Battery monomer, battery and electric equipment

Abstract

The embodiment of the invention discloses a battery monomer, a battery and electric equipment. The battery cell includes: a first wall provided with a liquid injection hole; and the electrode assembly is a cylinder, and the axis of the electrode assembly coincides with the axis of the liquid injection hole. According to the battery monomer, the battery and the electric equipment provided by the embodiment of the invention, the liquid injection efficiency of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the rapid development of battery technology, how to improve the processing and production efficiency of batteries is a technical problem that needs to be solved in battery technology. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the liquid injection efficiency of the battery cell.

[0004] In a first aspect, a battery cell is provided, the battery cell comprising: a first wall, the first wall being provided with a liquid injection hole; an electrode assembly, the electrode assembly being a cylinder, the axis of the electrode assembly coincides with the axis of the liquid injection hole.

[0005] Therefore, in the battery cell of the embodiment of the present application, during the injection process, the electrolyte can be directed toward the central part of the electrode assembly through the injection hole instead of being directed toward the flattened area, thereby reducing obstruction to the electrolyte, improving the injection efficiency, and thus improving the processing efficiency of the battery cell, and reducing electrolyte splashing and reducing electrolyte contamination of the wall where the injection hole is located.

[0006] In some embodiments, the axis of the injection hole passes through the center of the first wall. The axis of the injection hole coincides with the axis of the electrode assembly. If the axis of the injection hole passes through the center of the first wall, the axis of the electrode assembly also passes through the center of the first wall, that is, the electrode assembly corresponds to the center position of the first wall, which is convenient for processing and assembly.

[0007] In some embodiments, the first wall is provided with an electrode terminal, and the injection hole penetrates the electrode terminal. Providing the injection hole to penetrate the electrode terminal can reduce the space of the first wall occupied by the electrode terminal and the injection hole, especially when the area of ​​the first wall is limited, can improve the structural integration, and the structure is simple and easy to implement.

[0008] In some embodiments, the electrode terminal includes a plurality of poles, the poles are used to be electrically connected to the pole tabs of the electrode assembly, and the injection hole is located between the plurality of poles. In this way, the plurality of poles have little impact on the injection hole, which is convenient for processing.

[0009] In some embodiments, the electrode terminal includes a rivet block, which is arranged on the outer side of the first wall, the first wall is provided with an electrode lead-out hole, the pole passes through the electrode lead-out hole and is riveted to the first wall through the rivet block, and the injection hole passes through the rivet block. The pole and the first wall can be fixed by the rivet block, and the structure is simple; in addition, the injection hole is arranged to pass through the electrode terminal, and specifically through the rivet block of the electrode terminal, which is easy to implement.

[0010] In some embodiments, the axis of the injection hole passes through the center of the riveted block. Since the axis of the injection hole coincides with the axis of the electrode assembly, and the axis of the injection hole passes through the center of the riveted block, the axis of the electrode assembly also passes through the center of the riveted block, and at least one pole fixed by the riveted block can correspond to the middle area of ​​the electrode assembly, which facilitates the electrical connection between the pole and the pole ear, and can improve the performance of the battery cell.

[0011] In some embodiments, the battery cell includes: a first insulating structure, the first insulating structure is located between the electrode terminal and the first wall, the first insulating structure is arranged outside the first wall, and the injection hole passes through the first insulating structure. The first insulating structure is arranged between the electrode terminal and the first wall so that the electrode terminal and the first wall are electrically insulated. In addition, the injection hole passes through the first insulating structure so that the first insulating structure does not hinder injection.

[0012] In some embodiments, the axis of the injection hole passes through the center of the first insulating structure. Since the axis of the injection hole coincides with the axis of the electrode assembly, the axis of the injection hole passes through the center of the first insulating structure, and the axis of the electrode assembly also passes through the center of the first insulating structure, correspondingly, the electrode terminal corresponding to the first insulating structure can correspond to the middle area of ​​the electrode assembly, which facilitates the electrical connection between the electrode terminal and the tab, and can improve the performance of the battery cell.

[0013] In some embodiments, the battery cell includes: a second insulating structure, the second insulating structure is located between the first wall and the electrode assembly, and the injection hole runs through the second insulating structure. On the one hand, the second insulating structure can electrically insulate the electrode terminal from the first wall, and on the other hand, the second insulating structure can also be used to support the first wall to improve the structural stability of the first wall.

[0014] In some embodiments, the axis of the injection hole passes through the center of the second insulating structure to facilitate processing.

[0015] In some embodiments, the battery cell includes: a connecting member for electrically connecting to the electrode terminal and the electrode tab of the electrode assembly respectively, the connecting member being provided with a through hole, wherein in the axial direction of the injection hole, the orthographic projection of the through hole at least partially overlaps with the orthographic projection of the injection hole.

[0016] During the injection process, the electrolyte is affected by gravity and usually enters the battery cell along the axial direction of the injection hole; therefore, in the axial direction of the injection hole, the orthographic projection of the through hole is set to at least partially overlap with the orthographic projection of the injection hole. Then, among the electrolyte passing through the injection hole, at least part of the electrolyte can directly pass through the through hole and quickly enter the battery cell, avoiding excessive electrolyte from flowing to other positions of the connecting component, which is more conducive to the rapid passage of the electrolyte through the injection hole and the through hole, thereby increasing the injection rate.

[0017] In some embodiments, the axis of the through hole coincides with the axis of the injection hole. There is no offset between the injection hole 215 and the through hole 2301 along the axis of the injection hole 215, so that more electrolyte can pass through the injection hole 215 and the through hole 2301 and enter the battery cell 20 more quickly, avoiding excessive electrolyte splashing to other locations, and further improving the injection rate.

[0018] In some embodiments, the connecting member includes a first part, a second part, and a third part stacked along the axial direction of the injection hole, the first part and the second part are connected by a first bending portion, the second part and the third part are connected by a second bending portion, the first part is electrically connected to the electrode terminal, and the third part is electrically connected to the electrode ear.

[0019] If the connecting member is set to a foldable structure, the surface area of ​​the connecting member is larger when it is unfolded, but the area occupied by the connecting member can be smaller after it is folded. In this way, when assembling the battery cell, the first part can be electrically connected to the electrode terminal provided on the cover plate, and then the third part can be electrically connected to the pole ear, and finally the connecting member can be folded to complete the assembly. Since the surface area of ​​the connecting member is larger when unfolded, when the third part is electrically connected to the pole ear, the first part is far away from the third part, and it is not easy to cause an impact on the electrode terminal and the cover plate; and the space occupied by the connecting member in the battery cell can be reduced by folding the connecting member.

[0020] In some embodiments, the first part is provided with a first hole, the second part is provided with a second hole, the third part is provided with a third hole, and the through hole includes the first hole, the second hole and the third hole. By forming a through hole together with the first hole, the second hole and the third hole, the first part, the second part and the third part can reduce the obstruction of the electrolyte, so that the electrolyte can smoothly pass through the connecting member into the electrode assembly, thereby improving the injection efficiency.

[0021] In some embodiments, the battery cell includes: a shell, which is a hollow structure with an opening; a cover plate, which is used to cover the opening of the shell, and the first wall is the cover plate to facilitate processing.

[0022] In some embodiments, the first wall is circular or rectangular to facilitate processing.

[0023] In a second aspect, a battery is provided, comprising: the battery cell described in the first aspect or any one embodiment of the first aspect.

[0024] In a third aspect, an electrical device is provided, comprising: a battery, the battery comprising a plurality of battery cells as described in the first aspect or any one embodiment of the first aspect, the battery being used to provide electrical energy to the electrical device.

[0025] In some embodiments, the electrical equipment is a vehicle, a ship or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a vehicle according to an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of a battery cell according to an embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0030] Figure 5 A schematic top view of a battery cell according to an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the structure of a battery cell according to another embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of the exploded structure of a battery cell according to another embodiment of the present application;

[0033] Figure 8 A schematic top view of a battery cell according to another embodiment of the present application;

[0034] Fig. 9 A partial cross-sectional schematic diagram of a battery cell according to another embodiment of the present application;

[0035] Fig.10 A schematic diagram of a partial structure of a battery cell according to another embodiment of the present application;

[0036] Fig.11 It is a schematic diagram of the partial structure of a battery cell according to another embodiment of the present application;

[0037] Fig.12 It is a schematic diagram of the partial structure of a battery cell according to an embodiment of the present application.

[0038] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0046] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0047] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0049] 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.

[0050] In some embodiments, the positive electrode may include a positive electrode sheet, and the positive electrode sheet may include a positive electrode collector and a positive electrode active material disposed on at least one surface of the positive electrode collector.

[0051] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0052] In some embodiments, the negative electrode may include a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0053] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0054] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0055] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0056] In some embodiments, the electrode assembly may be a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0057] In some embodiments, the electrode assembly may be a laminate structure.

[0058] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0059] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0060] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0061] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0062] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0063] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0064] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. 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 a cover plate.

[0065] As an example, the battery cell can 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, etc. There is no special limitation in this application.

[0066] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The outer shell of the battery cell is usually provided with an injection hole, through which the electrolyte is injected into the battery cell. In order to facilitate processing, the injection hole is usually provided on a wall of the battery cell together with other components. For example, the injection hole is usually located on the same wall as the electrode terminal or the pressure relief mechanism of the battery cell. Then, in order to avoid other components and avoid affecting other components, the location of the injection hole is very limited. For example, when the injection hole and the electrode terminal are set on the same wall, if there is an electrode terminal on the wall, the electrode terminal is usually located in the center position. If there are multiple electrode terminals on the wall, the multiple electrode terminals are usually symmetrically distributed relative to the center of the wall, and the injection hole is usually set at the edge of the wall to avoid affecting the electrode terminal. In addition, if the wall where the injection hole is located is also provided with a pressure relief mechanism, it is also necessary to consider avoiding the area where the pressure relief mechanism is located. Therefore, the location of the injection hole is very limited and is usually set at a specific position on the edge. When injecting liquid into a battery cell, for example, in the case of a battery cell with a cylindrical electrode assembly inside, when the injection hole is located at the edge, the injection hole usually also corresponds to the edge of the electrode assembly. However, when the lug of the cylindrical electrode assembly is processed, the edge of the end face where the lug is located is a flattened area. When the injection hole at the edge corresponds to the flattened area, the electrolyte entering the battery cell through the injection hole will be blocked by the lug, resulting in low injection efficiency. It can also cause electrolyte splashing during injection, contaminating the corresponding wall of the battery cell, such as the cover of the battery cell.

[0071] Based on this, the embodiment of the present application provides a battery cell, a battery and an electrical device, wherein the first wall of the battery cell is provided with an injection hole, and the axis of the cylindrical electrode assembly coincides with the axis of the injection hole. In this way, during the injection process of the battery cell, the electrolyte can be directed to the central part of the electrode assembly through the injection hole, and the electrolyte will not be directed to the flattened area, thereby reducing the obstruction of the electrolyte, improving the injection efficiency, and thus improving the processing efficiency of the battery cell, and reducing the splashing of the electrolyte and reducing the contamination of the wall where the injection hole is located by the electrolyte.

[0072] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0073] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. 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, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; 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, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0074] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0075] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0076] For example. Figure 2 FIG. 1 is a schematic diagram showing a partial structure of a battery 10 according to an embodiment of the present application. Figure 2As shown, the battery 10 of the embodiment of the present application may include a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application may be set according to the actual application. For example, the battery cell 20 may be as follows: Figure 2 The cylindrical shape shown, or it can also be different from Figure 2 The rectangular parallelepiped or other shapes shown are not limited to the embodiments of the present application.

[0077] It should be understood that Figure 2 As shown, the battery 10 of the embodiment of the present application may further include a box body 11, which may be used to accommodate a plurality of battery cells 20. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated inside. For example, they may be determined according to the shape of the combination of the plurality of battery cells 20 accommodated inside. At least one of the first box body part 111 and the second box body part 112 may have an opening. For example, as Figure 2 As shown, only one of the first box body 111 and the second box body 112 may be a hollow cuboid with an opening, while the other may be in the shape of a plate to cover the opening. Here, the second box body 112 is a hollow cuboid with an opening, and the first box body 111 is in the shape of a plate. Then, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box body 11 formed by the first box body 111 and the second box body 112 being buckled together.

[0078] For example, unlike Figure 2 As shown, the first box body portion 111 and the second box body portion 112 can also be hollow rectangular parallelepipeds and each has an open face, the opening of the first box body portion 111 and the opening of the second box body portion 112 are arranged opposite to each other, and the first box body portion 111 and the second box body portion 112 are interlocked to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0079] In some embodiments, the battery 10 may further include a busbar, which may be used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar may achieve electrical connection between the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20; or, the busbar may also achieve electrical connection between the battery cells 20 by connecting other components of the battery cells 20, for example, the busbar may be electrically connected to the sealing structure or housing of the battery cells 20, thereby achieving electrical connection between the battery cells 20. Furthermore, the busbar may be fixed to the corresponding components of the battery cells 20 by welding, for example, it may be fixed to the electrode terminals 214, the sealing structure, or the housing, etc. by welding, but the embodiments of the present application are not limited thereto.

[0080] Figure 3 A schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application is shown. Figure 4 The schematic diagram of the exploded structure of a battery cell 20 in an embodiment of the present application is shown. Figure 4 Can be Figure 3 FIG. 2 is a schematic diagram of at least a portion of the exploded structure of the battery cell 20 shown in FIG. Figure 3 to Figure 4 As shown, the battery cell 20 of the embodiment of the present application includes: a first wall 201 , which is provided with a liquid injection hole 215 ; an electrode assembly 22 , which is a cylinder, and the axis of the electrode assembly 22 coincides with the axis of the liquid injection hole 215 .

[0081] It should be understood that the injection hole 215 of the embodiment of the present application may be a through hole. For example, the injection hole 215 may be a through hole provided on the first wall 201 and passing through the first wall 201; or the injection hole 215 may also be provided on any component on the first wall 201 and pass through the component, and the embodiment of the present application is not limited thereto.

[0082] The battery cell 20 of the embodiment of the present application may include one or more electrode assemblies 22. The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. Figure 3 to Figure 4 As shown, the electrode assembly 22 of the embodiment of the present application may include a tab 222 and a main body 221, wherein the tab 222 of the electrode assembly 22 may include a positive tab and a negative tab, the positive tab may be formed by a portion of the positive electrode sheet that is not coated with a positive electrode active material layer, the negative tab may be formed by a portion of the negative electrode sheet that is not coated with a negative electrode active material layer, and the main body 221 is the portion of the electrode assembly 22 where active ions (such as lithium ions) are embedded and released back and forth between the positive electrode sheet and the positive electrode sheet. In addition, the two tabs 222 of the electrode assembly 22 may be located at different end faces of the electrode assembly 22, for example, as Figure 3 to Figure 4As shown, the embodiment of the present application takes the example that the two pole ears 222 of the electrode assembly 22 are respectively located at two oppositely disposed end surfaces.

[0083] It should be understood that the electrode assembly 22 of the embodiment of the present application is a cylinder, that is, the main body 221 of the electrode assembly 22 is a cylinder, and the tabs can be located on the two bottom surfaces of the cylinder. The axis of the cylindrical electrode assembly 22 of the embodiment of the present application is the straight line where the center of the two circular bottom surfaces of the cylinder are connected. For example, the embodiment of the present application mainly takes the direction of the axis of the electrode assembly 22 as an example parallel to the height direction X of the battery cell 20, and the height direction X of the battery cell 20 is also the height direction X of the electrode assembly 22.

[0084] The first wall 201 of the embodiment of the present application can be any wall of the battery cell 20, but since the first wall 201 is provided with an injection hole 215, and the axis of the injection hole 215 coincides with the axis of the electrode assembly 22, the first wall 201 where the injection hole 215 is located is a wall facing any one of the two bottom surfaces of the electrode assembly 22.

[0085] During the injection process of the battery cell 20 in the embodiment of the present application, the electrolyte can be aligned with the central part of the electrode assembly 22 through the injection hole 215, instead of being aligned with the flattened area, thereby reducing obstruction to the electrolyte, improving the injection efficiency, and thus improving the processing efficiency of the battery cell 20, and reducing electrolyte splashing and reducing electrolyte contamination of the wall where the injection hole 215 is located.

[0086] It should be understood that the battery cell 20 of the embodiment of the present application can be flexibly arranged according to the actual application, and the battery cell 20 can be of any shape. For example, the battery cell 20 can be an axisymmetric structure or a non-axisymmetric structure. For example, the battery cell 20 can be a prism to facilitate the assembly of multiple battery cells 20. For example, the battery cell 20 can be a straight prism or an oblique prism.

[0087] Furthermore, the shape of the outer shell 21 of the battery cell 20 may be the same as or different from the shape of the electrode assembly 22. For example, when the electrode assembly 22 of the embodiment of the present application is a cylinder, the outer shell 21 of the battery cell 20 may also be a cylindrical structure to increase the space occupancy rate of the electrode assembly 22 in the battery cell; or, the outer shell 21 of the battery cell 20 may also be a rectangular parallelepiped structure for easy processing. For ease of description, the embodiment of the present application is mainly described by taking the cylindrical outer shell 21 as an example, but the embodiment of the present application is not limited thereto.

[0088] In the embodiment of the present application, the shape of the first wall 201 of the embodiment of the present application can be flexibly set according to the actual application, that is, for battery cells 20 of different shapes, the shape of the first wall 201 is also different. For example, the first wall 201 is circular or rectangular for easy processing.

[0089] In some embodiments, the battery cell 20 of the embodiment of the present application includes: a housing 211, which is a hollow structure with an opening 2111; and a cover plate 212, which is used to cover the opening 2111 of the housing 211. The hollow structure in the housing 211 can be used to accommodate the electrode assembly 22, and the cover plate 212 covers the opening 2111 of the housing 211, so that the inside of the battery cell 20 can be isolated from the outside to avoid external influences.

[0090] The housing 211 of the embodiment of the present application may be a hollow structure including at least one opening 2111. Specifically, if the housing 211 is a hollow structure having one opening 2111, then the corresponding cover plate 212 may be provided as one to cover the one opening 2111 of the housing 211; if the housing 211 is a hollow structure having two openings 2111, for example, Figure 3 to Figure 4 As shown, the housing 211 has two openings 2111 arranged opposite to each other, and two cover plates 212 can be provided, and the two cover plates 212 cover the two openings 2111 of the housing 211 respectively.

[0091] The shell 211 may be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The shell 211 may be in any shape, such as a cylinder, a cuboid, etc. Figure 3 and Figure 4 In the figure, the shell 211 is a cylinder; illustratively, the shell 211 has two openings 2111, and the two openings 2111 are two opposite bottom surfaces of the shell 211. This structure with openings at both ends facilitates the assembly of the internal electrode assembly 22. The electrode assembly 22 can enter the shell 211 through any opening 2111, which can improve the processing efficiency of the battery cell 20.

[0092] The cover plate 212 of the embodiment of the present application is used to cover the opening 2111 of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The material of the cover plate 212 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 212 can be the same as or different from that of the housing 211.

[0093] It should be understood that the shape of the cover plate 212 can be adapted to the shape of the housing 211. For example, when the housing 211 is a rectangular parallelepiped structure, the cover plate 212 can be a plate-like structure with a rectangular surface adapted to the housing 211, or can be a hollow rectangular parallelepiped structure with one end open, so that the cover plate 212 and the housing 211 are covered to form a rectangular battery cell 20. For another example, Figure 3 to Figure 4 As shown, when the housing 211 is a cylinder, the cover plate 212 may also be a circular plate; or, different from Figure 3 and Figure 4 The cover plate 212 may also be a groove structure with a circular bottom wall, so that the cover plate 212 and the shell 211 are covered to form a cylindrical battery cell 20, but the embodiments of the present application are not limited thereto.

[0094] For example, for ease of description, the embodiment of the present application takes a cylindrical shell 211 as an example, and the two opposite bottom surfaces of the shell 211 have openings 2111; correspondingly, the two cover plates 212 respectively cover the two openings 2111. In some embodiments, the first wall 201 of the embodiment of the present application can be a cover plate 212, that is, any one of the two cover plates 212 included in the battery cell 20 can be provided with a liquid injection hole 215 for easy processing.

[0095] Figure 5 A schematic top view of a battery cell 20 according to an embodiment of the present application is shown. Figure 5 The battery cell 20 shown may be Figure 3 to Figure 4 The schematic top view of the battery cell 20 is shown in FIG. Figure 5 As shown, the axis of the injection hole 215 passes through the center of the first wall 201. For example, taking the surface of the first wall 201 as a circle, the center of the first wall 201 is the center O, that is, the axis of the injection hole 215 passes through the center O. For another example, if the surface of the first wall 201 is a rectangle, the center of the first wall 201 is the intersection of the diagonals of the rectangle.

[0096] The axis of the injection hole 215 coincides with the axis of the electrode assembly 22. If the axis of the injection hole 215 is set to pass through the center of the first wall 201, the axis of the electrode assembly 22 also passes through the center of the first wall 201, that is, the electrode assembly 22 corresponds to the center position of the first wall 201, which is convenient for processing and assembly.

[0097] In the embodiments of the present application, Figures 3 to 5 As shown, the injection hole 215 can be directly disposed on the first wall 201. Alternatively, the injection hole 215 of the embodiment of the present application can also be disposed on other components of the first wall 201. Figure 6 FIG. 2 shows a schematic structural diagram of a battery cell 20 according to another embodiment of the present application. Figure 7The schematic diagram of the exploded structure of a battery cell 20 according to another embodiment of the present application is shown. Figure 7 Can be Figure 6 The schematic diagram of at least a portion of the exploded structure of the battery cell 20 is shown. Figure 8 A schematic top view of a battery cell 20 according to another embodiment of the present application is shown. Figure 8 The battery cell 20 shown may be Figure 6 to Figure 7 A schematic top view of a battery cell 20 is shown.

[0098] In some embodiments, Figures 6 to 8 As shown, the first wall 201 is provided with an electrode terminal 214, and the injection hole 215 passes through the electrode terminal 214. The injection hole 215 is provided to pass through the electrode terminal 214, so that the space of the first wall 201 occupied by the electrode terminal 214 and the injection hole 215 can be reduced, especially when the area of ​​the first wall 201 is limited, the structural integration can be improved, and the structure is simple and easy to implement. Specifically, the central axis of the electrode terminal 214 can also be arranged to coincide with the axis of the injection hole 215, so that the thickness of the side wall of the electrode terminal 214 used to form the injection hole 215 is relatively uniform, which can ensure the structural strength of the electrode terminal 214. Exemplarily, the central axis of the electrode terminal 214 can also pass through the center of the first wall 201, so as to increase the size setting of the electrode terminal 214 and improve the electrical connection efficiency of the electrode terminal 214.

[0099] It should be understood that the electrode terminal 214 of the embodiment of the present application is used to electrically connect to the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figures 6 to 8 As shown, the battery cell 20 may include at least two electrode terminals 214, and the at least two electrode terminals 214 may include at least one positive electrode terminal and at least one negative electrode terminal, the positive electrode terminal is used to be electrically connected to the positive electrode tab of the electrode assembly 22, and the negative electrode terminal is used to be electrically connected to the negative electrode tab of the electrode assembly 22. The positive electrode terminal and the positive electrode tab may be directly connected or indirectly connected, and the negative electrode terminal and the negative electrode tab may be directly connected or indirectly connected. Exemplarily, the positive electrode terminal may be electrically connected to the positive electrode tab through a connecting member 23, and the negative electrode terminal may also be electrically connected to the negative electrode tab through a connecting member 23.

[0100] It should be understood that different electrode terminals 214 may be located on the same wall or different walls of the battery cell 20. For example, the embodiment of the present application takes the battery cell 20 including two electrode terminals 214 as an example. Figures 6 to 8As shown, the two electrode terminals 214 may also be located on different walls, that is, corresponding to the arrangement of the pole lug 222, the multiple electrode terminals 214 of the battery cell 20 may be respectively arranged on two opposite end surfaces, for example, may be respectively arranged on two opposite cover plates 212, so that each pole lug 222 may be electrically connected to a corresponding electrode terminal 214, but the embodiments of the present application are not limited to this.

[0101] For ease of explanation, the following will be described in detail in conjunction with the accompanying drawings, mainly taking the cylindrical battery cell 20 as an example, and taking the first wall 201 as the cover plate 212, and the electrode terminal 214 of the cover plate 212 is provided with a liquid injection hole 215 as an example, but the embodiments of the present application are not limited to this.

[0102] Fig. 9 A cross-sectional schematic diagram of a battery cell 20 according to an embodiment of the present application is shown. Fig. 9 Can be Figure 8 The cross-sectional view of the battery cell 20 along the AA′ direction is shown, wherein the straight line L represents the axis of the electrode assembly 22 and also represents the axis of the injection hole 215. Fig.10 A partial structural diagram of a battery cell 20 according to an embodiment of the present application is shown. Fig.10 You can Figures 6 to 8 A partial structural schematic diagram of a battery cell 20 is shown. Fig.11 The schematic diagram of the partial structure of the battery cell 20 of the embodiment of the present application is shown. Fig.11 Can be Fig.10 The schematic diagram of the partial structure of the battery cell 20 is shown in FIG.

[0103] like Figures 9 to 11 As shown, the electrode terminal 214 of the embodiment of the present application may include at least one pole 2141, and the pole 2141 is used to be electrically connected to the tab 222 of the electrode assembly 22. For example, when the electrode terminal 214 is a positive electrode terminal, the at least one pole 2141 included in the positive electrode terminal is used to be electrically connected to the positive tab; when the electrode terminal 214 is a negative electrode terminal, the at least one pole 2141 included in the negative electrode terminal is used to be electrically connected to the negative tab.

[0104] In some embodiments, the electrode terminal 214 may include only one pole 2141 . For example, the pole 2141 may be located in the central area of ​​the electrode terminal 214 , and the injection hole 215 may pass through the pole 2141 .

[0105] In some embodiments, the electrode terminal 214 may further include a plurality of poles 2141, and the positions of the plurality of poles 2141 may be set according to actual applications. For example, the injection hole 215 may pass through any pole 2141 of the plurality of poles 2141 to save space.

[0106] In some embodiments, the electrode terminal 214 includes a plurality of poles 2141, and the injection hole 215 is located between the plurality of poles 2141, so that the plurality of poles 2141 and the injection hole 215 have little impact, which is convenient for processing. Figures 9 to 11 As shown, the embodiment of the present application mainly takes the example that the electrode terminal 214 includes two poles 2141 , and the injection hole 215 is located between the two poles 2141 .

[0107] In the embodiment of the present application, the electrode terminal 214 includes a rivet block 2142, which is arranged on the outer side of the first wall 201. The first wall 201 is provided with an electrode lead-out hole 2011. The pole 2141 passes through the electrode lead-out hole 2011 and is riveted to the first wall 201 through the rivet block 2142. The injection hole 215 passes through the rivet block 2142. The pole 2141 and the first wall 201 can be fixed by the rivet block 2142, and the structure is simple. In addition, the injection hole 215 is arranged to pass through the electrode terminal 214, and specifically through the rivet block 2142 of the electrode terminal 214, which is easy to implement. In addition, the side of the rivet block 2142 away from the first wall 201 can be used to be electrically connected to the busbar component, and then the electrical connection of multiple battery cells 20 is realized through the busbar component.

[0108] In some embodiments, the pole 2141 can be fixed to the rivet block 2142 by riveting or welding. Figures 9 to 11 As shown, the rivet block 2142 may be provided with at least one first pole hole 2143, and the pole 2141 passes through the corresponding first pole hole 2143 to be riveted and fixed to the rivet block 2142. Among them, the one or more poles 2141 included in the electrode terminal 214 may correspond one to one with the one or more first pole holes 2143 provided in the rivet block 2142, but the embodiment of the present application is not limited thereto.

[0109] In some embodiments, the electrode terminal 214 may include at least one rivet block 2142, and each rivet block 2142 may be used to fix at least one pole 2141. Figures 9 to 11 As shown, each electrode terminal 214 of the battery cell may include a rivet block 2142, which can be used to fix one or more poles 2141, for example, all poles 2141 included in the electrode terminal 214, so as to simplify the structure of the rivet block 2142 and facilitate processing.

[0110] In some embodiments, the axis L of the injection hole 215 passes through the center of the riveted block 2142. Since the axis L of the injection hole 215 coincides with the axis L of the electrode assembly 22, and the axis L of the injection hole 215 passes through the center of the riveted block 2142, the axis L of the electrode assembly 22 also passes through the center of the riveted block 2142, and at least one pole 2141 fixed by the riveted block 2142 can correspond to the middle area of ​​the electrode assembly 22, which facilitates the electrical connection between the pole 2141 and the pole ear 222, and can improve the performance of the battery cell 20.

[0111] In the embodiment of the present application, the battery cell 20 further includes: a first insulating structure 217, the first insulating structure 217 is located between the electrode terminal 214 and the first wall 201, the first insulating structure 217 is arranged on the outside of the first wall 201, and the injection hole 215 passes through the first insulating structure 217. The first insulating structure 217 is arranged between the electrode terminal 214 and the first wall 201, so that the electrode terminal 214 and the first wall 201 are electrically insulated. For example, taking the first wall 201 as the cover plate 212 as an example, the electrode terminal 214 and the cover plate 212 can be electrically insulated by the first insulating structure 217, for example, the first insulating structure 217 can be arranged between the riveting block 2142 and the cover plate 212. In addition, the injection hole 215 passes through the first insulating structure 217, so that the first insulating structure 217 can not hinder the injection.

[0112] In some embodiments, each electrode terminal 214 may correspond to at least one first insulating structure 217. Figures 9 to 11 As shown, each electrode terminal 214 of the battery cell may be provided with a corresponding first insulating structure 217. For example, the first insulating structure 217 may be used to achieve electrical insulation between the first wall 201 and all the poles 2141 of the electrode terminal 214, and may also be used to achieve electrical insulation between the first wall 201 and the rivet block 2142. Specifically, the first insulating structure 217 may include at least one second pole hole 2171, so that the pole 2141 passes through the corresponding second pole hole 2171 and is fixed by the rivet block 2142. Among them, at least a portion of each second pole hole 2171 is located in the electrode lead-out hole 2011 of the first wall 201, so that the pole 2141 and the inner wall of the electrode lead-out hole 2011 can be electrically insulated by the first insulating structure 217.

[0113] In some embodiments, the axis L of the injection hole 215 passes through the center of the first insulating structure 217. Since the axis L of the injection hole 215 coincides with the axis L of the electrode assembly 22, and the axis L of the injection hole 215 passes through the center of the first insulating structure 217, the axis L of the electrode assembly 22 also passes through the center of the first insulating structure 217. Correspondingly, the electrode terminal 214 corresponding to the first insulating structure 217 can correspond to the middle area of ​​the electrode assembly 22, which facilitates the electrical connection between the electrode terminal 214 and the tab 222, and can improve the performance of the battery cell 20.

[0114] In the embodiment of the present application, the battery cell 20 further includes: a second insulating structure 218, the second insulating structure 218 is located between the first wall 201 and the electrode assembly 22, and the injection hole 215 runs through the second insulating structure 218. On the one hand, the second insulating structure 218 can electrically insulate the electrode terminal 214 from the first wall 201, for example, the second insulating structure 218 can electrically insulate the pole 2141 of the electrode terminal 214 from the cover plate 212; on the other hand, the second insulating structure 218 can also be used to support the first wall 201, for example, it can be used to support the cover plate 212 to improve the structural stability of the cover plate 212. In addition, the injection hole 215 runs through the second insulating structure 218, so that the second insulating structure 218 does not hinder the injection.

[0115] In some embodiments, the first wall 201 may be provided with a corresponding second insulating structure 218. Figures 9 to 11 As shown, the cover plate 212 may be provided with a corresponding second insulating structure 218, for example, the second insulating structure 218 may be used to achieve electrical insulation between the cover plate 212 and all the poles 2141 of the electrode terminal 214, and may also be used to support the cover plate 212. Specifically, the second insulating structure 218 may include at least one third pole hole 2181, so that each pole 2141 passes through the corresponding third pole hole 2181.

[0116] In some embodiments, the axis L of the injection hole 215 passes through the center of the second insulating structure 218 to facilitate processing.

[0117] Furthermore, when the axis L of the injection hole 215 coincides with the axis L of the electrode assembly 22, the axis L of the injection hole 215 can be generally arranged to pass through the center of the first wall 201, the center of the electrode terminal 214, the center of the first insulating structure 217, and the center of the second insulating structure 218. Aligning the centers of these structures can facilitate installation; and taking the first wall 201 as the cover plate 212 as an example, the electrode terminal 214 can be located in the central area of ​​the cover plate 212, the size of the electrode terminal 214 can be increased as much as possible, and the connection stability between the electrode terminal 214 and the busbar component is improved, thereby improving the stability and reliability of the battery cell 20.

[0118] In addition, the edge of the first wall 201 can also be used to set other components to improve the structural integration of the battery cell 20. For example, a pressure relief mechanism 213 can be set at the edge of the first wall 201, so that when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 213 is actuated to release the internal pressure or temperature of the battery cell 20. The pressure relief mechanism 213 can be set at any position of the battery cell 20. For example, the embodiment of the present application takes the pressure relief mechanism 213 as being located on the cover plate 212 as an example, but the embodiment of the present application is not limited thereto.

[0119] It should be understood that the battery cell 20 may further include a sealing component 216, which may be used to seal the injection hole. Specifically, the specific implementation of the sealing component 216 may be flexibly set according to actual applications. For example, the sealing component 216 may include: Figures 9 to 11 The sealing structure shown, at least part of which is disposed in the injection hole 215 of the rivet block 2142, for sealing the injection hole 215. For another example, the sealing assembly 216 may also include a sealing nail. The sealing nail may be disposed in the injection hole 215 of the first wall 201, for example, the sealing nail may be located in the injection hole 215 of the cover plate 212, for sealing the injection hole 215 of the cover plate 212. In some embodiments, the side of the sealing assembly 216 away from the injection hole 215 may also be used to be electrically connected to the busbar component, so that the battery cell 20 is electrically connected to the busbar component.

[0120] In some embodiments, the battery cell 20 may further include a sealing ring 219 , which may be used to seal the pole 2141 and the first wall 201 to reduce the electrolyte from overflowing through the electrode lead-out hole 2011 .

[0121] In the embodiment of the present application, the battery cell 20 further includes: a connecting member 23, the connecting member 23 is used to electrically connect to the electrode terminal 214 and the electrode tab 222 of the electrode assembly 22, respectively, and the connecting member 23 is provided with a through hole 2301, wherein in the axis L direction of the injection hole 215, the orthographic projection of the through hole 2301 at least partially overlaps with the orthographic projection of the injection hole 215. In this way, the electrolyte can sequentially enter the battery cell 20 through the injection hole 215 of the first wall 201 and the through hole 2301 provided in the connecting member 23. Moreover, during the injection process, the electrolyte is affected by gravity and usually enters the interior of the battery cell 20 along the axis L of the injection hole 215; therefore, in the direction of the axis L of the injection hole 215, the orthographic projection of the through hole 2301 is set to at least partially overlap with the orthographic projection of the injection hole 215, so that among the electrolyte passing through the injection hole 215, at least part of the electrolyte can directly pass through the through hole 2301 to quickly enter the interior of the battery cell 20, avoiding excessive electrolyte from flowing to other positions of the connecting member 23, which is more conducive to the electrolyte to quickly pass through the injection hole 215 and the through hole 2301, thereby increasing the injection rate.

[0122] It should be understood that when the battery cell 20 is assembled, the connection between the electrode assembly 22 and the electrode terminal 214 on the first wall 201 is generally achieved through the connecting member 23, that is, the connecting member 23 needs to be electrically connected to the electrode assembly 22 and the electrode terminal 214 respectively. Specifically, the connecting member 23 can be used to achieve the connection between the tab 222 of the electrode assembly 22 and the electrode terminal 214. For example, the battery cell 20 may include a positive electrode terminal and a negative electrode terminal, the positive electrode terminal is electrically connected to the positive tab through a connecting member 23, and the negative electrode terminal is electrically connected to the negative tab through a connecting member 23, and the embodiment of the present application is not limited thereto.

[0123] In some embodiments, the axis of the through hole 2301 coincides with the axis L of the injection hole 215. In this way, there is no offset between the injection hole 215 and the through hole 2301 along the axis of the injection hole 215, so that more electrolyte can pass through the injection hole 215 and the through hole 2301 and enter the battery cell 20 more quickly, avoiding excessive electrolyte from splashing to other locations, and further improving the injection rate.

[0124] It should be understood that the specific structure of the connection member 23 of the embodiment of the present application can be flexibly set according to the actual application. For example, the connection member 23 includes a first part 231, a second part 232 and a third part 233 stacked along the axial direction of the injection hole 215, the first part 231 and the second part 232 are connected by a first bending portion 234, the second part 232 and the third part 233 are connected by a second bending portion 235, the first part 231 is electrically connected to the electrode terminal 214, and the third part 233 is electrically connected to the pole ear 222. If the connection member 23 is set to a foldable structure, then the connection member 23 is as follows Fig.11 In the unfolded state shown in FIG. 1 , the surface area is larger, but the connecting member 23 is Fig.12 After being folded in the manner shown, the area occupied can be smaller. In this way, when assembling the battery cell 20, the first part 231 can be electrically connected to the electrode terminal 214 provided on the cover plate 212, and then the third part 233 can be electrically connected to the pole ear 222, and finally the connecting member 23 can be folded to complete the assembly. Since the surface area of ​​the connecting member 23 is large when unfolded, when the third part 233 is electrically connected to the pole ear 222, the first part 231 is far away from the third part 233, and it is not easy to cause an impact on the electrode terminal 214 and the cover plate 212; and the space occupied by the connecting member 23 in the battery cell 20 can be reduced by folding the connecting member 23.

[0125] In some embodiments, Figures 9 to 11 As shown, the first bending portion 234 and the second bending portion 235 are respectively located at two opposite ends of the second portion 232. In this way, for the unfolded connecting member 23, the first portion 231, the first bending portion 234, the second portion 232, the second bending portion 235 and the third portion 233 are sequentially distributed along the length direction of the connecting member 23, which can increase the length of the connecting member 23. When the third portion 233 is electrically connected to the pole tab 222, the first portion 231 and the third portion 233 are spaced far apart. For example, there is at least the second portion 232 between the first portion 231 and the third portion 233, so that the electrode terminal 214 and the cover plate 212 are far apart and are not easily affected; and by folding the connecting member 23, the space occupied by the connecting member 23 in the battery cell 20 can also be greatly reduced.

[0126] In the embodiment of the present application, the first part 231 is provided with a first hole 2311, the second part 232 is provided with a second hole 2321, the third part 233 is provided with a third hole 2331, and the through hole 2301 includes the first hole 2311, the second hole 2321 and the third hole 2331. By forming the through hole 2301 together with the first hole 2311, the second hole 2321 and the third hole 2331, the obstruction of the first part 231, the second part 232 and the third part 233 to the electrolyte can be reduced, so that the electrolyte can smoothly pass through the connecting member 23 into the electrode assembly 22, thereby improving the injection efficiency.

[0127] Further, the aperture of the first hole 2311, the aperture of the second hole 2321, and the aperture of the third hole 2331 of the embodiment of the present application can be flexibly set according to the actual application. For example, the aperture of the first hole 2311, the aperture of the second hole 2321, and the aperture of the third hole 2331 can be set to be unequal, so as to be set according to the requirements of the corresponding first part 231, the second part 232, and the third part 233. For example, the aperture of the first hole 2311 can be reasonably set according to the connection requirements between the first part 231 and the electrode terminal 214; for another example, the aperture of the second hole 2321 can be reasonably set according to the connection requirements between the second part 232 and the pole ear 222. Alternatively, the aperture of the first hole 2311, the aperture of the second hole 2321, and the aperture of the third hole 2331 can also be set to be equal to facilitate processing.

[0128] In some embodiments, at least some of the apertures of the first hole 2311, the second hole 2321, and the third hole 2331 are larger than or equal to the aperture of the injection hole 215. For example, the apertures of the first hole 2311, the second hole 2321, and the third hole 2331 may all be larger than or equal to the aperture of the injection hole 215, so that the electrolyte passing through the injection hole 215 can pass through the first hole 2311, the second hole 2321, and the third hole 2331 more and faster, thereby improving the injection efficiency.

[0129] For another example, among the aperture of the first hole 2311, the aperture of the second hole 2321 and the aperture of the third hole 2331, at least the aperture of the third hole 2331 is smaller than the aperture of the injection hole 215. Then, the electrolyte passing through the injection hole 215 can be converged through the third hole 2331 after passing through the first hole 2311 and the second hole 2321. When the third hole 2331 is aligned with the center of the electrode assembly 22, the electrolyte can be concentratedly injected into the electrode assembly 22, reducing the electrolyte flowing to the flattened area of ​​the electrode assembly 22, reducing electrolyte splashing, and further improving the injection efficiency.

[0130] Furthermore, the aperture of the first hole 2311, the aperture of the second hole 2321 and the aperture of the third hole 2331 can be reduced successively, that is, the aperture of the first hole 2311 is usually the largest, and correspondingly, the aperture of the third hole 2331 is the smallest, so that the electrolyte can converge to the center of the electrode assembly 22, reduce electrolyte splashing, and further improve the injection efficiency.

[0131] When the connecting member 23 is folded, the axis of the first hole 2311, the axis of the second hole 2321 and the axis of the third hole 2331 can be made to coincide with each other, so that the three holes are aligned. When the three holes are aligned, there is no relative obstruction between the three holes, ensuring that the aperture of the through hole 2301 can be equal to the aperture of the third hole 2331 with the smallest aperture among the three holes, thereby improving the injection efficiency.

[0132] In some embodiments, the connecting member 23 of the embodiment of the present application may also have other structures. For example, Fig.12 The schematic diagram of the partial decomposition structure of the battery cell 20 in the embodiment of the present application is shown. Fig.12 Can be Figures 3 to 5 FIG. 2 is a schematic diagram of the partial structure of the battery cell 20 shown in FIG. Fig.12 The battery cell 20 shown is Fig.11 The main difference between the battery cell 20 shown is that due to the different positions of the electrode terminals 214, Fig.12 The injection hole 215 shown does not need to be provided on the electrode terminal 214. Fig.12 The connecting member 23 shown is Fig.11 The connecting members 23 shown are different.

[0133] like Fig.12 As shown, when the electrode terminal 214 is located at the edge, the first portion 231 of the connecting member 23 may also be located at the edge. Therefore, considering the limited size of the battery cell 20, the first portion 231 may still block the electrolyte from flowing into the electrode assembly 22. Fig.11 As shown, the first hole 2311 may still be provided to facilitate the electrolyte to flow into the electrode assembly 22. Alternatively, the first portion 231 may not block the electrolyte from flowing into the electrode assembly 22 at all, and the first hole 2311 may not be provided for the first portion 231, that is, the through hole 2301 may not include the first hole 2311. Alternatively, as Fig.12 As shown, only a partial area of ​​the first portion 231 may block the electrolyte from flowing into the electrode assembly 22, so the first portion 231 may be provided with an avoidance gap 2312, through which the electrolyte is avoided to reduce the obstruction to the electrolyte and improve the injection efficiency.

[0134] It should be understood that the connecting member 23 of the embodiment of the present application may also adopt other structures, which will not be described one by one here. Fig.12 The battery cell 20 shown is Fig.11 The same or similar parts of the battery cell 20 shown are applicable to the above description of Fig.11 For the sake of brevity, the related descriptions of the battery cells 20 are not repeated here one by one.

[0135] The first wall 201 of the battery cell 20 of the embodiment of the present application is provided with an injection hole 215; the electrode assembly 22 is a cylinder, and the axis of the electrode assembly 22 coincides with the axis of the injection hole 215. During the injection process, the electrolyte can be directed to the central part of the electrode assembly 22 through the injection hole 215, and the electrolyte will not be directed to the flattened area, which reduces the obstruction of the electrolyte, can improve the injection efficiency, and further improve the processing efficiency of the battery cell 20, and can also reduce the splashing of the electrolyte and reduce the contamination of the wall where the injection hole 215 is located by the electrolyte.

[0136] According to some embodiments of the present application, the present application further provides a battery 10, comprising the battery cell 20 described in any of the above schemes.

[0137] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 described in any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0138] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0139] According to some embodiments of the present application, see Figures 6 to 11The present application provides a battery cell 20, which includes a first wall 201, and the first wall 201 is provided with a liquid injection hole 215; the battery cell 20 also includes an electrode assembly 22, and the electrode assembly 22 is a cylinder, and the axis of the electrode assembly 22 coincides with the axis of the liquid injection hole 215. The first wall 201 is the cover plate 212. The axis of the liquid injection hole 215 passes through the center of the first wall 201. The first wall 201 is provided with an electrode terminal 214, and the liquid injection hole 215 passes through the electrode terminal 214. The liquid injection hole 215 is located between the multiple poles 2141 of the electrode terminal 214. The axis of the liquid injection hole 215 passes through the center of the rivet block 2142 of the electrode terminal 214. The axis of the liquid injection hole 215 passes through the center of the first insulating structure 217 and the center of the second insulating structure 218. The connecting member 23 is provided with a through hole 2301, and the axis of the through hole 2301 coincides with the axis of the injection hole 215. The first part 231 of the connecting member 23 is provided with a first hole 2311, the second part 232 is provided with a second hole 2321, and the third part 233 is provided with a third hole 2331. The through hole 2301 includes the first hole 2311, the second hole 2321 and the third hole 2331.

[0140] 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. A battery cell, characterized in that: include: A first wall (201), wherein the first wall (201) is provided with a liquid injection hole (215); An electrode assembly (22), wherein the electrode assembly (22) is a cylinder, and the axis of the electrode assembly (22) coincides with the axis of the liquid injection hole (215).

2. The battery cell according to claim 1, characterized in that: The axis of the injection hole (215) passes through the center of the first wall (201).

3. The battery cell according to claim 1 or 2, characterized in that: The first wall (201) is provided with an electrode terminal (214), and the injection hole (215) passes through the electrode terminal (214).

4. The battery cell according to claim 3, characterized in that: The electrode terminal (214) comprises a plurality of poles (2141), wherein the poles (2141) are used to be electrically connected to the pole tabs (222) of the electrode assembly (22), and the injection hole (215) is located between the plurality of poles (2141).

5. The battery cell according to claim 4, characterized in that: The electrode terminal (214) comprises a rivet block (2142), wherein the rivet block (2142) is arranged on the outer side of the first wall (201), the first wall (201) is provided with an electrode lead-out hole (2011), the pole (2141) passes through the electrode lead-out hole (2011) and is riveted to the first wall (201) through the rivet block (2142), and the injection hole (215) passes through the rivet block (2142).

6. The battery cell according to claim 5, characterized in that: The axis of the injection hole (215) passes through the center of the riveting block (2142).

7. The battery cell according to any one of claims 3 to 6, characterized in that: The battery cell comprises: A first insulating structure (217), wherein the first insulating structure (217) is located between the electrode terminal (214) and the first wall (201), the first insulating structure (217) is arranged on the outside of the first wall (201), and the injection hole (215) passes through the first insulating structure (217).

8. The battery cell according to claim 7, characterized in that: The axis of the injection hole (215) passes through the center of the first insulating structure (217).

9. The battery cell according to any one of claims 3 to 8, characterized in that: The battery cell comprises: A second insulating structure (218), wherein the second insulating structure (218) is located between the first wall (201) and the electrode assembly (22), and the injection hole (215) passes through the second insulating structure (218).

10. The battery cell according to claim 9, characterized in that: The axis of the injection hole (215) passes through the center of the second insulating structure (218).

11. The battery cell according to any one of claims 3 to 10, characterized in that: The battery cell comprises: A connecting member (23), the connecting member (23) being used to electrically connect to the electrode terminal (214) and the electrode tab (222) of the electrode assembly (22), the connecting member (23) being provided with a through hole (2301), Wherein, in the axial direction of the liquid injection hole (215), the orthographic projection of the through hole (2301) at least partially overlaps with the orthographic projection of the liquid injection hole (215).

12. The battery cell according to claim 11, characterized in that: The axis of the through hole (2301) coincides with the axis of the injection hole (215).

13. The battery cell according to claim 11 or 12, characterized in that: The connecting member (23) includes a first part (231), a second part (232) and a third part (233) stacked along the axial direction of the injection hole (215), the first part (231) and the second part (232) are connected by a first bending portion (234), the second part (232) and the third part (233) are connected by a second bending portion (235), the first part (231) is electrically connected to the electrode terminal (214), and the third part (233) is electrically connected to the electrode tab (222).

14. The battery cell according to claim 13, characterized in that: The first part (231) is provided with a first hole (2311), the second part (232) is provided with a second hole (2321), the third part (233) is provided with a third hole (2331), and the through hole (2301) includes the first hole (2311), the second hole (2321) and the third hole (2331).

15. The battery cell according to any one of claims 1 to 14, characterized in that: The battery cell comprises: A housing (211), wherein the housing (211) is a hollow structure having an opening (2111); A cover plate (212) is used to cover the opening (2111) of the shell (211), and the first wall (201) is the cover plate (212).

16. The battery cell according to any one of claims 1 to 15, characterized in that: The first wall (201) is circular or rectangular.

17. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 16.

18. An electrical equipment, characterized in that: include: A battery, comprising a plurality of battery cells as claimed in any one of claims 1 to 16, wherein the battery is used to provide electrical energy to the electrical device.

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