Battery pack, power assembly and electric equipment

Abstract

The utility model discloses a battery pack, a power assembly and electric equipment, relates to the technical field of new energy, and aims to solve the problem that other battery cell modules are induced to be subjected to thermal runaway due to the fact that smoke released by thermal runaway can flow back to a battery cell module area which is not subjected to thermal runaway due to the structure of an existing battery. The battery pack comprises a shell, a battery cell module and an anti-explosion valve, a plurality of accommodating cavities arranged at intervals and a plurality of exhaust channels arranged at intervals are formed in the shell, and different accommodating cavities are communicated with different exhaust channels; at least one battery cell module is accommodated in one accommodating cavity, and the plurality of exhaust channels are blocked by the explosion-proof valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially relates to a battery pack, power assembly and electric equipment. BACKGROUND

[0002] With the rise and popularization of new energy vehicles, and with the increasingly serious global energy crisis and environmental pollution problems, the development of electric vehicles is particularly rapid. Electric vehicles use electricity as a power source and replace oil-fired engines with electric motors, which not only have the characteristics of high efficiency, low noise and reduced exhaust emissions, but also can greatly save fuel energy.

[0003] As the core power element of an electric vehicle, the structural safety of a battery is an important factor affecting the safety factor of the vehicle. When the battery experiences thermal runaway, the battery cell module will generate and release a large amount of smoke and electrolyte vapor. The existing solution is to set a smoke exhaust channel inside the battery and then discharge the battery through an explosion-proof valve. However, the existing structure can cause the smoke released during thermal runaway to flow back to the battery cell module area that has not experienced thermal runaway, inducing thermal runaway in other battery cell modules and causing greater losses. SUMMARY

[0004] The utility model aims at providing a battery pack, power assembly and electric equipment, and aims to solve the problem that the structure of the existing battery can cause the smoke released during thermal runaway to flow back to the battery cell module area that has not experienced thermal runaway, inducing thermal runaway in other battery cell modules.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] The utility model provides a battery pack, which comprises a shell, a battery cell module and an explosion-proof valve, a plurality of spaced accommodating cavities and a plurality of spaced exhaust channels are formed in the shell, and different accommodating cavities are communicated with different exhaust channels; at least one battery cell module is arranged in one accommodating cavity, and the explosion-proof valve blocks the plurality of exhaust channels.

[0007] According to the battery pack, the plurality of accommodating cavities are arranged in the shell, the battery cell module is arranged in the accommodating cavity, and different accommodating cavities are communicated with different exhaust channels. When the battery cell module in one of the accommodating cavities experiences thermal runaway, the smoke and electrolyte vapor generated during thermal runaway can be discharged from the accommodating cavity through the separate exhaust channel and then discharged from the shell through the explosion-proof valve communicated with the exhaust channel, so that the smoke and electrolyte vapor can be prevented from flowing back to the accommodating cavity that has not experienced thermal runaway, the safety of the other accommodating cavities is ensured, and more serious thermal runaway of the battery pack is avoided.

[0008] In some embodiments of the present application, the plurality of accommodating cavities are arranged along a first direction, the first direction being perpendicular to a thickness direction of the shell; the plurality of exhaust channels include a first group of exhaust channels and a second group of exhaust channels, the first group of exhaust channels being arranged on one side of the shell along a second direction, the second group of exhaust channels being arranged on the other side of the shell along the second direction, the second direction being perpendicular to the first direction and perpendicular to the thickness direction of the shell.

[0009] In this way, arranging the plurality of accommodating cavities along the first direction and arranging the first group of exhaust channels and the second group of exhaust channels on the two sides of the shell along the second direction, and the second direction being perpendicular to the first direction, can avoid the different exhaust channels from crossing each other, improve the exhaust efficiency of the exhaust channels, and the second direction being perpendicular to the thickness direction of the shell can reduce the overall thickness of the battery pack and facilitate the assembly of the battery pack.

[0010] In some embodiments of the present application, different exhaust channels in the first group of exhaust channels are respectively in communication with the plurality of accommodating cavities; and / or, different exhaust channels in the second group of exhaust channels are respectively in communication with the plurality of accommodating cavities.

[0011] In this way, one accommodating cavity can be connected to one or more exhaust channels, and when the battery cell module in the accommodating cavity experiences thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged from the accommodating cavity through different exhaust channels, avoiding the smoke and electrolyte vapor from staying in the accommodating cavity for a long time and causing more serious thermal runaway, thereby improving the safety of the battery pack.

[0012] In some embodiments of the present application, the exhaust channels in the first group of exhaust channels are arranged along the thickness direction of the shell; and / or, the exhaust channels in the second group of exhaust channels are arranged along the thickness direction of the shell.

[0013] In this way, the size of the first group of exhaust channels and / or the second group of exhaust channels in the second direction can be reduced, thereby reducing the size of the battery pack in the second direction, avoiding the inconvenience of installing the battery pack due to the excessively large size of the battery pack, and improving the convenience of installing the battery pack.

[0014] In some embodiments of the present application, the shell further comprises a converging cavity and a first opening, the first opening being in communication with the converging cavity and an external space, the plurality of exhaust channels are in communication with the converging cavity, and the explosion-proof valve is arranged at the first opening.

[0015] In this way, when the battery cell module in one of the accommodating cavities experiences thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged to the converging cavity through the exhaust channels, and then discharged from the shell through the explosion-proof valve of the first opening, so that one explosion-proof valve can be used to prevent and control the entire battery pack, thereby reducing the production cost of the battery pack, and the number of openings arranged on the shell can be reduced, thereby avoiding the excessive openings affecting the strength of the shell and improving the strength of the shell of the battery pack.

[0016] In some embodiments of the present application, the battery pack further comprises a plurality of check valves, one check valve is connected between one exhaust channel and one containing cavity, the check valve is used to disconnect the containing cavity and the exhaust channel, and when the gas pressure in the containing cavity is greater than a preset pressure, the check valve is opened to make the gas in the containing cavity flow to the exhaust channel.

[0017] In this way, during normal operation of the battery pack, the check valve is used to disconnect the containing cavity and the exhaust channel, so as to avoid foreign matter from entering the containing cavity and affecting the normal operation of the battery cell module, when thermal runaway occurs in one battery cell module in one containing cavity, the smoke and electrolyte vapor generated by the thermal runaway will increase the gas pressure in the containing cavity, when the gas pressure in the containing cavity is greater than the preset pressure, the check valve is opened to make the gas in the containing cavity flow to the exhaust channel until it is discharged from the shell, and other check valves can also prevent the smoke and electrolyte vapor generated by the thermal runaway from entering the containing cavity that does not occur thermal runaway, thereby ensuring the safety of the containing cavity that does not occur thermal runaway and improving the safety of the battery pack.

[0018] In some embodiments of the present application, the check valve comprises a connecting part and a check part, the connecting part is connected with the shell, and the connecting part is provided with a first air hole, the first air hole is in communication with the containing cavity; the check part is connected with the connecting part and located in the exhaust channel, the check part is used to block the first air hole, and when the gas pressure in the containing cavity is greater than the preset pressure, the check part can connect the containing cavity and the exhaust channel.

[0019] In this way, the connecting part can be connected with the shell, and the first air hole is connected with the containing cavity, the check part can block the first air hole to avoid foreign matter from entering the containing cavity, when the gas pressure in the containing cavity is greater than the preset pressure, the check part can connect the containing cavity and the exhaust channel to make the smoke and electrolyte vapor generated by the thermal runaway flow out of the containing cavity, thereby improving the safety of the battery pack.

[0020] In some embodiments of the present application, the check part comprises an elastic shell, the elastic shell is provided with an inner cavity in communication with the first air hole; the elastic shell further comprises a first side wall and a second side wall which are oppositely arranged along the radial direction of the exhaust channel, the check part has a closed state and an open state, when the check part is in the closed state, one end of the first side wall away from the connecting part is attached to one end of the second side wall away from the connecting part to block the first air hole; when the check part is in the open state, one end of the first side wall away from the connecting part is separated from one end of the second side wall away from the connecting part to connect the containing cavity and the exhaust channel.

[0021] In this way, when the battery cell module is in normal operation, the reverse stopping portion is in the closed state, the one end of the first side wall away from the connecting portion is attached to the one end of the second side wall away from the connecting portion, so as to block the first air hole; when the battery cell module is in thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway increase the gas pressure in the containing cavity, when the gas pressure in the containing cavity is greater than the preset pressure, the elastic shell is elastically deformed, the reverse stopping portion is in the open state, the one end of the first side wall away from the connecting portion is separated from the one end of the second side wall away from the connecting portion, so as to connect the containing cavity and the exhaust passage, so that the reverse stopping valve can prevent and control the thermal runaway according to the change of the gas pressure in the containing cavity, without the need to set other monitoring devices in the containing cavity to detect whether the battery cell module is in thermal runaway, thereby reducing the production cost of the battery pack.

[0022] In some embodiments of the present application, two elastic side walls are further included, the first side wall and the second side wall are connected between the two elastic side walls; in the process of switching the reverse stopping portion from the closed state to the open state, the two elastic side walls are elastically deformed, so that the one end of the first side wall away from the connecting portion is separated from the one end of the second side wall away from the connecting portion.

[0023] In this way, in the process of switching the reverse stopping portion from the closed state to the open state, the two elastic side walls are elastically deformed, so that the one end of the first side wall away from the connecting portion is separated from the one end of the second side wall away from the connecting portion, so as to connect the containing cavity and the exhaust passage, so that the smoke and electrolyte vapor in the containing cavity are discharged to the exhaust passage through the gap between the one end of the first side wall away from the connecting portion and the one end of the second side wall away from the connecting portion, avoiding the smoke and electrolyte vapor escaping to affect the normal operation of other components of the battery pack.

[0024] In some embodiments of the present application, the inner wall surface of the containing cavity is provided with a plurality of second openings communicated with the exhaust passage, and one reverse stopping valve is arranged at one second opening.

[0025] In this way, one containing cavity can be provided with a plurality of second openings communicated with the exhaust passage, and a reverse stopping valve is arranged at each second opening, when the battery cell module in the containing cavity is in thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged from the containing cavity through different reverse stopping valves, not only can improve the exhaust efficiency of the containing cavity, avoid the smoke and electrolyte vapor staying in the containing cavity for a long time to cause more serious thermal runaway, but also can improve the safety of the battery pack when one reverse stopping valve fails.

[0026] In some embodiments of the present application, the battery pack further comprises a plurality of interval arranged explosion-proof valves; a plurality of first openings are further arranged in the shell, the plurality of first openings are communicated with the current collecting cavity and the external space; one explosion-proof valve is arranged at one first opening.

[0027] In this way, the shell can be provided with a plurality of first openings in communication with the external space, and the explosion-proof valve is arranged at the first opening, when the battery cell module in the containing cavity occurs thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged from the shell through different explosion-proof valves, improving the exhaust efficiency of the shell, avoiding the smoke and electrolyte vapor in the shell for a long time, causing more serious thermal runaway, when one of the explosion-proof valves fails, the other explosion-proof valves can still discharge the gas from the shell, improving the safety of the battery pack.

[0028] The application also provides a power assembly comprising the battery pack.

[0029] The application also provides a power consumption device comprising the battery pack or the power assembly. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The application provides a structural schematic diagram of a power consumption device;

[0032] Figure 2 The application provides a structural schematic diagram of a battery pack;

[0033] Figure 3 The application provides a structural schematic diagram of an exhaust passage;

[0034] Figure 4 The application provides a top view of a battery pack;

[0035] Figure 5 The application provides an installation schematic diagram of a check valve;

[0036] Figure 6 The application provides a schematic diagram of an open state of a check valve;

[0037] Figure 7 The application provides a schematic diagram of a closed state of a check valve.

[0038] 1000, electric device; 100, battery pack; 10, shell; 11, accommodating cavity; 13, exhaust passage; 20, battery cell module; 30, explosion-proof valve; 131, first group of exhaust passages; 132, second group of exhaust passages; 14, converging cavity; 12, first opening; 40, check valve; 41, connecting portion; 42, check portion; 43, elastic shell; 431, first side wall; 432, second side wall; 433, elastic side wall; 111, second opening. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above directional description can be flexibly arranged in the actual application process under the condition of meeting the relative positional relationship shown in the drawings.

[0041] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0042] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "communicating" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be directly connected, or indirectly connected through an intermediate medium. It can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the embodiments of the present application, the terms "comprising", "containing" or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, article or apparatus that comprises a list of elements not only includes those elements, but also includes other elements that are not expressly listed, or further includes elements inherent in such process, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, article or apparatus comprising the element.

[0044] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example or illustration.

[0045] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0046] With the rise and popularity of new energy vehicles, and with the increasingly serious global energy crisis and environmental pollution problems, the development of electric vehicles is particularly rapid. Electric vehicles use electricity as a power source, replacing oil-fired engines with electric motors, not only have the characteristics of high efficiency, low noise, and reduced exhaust emissions, but also can greatly save fuel energy.

[0047] As the core power element of electric vehicles, the structural safety of the battery is an important factor affecting the safety factor of the whole vehicle. When the battery is in thermal runaway, the battery cell module will generate and release a large amount of smoke and electrolyte vapor. The existing solution is to set a smoke exhaust channel in the battery, and then discharge the battery through the explosion-proof valve, but the existing structure will cause the smoke released by thermal runaway to backflow to the area of the battery cell module that has not occurred thermal runaway, inducing other battery cell modules to occur thermal runaway, causing greater losses.

[0048] As shown in Figure 1 The present application provides a kind of electric equipment 1000, such as vehicle or aircraft etc., for the convenience of the present application is described below with vehicle as example.

[0049] Wherein, the vehicle can be new energy vehicle or hybrid vehicle, the present application is not limited to this.

[0050] The vehicle can include a vehicle body and a powertrain. The vehicle body includes a vehicle body shell, a passenger compartment and a chassis, and other parts. The vehicle body material is usually made of lightweight metal or high-strength plastic to reduce the overall weight of the vehicle and improve energy efficiency.

[0051] The application also provides a power assembly for the above-mentioned electric device 1000, which comprises the battery pack 100, an electric power driving device and a charging device. The battery pack 100 provides energy for the electric power driving device. The electric power driving device comprises a motor, a controller, a power converter and the like, and is responsible for converting electric energy into mechanical energy to drive the vehicle to run. The charging device comprises a charging device and a charging port, and the charging device is used for connecting an external power supply and the charging port to charge the battery pack.

[0052] The application also provides a battery pack 100, as shown in Figure 2 and Figure 3 The application also provides a battery pack 100, as shown in

[0053] It should be noted that the battery can be a lead-acid battery, a nickel-hydrogen battery or a lithium-ion battery, and the application does not limit this.

[0054] The shell 10 mainly plays a role in protecting the internal cell module 20 and other components. The shell 10 has good mechanical strength to prevent the battery from being damaged when subjected to external forces such as impact and extrusion. The material of the shell 10 can be metal, ceramic or plastic, and the application does not limit this.

[0055] The cell module 20 is the core unit of the battery energy storage. During the charging process, the electric energy of the external power supply is transmitted to the cell module 20 through the battery management system, the active material of the positive electrode is separated from the positive electrode under the action of the electric field, and the lithium ion is migrated to the negative electrode through the electrolyte and the separator. At the same time, the electrons reach the negative electrode through the external circuit and are combined with the lithium ion to be stored. During the discharging process, the chemical energy stored in the cell module 20 is converted into electric energy. At this time, the lithium ion is separated from the negative electrode, returns to the positive electrode through the electrolyte and the separator, and the electrons flow from the negative electrode to the positive electrode through the external circuit to provide power for the motor and other devices of the electric vehicle. The cell module 20 can be a lithium cell or a lead-acid cell, and the application does not limit this.

[0056] The battery cell module 20 contains a large amount of chemical substances. When the battery cell module 20 experiences thermal runaway, it will generate fumes and electrolyte vapors, along with continuously accumulating pressure. If this pressure is not balanced or released in time, the casing 10 will deform and leak electrolyte. In more serious cases, the battery pack 100 may explode. The explosion-proof valve 30 can quickly release pressure and prevent explosion, solving the problem of excessive pressure in the battery pack 100. The explosion-proof valve 30 in this application can be a direct-acting solenoid valve, a distributed direct-acting solenoid valve, or a pilot-operated solenoid valve; this application does not limit the choice.

[0057] This application provides multiple accommodating cavities 11 spaced apart within the housing 10, with the battery cell module 20 housed within each cavity 11. Different accommodating cavities 11 are connected to different exhaust channels 13. When a battery cell module 20 in one of the accommodating cavities 11 experiences thermal runaway, the resulting flue gas and electrolyte vapor can be discharged from the cavity 11 through a separate exhaust channel 13, and then discharged from the housing 10 through an explosion-proof valve 30 connected to the exhaust channel 13. This prevents the flue gas and electrolyte vapor from flowing back into the cavity 11 where thermal runaway has not occurred, ensuring the safety of other accommodating cavities 11 and thus preventing more severe thermal runaway of the battery pack 100.

[0058] In some embodiments of this application, such as Figure 2 and Figure 4 As shown, the arrows in the figure indicate the direction of gas flow. Multiple receiving cavities 11 are arranged along a first direction, which is perpendicular to the thickness direction of the housing 10. Multiple exhaust channels 13 include a first set of exhaust channels 131 and a second set of exhaust channels 132. Along a second direction, the first set of exhaust channels 131 is located on one side of the housing 10, and the second set of exhaust channels 132 is located on the other side of the housing 10. The second direction is perpendicular to the first direction and also perpendicular to the thickness direction of the housing 10.

[0059] It should be noted that the exhaust passage 13 can be arranged around the periphery of multiple receiving cavities 11, and this application does not limit this.

[0060] In this way, by arranging multiple accommodating cavities 11 along the first direction, and setting the first set of exhaust channels 131 and the second set of exhaust channels 132 along the second direction on both sides of the housing 10, and with the second direction perpendicular to the first direction, it is possible to avoid different exhaust channels 13 from intersecting, thereby improving the exhaust efficiency of the exhaust channels 13. Furthermore, since the second direction is perpendicular to the thickness direction of the housing 10, it is possible to reduce the overall thickness of the battery pack 100, which facilitates the assembly of the battery pack 100.

[0061] In some embodiments of this application, such as Figure 2 and Figure 3As shown in the figure, the arrows indicate the direction of gas flow. Different exhaust channels 13 in the first group of exhaust channels 131 are connected to multiple receiving cavities 11.

[0062] It should be noted that the number of the first set of exhaust channels 131 can be the same as the number of receiving cavities 11, and the number of the first set of exhaust channels 131 can be greater than the number of receiving cavities 11. This application does not limit this.

[0063] In some embodiments of this application, different exhaust channels 13 in the second group of exhaust channels 132 are respectively connected to multiple receiving cavities 11.

[0064] It should be noted that the number of the second set of exhaust channels 132 can be the same as the number of receiving cavities 11, and the number of the second set of exhaust channels 132 can be greater than the number of receiving cavities 11. This application does not limit this.

[0065] In this way, a housing cavity 11 can be connected to one or more exhaust channels 13. When the cell module 20 in the housing cavity 11 experiences thermal runaway, the flue gas and electrolyte vapor generated by the thermal runaway can be discharged from the housing cavity 11 through different exhaust channels 13, avoiding the flue gas and electrolyte vapor from lingering in the housing cavity 11 for a long time and causing more serious thermal runaway, thus improving the safety of the battery pack 100.

[0066] In some embodiments of this application, such as Figure 2 and Figure 3 As shown in the figure, the direction of the arrow indicates the direction of gas flow. The exhaust channels 13 in the first set of exhaust channels 131 are arranged along the thickness direction of the shell 10.

[0067] In some embodiments of this application, such as Figure 2 and Figure 3 As shown in the figure, the direction of the arrow indicates the direction of gas flow. The exhaust channels 13 in the second set of exhaust channels 132 are arranged along the thickness direction of the shell 10.

[0068] This reduces the size of the first set of exhaust channels 131 and / or the second set of exhaust channels 132 in the second direction, thereby reducing the size of the battery pack 100 in the second direction. This avoids inconvenience in installing the battery pack 100 due to its excessive size and improves the ease of installation.

[0069] In some embodiments of this application, such as Figure 2 and Figure 3 As shown in the figure, the arrows indicate the direction of gas flow. The housing 10 is also provided with a manifold 14 and a first opening 12. The first opening 12 connects the manifold 14 with the external space. Multiple exhaust channels 13 are connected to the manifold 14. The explosion-proof valve 30 is located at the first opening 12.

[0070] The confluence cavity 14 can be arranged on one side of the containing cavity 11 along a first direction, or arranged on one side of the containing cavity 11 along a second direction, which is not limited in the application.

[0071] In this way, when the battery cell module 20 in one of the containing cavities 11 occurs thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged to the confluence cavity 14 through the exhaust passage 13, and then discharged out of the shell 10 through the explosion-proof valve 30 of the first opening 12. The explosion-proof valve 30 can be used to prevent and control the entire battery pack 100, thereby reducing the production cost of the battery pack 100, and reducing the number of openings on the shell 10, avoiding that too many openings affect the strength of the shell 10, and improving the strength of the shell 10 of the battery pack 100.

[0072] In some embodiments of the application, as shown in Figure 2 and Figure 5 The battery pack 100 further comprises a plurality of check valves 40, one check valve 40 being connected between one exhaust passage 13 and one containing cavity 11. The check valve 40 is used to disconnect the containing cavity 11 and the exhaust passage 13, and when the gas pressure in the containing cavity 11 is greater than a preset pressure, the check valve 40 is opened to make the gas in the containing cavity 11 flow to the exhaust passage 13.

[0073] The check valve 40 can be a pressure valve or an explosion-proof diaphragm, which is not limited in the application.

[0074] In this way, during normal operation of the battery pack 100, the check valve 40 is used to disconnect the containing cavity 11 and the exhaust passage 13, which can prevent foreign matter from entering the containing cavity 11 and affecting the normal operation of the battery cell module 20. When the battery cell module 20 in one of the containing cavities 11 occurs thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway will increase the gas pressure in the containing cavity 11. When the gas pressure in the containing cavity 11 is greater than a preset pressure, the check valve 40 is opened to make the gas in the containing cavity 11 flow to the exhaust passage 13 until it is discharged out of the shell 10. Other check valves 40 can also prevent the smoke and electrolyte vapor generated by the thermal runaway from entering the containing cavities 11 that do not occur thermal runaway, thereby ensuring the safety of the containing cavities 11 that do not occur thermal runaway, and improving the safety of the battery pack 100.

[0075] In some embodiments of the application, as shown in Figure 2 and Figure 5As shown, the check valve 40 comprises a connecting portion 41 and a check portion 42, the connecting portion 41 is connected with the shell 10, the connecting portion 41 is provided with a first vent hole 411, the first vent hole 411 is in communication with the accommodating cavity 11; the check portion 42 is connected with the connecting portion 41 and located in the exhaust passage 13, the check portion 42 is used for blocking the first vent hole 411, and when the gas pressure in the accommodating cavity 11 is greater than a preset pressure, the check portion 42 can guide the communication between the accommodating cavity 11 and the exhaust passage 13.

[0076] It should be noted that the connecting portion 41 and the shell 10 can be clamped, glued or connected by interference, and the connection between the connecting portion 41 and the shell 10 can meet the sealing connection, which is not limited in the present application.

[0077] The connecting portion 41 and the check portion 42 can be clamped, glued or connected by interference, and the connection between the connecting portion 41 and the check portion 42 can meet the sealing connection, which is not limited in the present application.

[0078] In this way, the connecting portion 41 can be connected with the shell 10, and the first vent hole 411 is connected with the accommodating cavity 11, the check portion 42 can block the first vent hole 411 to prevent sundries from entering the accommodating cavity 11, when the gas pressure in the accommodating cavity 11 is greater than a preset pressure, the check portion 42 can guide the communication between the accommodating cavity 11 and the exhaust passage 13, so that the smoke and electrolyte vapor generated by thermal runaway can be discharged from the accommodating cavity 11, thereby improving the safety of the battery pack 100.

[0079] In some embodiments of the present application, as shown in Figure 5 and Figure 6 As shown, the check portion 42 comprises an elastic shell 43, the elastic shell 43 is provided with an inner cavity in communication with the first vent hole 411; the elastic shell 43 further comprises a first side wall 431 and a second side wall 432 oppositely arranged along the radial direction of the exhaust passage 13, the check portion 42 has a closed state and an open state, when the check portion 42 is in the closed state, one end of the first side wall 431 away from the connecting portion 41 is attached to one end of the second side wall 432 away from the connecting portion 41 to block the first vent hole 411; when the check portion 42 is in the open state, one end of the first side wall 431 away from the connecting portion 41 is separated from one end of the second side wall 432 away from the connecting portion 41 to guide the communication between the accommodating cavity 11 and the exhaust passage 13.

[0080] The material of the elastic shell 43 can be high molecular rubber, rubber synthetic material or memory alloy, which is not limited in the present application.

[0081] In this way, when the battery cell module 20 is in normal operation, the reverse stopping portion 42 is in the closed state, the one end of the first side wall 431 away from the connecting portion 41 is attached to the one end of the second side wall 432 away from the connecting portion 41 to block the first air hole 411; when the battery cell module 20 is in thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can increase the gas pressure in the containing cavity 11, when the gas pressure in the containing cavity 11 is greater than the preset pressure, the elastic shell 43 is elastically deformed, the one end of the first side wall 431 away from the connecting portion 41 is separated from the one end of the second side wall 432 away from the connecting portion 41 when the reverse stopping portion 42 is in the open state, so as to connect the containing cavity 11 and the exhaust passage 13, so that the reverse valve 40 can prevent and control the thermal runaway according to the change of the gas pressure in the containing cavity 11, without the need to set other monitoring devices in the containing cavity 11 to detect whether the battery cell module 20 is in thermal runaway, thereby reducing the production cost of the battery pack 100.

[0082] In some embodiments of the present application, as shown in Figure 5 and Figure 7 the elastic shell 43 further comprises two elastic side walls 433 spaced apart, and the first side wall 431 and the second side wall 432 are connected between the two elastic side walls 433; during the switching process of the reverse stopping portion 42 from the closed state to the open state, the two elastic side walls 433 are elastically deformed to separate the one end of the first side wall 431 away from the connecting portion 41 from the one end of the second side wall 432 away from the connecting portion 41.

[0083] In some embodiments of the present application, as shown in and

[0084] In this way, during the switching process of the reverse stopping portion 42 from the closed state to the open state, the two elastic side walls 433 are elastically deformed to separate the one end of the first side wall 431 away from the connecting portion 41 from the one end of the second side wall 432 away from the connecting portion 41, so as to connect the containing cavity 11 and the exhaust passage 13, and the smoke and electrolyte vapor in the containing cavity 11 are discharged to the exhaust passage 13 through the gap between the one end of the first side wall 431 away from the connecting portion 41 and the one end of the second side wall 432 away from the connecting portion 41, thereby avoiding the smoke and electrolyte vapor from affecting the normal operation of other components of the battery pack 100.

[0085] In some embodiments of the present application, as shown in Figure 2 and Figure 5 In some embodiments of the present application, as shown in

[0086] The second openings 111 can be arranged along a first direction or a second direction, and the application does not make any limitation in this regard.

[0087] In this way, one accommodating cavity 11 can be provided with multiple second openings 111 communicating with the exhaust channel 13, and the check valve 40 is arranged at the second opening 111. When the battery cell module 20 in the accommodating cavity 11 occurs thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged from the accommodating cavity 11 through different check valves 40, which can not only improve the exhaust efficiency of the accommodating cavity 11, but also avoid the smoke and electrolyte vapor staying in the accommodating cavity 11 for a long time to cause more serious thermal runaway. When one check valve 40 fails, other check valves 40 can still discharge the gas from the accommodating cavity 11, thereby improving the safety of the battery pack 100.

[0088] In some embodiments of the application, as shown in Figure 2 and Figure 3 The battery pack 100 further comprises multiple explosion-proof valves 30 arranged at intervals; the shell 10 is further provided with multiple first openings 12 arranged at intervals, the multiple first openings 12 are all in communication with the current collecting cavity 14 and the external space; and one explosion-proof valve 30 is arranged at one first opening 12.

[0089] The first openings 12 can be arranged along a first direction or a second direction, and the application does not make any limitation in this regard.

[0090] In this way, the shell 10 can be provided with multiple first openings 12 communicating with the external space, and the explosion-proof valve 30 is arranged at the first opening 12. When the battery cell module 20 in the accommodating cavity 11 occurs thermal runaway, the smoke and electrolyte vapor generated by the thermal runaway can be discharged from the shell 10 through different explosion-proof valves 30, thereby improving the exhaust efficiency of the shell 10, avoiding the smoke and electrolyte vapor staying in the shell 10 for a long time to cause more serious thermal runaway, and improving the safety of the battery pack 100 when one explosion-proof valve 30 fails.

[0091] The above is only a specific implementation manner of the application, but the protection scope of the application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, comprising: a shell (10) in which a plurality of spaced accommodating cavities (11) and a plurality of spaced exhaust passages (13) are formed, different accommodating cavities (11) being communicated with different exhaust passages (13); a battery cell module (20), at least one battery cell module (20) being arranged in one accommodating cavity (11); an explosion-proof valve (30) blocking a plurality of exhaust passages (13).

2. The battery pack of claim 1, wherein, The plurality of accommodating cavities (11) are arranged along a first direction, the first direction being perpendicular to the thickness direction of the shell (10). The plurality of exhaust passages (13) comprise a first group of exhaust passages (131) and a second group of exhaust passages (132), the first group of exhaust passages (131) being arranged on one side of the shell (10) along a second direction, the second group of exhaust passages (132) being arranged on the other side of the shell (10), the second direction being perpendicular to the first direction and perpendicular to the thickness direction of the shell (10).

3. The battery pack of claim 2, wherein, Different exhaust passages (13) in the first group of exhaust passages (131) are respectively communicated with a plurality of accommodating cavities (11); And / or, different exhaust passages (13) in the second group of exhaust passages (132) are respectively communicated with a plurality of accommodating cavities (11).

4. The battery pack of claim 2, wherein, The exhaust passages (13) in the first group of exhaust passages (131) are arranged along the thickness direction of the shell (10); And / or, the exhaust passages (13) in the second group of exhaust passages (132) are arranged along the thickness direction of the shell (10).

5. The battery pack of any one of claims 1-4, wherein, The shell (10) is further provided with a converging cavity (14) and a first opening (12), the first opening (12) being communicated between the converging cavity (14) and an external space, a plurality of exhaust passages (13) being communicated with the converging cavity (14), and the explosion-proof valve (30) being arranged at the first opening (12).

6. The battery pack of claim 5, wherein, Further comprising: a plurality of check valves (40), one check valve (40) being connected between one exhaust passage (13) and one accommodating cavity (11), the check valve (40) being used for disconnecting the communication between the accommodating cavity (11) and the exhaust passage (13), and when the gas pressure in the accommodating cavity (11) is greater than a preset pressure, the check valve (40) is opened to make the gas in the accommodating cavity (11) flow to the exhaust passage (13).

7. The battery pack of claim 6, wherein, The check valve (40) comprises: a connecting part (41) connected with the shell (10), the connecting part (41) being provided with a first air hole (411) communicated with the accommodating cavity (11); a check part (42) connected with the connecting part (41) and located in the exhaust passage (13), the check part (42) being used for blocking the first air hole (411), and when the gas pressure in the accommodating cavity (11) is greater than a preset pressure, the check part (42) can guide the communication between the accommodating cavity (11) and the exhaust passage (13).

8. The battery pack of claim 7, wherein, The reverse prevention part (42) comprises an elastic shell (43) provided with an inner cavity in communication with the first vent hole (411); The elastic shell (43) further comprises a first side wall (431) and a second side wall (432) oppositely arranged along the radial direction of the exhaust passage (13), the reverse prevention part (42) has a closed state and an open state, when the reverse prevention part (42) is in the closed state, the end of the first side wall (431) away from the connecting part (41) is attached to the end of the second side wall (432) away from the connecting part (41) to block the first vent hole (411); When the reverse prevention part (42) is in the open state, the end of the first side wall (431) away from the connecting part (41) is separated from the end of the second side wall (432) away from the connecting part (41) to connect the accommodation cavity (11) and the exhaust passage (13).

9. The battery pack of claim 8, wherein, The elastic shell (43) further comprises two elastic side walls (433) arranged at intervals, and the first side wall (431) and the second side wall (432) are connected between the two elastic side walls (433); During the switching process of the reverse prevention part (42) from the closed state to the open state, the two elastic side walls (433) are elastically deformed to separate the end of the first side wall (431) away from the connecting part (41) from the end of the second side wall (432) away from the connecting part (41).

10. The battery pack of claim 6, wherein, The inner wall surface of the accommodation cavity (11) is provided with a plurality of second openings (111) in communication with the exhaust passage (13), and one reverse prevention valve (40) is arranged at one second opening (111).

11. The battery pack of claim 6, wherein, Further comprising: A plurality of interval arranged explosion-proof valves (30); The shell (10) is further provided with a plurality of interval arranged first openings (12), and the plurality of first openings (12) are in communication with the converging cavity (14) and the external space; one explosion-proof valve (30) is arranged at one first opening (12).

12. A powertrain, characterized by, The battery pack (100) of any one of claims 1-11.

13. An electrical device, characterized by The battery pack (100) of any one of claims 1-11, or the power assembly of claim 12.

Images