Battery cell assembly, battery pack and electric device

Abstract

A battery cell assembly, a battery pack and an electric device. The battery cell assembly comprises a plurality of first battery cells, a plurality of second battery cells, a first exhaust member, and a second exhaust member. The plurality of first battery cells and the plurality of second battery cells are alternately arranged in sequence and stacked in a first direction, each first battery cell is provided with a first pressure relief member, and each second battery cell is provided with a second pressure relief member. The first exhaust member extends in the first direction, and a plurality of first exhaust holes are formed in the first exhaust member, and respectively face and are in communication with the plurality of first pressure relief members. The second exhaust member extends in the first direction, and a plurality of second exhaust holes are formed in the second exhaust member, and respectively face and are in communication with the plurality of second pressure relief members.

Description

Battery cell assembly, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421558020.6, filed on July 01, 2024, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of battery, in particular to a battery cell assembly, a battery pack and an electric device. BACKGROUND

[0003] As a power source of an electric device, a power battery is one of the important components of the electric device, and the safety of the power battery is particularly important. SUMMARY

[0004] The present disclosure provides a battery cell assembly, a battery pack and an electric device, which are used to solve the problem of low safety of the battery cell assembly.

[0005] In a first aspect, a battery cell assembly is provided, comprising a plurality of first battery cells and a plurality of second battery cells, a first exhaust member and a second exhaust member.

[0006] The plurality of first battery cells and the plurality of second battery cells are arranged alternately and stacked in sequence along a first direction, each of the plurality of first battery cells is provided with a first pressure relief member, each of the plurality of second battery cells is provided with a second pressure relief member, the first pressure relief members of the plurality of first battery cells are located on the same surface of the plurality of first battery cells, the second pressure relief members of the plurality of second battery cells are located on the same surface of the plurality of second battery cells, and the plurality of first pressure relief members are arranged in a row along the first direction, and the plurality of second pressure relief members are arranged in a row along the first direction. The first pressure relief members and the second pressure relief members are arranged spaced apart along a second direction. The second direction is perpendicular to the first direction.

[0007] The first exhaust member extends along the first direction, and the first exhaust member is provided with a plurality of first exhaust holes, each of the plurality of first exhaust holes is opposite to and communicates with a corresponding first pressure relief member. The second exhaust member extends along the first direction, and the second exhaust member is provided with a plurality of second exhaust holes, each of the plurality of second exhaust holes is opposite to and communicates with a corresponding second pressure relief member.

[0008] It can be understood that, by providing the first exhaust member and the second exhaust member, the plurality of first battery cells and the plurality of second battery cells can be communicated respectively, and different exhaust paths can be provided for the plurality of first battery cells and the plurality of second battery cells. In this way, if the battery cell assembly has a thermal runaway problem, the adjacent first battery cells and second battery cells can exhaust through different exhaust members, which can improve the exhaust efficiency of the battery cell assembly, thereby quickly exhausting the heat generated inside the battery cell assembly and avoiding more serious safety problems, and improving the safety of the battery cell assembly.

[0009] In addition, the first exhaust member and the second exhaust member extend along the first direction, do not hinder the gas generated by the thermal runaway of the battery cell assembly, and can make the exhaust more smooth and further improve the exhaust efficiency.

[0010] In some embodiments, the two ends of the first battery cell along the second direction are a first positive electrode end and a first negative electrode end, respectively. The two ends of the second battery cell along the second direction are a second positive electrode end and a second negative electrode end, respectively. The first positive electrode end points in the direction of the first negative electrode end, which is opposite to the direction of the second positive electrode end pointing to the second negative electrode end. Along the second direction, the distance from the first pressure relief member to the first positive electrode end is equal to the distance from the second pressure relief member to the second positive electrode end.

[0011] In some embodiments, the first battery cell further comprises a third pressure relief member, the third pressure relief member and the first pressure relief member are located on the same side wall of the first battery cell, and the third pressure relief member is spaced apart from the first pressure relief member along the second direction. The second battery cell further comprises a fourth pressure relief member, the fourth pressure relief member and the second pressure relief member are located on the same side wall of the second battery cell, and the fourth pressure relief member is spaced apart from the second pressure relief member along the second direction. The third pressure relief members of the plurality of first battery cells are arranged in a row along the first direction, and the fourth pressure relief members of the plurality of second battery cells are arranged in a row along the first direction. The third pressure relief member and the fourth pressure relief member are spaced apart along the second direction.

[0012] The battery cell assembly further comprises a third exhaust member and a fourth exhaust member. The third exhaust member extends along the first direction, and the third exhaust member comprises a plurality of third exhaust holes, and the plurality of third exhaust holes are respectively opposite to and communicate with the plurality of third pressure relief members. The fourth exhaust member extends along the first direction, and the fourth exhaust member comprises a plurality of fourth exhaust holes, and the plurality of fourth exhaust holes are respectively opposite to and communicate with the plurality of fourth pressure relief members.

[0013] In some embodiments, the two ends of the first battery cell along the second direction are a first positive electrode end and a first negative electrode end, respectively. The two ends of the second battery cell along the second direction are a second positive electrode end and a second negative electrode end, respectively. The first positive electrode end points in the direction of the first negative electrode end, which is opposite to the direction of the second positive electrode end pointing to the second negative electrode end. Along the second direction, the distance from the third pressure relief member to the first positive electrode end is equal to the distance from the fourth pressure relief member to the second positive electrode end.

[0014] In some embodiments, the first battery cell and the second battery cell are both rectangular plates, and the thickness direction of the first battery cell and the thickness direction of the second battery cell are consistent with the first direction. The length direction of the first battery cell and the length direction of the second battery cell are consistent with the second direction.

[0015] In some embodiments, the plurality of first exhaust holes and the plurality of second exhaust holes satisfy at least one of: at least one of the plurality of first exhaust holes is provided with a first protection member configured to open the first exhaust hole when the pressure from the outside is greater than or equal to a first preset threshold value. The first preset threshold value is less than the burst threshold value of the first pressure relief member. Or, at least one of the plurality of second exhaust holes is provided with a second protection member configured to open the second exhaust hole when the pressure from the outside is greater than or equal to a second preset threshold value. The second preset threshold value is less than the burst threshold value of the second pressure relief member.

[0016] In some embodiments, the first protection member and the second protection member satisfy at least one of: the first protection member is in a sheet shape, the first protection member covers at least one of the first exhaust holes, and the first protection member is configured to break to open the first exhaust hole when the pressure from the outside is greater than or equal to the first preset threshold value. Or, the second protection member is in a sheet shape, the second protection member covers at least one of the second exhaust holes, and the second protection member is configured to break to open the second exhaust hole when the pressure from the outside is greater than or equal to the second preset threshold value.

[0017] In some embodiments, the first exhaust member and the second exhaust member satisfy at least one of: the first exhaust member includes a first exhaust passage, and the plurality of first exhaust holes communicate with the first exhaust passage. An inner wall surface of the first exhaust passage is provided with a first sink, one end of the plurality of first exhaust holes opening into the first exhaust passage is located on a bottom surface of the first sink, and at least part of the first protection member is accommodated in the first sink. Or, the second exhaust member includes a second exhaust passage, and the plurality of second exhaust holes communicate with the second exhaust passage. An inner wall surface of the second exhaust passage is provided with a second sink, one end of the plurality of second exhaust holes opening into the second exhaust passage is located on a bottom surface of the second sink, and at least part of the second protection member is accommodated in the second sink.

[0018] In some embodiments, the first exhaust passage and the second exhaust passage satisfy at least one of: two ends of the first exhaust passage pass through the first exhaust member and form a first opening and a second opening, respectively, and one of the first opening and the second opening communicates with the air outlet of the air cooling system. Or, two ends of the second exhaust passage pass through the second exhaust member and form a third opening and a fourth opening, respectively, and one of the third opening and the fourth opening communicates with the air outlet of the air cooling system.

[0019] In some embodiments, the battery cell assembly satisfies at least one of the following: the first opening is provided with a first switch valve port, and the second opening is provided with a second switch valve port. The battery cell assembly further comprises a flue gas sensor and a controller. The flue gas sensor is arranged in the first exhaust passage. The controller is electrically connected with the first switch valve port, the second switch valve port, and the flue gas sensor, and is configured to control the first switch valve port and the second switch valve port to open or close according to a detection value of the flue gas sensor. Alternatively, the third opening is provided with a third switch valve port, and the fourth opening is provided with a fourth switch valve port. The battery cell assembly further comprises a flue gas sensor and a controller. The flue gas sensor is arranged in the second exhaust passage. The controller is electrically connected with the third switch valve port, the fourth switch valve, and the flue gas sensor, and is configured to control the third switch valve port and the fourth switch valve port to open or close according to a detection value of the flue gas sensor.

[0020] In a second aspect, a battery pack is provided, comprising a plurality of battery cell assemblies as described above.

[0021] In a third aspect, an electric device is provided, comprising: an electric appliance, and a battery pack as described above, the battery pack being mounted on the electric appliance. Alternatively, a battery cell assembly as described above, the battery cell assembly being mounted on the electric appliance.

[0022] The technical effects brought by any of the implementation manners of the second aspect to the third aspect can refer to the technical effects brought by the corresponding implementation manners of the first aspect, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a schematic view of a vehicle according to some embodiments;

[0024] FIG. 2 is a structural view of a battery pack according to some embodiments;

[0025] FIG. 3 is a structural view of a battery cell assembly according to some embodiments;

[0026] FIG. 4 is another structural view of a battery cell assembly according to some embodiments;

[0027] FIG. 5 is a structural view of a first exhaust member and a second exhaust member according to some embodiments;

[0028] FIG. 6 is yet another structural view of a battery cell assembly according to some embodiments;

[0029] FIG. 7 is yet another structural view of a battery cell assembly according to some embodiments;

[0030] FIG. 8 is a structural view of a first exhaust member, a second exhaust member, a first protective member, and a second protective member according to some embodiments;

[0031] FIG. 9 is a structural view of a first exhaust member and a first protective member according to some embodiments;

[0032] FIG. 10 is a structural diagram of a second exhaust member and a second guard member according to some embodiments;

[0033] FIG. 11 is another structural diagram of a first exhaust member and a first guard member according to some embodiments;

[0034] FIG. 12 is another structural diagram of a second exhaust member and a second guard member according to some embodiments;

[0035] FIG. 13A is a block diagram of an electrical device according to some embodiments;

[0036] FIG. 13B is a block diagram of another electrical device according to some embodiments.

[0037] Reference signs: 1, vehicle; 2, chassis; 3, vehicle body; 4, wheel; 5, battery pack; 6, housing; 7, battery management system; 100, cell assembly; 10, first cell; 11, first pressure relief member; 12, third pressure relief member; 13, first positive electrode terminal; 14, first negative electrode terminal; 15, pole; 20, second cell; 21, second pressure relief member; 22, fourth pressure relief member; 23, second positive electrode terminal; 24, second negative electrode terminal; 30, first exhaust member; 31, first exhaust hole; 32, first exhaust passage; 321, first sink; 322, first opening; 323, second opening; 324, first on-off valve; 325, second on-off valve; 40, second exhaust member; 41, second exhaust hole; 42, second exhaust passage; 421, second sink; 422, third opening; 423, fourth opening; 424, third on-off valve port; 425, fourth on-off valve port; 50, third exhaust member; 51, third exhaust hole; 60, fourth exhaust member; 61, fourth exhaust hole; 70, first guard member; 71, second guard member; 80, smoke sensor; 90, controller; F1, first direction; F2, second direction; 9, electrical device; 8, electrical device. DETAILED DESCRIPTION

[0038] Some embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0039] In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element 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 disclosure.

[0040] The terms "first", "second", "third", etc. are used only for the purpose of description, and should not be interpreted as indicating or implying relative importance or indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0041] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. In addition, when describing pipelines or channels, the "connection" used in the present application has the meaning of conducting. The specific meaning should be understood in combination with the context.

[0042] It should be noted that, in actual application, due to the limitation of equipment precision or installation error, it is difficult to achieve absolute parallel or vertical effect. In the present application, the description of "vertical", "parallel" or "same direction" is not an absolute limiting condition, but indicates that the vertical or parallel structure can be achieved within a predetermined error range, and the corresponding predetermined effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution is easy to implement and has high feasibility. For example, "vertical" includes absolute vertical and approximate vertical, and the acceptable deviation range of approximate vertical can be, for example, within 5°. "Parallel" includes absolute parallel and approximate parallel, and the acceptable deviation range of approximate parallel can be, for example, within 5°. "Same direction" includes absolute same direction and approximate same direction, and the acceptable deviation range of approximate same direction can be, for example, within 5°.

[0043] In some embodiments of the present disclosure, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration, and not necessarily as preferred or advantageous over other embodiments or implementations. In other words, the use of "exemplary" or "for example" is intended to present concepts in a concrete form for purposes of illustration only. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or advantageous than other embodiments or design schemes.

[0044] The power battery is the power source of the electric device, and is one of the important components of the electric device. The safety of the power battery is particularly important.

[0045] In the related art, the battery cell assembly includes a plurality of first battery cells and a plurality of second battery cells, the first battery cell is provided with a first pressure relief member, and the second battery cell is provided with a second pressure relief member. The battery cell assembly further includes an exhaust member provided with a plurality of exhaust holes, and the plurality of exhaust holes are opposite and communicated with the first pressure relief member and the second pressure relief member.

[0046] In this way, the first battery cell and the second battery cell exhaust through the same exhaust member, if the adjacent battery cells have thermal runaway, a large amount of gas is released instantaneously, the exhaust member cannot timely exhaust the gas, and thus a severe safety problem is easily caused.

[0047] Based on this, some embodiments of the present disclosure provide a power utilization device 8, as shown in FIG. 13A, which is a block diagram of a power utilization device according to some embodiments. The power utilization device 8 includes an electrical appliance device 9 and a battery pack 5 mounted on the electrical appliance device 9, or as shown in FIG. 13B, which is a block diagram of another power utilization device according to some embodiments. The power utilization device 8 includes an electrical appliance device 9 and a battery cell assembly 100 mounted on the electrical appliance device 9.

[0048] It should be noted that the power utilization device 8 can be a computer, a vehicle, an airplane, etc.

[0049] For example, the power utilization device 8 is a vehicle.

[0050] As shown in FIG. 1, which is a schematic diagram of a vehicle according to some embodiments, some embodiments of the present disclosure provide a vehicle 1, which can include a chassis 2, a vehicle body 3, and vehicle wheels 4. It can be understood that the vehicle 1 can be a fuel automobile, an electric automobile, a hybrid automobile, a gas automobile, a methanol automobile, a solar automobile, etc. For example, the vehicle 1 can be a passenger car, a sport utility vehicle (SUV), a multi-purpose vehicle (MPV), etc., or a bus, a truck, a semi-trailer, etc. The present disclosure does not limit this.

[0051] The present disclosure takes the vehicle 1 as an example of an electric automobile.

[0052] The chassis 2 can mount the motor and other components of the vehicle 1, form the overall shape of the vehicle 1, and receive the power of the motor to make the vehicle 1 move and ensure normal driving.

[0053] The vehicle body 3 can be mounted on the chassis 2, and the vehicle body 3 is internally formed with a vehicle cabin for the driver, passengers to sit or load goods. It should be noted that when the vehicle 1 is a bus or a passenger car, the vehicle body 3 thereof is generally of a whole structure. When the vehicle 1 is a truck, the vehicle body 3 thereof is generally composed of a cab and a cargo box.

[0054] The wheels 4 can be mounted on the chassis 2 of the vehicle 1 and serve to support and rotate the vehicle 1 during driving. The wheels 4 are usually mounted at the four corners of the vehicle 1, i.e., the four wheels 4 of the vehicle 1 are connected to the shaft of the vehicle 1 through the hub, so that the vehicle 1 can travel smoothly on the ground.

[0055] It should be understood that the above components are only examples of some components of the vehicle 1 and do not limit the structure of the vehicle 1.

[0056] In order to provide power for the vehicle 1, with reference to FIG. 1, the vehicle 1 further comprises a battery pack 5 mounted on the vehicle body.

[0057] In this way, a mounting bracket is arranged at the mounting position of the battery pack 5 on the vehicle body to ensure that the battery pack 5 can be stably fixed on the vehicle 1. The bracket is usually made of a solid metal material and has sufficient load-bearing capacity.

[0058] It should be noted that the mounting position of the battery pack 5 depends on the design of the vehicle 1 manufacturer and the requirements of different vehicle models, and usually takes into account factors such as the center of gravity of the battery pack 5, heat dissipation, maintenance, etc.

[0059] For example, common mounting positions of the battery pack 5 include the chassis 2, the trunk, the bottom of the vehicle 1, etc. Mounting the battery pack 5 on the chassis 2 of the vehicle 1 can lower the center of gravity of the battery, improve the stability of the vehicle 1, and maximize the use of the internal space of the vehicle 1. Mounting the battery pack 5 in the trunk of the vehicle 1 is convenient for installation and maintenance. Mounting the battery pack 5 at the bottom of the vehicle 1 can form a floor design, which is conducive to heat dissipation of the battery pack 5 and stability of the center of gravity of the vehicle 1.

[0060] Referring to FIG. 2, which is a structural diagram of a battery pack according to some embodiments, the battery pack 5 provided in some embodiments of the present disclosure can comprise a shell 6, a plurality of cell assemblies 100, and a battery management system 7, etc.

[0061] In this way, the shell 6 can provide protection and fixation for the plurality of cell assemblies 100, and also protect the battery pack 5 from external environment. The battery management system (BMS) 7 can be used to monitor and manage parameters such as temperature, voltage, and current of the cell assemblies 100, to ensure safe operation of the cell assemblies 100 and prolong the service life of the cell assemblies 100.

[0062] It should be noted that the number of cell assemblies 100 is not limited in the present disclosure and can be set according to actual conditions. For example, the number of cell assemblies 100 can be two, three, four, etc.

[0063] In some embodiments, referring to FIG. 3, FIG. 3 is a structural diagram of an electric cell assembly according to some embodiments. Two electric cell assemblies 100 are taken as examples for illustration in FIG. 3.

[0064] The shell 6 can provide protection and support for the electric cell assembly 100. The electric cell assembly 100 can be fixed in the shell 6 by screws, bolts, etc.

[0065] The number of electric cell assemblies 100 is not limited by the present disclosure and can be set according to actual conditions. For example, the number of batteries can be two, three, four, etc.

[0066] It should be noted that the type of electric cell assembly 100 is not limited by the present disclosure and can be set according to actual conditions.

[0067] In some embodiments, the electric cell assembly 100 can use lithium ion cells, etc. Lithium ion cells have the advantages of high energy density, long cycle life, lightweight, etc., and are suitable for use as a power source for electric vehicles. The use of lithium ion cells in electric vehicles can provide sufficient power output and mileage, while also providing a longer service life and better safety performance for electric vehicles.

[0068] In some embodiments, referring to FIG. 4, FIG. 4 is another structural diagram of an electric cell assembly according to some embodiments, and the electric cell assembly 100 in FIG. 4 is the lower electric cell assembly 100 in FIG. 3. The electric cell assembly 100 includes a plurality of first electric cells 10 and a plurality of second electric cells 20, a first exhaust member 30, and a second exhaust member 40.

[0069] The plurality of first electric cells 10 and the plurality of second electric cells 20 are sequentially and alternately stacked along the first direction F1. In this way, the energy capacity of the electric cell assembly 100 under the same volume can be effectively increased, and the energy density of the battery pack can be improved.

[0070] In some embodiments, one first electric cell 10 and one second electric cell 20 can be alternately stacked.

[0071] In some embodiments, a plurality of first electric cells 10 and one second electric cell 20 can be alternately stacked.

[0072] In some embodiments, one first electric cell 10 and a plurality of second electric cells 20 can be alternately stacked.

[0073] Referring to FIG. 3 and FIG. 4, the first battery cell 10 is provided with the first pressure relief member 11, and the second battery cell 20 is provided with the second pressure relief member 21. The plurality of first pressure relief members 11 of the plurality of first battery cells 10 are located on the same surface of the plurality of first battery cells 10, and the plurality of second pressure relief members 21 of the plurality of second battery cells 20 are located on the same surface of the plurality of second battery cells 20. The plurality of first pressure relief members 11 of the plurality of first battery cells 10 are arranged in a row along the first direction F1, and the plurality of second pressure relief members 21 of the plurality of second battery cells 20 are arranged in a row along the first direction F1. The first pressure relief member 11 and the second pressure relief member 21 are arranged in a spaced manner along the second direction F2. The second direction F2 is perpendicular to the first direction F1.

[0074] The side wall of the battery cell is one of the plurality of side walls of the battery cell that surrounds the first direction F1. In this way, arranging the plurality of first pressure relief members 11 of the plurality of first battery cells 10 and the plurality of second pressure relief members 21 of the plurality of second battery cells 20 in a row along the first direction F1 respectively, and arranging the first pressure relief member 11 and the second pressure relief member 21 in a spaced manner along the second direction F2, can effectively utilize the internal space of the battery, so that the structure inside the battery is more compact.

[0075] It should be noted that the plurality of first pressure relief members 11 are located on the same surface of the plurality of first battery cells 10, and the plurality of second pressure relief members 21 are located on the same surface of the plurality of second battery cells 20. This can be on the same surface of the battery cell assembly, or on different surfaces of the battery cell assembly. The present disclosure does not limit this, and it can be set according to the actual situation.

[0076] For example, the second direction F2 is parallel to the side wall where the first pressure relief member 11 is located or the side wall where the second pressure relief member 21 is located. Referring to FIG. 3 and FIG. 5, FIG. 5 is a structural diagram of a first exhaust member and a second exhaust member according to some embodiments, and the first exhaust member 30 and the second exhaust member 40 are the first exhaust member 30 and the second exhaust member 40 in FIG. 4. The first exhaust member 30 extends along the first direction F1, and the first exhaust member 30 is provided with a plurality of first exhaust holes 31. The plurality of first exhaust holes 31 are respectively opposite to and communicate with the plurality of first pressure relief members 11 of the plurality of first battery cells 10. The second exhaust member 40 extends along the first direction F1, and the second exhaust member 40 is provided with a plurality of second exhaust holes 41. The plurality of second exhaust holes 41 are respectively opposite to and communicate with the plurality of second pressure relief members 21 of the plurality of second battery cells 20.

[0077] In this way, by arranging the first exhaust member 30 and the second exhaust member 40, the plurality of first pressure relief members 11 of the plurality of first battery cells 10 and the plurality of second pressure relief members 21 of the plurality of second battery cells 20 can be respectively communicated, and different exhaust paths can be provided for the plurality of first battery cells 10 and the plurality of second battery cells 20. In this way, if the battery cell assembly 100 has a thermal runaway problem, the adjacent first battery cell 10 and the second battery cell 20 can be exhausted through different exhaust members (e.g., the first exhaust member 30 and the second exhaust member 40), which can improve the exhaust efficiency of the battery cell assembly 100, thereby quickly exhausting the heat generated inside the battery cell assembly 100, avoiding more serious safety problems, and improving the safety of the battery cell assembly 100.

[0078] In addition, the first exhaust member 30 and the second exhaust member 40 extend along the first direction F1, which does not hinder the gas generated by the thermal runaway of the battery cell assembly 100, and can make the exhaust more smooth, further improving the exhaust efficiency.

[0079] In some embodiments, referring to FIG. 4 and in combination with FIG. 6, FIG. 6 is another structural view of a battery cell assembly according to some embodiments, which is a right view of FIG. 4. The two ends of the first battery cell 10 along the second direction F2 are the first positive electrode end 13 and the first negative electrode end 14, respectively. The two ends of the second battery cell 20 along the second direction F2 are the second positive electrode end 23 and the second negative electrode end 24, respectively. The first positive electrode end 13 of the first battery cell 10 points in the direction of the first negative electrode end 14 of the first battery cell 10, which is opposite to the direction of the second positive electrode end 23 of the second battery cell 20 pointing to the second negative electrode end 24 of the second battery cell 20.

[0080] In this way, since the plurality of first battery cells 10 and the plurality of second battery cells 20 need to be connected in series, arranging the first positive electrode end 13 of the first battery cell 10 to point in the direction of the first negative electrode end 14 of the first battery cell 10, which is opposite to the direction of the second positive electrode end 23 of the second battery cell 20 pointing to the second negative electrode end 24 of the second battery cell 20, can simplify the circuit structure inside the battery pack, reduce the circuit complexity, and help improve the reliability and stability of the battery cell assembly 100.

[0081] Along the second direction F2, the distance from the first pressure relief member 11 to the first positive electrode end 13 of the first battery cell 10 is equal to the distance from the second pressure relief member 21 to the second positive electrode end 23 of the second battery cell 20.

[0082] In this way, the installation positions of the first pressure relief member 11 of the first battery cell 10 and the second pressure relief member 21 of the second battery cell 20 can be unified. When the first battery cell 10 and the second battery cell 20 are processed, one mold can be used, reducing the cost of arrangement and manufacturing cost.

[0083] In some embodiments, the first pressure relief member 11 can be located on the upper side of the first battery cell 10, and the second pressure relief member 21 can be located on the upper side of the second battery cell 20, along a direction perpendicular to the first direction F1 and perpendicular to the second direction F2. In this way, the density of the gas is small, and the pressure relief members (e.g., the first pressure relief member 11 and the second pressure relief member 21) are arranged on the upper side of the battery cells (e.g., the first battery cell 10 and the second battery cell 20), which is beneficial to the discharge of the gas.

[0084] In other embodiments, the first pressure relief member 11 can also be located on the lower side of the first battery cell 10, and the second pressure relief member 21 can also be located on the lower side of the second battery cell 20.

[0085] In some embodiments, along the first direction F1, the first pressure relief member 11 can be located on the middle of the first battery cell 10, or on the rear side of the first battery cell 10.

[0086] The first pressure relief member 11 is located on the middle of the first battery cell 10, which facilitates processing and manufacturing.

[0087] In other embodiments, along the first direction F1, the first pressure relief member 11 can be located on the rear side of the first battery cell 10.

[0088] In order to be able to output the electric quantity outwardly, the positive and negative poles of the first battery cell 10 and the second battery cell 20 are provided with pole pieces 15, and the distance between the pole piece 15 of the first positive pole 13 of the first battery cell 10 and the pole piece 15 of the second negative pole 24 of the second battery cell 20 relative to the bottom of the battery cell 100 is different. In this way, the position of the pole piece matched with the pole piece 15 on the shell can also be arranged in a staggered manner, which can avoid a larger installation space for other devices in the shell, and make the structure more compact.

[0089] In some embodiments, referring to FIGS. 3 and 4, the first battery cell 10 is further provided with a third pressure relief member 12, the third pressure relief member 12 and the first pressure relief member 11 are located on the same side wall of the first battery cell 10, and the third pressure relief member 12 and the first pressure relief member 11 are arranged in a spaced manner along the second direction F2. The second battery cell 20 is further provided with a fourth pressure relief member 22, the fourth pressure relief member 22 and the second pressure relief member 21 are located on the same side wall of the second battery cell 20, and the fourth pressure relief member 22 and the second pressure relief member 21 are arranged in a spaced manner along the second direction F2. The plurality of third pressure relief members 12 of the plurality of first battery cells 10 are arranged in a row along the first direction F1, and the plurality of fourth pressure relief members 22 of the plurality of second battery cells 20 are arranged in a row along the first direction F1. The third pressure relief member 12 and the fourth pressure relief member 22 are arranged in a spaced manner along the second direction F2.

[0090] In this way, the first electric cell 10 can include the first pressure relief member 11 and the third pressure relief member 12, and the second electric cell 20 can include the second pressure relief member 21 and the fourth pressure relief member 22, which can improve the efficiency of gas discharge when the electric cell assembly 100 is in thermal runaway, quickly discharge the heat generated inside the electric cell assembly 100, avoid more serious safety problems, and improve the safety of the electric cell assembly 100.

[0091] Referring to FIGS. 3 and 4, the electric cell assembly 100 further includes a third exhaust member 50 and a fourth exhaust member 60. The third exhaust member 50 extends along the first direction F1, and the third exhaust member 50 is provided with a plurality of third exhaust holes 51 that are respectively opposite to and in communication with the plurality of third pressure relief members 12. The fourth exhaust member 60 extends along the first direction F1, and the fourth exhaust member 60 is provided with a plurality of fourth exhaust holes 61 that are respectively opposite to and in communication with the plurality of fourth pressure relief members 22.

[0092] In this way, the third exhaust member 50 and the fourth exhaust member 60 are provided to respectively communicate the third pressure relief members 12 of the plurality of first electric cells 10 and the fourth pressure relief members 22 of the plurality of second electric cells 20, which can provide different exhaust paths for the plurality of first electric cells 10 and the plurality of second electric cells 20, improve the exhaust efficiency, and further improve the safety of the electric cell assembly 100. In addition, the third exhaust member 50 and the fourth exhaust member 60 extend along the first direction F1, which does not hinder the gas generated by the thermal runaway of the electric cell assembly 100, can make the exhaust more smooth, and further improve the exhaust efficiency.

[0093] In other embodiments, the first electric cell 10 can further include a fifth pressure relief member, and the second electric cell 20 can further include a sixth pressure relief member. The electric cell assembly 100 further includes a fifth exhaust member and a sixth exhaust member, so that the exhaust efficiency of the electric cell assembly 100 is higher.

[0094] In some embodiments, the first electric cell 10 has a first positive electrode end 13 and a first negative electrode end 14 at two ends thereof along a second direction F2. The second electric cell 20 has a second positive electrode end 23 and a second negative electrode end 24 at two ends thereof along the second direction F2, and the first positive electrode end 13 of the first electric cell 10 is directed in a direction opposite to that of the second positive electrode end 23 of the second electric cell 20.

[0095] Along the second direction F2, the distance from the third pressure relief member 12 to the first positive electrode end 13 of the first electric cell 10 is equal to the distance from the fourth pressure relief member 22 to the second positive electrode end 23 of the second electric cell 20.

[0096] In this way, the mounting positions of the third pressure relief member 12 of the first battery cell 10 and the fourth pressure relief member 22 of the second battery cell 20 are unified. When the first battery cell 10 and the second battery cell 20 are processed, one mold can be used, thereby reducing the cost of installation and the manufacturing cost.

[0097] In some embodiments, the distance from the first pressure relief member 11 to the positive electrode end (e.g., the first positive electrode end 13) of the first battery cell 10 along the second direction F2 can be greater than the distance from the third pressure relief member 12 to the positive electrode end of the first battery cell 10. Referring to FIG. 7, which is another structural view of a battery cell assembly according to some embodiments, some embodiments of the present disclosure are described by way of example with the distance from the first pressure relief member 11 to the positive electrode end of the first battery cell 10 being less than the distance from the third pressure relief member 12 to the positive electrode end of the first battery cell 10. In this way, the design of the first pressure relief member 11 and the third pressure relief member 12 of the first battery cell 10 is more reasonable, which is conducive to the discharge of gas.

[0098] In some other embodiments, the distance from the first pressure relief member 11 to the positive electrode end of the first battery cell 10 along the second direction F2 can also be less than the distance from the third pressure relief member 12 to the positive electrode end of the first battery cell 10.

[0099] In some embodiments, the first battery cell 10 and the second battery cell 20 are both rectangular plates, and the thickness direction of the first battery cell 10 and the thickness direction of the second battery cell 20 are consistent with the first direction F1, and the length direction of the first battery cell 10 and the length direction of the second battery cell 20 are consistent with the second direction F2.

[0100] In this way, multiple pressure relief members are provided in the length direction of the first battery cell 10 and the second battery cell 20, which can make the exhaust gas in the length direction pass through the multiple pressure relief members and be discharged more uniformly, thereby improving the exhaust efficiency. In addition, the shape of the battery cell assembly 100 can be more regular, the internal space of the battery cell assembly 100 can be effectively utilized, the space waste can be reduced, the energy density of the battery cell assembly 100 can be improved, the battery cell assembly 100 can be more compact, and the overall volume can be reduced.

[0101] In some embodiments, the length of the first battery cell 10 and the length of the second battery cell 20 are consistent, the width of the first battery cell 10 and the width of the second battery cell 20 are consistent, and the thickness of the first battery cell 10 and the thickness of the second battery cell 20 are consistent.

[0102] In this way, the structure of the entire battery cell assembly 100 can be more uniform and stable, the mismatch between components can be reduced, the possibility of structural stress concentration caused by differences in the sizes of different parts can be reduced, and the structural stability of the battery cell assembly 100 can be improved.

[0103] In some other embodiments, the length of the first cell 10 can be different from the length of the second cell 20, the width of the first cell 10 can be different from the width of the second cell 20, and the height of the first cell 10 can be different from the height of the second cell 20.

[0104] In some embodiments, referring to FIG. 8, which is a structural diagram of a first vent, a second vent, a first shield, and a second shield according to some embodiments, the first vent 31 is provided with a first shield 70, the first shield 70 is in a sheet shape, and the first shield 70 covers the first vent 31. The first shield 70 is configured to open the first vent 31 when the pressure from the first pressure relief member 11 is greater than or equal to a first preset threshold. The first preset threshold is less than the burst threshold of the first pressure relief member 11.

[0105] In this way, the first pressure relief member 11 is a normally closed valve. When the first cell 10 is in thermal runaway, the gas pushes the first pressure relief member 11 open, and the first pressure relief member 11 applies pressure to the first shield 70. When the pressure is greater than the preset threshold of the first shield 70, the first shield 70 can open the first vent 31, and the gas is discharged from the first vent 31. When the first cell 10 is in thermal runaway, the first shield 70 can protect other cells that are not in thermal runaway. In addition, the first shield 70 can prevent dust and water from entering the first cell 10.

[0106] In some embodiments, each first vent 31 can be provided with a first shield 70.

[0107] In some other embodiments, some of the first vents 31 can be provided with a first shield 70.

[0108] In some embodiments, the second vent 41 is provided with a second shield 71, and the second shield 71 is configured to open the second vent 41 when the pressure from the outside is greater than or equal to a second preset threshold. The second preset threshold is less than the burst threshold of the second pressure relief member 21.

[0109] In some embodiments, each second vent 41 can be provided with a second shield 71.

[0110] In some other embodiments, some of the second vents 41 can be provided with a second shield 71.

[0111] In some embodiments, the first shield 70 is in a sheet shape, the first shield 70 covers the first vent 31, and the first shield 70 is configured to break to open the first vent 31 when the pressure from the first pressure relief member 11 is greater than or equal to a first preset threshold.

[0112] In this way, when the first battery cell 10 is in thermal runaway, the gas pushes the first pressure relief member 11 away, and the first pressure relief member 11 applies pressure to the first protective member 70. When the pressure is greater than the first preset threshold of the first protective member 70, the first protective member 70 breaks to open the first exhaust hole 31, which does not block the discharge of the gas, and the discharge of the gas is smoother, improving the exhaust efficiency.

[0113] In some embodiments, the second protective member 71 is in the form of a sheet, and the second protective member 71 covers the second exhaust hole 41. The second protective member 71 is used to open the second exhaust hole 41 when the pressure from the second pressure relief member 21 is greater than or equal to the second preset threshold. The second preset threshold is less than the burst threshold of the second pressure relief member 21.

[0114] For example, the first protective member 70 and the second protective member 71 can be made of high-temperature-resistant materials, such as mica sheets, ceramics, etc.

[0115] In some embodiments, referring to FIG. 9, the first exhaust member 30 includes a first exhaust passage 32, and the first exhaust hole 31 communicates with the first exhaust passage 32. The inner wall surface of the first exhaust passage 32 is provided with a first groove 321, one end of the first exhaust hole 31 opening into the first exhaust passage 32 is located on the bottom surface of the first groove 321, and at least part of the first protective member 70 is accommodated in the first groove 321.

[0116] In this way, by accommodating the first protective member 70 in the first groove 321, the position of the first protective member 70 can be fixed to a certain extent, preventing it from moving or shaking during operation, improving the stability of the first protective member 70, and effectively protecting the internal elements of the battery cell assembly 100.

[0117] In some embodiments, the first protective member 70 can be located entirely in the first groove 321. Referring to FIG. 9, which is a structural diagram of a first exhaust member and a first protective member according to some embodiments, the first protective member 70 is located entirely in the first groove 321, and the side of the first protective member 70 away from the first pressure relief member 11 is flush with the inner wall surface of the first exhaust passage 32. In this way, the inner wall of the first exhaust passage 32 is relatively flat, which is conducive to the discharge of the gas.

[0118] In other embodiments, the first protective member 70 can also be partially located in the first groove 321.

[0119] In some embodiments, referring again to FIG. 9, the two ends of the first exhaust passage 32 penetrate the first exhaust member 30 and form a first opening 322 and a second opening 323, respectively, and one of the first opening 322 and the second opening 323 communicates with the air outlet of the air cooling system.

[0120] In this way, the air cooling system is arranged to facilitate the air flow in the first exhaust passage 32, thereby accelerating the discharge of the gas generated by the thermal runaway of the battery cell assembly 100.

[0121] In some embodiments, FIG. 10 is a structural diagram of a second exhaust member and a second protective member according to some embodiments. The second exhaust member 40 includes a second exhaust passage 42, and the second exhaust hole 41 communicates with the second exhaust passage 42. The inner wall surface of the second exhaust passage 42 is provided with a second groove 421, and the end of the second exhaust hole 41 communicating with the second exhaust passage 42 is open on the bottom surface of the second groove 421, and at least part of the second protective member 71 is accommodated in the second groove 421.

[0122] In some embodiments, the two ends of the second exhaust passage 42 penetrate through the second exhaust member 40 and form a third opening 422 and a fourth opening 423, respectively, and one of the third opening 422 and the fourth opening 423 communicates with the air outlet of the air cooling system.

[0123] In some embodiments, the air cooling system can be connected to the air.

[0124] In other embodiments, the air cooling system can also be connected to the refrigeration system to introduce cold air.

[0125] In some embodiments, referring to FIG. 11, FIG. 11 is another structural diagram of a first exhaust member and a first protective member according to some embodiments. The first opening 322 is provided with a first switch valve 324, and the second opening 323 is provided with a second switch valve 325. The battery cell assembly 100 further includes a smoke sensor 80 and a controller 90. The smoke sensor 80 is arranged in the first exhaust passage 32. The controller 90 is electrically connected with the first switch valve 324, the second switch valve 325, and the smoke sensor 80, and the controller 90 is configured to control the first switch valve 324 and the second switch valve 325 to open or close according to the detection value of the smoke sensor 80.

[0126] In this way, the first switch valve 324 arranged at the first opening 322 and the second switch valve 325 arranged at the second opening 323 can isolate the first exhaust passage 32 from the external environment, thereby improving the waterproof and dustproof effect of the battery cell assembly 100. The smoke sensor 80 can detect the smoke concentration in the first exhaust passage 32, and accurately determine the occurrence of the thermal runaway of the battery cell assembly 100.

[0127] In this way, the controller 90 monitors the detection value of the smoke sensor 80 to timely find the abnormal situation that may exist in the battery cell assembly 100, and controls the first switch valve 324 and the second switch valve 325 to open or close reasonably, so as to achieve the purpose of removing harmful gas or slowing down the spread of abnormal situation, thereby improving the safety of the battery cell assembly 100.

[0128] In addition, the controller 90 can be used to automatically monitor and control the operation state of the battery cell assembly 100, improve the operation efficiency, reduce the manual intervention, reduce the operation cost, and improve the overall management level of the battery cell assembly 100.

[0129] In some embodiments, the flue gas sensor 80 can detect the flue gas in the first exhaust passage 32.

[0130] In some other embodiments, the flue gas sensor 80 can also detect the temperature in the first exhaust passage 32.

[0131] In some embodiments, referring to FIG. 12, which is another structure diagram of a second exhaust member and a second protection member according to some embodiments, the third opening 422 is provided with a third switch valve port 424, and the fourth opening 423 is provided with a fourth switch valve port 425. The battery cell assembly 100 further includes the flue gas sensor 80 and the controller 90. The flue gas sensor 80 is arranged in the second exhaust passage 42. The controller 90 is electrically connected with the third switch valve port 424, the fourth switch valve port 425, and the flue gas sensor 80, and is configured to control the third switch valve port 424 and the fourth switch valve port 425 to open or close according to the detection value of the flue gas sensor 80.

[0132] In some embodiments, the third exhaust member 50, the fourth exhaust member 60, the fifth exhaust member, and the sixth exhaust member can also be arranged as described above.

[0133] Although the present disclosure is described in conjunction with specific features and embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as can come within the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided such modifications and variations come within the scope of the appended claims and their equivalents. It is therefore intended that the present disclosure not be limited to the specific illustrative embodiments herein, but rather only limited as provided in the appended claims.

[0134] The above merely shows the specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An electric cell assembly (100), comprising: a plurality of first electric cells (10) and a plurality of second electric cells (20), the plurality of first electric cells (10) and the plurality of second electric cells (20) being arranged in sequence and alternately along a first direction (F1); each of the plurality of first electric cells (10) is provided with a first pressure relief member (11), each of the plurality of second electric cells (20) is provided with a second pressure relief member (21), the plurality of first pressure relief members (11) of the plurality of first electric cells (10) are located on a same surface of the plurality of first electric cells (10), the plurality of second pressure relief members (21) of the plurality of second electric cells (20) are located on a same surface of the plurality of second electric cells (20), and the plurality of first pressure relief members (11) are arranged in a row along the first direction (F1), and the plurality of second pressure relief members (21) are arranged in a row along the first direction (F1); the first pressure relief members (11) and the second pressure relief members (21) are arranged in a staggered manner along a second direction (F2); wherein the second direction (F2) is perpendicular to the first direction (F1); a first exhaust member (30) extending along the first direction (F1), and the first exhaust member (30) is provided with a plurality of first exhaust holes (31), and the plurality of first exhaust holes (31) are respectively opposite to and communicate with the plurality of first pressure relief members (11); and a second exhaust member (40) extending along the first direction (F1), and the second exhaust member (40) is provided with a plurality of second exhaust holes (41), and the plurality of second exhaust holes (41) are respectively opposite to and communicate with the plurality of second pressure relief members (21).

2. The electric cell assembly (100) according to claim 1, wherein The two ends of the first electric cell (10) along the second direction (F2) are respectively a first positive electrode end (13) and a first negative electrode end (14); the two ends of the second electric cell (20) along the second direction (F2) are respectively a second positive electrode end (23) and a second negative electrode end (24), and the first positive electrode end (13) is directed to the direction of the first negative electrode end (14), which is opposite to the direction of the second positive electrode end (23) to the second negative electrode end (24); Along the second direction (F2), the distance from the first pressure relief member (11) to the first positive electrode end (13) is equal to the distance from the second pressure relief member (21) to the second positive electrode end (23).

3. The electric cell assembly (100) according to claim 1 or 2, wherein The first electric cell (10) is further provided with a third pressure relief member (12), the third pressure relief member (12) and the first pressure relief member (11) are located on a same side wall of the first electric cell (10), and the third pressure relief member (12) and the first pressure relief member (11) are arranged in a staggered manner along the second direction (F2); The second electric cell (20) is further provided with a fourth pressure relief member (22), the fourth pressure relief member (22) and the second pressure relief member (21) are located on a same side wall of the second electric cell (20), and the fourth pressure relief member (22) and the second pressure relief member (21) are arranged in a staggered manner along the second direction (F2); A plurality of third pressure relief members (12) of the plurality of first battery cells (10) are arranged in a row along the first direction (F1), and a plurality of fourth pressure relief members (22) of the plurality of second battery cells (20) are arranged in a row along the first direction (F1); the third pressure relief members (12) and the fourth pressure relief members (22) are arranged at intervals along the second direction (F2); The battery cell assembly (100) further comprises: A third exhaust member (50) extending along the first direction (F1), and the third exhaust member (50) is provided with a plurality of third exhaust holes (51) respectively opposite and communicating with the plurality of third pressure relief members (12); and A fourth exhaust member (60) extending along the first direction (F1), and the fourth exhaust member (60) is provided with a plurality of fourth exhaust holes (61) respectively opposite and communicating with the plurality of fourth pressure relief members (22).

4. The electric cell assembly (100) of claim 3, wherein, The first battery cell (10) has a first positive electrode end (13) and a first negative electrode end (14) at two ends thereof along the second direction (F2); the second battery cell (20) has a second positive electrode end (23) and a second negative electrode end (24) at two ends thereof along the second direction (F2), and the first positive electrode end (13) is directed to the direction of the first negative electrode end (14) and is opposite to the direction of the second positive electrode end (23) directed to the second negative electrode end (24). Along the second direction (F2), the distance from the third pressure relief member (12) to the first positive electrode end (13) is equal to the distance from the fourth pressure relief member (22) to the second positive electrode end (23).

5. The electric cell assembly (100) according to any one of claims 1 to 4, wherein, The first battery cell (10) and the second battery cell (20) are both rectangular plates, and the thickness direction of the first battery cell (10) and the thickness direction of the second battery cell (20) are consistent with the first direction (F1); the length direction of the first battery cell (10) and the length direction of the second battery cell (20) are consistent with the second direction (F2).

6. The electric cell assembly (100) according to any one of claims 1 to 5, wherein, The plurality of first exhaust holes (31) and the plurality of second exhaust holes (41) satisfy at least one of the following conditions: At least one first exhaust hole (31) of the plurality of first exhaust holes (31) is provided with a first protection member (70) configured to open the first exhaust hole (31) when the pressure from the outside is greater than or equal to a first preset threshold; the first preset threshold is less than the burst threshold of the first pressure relief member (11); or At least one second exhaust hole (41) of the plurality of second exhaust holes (41) is provided with a second protection member (71) configured to open the second exhaust hole (41) when the pressure from the outside is greater than or equal to a second preset threshold; the second preset threshold is less than the burst threshold of the second pressure relief member (21).

7. The electric cell assembly (100) of claim 6, wherein, The first protection member (70) and the second protection member (71) satisfy at least one of the following conditions: The first protective piece (70) is in a sheet shape, covers the at least one first exhaust hole (31), and is configured to break to open the at least one first exhaust hole (31) when the pressure from the outside is greater than or equal to the first preset threshold; or, The second protective piece (71) is in a sheet shape, covers the at least one second exhaust hole (41), and is configured to break to open the at least one second exhaust hole (41) when the pressure from the outside is greater than or equal to the second preset threshold.

8. The electric cell assembly (100) according to claim 6 or 7, wherein The first exhaust piece (30) and the second exhaust piece (40) satisfy at least one of the following: The first exhaust piece (30) includes a first exhaust passage (32), and the plurality of first exhaust holes (31) are in communication with the first exhaust passage (32); an inner wall surface of the first exhaust passage (32) is provided with a first sink (321), one end of the plurality of first exhaust holes (31) opening the first exhaust passage (32) is located on a bottom surface of the first sink (321), and at least part of the first protective piece (70) is accommodated in the first sink (321); or, The second exhaust piece (40) includes a second exhaust passage (42), and the plurality of second exhaust holes (41) are in communication with the second exhaust passage (42); an inner wall surface of the second exhaust passage (42) is provided with a second sink (421), one end of the plurality of second exhaust holes (41) opening the second exhaust passage (42) is located on a bottom surface of the second sink (421), and at least part of the second protective piece (71) is accommodated in the second sink (421).

9. The electric cell assembly (100) of claim 8, wherein, The first exhaust passage (32) and the second exhaust passage (42) satisfy at least one of the following: Two ends of the first exhaust passage (32) penetrate through the first exhaust piece (30) and form a first opening (322) and a second opening (323) respectively, and one of the first opening (322) and the second opening (323) is in communication with an air outlet of a forced air cooling system; or, Two ends of the second exhaust passage (42) penetrate through the second exhaust piece (40) and form a third opening (422) and a fourth opening (423) respectively, and one of the third opening (422) and the fourth opening (423) is in communication with the air outlet of the forced air cooling system.

10. The electric cell assembly (100) of claim 9, wherein, The battery cell assembly (100) satisfies at least one of the following: The first opening (322) is provided with a first switch valve port (324), and the second opening (323) is provided with a second switch valve port (325); The battery cell assembly (100) further includes: A flue gas sensor (80) arranged in the first exhaust passage (32); and a controller (90) electrically connected with the first switch valve port (324), the second switch valve port (325), and the flue gas sensor (80), the controller (90) being configured to control the first switch valve port (324) and the second switch valve port (325) to open or close according to a detection value of the flue gas sensor (80); or, the third opening (422) is provided with a third switch valve port (424), and the fourth opening (423) is provided with a fourth switch valve port (425); the electric cell assembly (100) further comprises: a flue gas sensor (80) arranged in the second exhaust passage (42); and a controller (90) electrically connected with the third switch valve port (424), the fourth switch valve port (425), and the flue gas sensor (80), the controller (90) being configured to control the third switch valve port (424) and the fourth switch valve port (425) to open or close according to a detection value of the flue gas sensor (80).

11. A battery pack (5) comprising a plurality of electric cell assemblies (100) according to any one of claims 1 to 10.

12. An electric device (8) comprising: an electric appliance (9); and a battery pack (5) according to claim 11, the battery pack (5) being mounted on the electric appliance (9); or an electric cell assembly (100) according to any one of claims 1 to 10, the electric cell assembly (100) being mounted on the electric appliance (9). ​

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