Battery monomer, battery with battery monomer and electric equipment

Abstract

The invention discloses a single battery, a battery with the single battery and electric equipment, the single battery comprises a shell, the shell is provided with a containing cavity, the containing cavity is provided with a first wall and a second wall which are oppositely arranged in a first direction, and the first wall is provided with an anti-explosion valve; the air guide plate is arranged in the containing cavity and located between the first wall and the second wall, the air guide plate is provided with an air guide channel and a vent hole, the air guide channel extends in the first direction, and the air guide channel communicates with the portion, outside the air guide channel, of the containing cavity through the vent hole. According to the battery monomer disclosed by the invention, the gas generated in the circulation process of the battery monomer has a relatively large discharge space, the exhaust effect is improved, and the internal pressure of the battery monomer is reduced, so that the occurrence probability of thermal runaway of the battery monomer and the risk of shell welding seam cracking caused by overlarge pressure can be reduced; and meanwhile, the moving direction of the gas can be limited, and the gas generated in the circulating process of the battery monomers can be guided, so that the gas can be smoothly exhausted, and the exhausting effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell and a battery and electrical equipment having the same. Background Art

[0002] Relevant technologies point out that ultra-thin diaphragms are currently used in the production of battery cells. The use of ultra-thin diaphragms reduces the volume of electrode assemblies, reduces group margin, and increases energy density, thereby creating space for increasing the capacity of electrode assemblies. As the capacity of electrode assemblies increases, the gas production of battery cells also increases, and the probability of thermal runaway of battery cells and the risk of shell weld cracking due to excessive pressure also increase. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery cell, which can allow the gas generated by the battery cell during the cycle to have a larger discharge space, reduce the probability of thermal runaway of the battery cell and the risk of shell weld cracking caused by excessive pressure; at the same time, it can also limit the movement direction of the gas, guide the gas generated during the cycle of the battery cell, so that it can be discharged smoothly, and increase the exhaust effect.

[0004] The present invention also provides a battery having the battery cell.

[0005] The present invention also provides an electrical device having the battery.

[0006] A battery cell according to a first aspect of the present invention comprises: a shell having a accommodating cavity, the accommodating cavity having a first wall and a second wall arranged opposite to each other in a first direction, the first wall being provided with an explosion-proof valve; an air guide plate, the air guide plate being arranged in the accommodating cavity and between the first wall and the second wall, the air guide plate having an air guide channel and an air vent, the air guide channel extending along the first direction, the air guide channel being connected to the accommodating cavity outside the air guide channel through the air vent.

[0007] According to the battery cell of the present invention, by providing an air guide plate, the gas generated by the battery cell during the cycle process can have a larger discharge space, thereby increasing the exhaust effect, and further reducing the internal pressure of the battery cell, thereby reducing the probability of thermal runaway of the battery cell and the risk of shell weld cracking due to excessive pressure; at the same time, the movement direction of the gas can also be limited, and the gas generated by the battery cell during the cycle process can be guided so that it can be discharged smoothly, thereby increasing the exhaust effect.

[0008] In some embodiments, the first wall is the top wall of the accommodating cavity, and the explosion-proof valve is disposed on the first wall of the shell.

[0009] This embodiment, by arranging the explosion-proof valve on the top wall of the accommodating chamber, is conducive to ensuring the exhaust space at the position of the explosion-proof valve, so that the gas in the accommodating chamber can be discharged smoothly, thereby reducing the internal pressure of the battery cell, reducing the probability of thermal runaway of the battery cell and the risk of shell weld cracking caused by excessive pressure.

[0010] In some embodiments, an electrode assembly is disposed in the accommodating cavity, and the air guide plate is disposed between a side wall of the accommodating cavity and the electrode assembly.

[0011] This embodiment arranges an air guide plate between the side wall of the accommodating cavity and the electrode assembly, which can reduce damage to the electrode assembly or the air guide plate caused by mutual squeezing between the air guide plate and the electrode assembly. At the same time, it can also effectively reduce the probability of blockage of the air guide channel, thereby ensuring the exhaust space and increasing the exhaust effect.

[0012] In some embodiments, there are multiple air guide plates, and the multiple air guide plates are arranged along the circumference of the accommodating cavity.

[0013] In this embodiment, a plurality of air guide plates are provided, and the plurality of air guide plates are arranged along the circumference of the accommodating cavity, so that the exhaust effect of the battery cell can be improved, the probability of thermal runaway of the battery cell can be effectively reduced, and the reliability of the battery cell can be improved.

[0014] In some embodiments, the accommodating cavity has a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged relative to each other in a second direction in a horizontal plane, the third side wall and the fourth side wall are arranged relative to each other in a third direction in a horizontal plane, the first direction, the second direction and the third direction are perpendicular to each other, wherein the air guide plate is provided between the first side wall and the second side wall and the electrode assembly, and / or the air guide plate is provided between the third side wall and the fourth side wall and the electrode assembly.

[0015] This embodiment arranges the air guide plate between the first side wall and the second side wall and the electrode assembly or between the third side wall and the fourth side wall and the electrode assembly, so as to achieve smooth exhaust and improve the energy density of the battery cell. The air guide plate is arranged between the first side wall, the second side wall, the third side wall and the fourth side wall and the electrode assembly, so as to increase the space of the air guide channel, greatly increase the exhaust space, increase the exhaust effect, and further reduce the pressure inside the battery cell, thereby reducing the probability of thermal runaway of the battery cell and the risk of cracking of the shell weld caused by excessive pressure.

[0016] In some embodiments, in a first direction, the air guide plate extends from the second wall of the accommodating cavity to the first wall of the accommodating cavity.

[0017] In this embodiment, an air guide plate is arranged in a first direction to extend from the second wall of the accommodating cavity to the first wall of the accommodating cavity, so that the gas generated inside the battery cell can be guided to the explosion-proof valve, and then the gas is discharged to the outside of the battery cell, thereby effectively reducing the occurrence of thermal runaway of the battery cell.

[0018] In some embodiments, the distance between the air guide plate and the second wall of the accommodating cavity is less than or equal to 10 mm; and / or the distance between the air guide plate and the first wall of the accommodating cavity is less than or equal to 10 mm.

[0019] In this embodiment, by setting the distance between the air guide plate and the second wall and the first wall of the accommodating cavity to be less than or equal to 10 mm, the probability of exhaust failure of the air guide plate can be effectively reduced, the exhaust effect can be improved, and the probability of thermal runaway of the battery cell can be reduced.

[0020] In some embodiments, the air guide plate has a first edge and a second edge arranged relative to each other in a second direction in a horizontal plane, the second direction is perpendicular to the first direction and to the thickness direction of the air guide plate, the accommodating cavity has a first side wall and a second side wall arranged relative to each other in the second direction, the first edge is arranged toward the first side wall, and the second edge is arranged toward the second side wall, wherein the spacing between the first edge and the first side wall in the second direction is less than or equal to 10 mm; and / or the spacing between the second edge and the second side wall in the second direction is less than or equal to 10 mm.

[0021] In this embodiment, by setting the spacing between the first edge and the first side wall in the second direction to be less than or equal to 10 mm, and the spacing between the second edge and the second side wall in the second direction to be less than or equal to 10 mm, the probability of exhaust failure of the air guide plate can be effectively reduced, the exhaust effect can be improved, and the probability of thermal runaway of the battery cell can be reduced.

[0022] In some embodiments, the air guide plate includes: a plate body and a plurality of support ribs, the plate body extending along the first direction, the support ribs being connected to a side of the side wall of the plate body facing the accommodating cavity, the support ribs extending along the first direction, a plurality of the support ribs being arranged at intervals in a second direction, the second direction being perpendicular to the first direction and perpendicular to a thickness direction of the air guide plate, the support ribs, the plate body and the side wall of the accommodating cavity cooperating to define the air guide channel.

[0023] By providing a plate body and a plurality of supporting ribs, this embodiment can increase the contact area between the air guide plate and the electrode assembly, thereby effectively preventing damage to the electrode assembly or the air guide plate caused by the expansion and squeezing of the electrode assembly, thereby improving the reliability of the battery cell; at the same time, it can also increase the structural strength of the air guide plate, thereby reducing the probability of deformation of the air guide plate, thereby reducing the probability of thermal runaway of the battery cell due to a blocked exhaust path.

[0024] In some embodiments, the vent hole is formed on the plate body and penetrates the plate body along the thickness direction of the plate body, and the vent hole is formed between two adjacent supporting ribs.

[0025] By providing the vent holes in this embodiment, the gas generated during the battery cell cycle can enter the air guide channel along the vent holes and be discharged to the outside of the battery cell through the air guide channel, thereby achieving the exhaust work of the air guide plate.

[0026] In some embodiments, there are multiple ventilation holes, and the multiple ventilation holes are arranged at intervals along the length direction and width direction of the plate body.

[0027] In this embodiment, a plurality of vent holes are provided and spaced apart in the length and width directions of the plate body. In this way, the total opening area of ​​the vent holes can be effectively increased so that the area of ​​the vent holes can meet the exhaust demand. At the same time, the gas in the accommodating cavity can enter the air guide channel through the vent holes at different positions, thereby increasing the exhaust effect and improving the exhaust efficiency.

[0028] In some embodiments, the ventilation holes are circular holes, elliptical holes or polygonal holes.

[0029] In this embodiment, the ventilation holes are arranged to be circular holes, elliptical holes or polygonal holes, so that the difficulty of manufacturing the air guide plate can be reduced and the manufacturing speed of the air guide plate can be increased.

[0030] In some embodiments, in a projection plane perpendicular to the thickness direction of the plate body, a ratio of a projection area of ​​the plurality of ventilation holes to a projection area of ​​the plate body is 0.3-0.7.

[0031] In this embodiment, by setting the ratio of the projected area of ​​the multiple ventilation holes to the projected area of ​​the plate body to 0.3-0.7, the area occupied by the multiple ventilation holes on the plate body can be not too large, which is beneficial to improving the structural strength and stability of the plate body. At the same time, it can also improve the plate body's limiting and gas guiding functions for the gas entering the gas guide channel, so that the gas can be smoothly discharged along the gas guide channel; it can also ensure that the area occupied by the ventilation holes on the plate body is not too small, so that the area of ​​the ventilation holes can meet the exhaust requirements, thereby improving the exhaust effect, and further reducing the probability of thermal runaway of the battery cell.

[0032] In some embodiments, in the second direction, among the plurality of support ribs, two support ribs located on both sides of the air guide plate in the second direction are respectively flush with both side edges of the plate body in the second direction.

[0033] In this embodiment, two support ribs located on both sides of the air guide plate in the second direction are respectively flush with the edges of the plate body on both sides in the second direction, thereby increasing the exhaust space of the air guide channel and effectively improving the smoothness of exhaust.

[0034] In some embodiments, in the thickness direction of the plate body, the thickness of the support ribs is 2 mm-4 mm.

[0035] In this embodiment, by setting the thickness of the support ribs to 2mm-4mm in the thickness direction of the plate, the gas discharge space can be increased without affecting the energy density of the battery cell, so that the gas in the battery cell cycle process can be discharged in time, and the internal pressure of the battery cell can be reduced, thereby reducing the probability of thermal runaway of the battery cell and improving the reliability and service life of the battery cell.

[0036] In some embodiments, the support ribs are integrally formed with the plate body, or the support ribs and the plate body are separate parts, and the support ribs are connected to the plate body by hot melt.

[0037] In this embodiment, the supporting ribs are integrally formed with the plate body, which can simplify the production steps of the air guide plate, thereby increasing the production rate of the air guide plate and reducing the production cost of the air guide plate. By providing the supporting ribs and the plate body as separate parts, and the supporting ribs and the plate body are hot-melt connected, the process complexity of the air guide plate can be reduced, the mold opening cost can be reduced, and the production cost of the air guide plate can be reduced.

[0038] In some embodiments, the air guide plate is a polypropylene piece.

[0039] In this embodiment, by setting the air guide plate to be a polypropylene member, the possibility of the air guide plate being corroded or crushed by the electrolyte can be reduced, thereby improving the reliability and service life of the air guide plate, and at the same time, the production cost of the air guide plate can be reduced.

[0040] A battery according to a second aspect of the present invention comprises a battery cell according to the first aspect of the present invention.

[0041] According to the battery of the present invention, the battery cell of the first aspect is provided, thereby improving the overall performance of the battery.

[0042] An electric device according to a third aspect of the present invention comprises a battery according to the second aspect of the present invention.

[0043] According to the electric device of the present invention, the battery of the second aspect is provided, thereby improving the overall performance of the electric device.

[0044] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present invention;

[0046] Figure 2 is a schematic diagram of a battery according to an embodiment of the present invention;

[0047] Figure 3 is an exploded diagram of a battery according to an embodiment of the present invention;

[0048] Figure 4 is an exploded view of a battery cell according to an embodiment of the present invention;

[0049] Figure 5 is a schematic diagram of a battery cell according to an embodiment of the present invention;

[0050] Figure 6 yes Figure 4 A schematic diagram of the air guide plate shown in ;

[0051] Figure 7 yes Figure 4 A schematic diagram of another angle of the air guide plate shown in ;

[0052] Figure 8 yes Figure 4 A schematic diagram of the air guide plate shown in another angle;

[0053] Fig. 9 is a schematic diagram of a battery cell according to another angle of the embodiment of the present invention;

[0054] Fig.10 is along Fig. 9 A cross-sectional view of the line AA shown in FIG.

[0055] Fig.11 yes Fig. 9 An enlarged view of the circled area A.

[0056] Reference numerals:

[0057] 1. Vehicles;

[0058] 1000. Battery;

[0059] 100. Battery cell;

[0060] 10. housing; 11. accommodating chamber;

[0061] 20. air guide plate; 21. plate body; 22. supporting ribs; 23. vent holes;

[0062] 30. Electrode assembly;

[0063] 40. end cover; 50. adapter;

[0064] 200, box body; 201, main box; 202, cover plate;

[0065] 2000, controller; 3000, motor. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0069] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the description of the embodiments of the present invention, the term "plurality" refers to more than two (including two).

[0072] In the description of the embodiments of the present invention, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention.

[0073] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0074] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0075] Ultra-thin diaphragms are currently introduced in the production of battery cells. The use of ultra-thin diaphragms reduces the volume of electrode assemblies, reduces group margin, and increases energy density, thereby creating room for increasing the capacity of electrode assemblies. As the capacity of electrode assemblies increases, the gas production of battery cells also increases, and the probability of thermal runaway of battery cells and the risk of shell weld cracking due to excessive pressure also increase.

[0076] In order to solve the problems of thermal runaway and shell weld cracking caused by excessive internal pressure in the battery cell during the cycle, research has found that a gas guide channel can be added inside the shell of the battery cell to ensure the exhaust space for the gas so that the gas can be discharged smoothly, thereby reducing the internal pressure of the battery cell and reducing the occurrence of thermal runaway.

[0077] Based on the above considerations, in order to solve the problems of thermal runaway and shell weld cracking caused by excessive internal pressure in the battery cell during recycling, a battery cell is designed. An air guide plate is arranged in the accommodating cavity, and the air guide plate has an air guide channel and a vent. In this way, the air guide channel defined by the air guide plate itself, or the air guide channel defined by the air guide plate and the shell of the battery cell, can be used to increase the exhaust space of the gas, guide the direction of the gas, and ensure that the gas is quickly discharged to the explosion-proof valve position of the battery cell. As a result, the gas generated by the battery cell can have a larger discharge space, and the airflow in the battery cell cycle process can be quickly discharged, thereby quickly reducing the internal pressure of the battery cell and reducing the probability of thermal runaway.

[0078] When the battery is recycled, since the air guide channel and the air vents are formed on the air guide plate, and the air vents are used to connect the air guide channel and the accommodating cavity, when a large amount of gas is generated inside the battery cell, the gas can enter the air guide channel through the air vents, and then be drained through the air guide channel to the explosion-proof valve for discharge. Therefore, the air guide plate of the present application can improve the exhaust condition inside the battery cell, reduce the internal pressure of the battery cell, and further reduce the probability of thermal runaway of the battery cell and the risk of cracking of the shell weld caused by excessive pressure.

[0079] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present invention.

[0081] Reference Figure 1 , Figure 1 A schematic diagram of a vehicle 1 provided for some embodiments of the present invention. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 1, and the battery 1000 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 1000 may be used to power the vehicle 1, for example, the battery 1000 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0082] In some embodiments of the present application, the battery 1000 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0083] Reference Figure 2 and Figure 3 , Figure 2 is a schematic diagram of a battery 1000 according to some embodiments of the present invention, Figure 3 1 is an exploded view of a battery 1000 according to some embodiments of the present invention. The battery 1000 includes a box 200 and a battery cell 100, the box 200 has a cavity, and the battery cell 100 is accommodated in the cavity of the box 200. The box 200 is used to provide a storage space for the battery cell 100, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may include a first part (such as the main box 201 described below) and a second part (such as the cover plate 202 described below), the first part and the second part cover each other, and the first part and the second part jointly define a storage space for accommodating the battery cell 100. The second part may be a hollow structure with one end open, the first part may be a plate-like structure, the first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part may also be hollow structures with one side open, and the open side of the first part covers the open side of the second part. Of course, the box 200 formed by the first part and the second part may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0084] In the battery 1000, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box 200; of course, the battery 1000 may also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0085] Each battery cell 100 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 100 may be cylindrical, flat, rectangular, or in other shapes.

[0086] Reference Figure 4 , Figure 4Schematic diagram of a battery cell 100 provided in some embodiments of the present invention, wherein the battery cell 100 refers to the smallest unit constituting a battery 1000. Figure 4 As shown, the battery cell 100 includes an end cap 40, a housing 10, an electrode assembly 30, a transfer sheet 50 and other functional components.

[0087] The end cap 40 refers to a component that covers the opening of the shell 10 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 40 can be adapted to the shape of the shell 10 to match the shell 10. Optionally, the end cap 40 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 40 is not easily deformed when squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as output terminals can be provided on the end cap 40. The output terminal can be used to electrically connect to the electrode assembly 30 for outputting or inputting electrical energy of the battery cell 100. In some embodiments, the end cap 40 can also be provided with an explosion-proof valve for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. The material of the end cap 40 can also be a variety of materials, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, a first insulating member and a transfer sheet 50 may be further disposed on the inner side of the end cap 40. The first insulating member may be used to isolate the electrical connection components in the housing 10 from the end cap 40 to reduce the risk of short circuit; the transfer sheet 50 is connected to the tab for current transmission. Exemplarily, the first insulating member may be plastic, rubber, etc.

[0088] The shell 10 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 30 and other components. The shell 10 and the end cap 40 can be independent components, and an opening can be set on the shell 10, and the internal environment of the battery cell 100 is formed by covering the opening with the end cap 40 at the opening. Without limitation, the end cap 40 and the shell 10 can also be integrated. Specifically, the end cap 40 and the shell 10 can form a common connection surface before other components are put into the shell, and when the interior of the shell 10 needs to be encapsulated, the end cap 40 is covered with the shell 10. The shell 10 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 10 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell 10 can be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0089] The electrode assembly 30 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 30 may be included in the housing 10. The electrode assembly 30 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 30, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1000, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0090] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0091] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0092] The material of the diaphragm can be PP (polypropylene) or PE (polyethylene).

[0093] Reference below Figure 4-Figure 11 A battery cell 100 according to an embodiment of the first aspect of the present invention is described. Figure 4 is an exploded view of a battery cell 100 according to some embodiments of the present invention, Figure 5 is a schematic diagram of a battery cell 100 according to some embodiments of the present invention, Figure 6 yes Figure 4 Schematic diagram of the air guide plate 20 shown in FIG. Figure 7 yes Figure 4 A schematic diagram of the air guide plate 20 from another angle shown in FIG. Figure 8 yes Figure 4 A schematic diagram of the air guide plate 20 at another angle shown in FIG. Fig. 9 is a schematic diagram of a battery cell 100 from another angle according to some embodiments of the present invention, Fig.10 is along Fig. 9 The cross-sectional view of line AA shown in FIG. Fig.11 yes Fig. 9 An enlarged view of the circled area A.

[0094] The embodiment of the present invention provides a battery cell 100, such as Figure 4 As shown, the battery cell 100 includes: a shell 10 and an air guide plate 20, the shell 10 has a accommodating chamber 11, the accommodating chamber 11 has a first wall and a second wall arranged opposite to each other in a first direction, and the first wall is provided with an explosion-proof valve; the air guide plate 20 is arranged in the accommodating chamber 11 and is located between the first wall and the second wall, the air guide plate 20 has an air guide channel and an air vent 23, the air guide channel extends along the first direction, and the air guide channel is connected to the accommodating chamber 11 outside the air guide channel through the air vent 23.

[0095] Specifically, the housing 10 is mainly used to isolate the inside of the battery cell 100 from the outside, effectively preventing the inside of the battery cell 100 from communicating with the outside, thereby improving the reliability of the battery cell 100. The air guide plate 20 can guide the gas in the accommodating cavity 11 to the explosion-proof valve through the air guide channel and discharge it through the explosion-proof valve, which can effectively reduce the pressure inside the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100.

[0096] For example, the first direction can refer to the e3 direction in the figure, where the e3 direction is also the height direction of the battery cell 100, and the first wall and the second wall can be the top wall and the bottom wall of the battery cell 100 respectively. Thus, the explosion-proof valve can be set on the top wall or the bottom wall of the battery cell 100.

[0097] Among them, the explosion-proof valve is arranged on the first wall of the accommodating chamber 11, and the air guide channel is extended along the first direction, which is conducive to directly guiding the gas to the explosion-proof valve position and improving the efficiency of gas guidance. The air guide channel can increase the exhaust space inside the accommodating chamber 11, which is conducive to the flow of gas inside the accommodating chamber 11. At the same time, the air guide channel can also limit the movement direction of the gas, avoid the directionless movement of the gas in the shell 10, increase the flow speed of the gas, and realize the gas generated during the cycle of the battery cell 100 to the explosion-proof valve, thereby increasing the smoothness of the exhaust and increasing the exhaust effect.

[0098] When the battery cell 100 is recycled, a large amount of gas is generated inside the battery cell 100. The gas can enter the air guide channel through the vent 23, and then be discharged to the explosion-proof valve through the air guide channel. Therefore, the air guide plate 20 of the present application can improve the exhaust condition inside the battery cell 100, reduce the internal pressure of the battery cell 100, and further reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 caused by excessive pressure.

[0099] Further, the air guide plate 20 may be disposed between two adjacent electrode assemblies 30, in which case the air guide plate 20 may define an air guide channel in the plate; the air guide plate 20 may also be disposed between the electrode assembly 30 and the accommodating cavity 11, in which case the air guide plate 20 may also define an air guide channel in the plate, and the air guide plate 20 may also cooperate with the inner wall of the accommodating cavity 11 to define air conduction. The air guide plate 20 may also be disposed between the electrode assemblies 30 and between the electrode assembly 30 and the accommodating cavity 11.

[0100] According to the battery cell 100 of the embodiment of the present invention, by providing the air guide plate 20, the gas generated by the battery cell 100 during the cycle process can have a larger discharge space, thereby increasing the exhaust effect, and further reducing the internal pressure of the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 due to excessive pressure; at the same time, the movement direction of the gas can also be limited, and the gas generated by the battery cell 100 during the cycle process can be guided so that it can be discharged smoothly, thereby increasing the exhaust effect.

[0101] According to some embodiments of the present invention, Figure 4 As shown, the first wall is the top wall of the accommodating chamber 11 , and the explosion-proof valve is arranged on the first wall of the housing 10 .

[0102] It can be understood that the first wall is the top wall of the accommodating chamber 11, and the second wall is the bottom wall of the accommodating chamber 11. The explosion-proof valve is arranged on the first wall of the accommodating chamber 11, that is, it is arranged on the upper part of the battery cell 100. This is conducive to ensuring the exhaust space at the position of the explosion-proof valve, so that the gas in the accommodating chamber 11 can be discharged smoothly, thereby reducing the internal pressure of the battery cell 100, reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 due to excessive pressure.

[0103] This embodiment arranges the explosion-proof valve on the top wall of the accommodating chamber 11, which is beneficial to ensuring the exhaust space at the location of the explosion-proof valve, so that the gas in the accommodating chamber 11 can be discharged smoothly, thereby reducing the internal pressure of the battery cell 100, reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 caused by excessive pressure.

[0104] According to some embodiments of the present invention, Figure 4 As shown, an electrode assembly 30 is disposed in the accommodating cavity 11 , and the air guide plate 20 is disposed between the side wall of the accommodating cavity 11 and the electrode assembly 30 .

[0105] Among them, the electrode assembly 30 is the core component of the battery cell 100, and the electrode assembly 30 is composed of a positive electrode sheet, a negative electrode sheet and a diaphragm. The battery cell 100 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. When the battery 1000 is cyclically working, the electrode assembly 30 will expand, and the electrode assemblies 30 will squeeze each other. Then, the air guide plate 20 is arranged between the side wall of the accommodating cavity 11 and the electrode assembly 30, which can reduce the damage of the electrode assembly 30 or the air guide plate 20 caused by the mutual squeezing of the air guide plate 20 and the electrode assembly 30. At the same time, it can also effectively reduce the probability of blockage of the air guide channel, thereby ensuring the exhaust space and increasing the exhaust effect.

[0106] In this embodiment, the air guide plate 20 is arranged between the side wall of the accommodating cavity 11 and the electrode assembly 30, which can reduce the damage to the electrode assembly 30 or the air guide plate 20 caused by the mutual squeezing of the air guide plate 20 and the electrode assembly 30. At the same time, it can also effectively reduce the probability of blockage of the air guide channel, thereby ensuring the exhaust space and increasing the exhaust effect.

[0107] According to some embodiments of the present invention, Figure 4 As shown, there are multiple air guide plates 20 , and the multiple air guide plates 20 are arranged along the circumference of the accommodating cavity 11 .

[0108] Among them, for example Figure 4 As shown, the shell 10 is rectangular, and the accommodating cavity 11 is formed as a rectangular cavity with a rectangular cross-section. The circumference of the accommodating cavity 11 refers to the side walls extending vertically around the accommodating cavity 11. In this way, the air guide plate 20 can guide and exhaust the gas generated by the battery cell 100 during the cycle process in multiple directions, thereby improving the exhaust effect of the battery cell 100, effectively reducing the probability of thermal runaway of the battery cell 100, and improving the reliability of the battery cell 100.

[0109] For example, the number of the air guide plates 20 may be two, three or more.

[0110] In this embodiment, a plurality of air guide plates 20 are provided, and the plurality of air guide plates 20 are arranged along the circumference of the accommodating cavity 11 , so as to improve the exhaust effect of the battery cell 100 , effectively reduce the probability of thermal runaway of the battery cell 100 , and improve the reliability of the battery cell 100 .

[0111] According to some embodiments of the present invention, Figure 4As shown, the accommodating cavity 11 has a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged relative to each other in a second direction in a horizontal plane, the third side wall and the fourth side wall are arranged relative to each other in a third direction in a horizontal plane, and the first direction, the second direction and the third direction are perpendicular. An air guide plate 20 is provided between the first side wall and the second side wall and the electrode assembly 30, and / or an air guide plate 20 is provided between the third side wall and the fourth side wall and the electrode assembly 30.

[0112] That is to say, the air guide plate 20 may be provided only between the first side wall and the second side wall and the electrode assembly 30, or only between the third side wall and the fourth side wall and the electrode assembly 30, or the air guide plate 20 may be provided between the first side wall and the second side wall and the electrode assembly 30, and also between the third side wall and the fourth side wall and the electrode assembly 30.

[0113] For example, the second direction can refer to the attached Figure 4 The e1 direction in the figure; the third direction can refer to the attached Figure 4 In the direction of e2, the second direction is formed as the thickness direction of the battery cell 100, the third direction is formed as the width direction of the battery cell 100, the first side wall and the second side wall are respectively the two side walls in the thickness direction of the accommodating cavity 11, and the third side wall and the fourth side wall are respectively the two side walls in the width direction of the accommodating cavity 11.

[0114] In this embodiment, by arranging the air guide plate 20 between the first side wall and the second side wall and the electrode assembly 30 or between the third side wall and the fourth side wall and the electrode assembly 30, it is possible to achieve smooth exhaust and improve the energy density of the battery cell 100; and the air guide plate 20 is arranged between the first side wall, the second side wall, the third side wall and the fourth side wall and the electrode assembly 30, which can increase the space of the air guide channel, greatly increase the exhaust space, and increase the exhaust effect, and further reduce the pressure inside the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 due to excessive pressure.

[0115] According to some embodiments of the present invention, Figure 4 As shown, in the first direction (eg Figure 4 In the direction e3 shown in the figure, the air guide plate 20 extends from the first wall of the accommodating cavity 11 to the second wall of the accommodating cavity 11.

[0116] The first wall of the accommodating cavity 11 is the top of the battery cell 100, and the second wall of the accommodating cavity 11 is the bottom of the battery cell 100. The explosion-proof valve is arranged at the top of the battery cell 100, and is used to discharge the over-pressure gas inside the battery cell 100. Furthermore, the air guide plate 20 extends from the bottom of the accommodating cavity 11 to the top of the accommodating cavity 11, and can quickly guide the gas generated at the rest of the battery cell 100 to the explosion-proof valve at the top, increase the speed of the gas flowing to the explosion-proof valve, and discharge the gas to the outside of the battery cell 100, thereby effectively reducing the probability of thermal runaway of the battery cell 100.

[0117] In this embodiment, by arranging an air guide plate 20 in a first direction extending from the second wall of the accommodating cavity 11 to the first wall of the accommodating cavity 11, the gas generated inside the battery cell 100 can be guided to the explosion-proof valve, and then the gas can be discharged to the outside of the battery cell 100, thereby effectively reducing the occurrence of thermal runaway of the battery cell 100.

[0118] According to some embodiments of the present invention, the distance between the air guide plate 20 and the second wall of the accommodating cavity 11 is less than or equal to 10 mm;

[0119] For example, the distance between the air guide plate 20 and the second wall of the accommodating cavity 11 may be 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 8 mm or 10 mm.

[0120] In this embodiment, by setting the distance between the air guide plate 20 and the second wall of the accommodating cavity 11 to be less than or equal to 10 mm, the probability of exhaust failure of the air guide plate 20 can be effectively reduced, the exhaust effect can be improved, and the probability of thermal runaway of the battery cell 100 can be reduced.

[0121] According to some embodiments of the present invention, the distance between the air guide plate 20 and the first wall of the accommodating cavity 11 is less than or equal to 10 mm.

[0122] For example, the distance between the air guide plate 20 and the first wall of the accommodating cavity 11 may be 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 8 mm or 10 mm.

[0123] It is understandable that when the distance between the air guide plate 20 and the first wall and the second wall of the accommodating chamber 11 is too large, the gas entering the air guide channel will not be effectively transmitted to the explosion-proof valve, and the gas can also enter the accommodating chamber 11 again from both ends of the air guide channel, thereby reducing the exhaust effect and increasing the probability of thermal runaway of the battery cell 100.

[0124] In this embodiment, by setting the distance between the air guide plate 20 and the first wall of the accommodating cavity 11 to be less than or equal to 10 mm, the probability of exhaust failure of the air guide plate 20 can be effectively reduced, the exhaust effect can be improved, and the probability of thermal runaway of the battery cell 100 can be reduced.

[0125] According to some embodiments of the present invention, Figure 4 As shown, the air guide plate 20 has a first edge and a second edge arranged relative to each other in a second direction in a horizontal plane, the second direction is perpendicular to the first direction and to the thickness direction of the air guide plate 20, the accommodating cavity 11 has a first side wall and a second side wall arranged relative to each other in the second direction, the first edge is arranged toward the first side wall, and the second edge is arranged toward the second side wall, wherein the spacing between the first edge and the first side wall in the second direction is less than or equal to 10 mm; and / or the spacing between the second edge and the second side wall in the second direction is less than or equal to 10 mm.

[0126] Specifically, the second direction may be the width direction of the air guide plate 20 (eg Figure 4 The first edge and the second edge are the two side edges in the width direction respectively. By limiting the distance between the first edge and the first side wall and the distance between the second edge and the second side wall, the width of the air guide plate 20 can be made close to the distance between the first side wall and the second side wall, thereby increasing the width of the air guide plate 20, and further increasing the width of the air guide channel and the area of ​​the flow cross section, thereby increasing the exhaust space of the battery cell 100.

[0127] For example, the distance between the first edge and the first side wall in the second direction may be 1mm, 2mm, 3mm, 5mm, 6mm, 8mm or 10mm; the distance between the second edge and the second side wall in the second direction may also be 1mm, 2mm, 3mm, 5mm, 6mm, 8mm or 10mm.

[0128] In this embodiment, by setting the spacing between the first edge and the first side wall in the second direction to be less than or equal to 10 mm, and the spacing between the second edge and the second side wall in the second direction to be less than or equal to 10 mm, the probability of exhaust failure of the air guide plate 20 can be effectively reduced, the exhaust effect can be improved, and the probability of thermal runaway of the battery cell 100 can be reduced.

[0129] According to some embodiments of the present invention, Figure 6 As shown, the air guide plate 20 includes: a plate body 21 and a plurality of support ribs 22, the plate body 21 is extended along a first direction, the support ribs 22 are connected to a side of the side wall of the plate body 21 facing the accommodating cavity 11, the support ribs 22 extend along the first direction, and the plurality of support ribs 22 are arranged at intervals in a second direction, the second direction is perpendicular to the first direction and perpendicular to the thickness direction of the air guide plate 20, and the support ribs 22, the plate body 21 and the side wall of the accommodating cavity 11 cooperate to define an air guide channel.

[0130] For example, the second direction may refer to the direction of e1 in the drawing.

[0131] Specifically, the plate body 21 is a rectangular plate, and the two large surfaces of the plate body 21 are respectively in contact with the accommodating cavity 11 and the electrode assembly 30, wherein the side of the plate body 21 facing away from the side wall of the accommodating cavity 11 is in contact with the electrode assembly 30, and the side of the plate body 21 facing the side wall of the accommodating cavity 11 is in contact with the side wall of the accommodating cavity 11 through the support ribs 22. Thus, the plate body 21 and the electrode assembly 30 are in surface contact, which can increase the contact area between the air guide plate 20 and the electrode assembly 30, and further effectively prevent the electrode assembly 30 or the air guide plate 20 from being damaged due to the expansion and squeezing of the electrode assembly 30, thereby improving the reliability of the battery cell 100.

[0132] The support rib 22 is formed as a strip-shaped protrusion, one side of the support rib 22 is connected to the plate body 21, and the other side is in contact with the side wall of the accommodating cavity 11. The support rib 22 mainly plays a supporting role, so that a certain distance can be formed between the plate body 21 and the accommodating cavity 11, and then an air guide channel can be constructed to achieve smooth exhaust. At the same time, the air guide channel is defined by the support rib 22, the plate body 21 and the side wall of the accommodating cavity 11, which can reduce the use of materials, simplify the overall structure of the air guide plate 20, reduce the process difficulty of the air guide plate 20, and thus reduce the production cost of the battery cell 100.

[0133] There are multiple support ribs 22, for example, the number of support ribs 22 can be two, three or more, and multiple support ribs 22 are arranged at intervals in the second direction, and an air guide channel is formed between two adjacent support ribs 22, and then at least one air guide channel can be formed on the air guide plate 20, thereby increasing the exhaust effect; at the same time, multiple support ribs 22 can also increase the structural strength of the air guide plate 20, thereby reducing the deformation probability of the air guide plate 20, thereby reducing the occurrence of thermal runaway of the battery cell 100 due to the obstruction of the exhaust path.

[0134] This embodiment can increase the contact area between the air guide plate 20 and the electrode assembly 30 by providing a plate body 21 and a plurality of support ribs 22, thereby effectively preventing damage to the electrode assembly 30 or the air guide plate 20 caused by the expansion and squeezing of the electrode assembly 30, thereby improving the reliability of the battery cell 100; at the same time, it can also increase the structural strength of the air guide plate 20, thereby reducing the deformation probability of the air guide plate 20, thereby reducing the probability of thermal runaway of the battery cell 100 due to a blocked exhaust path.

[0135] According to some embodiments of the present invention, Figure 6 As shown, the vent hole 23 is formed on the plate body 21 and penetrates the plate body 21 along the thickness direction of the plate body 21 , and the vent hole 23 is formed between two adjacent supporting ribs 22 .

[0136] Among them, an air guide channel is formed between two adjacent support ribs 22, and a vent hole 23 is formed between the two adjacent support ribs 22, which can be used to connect the air guide channel with the accommodating cavity 11, so that the gas generated during the cycle of the battery cell 100 can enter the air guide channel through the vent hole 23, and then move in a directed manner through the air guide channel to the explosion-proof valve and be discharged through the explosion-proof valve.

[0137] In this embodiment, by providing the vent holes 23 , the gas generated during the cycle of the battery cell 100 can enter the air guide channel along the vent holes 23 and be discharged to the outside of the battery cell 100 through the air guide channel, thereby achieving the flow guiding effect of the air guide plate 20 .

[0138] According to some embodiments of the present invention, Figure 4 As shown, there are multiple vent holes 23, and the multiple vent holes 23 are arranged along the length direction of the plate body 21 (for example Figure 6 e3 shown) and width direction (e.g. Figure 6 The two pairs of ferrules are arranged in an interlaced manner (in the direction of e1 shown).

[0139] For example, the number of the vent holes 23 may be two, three or more.

[0140] In this embodiment, a plurality of vent holes 23 are provided and spaced apart in the length direction and the width direction of the plate body 21. In this way, the total opening area of ​​the vent holes 23 can be effectively increased so that the area of ​​the vent holes 23 can meet the exhaust demand. At the same time, the gas in the accommodating cavity 11 can enter the air guide channel through the vent holes 23 at different positions, thereby increasing the exhaust effect and improving the exhaust efficiency.

[0141] According to some embodiments of the present invention, the vent hole 23 is a circular hole, an elliptical hole or a polygonal hole.

[0142] That is to say, the vent hole 23 can be a circular hole, an elliptical hole, or a polygonal hole. The circular hole, the elliptical hole, or the polygonal hole has a simple structure and is easy to manufacture, thereby reducing the difficulty of manufacturing the air guide plate 20 and increasing the manufacturing rate of the air guide plate 20.

[0143] Preferably, the vent hole 23 is circular, wherein the area of ​​the circular hole is relatively large, thereby facilitating the discharge of gas.

[0144] In this embodiment, by setting the vent holes 23 to be circular holes, elliptical holes or polygonal holes, the difficulty of manufacturing the air guide plate 20 can be reduced and the manufacturing rate of the air guide plate 20 can be increased.

[0145] According to some embodiments of the present invention, in a projection plane perpendicular to the thickness direction of the plate body 21 , a ratio of a projection area of ​​the plurality of vent holes 23 to a projection area of ​​the plate body 21 is 0.3-0.7.

[0146] For example, in a projection plane perpendicular to the thickness direction of the plate body 21 , the ratio of the projection area of ​​the plurality of vent holes 23 to the projection area of ​​the plate body 21 may be 0.3, 0.4, 0.5, 0.6 or 0.7.

[0147] In this embodiment, by setting the ratio of the projected area of ​​the multiple ventilation holes 23 to the projected area of ​​the plate body 21 to 0.3-0.7, the area occupied by the multiple ventilation holes 23 on the plate body 21 can be not too large, which is beneficial to improving the structural strength and stability of the plate body 21. At the same time, it can also improve the plate body 21's limiting and gas guiding functions for the gas entering the gas guide channel, so that the gas can be smoothly discharged along the gas guide channel; it can also ensure that the area occupied by the ventilation holes 23 on the plate body 21 is not too small, so that the area of ​​the ventilation holes 23 can meet the exhaust requirements, thereby improving the exhaust effect, and further reducing the probability of thermal runaway of the battery cell 100.

[0148] According to some embodiments of the present invention, Figure 7 As shown, in the second direction, among the plurality of support ribs 22 , two support ribs 22 located on both sides of the air guide plate 20 in the second direction are respectively flush with the edges of both sides of the plate body 21 in the second direction.

[0149] In this embodiment, two support ribs 22 located on both sides of the air guide plate 20 in the second direction are respectively flush with the edges of the plate body 21 on both sides in the second direction, thereby increasing the exhaust space of the air guide channel and effectively improving the smoothness of exhaust.

[0150] According to some embodiments of the present invention, in the thickness direction of the plate body 21 , the thickness of the support rib 22 is 2 mm-4 mm.

[0151] For example, in the thickness direction of the plate body 21 , the thickness of the support rib 22 may be 2 mm, 3 mm or 4 mm.

[0152] It can be understood that, in the thickness direction of the plate body 21, the thickness of the support rib 22 is equivalent to the distance between the plate body 21 and the side wall of the accommodating cavity 11, that is, the thickness of the support rib 22 affects the cross-sectional size of the gas guide channel. When the thickness of the support rib 22 is less than 2 mm, when the battery cell 100 starts to circulate, the distance between the plate body 21 and the accommodating cavity 11 may be too small, thereby causing the gas generated by the battery cell 100 to be unable to be discharged from the gas guide channel in time, thereby causing the pressure in the battery cell 100 to be too high, the weld to crack, or the explosion-proof valve to crack to a large surface, thereby affecting the service life of the battery cell 100.

[0153] Regarding the thickness of the plate body 21 , when the thickness of the support ribs 22 is greater than 4 mm, the thickness of the air guide plate 20 will increase. Thus, the air guide plate 20 will occupy too much internal space of the accommodating cavity 11 , which will lead to a reduction in the space of the electrode assembly 30 and affect the energy density of the battery cell 100 .

[0154] In this embodiment, by setting the thickness of the support ribs 22 to 2mm-4mm in the thickness direction of the plate body 21, the gas discharge space can be increased without affecting the energy density of the battery cell 100, so that the gas in the cycle of the battery cell 100 can be discharged in time, and the internal pressure of the battery cell 100 can be reduced, thereby reducing the probability of thermal runaway of the battery cell 100 and improving the reliability and service life of the battery cell 100.

[0155] According to some embodiments of the present invention, the support rib 22 and the plate body 21 are integrally formed, or the support rib 22 and the plate body 21 are separate parts, and the support rib 22 and the plate body 21 are connected by hot melt.

[0156] That is to say, in some specific embodiments, the support rib 22 and the plate body 21 are integrally formed, and in other specific embodiments, the support rib 22 and the plate body 21 are separate parts, and the support rib 22 and the plate body 21 are connected by hot melt.

[0157] The support ribs 22 and the plate body 21 are integrally formed, which can simplify the production steps of the air guide plate 20 , thereby increasing the production rate of the air guide plate 20 and reducing the production cost of the air guide plate 20 .

[0158] The support rib 22 and the plate body 21 are separate parts and connected by hot melt. The hot melt connection is simple, and the support rib 22 and the plate body 21 can be produced separately, so the process complexity of the air guide plate 20 can be reduced, the mold opening cost can be reduced, and the production cost of the air guide plate 20 can be reduced.

[0159] In this embodiment, the support ribs 22 are integrally formed with the plate body 21, so that the production steps of the air guide plate 20 can be simplified, thereby increasing the production rate of the air guide plate 20 and reducing the production cost of the air guide plate 20. By providing the support ribs and the plate body 21 as separate parts, and the support ribs 22 and the plate body 21 are hot-melt connected, the process complexity of the air guide plate 20 can be reduced, the mold opening cost can be reduced, and the production cost of the air guide plate 20 can be reduced.

[0160] According to some embodiments of the present invention, the air guide plate 20 is a polypropylene piece.

[0161] Polypropylene is abbreviated as PP, which is a polymer formed by polyaddition reaction of propylene. Polypropylene is a thermoplastic synthetic resin with excellent performance, and has corrosion resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high-wear resistance processing performance. The price of polypropylene material is relatively low, and the use of polypropylene material to make the air guide plate 20 can reduce the possibility of the air guide plate 20 being corroded or crushed by the electrolyte, thereby improving the reliability and service life of the air guide plate 20, and at the same time, it can also reduce the production cost of the air guide plate 20.

[0162] In this embodiment, by setting the air guide plate 20 to be a polypropylene member, the possibility of the air guide plate 20 being corroded or crushed by the electrolyte can be reduced, thereby improving the reliability and service life of the air guide plate 20, and at the same time, the production cost of the air guide plate 20 can be reduced.

[0163] The battery 1000 according to the second embodiment of the present invention includes the battery cell 100 according to the first embodiment of the present invention.

[0164] In some specific embodiments of the present invention, for example Figure 3 As shown, the battery 1000 may further include: a main box 201 and a cover plate 202 , the main box 201 having a cavity with an open top, a plurality of battery cells 100 being disposed in the cavity, and the cover plate 202 being sealed on the top of the main box 201 by fasteners.

[0165] Optionally, a plurality of battery cells 100 may be stacked and arranged in the cavity along a thickness direction of the battery cells 100 .

[0166] Optionally, the main box 201 is formed in the shape of a rectangular box body, the inner side of the main box 201 defines a cavity, the top of the cavity is open, the main box 201 is provided with a plurality of first fixing holes, the cover plate 202 is formed in the shape of a horizontally arranged flat plate, the cover plate 202 is provided with a plurality of second fixing holes that penetrate the cover plate 202 in the up and down directions, the plurality of first fixing holes correspond to the plurality of second fixing holes one by one and are opposite to each other up and down, the battery 1000 also includes a plurality of fasteners, the plurality of fasteners pass through the first fixing holes and the second fixing holes to fasten the cover plate 202 to the upper side of the main box 201 body 200.

[0167] Optionally, the cover plate 202 may be a carbon steel plate, an aluminum plate or a composite material plate.

[0168] This embodiment can facilitate the loading of the battery cell 100 into the box body 200 by configuring the box body 200 as a main box 201 and a cover plate 202 arranged separately. The main box 201 and the cover plate 202 are connected by fasteners to achieve a detachable connection, which is convenient for maintenance and replacement, and can ensure the connection strength between the main box 201 and the cover plate 202, thereby ensuring the overall structural strength of the battery 1000.

[0169] In some specific embodiments of the present invention, a first adhesive layer is provided on the bottom wall of the cavity, and the bottoms of the multiple battery cells 100 are connected to the bottom wall of the main box 201 through the first adhesive layer; and / or, a second adhesive layer is provided on the cover plate 202, and the tops of the multiple battery cells 100 are connected to the cover plate 202 through the second adhesive layer.

[0170] The battery 1000 may include only the first glue layer, or only the second glue layer, or may include both the first glue layer and the second glue layer. The first glue layer is used to bond and connect the bottom wall of the main box 201 and the battery cell 100, and the second glue layer is used to bond and connect the cover plate 202 and the battery cell 100, so as to reliably fix multiple battery cells 100 in the box 200, improve the reliability and stability of the connection between the battery cell 100 and the box 200, and prevent the battery cell 100 from shaking in the box 200.

[0171] In this embodiment, a first adhesive layer and a second adhesive layer are provided, and the bottom of the battery cell 100 is bonded and fixed to the bottom wall of the main box 201 through the first adhesive layer, and the top of the battery cell 100 is bonded and fixed to the cover plate 202 through the second adhesive layer. In this way, the overall strength of the battery 1000 can be improved and the connection stability of the battery cell 100 can be ensured.

[0172] The battery 1000 according to the embodiment of the present invention is provided with the battery cell 100 of the embodiment of the first aspect, thereby improving the overall performance of the battery 1000.

[0173] The electric device according to the embodiment of the third aspect of the present invention comprises the battery 1000 according to the embodiment of the second aspect of the present invention.

[0174] The power-consuming device may be any of the aforementioned devices or systems using the battery 1000 .

[0175] According to the electric device of the embodiment of the present invention, the overall performance of the electric device is improved by disposing the battery 1000 of the above-mentioned second aspect embodiment.

[0176] The following will refer to Figure 4-Figure 11 A battery cell 100 according to a specific embodiment of the present invention is described.

[0177] Reference Figure 4 The battery cell 100 includes an end cap 40, a transfer sheet 50, an electrode assembly 30, an air guide plate 20 and a shell 10, wherein the shell 10 is formed with an open end, and the end cap 40 is arranged on one side of the opening of the shell 10 to seal the open end of the shell 10; the shell 10 has a accommodating cavity 11, and the accommodating cavity 11 is filled with electrolyte, and the electrode assembly 30 and the air guide plate 20 each include two, which are arranged between the electrode assembly 30 and the side wall of the accommodating cavity 11.

[0178] Specifically, the accommodating cavity 11 has a first side wall, a second side wall, a third side wall and a fourth side wall, wherein the first side wall and the second side wall are arranged relative to each other in a second direction in a horizontal plane, and the third side wall and the fourth side wall are arranged relative to each other in a third direction in a horizontal plane, and the second direction is perpendicular to the third direction, wherein the second direction is the e1 direction shown in the figure, and the third direction is the e2 direction shown in the figure, and two air guide plates 20 are vertically arranged between the electrode assembly 30 and the third side wall and the fourth side wall, respectively.

[0179] The air guide plate 20 includes a plate body 21 and a plurality of support ribs 22. The plurality of support ribs 22, the plate body 21 and the side wall of the accommodating cavity 11 cooperate to define at least one air guide channel. The plate body 21 and the support ribs 22 are both arranged vertically. The support ribs 22 are connected to one side of the plate body 21 facing the side wall of the accommodating cavity 11. The plurality of support ribs 22 are arranged along the width direction of the plate body 21 (for example, Figure 6 In the direction e1 shown in the figure, the two support ribs 22 located at the edge of the air guide plate 20 are arranged at intervals, and in the width direction, the two support ribs 22 located at the edge of the air guide plate 20 are respectively flush with the two side edges of the plate body 21 in the width direction.

[0180] The air guide plate 20 is also formed with a vent hole 23, which is formed on the plate body 21 and penetrates the plate body 21 along the thickness direction of the plate body 21, and is formed between two adjacent support ribs 22. The vent hole 23 is circular, and there are multiple vent holes 23, and the multiple vent holes 23 are arranged along the length direction of the plate body 21 (for example, Figure 6 e3 direction shown) and width direction (e.g. Figure 6 The vent holes 23 are arranged at intervals in the direction e1 shown in the figure, and in the projection plane perpendicular to the thickness direction of the plate body 21, the ratio of the projection area of ​​the plurality of vent holes 23 to the projection area of ​​the plate body 21 is 0.3-0.7.

[0181] Furthermore, the air guide plate 20 extends from the bottom of the accommodating cavity 11 to the top of the accommodating cavity 11, and the air guide plate 20 has a first edge and a second edge arranged relatively to each other in a second direction in a horizontal plane, wherein the spacing between the air guide plate 20 and the bottom wall and the top wall of the accommodating cavity 11 is less than or equal to 10 mm, and the spacing between the first edge and the first side wall in the second direction is less than or equal to 10 mm; the spacing between the second edge and the second side wall in the second direction is less than or equal to 10 mm.

[0182] In addition, the air guide plate 20 is a polypropylene member, the support ribs 22 and the plate body 21 are separate members, and the support ribs 22 are connected by hot melt to the plate body 21. In the thickness direction of the plate body 21, the thickness of the support ribs 22 is 2mm-4mm.

[0183] When the battery cell 100 is recycled, a large amount of gas is generated inside the battery cell 100. The gas can enter the air guide channel through the vent 23, and then be discharged to the explosion-proof valve through the air guide channel. Therefore, the air guide plate 20 of the present application can improve the exhaust condition inside the battery cell 100, reduce the internal pressure of the battery cell 100, and further reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 caused by excessive pressure.

[0184] According to the battery cell 100 of the embodiment of the present invention, by providing the air guide plate 20, the gas generated by the battery cell 100 during the cycle process can have a larger discharge space, thereby increasing the exhaust effect, and further reducing the internal pressure of the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the shell 10 due to excessive pressure; at the same time, the movement direction of the gas can also be limited, and the gas generated by the battery cell 100 during the cycle process can be guided so that it can be discharged smoothly, thereby increasing the exhaust effect.

[0185] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing (10), the housing (10) having a containing chamber (11), the containing chamber (11) having a first wall and a second wall arranged opposite to each other in a first direction, the first wall being provided with an explosion-proof valve; An air guide plate (20), the air guide plate (20) being arranged in the accommodating cavity (11) and being located between the first wall and the second wall, the air guide plate (20) having an air guide channel and an air vent (23), the air guide channel extending along the first direction, the air guide channel being in communication with the accommodating cavity (11) outside the air guide channel through the air vent (23).

2. The battery cell according to claim 1, characterized in that: The first wall is the top wall of the accommodating chamber (11), and the explosion-proof valve is arranged on the first wall of the housing (10).

3. The battery cell according to claim 1, characterized in that: An electrode assembly (30) is arranged in the accommodating cavity (11), and the air guide plate (20) is arranged between a side wall of the accommodating cavity (11) and the electrode assembly (30).

4. The battery cell according to claim 3, characterized in that: There are a plurality of air guide plates (20), and the plurality of air guide plates (20) are arranged along the circumference of the accommodating cavity (11).

5. The battery cell according to claim 4, characterized in that: The accommodating cavity (11) comprises a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged opposite to each other in a second direction, the third side wall and the fourth side wall are arranged opposite to each other in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The air guide plate (20) is provided between the first side wall, the second side wall and the electrode assembly (30), and / or the air guide plate (20) is provided between the third side wall, the fourth side wall and the electrode assembly (30).

6. The battery cell according to claim 1, characterized in that: The air guide plate (20) extends from a first wall of the accommodating cavity (11) to a second wall of the accommodating cavity (11).

7. The battery cell according to claim 6, characterized in that: The distance between the air guide plate (20) and the second wall of the accommodating cavity (11) is less than or equal to 10 mm; and / or the distance between the air guide plate (20) and the first wall of the accommodating cavity (11) is less than or equal to 10 mm.

8. The battery cell according to claim 1, characterized in that: The air guide plate (20) has a first edge and a second edge arranged opposite to each other in a second direction, the second direction is perpendicular to the first direction and perpendicular to the thickness direction of the air guide plate (20), the accommodating cavity (11) has a first side wall and a second side wall arranged opposite to each other in the second direction, the first edge is arranged toward the first side wall, and the second edge is arranged toward the second side wall, Wherein, a distance between the first edge and the first side wall in the second direction is less than or equal to 10 mm; and / or a distance between the second edge and the second side wall in the second direction is less than or equal to 10 mm.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The air guide plate (20) comprises: a plate body (21) and a plurality of support ribs (22); the plate body (21) is extended along the first direction; the support ribs (22) are connected to a side of the side wall of the plate body (21) facing the accommodating cavity (11); the support ribs (22) extend along the first direction; a plurality of the support ribs (22) are arranged at intervals in a second direction; the second direction is perpendicular to the first direction and perpendicular to the thickness direction of the air guide plate (20); the support ribs (22), the plate body (21) and the side wall of the accommodating cavity (11) cooperate to define the air guide channel.

10. The battery cell according to claim 9, characterized in that: The vent hole (23) is formed on the plate body (21) and penetrates the plate body (21) along the thickness direction of the plate body (21), and the vent hole (23) is formed between two adjacent support ribs (22).

11. The battery cell according to claim 9, characterized in that: The number of the ventilation holes (23) is multiple, and the multiple ventilation holes (23) are arranged at intervals along the length direction and the width direction of the plate body (21).

12. The battery cell according to claim 11, characterized in that: The vent hole (23) is a circular hole, an elliptical hole or a polygonal hole.

13. The battery cell according to claim 11, characterized in that: In a projection plane perpendicular to the thickness direction of the plate body (21), the ratio of the projection area of ​​the plurality of vent holes (23) to the projection area of ​​the plate body (21) is 0.3-0.

7.

14. The battery cell according to claim 9, characterized in that: In the second direction, among the plurality of support ribs (22), two support ribs (22) located on both sides of the air guide plate (20) in the second direction are respectively flush with the edges of both sides of the plate body (21) in the second direction.

15. The battery cell according to claim 9, characterized in that: In the thickness direction of the plate body (21), the thickness of the supporting rib (22) is 2 mm-4 mm.

16. The battery cell according to claim 9, characterized in that: The support rib (22) and the plate body (21) are integrally formed, or the support rib (22) and the plate body (21) are separate parts, and the support rib (22) and the plate body (21) are connected by hot melting.

17. The battery cell according to claim 1, characterized in that: The air guide plate (20) is a polypropylene piece.

18. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 17.

19. An electrical equipment, characterized in that: Comprising a battery according to claim 18.

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