas can pass through the extension channel, and the extension channel is formed by being surrounded by the extension frame and is communicated with the inner channel.

Description

Technical Field

[0001] The present application relates to a battery pack. In addition, the present application relates to an application of the battery pack. Background Art

[0002] In recent years, the demand for mobile devices such as smartphones, tablets, and wireless headphones has continued to increase. In addition, with the rapid development of electric vehicles, energy storage batteries, robots, and satellites, research on high-performance secondary batteries that can be repeatedly charged and discharged as energy sources is also being actively carried out.

[0003] Currently, commercial secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries and lithium secondary batteries. Among them, compared with nickel-based secondary batteries, lithium secondary batteries have almost no memory effect, so they can be charged and discharged freely, and have a very low self-discharge rate and high energy density.

[0004] On the other hand, a battery pack may include more than one battery cell unit and may include various control devices for controlling the battery cell unit. The control device generally includes a battery management system (BMS) and may also include a cooling system. As an example of such a battery pack, reference may be made to Patent Document 1.

[0005] In the battery pack, the cell unit may experience thermal runaway due to mechanical anomalies, electrical anomalies, thermal anomalies or internal short circuits. Before the thermal runaway occurs, a large amount of gas is generated in the cell unit. If the interior of the battery pack is in a high-voltage state due to the large amount of gas that cannot be discharged to the outside, an explosion or a larger fire may occur due to the high-voltage short circuit.

[0006] Prior art literature

[0007] Patent Literature

[0008] (Patent Document 1) Korean Patent Publication No. 10-2022-0142853 (Invention Title: Battery Pack and Method of Manufacturing the Same)

[0009] (Patent Document 2) Korean Patent Publication No. 10-2022-0150693 (Invention Title: High-voltage battery module with excellent cooling efficiency)

[0010] Non-patent literature

[0011] (Non-Patent Document 1) Proceedings of the American Academy of Arts and Sciences. 31: 218–233 (“Melting Points of Aluminum, Silver, Gold, Copper, and Platinum”, Holman, SW; Lawrence, RR; Barr, L., January 1, 1895) Utility Model Content

[0012] 1. Technical issues to be resolved

[0013] The object of the present application is to provide a battery pack that can prevent danger caused by a large amount of gas. In addition, the object of the present application is to provide a battery pack that exhausts gas and prevents internally generated flames from being exposed to the outside. In addition, the object of the present application is to provide an electrical device including more than one battery pack.

[0014] (II) Technical solution

[0015] According to an example of the present application, a battery pack may include: one or more battery cell units; a frame portion, including a peripheral frame, the peripheral frame surrounding an internal space in which the battery cell units are installed; and an extension unit, arranged in a portion of the frame portion, the peripheral frame including: a support frame; an internal channel formed by being surrounded by the support frame, through which gas can pass; and a through hole connecting the internal channel and the outside of the peripheral frame, the extension unit including an extension frame and an extension channel, through which gas can pass, the extension channel being formed by being surrounded by the extension frame and interconnected with the internal channel.

[0016] A battery pack according to one example of the present application may satisfy the following Formula 1.

[0017] [Formula 1]

[0018] T≤T A

[0019] In formula 1, T refers to the temperature of the cell unit (T I ) is the temperature measured in the through hole when it is above 200℃ (unit: ℃), T A Refers to 800°C as the reference temperature.

[0020] In a battery pack according to an example of the present application, the temperature of the cell unit (T I) may be above 200°C, and the temperature (T, unit: °C) measured in the through hole is similar to the temperature of the cell unit (T I , unit: °C) ratio (T / T I ) can be in the range of 0.1 to 0.7.

[0021] In a battery pack according to one example of the present application, the extension unit may be provided in a partial region of the peripheral frame.

[0022] In a battery pack according to an example of the present application, the extension unit may further include a first inlet and outlet channel and a second inlet and outlet channel, so that the extension channel and the internal channel are interconnected, the first inlet and outlet channel and the second inlet and outlet channel are opposite to each other, and the extension unit satisfies the following formula 2.

[0023] [Formula 2]

[0024] L G >L U

[0025] In formula 2, L U Refers to the straight-line distance between the first access channel and the second access channel, L G Refers to the length of the extended channel.

[0026] In a battery pack according to an example of the present application, the extension unit may include one or more partitions, and the partitions may be connected to the extension frame to block the passage of gas.

[0027] In a battery pack according to one example of the present application, the extension unit may further include a plurality of partitions.

[0028] In a battery pack according to one example of the present application, the extension unit may be coupled to and fixed to the frame part.

[0029] In a battery pack according to one example of the present application, the extension unit may include a material having a melting point of 550° C. or more.

[0030] In a battery pack according to an example of the present application, at least a portion of a battery cell unit may be in contact with a peripheral frame, and at least a portion of the area of ​​the battery cell unit in contact with the peripheral frame may include an exhaust hole connected to an internal channel, and the gas generated in the battery cell unit may flow into the internal channel through the exhaust hole.

[0031] In a battery pack according to an example of the present application, the extension unit may be located in the through hole (H 1 ) and the adjacent discharge hole (H 2 ) between the adjacent discharge holes (H 2) is the closest to the through hole (H 1 ) discharge hole.

[0032] In a battery pack according to one example of the present application, the extension unit may be located in a region satisfying the following Formula 3.

[0033] [Formula 3]

[0034] L 2 >L 1

[0035] In formula 3, L 1 It refers to the area along the extension unit and the through hole (H 1 ) between the internal passages, L 2 It refers to the distance between the extension unit and the adjacent discharge hole (H 2 ) between the internal passages.

[0036] In a battery pack according to an example of the present application, the frame portion may further include one or more cross members spanning the internal space, and at least a portion of the battery cell unit may be in contact with the cross members.

[0037] In a battery pack according to an example of the present application, a cross member can be joined and fixed to a peripheral frame, and the cross member may include: a support member; and a cross channel formed by the support member, through which gas can pass, and at least a portion of the area in which the battery cell unit contacts the cross member may include an exhaust hole connected to the cross channel, and the gas generated in the battery cell unit can flow into the cross channel through the exhaust hole.

[0038] In a battery pack according to one example of the present application, an internal channel of the peripheral frame and a transverse channel of the transverse member may communicate with each other.

[0039] The battery pack according to an example of the present application may further include a sealing member, and the sealing member may be located in a region where the extension unit and the frame portion are coupled to each other.

[0040] (III) Beneficial effects

[0041] The present application may provide a battery pack that can prevent danger caused by a large amount of gas. In addition, the present application may provide a battery pack that discharges gas and prevents internally generated flames from being exposed to the outside. In addition, the present application may provide an electrical device including more than one battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a diagram simply showing a cross section of a battery pack according to one example of the present application.

[0043] Figure 2 is a diagram simply showing a peripheral frame of a battery pack according to one example of the present application.

[0044] Figure 3 FIG. 1 is a diagram simply showing an extension unit of a battery pack according to an example of the present application.

[0045] Figure 4 FIG. 1 is a diagram simply showing a peripheral frame and an extension unit of a battery pack according to one example of the present application.

[0046] Figure 5 FIG. 1 is a diagram simply showing a peripheral frame and an extension unit of a battery pack according to one example of the present application.

[0047] Figure 6 Shown along Figure 5 The cross section taken along line AA′ in FIG. 1 is a diagram that simply shows a peripheral frame and an extension unit of a battery pack according to an example of the present application.

[0048] Figure 7 Shown with Figure 6 A different example is a diagram of a peripheral frame and an extension unit of a battery pack according to an example of the present application.

[0049] Figure 8 is a diagram simply showing a cross section of a battery pack according to one example of the present application.

[0050] Fig. 9 FIG. 1 is a diagram that simply shows a part of a cross section of a battery pack according to an example of the present application.

[0051] Description of Reference Numerals

[0052] 10: Battery pack 100: Cell unit

[0053] 100T: Thermal runaway cell unit 110, H 1 : Discharge hole

[0054] 200: frame part 210: outer frame

[0055] 211: First frame 212: Second frame

[0056] 213: Through hole 214: Support frame

[0057] 215: Internal channel 220: Cross member

[0058] 221: Support member 222: Horizontal channel

[0059] 223: discharge hole 224: connection hole

[0060] 300: Extension unit 310: Extension frame

[0061] 320: Extension channel 330: Access channel

[0062] 331: First access channel 332: Second access channel

[0063] 340: partition 400: fixing part

[0064] 500: Seal 600: Control device DETAILED DESCRIPTION

[0065] The structural or functional descriptions of the embodiments disclosed in this application are only used to illustrate the embodiments according to the technical ideas of this application. In addition, the embodiments according to the technical ideas of this application can be implemented in various forms other than the embodiments disclosed in this application. In addition, the technical ideas of this application should not be interpreted as being limited to the embodiments described in this application.

[0066] Among the physical properties mentioned in the present application, when measuring the effect of temperature on the physical properties, unless otherwise defined, the physical properties are physical properties measured at normal temperature and pressure.

[0067] The term "normal temperature" used in the present application refers to a natural temperature without heating or cooling, for example, a temperature in the range of 10° C. to 30° C., for example, a temperature of about 15° C. or more, about 18° C. or more, about 20° C. or more, about 23° C. or more, about 27° C. or less, or 25° C. In the present specification, unless otherwise defined, the unit of temperature is Celsius (° C.).

[0068] Among the physical properties mentioned in the present application, when measuring the influence of pressure on the physical property, the physical property is the physical property measured under normal pressure unless otherwise defined.

[0069] The term "normal pressure" used in the present application refers to a natural pressure without being pressurized or reduced, and generally, a gas pressure within a range of about 700 mmHg to 800 mmHg is referred to as normal pressure.

[0070] The term "a to b" used in the present application refers to a range between and including a and b. For example, comprising a to b in parts by weight has the same meaning as being within the range of a to b in parts by weight.

[0071] The present application can provide a battery pack 10 (refer to Figure 1 ), which can prevent the large amount of gas G (refer to Figure 1 ) and the resulting danger (see Figure 1). In addition, the present application may provide a battery pack 10 that can exhaust the gas G and prevent the flame generated inside from being exposed to the outside. In addition, the present application may provide an electrical device that includes more than one battery pack 10. The gas G may be generated in the battery cell unit 100 due to the thermal runaway phenomenon.

[0072] Figure 1 FIG. 1 is a diagram showing a simplified cross section of a battery pack 10 according to an example of the present application. Figure 1 According to an example of the present application, a battery pack 10 may include more than one battery cell unit 100. In addition, the battery pack 10 may include a plurality of battery cell units 100. The battery cell unit 100 may include more than one battery cell, or may include a plurality of battery cells. In addition, the battery cell unit 100 may be a collection of battery cells, or a so-called battery module in which the collected battery cells are placed in a housing. Patent document 2 discloses an example of a battery module. In addition, a plurality of battery cell units 100 may be electrically connected to each other in series, in parallel, or in a combination thereof. In addition, in the battery cell unit 100, a plurality of battery cells may be electrically connected to each other in series, in parallel, or in a combination thereof.

[0073] The term "electrical connection" used in this application may refer to a state in which a circuit is formed when connected objects are connected through a connecting device so that current can flow through each of the connected objects. The connecting device is not particularly limited as long as it can achieve electrical connection, and may be direct contact between the connected objects or an electric wire through which current can flow.

[0074] In the battery pack 10, the battery cell unit 100 can be placed on a plate (not shown). The plate is flat and can include a metal material, and the metal material can include aluminum. A frame portion 200 described later can also be placed on the plate. The frame portion 200 can be placed on the plate and connected to the plate. In addition, an internal threaded hole can be formed in the frame portion 200 so as to be connected to the plate, and the plate can include a hole at a position corresponding to the internal threaded hole so that a bolt passes through the plate and is inserted into the internal threaded hole. Alternatively, the frame portion 200 can be interconnected with the plate by an adhesive or welding. Specifically, the peripheral frame 210 and the cross member 220 in the frame portion 200 described later can be placed on the plate and connected to the plate, and the connection method is the same as the above method.

[0075] Although in Figure 1Although not shown in the figure, the battery pack 10 may further include a cover portion (not shown) for protecting the surface opposite to the surface placed on the plate. The cover portion may be connected to at least a portion of the frame portion 200. In addition, in order to connect the cover portion and the frame portion 200, the cover portion and the frame portion 200 may include holes (for combining with bolts and nuts) at appropriate positions corresponding to each other, or the cover portion and the frame portion 200 may be connected to each other by adhesive or welding.

[0076] Reference Figure 1 According to an example of the present application, a battery pack 10 may include a control device 600. The control device 600 may include a battery management system (BMS) and may further include a cooling system. In addition, the control device 600 may be electrically connected to one or more installed battery cell units 100, and the control device 600 may control the state and function of the battery cell unit 100. The control method may apply a method known in the art.

[0077] Reference Figure 1 , the battery pack 10 according to an example of the present application may include a frame portion 200. The frame portion 200 may include a peripheral frame 210. In addition, the peripheral frame 210 may surround the inner space in which the battery cell unit 100 is installed. Figure 1 The internal space may be determined according to the shape of the outer frame 210 of the frame portion 200. The shape of the frame portion 200 may be determined by considering the battery cell unit 100 and the control device 600.

[0078] Reference Figure 1 , the peripheral frame 210 may include a pair of first frames 211 parallel to a first direction and a pair of second frames 212 parallel to a second direction, and the first direction may be perpendicular to the second direction. The first frame 211 and the second frame 212 may be directly or indirectly connected to each other. The first frame 211 and the second frame 212 may include holes at appropriate positions corresponding to each other, and may be directly connected by bolts and nuts. In addition, the first frame 211 and the second frame 212 may be directly connected by adhesive or welding. In addition, the first frame 211 and the second frame 212 may be indirectly connected by other components. The components may be connected to the first frame 211 and the second frame 212, so that the first frame 211 and the second frame 212 may be indirectly connected. In addition, when the first frame 211 and the second frame 212 are connected to each other, an internal space in which the battery cell unit 100 can be installed may be formed. That is, the peripheral frame 210 may surround the internal space in which the battery cell unit 100 is installed.

[0079] Figure 2FIG. 2 is a diagram showing a simplified diagram of a peripheral frame 210 of a battery pack 10 according to an example of the present application. Figure 2 In a battery pack 10 according to an example of the present application, the peripheral frame 210 may include a support frame 214 and an internal channel 215. The internal channel 215 may be formed by being surrounded by the support frame 214, and the gas G may pass through the internal channel 215. Figure 1 In the battery pack 10 according to an example of the present application, the peripheral frame 210 may include a through hole 213. The through hole 213 may communicate the internal channel 215 with the outside of the peripheral frame 210.

[0080] Reference Figure 2 , the peripheral frame 210 of the battery pack 10 may include a support frame 214 and an internal channel 215. The support frame 214 may include a metal material, and the metal material may include aluminum. In addition, the support frame 214 may determine the shape of the peripheral frame 210 and may have a structure in which a hollow space is formed inside the peripheral frame 210. Figure 2 , the support frame 214 can form an internal channel 215, and the gas G can pass through the internal channel 215. That is, the internal channel 215 can be formed by being surrounded by the support frame 214. The shape of the internal channel 215 is not particularly limited, and can be designed by various methods as needed. The shape of the internal channel 215 can be determined by the shape of the support frame 214. The internal channel 215 can allow not only the gas G to pass through, but also particles to pass through. Here, the particles that can pass through the internal channel 215 can refer to particles that can pass through the exhaust hole 110 described later (refer to Figure 8 ) of a solid state substance of a certain size (particle size).

[0081] Reference Figure 1 At least a portion of the battery cell unit 100 in the battery pack 10 may be in contact with the peripheral frame 210. Figure 1 In the battery pack 10, the upper and lower surfaces of the cell unit 100 are in contact with the first frame 211, the control device 600 is further in contact with the second frame 212 located at the front, and the cell unit 100 farthest from the control device 600 is further in contact with the second frame 212 located at the rear.

[0082] In addition, refer to Figure 1In the battery pack 10, the frame portion 200 may further include one or more transverse members 220 spanning the internal space. The transverse members 220 may be parallel to the first direction or parallel to the second direction. In addition, the frame portion 200 may further include a transverse member 220 parallel to the first direction and a transverse member 220 parallel to the second direction spanning the internal space. Figure 1 , a plurality of transverse members 220 may be provided, and may be provided parallel to the second direction. The transverse member 220 may separate the battery cell units 100, or may separate the battery cell units 100 and the control device 600. The transverse member 220 may include a metal material, and the metal material may include aluminum. Figure 1 In the battery pack 10, at least a portion of the battery cell unit 100 may be in contact with the cross member 220. Figure 1 In the battery pack 10 , the front surface, the rear surface, or the front and rear surfaces of the battery cell unit 100 are in contact with the cross member 220 .

[0083] In the battery pack 10 according to one example of the present application, the cross member 220 may be connected to the peripheral frame 210. The cross member 220 and the peripheral frame 210 may contact each other, may include holes at appropriate positions corresponding to each other, and may be connected by the holes and bolts and nuts. In addition, the cross member 220 and the peripheral frame 210 may be connected by an adhesive or welding. In addition, the cross member 220 may be combined and fixed to the peripheral frame 210. Here, combining and fixing may refer to connecting and fixing by contacting each other.

[0084] Reference Figure 1 The transverse member 220 of the battery pack 10 may include a support member 221 and a transverse channel 222 (refer to Fig. 9 ). The support member 221 may include a metal material, and the metal material may include aluminum. In addition, the support member 221 may determine the shape of the transverse member 220, and may have a structure that forms a hollow space inside the transverse member 220. The support member 221 may form a transverse channel 222, and the gas G may pass through the transverse channel 222. That is, the transverse channel 222 may be formed by being surrounded by the support member 221. The morphology of the transverse channel 222 is not particularly limited, and may be designed by various methods as needed. The morphology of the transverse channel 222 may be determined by the morphology of the support member 221. The transverse channel 222 may allow not only gas to pass through, but also particles to pass through. Here, the particles that can pass through the transverse channel 222 may refer to particles that can pass through the exhaust hole 223 described later (refer to Fig. 9 ) of a solid phase substance of a certain size (particle size).

[0085] In a battery pack 10 according to an example of the present application, at least a portion of the cell unit 100 may be in contact with the peripheral frame 210, and at least a portion of the region where the cell unit 100 is in contact with the peripheral frame 210 may include a discharge hole 110 communicating with the internal channel 215 of the peripheral frame 210. Specifically, the cell unit 100 may include a housing for accommodating the cell, and the discharge hole 110 may be provided in the housing. In addition, the peripheral frame 210 may include a hole at a position corresponding to the discharge hole 110 provided in the cell unit 100, so that the gas G generated in the cell unit 100 may enter the internal channel 215 through the discharge hole 110. The cell unit 100 and the internal channel 215 may be in communication with each other through the discharge hole 110 provided in the cell unit 100 and a hole provided in the peripheral frame 210 at a position corresponding to the discharge hole 110.

[0086] In addition, refer to Figure 8 According to an example of the present application, a battery pack 10 may include a plurality of battery cell units 100, and each of the battery cell units 100 may include a discharge hole 110 communicating with the internal channel 215 of the peripheral frame 210. In addition, each of the battery cell units 100 may include more than one discharge hole 110, may include more than one discharge hole 110 in the same direction, or may include more than one discharge hole 110 in different directions. For example, in the battery pack 10, the upper and lower surfaces of each battery cell unit 100 are in contact with the first frame 211, and each independent battery cell unit 100 may be provided with more than one discharge hole 110 on the upper surface, the lower surface, or a portion of the upper and lower surfaces in the region in contact with the first frame 211. In the battery pack 10, the gas G generated in the battery cell unit 100 may enter the internal channel 215 through the discharge hole 110.

[0087] In a battery pack 10 according to an example of the present application, at least a portion of a battery cell unit 100 may be in contact with a transverse member 220, and at least a portion of the region in which the battery cell unit 100 is in contact with the transverse member 220 may include a discharge hole 223 that is connected to a transverse channel 222 of the transverse member 220. Specifically, the battery cell unit 100 may include a housing for accommodating battery cells, and the above-mentioned discharge hole 223 may be provided in the housing. In addition, the transverse member 220 may include a hole at a position corresponding to the discharge hole 223 provided in the battery cell unit 100, so that the gas G generated in the battery cell unit 100 can flow into the transverse channel 222 through the discharge hole 223. The battery cell unit 100 and the transverse channel 222 may be connected to each other through the discharge hole 223 provided in the battery cell unit 100 and a hole provided in the transverse member 220 at a position corresponding to the discharge hole 223 (refer to Fig. 9 ).

[0088] In addition, refer to Figure 8 According to an example of the present application, the battery pack 10 may include a plurality of battery cell units 100, each of which may include a discharge hole 223 (see Fig. 9 ). In addition, each of the battery cell units 100 may include more than one discharge hole 223, may include more than one discharge hole 223 in the same direction, or may include more than one discharge hole 223 in different directions. For example, in the battery pack 10, the front surface and the rear surface of each battery cell unit 100 are in contact with the cross member 220, respectively, and each independent battery cell unit 100 may be provided with more than one discharge hole 223 in the front surface, the rear surface, or a portion of the front surface and the rear surface in the area in contact with each of the cross members 220.

[0089] In the battery pack 10 according to one embodiment of the present application, the cross member 220 is connected to the peripheral frame 210, and the internal channel 215 of the peripheral frame 210 and the cross channel 222 of the cross member 220 can be communicated with each other (refer to Fig. 9 ). Reference Fig. 9 Specifically, the transverse member 220 and the peripheral frame 210 may be connected, and the transverse member 220 and the peripheral frame 210 may each include a connection hole 224, and each of the connection holes 224 may be arranged at a position corresponding to each other, so that the internal channel 215 and the transverse channel 222 are interconnected. The gas G generated in the battery cell unit 100 may enter the transverse channel 222 of the transverse member 220 through the discharge hole 223, and the gas G entering the transverse channel 222 may enter the internal channel 215 of the peripheral frame 210 through the connection hole 224 (refer to Fig. 9 ).

[0090] Figure 3 FIG. 1 is a diagram showing a simplified extension unit 300 of a battery pack 10 according to an example of the present application. Figure 1 and Figure 3 , a battery pack 10 according to an example of the present application may include an extension unit 300. The extension unit 300 may be disposed in a portion of the frame portion 200. The frame portion 200 may form an appropriate space so that the extension unit 300 is disposed in the space. In addition, the extension unit 300 may be disposed in an internal channel 215 formed by the frame portion 200, and may be disposed at least on the inner side of the support frame 214. The battery pack 10 includes the extension unit 300, which can prevent dangers caused by a large amount of gas G, and can discharge the gas G and prevent the flame generated inside from being exposed to the outside.

[0091] In the battery pack 10 according to one example of the present application, the extension unit 300 may be specifically provided in a part region of the peripheral frame 210 of the frame portion 200. Figure 1 , the extension unit 300 is disposed in a portion of the peripheral frame 210. Figure 1 In the embodiment, the extension unit 300 is disposed at the front of the battery pack 10, but in another example, the extension unit may be disposed at the rear. In addition, in the battery pack 10, the extension unit 300 may be disposed in a region adjacent to a region where the through hole 213 is disposed in a portion of the peripheral frame 210. The position of the extension unit 300 is not particularly limited, and may be disposed in a portion of the peripheral frame 210 by considering the position of the through hole 213.

[0092] A battery pack 10 according to an example of the present application may satisfy the following Formula 1. The battery pack 10 includes the extension unit 300 , so that Formula 1 may be satisfied.

[0093] [Formula 1]

[0094] T≤T A

[0095] In formula 1, T refers to the temperature T of the battery cell unit 100. I The temperature measured in the through hole 213 when the temperature is above 200°C (unit: °C), T A Refers to 800°C as the reference temperature.

[0096] In the above, the temperature T of the battery cell unit 100 is Iis 200°C or more, 220°C or more, 240°C or more, 260°C or more, 280°C or more, 300°C or more, 350°C or more, 400°C or more, 450°C or more, or 1500°C or less, 1400°C or less, 1300°C or less, 1200°C or less, 1100°C or less, 1000°C or less, 950°C or less, 900°C or less, 850°C or less, 800°C or less, 750°C or less, or 700°C or less. In addition, the temperature T of the cell unit 100 is I The temperature can be known from the value measured by the temperature measuring device in the control device 600. Alternatively, the temperature can be directly measured on the battery cell unit 100 (for example, using an infrared thermometer, etc.). In addition, if the temperature T of the battery cell unit 100 is I If the temperature of the battery cell unit 100 is within the above range, it can be considered that the so-called thermal runaway phenomenon has occurred. In addition, if there are multiple battery cell units 100, the temperature T of the battery cell unit 100 can be measured based on the battery cell unit 100 that first reaches 200°C. I .

[0097] The T A It may refer to a temperature lower than the temperature measured in the through hole 213 without the extension unit 300 when the thermal runaway phenomenon occurs in the battery cell unit 100. That is, the T A It may be a reference temperature, which is used to determine whether the flame is exposed to the outside when the battery cell unit 100 generates flames due to thermal runaway. I When the temperature T measured in the through hole 213 is lower than T A , it can be considered that the battery pack 10 prevents the flame from being exposed to the outside.

[0098] As described above, when the peripheral frame 210 is extended without the extension unit 300, the flame generated by the thermal runaway phenomenon in the battery cell unit 100 may be exposed to the outside through the through hole 213, and the temperature measured in the through hole 213 due to the flame may be in the range of about 900° C. to 1000° C. A It can be determined based on the temperature measured in the through hole 213 when the flame is exposed. Taking this into account, the T A It can be a specific number of below 790°C, below 780°C, below 770°C, below 760°C, below 750°C, below 740°C, below 730°C, below 720°C, below 710°C, below 700°C, below 690°C, below 680°C, below 670°C, below 660°C, below 650°C, below 640°C, below 630°C, below 620°C, or below 610°C.

[0099] The battery pack 10 according to an example of the present application includes the extension unit 300, so that the flame can be prevented from being exposed to the outside, and thus the temperature measured in the through hole 213 can be lower than the temperature measured in the through hole 213 without the extension unit 300. That is, even in the case of thermal runaway, the temperature measured in the through hole 213 can be equal to or lower than the reference temperature T A , and this is defined by Formula 1 above.

[0100] In addition, in the above, the temperature T measured in the through hole 213 can be based on the temperature measured at a point P corresponding to the center of gravity of the object when an object in the form of the through hole 213 is assumed to exist. The temperature T measured in the through hole 213 can be measured by placing a thermometer at the point P.

[0101] In a battery pack 10 according to an example of the present application, the temperature T I is above 200°C, the temperature T (°C) measured in the through hole is equal to the temperature T of the cell unit I (℃) ratio T / T I The battery pack 10 includes the extension unit 300, so that the temperature ratio T / T I In addition, when the temperature ratio T / T I When the temperature is within the above range, it is considered that the gas G is exhausted and the flame generated inside is prevented from being exposed to the outside. In addition, the battery pack 10 can prevent the flame generated by the thermal runaway phenomenon from being exposed to the outside.

[0102] Reference Figure 3 In a battery pack 10 according to an example of the present application, the extension unit 300 may include an extension channel 320, through which the gas G may pass. In addition, the extension unit 300 may include an extension frame 310. The extension channel 320 may be formed by being surrounded by the extension frame 310, through which the gas G may pass. In addition, referring to Figure 3 The extension unit 300 may include an access channel 330 , and may include a partition plate 340 forming the extension channel 320 .

[0103] In the battery pack 10 according to an example of the present application, the extension channel 320 of the extension unit 300 may be interconnected with the internal channel 215 of the peripheral frame 210. As described above, the extension unit 300 may include an inlet and outlet channel 330 (refer to Figure 3 ). Reference Figure 3The access channel 330 of the extension unit 300 can make the extension channel 320 and the internal channel 215 communicate with each other.

[0104] Reference Figure 3 In a battery pack 10 according to an example of the present application, the extension unit 300 may include an access channel 330, so that the extension channel 320 and the internal channel 215 are interconnected, and the access channel 330 may include a first access channel 331 and a second access channel 332. In addition, referring to Figure 3 The first inlet and outlet channel 331 and the second inlet and outlet channel 332 may be arranged opposite to each other. When the first inlet and outlet channel 331 and the second inlet and outlet channel 332 are arranged opposite to each other, it is more conducive to exhausting the gas G and preventing the flame generated inside from being exposed to the outside.

[0105] In the battery pack 10 according to an example of the present application, the length of the extension channel 320 may be longer than the length of the long side of the extension unit 300. The long side may refer to the longest side. By making the length of the extension channel 320 longer than the length of the long side of the extension unit 300, it is more conducive to exhausting the gas G and preventing the flame generated inside from being exposed to the outside.

[0106] In the battery pack 10 according to one example of the present application, the extension unit 300 may satisfy the following formula 2. When the extension unit 300 satisfies the following formula 2, it may be more advantageous to discharge the gas G and prevent the flame generated inside from being exposed to the outside.

[0107] [Formula 2]

[0108] L G >L U

[0109] In formula 2, L U refers to the straight-line distance between the first access channel 331 and the second access channel 332, L G Refers to the length of the extension channel 320.

[0110] In the above, the first inlet and outlet channel 331 and the second inlet and outlet channel 332 each have a width in the horizontal direction in which the gas G flows in, and the length of the straight line formed when connecting points of 1 / 2 of the width can be referred to as L. U . Reference Figure 3 , it can be confirmed that L U In addition, the length of the extension channel 320 may refer to the shortest distance that the gas G flowing into the extension channel 320 moves.

[0111] Reference Figure 3In the battery pack 10 according to an example of the present application, the extension unit 300 may include more than one partition 340. In addition, the partition 340 may be provided in plurality, that is, in the battery pack 10, the extension unit 300 may include a plurality of partitions 340.

[0112] Reference Figure 3 , the partition 340 may be connected to the extension frame 310. The partition 340 and the extension frame 310 may contact each other, may include holes at appropriate positions corresponding to each other, and may be connected by the holes and bolts and nuts. In addition, the partition 340 and the extension frame 310 may be connected by an adhesive or welding. In addition, the partition 340 may be a part of the extension frame 310, and the extension frame 310 provided with the partition 340 may be manufactured by extrusion or the like. In addition, the partition 340 may be combined and fixed to the extension frame 310, where combining and fixing may refer to being connected and fixed by contacting each other. The extension unit 300 may obstruct the passage of the gas G by the partition 340. Since the partition 340 obstructs the passage of the gas G, the path of the gas G may be extended, and in this way, it may be more conducive to exhausting the gas G and preventing the flame generated inside from being exposed to the outside.

[0113] Figure 4 FIG. 2 is a diagram that simply shows the outer frame 210 and the extension unit 300 of the battery pack 10 according to one example of the present application. Figure 4 , the extension unit 300 may be engaged and fixed to the frame portion 200. Specifically, the extension unit 300 may be engaged and fixed to the peripheral frame 210 of the frame portion 200. The extension unit 300 may contact the frame portion 200, may include holes at appropriate positions corresponding to each other, and may be engaged and fixed through the holes and the fixing portion 400 (refer to Figure 5 ). Here, the hole may be formed on the partition plate 340. The fixing portion 400 may be a bolt and a nut, etc. In addition, the extension unit 300 may be bonded and fixed to the frame portion 200 by an adhesive or welding.

[0114] In addition, the extension unit 300 may be disposed in the inner channel 215 formed by the frame portion 200 and may be coupled and fixed to the frame portion 200 in the inner channel 215. Specifically, the extension unit 300 may be disposed at least inside the support frame 214 and may be coupled and fixed to the support frame 214.

[0115] Although not shown in the figure, in the battery pack 10 according to an example of the present application, the extension unit 300 can also be engaged and fixed in the cross member 220 of the frame part 200 in the same manner as described above. Hereinafter, the description of the peripheral frame 210 of the frame part 200 and the extension unit 300 also applies to the cross member 220.

[0116] Reference Figure 4 The peripheral frame 210 of the frame part 200 can form a suitable space so that the extension unit 300 can be inserted into the space. The extension unit 300 is brought close to the space, and the extension unit 300 is joined and fixed to a part of the peripheral frame 210 by the above-mentioned fixing method.

[0117] Figure 5 FIG. 2 is a diagram that simply shows the outer frame 210 and the extension unit 300 of the battery pack 10 according to one example of the present application. Figure 5 , the extension unit 300 and the peripheral frame 210 are joined and fixed. Figure 5 In the battery pack 10 shown, the extension unit 300 and the peripheral frame 210 are joined and fixed by a fixing portion 400 in the form of hardware (bolts, nuts, etc.). In another example, the fixing portion 400 may be an adhesive or a weld bead left after welding, and the fixing portion 400 is not particularly limited as long as the peripheral frame 210 and the extension unit 300 are joined and fixed. That is, in the battery pack 10, the peripheral frame 210 and the extension unit 300 may be joined by welding, adhesive or hardware fastening.

[0118] Reference Figure 5 The gas G generated in the cell unit 100 moves from point X to point Y through the internal channel 215. The gas G moving from point X moves to point Y through the extension channel 320 of the extension unit 300 connected to the internal channel 215. Figure 5 In the figure, the path of the gas G passing through the extension channel 320 of the extension unit 300 is indicated by a dotted arrow. The extension unit 300 can further extend the path of the gas G and prevent the flame from being exposed to the outside through the above structure.

[0119] The battery pack 10 according to an example of the present application may further include a seal 500. The seal 500 may be located in the area where the extension unit 300 and the frame portion 200 are joined to each other. Specifically, the seal 500 may be located in the area where the extension unit 300 and the peripheral frame 210 or the cross member 220 of the frame portion 200 are joined to each other. In addition, the seal 500 is located in the mutually joined area, so that the gas G passing through the extension channel 320 can be prevented from moving to a path outside the extension channel 320. In addition, the seal 500 can make the extension unit 300 and the frame portion 200 more closely contact and join to each other.

[0120] The seal 500 may include one or more selected from commonly used structural adhesives and liquid (normal temperature reference) gaskets. By using a suitable material as the seal 500, the gas G can be prevented from flowing out from the region where the extension unit 300 and the frame portion 200 are bonded to each other.

[0121] In a battery pack 10 according to an example of the present application, the extension unit 300 may include a material having a melting point of 550°C or more. The melting point of the material may be above 560°C, above 570°C, above 580°C, above 590°C, above 600°C, above 610°C, above 620°C, above 630°C, above 640°C, above 650°C or above 660°C. The higher the melting point of the material, the more advantageous it is, so the upper limit of the melting point of the material is not particularly limited, but the melting point of the material may be below 3000°C, below 2800°C, below 2600°C, below 2400°C, below 2200°C, below 2000°C, below 1800°C or below 1600°C.

[0122] In addition, the extension unit 300 may include a material satisfying the melting point range. In another example, the extension unit 300 may include a plurality of materials satisfying the melting point range. The material satisfying the melting point range may include, for example, one or more selected from aluminum, steel, and ceramics (e.g., mica, etc.).

[0123] The term "melting point" used in this application refers to the temperature at which a solid changes phase to a liquid under normal pressure. If the melting point of a specific object is well known (for example, the melting point shown in non-patent document 1), this value can be used as the melting point used in this application. If the melting point of a specific object is not well known, the melting point of the specific object measured by a capillary method under normal pressure can be used as the melting point used in this application. The capillary method can apply the method according to European Pharmacopoeia 2.2.14 Melting point method-capillary method.

[0124] In a battery pack 10 according to an example of the present application, if the extension unit 300 uses a material having a melting point within the range, it will not melt easily even at a high temperature of a thermal runaway phenomenon, and an extension channel 320 can be continuously provided to discharge the gas G while preventing the flame from being exposed to the outside.

[0125] Figure 6 Shown along Figure 5 The cross section taken along line AA′ in FIG. 1 is a diagram that simply illustrates the peripheral frame 210 and the extension unit 300 of the battery pack 10 according to one example of the present application. Figure 7 Shown with Figure 6 Differently, it is a diagram of a peripheral frame 210 and an extension unit 300 of a battery pack 10 according to an example of the present application.

[0126] The shape of the extension channel 320 of the extension unit 300 is not particularly limited as long as it can extend the exhaust path of the gas G to exhaust the gas G and prevent the flame generated inside from being exposed to the outside.

[0127] Reference Figure 6 , the gas G passing through the internal channel 215 can approach the extension unit 300, and the gas G can flow into the second inlet and outlet channel 332 along the extension channel 320 formed by the partition plate 340 through the first inlet and outlet channel 331 of the extension unit 300. The gas G flowing into the second inlet and outlet channel 332 can enter the internal channel 215 again, and the gas G can be discharged to the outside through the through hole 213. Figure 6 , the partition 340 is arranged to face the extension frame 310, and the moving direction of the gas G changes left and right, thereby extending the moving path.

[0128] Reference Figure 7, the gas G passing through the internal channel 215 can approach the extension unit 300, and the gas G can flow into the second inlet and outlet channel 332 along the extension channel 320 formed by the partition plate 340 through the first inlet and outlet channel 331 of the extension unit 300. The gas G flowing into the second inlet and outlet channel 332 can enter the internal channel 215 again, and the gas G can be discharged to the outside through the through hole 213. Figure 7 The partition 340 is disposed perpendicular to the extension frame 310 , and the moving direction of the gas G is changed by the partition 340 , thereby extending the moving path.

[0129] Figure 8 1 is a diagram simply showing a cross section of a battery pack 10 according to one example of the present application. Fig. 9 1 is a diagram that simply shows a part of a cross section of a battery pack 10 according to one example of the present application.

[0130] Reference Figure 8 , the battery pack 10 according to an example of the present application may experience thermal runaway. Figure 8 In the battery cell unit 100T where thermal runaway occurs, a large amount of gas G, particles and flames are released simultaneously. Here, the gas G and at least a portion of the particles can flow into the internal channel 215 through the above-mentioned exhaust hole 110. The gas G will increase the pressure in the internal channel 215, and when the pressure increases to a level sufficient to be discharged to the outside of the battery pack 10, the gas G can be discharged to the outside through the through hole 213. Before the gas G is discharged to the outside through the through hole 213, it passes through an extension unit 300 having an extension channel 320 connected to the internal channel 215. In addition, both the gas G and the flame will pass through the extension unit 300, and since the extension channel 320 of the extension unit 300 has an extended path, the flame can be prevented from being exposed to the outside. Figure 8 In FIG. 1 , the path of the gas G passing through the extension channel 320 of the extension unit 300 is indicated by a dotted arrow.

[0131] Reference Figure 8 In the battery pack 10 according to an example of the present application, the extension unit 300 may be located in the through hole 213 (H 1 ) and the adjacent discharge hole 110 (H 2 ) between the adjacent discharge holes 110 (H 2 ) is the closest to the through hole 213 along the internal channel 215 (H 1 ) of the discharge hole 110. Since the extension unit 300 is located in the above-mentioned area, even if a thermal runaway phenomenon occurs in the battery cell unit 100 relatively close to the through hole 213, the danger caused by a large amount of gas G can be prevented, and the flame can be prevented from being exposed to the outside.

[0132] Reference Fig. 9 , the battery pack 10 according to an example of the present application may experience thermal runaway. Fig. 9 In the case of thermal runaway, the battery cell unit 100T releases a large amount of gas G, particles and flames at the same time. Here, the gas G can flow into the internal channel 215 through the above-mentioned discharge hole 110. In addition, the gas G can flow into the transverse channel 222 through the above-mentioned discharge hole 223, and the gas G flowing into the transverse channel 222 can flow into the internal channel 215 through the above-mentioned connection hole 224. The gas G can increase the pressure in the internal channel 215, and when the pressure increases to a level sufficient to be discharged to the outside of the battery pack 10, the gas G can be discharged to the outside through the through hole 213. Before the gas G is discharged to the outside through the through hole 213, it passes through an extension unit 300 having an extension channel 320 connected to the internal channel 215. In addition, both the gas G and the flame will pass through the extension unit 300, and since the extension channel 320 of the extension unit 300 has an extended path, the flame can be prevented from being exposed to the outside. In addition, although not shown in the figure, the extension unit 300 can also be formed in the transverse member 220. In Fig. 9 In FIG. 1 , the path of the gas G passing through the extension channel 320 of the extension unit 300 is indicated by a dotted arrow.

[0133] Reference Fig. 9 In the battery pack 10 according to an example of the present application, the extension unit 300 may be located at a position larger than the discharge hole 110 (H 2 ) is closer to the through hole 213 (H 1 ). In addition, in the battery pack 10, the extension unit 300 may be located in a region satisfying the following formula 3.

[0134] [Formula 3]

[0135] L 2 >L 1

[0136] In formula 3, L 1 It refers to the distance between the extension unit 300 and the through hole 213 (H 1 ) between the inner passage 215, L 2 It refers to the distance between the extension unit 300 and the adjacent discharge hole 110 (H 2 ) between the inner passage 215. Fig. 9 , L 1 It can be referred to as the through hole 213 (H 1 ) to assume that from through hole 213 (H 1 ) starts from the distance of the point where the extension unit 300 contacts the extension unit 300 when moving along the internal channel 215. Fig. 9 , L 2It may refer to the distance from the adjacent discharge hole 110 to the distance from the adjacent discharge hole 110 (H 2 ) is the distance from the point where the extension unit 300 contacts the extension unit 300 when moving along the internal channel 215.

[0137] Since the extension unit 300 is located in the region satisfying the above formula 3, even if thermal runaway occurs in the battery cell unit 100 relatively close to the through hole 213, danger caused by a large amount of gas G can be prevented and flame exposure to the outside can be prevented.

[0138] On the other hand, the battery pack 10 according to an example of the present application may include a sealing portion that seals the through hole 213. The sealing portion can usually seal the internal channel 215 so that it is not connected to the outside, but when a large amount of gas G formed by thermal runaway or the like flows into the internal channel 215, the gas G in the internal channel 215 can be discharged to the outside. The sealing portion can be a valve or a plug. That is, the sealing portion can be naturally removed due to the high pressure in the internal channel 215, or the seal can be released by automatic or manual operation, so that the gas G in the internal channel 215 is discharged to the outside.

[0139] An electrical device according to an example of the present application may include one or more battery packs 10 according to an example of the present application. The electrical device is a device that operates by power generated by a battery cell, etc. The electrical device may be, for example, a mobile phone, a home appliance, an electric vehicle, a hybrid vehicle, or an energy storage system (ESS).

Claims

1. A battery pack, characterized in that: include: More than one battery cell unit; A frame portion, comprising a peripheral frame, the peripheral frame surrounding an inner space where the battery cell unit is installed; as well as An extension unit is provided in a part of the frame portion. The peripheral frame includes: a support frame; an internal channel surrounded by the support frame, through which gas can pass; and a through hole connecting the internal channel and the outside of the peripheral frame. The extension unit includes an extension frame and an extension channel, the gas can pass through the extension channel, the extension channel is surrounded by the extension frame and communicates with the internal channel.

2. The battery pack according to claim 1, characterized in that: The battery pack satisfies the following formula 1, [Formula 1] T≤T A In formula 1, T refers to the temperature of the cell unit (T I ) is the temperature measured in the through hole when it is above 200℃, T A It refers to 800°C as a reference temperature, and the unit of the temperature is °C.

3. The battery pack according to claim 2, characterized in that: The temperature of the cell unit (T I ) is above 200°C, The temperature (T) measured in the through hole is proportional to the temperature of the cell unit (T I ) ratio (T / T I ) is in the range of 0.1 to 0.7, and the unit of the temperature is °C.

4. The battery pack according to claim 1, characterized in that: The extension unit is provided in a partial region of the peripheral frame.

5. The battery pack according to claim 1, characterized in that: The extension unit further includes a first access channel and a second access channel, so that the extension channel and the internal channel are connected to each other. The first access channel and the second access channel are opposite to each other, The extension unit satisfies the following formula 2, [Formula 2] L G >L U In formula 2, L U Refers to the straight-line distance between the first access channel and the second access channel, L G Refers to the length of the extended channel.

6. The battery pack according to claim 5, characterized in that: The extension unit comprises one or more partitions, The partition is connected to the extension frame to prevent the passage of gas.

7. The battery pack according to claim 6, characterized in that: The extension unit further includes a plurality of partitions.

8. The battery pack according to claim 1, characterized in that: The extension unit is engaged and fixed to the frame portion.

9. The battery pack according to claim 1, characterized in that: The extension unit includes a material having a melting point of 550° C. or higher.

10. The battery pack according to claim 1, characterized in that: At least a portion of the cell unit body is in contact with the outer frame, and at least a portion of the region in which the cell unit body is in contact with the outer frame includes a discharge hole communicating with the internal channel. The gas generated in the battery cell unit flows into the internal channel through the exhaust hole.

11. The battery pack according to claim 10, characterized in that: The extension unit is located in a region between the through hole (H1) and an adjacent discharge hole (H2), wherein the adjacent discharge hole (H2) is a discharge hole closest to the through hole (H1) along the internal passage.

12. The battery pack according to claim 11, wherein: The extension unit is located in a region satisfying the following formula 3, [Formula 3] L2>L1 In Formula 3, L1 refers to the distance along the internal passage between the extension unit and the through hole (H1), and L2 refers to the distance along the internal passage between the extension unit and the adjacent discharge hole (H2).

13. The battery pack according to claim 1, characterized in that: The frame portion further includes one or more cross members spanning the interior space. At least a portion of the battery cell unit is in contact with the cross member.

14. The battery pack according to claim 13, characterized in that: The cross member is engaged and fixed to the peripheral frame, The transverse member includes: a support member; and a transverse channel surrounded by the support member, through which gas can pass. The battery cell unit includes a discharge hole communicating with the transverse channel in at least a portion of a region where the battery cell unit contacts the transverse member. The gas generated in the battery cell unit flows into the transverse channel through the exhaust hole.

15. The battery pack according to claim 14, characterized in that: The internal passage of the peripheral frame and the transverse passage of the transverse member are in communication with each other.

16. The battery pack according to claim 8, characterized in that: Further including: A sealing member is provided at a region where the extension unit and the frame portion are joined to each other.

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