Battery cell, battery device, and electric device

Abstract

This utility model discloses a battery cell, a battery device, and an electrical device, relating to the field of battery technology. The battery cell includes a housing, a battery cell, and multiple protrusions. In a first direction, a pressure relief portion is provided on one side of the housing. The multiple protrusions are located on the inner wall of the housing, and at least some of the protrusions extend obliquely away from the pressure relief portion relative to the housing in the first direction. The battery cell is disposed inside the housing, and the multiple protrusions abut against the battery cell to at least limit the displacement of the battery cell in the first direction. By providing multiple protrusions on the inner wall of the housing that can abut against the battery cell, and by making at least some of the protrusions extend obliquely away from the pressure relief portion relative to the housing in the first direction, the displacement of the battery cell in the first direction is effectively limited. When the battery cell experiences thermal runaway, this helps to prevent the battery cell from moving towards the pressure relief portion under the drive of gas, reducing the risk of the battery cell blocking the pressure relief portion, thereby improving the smoothness of gas venting and pressure relief of the battery cell during thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, the battery cells, as core components, have high requirements in terms of both energy density and safety.

[0003] In related technologies, when a battery cell experiences thermal runaway and attempts to release pressure, the gas can easily drive the cell to move, causing the cell to block the pressure relief section. This can prevent the battery cell from effectively releasing pressure and affect its safety. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell with good cell stability, which is beneficial to improving the effectiveness of venting and depressurization in the battery cell.

[0005] Firstly, this application proposes a single battery cell.

[0006] Secondly, this application proposes a battery device.

[0007] Thirdly, this application proposes an electrical device.

[0008] A battery cell according to an embodiment of this application includes: a housing, wherein a pressure relief portion is provided on one side of the housing in a first direction; a plurality of protrusions, wherein the plurality of protrusions are disposed on the inner wall of the housing, and at least a portion of the protrusions extend obliquely away from the pressure relief portion relative to the housing in the first direction; and a battery cell disposed within the housing, wherein the plurality of protrusions abut against the battery cell to at least limit the displacement of the battery cell in the first direction.

[0009] In the above technical solution, by providing multiple protrusions on the inner wall of the casing that can abut against the battery cell, the displacement of the battery cell in the first direction is restricted. By further extending at least some of the protrusions at an angle relative to the casing in the first direction away from the pressure relief part, the limiting effect of the protrusions on the battery cell is improved. When the battery cell experiences thermal runaway, it helps to prevent the battery cell from moving towards the pressure relief part under the drive of gas, thereby reducing the risk of the battery cell blocking the pressure relief part, improving the effectiveness of opening the pressure relief part, and thus improving the smoothness of gas venting and pressure relief of the battery cell during thermal runaway, thereby improving the safety of the battery cell.

[0010] According to some embodiments of this application, the tilt angle of the protrusion relative to the first direction ranges from 5° to 60°.

[0011] In the above technical solution, by designing the range of the tilt angle of the protrusion relative to the first direction, it is beneficial to improve the limiting effect of the protrusion on the battery cell on the one hand, and to reduce the space occupied by the protrusion in the housing on the other hand, so as to increase the space that can be used to arrange the battery cell in the housing, thereby increasing the capacity of the battery cell.

[0012] According to some embodiments of this application, the tilt angle of the protrusion relative to the first direction ranges from 5° to 30°.

[0013] In the above technical solution, by further designing the range of the tilt angle of the protrusion relative to the first direction, it is beneficial to improve the limiting effect of the protrusion on the battery cell on the one hand, and to further reduce the space occupied by the protrusion in the housing on the other hand, so as to further increase the space in the housing that can be used to arrange the battery cell, thereby further increasing the capacity of the battery cell.

[0014] According to some embodiments of this application, the end of the protrusion away from the housing is a contact end, and at least the cross-sectional area of ​​the contact end gradually decreases in the direction away from the housing.

[0015] In the above technical solution, by making the cross-sectional area of ​​at least the contact end gradually decrease in the direction away from the shell, it is beneficial to improve the assembly reliability of the protrusion, and at the same time, it is also convenient for the protrusion to deform, so as to reduce the risk of the protrusion damaging the cell and improve the safety of the battery cell.

[0016] According to some embodiments of this application, the protrusion is formed as an elastic element.

[0017] In the above technical solution, by making the protrusion into an elastic element, firstly, it is beneficial to further reduce the risk of the protrusion damaging the cell; secondly, it is beneficial to reduce the assembly difficulty of the protrusion and improve the production and assembly efficiency of the battery cell; and thirdly, the protrusion can also absorb vibration, which is beneficial to improve the stability of the battery cell and extend its service life.

[0018] According to some embodiments of this application, the sidewall of the housing is provided with a plurality of protrusions spaced apart along a first direction.

[0019] In the above technical solution, by providing multiple protrusions spaced apart along the first direction on the side wall of the casing, it is beneficial to improve the limiting effect of the protrusions on the battery cell and improve the stability of the battery cell. On the other hand, multiple protrusions are beneficial to disperse stress and reduce the risk of damage to a single protrusion due to stress concentration. At the same time, it is beneficial to reduce the risk of battery cell damage due to stress concentration at the contact position between the battery cell and the protrusion, thereby improving the safety and stability of the battery cell and extending the service life of the battery cell.

[0020] According to some embodiments of this application, the housing has a plurality of protrusions on at least two oppositely disposed sidewalls.

[0021] In the above technical solution, by providing multiple protrusions on at least two oppositely arranged side walls of the casing, it is beneficial to further improve the limiting effect of the protrusions on the battery cell, effectively constrain the swing of the battery cell, improve the stability of the battery cell, improve the safety and stability of the battery cell, and extend the service life of the battery cell.

[0022] According to some embodiments of this application, the protrusion height of each protrusion ranges from 0.3mm to 3mm.

[0023] In the above technical solution, by designing the range of protrusion height for each protrusion, it is beneficial to improve the convenience of cell assembly, reduce the risk of protrusion damage, reduce the space occupied by the protrusion in the casing, and increase the capacity of the battery cell. On the other hand, it is also beneficial to improve the limiting effect of the protrusion on the cell and reduce the risk of the cell detaching from the protrusion.

[0024] According to some embodiments of this application, the battery cell further includes a fixing plate, which is fixed to the inner wall of the housing. The fixing plate is provided with a plurality of protrusions, and each protrusion is fixed to the housing by a corresponding fixing plate.

[0025] In the above technical solution, by setting a fixing plate, it is convenient to realize the modular assembly of multiple protrusions, improve the assembly convenience of multiple protrusions, and help reduce the assembly difficulty of multiple protrusions, thereby helping to improve the production and assembly efficiency of battery cells.

[0026] According to some embodiments of this application, an airflow channel extending at least along the first direction is provided between the housing and the battery cell.

[0027] In the above technical solution, by providing an airflow channel extending at least in a first direction between the casing and the cell, the airflow generated when the battery cell experiences thermal runaway is guided, effectively improving the smoothness and orderliness of the airflow. This facilitates the acceleration of gas discharge from the casing, reducing the risk of casing explosion. It also helps reduce heat transfer from the thermally runaway battery cell to surrounding battery cells, suppressing the spread of thermal runaway. Furthermore, it helps reduce the impact of gas on the cell, reducing the stress on the cell and thus reducing the risk of the cell moving towards the pressure relief section.

[0028] According to some embodiments of this application, the inner wall of the housing is provided with a plurality of protrusions spaced apart along a first direction, each of the protrusions being provided with a through hole, and the plurality of through holes arranged in the first direction defining the airflow channel.

[0029] In the above technical solution, by providing through holes in each protrusion, multiple through holes arranged in the first direction define the airflow channel. On the one hand, this can guide the airflow generated when the battery cell experiences thermal runaway, effectively improving the smoothness and orderliness of the airflow. On the other hand, it also helps to reduce the risk of electrolyte leakage and improve the safety of the battery cell.

[0030] According to some embodiments of this application, the inner wall of the housing is provided with multiple layers of protrusions spaced apart in a first direction. Each layer of the protrusions includes at least two spaced protrusions. An air passage is defined between the spaced protrusions in each layer of the protrusions, and the air passages of the multiple layers of the protrusions define the airflow passage.

[0031] In the above technical solution, by defining the air passage between the protrusions spaced apart in each layer of protrusions, and defining the airflow passage in the multiple layers of protrusions, firstly, the airflow generated when the battery cell experiences thermal runaway can be guided, effectively improving the smoothness and orderliness of the airflow; secondly, it reduces the risk of electrolyte leakage and improves the safety of the battery cell; and thirdly, it simplifies the processing steps of the airflow passage, reduces the processing difficulty and cost of the airflow passage, and improves production efficiency.

[0032] The battery device according to an embodiment of this application includes a plurality of battery cells, each of which is the battery cell described above.

[0033] The battery device has the same advantages as the aforementioned battery cell, which will not be elaborated here.

[0034] The electrical device according to the embodiments of this application includes the battery device described above, or includes the battery cell described above.

[0035] The electrical device described above has the same advantages as the battery device or the battery cell described above, and will not be described in detail here.

[0036] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;

[0039] Figure 2 Exploded views of the structure of a single battery cell used in a battery device, provided in some embodiments of this application;

[0040] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0041] Figure 4 This is a schematic diagram of the structure of the casing of a battery cell provided in some embodiments of this application;

[0042] Figure 5 A schematic diagram illustrating the partial structure of the housing and the engagement of the protrusions provided in some embodiments of this application;

[0043] Figure 6 A schematic diagram illustrating the interaction between the battery cell and the protrusion during the assembly of the battery cell into the housing, as provided in some embodiments of this application;

[0044] Figure 7 A schematic diagram illustrating the fit between the battery cell and the protrusion in some embodiments of this application;

[0045] Figure 8 Schematic diagram of the assembly of the protrusion and the fixing plate provided in some embodiments of this application Figure 1 ;

[0046] Figure 9 Schematic diagram of the assembly of the protrusion and the fixing plate provided in some embodiments of this application Figure 2 ;

[0047] Figure 10 A schematic diagram illustrating the engagement of the protrusion and the fixing plate in other embodiments of this application;

[0048] Figure 11 This is a schematic diagram showing the cooperation between the protrusion and the fixing plate in some embodiments of this application.

[0049] Figure label:

[0050] 100 cells per battery

[0051] First direction X, second direction Y, third direction Z,

[0052] Shell 110, first side wall 111, second side wall 112, top wall 113, bottom wall 114

[0053] Pressure relief section 120

[0054] Protrusion 130, contact end 131, through hole 132

[0055] Battery cell 140, fixing plate 150, airflow channel 160, raised layer 170, air passage 171.

[0056] Battery device 200

[0057] Box 210, First Box 210a, Second Box 210b

[0058] Electrical equipment 300. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0061] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0065] In this application, "multiple" means two or more (including two).

[0066] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0067] The battery device mentioned in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells, which can be connected in series, parallel, or mixed connection through a busbar. The battery device generally includes a housing for encapsulating multiple battery cells or multiple battery modules, which can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells; of course, the battery device may also not include a housing.

[0068] For example, a battery cell typically includes a casing, a cell, and an electrolyte. The casing houses the cell and the electrolyte and has at least one positive electrode post and at least one negative electrode post. The cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0069] The positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; alternatively, the battery cell may also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0070] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0071] The pressure relief section on the battery cell mentioned in this application is used to release the gas inside the battery cell when the internal pressure is too high (e.g., due to overcharging), thereby reducing the internal pressure of the battery cell and preventing it from exploding due to excessively rapid pressurization. For example, the pressure relief section can be an explosion-proof valve, an explosion-proof plate, etc.

[0072] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, the battery cells, as core components, have high requirements in terms of both energy density and safety.

[0073] In related technologies, when a battery cell experiences thermal runaway and attempts to release pressure, the gas can easily drive the cell to move, causing the cell to block the pressure relief section. This can prevent the battery cell from effectively releasing pressure and affect its safety.

[0074] Based on the above considerations, in order to improve the effectiveness of venting and depressurizing in a single battery cell, a battery cell is proposed. The battery cell includes a housing, a cell, and a plurality of protrusions. In a first direction, a depressurizing portion is provided on one side of the housing, and the plurality of protrusions are provided on the inner wall of the housing. At least some of the protrusions extend obliquely away from the depressurizing portion relative to the housing in the first direction. The cell is disposed inside the housing, and the plurality of protrusions abut against the cell to at least limit the displacement of the cell in the first direction.

[0075] In the above technical solution, by providing multiple protrusions on the inner wall of the casing that can abut against the battery cell, the displacement of the battery cell in the first direction is restricted. By further extending at least some of the protrusions at an angle relative to the casing in the first direction away from the pressure relief part, the limiting effect of the protrusions on the battery cell is improved. When the battery cell experiences thermal runaway, it helps to prevent the battery cell from moving towards the pressure relief part under the drive of gas, thereby reducing the risk of the battery cell blocking the pressure relief part, improving the effectiveness of opening the pressure relief part, and thus improving the smoothness of gas venting and pressure relief of the battery cell during thermal runaway, thereby improving the safety of the battery cell.

[0076] This application provides an electrical device that uses the battery device or battery cell disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0077] For ease of explanation, the following embodiments use a vehicle as an example to describe in detail the structure of the electrical device 300, battery device 200, and battery cell 100 of this application.

[0078] Please refer to Figure 1 , Figure 1The electrical device 300 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 200, which can be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to supply power to the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device 200 to supply power to the motor, for example, for the vehicle's starting, navigation, and driving power needs. In some embodiments of this application, the battery device 200 can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0079] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery cell 100 used in a battery device 200 according to some embodiments of this application. The battery device 200 includes a housing 210 and a plurality of battery cells 100, which are housed within the housing 210. The housing 210 provides assembly space for the battery cells 100, and the housing 210 can adopt various structures.

[0080] In some embodiments, the housing 210 may include a first housing 210a and a second housing 210b, the first housing 210a and the second housing 210b covering each other, the first housing 210a and the second housing 210b together defining a receiving cavity for accommodating the battery cell 100. The second housing 210b may be a hollow structure open at one end, and the first housing 210a may be a plate-like structure, the first housing 210a covering the open side of the second housing 210b, so that the first housing 210a and the second housing 210b together define the receiving cavity; or, the first housing 210a and the second housing 210b may both be hollow structures open on one side (e.g., Figure 2 As shown), the open side of the first housing 210a closes to the open side of the second housing 210b. Of course, the housing 210 formed by the first housing 210a and the second housing 210b can be of various shapes, such as a cylinder or a cuboid.

[0081] In the battery device 200, multiple battery cells 100 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 100 is housed within the housing 210. Alternatively, the battery device 200 can also be composed of multiple battery cells 100 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 210. The battery device 200 may also include other structures; for example, the battery device 200 may also include a busbar for realizing the electrical connection between the multiple battery cells 100.

[0082] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 100 provided in some embodiments of this application. The battery cell 100 is a cuboid, and the height direction of the battery cell 100 is the first direction X. However, the shape of the battery cell 100 is not limited to this. In other embodiments of this application, the battery cell 100 may also be a polygonal prism, a flat body, or other shapes.

[0083] Please combine Figures 3-7 ,in, Figure 4 This is a schematic diagram of the structure of the housing 110 of the battery cell 100 provided in some embodiments of this application. Figure 5 This is a schematic diagram illustrating the partial structure of the housing 110 and the engagement of the protrusion 130 according to some embodiments of this application. Figure 6 This is a schematic diagram illustrating the interaction between the battery cell 140 and the protrusion 130 during the assembly of the battery cell 140 into the housing 110 according to some embodiments of this application. Figure 7 This is a schematic diagram illustrating the assembly of a battery cell 140 into a housing 110 and its interaction with protrusions 130, according to some embodiments of this application. A battery cell 100 according to an embodiment of this application includes: a housing 110, a battery cell 140, and a plurality of protrusions 130. In a first direction X, a pressure relief portion 120 is provided on one side of the housing 110. The plurality of protrusions 130 are disposed on the inner wall of the housing 110, and at least some of the protrusions 130 extend obliquely away from the pressure relief portion 120 relative to the housing 110 in the first direction X. The battery cell 140 is disposed within the housing 110, and the plurality of protrusions 130 abut against the battery cell 140 to at least limit the displacement of the battery cell 140 in the first direction X.

[0084] In the above technical solution, by providing a plurality of protrusions 130 on the inner wall of the housing 110 that can abut against the battery cell 140, the displacement of the battery cell 140 in the first direction X is restricted. By further making at least a portion of the protrusions 130 extend at an angle relative to the housing 110 in the first direction X toward the direction away from the pressure relief part 120, the limiting effect of the protrusions 130 on the battery cell 140 is improved. When the battery cell 100 experiences thermal runaway, it helps to prevent the battery cell 140 from moving toward the pressure relief part 120 under the drive of gas, thereby reducing the risk of the battery cell 140 blocking the pressure relief part 120, improving the effectiveness of opening the pressure relief part 120, thereby improving the smoothness of the battery cell 100 in venting and depressurizing during thermal runaway, and thus improving the safety of the battery cell 100.

[0085] For example, an installation space is formed inside the housing 110, and the battery cell 140 and multiple protrusions 130 can be disposed in the installation space. At the same time, the pressure relief part 120 is disposed on the housing 110, so that the housing 110 can not only serve as a mounting carrier for the pressure relief part 120, the battery cell 140 and the multiple protrusions 130, but also protect the battery cell 140 and the protrusions 130, reducing the risk of damage to the battery cell 140 and the protrusions 130 due to external impacts.

[0086] In some examples, a plurality of protrusions 130 may be provided on the inner wall of the housing 110 on the side where the pressure relief portion 120 is provided, and the plurality of protrusions 130 may avoid the pressure relief portion 120. At the same time, the plurality of protrusions 130 may abut against the battery cell 140 in the first direction X to limit the displacement of the battery cell 140 in the first direction X. Alternatively, the plurality of protrusions 130 may be provided on the inner wall of the housing 110 that extends at an angle to the first direction X. For example, the pressure relief portion 120 may be provided on the top wall 113 of the housing 110, then the plurality of protrusions 130 may be provided on the peripheral sidewall of the housing 110, and each protrusion 130 as a whole may extend obliquely relative to the housing 110 in the first direction X away from the pressure relief portion 120 to abut against the battery cell 140. Alternatively, the portion of the protrusion 130 near the battery cell 140 may extend relative to the housing 110 in the first direction X away from the pressure relief portion 120.

[0087] When a thermal runaway occurs in a battery cell 100, the temperature of the battery cell 100 rises, and a large amount of gas is generated inside the cell 140. This gas causes the pressure inside the battery cell 100 to increase rapidly. When the pressure inside the battery cell 100 reaches the trigger threshold of the pressure relief section 120, the pressure relief section 120 opens, and the gas inside the casing 110 flows along the first direction X towards the pressure relief section 120 and can be discharged through the pressure relief section 120 to achieve the venting and pressure relief of the battery cell 100.

[0088] In the above process, when gas flows through the cell 140, the gas will generate a driving force on the cell 140. When the cell 140 tends to move towards the pressure relief section 120 along the first direction X under the driving action of the gas, the force exerted by the protrusion 130 on the cell 140 can be decomposed into components along the first direction X and perpendicular to the first direction X. This allows the multiple protrusions 130 to not only restrict the displacement of the cell 140 in the first direction X, but also restrict the displacement of the cell 140 perpendicular to the first direction X. It can also be understood that the protrusions 130 and the cell 140 directly form an interface interlock constraint to resist the driving force of the gas on the cell 140, effectively improve the stability of the cell 140, reduce the risk of the cell 140 moving, thereby reducing the risk of the cell 140 moving to the pressure relief section 120 and blocking the pressure relief section 120, ensuring that the pressure relief section 120 can be effectively opened, improving the smoothness of the venting and pressure relief of the battery cell 100, and thus improving the safety of the battery cell 100.

[0089] It is understood that the above-mentioned arrangement of the multiple protrusions 130 and the method of limiting the battery cell 140 are merely examples for ease of understanding and should not be construed as limitations on this application. The specific arrangement of the multiple protrusions 130 and the method of limiting the battery cell 140 can be determined according to actual production requirements and are not specifically limited here, as long as the multiple protrusions 130 can at least limit the displacement of the battery cell 140 in the first direction X.

[0090] Please refer to Figures 5-7 In some embodiments of this application, the tilt angle of the protrusion 130 relative to the first direction X ranges from 5° to 60°.

[0091] In the above technical solution, by designing the range of the tilt angle of the protrusion 130 relative to the first direction X, it is beneficial to improve the limiting effect of the protrusion 130 on the cell 140 on the one hand, and to reduce the space occupied by the protrusion 130 in the housing 110 on the other hand, so as to increase the space that can be used to arrange the cell 140 in the housing 110, thereby increasing the capacity of the battery cell 100.

[0092] If the tilt angle of the protrusion 130 relative to the first direction X is less than 5°, then the component force of the protrusion 130 acting on the cell 140 perpendicular to the first direction X is small, which easily leads to the failure of the stop between the protrusion 130 and the cell 140. The protrusion 130 is difficult to form an effective interface interlock constraint with the cell 140, which easily leads to the failure of the protrusion 130 to limit the cell 140. The cell 140 is easy to break away from the constraint of the protrusion 130 under the drive of gas and move towards the pressure relief part 120.

[0093] If the tilt angle of the protrusion 130 relative to the first direction X is greater than 60°, the protrusion 130 will occupy a large space in the housing 110. When the space in the housing 110 is limited, the protrusion 130 will encroach on the space used to arrange the battery cell 140, thereby reducing the capacity of the battery cell 100 and affecting the performance of the battery cell 100.

[0094] Please combine Figures 5-7 In some embodiments of this application, the tilt angle of the protrusion 130 relative to the first direction X ranges from 5° to 30°.

[0095] In the above technical solution, by further designing the range of the tilt angle of the protrusion 130 relative to the first direction X, on the one hand, it is beneficial to improve the limiting effect of the protrusion 130 on the cell 140, and on the other hand, it is beneficial to further reduce the space occupied by the protrusion 130 in the housing 110, so as to further increase the space in the housing 110 that can be used to arrange the cell 140, thereby further increasing the capacity of the battery cell 100.

[0096] If the tilt angle of the protrusion 130 relative to the first direction X is less than 5°, then the component force of the protrusion 130 acting on the cell 140 perpendicular to the first direction X is small, which easily leads to the failure of the stop between the protrusion 130 and the cell 140. The protrusion 130 is difficult to form an effective interface interlock constraint with the cell 140, which easily leads to the failure of the protrusion 130 to limit the cell 140. The cell 140 is easy to break away from the constraint of the protrusion 130 and move towards the pressure relief part 120 under the drive of gas.

[0097] If the tilt angle of the protrusion 130 relative to the first direction X is greater than 30°, the protrusion 130 will occupy a large space in the housing 110. When the space in the housing 110 is limited, the protrusion 130 will occupy a lot of space used to arrange the battery cell 140, which will reduce the capacity of the battery cell 100 and affect the performance of the battery cell 100.

[0098] Please combine Figures 7 to 9 ,in, Figure 8 Assembly diagram of the protrusion 130 and the fixing plate 150 provided for some embodiments of this application Figure 1 , Figure 9 Assembly diagram of the protrusion 130 and the fixing plate 150 provided for some embodiments of this application Figure 2 In some embodiments of this application, the end of the protrusion 130 that is away from the housing 110 is a contact end 131, and at least the cross-sectional area of ​​the contact end 131 gradually decreases in the direction away from the housing 110.

[0099] In the above technical solution, by gradually reducing the cross-sectional area of ​​at least the contact end 131 in the direction away from the housing 110, it is beneficial to improve the assembly reliability of the protrusion 130, and at the same time, it is also convenient for the protrusion 130 to deform, so as to reduce the risk of the protrusion 130 damaging the cell 140 and improve the safety of the battery cell 100.

[0100] In some examples, the cross-sectional area of ​​the contact end 131 of the protrusion 130 may gradually decrease in the direction away from the housing 110; in other examples, the cross-sectional area of ​​the protrusion 130 as a whole may gradually decrease in the direction away from the housing 110. The end of the protrusion 130 furthest from the contact end 131 can be used for positioning and mounting the protrusion 130. The contact end 131 is adapted to engage with the battery cell 140. Therefore, the cross-sectional area of ​​the contact end 131 gradually decreases in the direction away from the housing 110. This means that, on the one hand, the end of the protrusion 130 used for positioning and mounting can have a larger contact area, which is beneficial to improving the firmness of the installation of the protrusion 130 and thus improving the assembly reliability of the protrusion 130. On the other hand, when the driving force of the gas on the battery cell 140 is large, the battery cell 140 can passively deform the contact end 131 of the protrusion 130. In this process, part of the driving force generated by the gas on the battery cell 140 can be consumed, effectively reducing the displacement of the battery cell 140 in the first direction X. Furthermore, the contact area between the contact end 131 and the battery cell 140 increases, and the force exerted on the battery cell 140 by the contact end 131 decreases. This helps to reduce the risk of damage to the battery cell 140 due to stress concentration and improves the safety of the battery cell 100.

[0101] In some embodiments of this application, the side wall of the contact end 131 facing the battery cell 140 is formed as a curved surface. For example, the side wall of the contact end 131 facing the battery cell 140 can be formed as an arc surface to prevent the battery cell 140 from being scratched due to the sharp corner formed by the side wall of the contact end 131 facing the battery cell 140, which is beneficial to extending the service life of the battery cell 140.

[0102] In some embodiments of this application, the protrusion 130 is formed as an elastic element.

[0103] In the above technical solution, by making the protrusion 130 an elastic element, firstly, it is beneficial to further reduce the risk of the protrusion 130 damaging the cell 140; secondly, it is beneficial to reduce the assembly difficulty of the protrusion 130 and improve the production and assembly efficiency of the battery cell 100; and thirdly, the protrusion 130 can also absorb vibration, which is beneficial to improve the stability of the battery cell 100 and extend the service life of the battery cell 100.

[0104] Combination Figures 5 to 7In some embodiments of this application, the sidewall of the housing 110 is provided with a plurality of protrusions 130 spaced apart along the first direction X.

[0105] In the above technical solution, by providing a plurality of protrusions 130 spaced apart along the first direction X on the side wall of the housing 110, it is beneficial to improve the limiting effect of the protrusions 130 on the battery cell 140 and improve the stability of the battery cell 140. On the other hand, the plurality of protrusions 130 are beneficial to disperse stress and reduce the risk of damage to a single protrusion 130 due to stress concentration. At the same time, it is beneficial to reduce the risk of damage to the battery cell 140 due to stress concentration at the contact position between the battery cell 140 and the protrusions 130, thereby improving the safety and stability of the battery cell 100 and extending the service life of the battery cell 100.

[0106] For example, the two opposing walls of the housing 110 in the first direction X are defined as the top wall 113 and the bottom wall 114 of the housing 110, respectively. The pressure relief part 120 is provided on the top wall 113 of the housing 110 to facilitate the venting and pressure relief of the battery cell 100, while also helping to reduce the risk of electrolyte leakage.

[0107] The wall surface of the housing 110 connecting the top wall 113 and the bottom wall 114 is defined as the side wall of the housing 110. Multiple protrusions 130 are spaced apart along the first direction X on the side wall of the housing 110 and can work together to abut against the battery cell 140. Compared with the method of limiting the displacement of the battery cell 140 in the first direction X by abutting against the battery cell 140 by a single protrusion 130, the multiple protrusions 130 working together to abut against the battery cell 140 can effectively improve the limiting effect of the protrusions 130 on the battery cell 140, improve the stability of the battery cell 140, improve the uniformity of the force on the battery cell 140, reduce the risk of damage to the battery cell 140 due to stress concentration, and the multiple protrusions 130 can share the force of the battery cell 140 to reduce the risk of damage to a single protrusion 130 due to stress concentration, extend the service life of the battery cell 100, and help improve the safety of the battery cell 100.

[0108] In some embodiments of this application, the distance between two adjacent protrusions 130 in the first direction X ranges from 2mm to 15mm.

[0109] In the above technical solution, by designing the range of the distance between two adjacent protrusions 130 in the first direction X, it is beneficial to reduce the material cost of the battery cell 100, and at the same time, it is beneficial to ensure that the limiting effect of the protrusions 130 on the cell 140 is within a suitable range.

[0110] It should be noted that the specific value of the distance between two adjacent protrusions 130 in the first direction X needs to be determined according to the actual size of the battery cell 100, and is not specifically limited here.

[0111] Combination Figures 5 to 7 In some embodiments of this application, the housing 110 has a plurality of protrusions 130 on at least two oppositely disposed sidewalls.

[0112] In the above technical solution, by providing multiple protrusions 130 on at least two oppositely arranged side walls of the housing 110, it is beneficial to further improve the limiting effect of the protrusions 130 on the battery cell 140, effectively constrain the swing of the battery cell 140, improve the stability of the battery cell 140, improve the safety and stability of the battery cell 100, and extend the service life of the battery cell 100.

[0113] For example, the sidewalls of the housing 110 include two first sidewalls 111 opposite each other along the second direction Y and two second sidewalls 112 opposite each other along the third direction Z, with the second sidewalls 112 connected between the two first sidewalls 111.

[0114] It should be noted that "second direction Y" can be the width direction of battery cell 100, and "third direction Z" can be the thickness direction of battery cell 100. For a detailed diagram of the directions, please refer to [reference needed]. Figure 4 As shown.

[0115] Please refer to Figure 4 In some examples, multiple protrusions 130 are provided on the two opposing first sidewalls 111 to abut against the battery cell 140 on both sides in the second direction Y, thereby improving the limiting effect of the protrusions 130 on the battery cell 140 and reducing the risk of the battery cell 140 swaying due to the unbalanced force on both sides in the second direction Y, thus improving the stability of the battery cell 140.

[0116] In other examples, each of the two opposing second sidewalls 112 is provided with a plurality of protrusions 130, which respectively engage with the battery cell 140 on both sides in the third direction Z, thereby improving the limiting effect of the protrusions 130 on the battery cell 140 and helping to reduce the risk of the battery cell 140 swaying due to the unbalanced force on both sides of the battery cell 140 in the third direction Z, thus improving the stability of the battery cell 140.

[0117] In some other examples, multiple protrusions 130 are provided on both first sidewalls 111 and both second sidewalls 112 to limit the displacement of the battery cell 140 along the first direction X, while limiting the battery cell 140 in the circumferential direction, which helps to further improve the stability of the battery cell 140.

[0118] It is understandable that the arrangement of the protrusions 130 on the housing 110 can be determined according to actual production requirements, and no specific limitation is made here.

[0119] Please combine Figures 5 to 7 In some embodiments of this application, the sidewalls of the housing 110 and the bottom wall 114 of the housing 110 together enclose an open mounting space. When assembling the battery cell 100, the battery cell 140 can be installed into the mounting space through the open end along the first direction X. During this process, the battery cell 140 can sequentially engage with a plurality of protrusions 130 arranged along the first direction X, and the protrusions 130 further extend obliquely along the first direction X in a direction away from the pressure relief portion 120. In other words, before the battery cell 140 is installed into the housing 110, the protrusions 130... The tilt angle relative to the first direction X ranges from 5° to 60°. After the cell 140 is installed in the housing 110, the tilt angle of the protrusion 130 relative to the first direction X ranges from 5° to 30°. This improves the limiting effect of the protrusion 130 on the cell 140, while also allowing the protrusion 130 to avoid the cell 140 during installation, reducing the space occupied by the protrusion 130 in the housing 110. This increases the space available for arranging the cell 140 in the housing 110, thereby increasing the capacity of the battery cell 100.

[0120] Please refer to Figure 9 In some embodiments of this application, the protrusion height of each protrusion 130 ranges from 0.3mm to 3mm.

[0121] In the above technical solution, by designing the range of protrusion height of each protrusion 130, on the one hand, it is beneficial to improve the assembly convenience of the battery cell 140, reduce the risk of damage to the protrusion 130, and also reduce the space occupied by the protrusion 130 in the housing 110, thereby increasing the capacity of the battery cell 100. On the other hand, it is also beneficial to improve the limiting effect of the protrusion 130 on the battery cell 140, and reduce the risk of the battery cell 140 detaching from the protrusion 130.

[0122] For example, the dimension of each protrusion 130 in the direction perpendicular to the first direction X is defined as the protrusion height L of the protrusion 130, where 0.3mm ≤ L ≤ 3mm. If L < 0.3mm, the protrusion height of the protrusion 130 is too small, resulting in a small engagement depth with the battery cell 140. This means the force required for the battery cell 140 to disengage from the protrusion 130 is small, making it easy for the battery cell 140 to loosen from the protrusion 130. Consequently, the limiting effect of the protrusion 130 on the battery cell 140 in the first direction X is poor. During the assembly of the battery cell 140 into the housing 110, the battery cell 140 will interact with the protrusion 130... If the resistance is too great and L > 3mm, the protrusion 130 will exert too much resistance on the cell 140 when it is assembled into the housing 110, making it difficult to install the cell 140. This may even cause damage to the cell 140 or the protrusion 130 during assembly. At the same time, since the protrusion height of the protrusion 130 affects the space occupied by the protrusion 130 in the housing 110, if the installation space is limited, L > 3mm will cause the protrusion 130 to excessively encroach on the space used to arrange the cell 140, resulting in a small capacity of the battery cell 100 and affecting the performance of the battery cell 100.

[0123] Combination Figures 5 to 11 ,in, Figure 10 This is a schematic diagram illustrating the engagement between the protrusion 130 and the fixing plate 150 according to other embodiments of this application. Figure 11 This is a schematic diagram illustrating the cooperation between the protrusion 130 and the fixing plate 150 in some embodiments of this application. In some embodiments of this application, the battery cell 100 further includes a fixing plate 150, which is fixed to the inner wall of the housing 110. The fixing plate 150 is provided with a plurality of protrusions 130, and each protrusion 130 is fixed to the housing 110 by a corresponding fixing plate 150.

[0124] In the above technical solution, by setting the fixing plate 150, it is convenient to realize the modular assembly of multiple protrusions 130, improve the assembly convenience of multiple protrusions 130, and help reduce the assembly difficulty of multiple protrusions 130, thereby helping to improve the production assembly efficiency of battery cell 100.

[0125] For example, multiple protrusions 130 provided on one side of the battery cell 140 can be assembled using the same fixing plate 150. That is, the multiple protrusions 130 on one side of the battery cell 140 and the fixing plate 150 for mounting the multiple protrusions 130 can form a module. When assembling the battery cell 100, the multiple protrusions 130 and the corresponding fixing plate 150 can be pre-installed to form a module, and then the module formed by the multiple protrusions 130 and the fixing plate 150 is installed as a whole into the housing 110. This enables modular assembly of the multiple protrusions 130. Compared with installing the multiple protrusions 130 one by one onto the housing 110, the assembly difficulty of the multiple protrusions 130 can be effectively reduced, the assembly convenience of the multiple protrusions 130 can be improved, and thus the production assembly efficiency of the battery cell 100 can be improved.

[0126] In some specific embodiments of this application, the fixing plate 150 and the plurality of protrusions 130 can be formed as an integral part, which can be made of polymer composite material (such as polyimide material or carbon fiber composite material, etc.), and the fixing plate 150 and the plurality of protrusions 130 can be constructed by laser engraving or injection molding process respectively.

[0127] The above technical solution not only simplifies the assembly steps of the battery cell 100 and improves the assembly efficiency of the battery cell 100, but also improves the high temperature resistance of the fixing plate 150 and multiple protrusions 130 by designing the material of the integrated component, thereby reducing the risk of damage to the fixing plate 150 and protrusions 130 under high temperature conditions.

[0128] It is understandable that the specific materials constituting the fixing plate 150 and the multiple protrusions 130 can be determined according to actual production requirements, and no specific limitations are made here.

[0129] In some embodiments of this application, the fixing plate 150 and the housing 110 can be bonded and fixed by a high-temperature resistant adhesive (e.g., a two-component epoxy resin with a temperature resistance range of -50℃ to 300℃). The shear strength of the high-temperature resistant adhesive can reach more than 12 MPa, and it can withstand 1,500 thermal cycles in a temperature range of -20℃ to 120℃ without falling off. This effectively improves the connection reliability between the fixing plate 150 and the housing 110 under high-temperature conditions and reduces the risk of the fixing plate 150 and the protrusion 130 falling off from the housing 110.

[0130] It is understandable that the fixing plate 150 and the housing 110 can also be fixed in other ways. The specific method can be determined according to the actual production requirements, and no specific limitation is made here.

[0131] The following are the relevant data obtained from the experimental tests using the aforementioned battery cell 100 as a sample.

[0132] When the internal gas production rate of the battery cell 100 exceeds the critical value of 0.5 L / s, the gas flows through the gap extending in the first direction X between the protrusion 130 and the casing 110 at a speed of 0.8 m / s-1.2 m / s, forming a jet effect and generating dynamic negative pressure using Bernoulli's principle. At this time, the protrusion 130 forms an angle of 15°-30° with the gas flow direction, causing the reverse friction force between the protrusion 130 and the cell 140 to increase to 1.5 N / cm²-2.0 N / cm² within 0.3 seconds, triggering the self-locking effect. When the gas production rate reaches 2 L / s, the self-locking force can be increased to 3.2 N / cm².

[0133] The protrusion 130 can control the displacement of the battery cell 140 along the first direction X within a range of ±0.6mm. Furthermore, the arrangement of multiple protrusions 130 can also form a mechanical anchor through stress concentration at the contact end 131 (maximum local stress up to 450MPa) when the air pressure reaches 0.3MPa, effectively preventing the displacement of the battery cell 140 along the first direction X caused by the air pressure difference.

[0134] In addition, the fixing plate 150 can still maintain more than 75% of its bonding strength at a high temperature of 200℃, which significantly improves the thermal stability of the battery system.

[0135] Therefore, based on the relevant data obtained from the above experimental tests, it can be seen that the battery cell 100 of this application can effectively suppress the movement of the cell 140 along the first direction X, improve the stability of the cell 140, and increase the self-locking force as the gas production rate increases, effectively reducing the risk of the protrusion 130 failing to limit the cell 140 due to the cell 140 separating from the protrusion 130.

[0136] Combination Figure 10 and Figure 11 In some embodiments of this application, an airflow channel 160 extending at least along a first direction X is provided between the housing 110 and the battery cell 140.

[0137] In the above technical solution, by providing an airflow channel 160 extending at least along the first direction X between the casing 110 and the cell 140, the airflow generated when the battery cell 100 experiences thermal runaway is guided, effectively improving the smoothness and orderliness of the airflow. This facilitates the acceleration of gas discharge from the casing 110, reducing the risk of the casing 110 exploding. It also helps reduce heat transfer from the thermally runaway battery cell 100 to surrounding battery cells 100, suppressing the spread of thermal runaway. Furthermore, it helps reduce the impact of gas on the cell 140, reducing the force on the cell 140, thereby reducing the risk of the cell 140 moving toward the pressure relief section 120.

[0138] For example, when the battery cell 100 experiences thermal runaway, gas is generated in the bottom region of the cell 140 and accumulates at the top. That is, the gas flows in the housing 110 in the direction of the first direction X toward the pressure relief part 120. During this process, the gas impacts the cell 140, and this impact force causes the cell 140 to tend to move toward the pressure relief part 120 along the first direction X. This application provides an airflow channel 160 extending at least along the first direction X between the housing 110 and the cell 140, which allows the gas generated by the cell 140 to flow efficiently and orderly toward the pressure relief part 120 through the airflow channel 160, thereby improving the efficiency of gas discharge and reducing the risk of the housing 110 exploding. At the same time, it can disperse and reduce the impact force of the gas on the cell 140, that is, reduce the driving force of the gas on the cell 140, thereby reducing the risk of the cell 140 moving toward the pressure relief part 120 driven by the gas.

[0139] Meanwhile, since the gas can be quickly discharged through the pressure relief section 120, the risk of the temperature of the battery cell 100 rapidly rising due to the accumulation of high-temperature gas in the casing 110 can be effectively reduced. This helps to reduce the risk of the battery cell 100 heating the adjacent battery cells 100 and suppress the spread of thermal runaway.

[0140] In some examples, an airflow channel 160 extending along the first direction X can be separately provided between the housing 110 and the cell 140 to simplify the processing steps of the battery cell 100 and improve the production efficiency of the battery cell 100. In other examples, while providing an airflow channel 160 extending along the first direction X between the housing 110 and the cell 140, an airflow channel 160 extending along the second direction Y or the third direction Z, which is connected to the airflow channel 160 extending along the first direction X, can also be provided to further improve the orderliness of gas flow.

[0141] The airflow channel 160 can be defined by the housing 110 and the battery cell 140. For example, the housing 110 can have a groove structure that is recessed away from the battery cell 140 so that the housing 110 and the battery cell 140 can jointly define the airflow channel 160. In other examples, the airflow channel 160 can be defined by a plurality of protrusions 130, or the airflow channel 160 can be defined by a plurality of protrusions 130 and a fixing plate 150.

[0142] It is understood that the above-described method of forming the airflow channel 160 is merely an example for ease of understanding and should not be construed as a limitation of this application. The specific method of forming the airflow channel 160 can be determined according to actual production requirements and is not specifically limited here.

[0143] Please refer to Figure 10In some embodiments of this application, the inner wall of the housing 110 is provided with a plurality of protrusions 130 spaced apart along the first direction X, each protrusion 130 is provided with a through hole 132, and the plurality of through holes 132 arranged in the first direction X define an airflow channel 160.

[0144] In the above technical solution, by providing a through hole 132 for each protrusion 130, a plurality of through holes 132 arranged in the first direction X define an airflow channel 160. On the one hand, it can guide the airflow generated when the battery cell 100 experiences thermal runaway, effectively improving the smoothness and orderliness of airflow. On the other hand, it also helps to reduce the risk of electrolyte leakage and improve the safety of the battery cell 100.

[0145] For example, each protrusion 130 is provided with a through hole 132 extending through the protrusion 130 along the thickness direction of the protrusion 130. The multiple through holes 132 arranged in the first direction X define an airflow channel 160 for gas flow. When the battery cell 100 experiences thermal runaway, the gas generated in the bottom region of the cell 140 can flow to the pressure relief part 120 through the airflow channel 160, thereby improving the orderliness and smoothness of the battery gas flow and improving the efficiency of gas discharge. At the same time, since it is not necessary to process the groove structure for defining the airflow channel 160 on the housing 110, it is beneficial to improve the strength of the housing 110, reduce the risk of electrolyte leakage due to cracking of the housing 110, and improve the safety of the battery cell 100.

[0146] In some examples, the multiple through holes 132 can be arranged opposite each other in the first direction X to improve the smoothness of the airflow channel 160, thereby improving the smoothness of gas discharge; in other embodiments, the multiple through holes 132 can be staggered in the first direction X, which helps to reduce the assembly accuracy requirements of the multiple protrusions 130 and improve the production assembly efficiency of the battery cell 100.

[0147] It is understandable that the specific arrangement of multiple through holes 132 can be determined according to actual production requirements, and no specific limitation is made here.

[0148] In some specific embodiments, each protrusion 130 is provided with two spaced through holes 132. The distance between the two through holes 132 on each protrusion 130 can be the same as the distance between two adjacent protrusions 130 in the first direction X, and the diameter of each through hole 132 can be set to 0.1mm-2mm.

[0149] Through testing the battery cell 100 of this embodiment, the following data was obtained: when the gas production rate reaches 2.5L / s, the gas flow rate through the through hole 132 can reach 1.5m / s, which acts on the cell 140 and reduces the upward impact force by 45%.

[0150] It can be seen that by further providing through holes 132 on the protrusion 130, not only can the limiting function of the protrusion 130 on the battery cell 140 be maintained, but the impact of gas on the battery cell 140 can also be reduced, which is beneficial to further suppress the movement of the battery cell 140 along the first direction X.

[0151] Please refer to Figure 11 In some embodiments of this application, the inner wall of the housing 110 is provided with multiple layers of raised layers 170 spaced apart in the first direction X. Each raised layer 170 includes at least two spaced protrusions 130. An air passage 171 is defined between the spaced protrusions 130 of each raised layer 170, and the air passage 171 of the multiple raised layers 170 defines an airflow passage 160.

[0152] In the above technical solution, by defining an air passage 171 between the spaced protrusions 130 of each protrusion layer 170, and defining an airflow passage 160 by the air passage 171 of the multiple protrusion layers 170, firstly, the airflow generated when the battery cell 100 experiences thermal runaway can be guided, effectively improving the smoothness and orderliness of the airflow; secondly, it reduces the risk of electrolyte leakage and improves the safety of the battery cell 100; and thirdly, it simplifies the processing steps of the airflow passage 160, reduces the processing difficulty and cost of the airflow passage 160, and improves production efficiency.

[0153] For ease of description, the example given is that the first sidewall 111 of the housing 110 has multiple raised layers 170. The multiple raised layers 170 are spaced apart in the first direction X. Each raised layer 170 includes at least two raised portions 130 spaced apart in the third direction Z. An air passage 171 is defined between two adjacent raised portions 130. The air passages 171 of the multiple raised layers 170 are connected and define an airflow passage 160.

[0154] When the battery cell 100 experiences thermal runaway, the gas generated in the bottom region of the cell 140 can flow sequentially through multiple gas passages 171 arranged along the first direction X. That is, the gas can flow through the gas flow channel 160 to the pressure relief section 120, thereby improving the orderliness and smoothness of the battery gas flow and improving the efficiency of gas discharge. At the same time, since there is no need to process the groove structure on the housing 110 to define the gas flow channel 160, it is beneficial to improve the strength of the housing 110, reduce the risk of electrolyte leakage due to cracking of the housing 110, and improve the safety of the battery cell 100. In addition, since there is no need to process additional structures on the protrusion 130 to form the gas flow channel 160, the processing steps of the gas flow channel 160 can be effectively simplified, reducing the processing difficulty and cost of the gas flow channel 160 and improving production efficiency.

[0155] In some embodiments of this application, the spacing between adjacent protrusions 130 of each protrusion layer 170 is in the range of 2mm-5mm, that is, the width of each air passage 171 is in the range of 2mm-5mm.

[0156] In the above technical solution, by designing the range of values ​​for the width of the gas passage 171, on the one hand, the smoothness of gas discharge can be improved and the resistance generated by the gas passage 171 to the gas can be reduced. On the other hand, the guiding effect of the airflow passage 160 formed by the gas passage 171 on the gas can be reduced due to the excessive width of the gas passage 171, thereby improving the orderliness of gas flow and thus improving the efficiency of gas discharge.

[0157] Through testing experiments on the battery cell 100 of this embodiment, when the gas generation rate reaches 2.5L / s, the upward impact force of the gas on the cell 140 is reduced by more than 55%. It can be seen that by forming an air passage 171 between adjacent protrusions 130 of the protrusion layer 170, not only can the limiting function of the protrusions 130 on the cell 140 be maintained, but the impact of the gas on the cell 140 can also be reduced, which is beneficial to further suppress the movement of the cell 140 along the first direction X.

[0158] Please refer to Figure 2 The battery device 200 according to the embodiments of this application includes a plurality of battery cells 100, each battery cell 100 being the aforementioned battery cell 100.

[0159] In the above technical solution, since the battery device 200 uses the aforementioned battery cell 100, the safety of the battery device 200 can be effectively improved.

[0160] Please refer to Figure 1 The electrical device 300 according to the embodiments of this application includes the battery device 200 described above or the battery cell 100 described above.

[0161] In the above technical solution, since the power-consuming device 300 adopts the battery device 200 or the battery cell 100, the safety of the power-consuming device 300 can be effectively improved.

[0162] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0163] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing, in the first direction, has a pressure relief section on one side; Multiple protrusions are provided on the inner wall of the housing, and at least a portion of the protrusions extend obliquely away from the pressure relief portion in the first direction relative to the housing. A battery cell disposed within the housing, wherein a plurality of protrusions abut against the battery cell to at least limit the displacement of the battery cell in the first direction.

2. The battery cell according to claim 1, characterized in that, The angle of inclination of the protrusion relative to the first direction ranges from 5° to 60°.

3. The battery cell according to claim 2, characterized in that, The angle of inclination of the protrusion relative to the first direction ranges from 5° to 30°.

4. The battery cell according to claim 1, characterized in that, The end of the protrusion away from the housing is a contact end, and at least the cross-sectional area of ​​the contact end gradually decreases in the direction away from the housing.

5. The battery cell according to claim 1, characterized in that, The protrusion is formed as an elastic element.

6. The battery cell according to claim 1, characterized in that, The sidewall of the housing is provided with a plurality of protrusions spaced apart along a first direction.

7. The battery cell according to claim 6, characterized in that, The housing has a plurality of protrusions on at least two opposite sidewalls.

8. The battery cell according to claim 1, characterized in that, The protrusion height of each protrusion ranges from 0.3mm to 3mm.

9. The battery cell according to claim 1, characterized in that, It also includes a fixing plate, which is fixed to the inner wall of the housing. The fixing plate is provided with a plurality of protrusions, and each protrusion is fixed to the housing by a corresponding fixing plate.

10. The battery cell according to any one of claims 1-9, characterized in that, An airflow channel extending at least along the first direction is provided between the housing and the battery cell.

11. The battery cell according to claim 10, characterized in that, The inner wall of the housing is provided with a plurality of protrusions spaced apart along a first direction, each of the protrusions being provided with a through hole, and the plurality of through holes arranged in the first direction defining the airflow channel.

12. The battery cell according to claim 11, characterized in that, The inner wall of the housing is provided with multiple layers of protrusions spaced apart in a first direction. Each layer of the protrusions includes at least two spaced protrusions. An air passage is defined between the spaced protrusions in each layer of the protrusions. The air passages of the multiple layers of the protrusions define the airflow passage.

13. A battery device, characterized in that, It includes multiple battery cells, each of which is a battery cell according to any one of claims 1-12.

14. An electrical appliance, characterized in that, It includes the battery device according to claim 13, or the battery cell according to any one of claims 1-12.

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