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 pressing plate and a main explosion-proof valve, the battery module comprises a plurality of battery cells arranged in sequence, each battery cell is provided with a sub explosion-proof valve, a plurality of mutually independent sub smoke discharge flow channels are arranged in the pressing plate, a heat insulation layer is arranged between every two adjacent sub smoke discharge flow channels, a plurality of interfaces are arranged on the pressing plate at intervals, and the main explosion-proof valve is arranged in the main explosion-proof valve. The pressure plate is fixedly arranged at the tops of the plurality of battery cells, the plurality of interfaces on the pressure plate are respectively in butt joint with the plurality of sub anti-explosion valves on the battery cells, so that the sub anti-explosion valves, the interfaces and the sub smoke discharge runners are in one-to-one correspondence and are communicated with one another, a current collecting channel is arranged at the end part of the pressure plate, and the current collecting channel is communicated with the sub anti-explosion valves. And an air outlet of each sub smoke exhaust flow channel is communicated with the main anti-explosion valve through a flow collecting channel. According to the battery pack and the vehicle, the problems of high-temperature flue gas escape and electrolyte splashing under the condition of thermal runaway of the battery cell in the prior art can be solved, so that the safety performance of the battery pack is improved.

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] With the rapid development of the new energy industry, many vehicles or energy storage equipment have begun to use lithium batteries as power to replace traditional fuel systems. However, in actual use, there are concerns about thermal runaway of lithium batteries. In order to address this safety hazard, industry designers have taken fire prevention measures from the battery cell level to the battery box level, with the main purpose of minimizing the impact of thermal runaway.

[0003] When a battery cell experiences thermal runaway, the high-temperature gas generated inside it will leak out through the explosion-proof valve. Along with the escape of the high-temperature gas, some electrolyte will also be brought out. Since the electrolyte is corrosive to a certain extent, it will affect other battery cells that have not experienced thermal runaway. In severe cases, other battery cells may be scrapped together with the battery cell that has experienced thermal runaway, thereby expanding the loss of the accident. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack and a vehicle, which can solve the problems of high-temperature smoke escape and electrolyte splashing when the battery cell has thermal runaway in the prior art, reduce the impact on other battery cells that have not experienced thermal runaway, and thus improve the safety performance of the battery pack.

[0005] The embodiment of the utility model is achieved as follows:

[0006] According to a first aspect of an embodiment of the utility model, a battery pack is provided, comprising a battery module, a pressure plate and a main explosion-proof valve, wherein the battery module comprises a plurality of battery cells arranged in sequence, a sub-explosion-proof valve is arranged on the top of each of the battery cells, a plurality of mutually independent sub-smoke exhaust ducts are arranged inside the pressure plate, a heat insulation layer is arranged between two adjacent sub-smoke exhaust ducts, a plurality of interfaces are arranged at intervals on the bottom of the pressure plate, so as to form air inlets of a plurality of the sub-smoke exhaust ducts respectively through the plurality of interfaces, the pressure plate is fixedly arranged on the tops of the plurality of battery cells, the plurality of interfaces on the pressure plate are respectively connected with the plurality of sub-explosion-proof valves on the battery cells, so that the sub-explosion-proof valves, the interfaces and the sub-smoke exhaust ducts correspond to each other one by one and are connected to each other, a collecting channel is arranged at the end of the pressure plate, the air outlet of each of the sub-smoke exhaust ducts is connected with the air inlet of the collecting channel, and the air outlet of the collecting channel is connected with the main explosion-proof valve. The battery pack can solve the problems of high-temperature smoke escape and electrolyte splashing in the case of thermal runaway of the battery cell in the prior art, reduce the impact on other battery cells that have not experienced thermal runaway, and thus improve the safety performance of the battery pack.

[0007] As an implementable embodiment, the number of the battery module and the number of the pressing plate are both at least one, and the battery module and the pressing plate are arranged in a one-to-one correspondence.

[0008] As an implementable embodiment, when the number of the battery modules and the number of the pressure plates are both multiple, the battery pack also includes a main smoke exhaust duct, the air outlets of the collecting ducts of the multiple pressure plates correspond one-to-one to the multiple air inlets of the main smoke exhaust duct and are interconnected, and the air outlet of the main smoke exhaust duct is connected to the main explosion-proof valve, so that the sub-smoke exhaust duct, the collecting duct and the main smoke exhaust duct together form an exhaust channel for exhausting smoke.

[0009] As an implementable embodiment, an exhaust fan is provided at the air outlet of the main smoke exhaust flow channel, and the exhaust fan is driven to rotate to form a negative pressure in the smoke exhaust channel and drive the smoke in the smoke exhaust channel to be discharged from the air outlet of the main smoke exhaust flow channel.

[0010] As an implementable embodiment, a smoke and temperature detector is provided at the connection between the collecting duct and the main smoke exhaust duct, and the battery pack also includes a controller, which is electrically connected to the smoke and temperature detector and the exhaust fan respectively, and the smoke and temperature detector is used to obtain smoke information and temperature information at the location, and the controller is used to control the operation of the exhaust fan according to the smoke information and temperature information obtained by the smoke and temperature detector.

[0011] As an implementation method, the smoke exhaust channel is filled with a fire extinguishing medium, and 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 thermal runaway occurs in the battery cell.

[0012] As an implementable embodiment, the number of the total smoke exhaust flow channels is one or two. When the number of the total smoke exhaust flow channels is one, the number of the collecting flow channels of each of the pressing plates is one, and the end of each of the pressing plates away from the collecting flow channels is closed. The total smoke exhaust flow channels are located on the same side of the multiple pressing plates. When the number of the total smoke exhaust flow channels is two, the number of the collecting flow channels of each of the pressing plates is two, and the collecting flow channels are provided at opposite ends of each of the pressing plates. The two total smoke exhaust flow channels are located on opposite sides of the multiple pressing plates.

[0013] As an implementable embodiment, a seal is disposed around the outer edge of the interface, and the seal is clamped between the bottom of the pressure plate and the top of the battery cell.

[0014] As an implementation method, it also includes a box body, the battery module and the pressure plate are both located in the box body, and the main explosion-proof valve is located on the side plate of the box body.

[0015] 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 problems of high-temperature smoke escape and electrolyte splashing when the battery cell has thermal runaway in the prior art, reduce the impact on other battery cells that have not experienced thermal runaway, and thus improve the safety performance of the battery pack.

[0016] The beneficial effects of the embodiments of the utility model include:

[0017] The battery pack includes a battery module, a pressure plate and a main explosion-proof valve. The battery module includes a plurality of battery cells arranged in sequence, a sub-explosion-proof valve is arranged on the top of each battery cell, a plurality of independent sub-smoke exhaust ducts are arranged inside the pressure plate, a heat insulation layer is arranged between two adjacent sub-smoke exhaust ducts, a plurality of interfaces are arranged at intervals on the bottom of the pressure plate to form air inlets of a plurality of sub-smoke exhaust ducts through the plurality of interfaces, the pressure plate is fixedly arranged on the tops of the plurality of battery cells, the plurality of interfaces on the pressure plate are respectively connected with the plurality of sub-explosion-proof valves on the battery cells, so that the sub-explosion-proof valves, interfaces and sub-smoke exhaust ducts correspond to each other one by one and are connected with each other, a collecting channel is arranged at the end of the pressure plate, the air outlet of each sub-smoke exhaust duct is connected with the air inlet of the collecting channel, and the air outlet of the collecting channel is connected with the main explosion-proof valve. In this way, when a battery cell experiences thermal runaway, the high-temperature flue gas and electrolyte in the battery cell are discharged through the sub-explosion-proof valve, and flow into the sub-smoke exhaust channel through the interface (i.e., the air inlet of the sub-smoke exhaust channel), and then flow into the collecting channel through the air outlet of the sub-smoke exhaust channel and the air inlet of the collecting channel in turn, and finally discharged out of the battery pack through the air outlet of the collecting channel and the main explosion-proof valve in turn. Since the multiple sub-smoke exhaust channels are independent of each other, and a heat insulation layer is provided between two adjacent sub-smoke exhaust channels, the multiple sub-smoke exhaust channels can be isolated from each other, thereby avoiding mutual influence between the multiple sub-smoke exhaust channels. Even if high-temperature flue gas and electrolyte are flowing through a sub-smoke exhaust channel, they will not penetrate the heat insulation layer and flow into other sub-smoke exhaust channels, thereby reducing the impact on other battery cells that have not experienced thermal runaway, thereby improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 One of the structural schematic diagrams of the battery pack provided in the embodiment of the utility model;

[0020] Figure 2 The second structural schematic diagram of the battery pack provided by the embodiment of the utility model;

[0021] Figure 3 One of the structural schematic diagrams of the smoke exhaust channel provided in the embodiment of the utility model;

[0022] Figure 4 The second structural schematic diagram of the smoke exhaust channel provided by the embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the structure of a pressing plate provided in an embodiment of the utility model;

[0024] Figure 6 A schematic diagram of an electric control provided for an embodiment of the utility model.

[0025] Icons: 100-battery pack; 10-battery module; 11-battery cell; 20-pressure plate; 21-sub-smoke exhaust duct; 22-interface; 23-collector duct; 30-main explosion-proof valve; 40-main smoke exhaust duct; 50-exhaust fan; 60-smoke and temperature detector; 70-controller; 80-seal; 90-box. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please refer to Figures 1 to 6 The present application embodiment provides a battery pack 100, including a battery module 10, a pressure plate 20 and a main explosion-proof valve 30. The battery module 10 includes a plurality of battery cells 11 arranged in sequence, each battery cell 11 is provided with a sub-explosion-proof valve on the top, a plurality of mutually independent sub-smoke exhaust channels 21 are provided inside the pressure plate 20, a heat insulation layer is provided between two adjacent sub-smoke exhaust channels 21, and a plurality of interfaces 22 are provided at intervals at the bottom of the pressure plate 20 to form respectively through the plurality of interfaces 22 The pressure plate 20 is fixedly arranged on the top of the multiple battery cells 11, and the multiple interfaces 22 on the pressure plate 20 are respectively connected with the multiple sub-explosion-proof valves on the battery cells 11, so that the sub-explosion-proof valves, interfaces 22 and sub-exhaust flow channels 21 correspond to each other and are interconnected. The end of the pressure plate 20 is provided with a collecting channel 23, and the air outlet of each sub-exhaust flow channel 21 is connected to the air inlet of the collecting channel 23, and the air outlet of the collecting channel 23 is connected to the main explosion-proof valve 30. The battery pack 100 can solve the problems of high-temperature smoke escape and electrolyte splashing in the case of thermal runaway of the battery cell 11 in the prior art, reduce the impact on other battery cells 11 that have not experienced thermal runaway, and thus improve the safety performance of the battery pack 100.

[0033] It should be noted that if Figure 1 and Figure 2 As shown, the battery pack 100 includes a battery module 10, a pressure plate 20 and a main explosion-proof valve 30, wherein the battery module 10 includes a plurality of battery cells 11 arranged in sequence, so as to form the battery module 10 through the series-parallel connection between the plurality of battery cells 11, and a sub-explosion-proof valve (not shown in the figure) is provided on the top of each battery cell 11, so that when the battery cell 11 has thermal runaway, the high-temperature flue gas and electrolyte in the battery cell 11 are discharged through the sub-explosion-proof valve, and finally discharged out of the battery pack 100 through the main explosion-proof valve 30. Regarding the implementation of the series-parallel connection between the plurality of battery cells 11, the electrical connection between two adjacent battery cells 11 can be realized by a bar sheet, etc., and 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.

[0034] In order to prevent the high-temperature flue gas and electrolyte discharged from the battery cell 11 that has thermal runaway from affecting other battery cells 11 that have not thermal runaway during the process of moving through the sub-explosion-proof valve to the main explosion-proof valve 30, such as Figures 3 to 5 As shown, a plurality of independent sub-smoke exhaust channels 21 are arranged inside the pressing plate 20 to avoid mutual influence between the plurality of sub-smoke exhaust channels 21, and a heat insulation layer (not shown in the figure) is arranged between two adjacent sub-smoke exhaust channels 21 to isolate the two adjacent sub-smoke exhaust channels 21 through the heat insulation layer, thereby further avoiding mutual influence between the plurality of sub-smoke exhaust channels 21. In this way, even if high-temperature flue gas and electrolyte are flowing through a sub-smoke exhaust channel 21, they will not penetrate the heat insulation layer and flow into other sub-smoke exhaust channels 21.

[0035] On this basis, if Figures 3 to 5 As shown, the bottom of the pressing plate 20 is provided with multiple interfaces 22 at intervals, so as to form the air inlets of multiple sub-smoke exhaust channels 21 through the multiple interfaces 22, and the pressing plate 20 is fixedly arranged on the top of multiple battery cells 11, and the multiple interfaces 22 on the pressing plate 20 are respectively connected with the multiple sub-explosion-proof valves on the battery cells 11, so that the sub-explosion-proof valves, interfaces 22 and sub-smoke exhaust channels 21 correspond to each other and are interconnected, and the end of the pressing plate 20 is provided with a collecting channel 23, and the air outlet of each sub-smoke exhaust channel 21 is connected with the air inlet of the collecting channel 23, and the air outlet of the collecting channel 23 is connected with the main explosion-proof valve 30. Among them, the shape of the interface 22 should match the shape of the sub-explosion-proof valve. For example, in this embodiment, the shape of the interface 22 and the sub-explosion-proof valve are both waist-shaped. Furthermore, the interface 22 may be covered with a fireproof and heat-insulating film. When thermal runaway occurs in the battery cell 11 , the fireproof and heat-insulating film may be penetrated by the high-temperature smoke, thereby enabling the sub-explosion-proof valve and the interface 22 to be connected.

[0036] For example, Figures 1 to 4As shown, in this embodiment, the shape of the pressing plate 20 is a "J" shape, so as to cooperate with the box body 90 of the battery pack 100 to constrain the multiple battery cells 11 in the vertical direction to prevent the battery cells 11 from jumping. In addition, the battery module 10 also includes two end plates and a restraining member, the two end plates are respectively arranged at the opposite ends of the multiple battery cells 11, and the inner side surfaces of the two end plates are respectively arranged to fit the two end surfaces located at the opposite ends of the multiple battery cells 11, so as to restrain the multiple battery cells 11 in the arrangement direction of the battery cells 11 through the two end plates, and the opposite ends of the pressing plate 20 can be fixed to the two end plates by fasteners, so that the pressing plate 20, the multiple battery cells 11 and the two end plates form a module as a whole; the restraining member is arranged around the peripheral side surface of the multiple battery cells 11 and the two end plates to form a module as a whole, so as to constrain the module as a whole formed by the multiple battery cells 11 and the two end plates in the circumferential direction through the restraining member. Among them, the restraining member can be an elastic band, a plastic steel band, etc., which is not specifically limited here. For example, in this embodiment, there are two restraining members, which are arranged at intervals in the vertical direction, one of which is close to the top surface of the battery cell 11, and the other is close to the bottom surface of the battery cell 11, so as to further improve the restraining effect.

[0037] In the actual assembly process, multiple battery cells 11 can be arranged in sequence to form a battery module 10, and then the pressing plate 20 can be fixedly set on the top of the battery module 10. When positioning and installing the pressing plate 20, it should be noted that the multiple interfaces 22 at the bottom of the pressing plate 20 are aligned and connected with the sub-explosion-proof valves on the top of the multiple battery cells 11, and then the collector 23 at the end of the pressing plate 20 is aligned and connected with the main explosion-proof valve 30. In this way, when the battery cell 11 has thermal runaway, the high-temperature flue gas and electrolyte in the battery cell 11 are discharged through the sub-explosion-proof valve, and flow into the sub-exhaust flow channel 21 through the interface 22 (i.e., the air inlet of the sub-exhaust flow channel 21), and then flow into the collector 23 through the air outlet of the sub-exhaust flow channel 21 and the air inlet of the collector 23 in turn, and finally discharged from the battery pack 100 through the air outlet of the collector 23 and the main explosion-proof valve 30 in turn. Since the multiple sub-smoke exhaust ducts 21 are independent of each other and an insulation layer is arranged between two adjacent sub-smoke exhaust ducts 21, the multiple sub-smoke exhaust ducts 21 can be isolated from each other, thereby avoiding mutual influence between the multiple sub-smoke exhaust ducts 21. Even if high-temperature flue gas and electrolyte are flowing through a sub-smoke exhaust duct 21, they will not penetrate the insulation layer and flow into other sub-smoke exhaust ducts 21, thereby reducing the impact on other battery cells 11 that have not experienced thermal runaway, thereby improving the safety performance of the battery pack 100.

[0038] As an implementation method, Figure 1 and Figure 2As shown, the number of battery modules 10 and the number of pressing plates 20 are both at least one, and the battery modules 10 and the pressing plates 20 are arranged one by one. For example, in this embodiment, the number of battery modules 10 and the number of pressing plates 20 are both two, and the two battery modules 10 and the two pressing plates 20 are arranged one by one.

[0039] As an implementation method, Figures 2 to 4 As shown, when the number of battery modules 10 and pressure plates 20 is multiple (for example, two in the figure), the battery pack 100 also includes a total smoke exhaust channel 40, and the air outlets of the collector channels 23 of the multiple pressure plates 20 correspond to the multiple air inlets of the total smoke exhaust channel 40 one by one and are interconnected, and the air outlet of the total smoke exhaust channel 40 is connected to the main explosion-proof valve 30, so that the sub-smoke exhaust channel 21, the collector channel 23 and the total smoke exhaust channel 40 together form a smoke exhaust channel for exhausting smoke. Among them, a quick-connect connector can be provided on the air outlet of the total smoke exhaust channel 40 to facilitate the installation of the air outlet of the total smoke exhaust channel 40 on the main explosion-proof valve 30.

[0040] As an implementation method, Figure 6 As shown, an exhaust fan 50 is provided at the air outlet of the main smoke exhaust channel 40. The exhaust fan 50 is driven to rotate to form a negative pressure in the smoke exhaust channel. Under the action of the negative pressure, the smoke in the smoke exhaust channel is driven to be discharged from the air outlet of the main smoke exhaust channel 40 to the outside of the battery pack 100 along with the electrolyte, thereby reducing the gas pressure in the smoke exhaust channel and achieving the purpose of smoke exhaust.

[0041] In order to improve the intelligence of smoke exhaust operation, as an implementable method, Figure 6 As shown, a smoke and temperature detector 60 is provided at the connection between the collecting channel 23 and the main exhaust channel 40, and the battery pack 100 further includes a controller 70, which is electrically connected to the smoke and temperature detector 60 and the exhaust fan 50 respectively. The smoke and temperature detector 60 is used to obtain smoke information and temperature information at the location, and the controller 70 is used to control the operation of the exhaust fan 50 according to the smoke information and temperature information obtained by the smoke and temperature detector 60. Among them, the controller 70 can be preset with a smoke threshold and a temperature threshold, and as long as one of the smoke information and temperature information obtained in real time by the smoke and temperature detector 60 exceeds the preset safety threshold, the fan can be controlled to rotate to exhaust the smoke in the exhaust channel.

[0042] As an implementation method, the smoke exhaust channel is filled with a fire extinguishing medium (not shown in the figure), which 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 11 when the battery cell 11 experiences thermal runaway. When the battery cell 11 experiences thermal runaway, the fire extinguishing agent and the phase change material in the smoke exhaust channel will fall on the battery cell 11 experiencing thermal runaway, and the phase change material will be used to cool the high-temperature battery cell 11. At the same time, the fire extinguishing agent component can be mixed with the smoke and exhausted from the battery pack 100, further reducing the probability or severity of open fire when the combustible smoke encounters other fire sources after being exhausted.

[0043] As an implementation method, the total number of smoke exhaust channels 40 is one or two. Figures 1 to 4 As shown, in the present embodiment, when the number of total smoke exhaust ducts 40 is one, the number of collecting ducts 23 of each pressing plate 20 is one, the end of each pressing plate 20 away from the collecting duct 23 is closed, and the total smoke exhaust duct 40 is located on the same side of the plurality of pressing plates 20; of course, in other embodiments, when the number of total smoke exhaust ducts 40 is two, the number of collecting ducts 23 of each pressing plate 20 is two, each pressing plate 20 is provided with collecting ducts 23 at both opposite ends, and the two total smoke exhaust ducts 40 are located on opposite sides of the plurality of pressing plates 20 to improve the exhaust efficiency of smoke.

[0044] As an implementation method, Figure 5 As shown, a seal 80 is disposed around the outer edge of the interface 22, and the seal 80 is clamped between the bottom of the pressure plate 20 and the top of the battery cell 11 to improve the sealing between the pressure plate 20 and the battery cell 11. For example, the seal 80 is an annular sealing ring, and the shape of the sealing ring matches the shape of the interface 22.

[0045] As an implementation method, Figure 1 and Figure 2 As shown, the battery pack 100 also includes a box body 90, and the battery module 10 and the pressure plate 20 are both located in the box body 90, so that the box body 90 protects the battery module 10 and the pressure plate 20, and the main explosion-proof valve 30 is located on the side panel of the box body 90, so that the box body 90 supports the main explosion-proof valve 30.

[0046] 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.

[0047] 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 pressure plate and a main explosion-proof valve, the battery module includes a plurality of battery cells arranged in sequence, a sub-explosion-proof valve is arranged on the top of each of the battery cells, a plurality of independent sub-smoke exhaust ducts are arranged inside the pressure plate, a heat insulation layer is arranged between two adjacent sub-smoke exhaust ducts, a plurality of interfaces are arranged at intervals on the bottom of the pressure plate to form air inlets of a plurality of the sub-smoke exhaust ducts respectively through the plurality of interfaces, the pressure plate is fixedly arranged on the tops of the plurality of battery cells, the plurality of interfaces on the pressure plate are respectively connected with the plurality of sub-explosion-proof valves on the battery cells, so that the sub-explosion-proof valves, the interfaces and the sub-smoke exhaust ducts correspond to each other one by one and are connected to each other, a collecting channel is arranged at the end of the pressure plate, the air outlet of each of the sub-smoke exhaust ducts is connected with the air inlet of the collecting channel, and the air outlet of the collecting channel is connected with the main explosion-proof valve.

2. The battery pack according to claim 1, characterized in that: The number of the battery module and the number of the pressing plate are both at least one, and the battery modules and the pressing plates are arranged in a one-to-one correspondence.

3. The battery pack according to claim 2, characterized in that: When there are multiple battery modules and multiple pressure plates, the battery pack also includes a main smoke exhaust duct, the air outlets of the collecting ducts of the multiple pressure plates correspond one-to-one to the multiple air inlets of the main smoke exhaust duct and are interconnected, and the air outlet of the main smoke exhaust duct is connected to the main explosion-proof valve, so that the sub-smoke exhaust duct, the collecting duct and the main smoke exhaust duct together form an exhaust channel for exhausting smoke.

4. The battery pack according to claim 3, characterized in that: An exhaust fan is arranged at the air outlet of the main smoke exhaust flow channel, and the exhaust fan is driven to rotate to form a negative pressure in the smoke exhaust channel and drive the smoke in the smoke exhaust channel to be discharged from the air outlet of the main smoke exhaust flow channel.

5. The battery pack according to claim 4, characterized in that: A smoke and temperature detector is provided at the connection between the collecting channel and the main smoke exhaust channel. The battery pack also includes a controller, which is electrically connected to the smoke and temperature detector and the exhaust fan respectively. The smoke and temperature detector is used to obtain smoke information and temperature information at the location, and the controller is used to control the operation of the exhaust fan according to the smoke information and temperature information obtained by the smoke and temperature detector.

6. The battery pack according to claim 3, characterized in that: The smoke exhaust channel is filled with a fire extinguishing medium, which 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 thermal runaway occurs in the battery cell.

7. The battery pack according to claim 3, characterized in that: The number of the total smoke exhaust flow channels is one or two. When the number of the total smoke exhaust flow channels is one, the number of the collecting flow channels of each of the pressing plates is one, and the end of each of the pressing plates away from the collecting flow channels is closed. The total smoke exhaust flow channels are located on the same side of the multiple pressing plates. When the number of the total smoke exhaust flow channels is two, the number of the collecting flow channels of each of the pressing plates is two, and the collecting flow channels are provided at opposite ends of each of the pressing plates. The two total smoke exhaust flow channels are located on opposite sides of the multiple pressing plates.

8. The battery pack according to claim 1, characterized in that: A sealing member is arranged around the outer edge of the interface, and the sealing member is clamped between the bottom of the pressing plate and the top of the battery core.

9. The battery pack according to claim 1, characterized in that: It also includes a box body, the battery module and the pressure plate are both located in the box body, and the main explosion-proof valve is located on the side plate 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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