End cover assembly, battery monomer, battery device and electric equipment

Abstract

The utility model discloses an end cover assembly, a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly and the end cover assembly, one end of the shell is opened; the electrode assembly is arranged in the shell; the end cover assembly covers the opening of the shell and comprises a cover body, an insulating part and a filtering structure; the cover body is positioned on one side of the insulator back to the electrode assembly; the cover body is provided with a liquid injection hole, and the insulating part is provided with a liquid passing hole communicated with the liquid injection hole; the filtering structure is arranged on the side, back to the cover body, of the insulating part and is configured to filter liquid flowing in from the liquid passing hole. The filtering structure is provided with a plurality of pores, the pores are communicated to form a plurality of filtering flow channels, and at least part of the filtering flow channels are communicated in a crossed manner. According to the technical scheme, in the liquid injection process of the battery monomer, the possibility that particle foreign matters enter the battery monomer along with the electrolyte can be reduced, and meanwhile, the possibility that the electrolyte causes impact damage to the electrode assembly is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to an end cover assembly, a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] The battery monomer in the related art comprises a shell, an electrode assembly and an end cover assembly, the electrode assembly is arranged in the shell, and the end cover assembly covers the shell. Meanwhile, the end cover assembly is provided with a liquid injection hole for injecting electrolyte into the shell.

[0003] However, in the process of injecting electrolyte into the battery monomer, there is a risk that particulate foreign matter enters the battery monomer along with the electrolyte. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a battery monomer, which aims to reduce the possibility of particulate foreign matter entering the battery monomer along with the electrolyte in the process of injecting electrolyte.

[0005] To achieve the above purpose, the battery monomer provided by the present application comprises:

[0006] The shell is provided with an opening at one end in the first direction;

[0007] The electrode assembly is arranged in the shell; and

[0008] The end cover assembly covers the opening of the shell, and the end cover assembly comprises a cover body, an insulating piece and a filter structure;

[0009] The cover body and the insulating piece are stacked in the first direction, and the cover body is located on the side of the insulating piece away from the electrode assembly; the cover body is provided with a liquid injection hole, and the insulating piece is provided with a liquid passing hole communicating with the liquid injection hole;

[0010] The filter structure is arranged on the side of the insulating piece away from the cover body and is configured to filter the liquid flowing into the liquid passing hole; the filter structure is provided with a plurality of pores, the plurality of pores are communicated and configured as a plurality of filter flow channels, and at least part of the filter flow channels are cross communicated.

[0011] The battery cell of the present application is provided with a filter structure on the side of the insulating piece of the end cover assembly facing away from the cover body, the filter structure is provided with a plurality of filter flow channels formed by a plurality of intercommunicating apertures, and at least part of the filter flow channels are cross-communicated, so that when liquid injection is performed on the battery cell from the liquid injection hole, the liquid injected from the liquid injection hole can enter each filter flow channel of the filter structure through the liquid hole. At this time, the particulate impurities mixed in the electrolyte can be intercepted by each aperture in the filter flow channel, thereby achieving the filtering effect on the electrolyte and reducing the possibility of particulate impurities entering the battery cell along with the electrolyte. At the same time, the filter flow channel adopts the form of apertures and is cross-communicated at least in part, so that the electrolyte can also disperse the impact force of the electrolyte when passing through, thereby reducing the possibility of impact damage to the electrode assembly. Therefore, the filter structure in the battery cell in the present scheme has both filtering and dispersing effects, so as to reduce the entry of particulate impurities and reduce the impact on the electrode assembly during the liquid injection process.

[0012] In some embodiments, the filter structure comprises a plurality of connected framework units, the framework units being provided with a plurality of apertures;

[0013] At least part of the apertures in the same framework unit are cross-communicated, and adjacent framework units are connected by part of the apertures.

[0014] In this way, the porosity of the filter structure can be improved, so as to improve the filtering effect and dispersing effect on the electrolyte, and the liquid injection efficiency can also be taken into account.

[0015] In some embodiments, the plurality of apertures in the framework unit comprises:

[0016] a first aperture; and

[0017] a plurality of second apertures, the plurality of second apertures being distributed on different sides of the framework unit, the first aperture being located between the plurality of second apertures and being in communication with each second aperture, and adjacent framework units being connected by the second apertures.

[0018] In this way, the number of filter flow channels formed by the framework units can be increased, and the filtering effect, dispersing effect and liquid injection efficiency on the electrolyte can be improved.

[0019] In some embodiments, the framework unit comprises a plurality of ribs, the plurality of ribs being arranged to form the first aperture and the plurality of second apertures, and adjacent framework units sharing the ribs at the connection.

[0020] In this way, the proportion of the ribs in the framework unit can be reduced, and the porosity of the framework unit can be further improved.

[0021] In some embodiments, the plurality of framework units are arranged in a rectangular array on a plane intersecting a first direction to form a unit layer; the filter structure comprises a plurality of unit layers, and the plurality of unit layers are arranged and disposed in sequence corresponding to the first direction;

[0022] Therefore, the manufacturing convenience of the filter structure can be improved.

[0023] In some embodiments, the plurality of skeleton units are arranged in a disordered manner.

[0024] Therefore, the filter flow channel is arranged more richly and complexly, the electrolyte can flow through the filter structure sufficiently, and the filtering effect and dispersion effect of the filter structure on the electrolyte are improved.

[0025] In some embodiments, the filter structure is provided with an expansion groove on the side facing the insulating member, the groove opening of the expansion groove is communicated with the liquid passing hole, and part of the pores are communicated with the expansion groove.

[0026] Therefore, the contact area of the filter structure with the electrolyte is increased, and then the electrolyte can enter the filter channels in the filter structure through different pores on the groove wall of the expansion groove, and the filtering effect, dispersion effect and liquid injection efficiency of the filter structure on the electrolyte are improved.

[0027] In some embodiments, the cross-sectional area of the expansion groove is arranged to decrease in the direction of the cover body facing the insulating member.

[0028] Therefore, the electrolyte can be buffered and accumulated after entering the expansion groove, so as to fully utilize each pore on the groove wall of the expansion groove.

[0029] In some embodiments, the liquid passing hole is arranged as a circular hole, and the groove wall of the expansion groove is configured as a curved surface.

[0030] Therefore, the electrolyte can be more uniformly dispersed in each horizontal circumferential direction, and the dispersion effect of the electrolyte is improved.

[0031] In some embodiments, the liquid passing hole, the expansion groove and the center line of the filter structure coincide, and in the projection plane perpendicular to the first direction, the area of the expansion groove is defined as S1, the area of the filter structure is defined as S2, and the relationship 10≤S2 / S1≤15 is satisfied.

[0032] Therefore, the electrolyte can be sufficiently filtered and dispersed on each side of the filter structure in the circumferential direction, and then the filtering effect and dispersion effect of the electrolyte are improved.

[0033] In some embodiments, the minimum distance between the groove wall of the expansion groove and the side of the filter structure opposite to the insulating member is defined as D1, and the relationship 1mm≤D1≤5mm is satisfied.

[0034] Therefore, the manufacturing convenience and the compactness of the structure can be considered.

[0035] In some embodiments, the filter structure is a 3D printed structure.

[0036] Therefore, the convenience of manufacturing the filtering process is improved.

[0037] In some embodiments, the material of the filtering structure is polyethylene terephthalate or polycarbonate.

[0038] And / or, the filtering structure and the insulating piece are an integral structure.

[0039] Therefore, the service life of the filtering structure can be improved by setting the material of the filtering structure, and 3D printing is also facilitated, improving the convenience of manufacturing the filtering structure. The filtering structure and the insulating piece are set as an integral structure, so that no connecting structure needs to be provided for the two, and the stability of the connection of the two is improved.

[0040] The application also provides an end cover assembly, comprising:

[0041] A cover body is provided with a liquid injection hole.

[0042] An insulating piece is stacked with the cover body in a first direction and is provided with a liquid passing hole communicating with the liquid injection hole; and

[0043] A filtering structure is provided on the side of the insulating piece opposite to the cover body and is configured to filter the liquid flowing into the liquid passing hole; the filtering structure is provided with a plurality of pores, the plurality of pores are communicated and configured as a plurality of filtering flow channels, and at least part of the filtering flow channels are cross-communicated.

[0044] Therefore, the filtering structure has filtering and dispersing effects at the same time, so as to reduce the entry of particulate foreign matter and reduce the impact on the electrode assembly during the liquid injection process.

[0045] In some embodiments, the filtering structure comprises a plurality of connected framework units, and the framework units are provided with a plurality of pores.

[0046] The plurality of pores in the framework unit comprises:

[0047] A first hole; and

[0048] A plurality of second holes, the plurality of second holes are distributed on different sides of the framework unit, the first hole is located between the plurality of second holes and communicates with each second hole, and adjacent framework units are communicated through the second holes.

[0049] Therefore, the number of filtering flow channels formed by the framework units can be increased, and the filtering effect, dispersing effect and liquid injection efficiency of the electrolyte are improved.

[0050] In some embodiments, the filtering structure is provided with an expansion groove on the side facing the insulating piece; the groove opening of the expansion groove is communicated with the liquid passing hole, and part of the pores are communicated with the expansion groove.

[0051] And / or, the filtering structure is a 3D printed structure.

[0052] Therefore, the expansion tank can increase the contact area between the filter structure and the electrolyte, thus facilitating the electrolyte to enter the various filter channels in the filter structure through different pores on the tank wall, thereby improving the filtration effect, dispersion effect and injection efficiency of the filter structure for the electrolyte; and setting the filter structure as a 3D printed structure is beneficial to improving the convenience of filter processing and manufacturing.

[0053] This application also proposes a battery device, comprising:

[0054] Battery box; and

[0055] The aforementioned battery cells are housed within the battery case.

[0056] This application also proposes an electrical device that includes the aforementioned battery cell or battery assembly. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0059] Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this application;

[0060] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of this application;

[0061] Figure 4 This is a schematic diagram of the assembly structure of the end cap assembly according to some embodiments of this application;

[0062] Figure 5 This is a cross-sectional schematic diagram of an end cap assembly according to some embodiments of this application;

[0063] Figure 6 This is a partial structural schematic diagram of the filter structure of the end cap assembly in some embodiments of this application;

[0064] Figure 7 for Figure 6 A schematic diagram of the skeleton unit of the filter structure;

[0065] Figure 8A partial structural schematic view of a filter structure of an end cover assembly of some embodiments of the present application;

[0066] Figure 9 A partial structural schematic view of a filter structure of some embodiments of the present application; Figure 8 A partial structural schematic view of a filter structure of some embodiments of the present application;

[0067] BRIEF DESCRIPTION OF DRAWINGS

[0068] 1000, vehicle; 100, battery device; 1, battery box; 11, upper cover; 12, box body; 1a, accommodating cavity; 2, battery pack; 20, battery cell; 21, end cover assembly; 21a, electrode terminal; 211, cover body; 211a, liquid injection hole; 213, insulating piece; 213a, liquid passing hole; 215, filter structure; 215a, pore; 215b, filter flow channel; 215c, first hole; 215d, second hole; 2151, skeleton unit; 2152, unit layer; 2153, rib; 215e, expansion groove; 22, shell; 23, electrode assembly; 231, tab; 200, controller; 300, motor.

[0069] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0071] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0072] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In addition, the description herein involving "first", "second", and the like is only for the purpose of description, and cannot be understood as indicating or implying relative importance of the technical features indicated, or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions, for example, "A and / or B" includes A solution, or B solution, or A and B solutions at the same time. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0074] Battery devices, that is, devices for storing electrical energy, are not only widely used in energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles, rail trains and other electric vehicles and other fields.

[0075] Among them, the battery device can include a battery box and a battery monomer arranged in the battery box. The battery box can include a box body and a box cover covering the box body to form a receiving cavity for receiving the battery monomer. The battery monomer is the smallest unit of the battery, which usually includes a shell, an end cover assembly and an electrode assembly. The shell can be provided with an opening at one end, the electrode assembly can be arranged in the shell, and the end cover assembly can cover the opening of the shell and be provided with a liquid injection hole for injecting electrolyte into the shell. The electrode assembly is the component that actually occurs electrochemical reaction in the battery monomer, which can include a positive plate, a negative plate and a separator between the two, and is formed by winding or laminating the positive plate, the negative plate and the separator. Among them, the battery monomer can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. In addition, the battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes. In addition, a plurality of battery monomers can be arranged in the battery box, which can be connected in series, connected in parallel, or connected in a mixed connection mode including series connection and parallel connection.

[0076] In the production process of the battery monomer, electrolyte needs to be injected. Since the liquid injection hole on the end cover assembly is opposite to the electrode assembly in the shell, when the electrolyte is injected from the liquid injection hole, the following disadvantages exist: on the one hand, there is a risk that particulate foreign matter will enter the battery monomer along with the electrolyte; on the other hand, the injection pressure of the electrolyte is large, which may cause impact damage to the electrode assembly.

[0077] Therefore, based on the above considerations, in order to solve the problem that in the current battery monomer, the particulate foreign matter is easy to follow into and the electrode assembly is easy to be damaged by the impact of the electrolyte during the liquid injection process, the application provides a new battery monomer. The battery monomer innovatively sets a filter structure below the insulating part in the end cover assembly, the filter structure is set to form a filter flow channel through a plurality of pores, and at least part of the filter flow channel is cross-connected, so as to play a filtering and dispersing role on the injected electrolyte through the filter structure, reduce the possibility of foreign matter entering the battery monomer with the electrolyte, and reduce the possibility of electrolyte impacting and damaging the electrode assembly.

[0078] In addition, it should be further pointed out that the end cover assembly provided by the application can be applied to a battery monomer, and of course can also be applied to other products that need to be injected.

[0079] In addition, the battery monomer provided by the application can be directly applied to an electric device to provide power for the electric device. Of course, it can also be applied to a battery device and then further applied to an electric device to provide power for the electric device. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric car, an electric automobile, a rail train, a ship, a spacecraft, etc. Further, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0080] The following embodiments are described for convenience with a vehicle as an example of an electric device of an embodiment of the application.

[0081] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example: the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example: for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0082] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Please refer to Figure 2 and Figure 3 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 includes battery cells 20. In the battery device 100, the battery cells 20 can be at least two, and the at least two battery cells 20 can be connected in series or in parallel or in a mixed connection to form a battery pack 2. The mixed connection means that there are both series and parallel connections among the plurality of battery cells 20. The battery device 100 can further include a battery box 1 for providing a containing space for the battery cells 20. The battery box 1 can adopt various structures. In some embodiments, the battery box 1 can include an upper cover 11 and a box body 12 that are covered with each other to jointly define a receiving cavity 1a for containing the battery cells 20. The upper cover 11 and the box body 12 can be hollow structures each having an open side, and the open side of the upper cover 11 covers the open side of the box body 12. Of course, the battery box 1 formed by the upper cover 11 and the box body 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0084] The battery device 100 can further include other structures, for example, the battery device 100 can further include a busbar component for realizing electrical connection between the plurality of battery cells 20.

[0085] Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0086] Please refer to Figure 2 and Figure 3 , Figure 3 An exploded structural schematic view of the battery cell 20 is provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery device 100. As shown in Figure 3 , the battery cell 20 includes an end cover assembly 21, a shell 22, an electrode assembly 23 and other functional components.

[0087] The end cover assembly 21 refers to a component that covers the opening of the shell 22 at one end to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover assembly 21 can be adapted to the shape of the shell 22 to fit the shell 22. The end cover assembly 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cover assembly 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0088] The shell 22 is an assembly for fitting the end cover assembly 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 and the end cover assembly 21 can be independent components, and an opening can be provided on the shell 22, and the end cover assembly 21 is covered on the opening to form the internal environment of the battery cell 20. Without limitation, the end cover assembly 21 and the shell 22 can also be integrated, specifically, the end cover assembly 21 and the shell 22 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 22, the end cover assembly 21 is covered on the shell 22. The shell 22 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0089] The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained in the shell 22. The electrode assembly 23 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting the main body of the electrode assembly 23, and the positive and negative electrode sheets each have a portion without active material constituting the tab 231. The positive and negative tabs can be located at one end of the main body or at both ends of the main body, respectively. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tab 231 is connected to the electrode terminal 21a to form a current loop.

[0090] Next, the structure of the end cover assembly 21 proposed in the present application will be explained and described in embodiments:

[0091] Please refer to Figure 4 and Figure 5In an embodiment of the present application, the end cover assembly 21 comprises a cover body 211, an insulating member 213, and a filter structure 215. The cover body 211 and the insulating member 213 are stacked in the first direction, and the cover body 211 is located on the side of the insulating member 213 away from the electrode assembly 23. The cover body 211 is provided with a liquid injection hole 211a, and the insulating member 213 is provided with a liquid passage hole 213a in communication with the liquid injection hole 211a. The filter structure 215 is arranged on the side of the insulating member 213 away from the cover body 211, and is configured to filter the liquid flowing into the liquid passage hole 213a. The filter structure 215 is provided with a plurality of apertures 215a, and the plurality of apertures 215a are in communication and configured as a plurality of filter flow channels 215b. At least part of the filter flow channels 215b are in cross communication.

[0092] The cover body 211 can be made of a material with high hardness and strength, such as copper, iron, aluminum, stainless steel, or aluminum alloy, to enhance the overall strength of the end cover assembly 21, thereby preventing deformation and damage of the end cover assembly 21 when subjected to extrusion and impact. At the same time, the cover body 211 can also be used to provide the liquid injection hole 211a for the injection of electrolyte into the casing 22 of the battery monomer 20. The shape of the liquid injection hole 211a can be circular, square, rectangular, or oval. The shape of the liquid injection hole 211a can be one, two, or more, and the present application does not limit the shape and number of the liquid injection hole 211a. In addition, the functional components of the electrode terminal 21a and the pressure relief mechanism described above can also be provided on the cover body 211.

[0093] The insulating member 213 can be stacked with the cover body 211 in a first direction. The first direction is the direction in which the opening of the shell 22 of the battery cell 20 faces. For example, when the opening of the shell 22 of the battery cell 20 faces upward in the first direction, the cover body 211 can be stacked with the insulating member 213 in the direction from top to bottom, so that the insulating member 213 is located between the cover body 211 and the electrode assembly 23, so as to isolate the electrode assembly 23 from the cover body 211 and reduce the risk of short circuit. The material of the insulating member 213 can be plastic or rubber or other material with insulation. In addition, the shape of the insulating member 213 can be consistent with the shape of the cover body 211. For example, the projection of the cover body 211 and the insulating member 213 on the projection plane perpendicular to the first direction can be rectangular. In addition, the liquid passing hole 213a provided on the insulating member 213 can be used for the electrolyte injected from the liquid injection hole 211a to pass through. The projection of the liquid passing hole 213a on the projection plane perpendicular to the first direction can coincide with the projection of the liquid injection hole 211a; of course, the projection of the liquid injection hole 211a can be located inside the liquid passing hole 213a. When the projection of the liquid injection hole 211a is located inside the liquid passing hole 213a, the shape of the liquid injection hole 211a and the shape of the liquid passing hole 213a can be the same, of course, they can also be different.

[0094] The filter structure 215 can be arranged below the insulating member 213 and cover at least part of the liquid passage hole 213a, so that the electrolyte flowing in from the liquid passage hole 213a can enter the filter structure 215 and then flow out of the filter structure 215 into the shell 22. The filter structure 215 can be provided with a plurality of apertures 215a, and the plurality of apertures 215a are in communication to form a plurality of filter flow channels 215b. The inlets of the filter flow channels 215b can be located on the side of the filter structure 215 facing the insulating member 213, and the outlets can be located on at least one of the other sides of the filter structure. That is, the apertures 215a can be arranged on the side of the filter structure 215 opposite the liquid passage hole 213a and at least one of the other sides. In addition, at least part of the filter flow channels 215b are in cross communication, which means that all of the filter flow channels 215b can be in cross communication, or part of the filter flow channels 215b can be in cross communication, and the filter flow channels 215b in the other part can be arranged independently, that is, not in communication with other flow channels. Therefore, each aperture 215a can be part of a filter flow channel 215b, or can be part of two or more filter flow channels 215b. In addition, cross communication means that at least part of the segments of two or more filter flow channels 215b can intersect at an acute angle, a right angle, or an obtuse angle at a certain position, so that the electrolyte can be distributed into different filter flow channels 215b at the cross communication position of the filter flow channels 215b, thereby dispersing the impact force of the electrolyte. In addition, each filter flow channel 215b can be arranged in a linear, curved, or zigzag manner, or in a combination of at least two of the above manners, and the application does not limit the extension shape of the filter flow channel 215b. In addition, the apertures 215a can be circular or polygonal, and the application does not limit the shape of the apertures 215a. In addition, the apertures 215a can be arranged in an ordered manner, such as a circular array or a rectangular array, or can be arranged in a disordered manner. In addition, the shapes and sizes of the apertures 215a can be the same or different. In addition, the filter structure 215 can be a block structure as described below, or can be a cylindrical structure with one end open, and the opening can be arranged to face the liquid passage hole 213a, or can be a spherical structure, and the application does not limit the shape of the filter structure 215. In addition, the filter structure 215 and the insulating member 213 can be an integral structure, that is, they are prepared by integral molding, or can be a separate structure and then connected by any connection method such as adhesive connection or snap connection.

[0095] The battery cell 20 of the present application is provided with a filter structure 215 on the side of the insulating piece 213 of the end cover assembly 21 which is opposite to the cover body 211. The filter structure 215 is provided with a plurality of filter flow channels 215b which are communicated by a plurality of apertures 215a, and at least part of the filter flow channels 215b are cross communicated. When the battery cell 20 is injected with electrolyte through the injection hole 211a, the electrolyte injected through the injection hole 211a can enter the filter flow channels 215b of the filter structure 215 through the liquid hole 213a. At this time, the particulate impurities mixed in the electrolyte can be intercepted by the apertures 215a in the filter flow channels 215b, thereby achieving the filtering effect on the electrolyte and reducing the possibility of the particulate impurities entering the battery cell 20 along with the electrolyte. Meanwhile, the filter flow channels 215b are formed by the apertures 215a and at least part of them are cross communicated, so that the electrolyte can also be dispersed when passing through, thereby reducing the possibility of impact damage to the electrode assembly 23. Therefore, the filter structure 215 in the battery cell 20 of the present application has both filtering and dispersing effects, so as to reduce the entry of particulate impurities and the impact on the electrode assembly 23 during the injection process.

[0096] Please refer to Figure 6 and Figure 7 In an embodiment of the present application, the filter structure 215 comprises a plurality of connected framework units 2151, and the framework units 2151 are provided with a plurality of apertures 215a. At least part of the apertures 215a in the same framework unit 2151 are cross communicated, and adjacent framework units 2151 are communicated through part of the apertures 215a.

[0097] The framework unit 2151 can be a spherical body, a trihedral, a tetrahedron or a more faceted body, and the shape of the framework unit 2151 is not limited in the present application. The framework unit 2151 can be formed by surrounding a plurality of ribs 2153 as described below, or can be formed by surrounding a plurality of thin walls, and the structure type of the framework unit 2151 is not limited in the present application. In addition, the plurality of framework units 2151 can be arranged in an ordered manner, or can be arranged in an unordered manner. Furthermore, at least part of the apertures 215a in the same framework unit 2151 are cross communicated, which means that all the apertures 215a in the same framework unit 2151 can be cross communicated, or part of the apertures 215a can be cross communicated, and the apertures 215a in another part are independently arranged, i.e. not communicated with other apertures 215a. In addition, adjacent framework units 2151 are communicated through part of the apertures 215a, which means that adjacent framework units 2151 can be communicated through the apertures 215a at the connection. Moreover, the framework unit 2151 can be communicated with part of the adjacent framework units 2151, or can be communicated with all the adjacent framework units 2151.

[0098] In the embodiment, the filter structure 215 includes the skeleton units 2151, and a plurality of pores 215a are arranged on the skeleton units 2151, so that the filter structure 215 can be fully utilized to form more pores 215a. At this time, the porosity of the filter structure 215 can be improved to improve the filtering effect and dispersion effect on the electrolyte, and the liquid injection efficiency can also be considered.

[0099] For reference Figure 6 and Figure 7 In an embodiment of the present application, the plurality of pores 215a in the skeleton unit 2151 include a first hole 215c and a plurality of second holes 215d; the plurality of second holes 215d are distributed on different sides of the skeleton unit 2151, the first hole 215c is located between the plurality of second holes 215d and communicates with each second hole 215d, and adjacent skeleton units 2151 communicate through the second holes 215d.

[0100] The first hole 215c can be located in the middle of the skeleton unit 2151, and the plurality of second holes 215d can be located at the edges of the skeleton unit 2151 and surround the first hole 215c. In addition, adjacent skeleton units 2151 communicate through the second holes 215d, which means that in the two adjacent skeleton units 2151, the second holes 215d can be shared to realize the communication between the two, and of course, the second holes 215d can also be respectively provided to realize the communication between the two through the corresponding second holes 215d. In addition, the shape of each second hole 215d can be the same, and of course, the shape can also be different, and the shape can be circular or polygonal, for example.

[0101] In the embodiment, the plurality of pores 215a in the skeleton unit 2151 are arranged to include the first hole 215c and the plurality of second holes 215d, and the first hole 215c is located between the plurality of second holes 215d and communicates with each second hole 215d, so that the number of filter flow channels 215b formed by the skeleton unit 2151 can be increased, and the filtering effect, dispersion effect and liquid injection efficiency on the electrolyte can be improved.

[0102] For reference Figure 6 and Figure 7 In an embodiment of the present application, the skeleton unit 2151 includes a plurality of ribs 2153, and the plurality of ribs 2153 are arranged to form the first hole 215c and the plurality of second holes 215d.

[0103] In the embodiment, the skeleton unit 2151 is arranged to include a plurality of ribs 2153, and the ribs 2153 are used to enclose the pores 215a, so that the proportion of the ribs 2153 in the skeleton unit 2151 can be reduced, and the porosity of the skeleton unit can be further improved. The adjacent skeleton units 2151 can share the ribs 2153 at the connection, so that the second holes 215d in the adjacent two skeleton units 2151 can be shared to realize the communication between the two, so as to improve the compactness between the skeleton units 2151 and improve the porosity of the filter structure 215.

[0104] Please refer to Figure 6 In an embodiment of the present application, the plurality of skeleton units 2151 are arranged in disorder, so that the plurality of pores 215a and the formed filter flow channels 215b can be correspondingly arranged in disorder, forming a more complex filter flow channel 215b, realizing the sufficient flow of the electrolyte in the filter structure 215, and improving the filtering effect and dispersion effect.

[0105] Of course, the present application is not limited to this, in order to improve the convenience of manufacturing the filter structure 215, in an embodiment of the present application, the plurality of skeleton units 2151 can be arranged in a rectangular array on a plane intersecting the first direction, to configure a unit layer 2152; the filter structure 215 includes a plurality of unit layers 2152, and the plurality of unit layers 2152 are arranged in sequence along the first direction.

[0106] In addition, in some embodiments, please refer to Figure 8 and Figure 9 The skeleton unit 2151 can also be arranged as a solid structure, and the pores 215a are enclosed by the gaps between the adjacent skeleton units 2151. At this time, the structural strength of the skeleton unit 2151 can be enhanced, and the service life of the filter structure 215 can be improved.

[0107] Please refer to Figure 5 In an embodiment of the present application, the filter structure 215 is provided with an expansion groove 215e on the side facing the insulating piece 213; the slot of the expansion groove 215e is communicated with the liquid inlet hole 213a, and part of the pores 215a are communicated with the expansion groove 215e.

[0108] The expansion groove 215e can be arranged on the upper surface of the filter structure 215, wherein the expansion groove 215e can be a cube, a cuboid, a sphere or other shapes. In addition, part of the pores 215a can be arranged on the groove wall of the expansion groove 215e, so that part of the pores 215a can be communicated with the expansion groove 215e.

[0109] In the embodiment, the electrolyte flowing into the liquid passing hole 213a can be received by the expansion groove 215e, so as to increase the contact area between the filter structure 215 and the electrolyte, and then facilitate the electrolyte to enter into each filter channel in the filter structure 215 through different apertures 215a on the groove wall of the expansion groove 215e, and improve the filtering effect, dispersion effect and liquid injection efficiency of the filter structure 215 on the electrolyte.

[0110] It should be noted that Figure 5 In an embodiment of the present application, the cross-sectional area of the expansion groove 215e decreases in the direction of the cover body 211 facing the insulating member 213.

[0111] In the embodiment, the cross-sectional area of the upper end of the expansion groove 215e is greater than that of the lower end, so that the electrolyte can be buffered and accumulated after entering the expansion groove 215e, so as to fully utilize each aperture 215a on the groove wall of the expansion groove 215e.

[0112] It should be noted that Figure 5 In an embodiment of the present application, the liquid passing hole 213a is a circular hole, and the groove wall of the expansion groove 215e is a curved surface.

[0113] In the embodiment, the liquid passing hole 213a is set as a circular hole, and the groove wall of the expansion groove 215e is a curved surface, so that the electrolyte can be more uniformly dispersed in the horizontal circumferential direction, and the dispersion effect of the electrolyte is improved. At the same time, such a structure can also simplify the structure of the liquid passing hole 213a and the expansion groove 215e, and improve the manufacturing convenience.

[0114] In an embodiment of the present application, the center lines of the liquid passing hole 213a, the expansion groove 215e and the filter structure 215 coincide, and in the projection plane perpendicular to the first direction, the area of the expansion groove 215e is defined as S1, and the area of the filter structure 215 is defined as S2, and the relationship 10≤S2 / S1≤15 is satisfied.

[0115] In the embodiment, the center of the liquid passing hole 213a and the expansion groove 215e corresponds to the center of the filter structure 215, and the ratio of the area S2 of the filter structure 215 to the area S1 of the expansion groove 215e is set to 10 to 15, so that the filter structure 215 can fully filter and disperse the electrolyte on each side in the circumferential direction, thereby improving the filtering effect and dispersion effect of the electrolyte. The ratio of S2 to S1 can be 10, 11, 12, 13, 14 or 15, and of course can also be any value in the above range. In addition, it should be noted that in other embodiments, the center lines of the liquid passing hole 213a, the expansion groove 215e and the filter structure 215 can also be misaligned, as long as the projection of the liquid passing hole 213a is located in the expansion groove 215e in the projection plane perpendicular to the first direction.

[0116] Please refer to Figure 5 In an embodiment of the present application, the minimum distance between the groove wall of the expansion groove 215e and the side of the filter structure 215 opposite to the insulating member 213 is defined as D1, which satisfies the relationship: 1mm≤D1≤5mm.

[0117] In the present embodiment, the minimum distance D1 between the groove wall of the expansion groove 215e and the side of the filter structure 215 opposite to the insulating member 213 is set to 1mm to 5mm, so that the wall thickness of the filter structure 215 at this position is not too thin to cause inconvenience in processing the corresponding pores 215a, nor too thick to cause a large occupation of the space in the shell 22, thereby balancing the manufacturing convenience and structural compactness. The value of D1 can be 1mm, 2mm, 3mm, 4mm or 5mm, or any value within the above range.

[0118] In an embodiment of the present application, the filter structure 215 is a 3D printed structure.

[0119] In the present embodiment, the filter structure 215 can be manufactured by 3D printing technology, such as 3D powder printing or 3D wire material, and the 3D printing technology can print various structural complex objects, thereby facilitating the convenience of manufacturing and processing the filter. Of course, the present application is not limited thereto, and in other embodiments, the filter structure 215 can be mixed with base material powder and foaming agent, then pressed and molded and heated, and the foaming agent decomposes to generate gas to form pores 215a. The present application does not limit the manufacturing method of the filter structure 215.

[0120] In an embodiment of the present application, the material of the filter structure 215 is polyethylene terephthalate or polycarbonate.

[0121] In the present embodiment, the material of the filter structure 215 is set to polyethylene terephthalate or polycarbonate, which can have good corrosion resistance to electrolyte, thereby improving the service life of the filter structure 215; at the same time, it is convenient for 3D printing, thereby facilitating the convenience of manufacturing the filter structure 215. Of course, in other embodiments, the material of the filter structure 215 can also be polyether ether ketone or polycyclohexane dicarboxylate, etc., which is not limited by the present application.

[0122] In an embodiment of the present application, the filter structure 215 and the insulating member 213 are an integrally formed structure.

[0123] In the present embodiment, the filter structure 215 and the insulating member 213 are set as an integrally formed structure, so that no connecting structure needs to be provided between the two, thereby improving the manufacturing efficiency; at the same time, the stability of the connection between the two can also be improved.

[0124] Please refer to Figure 4 to Figure 7 In an embodiment of the present application, the end cover assembly 21 comprises a cover body 211, an insulating piece 213, and a filter structure 215; the cover body 211 and the insulating piece 213 are stacked in the first direction, and the cover body 211 is located on the side of the insulating piece 213 away from the electrode assembly 23; the cover body 211 is provided with a liquid injection hole 211a, and the insulating piece 213 is provided with a liquid passage hole 213a in communication with the liquid injection hole 211a; the filter structure 215 is arranged on the side of the insulating piece 213 away from the cover body 211 and is configured to filter the liquid flowing into the liquid passage hole 213a; the filter structure 215 is provided with a plurality of pores 215a, and the plurality of pores 215a are connected in the form of a plurality of filter flow channels 215b, and at least part of the filter flow channels 215b are cross-connected. The filter structure 215 comprises a plurality of connected framework units 2151, and the framework units 2151 are provided with a plurality of pores 215a; at least part of the pores 215a in the same framework unit 2151 are cross-connected, and adjacent framework units 2151 are connected through part of the pores 215a. The plurality of pores 215a in the framework unit 2151 comprise a first hole 215c and a plurality of second holes 215d; the plurality of second holes 215d are distributed on different sides of the framework unit 2151, the first hole 215c is located between the plurality of second holes 215d and is in communication with each second hole 215d, and adjacent framework units 2151 are connected through the second holes 215d. The framework unit 2151 comprises a plurality of ribs 2153, and the plurality of ribs 2153 are arranged in the form of the first hole 215c and the plurality of second holes 215d, and adjacent framework units 2151 share the ribs 2153 at the connection. The plurality of framework units 2151 are arranged in a disordered manner. The filter structure 215 is provided with an expansion groove 215e on the side facing the insulating piece 213; the groove of the expansion groove 215e is in communication with the liquid passage hole 213a, and part of the pores 215a are in communication with the expansion groove 215e. In the direction of the cover body 211 facing the insulating piece 213, the cross-sectional area of the expansion groove 215e is arranged in a decreasing manner. The liquid passage hole 213a is arranged in the form of a circular hole, and the groove wall of the expansion groove 215e is located on the same curved surface. The center lines of the liquid passage hole 213a, the expansion groove 215e, and the filter structure 215 coincide, and in the projection plane intersecting the first direction, the area of the expansion groove 215e is defined as S1, and the area of the filter structure 215 is defined as S2, and the relationship satisfies: 10≤S2 / S1≤15. The minimum distance between the groove wall of the expansion groove 215e and the side of the filter structure 215 away from the insulating piece 213 is defined as D1, and the relationship satisfies: 1mm≤D1≤5mm. The filter structure 215 is a 3D printing structure. The material of the filter structure 215 is polyethylene terephthalate or polycarbonate; the filter structure 215 and the insulating piece 213 are an integral molding structure.

[0125] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery cover assembly. The battery cover assembly comprises: a shell, one end of which is open in a first direction; an electrode assembly arranged in the shell; and a cover assembly covering the opening of the shell, the cover assembly comprising a cover body, an insulating member and a filter structure. The cover body and the insulating member are arranged in a stack in the first direction, and the cover body is located on the side of the insulating member away from the electrode assembly; the cover body is provided with a liquid injection hole, and the insulating member is provided with a liquid passing hole in communication with the liquid injection hole; the filter structure is arranged on the side of the insulating member away from the cover body and is configured to filter liquid flowing into the liquid passing hole; the filter structure is provided with a plurality of pores, and the plurality of pores are arranged in communication to form a plurality of filter flow channels, and at least part of the filter flow channels are cross-connected.

2. The battery cell of claim 1, wherein, The filter structure comprises a plurality of connected framework units, and the framework units are provided with a plurality of pores; at least part of the pores in the same framework unit are cross-connected, and adjacent framework units are connected through part of the pores.

3. The battery cell of claim 2, wherein, The plurality of pores in the framework unit comprises: a first hole; and a plurality of second holes, the plurality of second holes are distributed on different sides of the framework unit, the first hole is located between the plurality of second holes and is in communication with each second hole, and adjacent framework units are connected through the second holes.

4. The battery cell of claim 3, wherein, The framework unit comprises a plurality of ribs, and the plurality of ribs are arranged to form the first hole and the plurality of second holes, and adjacent framework units share the ribs at the connecting positions.

5. The battery cell of claim 2, wherein the cathode comprises a lithium metal oxide. The plurality of framework units are arranged in a rectangular array on a plane intersecting the first direction to form a unit layer; the filter structure comprises a plurality of unit layers, and the plurality of unit layers are arranged in correspondence along the first direction; alternatively, the plurality of framework units are arranged in disorder.

6. The battery cell according to any one of claims 1 to 5, wherein The filter structure is provided with an expansion groove on the side facing the insulating member, the groove opening of the expansion groove is in communication with the liquid passing hole, and part of the pores are in communication with the expansion groove.

7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. In the direction of the cover body facing the insulating member, the cross-sectional area of the expansion groove is arranged to decrease.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The liquid passing hole is arranged in a circular hole, and the groove wall of the expansion groove is configured as a curved surface.

9. The battery cell as described in claim 6, characterized in that, The liquid passing hole, the expansion groove and the center line of the filter structure coincide, and in a projection plane perpendicular to the first direction, the area of the expansion groove is defined as S1, and the area of the filter structure is defined as S2, and the relationship satisfies 10<=S2 / S1<=15.

10. The battery cell as described in claim 6, characterized in that, The minimum distance between the groove wall of the expansion groove and the side of the filter structure away from the insulating member is defined as D1, and the relationship satisfies 1mm<=D1<=5mm.

11. The battery cell according to any one of claims 1 to 5, wherein The filter structure is a 3D printing structure.

12. The battery cell of claim 11, wherein, The material of the filter structure is polyethylene terephthalate or polycarbonate; and / or, the filter structure and the insulating member are integrally formed.

13. An end cap assembly characterized by, The battery cover assembly comprises: a cover body provided with a liquid injection hole; an insulating member arranged in a stack with the cover body in a first direction and provided with a liquid passing hole in communication with the liquid injection hole; and ​ A filter structure is arranged on a side of the insulating member opposite to the cover body, and is configured to filter liquid flowing into the liquid passage; The filter structure is provided with a plurality of pores, and the plurality of pores are communicatively arranged as a plurality of filter flow channels, and at least part of the filter flow channels are cross-communicatively arranged.

14. The end cap assembly of claim 13, wherein, The filter structure comprises a plurality of connected framework units, and the framework units are provided with a plurality of pores; The plurality of pores in the framework units comprise: First pores; and A plurality of second pores, the plurality of second pores are distributed on different sides of the framework units, the first pores are located between the plurality of second pores and are in communication with each of the second pores, and adjacent framework units are in communication through the second pores.

15. An end cap assembly as claimed in claim 13 or 14, wherein, The filter structure is arranged in a block shape and is provided with a volume expansion groove on a side facing the insulating member; an opening of the volume expansion groove is in communication with the liquid passage, and part of the pores are in communication with the volume expansion groove; And / or, the filter structure is a 3D printed structure.

16. A battery device characterized by comprising: Comprise: A battery box; and A battery cell as claimed in any one of claims 1 to 12, the battery cell being arranged in the battery box. Comprise a battery cell as claimed in any one of claims 1 to 12, or comprise a battery device as claimed in claim 16.

17. An electrical device, characterized by ​

Images