Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, and relates to the technical field of new energy. The battery pack comprises a battery module, a sub smoke discharge runner, a main smoke discharge runner and a main explosion-proof valve, the battery module comprises a plurality of battery cells arranged in sequence, sub explosion-proof valves are arranged at the tops of the plurality of battery cells, a plurality of penetrable structures are arranged at the bottom of the sub smoke discharge runner, the sub smoke discharge runner is arranged at the top of the battery module, and the main explosion-proof valve is arranged at the bottom of the sub smoke discharge runner. The plurality of penetrable structures on the sub smoke discharge flow channels are respectively butted with the sub anti-explosion valves on the plurality of battery cells, when the battery cells are in thermal runaway, the penetrable structures are used for forming air inlets of the sub smoke discharge flow channels, air outlets of the sub smoke discharge flow channels are communicated with an air inlet of the main smoke discharge flow channel, and an air outlet of the main smoke discharge flow channel is communicated with the main anti-explosion valve; therefore, the sub smoke exhaust flow channels and the main smoke exhaust flow channel jointly form a smoke exhaust channel, and a fire extinguishing medium is arranged in the smoke exhaust channel. The battery pack and the vehicle can improve the safety performance of the energy storage battery.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a battery pack and a vehicle. Background Art

[0002] As the capacity of energy storage batteries continues to increase, the problem of heat diffusion in the field of energy storage batteries has become increasingly prominent. At present, this problem only involves large-surface thermal insulation design, and the heating effect of high-temperature flue gas on adjacent batteries in the ternary system has not been mentioned in energy storage batteries. However, as the capacity of energy storage batteries continues to increase, the problem of high-temperature flue gas in energy storage batteries heating the tops of adjacent batteries has not attracted much attention.

[0003] In addition, most of the current energy storage fire accidents are caused by the electrolyte vapor and combustible gas discharged after the battery thermal runaway, which encounter high-temperature particles, out-of-control battery body, overloaded electrical connections and other components or when the temperature of the battery itself is still high, and are ignited under suitable oxygen concentrations. Therefore, the smoke isolation, cooling, and fire suppression designs of energy storage batteries in the event of thermal runaway of individual batteries also need to be considered simultaneously.

[0004] As mentioned above, the problem of high-temperature flue gas in energy storage batteries heating the tops of adjacent batteries has not yet appeared and has not attracted attention. Therefore, there is no corresponding solution at present. In addition, for the design of smoke isolation, cooling, and fire suppression in the case of thermal runaway of individual batteries of energy storage batteries, fire protection systems are currently usually used to trigger the release of fire extinguishing agents using gas and smoke sensors to achieve remote cooling and fire suppression of relatively high-temperature combustible gas sources in closed cavities. The cooling effect is limited, and the cost of using sensor devices is relatively high. Utility Model Content

[0005] The purpose of the utility model is to provide a battery pack and a vehicle, which can solve the problem of high-temperature flue gas in the energy storage battery heating the top of the adjacent battery and the flue gas isolation, cooling and fire suppression problems of the energy storage battery in the case of thermal runaway of individual batteries, thereby improving the safety performance of the energy storage battery.

[0006] The embodiment of the utility model is achieved as follows:

[0007] According to a first aspect of an embodiment of the utility model, a battery pack is provided, comprising a battery module, a sub-smoke exhaust duct, a main smoke exhaust duct and a main explosion-proof valve, the battery module comprising a plurality of battery cells arranged in sequence, a sub-explosion-proof valve being provided on the top of the plurality of battery cells, a plurality of penetrable structures being provided on the bottom of the sub-smoke exhaust duct, the sub-smoke exhaust duct being provided at the top of the battery module, and the plurality of penetrable structures on the sub-smoke exhaust duct being respectively connected with the sub-explosion-proof valves on the plurality of battery cells, when the battery cell is thermally runaway, the penetrable structure is used to form an air inlet of the sub-smoke exhaust duct, the air outlet of the sub-smoke exhaust duct is connected with the air inlet of the main smoke exhaust duct, the air outlet of the main smoke exhaust duct is connected with the main explosion-proof valve, so that the sub-smoke exhaust duct and the main smoke exhaust duct jointly form a smoke exhaust channel, and a fire extinguishing medium is provided in the smoke exhaust channel. The battery pack can solve the problem of high-temperature flue gas in energy storage batteries heating the tops of adjacent batteries in the prior art and the problems of flue gas isolation, cooling and fire suppression in the event of thermal runaway of individual batteries of energy storage batteries, thereby improving the safety performance of energy storage batteries.

[0008] As an implementable embodiment, the fire extinguishing medium includes a fire extinguishing agent and / or a phase change material, and the evaporation temperature of the phase change material is lower than the temperature of the smoke exhausted through the battery cell when the battery cell has a thermal runaway.

[0009] As an implementation method, the temperature of the smoke exhausted through the battery cell when the battery cell thermally runs away is greater than 300°C.

[0010] As an implementation method, a through hole is provided at the bottom of the sub-smoke exhaust duct, and the through hole is covered with a fireproof and heat-insulating film layer, so that the through hole and the fireproof and heat-insulating film layer together form the penetrable structure.

[0011] As an implementation method, the rated voltage of the battery pack is V, the current of the battery pack 1C rate is I, the total heat of the secondary chemical reaction generated when each battery cell is thermally runaway is Q, and the latent heat of vaporization of the fire extinguishing medium is C. p , the amount of fire extinguishing medium in each of the sub-smoke exhaust channels is m, and satisfies the following relationship:

[0012] As an implementable embodiment, the number of the battery module is at least one, the number of the sub-smoke exhaust duct is at least one, and at least one battery module and at least one sub-smoke exhaust duct are provided correspondingly.

[0013] As an implementable embodiment, the plurality of battery cells are arranged in sequence along a first direction, the sub-smoke exhaust flow channel extends along the first direction, and the main smoke exhaust flow channel extends along a second direction, and the first direction is perpendicular to the second direction.

[0014] As an implementable embodiment, the number of the total smoke exhaust ducts is one or two. When the number of the total smoke exhaust ducts is one, the total smoke exhaust duct is located on the same side of the multiple sub-smoke exhaust ducts. When the number of the total smoke exhaust ducts is two, the two total smoke exhaust ducts are respectively located on opposite sides of the multiple sub-smoke exhaust ducts.

[0015] As an implementation method, it further includes a box body, the battery module, the sub-smoke exhaust duct and the main smoke exhaust duct are all located in the box body, and the main explosion-proof valve is located on the side panel of the box body.

[0016] The second aspect of the embodiment of the utility model provides a vehicle, comprising the above-mentioned battery pack. The battery pack can solve the problem of high-temperature flue gas in the energy storage battery heating the top of the adjacent battery and the problem of flue gas isolation, cooling and fire suppression in the case of thermal runaway of individual batteries of the energy storage battery in the prior art, thereby improving the safety performance of the energy storage battery.

[0017] The beneficial effects of the embodiments of the utility model include:

[0018] The battery pack includes a battery module, a sub-smoke exhaust channel, a main smoke exhaust channel and a main explosion-proof valve. The battery module includes a plurality of battery cells arranged in sequence. Sub-explosion-proof valves are provided on the tops of the plurality of battery cells, and a plurality of penetrable structures are provided on the bottom of the sub-smoke exhaust channel. The sub-smoke exhaust channel is provided at the top of the battery module, and the plurality of penetrable structures on the sub-smoke exhaust channel are respectively connected with the sub-explosion-proof valves on the plurality of battery cells. When the battery cell thermally runs away, the penetrable structure is used to form an air inlet of the sub-smoke exhaust channel, and the air outlet of the sub-smoke exhaust channel is connected with the air inlet of the main smoke exhaust channel, and the air outlet of the main smoke exhaust channel is connected with the main explosion-proof valve, so that the sub-smoke exhaust channel and the main smoke exhaust channel jointly form a smoke exhaust channel, and a fire extinguishing medium is provided in the smoke exhaust channel. In this way, when the battery cell has thermal runaway, the high-temperature flue gas in the battery cell is discharged through the sub-explosion-proof valve along with the high-temperature particles, and penetrates the penetrable structure at the bottom of the sub-smoke exhaust channel to enter the sub-smoke exhaust channel, and then moves to the main smoke exhaust channel, and finally discharged out of the battery pack through the main explosion-proof valve. Compared with the energy storage battery in the prior art that lacks the means to deal with high-temperature flue gas, the battery pack provided by the present application can, under the action of the smoke exhaust channel, transport the high-temperature flue gas discharged when the battery cell has thermal runaway to the main explosion-proof valve and then discharge it out of the battery pack, which can significantly improve the safety performance of the energy storage battery. Compared with the processing means of the energy storage battery in the prior art that triggers the release of the fire extinguishing agent through a sensor, the battery pack provided by the present application can release the fire extinguishing medium stored in the smoke exhaust channel under the condition that the penetrable structure is penetrated by the high-temperature smoke. The triggering method is reliable, the sensor is omitted, and the production and manufacturing cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 One of the structural schematic diagrams of the battery pack provided by the embodiment of the utility model;

[0021] Figure 2 The second structural schematic diagram of the battery pack provided by the embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of the smoke exhaust channel provided in the embodiment of the utility model;

[0023] Figure 4 A schematic structural diagram of a smoke exhaust sub-duct provided in an embodiment of the utility model.

[0024] Icon: 100-battery pack; 10-box; 11-main explosion-proof valve; 20-battery module; 30-smoke exhaust channel; 31-sub-smoke exhaust channel; 311-through hole; 312-fireproof and heat-insulating film layer; 32-main smoke exhaust channel; a-first direction; b-second direction. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Please refer to Figures 1 to 4 The embodiment of the present application provides a battery pack 100, including a battery module 20, a sub-smoke exhaust duct 31, a main smoke exhaust duct 32 and a main explosion-proof valve 11. The battery module 20 includes a plurality of battery cells arranged in sequence, and a sub-explosion-proof valve is provided on the top of each of the plurality of battery cells. A plurality of penetrable structures are provided on the bottom of the sub-smoke exhaust duct 31. The sub-smoke exhaust duct 31 is provided at the top of the battery module 20, and the plurality of penetrable structures on the sub-smoke exhaust duct 31 are respectively connected with the sub-explosion-proof valves on the plurality of battery cells. When the battery cell thermally runs away, the penetrable structure is used to form an air inlet of the sub-smoke exhaust duct 31, and the air outlet of the sub-smoke exhaust duct 31 is connected with the air inlet of the main smoke exhaust duct 32, and the air outlet of the main smoke exhaust duct 32 is connected with the main explosion-proof valve 11, so that the sub-smoke exhaust duct 31 and the main smoke exhaust duct 32 jointly form a smoke exhaust duct 30, and a fire extinguishing medium is provided in the smoke exhaust duct 30. The battery pack 100 can solve the problem of high-temperature flue gas in the energy storage battery heating the top of the adjacent battery in the prior art and the problems of flue gas isolation, cooling and fire suppression in the case of thermal runaway of individual batteries of the energy storage battery, thereby improving the safety performance of the energy storage battery.

[0032] It should be noted that if Figure 1and Figure 2 As shown, the battery pack 100 includes a battery module 20 and a main explosion-proof valve 11. The battery module 20 includes a plurality of battery cells (not shown in the figure) arranged in sequence, so as to form a battery module 20 through series and parallel connection between the plurality of battery cells. Regarding the specific number of battery modules 20, battery cells and the main explosion-proof valve 11, those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific restrictions are made here. Among them, a sub-explosion-proof valve (not shown in the figure) is provided on the top of each battery cell, so that when the battery cell has thermal runaway, the high-temperature flue gas in the battery cell is entrained with high-temperature particles and discharged through the sub-explosion-proof valve, and finally discharged from the battery pack 100 through the main explosion-proof valve 11.

[0033] In order to prevent the high-temperature flue gas discharged from the battery cell with thermal runaway from affecting other battery cells that have not experienced thermal runaway during the period of moving through the sub-explosion-proof valve to the main explosion-proof valve 11, such as Figure 1 and Figure 2 As shown, in the present application, the battery pack 100 also includes a sub-smoke exhaust duct 31 and a main smoke exhaust duct 32. The air outlet of the sub-smoke exhaust duct 31 is connected to the air inlet of the main smoke exhaust duct 32, so that the sub-smoke exhaust duct 31 and the main smoke exhaust duct 32 together form a smoke exhaust channel 30. A plurality of penetrable structures are provided at the bottom of the sub-smoke exhaust duct 31. When the battery cell thermally runs away, the penetrable structure is used to form the air inlet of the sub-smoke exhaust duct 31. The air inlet of the sub-smoke exhaust duct 31 is the air inlet of the smoke exhaust channel 30, and the air outlet of the main smoke exhaust duct 32 is the air outlet of the smoke exhaust channel 30. The air outlet of the main smoke exhaust duct 32 is connected to the main explosion-proof valve 11.

[0034] When the layout design and assembly operation of the battery pack 100 is performed, the multiple battery cells can be arranged in sequence to form a battery module 20, and then the sub-smoke exhaust channel 31 can be set on the top of the battery module 20. When the sub-smoke exhaust channel 31 is fixedly installed, it is necessary to align and connect the multiple penetrable structures at the bottom of the sub-smoke exhaust channel 31 with the sub-explosion-proof valves on the top of the multiple battery cells of the battery module 20, and then connect the air inlet of the main smoke exhaust channel 32 with the air outlet of the sub-smoke exhaust channel 31, and finally connect the main explosion-proof valve 11 with the air outlet of the main smoke exhaust channel 32. Of course, the sub-smoke exhaust channel 31 and the main smoke exhaust channel 32 can also be directly assembled into the smoke exhaust channel 30 as a whole, and then the smoke exhaust channel 30 can be assembled as a whole, and it is still necessary to align and connect the multiple penetrable structures at the bottom of the sub-smoke exhaust channel 31 with the sub-explosion-proof valves on the top of the multiple battery cells of the battery module 20.

[0035] In this way, when the battery cell has thermal runaway, the high-temperature flue gas in the battery cell is discharged through the sub-explosion-proof valve along with the high-temperature particles, and penetrates the penetrable structure at the bottom of the sub-exhaust channel 31 to enter the sub-exhaust channel 31, and then moves to the main exhaust channel 32, and finally discharged from the battery pack 100 through the main explosion-proof valve 11. Compared with the energy storage battery in the prior art that lacks the means for processing high-temperature flue gas, the battery pack 100 provided in the present application can, under the action of the exhaust channel 30, transport the high-temperature flue gas discharged when the battery cell is thermally runaway to the main explosion-proof valve 11 and then discharge it outside the battery pack 100, which can significantly improve the safety performance of the energy storage battery. Compared with the processing means of the energy storage battery in the prior art that triggers the release of the fire extinguishing agent through a sensor, the battery pack 100 provided in the present application can release the fire extinguishing medium stored in the exhaust channel 30 under the condition that the penetrable structure is penetrated by the high-temperature flue gas, and the triggering method is reliable, the sensor is omitted, and the production and manufacturing cost is saved.

[0036] As an implementation method, the fire extinguishing medium includes a fire extinguishing agent and / or a phase change material, and the evaporation temperature of the phase change material is lower than the temperature of the smoke exhausted from the battery cell when the battery cell thermal runaway occurs, so as to ensure that the phase change material can undergo a phase change process from liquid to gas when encountering high-temperature smoke. Optionally, the temperature of the smoke exhausted from the battery cell when the battery cell thermal runaway occurs is greater than 300°C.

[0037] For example, during the manufacturing process, the fire extinguishing medium is a sheet formed by a packaging process (such as hot pressing and sealing). There is no specific restriction on the material of the packaging layer used in the packaging process. It is only necessary to make the packaging layer able to prevent the fire extinguishing agent and phase change material encapsulated therein from leaking under normal working conditions. If the melting point of the packaging layer material is lower than the smoke temperature, after the smoke breaks through the packaging layer, the fire extinguishing agent and the phase change material will directly fall onto the battery cell shell with thermal runaway, and the phase change material will be used to cool the high-temperature coil core. At the same time, the volatile fire extinguishing agent components of the phase change can be mixed into the smoke and discharged out of the battery pack 100, further reducing the probability or severity of open fire when the combustible smoke encounters other fire sources after being discharged; if the melting point of the packaging layer material is higher than the smoke temperature, the evaporation phase change process of the phase change material will absorb the heat of the smoke and break through the packaging layer at the same time. After gasification, the components of the phase change material will also be mixed into the smoke, which can achieve in-situ cooling and fire suppression at the source of the high temperature source.

[0038] As an implementation method, Figure 4 As shown, a through hole 311 is provided at the bottom of the sub-smoke exhaust channel 31, and a fireproof and heat-insulating film layer 312 is covered on the through hole 311, so that the through hole 311 and the fireproof and heat-insulating film layer 312 together form a penetrable structure. The shape of the through hole 311 should be adapted to the shape of the sub-explosion-proof valve on the battery cell.

[0039] As an implementation method, the rated voltage of the battery pack 100 is V, the current of the battery pack 100 is I, the total heat of the secondary chemical reaction generated when each battery cell is thermally runaway is Q, and the latent heat of vaporization of the fire extinguishing medium is C. p , the amount of fire extinguishing medium in each sub-smoke exhaust channel 31 is m, and satisfies the following relationship: Among them, regarding the actual values ​​of each parameter in the above relationship, those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific restrictions are made here.

[0040] As an implementation method, Figure 1 and Figure 2 As shown, the number of battery modules 20 is at least one, the number of sub-smoke exhaust duct 31 is at least one, at least one battery module 20 and at least one sub-smoke exhaust duct 31 are arranged in correspondence, which can be one-to-one correspondence, or multiple battery modules 20 can correspond to one sub-smoke exhaust duct 31, as long as the multiple battery modules 20 are arranged in the extension direction of the sub-smoke exhaust duct 31.

[0041] As an implementation method, Figure 1 and Figure 2 As shown, multiple battery cells are arranged in sequence along a first direction a (i.e., the length direction of the battery pack 100), the sub-smoke exhaust duct 31 extends along the first direction a, and the main smoke exhaust duct 32 extends along the second direction b (i.e., the width direction of the battery pack 100), and the first direction a is perpendicular to the second direction b to ensure that when the battery pack 100 includes multiple battery modules 20 arranged along the width direction of the battery pack 100, the smoke from the multiple sub-smoke exhaust ducts 31 can all be gathered into the main smoke exhaust duct 32.

[0042] As an implementation method, the total number of smoke exhaust channels 32 is one or two. Figures 1 to 3 As shown, in the present embodiment, when the number of the total smoke exhaust duct 32 is one, the total smoke exhaust duct 32 is located on the same side of the plurality of sub-smoke exhaust ducts 31. Of course, in other embodiments, when the number of the total smoke exhaust duct 32 is two, the two total smoke exhaust ducts 32 are respectively located on the opposite sides of the plurality of sub-smoke exhaust ducts 31 to improve the exhaust efficiency of the smoke out of the battery pack 100.

[0043] As an implementation method, Figure 1 and Figure 2 As shown, the battery pack 100 also includes a box body 10, and the battery module 20, the sub-smoke exhaust duct 31 and the main smoke exhaust duct 32 are all located in the box body 10, so that the box body 10 can accommodate and protect the battery module 20, the sub-smoke exhaust duct 31 and the main smoke exhaust duct 32, and the main explosion-proof valve 11 is located on the side panel of the box body 10, so that the box body 10 can be used to install and support the main explosion-proof valve 11.

[0044] The embodiment of the present application further provides a vehicle, comprising the above-mentioned battery pack 100. Since the structure and beneficial effects of the battery pack 100 have been described in detail in the above-mentioned embodiment, they will not be described again here.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: It includes a battery module, a sub-smoke exhaust duct, a main smoke exhaust duct and a main explosion-proof valve. The battery module includes a plurality of battery cells arranged in sequence. A sub-explosion-proof valve is provided on the top of each of the plurality of battery cells. A plurality of penetrable structures are provided on the bottom of the sub-smoke exhaust duct. The sub-smoke exhaust duct is provided at the top of the battery module, and the plurality of penetrable structures on the sub-smoke exhaust duct are respectively connected with the sub-explosion-proof valves on the plurality of battery cells. When the battery cell has thermal runaway, the penetrable structure is used to form an air inlet of the sub-smoke exhaust duct, and the air outlet of the sub-smoke exhaust duct is connected with the air inlet of the main smoke exhaust duct, and the air outlet of the main smoke exhaust duct is connected with the main explosion-proof valve, so that the sub-smoke exhaust duct and the main smoke exhaust duct jointly form a smoke exhaust channel, and a fire extinguishing medium is provided in the smoke exhaust channel.

2. The battery pack according to claim 1, characterized in that: The fire extinguishing medium includes a fire extinguishing agent and / or a phase change material, and the evaporation temperature of the phase change material is lower than the temperature of the smoke exhausted through the battery cell when the battery cell has a thermal runaway.

3. The battery pack according to claim 2, characterized in that: When the battery cell thermally runs away, the temperature of the smoke exhausted from the battery cell is greater than 300°C.

4. The battery pack according to claim 1, characterized in that: A through hole is provided at the bottom of the sub-smoke exhaust flow channel, and the through hole is covered with a fireproof and heat-insulating film layer, so that the through hole and the fireproof and heat-insulating film layer together form the penetrable structure.

5. The battery pack according to claim 1, characterized in that: The rated voltage of the battery pack is V, the current of the battery pack at 1C rate is I, the total heat of the secondary chemical reaction generated when each battery cell is thermally runaway is Q, and the latent heat of vaporization of the fire extinguishing medium is C p , the amount of fire extinguishing medium in each of the sub-smoke exhaust channels is m, and satisfies the following relationship:

6. The battery pack according to claim 1, characterized in that: The number of the battery module is at least one, the number of the sub-smoke exhaust channel is at least one, and at least one battery module and at least one sub-smoke exhaust channel are correspondingly arranged.

7. The battery pack according to claim 6, characterized in that: The plurality of battery cells are arranged in sequence along a first direction, the sub-smoke exhaust flow channel extends along the first direction, the main smoke exhaust flow channel extends along a second direction, and the first direction is perpendicular to the second direction.

8. The battery pack according to claim 6, characterized in that: The number of the total smoke exhaust ducts is one or two. When the number of the total smoke exhaust ducts is one, the total smoke exhaust duct is located on the same side of the multiple sub-smoke exhaust ducts. When the number of the total smoke exhaust ducts is two, the two total smoke exhaust ducts are respectively located on opposite sides of the multiple sub-smoke exhaust ducts.

9. The battery pack according to claim 1, characterized in that: It also includes a box body, the battery module, the sub-smoke exhaust channel and the main smoke exhaust channel are all located in the box body, and the main explosion-proof valve is located on the side panel of the box body.

10. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 9.

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