End cover assembly of battery monomer, battery monomer, battery and power utilization device

Abstract

The utility model provides an end cover assembly of a single battery, the single battery, a battery and a power utilization device, the end cover assembly comprises an end cover and an insulating part, the end cover is provided with a liquid injection hole, the insulating part comprises a main body part and an abutting part which are connected with each other, the main body part is stacked on the surface of the end cover, and the abutting part is located on the side, away from the end cover, of the main body part; the abutting part is used for abutting and limiting a pole piece of the battery monomer, and the liquid injection hole and the abutting part are arranged at an interval along a first direction; the abutting part is provided with a flow channel, and the two end faces, in the first direction, of the abutting part are communicated through the flow channel. According to the structure, the electrolyte injected from the liquid injection hole can flow between the two sides of the first direction of the propping part through the flow channel, so that the electrolyte injected from the liquid injection hole can be quickly diffused in the battery monomer, and liquid overflowing or liquid spraying is not easy to occur, so that the liquid injection of the battery monomer is convenient and quick, and the production efficiency of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an end cover assembly of a battery cell, a battery cell, a battery and an electrical device. Background Art

[0002] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric tools, etc.

[0003] As the application scope of batteries continues to expand, the market demand for batteries is also increasing. How to improve the convenience of battery production and improve the production efficiency of batteries has attracted more and more attention from technicians in this field. Utility Model Content

[0004] In view of the above problems, the present application provides an end cover assembly of a battery cell, a battery cell, a battery and an electrical device. The end cover assembly of the battery cell facilitates the injection of liquid into the battery cell, which is beneficial to improving the production efficiency of the battery cell.

[0005] In a first aspect, some embodiments of the present application provide an end cap assembly of a battery cell, comprising an end cap and an insulating member, wherein the end cap is provided with an injection hole, and the insulating member comprises a main body portion and a supporting portion which are connected to each other, wherein the main body portion is superimposed on the surface of the end cap, and the supporting portion is located on a side of the main body portion away from the end cap, and the supporting portion is used to support and limit the pole piece of the battery cell, and the injection hole and the supporting portion are spaced apart along a first direction; the supporting portion is provided with a flow channel, and the flow channel connects the two end surfaces of the supporting portion in the first direction.

[0006] Through the above structure, the electrolyte injected from the injection hole can flow between the two sides of the first direction of the supporting part through the flow channel, so that the electrolyte injected from the injection hole can quickly diffuse in the battery cell, and overflow or spraying is not likely to occur, making the injection of the battery cell convenient and fast, which is conducive to improving the production efficiency of the battery cell.

[0007] According to the end cover assembly provided in some embodiments of the present application, the flow channel includes a through groove, the groove opening of the through groove is oriented away from the main body, and the through groove connects the two end surfaces of the abutting portion in the first direction, so that the flow channel can connect the two sides of the abutting portion in the first direction through the through groove.

[0008] According to the end cap assembly provided in some embodiments of the present application, the extension direction of the through slot intersects with the first direction, so that when the electrolyte flows through the through slot, the electrolyte can flow over a longer distance, so that the electrolyte has a better wetting effect on the electrode.

[0009] According to the end cover assembly provided in some embodiments of the present application, in a first direction, the projections of the openings of the through slots at the two end surfaces in the first direction are separated, so that the pole piece can be supported by the material between the through slots, making it difficult for the pole piece to fall into the through slots, and the pole piece in the cavity can be supported and limited by the supporting portion, which can reduce the misalignment of the pole piece caused by the movement of the pole piece, and is beneficial to improving the reliability of the battery cell.

[0010] According to the end cover assembly provided in some embodiments of the present application, a plurality of through grooves are provided, and the plurality of through grooves are spaced apart along a second direction, and the second direction is perpendicular to the first direction, so that the flow channel formed by the plurality of through grooves can allow the electrolyte to flow more smoothly, making it less likely for the electrolyte to overflow or spray during the injection process.

[0011] According to the end cover assembly provided in some embodiments of the present application, the flow channel includes a through hole, and the through hole connects the two end surfaces of the abutment portion in the first direction, so that the flow channel can connect the two sides of the abutment portion in the first direction through the through hole.

[0012] According to the end cap assembly provided in some embodiments of the present application, the end cap assembly of the battery cell further includes a stopper connected to the main body, the stopper is located on the side of the main body away from the end cap and corresponds to the injection hole, the stopper is provided with a drainage hole, and the drainage hole is connected to the injection hole. The stopper can insert the sealing nail into the appropriate depth, reduce the possibility of the sealing nail being inserted too deep, and is conducive to improving the sealing performance of the sealing nail to the injection hole; the stopper is provided with a drainage hole, so that the electrolyte can flow through the injection hole and the drainage hole in sequence into the cavity.

[0013] According to the end cover assembly provided in some embodiments of the present application, at least two drainage holes are provided, and the at least two drainage holes are arranged at intervals along the circumference of the injection hole, so that the electrolyte injected from the injection hole can flow into the cavity quickly and evenly through the at least two drainage holes, which can not only reduce the impact of the electrolyte on the electrode assembly, but also enable the electrolyte to flow smoothly into the cavity.

[0014] According to the end cover assembly provided in some embodiments of the present application, the end cover is provided with a pressure relief hole, which is arranged opposite to the supporting portion in the thickness direction of the end cover, and the pressure relief hole is connected with the flow channel, so that the pressure relief hole can be smoothly connected with the cavity of the battery cell, thereby facilitating the discharge of the discharged material in the cavity.

[0015] According to the end cover assembly provided in some embodiments of the present application, a cavity is provided in the supporting portion, and the pressure relief hole is connected to the flow channel through the cavity, which can reduce the resistance of the discharged material flowing from the flow channel into the pressure relief hole and improve the smoothness of the pressure relief.

[0016] According to the end cap assembly provided in some embodiments of the present application, the end cap is provided with two electrode lead-out holes, and the two electrode lead-out holes are respectively located on both sides of the supporting portion in the first direction, which is beneficial to making the structural strength distribution of the end cap more uniform.

[0017] In a second aspect, some embodiments of the present application provide a battery cell, which includes the end cover assembly of the battery cell provided by any of the above technical solutions.

[0018] In a third aspect, some embodiments of the present application provide a battery, which includes a battery cell provided by the above technical solution.

[0019] In a fourth aspect, some embodiments of the present application provide an electrical device, which includes a battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0020] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0021] Some embodiments of the present application provide an end cap assembly of a battery cell, the end cap assembly includes an end cap and an insulating member, the end cap is provided with an injection hole, the insulating member includes a main body and a supporting portion connected to each other, the main body is stacked on the surface of the end cap, the supporting portion is located on a side of the main body away from the end cap, the supporting portion is used to support and limit the pole piece of the battery cell, the injection hole and the supporting portion are spaced apart along a first direction; the supporting portion is provided with a flow channel, and the flow channel connects the two end surfaces of the supporting portion in the first direction. Through the above structure, the electrolyte injected from the injection hole can flow between the two sides of the supporting portion in the first direction through the flow channel, so that the electrolyte injected from the injection hole can quickly diffuse in the battery cell, and it is not easy to overflow or spray, so that the injection of the battery cell is convenient and fast, which is conducive to improving the production efficiency of the battery cell.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0024] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0025] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0026] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0027] Figure 4 A bottom view of an end cap assembly provided for some embodiments of the present application;

[0028] Figure 5 A schematic diagram of the structure of an end cap assembly provided in some embodiments of the present application;

[0029] Figure 6 A bottom view of an end cap assembly provided in some other embodiments of the present application;

[0030] Figure 7 A schematic diagram of the structure of an end cover assembly provided in some further embodiments of the present application;

[0031] Figure 8 Schematic diagram of the structure of the end cover assembly provided in other embodiments of the present application.

[0032] In the attached picture:

[0033] 1. End cap assembly; 11. End cap; 111. Liquid injection hole; 112. Pressure relief hole; 113. Electrode lead-out hole; 12. Insulator; 121. Main body; 122. Abutment; 1220. Flow channel; 1221. Through groove; 1222. Through hole; 1223. Cavity; 13. Stopper; 131. Bottom wall; 132. Side wall; 1321. Liquid discharge hole; 2. Shell; 10. Box; 101. First box; 102. Second box; 20. Battery cell; 201. Electrode assembly; 202. Shell; 203. Receptacle; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application 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 application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0036] In the description of the embodiments of the present application, 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", "clockwise", "counterclockwise", "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 application 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 should not be understood as a limitation on the embodiments of the present application.

[0037] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] In the description of the embodiments of the present application, 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, and 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 application can be understood according to the specific circumstances.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. 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.

[0041] The battery mentioned in the embodiments of the present application includes one or more battery modules. The battery module refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0042] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0043] The battery cells may be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0044] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0045] In some embodiments, the electrode assembly is a wound structure or a laminated structure. Optionally, the electrode assembly is a cylindrical wound structure.

[0046] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film. The housing includes a shell and an end cap, the shell is formed with a receiving space having an opening, the receiving space is used to receive components such as the electrode assembly and the electrolyte, and the end cap covers the opening of the receiving space and is sealed and connected to the shell.

[0047] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0048] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module, and the multiple battery cells are connected in series, in parallel or in mixed connection. Mixed connection means that the multiple battery cells are connected in both series and in parallel.

[0049] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0050] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0051] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0052] In the related art, the end cap is usually provided with an insulating structure protruding toward the accommodation space, and the insulating structure can support and limit the pole piece. However, the existence of the insulating structure makes it difficult for the electrolyte to diffuse during the injection process, and the electrolyte is prone to overflow or spray, which not only makes the injection of the battery cell inconvenient, but also is not conducive to improving the injection efficiency.

[0053] In order to facilitate the injection of battery cells and improve the production efficiency of battery cells, some embodiments of the present application provide an end cap assembly of a battery cell, which includes an end cap and an insulating member, the end cap is provided with an injection hole, the insulating member includes a main body and a supporting portion that are connected to each other, the main body is stacked on the surface of the end cap, the supporting portion is located on the side of the main body away from the end cap, the supporting portion is used to support and limit the pole piece of the battery cell, the injection hole and the supporting portion are spaced along the first direction; the supporting portion is provided with a flow channel, and the flow channel connects the two end surfaces of the supporting portion in the first direction. Through the above structure, the electrolyte injected from the injection hole can flow between the two sides of the supporting portion in the first direction through the flow channel, so that the electrolyte injected from the injection hole can quickly diffuse in the battery cell, and it is not easy to overflow or spray, so that the injection of the battery cell is convenient, which is conducive to improving the production efficiency of the battery cell.

[0054] The end cap assembly of the battery cell described in the embodiment of the present application is applicable to the battery cell, the battery and the electrical device using the battery. The battery cell can be used for, but not limited to, batteries, and can also be used for vehicles, aircraft, ships, electronic equipment, electric tools and other products, which can improve the reliability of these products.

[0055] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0057] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0058] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Please refer to Figure 2 , Figure 2 An exploded diagram of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20. There may be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the housing 10.

[0060] The box 10 may include a first box 101 and a second box 102, and the first box 101 and the second box 102 cover each other to define a placement space for accommodating the battery cells 20. The first box 101 and the second box 102 may be in various shapes, such as a cuboid, a cylinder, etc. The first box 101 may be a hollow structure with one side open, and the second box 102 may also be a hollow structure with one side open, and the open side of the second box 102 covers the open side of the first box 101, thereby forming a box 10 with a placement space.

[0061] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0062] Each battery cell 20 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 20 may be cylindrical, flat, rectangular, or in other shapes.

[0063] In some embodiments of the present application, Figure 3 As shown, the battery cell 20 includes a housing 202 and an electrode assembly 201, and the electrode assembly 201 is accommodated in the housing 202. The housing 202 may be a wall structure arranged at the periphery of the battery cell 20, which can form a cavity 203 for accommodating other components of the battery cell 20 such as the electrode assembly 201 and an electrolyte. The electrode assembly 201, as a component accommodated in the housing 202, is in contact with the electrolyte, and active ions (such as lithium ions) can be conducted between the electrode assembly 201 and the electrolyte.

[0064] The housing 202 includes an end cover assembly 1 and a shell 2. The shell 2 has an opening, and the end cover 11 covers the opening.

[0065] Some embodiments of the present application provide an end cap assembly 1 of a battery cell 20, such as Figure 4 As shown, the end cover assembly 1 includes an end cover 11 and an insulating member 12. The end cover 11 is provided with a liquid injection hole 111. The insulating member 12 includes a main body 121 and a supporting portion 122 that are connected to each other. The main body 121 is stacked on the surface of the end cover 11. The supporting portion 122 is located on a side of the main body 121 away from the end cover 11. The supporting portion 122 is used to support and limit the pole piece of the battery cell 20. The liquid injection hole 111 and the supporting portion 122 are spaced apart along the first direction X; the supporting portion 122 is provided with a flow channel 1220, and the flow channel 1220 connects the two end surfaces of the supporting portion 122 in the first direction X.

[0066] The end cap 11 may be a component in the end cap assembly 1 for covering the opening of the shell 2, and the end cap 11 and the shell 2 together form a cavity 203 for accommodating components such as the electrode assembly 201 and the electrolyte. Exemplarily, the end cap 11 may be connected to the opening of the shell 2 by welding, so that the materials of the end cap 11 and the shell 2 are melted together, which is beneficial to improve the sealing of the battery cell 20.

[0067] The injection hole 111 can be a hole-like structure for injecting electrolyte into the cavity 203 of the battery cell 20. It is opened on the end cover 11 and penetrates the inside and outside of the battery cell 20 along the thickness direction of the end cover 11, so that the injection equipment can inject liquid from the outside of the battery cell 20 into the cavity 203.

[0068] The insulating member 12 may be a component disposed on the surface of the end cap 11 facing the cavity 203, and is used to isolate the electrode terminal from the end cap 11. The main body 121 may be a main structure in the insulating member 12, which is superimposed on the surface of the end cap 11 facing the cavity 203, and integrally covers the surface of the end cap 11 facing the cavity 203, so as to reduce the possibility of contact between the electrode terminal and the end cap 11. The abutting portion 122 may be a structure in the insulating member 12 for abutting against the pole piece in the cavity 203, and is connected to the main body 121. By disposing the abutting portion 122 on the side of the main body 121 away from the end cap 11, the abutting portion 122 can extend into the cavity 203, so as to abut and limit the pole piece in the cavity 203.

[0069] By arranging the supporting portion 122 to be spaced apart from the injection hole 111 along the first direction X, not only can the obstruction of the electrolyte by the supporting portion 122 be reduced, but also the possibility of interference between the supporting portion 122 and the portion of the injection device extending into the injection hole 111 can be reduced, thereby reducing the influence of the supporting portion 122 on the injection.

[0070] The flow channel 1220 may be a channel provided on the abutting portion 122 for the electrolyte to flow through. By making the flow channel 1220 connect the two end surfaces of the abutting portion 122 in the first direction X, the electrolyte can flow between the two sides of the abutting portion 122 in the first direction X, so that the electrolyte can be well diffused in the cavity 203.

[0071] The first direction X may be set as a direction perpendicular to the thickness direction of the end cover 11 .

[0072] Exemplarily, the flow channel 1220 may include a hole-like structure provided on the abutting portion 122, and the hole-like structure may connect the two end surfaces of the abutting portion 122 in the first direction X, so that the flow channel 1220 can connect the two sides of the abutting portion 122 in the first direction X; the flow channel 1220 may also include a groove structure provided on the abutting portion 122, and the groove structure may connect the two end surfaces of the abutting portion 122 in the first direction X, so that the flow channel 1220 can connect the two sides of the abutting portion 122 in the first direction X. Those skilled in the art may set the form of the flow channel 1220 according to actual conditions, as long as the flow channel 1220 can connect the two end surfaces of the abutting portion 122 in the first direction X.

[0073] Through the above structure, the electrolyte injected from the injection hole 111 can flow between the two sides of the first direction X of the supporting portion 122 through the flow channel 1220, so that the electrolyte injected from the injection hole 111 can quickly diffuse in the battery cell 20, and it is not easy to overflow or spray, which makes the injection of the battery cell 20 convenient, which is beneficial to improving the production efficiency of the battery cell 20.

[0074] In some embodiments, the insulating member 12 may be made of plastic material, so that the insulating member 12 has good insulation. For example, the insulating member 12 may be made of polypropylene, polyethylene or polyamide.

[0075] In some embodiments, the main body 121 and the abutting portion 122 are integrally formed structures. The main body 121 and the abutting portion 122 can be made by an integral forming processing method such as injection molding, so that the insulating member 12 can be manufactured as a whole synchronously, which not only makes the processing and manufacturing of the insulating member 12 convenient, but also makes the overall structure of the insulating member 12 have good strength.

[0076] In some embodiments, Figure 5 As shown, the flow channel 1220 includes a through groove 1221 , the notch of the through groove 1221 is oriented away from the main body 121 , and the through groove 1221 is connected to both end surfaces of the supporting portion 122 in the first direction X.

[0077] The through groove 1221 may be a groove that is provided on the abutting portion 122 and passes through the abutting portion 122 along its own extension direction. By providing the through groove 1221 on the surface of the abutting portion 122 away from the main body 121, the notch of the through groove 1221 is oriented away from the main body 121, and the notch of the through groove 1221 is oriented toward the direction where the pole piece in the cavity 203 is located, so that the electrolyte can also infiltrate the pole piece during the process of flowing through the through groove 1221, which is conducive to improving the infiltration effect of the electrolyte.

[0078] By connecting the through groove 1221 to both end surfaces of the abutting portion 122 in the first direction X, the flow channel 1220 can connect both sides of the abutting portion 122 in the first direction X through the through groove 1221 .

[0079] In some embodiments, Figure 6 As shown, the extending direction of the through slot 1221 intersects with the first direction X.

[0080] By arranging the extension direction of the through slot 1221 to intersect with the first direction X, the electrolyte can flow through a longer distance when flowing through the through slot 1221, so that the electrolyte has a better wetting effect on the electrode.

[0081] In some embodiments, in the first direction X, projections of openings of two end surfaces of the through slot 1221 in the first direction X are separated.

[0082] Since the length direction of the pole piece in the cavity 203 of the battery cell 20 usually extends along the first direction X, the projections of the openings of the two end surfaces of the through groove 1221 in the first direction X are separated from each other, so that the pole piece can be supported by the material between the through groove 1221, making it difficult for the pole piece to fall into the through groove 1221, and the pole piece in the cavity 203 can be supported and limited by the supporting portion 122, which can reduce the pole piece misalignment caused by the movement of the pole piece, which is beneficial to improving the reliability of the battery cell 20.

[0083] In some embodiments, a plurality of through slots 1221 are provided, and the plurality of through slots 1221 are spaced apart along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0084] By providing a plurality of through grooves 1221 and arranging the plurality of through grooves 1221 at intervals along the second direction Y on the supporting portion 122 , the plurality of through grooves 1221 can allow the electrolyte to flow more smoothly, making it less likely for the electrolyte to overflow or spray during the injection process.

[0085] Exemplarily, the plurality of through grooves 1221 are arranged at equal intervals on the abutting portion 122 , so that the electrolyte flows through the abutting portion 122 more evenly through the flow channel 1220 .

[0086] The second direction Y, the first direction X and the thickness direction of the end cover 11 are perpendicular to each other.

[0087] In some embodiments, Figure 7 As shown, the flow channel 1220 includes a through hole 1222 , and the through hole 1222 is connected to both end surfaces of the supporting portion 122 in the first direction X.

[0088] The through hole 1222 may be a hole-like structure formed on the abutting portion 122 and extending in the direction of its own extension. By connecting the through hole 1222 to both end surfaces of the abutting portion 122 in the first direction X, the flow channel 1220 can connect the two sides of the abutting portion 122 in the first direction X through the through hole 1222.

[0089] Exemplarily, the through hole 1222 may be configured as a square hole or a round hole, and those skilled in the art may set it according to actual conditions.

[0090] In some embodiments, the end cap assembly 1 of the battery cell 20 further includes a stopper 13 connected to the main body 121 . The stopper 13 is located on a side of the main body 121 away from the end cap 11 . The stopper 13 is provided with a drainage hole 1321 , which is connected to the injection hole 111 .

[0091] After the electrolyte injection is completed, the injection hole 111 needs to be sealed with a sealing nail. The stopper 13 can be a component that blocks and limits the sealing nail during the process of inserting the sealing nail into the injection hole 111. The stopper 13 can make the sealing nail be inserted into the appropriate depth, reduce the possibility of the sealing nail being inserted too deep, and help improve the sealing performance of the sealing nail to the injection hole 111.

[0092] By making the blocking member 13 face the injection hole 111 along the thickness direction of the end cover 11 and being disposed on a side of the main body 121 away from the end cover 11 , the sealing pin can limit the depth of the sealing pin extending into the cavity 203 .

[0093] Exemplarily, the blocking member 13 includes a bottom wall 131 and a side wall 132, wherein the bottom wall 131 is spaced apart from the main body 121, and the side wall 132 is connected between the main body 121 and the bottom wall 131. The drainage hole 1321 may be a hole-shaped structure provided on the side wall 132, which is used for the electrolyte to flow through, and the drainage hole 1321 connects the injection hole 111 with the cavity 203, so that the electrolyte can flow through the injection hole 111 and the drainage hole 1321 in sequence and enter the cavity 203.

[0094] In some embodiments, the blocking member 13 and the insulating member 12 can be integrally formed by an injection molding process, which is helpful to simplify the processing steps of the end cover assembly 1 and improve production efficiency.

[0095] In some embodiments, at least two drainage holes 1321 are provided, and the at least two drainage holes 1321 are spaced apart along the circumference of the injection hole 111 .

[0096] By opening at least two drainage holes 1321 on the side wall 132, and at least two drainage holes 1321 are arranged at equal intervals along the circumference of the bottom wall 131, the electrolyte injected from the injection hole 111 can flow into the cavity 203 quickly and evenly through the at least two drainage holes 1321, which can not only reduce the impact of the electrolyte on the electrode assembly 201, but also enable the electrolyte to flow smoothly into the cavity 203.

[0097] In some embodiments, the end cover 11 is provided with a pressure relief hole 112 , which is arranged opposite to the abutting portion 122 in the thickness direction of the end cover 11 , and the pressure relief hole 112 is communicated with the flow channel 1220 .

[0098] The pressure relief hole 112 may be a through hole 1222 structure that connects the cavity 203 inside the battery cell 20 with the outside world, and is used to discharge the released substances to the outside when the pressure inside the cavity 203 rises above a preset value due to thermal runaway of the battery cell 20 to reduce the pressure in the cavity 203 .

[0099] For example, the pressure relief hole 112 can be formed by machining processes such as milling and drilling, or can be made simultaneously with the end cover 11 by an integral molding process such as stamping.

[0100] The pressure relief hole 112 is arranged opposite to the abutting portion 122 in the thickness direction of the end cover 11, so that the pressure relief hole 112 can be arranged at a position of the end cover assembly 1 with better structural strength, thereby reducing the possibility of local low strength of the end cover assembly 1 due to the arrangement of the pressure relief hole 112.

[0101] By connecting the pressure relief hole 112 with the flow channel 1220 , the pressure relief hole 112 can be smoothly connected with the receiving cavity 203 of the battery cell 20 , so that the discharged substances in the receiving cavity 203 can be discharged easily.

[0102] In some embodiments, Figure 8 As shown, a cavity 1223 is provided in the abutting portion 122 , and the pressure relief hole 112 is connected to the flow channel 1220 through the cavity 1223 .

[0103] By opening the cavity 1223 in the abutting portion 122 , the pressure relief hole 112 is connected to the flow channel 1220 through the cavity 1223 , which can reduce the resistance of the discharged material flowing from the flow channel 1220 into the pressure relief hole 112 and improve the smoothness of pressure relief.

[0104] Exemplarily, the cavity 1223 may be formed simultaneously with the abutting portion 122 through an injection molding process, which is beneficial for improving the convenience of molding the cavity 1223 .

[0105] In some embodiments, the end cover 11 is provided with two electrode lead-out holes 113 , and the two electrode lead-out holes 113 are respectively located on two sides of the supporting portion 122 in the first direction X.

[0106] The electrode lead-out hole 113 may be a through hole 1222 structure opened on the end cover 11, which is used to set the electrode terminal. The electrode lead-out hole 113 can communicate with the cavity 203 inside the battery cell 20, so that the electrode terminal can be electrically connected to the electrode assembly 201 in the cavity 203. Exemplarily, the electrode lead-out hole 113 can be formed by machining processes such as milling and drilling, or can be made simultaneously with the end cover 11 by an integrated molding process such as stamping.

[0107] By locating the two electrode lead-out holes 113 on both sides of the supporting portion 122 in the first direction X, the structure of the end cover 11 is symmetrically distributed, which is conducive to making the structural strength distribution of the end cover 11 more uniform.

[0108] Some embodiments of the present application further provide a battery cell 20, wherein the battery cell 20 includes the end cover assembly 1 of the battery cell 20 provided by any of the above technical solutions.

[0109] Some embodiments of the present application further provide a battery 100 , which includes a battery cell 20 provided by the above technical solution.

[0110] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0111] Some embodiments of the present application provide an end cap assembly 1 of a battery cell 20, such as Figure 8 As shown, the end cap assembly 1 comprises an end cap 11 and an insulating member 12. The end cap 11 is provided with a liquid injection hole 111, a pressure relief hole 112 and two electrode lead-out holes 113. The main body 121 of the insulating member 12 is superimposed on the surface of the end cap 11 facing the cavity 203, and the abutting portion 122 is convexly arranged on the side of the main body 121 away from the end cap 11. The abutting portion 122 is provided with a plurality of through grooves 1221 as flow channels 1220. The through grooves 1221 are connected to the two end surfaces of the abutting portion 122 in the first direction X. The notches of the through grooves 1221 are arranged away from the main body 121. The extending direction of the through grooves 1221 intersects with the first direction X, and the projections of the openings of the through grooves 1221 at the two end surfaces in the first direction X in the first direction X are separated, so that the electrode piece is not easy to be inserted into the through grooves 1221, and the abutting portion 122 can abut and limit the electrode piece. Through the above structure, the electrolyte injected from the injection hole 111 can flow between the two sides of the first direction X of the supporting portion 122 through the flow channel 1220 formed by the through groove 1221, so that the electrolyte injected from the injection hole 111 can quickly diffuse in the battery cell 20, and overflow or spraying is not likely to occur, making the injection of the battery cell 20 convenient and fast, which is beneficial to improving the production efficiency of the battery cell 20.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application 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 application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An end cap assembly of a battery cell, characterized in that: include: An end cover having a liquid injection hole; The insulating member includes a main body and a supporting portion that are connected to each other, wherein the main body is stacked on the surface of the end cover, the supporting portion is located on a side of the main body away from the end cover, and the supporting portion is used to support and limit the pole piece of the battery cell, and the injection hole and the supporting portion are spaced apart along a first direction; the supporting portion is provided with a flow channel, and the flow channel connects the two end surfaces of the supporting portion in the first direction.

2. The end cap assembly of the battery cell according to claim 1, characterized in that: The flow channel includes a through groove, a notch of which faces away from the main body, and the through groove is connected to both end surfaces of the abutting portion in the first direction.

3. The end cap assembly of the battery cell according to claim 2, characterized in that: An extending direction of the through slot intersects with the first direction.

4. The end cap assembly of the battery cell according to claim 3, characterized in that: In the first direction, projections of openings of the through slot at both end surfaces in the first direction are separated from each other.

5. The end cap assembly of the battery cell according to claim 2, characterized in that: There are a plurality of through slots, and the plurality of through slots are spaced apart along a second direction, and the second direction is perpendicular to the first direction.

6. The end cap assembly of the battery cell according to claim 1, characterized in that: The flow channel includes a through hole, and the through hole communicates with both end surfaces of the abutting portion in the first direction.

7. The end cap assembly of the battery cell according to claim 1, characterized in that: The end cap assembly of the battery cell also includes a stopper connected to the main body, the stopper is located on a side of the main body away from the end cap and corresponds to the injection hole, and the stopper is provided with drainage holes, and the drainage holes are all connected to the injection hole.

8. The end cap assembly of the battery cell according to claim 7, characterized in that: At least two of the drainage holes are arranged at intervals along the circumference of the injection hole.

9. The end cap assembly of the battery cell according to claim 1, characterized in that: The end cover is provided with a pressure relief hole, the pressure relief hole is arranged opposite to the abutting portion in the thickness direction of the end cover, and the pressure relief hole is communicated with the flow channel.

10. The end cap assembly of the battery cell according to claim 9, characterized in that: The supporting portion is provided with a cavity, and the pressure relief hole is connected to the flow channel through the cavity.

11. The end cap assembly of the battery cell according to claim 1, characterized in that: The end cover is provided with two electrode lead-out holes, and the two electrode lead-out holes are respectively located on both sides of the supporting portion in the first direction.

12. A battery cell, characterized in that: An end cap assembly comprising a battery cell as claimed in any one of claims 1 to 11.

13. A battery, characterized in that: Comprising the battery cell as claimed in claim 12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

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