Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell and a pole body, the shell defines a containing cavity, the pole body is arranged in the shell, a liquid injection channel used for communicating the containing cavity with the outside of the shell is formed in the pole body, and the liquid injection channel comprises a containing groove and a through hole penetrating through the groove wall of the containing groove. According to the single battery, the liquid injection channel capable of injecting the electrolyte into the accommodating cavity is formed in the pole body, so that the area of the pole body is increased under the condition that the size of the shell is not changed, the current passing efficiency of the single battery is improved, and the liquid injection channel is favorably processed and formed; and the structure and the processing of the shell can be simplified. Besides, as the liquid injection channel comprises the accommodating groove, the liquid injection channel has a relatively large buffer space and plays a role in buffering the electrolyte to a certain extent, and the problems of splashing, overflowing and the like of the electrolyte are favorably reduced when the single battery is used for liquid injection or working.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells. However, the performance and manufacturability of battery cells need to be improved. 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 performance and manufacturability of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell and a pole body, the shell defining a accommodating cavity, the pole body being disposed in the shell, and a liquid injection channel for connecting the accommodating cavity with the outside of the shell being formed on the pole body, the liquid injection channel comprising a accommodating groove and a through hole penetrating the groove wall of the accommodating groove.

[0005] In the above technical solution, by providing an injection channel on the pole body that can inject electrolyte into the accommodating cavity, the electrolyte is injected from the pole body, and there is no need to separately open an injection channel on the shell of the battery cell, so the injection channel will not occupy the space of the shell alone, and the pole body does not need to be reduced in size to avoid the injection channel, so that the area of ​​the pole body and the flow area can be increased without increasing the size of the shell, which is conducive to reducing the flow resistance and improving the current passing efficiency of the battery cell. In addition, increasing the area of ​​the pole body is also conducive to the assembly connection between the pole body and the shell. In addition, since there is no need to increase the size of the shell in order to increase the area of ​​the pole body, it is conducive to miniaturization and lightweight of the shell. In addition, since there is no need to separately open an injection channel on the shell of the battery cell, and the shell is specially processed, it is conducive to reducing the structural complexity and processing difficulty of the shell. Moreover, there is no need to partially thicken the shell in order to weld the sealing nail on the shell, so that the structure and processing of the shell can be further simplified, and there is no need to thicken the shell as a whole in order to weld the sealing nail on the shell, so it is conducive to meeting the requirements of thinness of the shell, and is conducive to improving the energy density of the battery cell, and is conducive to reducing the weight and material cost of the shell. Moreover, by arranging the injection channel on the pole body, it is convenient to manufacture and process the injection channel, so that the size and shape of the injection channel can more easily meet the design requirements and application requirements, which is conducive to reducing the processing difficulty of the injection channel and reducing the processing cost of the injection channel. In addition, since the injection channel includes a receiving groove and a through hole penetrating the groove wall of the receiving groove, the injection channel can connect the receiving cavity with the outside of the shell, thereby meeting the injection requirements, and since the injection channel includes a receiving groove, it has a large buffer space, which can play the role of buffering electrolyte to a certain extent, and is conducive to reducing the possibility of splashing and overflowing of electrolyte when the battery cell is injected or used.

[0006] In some embodiments, the receiving groove includes a first receiving groove with a groove opening open in a direction away from the receiving cavity, and the through hole includes a liquid-passing hole penetrating a groove wall on one side of the first receiving groove close to the receiving cavity.

[0007] In the above technical solution, the first receiving tank can play the role of caching the electrolyte to improve the problems of splashing and overflowing of the electrolyte. Moreover, the side wall of the first receiving tank can block the splashing of the electrolyte to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, the injection nozzle can be flexibly set, for example, the outlet of the injection nozzle can be enlarged, such as setting the outlet of the injection nozzle to match the notch of the first receiving tank, which is conducive to further improving the injection efficiency.

[0008] In some embodiments, the receiving groove also includes a second receiving groove whose groove opening is open in the direction of the receiving cavity. The second receiving groove is located on the side of the first receiving groove close to the receiving cavity. The liquid hole passes through the groove wall on the side of the second receiving groove away from the receiving cavity to connect the first receiving groove and the second receiving groove.

[0009] In the above technical solution, by providing the second containing groove, the gas generated in the containing cavity or the electrolyte with overflow tendency can enter the second containing groove, and the second containing groove can play a buffering role to improve the working reliability of the battery cell. In addition, by providing the second containing groove, the height of the liquid hole during injection can be increased. When the injection height of the electrolyte is flush with the lower end of the liquid hole, it is beneficial to increase the total amount of electrolyte injected and improve the cycle life of the battery cell.

[0010] In some embodiments, the battery cell includes a battery cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion. A connecting hole connecting the first receiving groove and the receiving cavity is formed on the pole body. There are one or more connecting holes and at least one connecting hole serves as a liquid passage hole. The conductive portion is passed through at least one connecting hole to be at least partially received in the first receiving groove.

[0011] In the above technical solution, by accommodating at least part of the conductive part in the first accommodating groove, at least part of the conductive part occupies the space in the first accommodating groove, thereby reducing the space occupied by the conductive part in the accommodating cavity, saving space in the accommodating cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or when the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0012] In some embodiments, the connecting hole through which the conductive part is penetrated is a first connecting hole, and the first connecting hole serves as a liquid passage hole.

[0013] In the above technical solution, when at least the first connecting hole is used as a liquid passage hole, the first connecting hole also has a liquid passage function, that is, it can be used to pass the electrolyte after the first connecting hole is penetrated with the conductive part. At this time, at least the first connecting hole can be used to pass the electrolyte, so that it can be selected as needed whether to set a connecting hole without the conductive part, which is beneficial to reduce the total number of connecting holes, simplify the structure and processing of the pole body, and improve the structural strength of the pole body.

[0014] In some embodiments, the connecting hole through which the conductive part is passed is a first connecting hole, there are multiple connecting holes and the connecting holes also include at least one second connecting hole without a conductive part passed through, and at least the second connecting hole serves as a liquid passage hole.

[0015] In the above technical solution, when at least the second connecting hole is used as the liquid passage hole, at least the second connecting hole can be used to pass the electrolyte. At this time, it is not necessary to set the aperture or number of the first connecting hole larger for the electrolyte to pass through the first connecting hole, nor is it necessary to set the size of the conductive part smaller for the electrolyte to pass through the first connecting hole. It is only necessary to design the size of the first connecting hole to be slightly larger than the size of the conductive part so that the conductive part can pass through. This can improve the problem of impurities falling into the accommodating cavity from the gap between the conductive part and the first connecting hole, and can also improve the problem of weak local strength of the pole body due to the excessive size of the first connecting hole. The size of the conductive part can also be made relatively large, which is conducive to improving the current passing efficiency. Moreover, since the electrolyte will not be affected by the conductive part when passing through the second connecting hole, the injection efficiency can be improved, and the electrolyte is not easy to cause pollution and corrosion to the conductive part.

[0016] In some embodiments, the pole body is formed into a long strip structure, and the connecting hole through which the conductive part is penetrated is formed into a long strip hole extending in a length direction from one end of the pole body to the other end of the length.

[0017] In the above technical solution, the space of the pole body can be fully utilized, and the length of the connecting hole through which the conductive part is passed can be increased as much as possible, so that the connecting hole through which the conductive part is passed can pass through a conductive part of a larger size, which is conducive to increasing the size of the conductive part, thereby improving the current passing efficiency. When the connecting hole through which the conductive part is passed is used as a liquid passing hole, increasing the length of the connecting hole through which the conductive part is passed is also conducive to improving the injection efficiency.

[0018] In some embodiments, the battery cell includes a battery cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion. A connecting hole connecting the first receiving groove and the receiving cavity is formed on the pole body. There are one or more connecting holes and at least one connecting hole serves as a liquid passage hole. The conductive portion is connected to a side wall of the pole body facing the receiving cavity.

[0019] In the above technical solution, by connecting the conductive part to the side wall of the pole body facing the accommodating cavity, the conductive part does not pass through the connecting hole and does not extend into the first accommodating groove, thereby reducing the contamination and corrosion of the connection formed by the conductive part and the pole body caused by the injected electrolyte.

[0020] In some embodiments, the pole body is formed as a long strip structure, and the first receiving groove is formed as a long strip groove extending in a length direction from one end of the pole body to the other end of the length.

[0021] In the above technical scheme, it is beneficial to make full use of the space of the pole body to increase the size of the first receiving groove, improve the injection efficiency, and facilitate the expansion design of the injection nozzle, such as setting the outlet end of the injection nozzle to match the groove of the first receiving groove, which is beneficial to further improve the injection efficiency.

[0022] In some embodiments, the opening of the first receiving groove is in a flared form.

[0023] In the above technical solution, the first receiving groove and the liquid injection nozzle are easily matched, so that the liquid injection nozzle can be easily inserted into the groove of the first receiving groove, and can play a limiting role on the liquid injection nozzle, thereby improving the matching stability between the liquid injection nozzle and the groove of the first receiving groove and reducing the chance of leakage during the liquid injection process.

[0024] In some embodiments, the battery cell further includes: a pole cover plate, which is disposed on the pole body and seals the notch of the first receiving groove.

[0025] In the above technical solution, after liquid injection, a pole cover plate can be used to cover the pole body, so that the pole cover plate can be used to seal the notch of the first receiving groove on the pole body, so that the liquid injection channel is sealed to prevent the electrolyte from overflowing and prevent external foreign matter from entering the battery cell, thereby improving the reliability of the battery cell.

[0026] In some embodiments, at least a portion of the pole cover is embedded in the first receiving groove.

[0027] In the above technical solution, by embedding at least a portion of the pole cover plate in the first accommodating groove, the space occupied by the pole cover plate outside the pole body can be reduced, thereby improving the compactness of the structure.

[0028] In some embodiments, the edge of the pole cover plate has an overlapping portion, and the overlapping portion overlaps a side of the pole body away from the accommodating cavity.

[0029] In the above technical solution, the pole cover plate is easy to match and connect with the pole body. Moreover, when the overlapped portion is welded to the pole body and the pole body has a liquid hole, the overlapped portion can be away from the liquid hole. When electrolyte overflows through the liquid hole, the electrolyte can be away from the welding point between the overlapped portion and the pole body, thereby improving the corrosion and pollution problems caused to the welding point.

[0030] In some embodiments, a side surface of the pole body away from the accommodating cavity has a sinking groove arranged around the first accommodating groove, and at least a part of the overlapping portion is embedded in the sinking groove.

[0031] In the above technical solution, the sink groove can be used to play a positioning role, thereby improving the assembly efficiency of the pole body and the pole cover plate, and the sink groove can be used to play a limiting role to a certain extent, thereby improving the matching stability and reliability of the pole body and the pole cover plate. In addition, by providing the sink groove, the pole cover plate can be further embedded in the pole body, so that the pole cover plate protrudes less or does not protrude from the pole body, thereby helping to reduce the space occupied outside the pole body.

[0032] In some embodiments, a fitting gap is provided between the overlapping portion and the side wall of the sink, and a dimension W of the fitting gap at one end away from the accommodating cavity is less than 0.05 mm.

[0033] In the above technical solution, on the one hand, the overlapping part of the pole cover plate can be smoothly assembled with the countersunk groove of the pole body, and on the other hand, the matching gap between the two is not too large. When welding is used to connect the overlapping part and the pole body, the welding yield of the overlapping part and the pole body can be improved.

[0034] In some embodiments, the battery cell further includes: a first sealing structure, the first sealing structure sealing the liquid hole.

[0035] In the above technical solution, the first sealing structure is provided to seal the liquid hole, thereby sealing the liquid injection channel, preventing electrolyte from overflowing, and preventing external foreign matter from entering the battery cell, thereby improving the reliability of the battery cell.

[0036] In some embodiments, the receiving groove includes a third receiving groove whose groove opening is open toward the receiving cavity, and the through hole includes an injection hole penetrating through a groove wall on one side of the third receiving groove away from the receiving cavity.

[0037] In the above technical solution, the third receiving groove can serve as a buffer for the electrolyte, and the side wall of the third receiving groove can prevent the electrolyte from splashing out, so as to facilitate quick injection. Moreover, the height of the injection hole can be increased. When the injection hole is blocked, the gas or electrolyte generated in the receiving cavity can enter the third receiving groove, and the third receiving groove can serve as a buffer to improve the working reliability of the battery cell. In addition, when the injection height of the electrolyte is level with the lower end of the injection hole, since there is a third receiving groove below the injection hole, the injection height of the electrolyte can be increased, which is conducive to increasing the total injection amount of the electrolyte, thereby improving the cycle life of the battery cell.

[0038] In some embodiments, the flow area of ​​the liquid inlet end of the injection hole is larger than the flow area of ​​the liquid outlet end of the injection hole.

[0039] In the above technical solution, when the electrolyte is injected into the injection hole, it flows from the liquid inlet end to the liquid outlet end. The flow area of ​​the liquid inlet end of the injection hole is set to be larger than the flow area of ​​the liquid outlet end of the injection hole, which is conducive to improving the injection efficiency and improving the problem of electrolyte overflow. In addition, when the injection hole and the injection nozzle are matched, since the flow area of ​​the liquid inlet end of the injection hole is relatively large, it is convenient for the injection nozzle to be inserted into the injection hole, which is conducive to improving the injection efficiency.

[0040] In some embodiments, the battery cell further includes: a second sealing structure, the second sealing structure sealing the injection hole.

[0041] In the above technical solution, by setting the second sealing structure to seal the injection hole, the injection channel can be sealed to prevent the electrolyte from overflowing and prevent foreign matter from entering the battery cell, thereby improving the reliability of the battery cell. In addition, when the flow area of ​​the liquid inlet end of the injection hole is larger than the flow area of ​​the liquid outlet end of the injection hole, the second sealing structure and the injection hole can be quickly assembled.

[0042] In some embodiments, the battery cell includes a battery cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion, at least a portion of the conductive portion is received in a third receiving groove and connected to a side groove wall of the third receiving groove away from the receiving cavity.

[0043] In the above technical solution, since at least part of the conductive part can be accommodated in the third receiving groove, the space occupied by the conductive part in the receiving cavity can be reduced, saving space in the receiving cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or when the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0044] In some embodiments, the shell includes a first shell wall, and the pole body is arranged on the first shell wall, wherein the first shell wall is an integrally formed cover plate, or the first shell wall is integrally formed with at least one second shell wall, and the second shell wall extends toward one side in the thickness direction of the first shell wall.

[0045] In the above technical solution, the position of the pole body can be flexibly designed, thereby increasing the application range of the battery cell.

[0046] In a second aspect, an embodiment of the present application further provides a battery, comprising a busbar component and a battery cell of any of the above-mentioned solutions, wherein there are multiple battery cells and at least two of the battery cells are electrically connected through the busbar component.

[0047] In the above technical solution, since the performance and manufacturability of the battery cell according to the embodiment of the present application are improved, it is beneficial to improve the performance and manufacturability of the battery.

[0048] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery according to any of the above solutions.

[0049] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0052] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0053] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0054] Figure 4 for Figure 3 The schematic diagram of the orthographic projection of the battery cell shown in FIG. 1 with one pole cover opened;

[0055] Figure 5 For along Figure 4 Sectional view along the midline NN;

[0056] Figure 6 for Figure 5 A partial enlarged view of

[0057] Figure 7 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0058] Figure 8 A schematic diagram of the matching of the pole body and the conductive part provided in some embodiments of the present application;

[0059] Fig. 9 For along Figure 8 Sectional view of the mid-PP line;

[0060] Fig.10 A schematic diagram of the matching of the pole body and the conductive part provided in some embodiments of the present application;

[0061] Fig.11 For along Fig.10 Sectional view of the mid-QQ line;

[0062] Fig.12 For along Fig.10 Sectional view of the mid-RR line;

[0063] Fig.13 A schematic diagram of the cooperation between the pole body and the pole cover provided in some embodiments of the present application;

[0064] Fig.14 For along Fig.13 Sectional view along the mid-SS line;

[0065] Fig.15 For along Fig.14 Sectional view of the mid-TT line;

[0066] Fig.16 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0067] Fig.17 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0068] Fig.18 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0069] Fig.19 A partial cross-sectional view of a pole body provided in some embodiments of the present application;

[0070] Fig. 20 for Fig.19 A cross-sectional view of the pole body and the second seal shown in FIG.

[0071] Fig.21 for Fig.19 A cross-sectional view of the pole body shown in the figure, in cooperation with the first seal and the second seal;

[0072] Fig. 22 for Fig.19 A cross-sectional view of the pole body shown in the figure, in cooperation with the first seal and the second seal;

[0073] Fig.23 A partial cross-sectional view of a pole body provided in some embodiments of the present application;

[0074] Fig.24 A partial cross-sectional view of a pole body provided in some embodiments of the present application;

[0075] Fig.25 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0076] Fig.26 A schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0077] Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; case 101; first case body 1011; second case body 1012; battery cell 102; case 1; accommodating chamber 1A; first case wall 11; second case wall 12; pole body 2; liquid injection channel 2B; accommodating groove 21; first accommodating groove 211; second accommodating groove 212; third accommodating groove 213; connecting hole 22; first connecting hole 221; second connecting hole 222; liquid passage hole 23; injection hole 24; liquid inlet end 24a; liquid outlet 24b; first hole section 241; second hole section 242; third hole section 243; sink 25; fitting gap 26; outer stopper 271; inner stopper 272; through hole 28; sealing gasket 1023; insulating gasket 1024; first sealing structure 1025; second sealing structure 1026; pole cover 3; overlapping portion 32; first sealing member 4; second sealing member 5; extension portion 51; central portion 52; edge portion 53; avoidance portion 54; avoidance cavity 55; battery cell assembly 7; active material coating portion 71; conductive portion 72; converging component 103. DETAILED DESCRIPTION

[0078] 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.

[0079] 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.

[0080] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] The term "plurality" used in the present application refers to two or more (including two).

[0085] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0086] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. A battery module generally includes a plurality of battery cells. A battery pack generally includes a box for encapsulating one or more battery cells or one or more battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0087] The battery cell includes a shell, a battery cell assembly and an electrolyte. The shell is used to contain the battery cell assembly and the electrolyte. The battery cell assembly includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly can be a wound structure or a stacked structure. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0088] The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0089] The negative electrode sheet may generally include a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon, etc.

[0090] In order to ensure that a large current can pass without melting, the number of positive pole ears is multiple and stacked together to form the positive pole ear portion, and the number of negative pole ears is multiple and stacked together to form the negative pole ear portion. A pole column is provided on the shell, and the positive pole ear portion is electrically connected to the positive pole column, and the negative pole ear portion is electrically connected to the negative pole column. For example, the pole ear portion can be welded to the pole column to form a direct electrical connection between the pole ear portion and the pole column. For another example, the battery cell assembly may include a transfer plate, the pole ear portion is welded to the transfer plate, and the transfer plate is welded to the pole column to form an indirect electrical connection between the pole ear portion and the pole column.

[0091] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0092] In the related art, the battery cells usually have poles and explosion-proof valves on the top cover of the shell, and also have injection holes on the top cover. The injection holes are spaced apart from the poles, explosion-proof valves and other structural parts. Since the injection holes are separately arranged on the top cover, they occupy the area of ​​the top cover, resulting in a smaller area of ​​the poles. If the area of ​​the poles needs to be increased, the size of the top cover needs to be increased, and the weight of the enlarged top cover also increases, making it difficult to miniaturize and lighten the top cover. Moreover, since the injection holes need to be separately processed on the top cover, the structure of the top cover is relatively complex, the processing is difficult, and the injection holes are not easy to process. Furthermore, for the sake of sealing, it is necessary to weld sealing pins on the top cover to seal the injection hole. However, as the energy density of the battery cell increases, the top cover becomes thinner and thinner, and the top cover is prone to collapse or welding through at the welding sealing pins. To improve this problem, the top cover welding sealing pins are usually partially thickened, which leads to an increase in the material and manufacturing costs of the top cover, or the top cover needs to be thickened as a whole, which will not meet the requirements of the thin and light top cover, affecting the improvement of the energy density of the battery cell.

[0093] To this end, an embodiment of the present application proposes a battery cell, which includes: a shell and a pole body, the shell defines a receiving cavity, the pole body is arranged in the shell, and a liquid injection channel for connecting the receiving cavity with the outside of the shell is formed on the pole body, and the liquid injection channel includes a receiving groove and a through hole penetrating the groove wall of the receiving groove. Therefore, since the liquid injection channel includes the receiving groove and the through hole penetrating the groove wall of the receiving groove, the liquid injection channel can connect the receiving cavity with the outside of the shell, thereby meeting the liquid injection demand. Since the liquid injection channel includes the receiving groove, it has a large cache space, which plays a role in caching electrolyte to a certain extent, which is conducive to reducing the possibility of splashing and overflowing of electrolyte when the battery cell is injected or used for operation.

[0094] Moreover, by providing an injection channel capable of injecting electrolyte into the accommodating cavity on the pole body, the electrolyte is injected from the pole body, and there is no need to separately open an injection channel on the shell of the battery cell, so the injection channel does not occupy the space of the shell alone, and the pole body does not need to be reduced in size to avoid the injection channel, so that the area and flow area of ​​the pole body can be increased without increasing the size of the shell, which is conducive to reducing the flow resistance and improving the current passing efficiency of the battery cell. In addition, the increase in the area of ​​the pole body is also conducive to the assembly connection between the pole body and the shell. In addition, since there is no need to increase the size of the shell in order to increase the area of ​​the pole body, it is conducive to miniaturization and lightweight of the shell. Moreover, it is conducive to the processing and forming of the injection channel, and is conducive to simplifying the structure and processing of the shell. Moreover, there is no need to partially thicken the shell in order to weld the sealing nail on the shell, so that the structure and processing of the shell can be further simplified, and there is no need to thicken the shell as a whole in order to weld the sealing nail on the shell, so it is conducive to meeting the requirements of thinness of the shell, and is conducive to improving the energy density of the battery cell, and is conducive to reducing the weight and material cost of the shell.

[0095] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] Please refer to Figure 2 , Figure 2 An exploded view of the structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 102, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, and the first case body 1011 and the second case body 1012 cover each other, and the first case body 1011 and the second case body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 may be a hollow structure with one end open, the first box body 1011 may be a plate-like structure, and the first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space; the first box body 1011 and the second box body 1012 may also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 may be in various shapes, such as a cylinder, a cuboid, etc.

[0100] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 102 are connected in series and in parallel. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 102 is accommodated in the box 101; of course, the battery 100 can also be a battery module formed by multiple battery cells 102 connected in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 102.

[0101] Each battery cell 102 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 may be cylindrical, flat, or rectangular. Figure 3In the illustrated embodiment, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0102] According to some embodiments of the present application, Figure 4-Figure 6 The battery cell 102 includes: a shell 1 and a pole body 2, the shell 1 defines a accommodating chamber 1A, the pole body 2 is arranged on the shell 1, and an injection channel 2B for connecting the accommodating chamber 1A with the outside of the shell 1 is formed on the pole body 2, and the injection channel 2B includes a accommodating groove 21 and a through hole 28 penetrating the groove wall of the accommodating groove 21.

[0103] For example, the shell 1 includes a first shell wall 11, the side of the first shell wall 11 facing the accommodating chamber 1A is the inner side, and the side of the first shell wall 11 away from the accommodating chamber 1A is the outer side. The pole body 2 is arranged on the first shell wall 11, and an injection channel 2B for connecting the inner side and the outer side is formed on the pole body 2. The injection channel 2B includes a accommodating groove 21 and a through hole 28 penetrating the groove wall of the accommodating groove 21, so that the injection channel 2B can connect the inner side and the outer side to meet the injection requirements.

[0104] For example, if the slot of the receiving groove 21 is open toward the outside (i.e., the slot of the receiving groove 21 is located on the side of the receiving groove 21 away from the receiving cavity 1A), the receiving groove 21 can be connected to the outside, and at this time, the through hole 28 can penetrate the groove wall of the receiving groove 21 on the side close to the inside to communicate with the inside, thereby realizing the connection between the inside and the outside of the injection channel 2B. For another example, if the slot of the receiving groove 21 is open toward the inside (i.e., the slot of the receiving groove 21 is located on the side of the receiving groove 21 close to the receiving cavity 1A), the receiving groove 21 can be connected to the inside, and at this time, the through hole 28 can penetrate the groove wall of the receiving groove 21 on the side close to the outside to communicate with the outside, thereby realizing the connection between the inside and the outside of the injection channel 2B.

[0105] It is understandable that when injecting electrolyte into the battery cell 102, the injection channel 2B can be in a state of connecting the inside and the outside. After the injection is completed, the injection channel 2B can be sealed so that the injection channel 2B no longer connects the inside and the outside, thereby preventing the electrolyte from leaking from the injection channel 2B.

[0106] It is worth noting that the location of the pole body 2 on the shell 1 is not limited. For example, when the battery cell 102 needs to be injected, the battery cell 102 can be placed so that the first shell wall 11 is located at the top of the shell 1. At this time, the pole body 2 and the injection channel 2B on the pole body 2 are both located at the top of the shell 1. When the electrolyte is injected into the accommodating chamber 1A through the injection channel 2B, the electrolyte flows downward through the injection channel 2B and then flows downward into the accommodating chamber 1A, thereby improving the convenience of injection and reducing the probability of electrolyte overflow and splashing. When the battery cell 102 is working, the injection channel 2B can be sealed. At this time, the shell 1 can be placed so that the first shell 1 is located at any position of the shell 1. For example, when the battery cell 102 is working, the first shell wall 11 can be located at the top, bottom, side, etc. of the shell 1.

[0107] It is worth noting that the cross section of the through hole 28 can be circular, but is not limited to circular, and can also be other shapes, such as polygonal, elliptical, oblong, etc. In addition, when the through hole 28 is in a multi-segment form, the cross section of each segment of the through hole 28 can be circular, or at least one segment can have a non-circular cross section.

[0108] According to the battery cell 102 of the embodiment of the present application, by providing an injection channel 2B capable of injecting electrolyte into the accommodating cavity 1A on the pole body 2, the electrolyte is injected from the pole body 2, and there is no need to separately provide an injection channel 2B on the shell 1 of the battery cell 102, so the injection channel 2B does not occupy the space of the shell 1 alone, and the pole body 2 does not need to be reduced in size to avoid the injection channel 2B, so that the area and flow area of ​​the pole body 2 can be increased without increasing the size of the shell 1, which is conducive to reducing the flow resistance and improving the current passing efficiency of the battery cell 102, and the increase in the area of ​​the pole body 2 is also conducive to the assembly connection between the pole body 2 and the shell 1. In addition, since there is no need to increase the size of the shell 1 in order to increase the area of ​​the pole body 2, it is conducive to miniaturization and lightweight of the shell 1.

[0109] Moreover, since there is no need to separately open the injection channel 2B on the shell 1 of the battery cell 102 and perform special processing on the shell 1, it is helpful to reduce the structural complexity and processing difficulty of the shell 1. In addition, there is no need to partially thicken the shell 1 in order to weld the sealing nails on the shell 1, so the structure and processing of the shell 1 can be further simplified, and there is no need to thicken the shell 1 as a whole in order to weld the sealing nails on the shell 1, which is helpful to meet the requirements of thinning the shell 1, improve the energy density of the battery cell 102, and reduce the weight and material cost of the shell 1.

[0110] Moreover, by setting the injection channel 2B on the pole body 2, the manufacturing and processing of the injection channel 2B can be facilitated, so that the size, shape, etc. of the injection channel 2B can more easily meet the design requirements and application needs, which is beneficial to reduce the processing difficulty of the injection channel 2B and reduce the processing cost of the injection channel 2B.

[0111] In addition, since the injection channel 2B includes the receiving groove 21 and the through hole 28 that penetrates the groove wall of the receiving groove 21, the injection channel 2B can connect the receiving cavity 1A with the outside of the shell 1, thereby meeting the injection requirements. Moreover, since the injection channel 2B includes the receiving groove 21, it has a larger cache space, which can play a role in caching electrolyte to a certain extent. When the battery cell 102 is injected or used, it is beneficial to reduce the possibility of splashing and overflowing of the electrolyte.

[0112] In some embodiments of the present application, Figure 6 As shown, the receiving groove 21 includes a first receiving groove 211 with a notch opening facing away from the receiving chamber 1A, and the through hole 28 includes a liquid-passing hole 23 penetrating through the groove wall of the first receiving groove 211 on one side close to the receiving chamber 1A. In this way, when the electrolyte is injected into the battery cell 102, the electrolyte injected from the outside of the first shell wall 11 is first injected into the first receiving groove 211 through the notch of the first receiving groove 211, and the electrolyte entering the first receiving groove 211 flows toward the inside of the first shell wall 11 through the liquid-passing hole 23.

[0113] Thus, the first receiving tank 211 can play the role of caching the electrolyte to improve the problems of splashing and overflowing of the electrolyte. Moreover, the side wall of the first receiving tank 211 (i.e., the tank wall extending from the notch of the first receiving tank 211 toward the receiving chamber 1A) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, the injection nozzle can be flexibly set. For example, the outlet of the injection nozzle can be enlarged, such as setting the outlet of the injection nozzle to match the notch of the first receiving tank 211, which is conducive to further improving the injection efficiency. Alternatively, in some optional embodiments, the injection nozzle can also be directly aligned with the liquid hole 23 for injection, which is not limited here.

[0114] In some embodiments of the present application, Figure 7 As shown, the receiving groove 21 also includes a second receiving groove 212 whose groove opening is open toward the receiving cavity 1A. The second receiving groove 212 is located on the side of the first receiving groove 211 close to the receiving cavity 1A. The liquid hole 23 passes through the groove wall on the side of the second receiving groove 212 away from the receiving cavity 1A to connect the first receiving groove 211 and the second receiving groove 212.

[0115] That is to say, the second containing groove 212 is located on the inner side of the first containing groove 211, or the first containing groove 211 is located on the outer side of the second containing groove 212, or the first containing groove 211 and the second containing groove 212 are arranged in sequence from the outer side to the inner side, and the liquid hole 23 is located between the second containing groove 212 and the first containing groove 211, and respectively penetrates the groove wall of the second containing groove 212 and the groove wall of the first containing groove 211 to connect the first containing groove 211 and the second containing groove 212.

[0116] In this way, when the electrolyte is injected into the battery cell 102, the electrolyte injected from the outside of the first shell wall 11 is first injected into the first receiving groove 211 through the notch of the first receiving groove 211, and the electrolyte entering the first receiving groove 211 enters the second receiving groove 212 through the liquid hole 23, and then flows toward the inside of the first shell wall 11 through the opening of the second receiving groove 212.

[0117] Thus, the gas generated in the containing cavity 1A or the electrolyte with a tendency to overflow can enter the second containing groove 212, and the second containing groove 212 can play a buffering role to improve the working reliability of the battery cell 102. Specifically, during the manufacturing, transportation or use of the battery cell 102, if the electrolyte has a tendency to overflow, the electrolyte that is about to overflow can enter the second containing groove 212, thereby reducing the probability of the electrolyte overflowing from the injection channel 2B, which is conducive to improving the problem of the overflowed electrolyte contaminating the parts on the shell 1, and is conducive to increasing the injection speed during manufacturing, so as to improve the reliability and manufacturability of the battery cell 102. In addition, during the use of the battery cell 102, the electrolyte will produce gas after participating in the reaction, resulting in an increase in the pressure in the shell 1. When the pressure reaches a certain level, there is a reliability problem. When gas is formed in the shell 1, the second containing groove 212 below the liquid hole 23 can play a role in caching gas, improve the reliability problem caused by the increase in pressure, and thus improve the reliability of the battery cell 102.

[0118] Furthermore, by providing the second receiving groove 212, the height of the liquid hole 23 during injection can be increased. When the injection height of the electrolyte is flush with the lower end of the liquid hole 23, it is helpful to increase the total amount of electrolyte injected and improve the cycle life of the battery cell 102. It is understandable that during the use of the battery cell 102, the consumption of the electrolyte will lead to a decrease in the electrolyte inside the battery cell 102, affecting the service life of the battery cell 102. By increasing the total amount of electrolyte injected, it is helpful to improve the service life of the battery cell 102.

[0119] In addition, when the liquid hole 23 is blocked by a longer sealing pin, due to the high height of the liquid hole 23, the sealing pin protrudes from the bottom of the liquid hole 23 for a short length, or does not protrude from the bottom of the liquid hole 23. Therefore, the sealing pin is not easy to interfere with the battery cell assembly 7 below the pole body 2 or to be electrically conductive, so there is no need to thicken the lower plastic structure below the pole body 2, which is beneficial to thinning the lower plastic structure and reducing material costs. It is also beneficial to reducing the space occupied by the lower plastic structure in the accommodating cavity 1A, which is beneficial to improving the energy density of the battery cell 102.

[0120] In some embodiments of the present application, the cross-sectional shape of the first receiving groove 211 and / or the second receiving groove 212 matches the cross-sectional shape of the pole body 2. Thus, the space of the pole body 2 can be fully utilized, so that the size of the first receiving groove 211 and / or the second receiving groove 212 is as large as possible, which is conducive to improving the cache, storage and other functions of the first receiving groove 211 and / or the second receiving groove 212.

[0121] In some embodiments of the present application, Figure 6 As shown, the battery cell 102 includes a cell assembly 7, and the cell assembly 7 includes an active material coating portion 71 accommodated in the accommodating cavity 1A, and a conductive portion 72 connected to the active material coating portion 71. Exemplarily, the conductive portion 72 can be connected to the pole body 2 to form an electrical connection, so as to realize the output of the cell assembly 7 from the electrode at the pole body 2. For example, the conductive portion 72 can be welded to the pole body 2 to achieve the connection. It can be understood that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only a pole ear portion, or may also include a pole ear portion and a transition piece electrically connected to the pole ear portion, etc., which is not limited here.

[0122] Among them, Figure 6As shown, a connecting hole 22 connecting the first receiving groove 211 and the receiving cavity 1A is formed on the pole body 2. There are one or more connecting holes 22 and at least one connecting hole 22 serves as a liquid passage hole 23. The conductive portion 72 is passed through at least one connecting hole 22 to be at least partially received in the first receiving groove 211. Exemplarily, a first receiving groove 211 and a connecting hole 22 are formed on the pole body 2, the first receiving groove 211 is open in a direction away from the receiving chamber 1A to connect with the outside of the shell 1, the connecting hole 22 is located on a side of the first receiving groove 211 close to the receiving chamber 1A, the connecting hole 22 penetrates the groove wall of the first receiving groove 211 on one side close to the receiving chamber 1A to connect the first receiving groove 211 and the receiving chamber 1A, at least one connecting hole 22 is a liquid hole 23, the conductive part 72 can pass through the connecting hole 22 serving as the liquid hole 23 (that is, the connecting hole 22 through which the conductive part 72 passes can still be used for the electrolyte to flow through after passing through the conductive part 72), or can pass through the connecting hole 22 that does not serve as the liquid hole 23 (that is, the connecting hole 22 through which the conductive part 72 passes cannot be used for the electrolyte to flow through after passing through the conductive part 72).

[0123] Therefore, by accommodating at least a portion of the conductive part 72 in the first receiving groove 211, at least a portion of the conductive part 72 occupies the space in the first receiving groove 211, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 1A, saving space in the receiving cavity 1A to accommodate a larger volume of the active material coating part 71, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0124] In some embodiments, Figure 7 As shown, when the pole body 2 has a second accommodating groove 212, the connecting hole 22 connects the first accommodating groove 211 and the second accommodating groove 212, and at least one connecting hole 22 serves as a liquid passage hole 23, and the conductive part 72 can also pass through at least one connecting hole 22 and extend into the first accommodating groove 211. At this time, the conductive part 72 can pass through the connecting hole 22 serving as the liquid passage hole 23 (that is, the connecting hole 22 through which the conductive part 72 passes can still be used for the electrolyte to flow through after passing through the conductive part 72), or can pass through the connecting hole 22 that does not serve as the liquid passage hole 23 (that is, the connecting hole 22 through which the conductive part 72 passes cannot be used for the electrolyte to flow through after passing through the conductive part 72).

[0125] Therefore, by accommodating at least a portion of the conductive part 72 in the first receiving groove 211, at least a portion of the conductive part 72 occupies the space in the first receiving groove 211, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 1A, saving space in the receiving cavity 1A to accommodate a larger volume of the active material coating part 71, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0126] In some embodiments, in combination Figure 8 and Fig. 9 , the connecting hole 22 through which the conductive part 72 is penetrated is the first connecting hole 221 (that is, at least one connecting hole 22 is penetrated by the conductive part 72, and the connecting hole 22 through which the conductive part 72 is penetrated is the first connecting hole 221), and at least the first connecting hole 221 can be used as the liquid passage hole 23. In this way, when the pole body 2 has the first connecting hole 221 through which the conductive part 72 is penetrated, regardless of whether the pole body 2 has the second connecting hole 222 described later without the conductive part 72, the first connecting hole 221 through which the conductive part 72 is penetrated also has the liquid passage function, that is, the first connecting hole 221 still has a liquid passage gap after the conductive part 72 is penetrated. During liquid injection, after the electrolyte is injected into the first containing tank 211, at least part of the electrolyte can flow into the containing chamber 1A from the first connecting hole 221 through which the conductive part 72 is penetrated.

[0127] In some embodiments, in combination Figure 10-12 The connecting hole 22 through which the conductive part 72 is passed is the first connecting hole 221, there are multiple connecting holes 22 and also include at least one second connecting hole 222 through which the conductive part 72 is not passed (that is, at least one connecting hole 22 is not through which the conductive part 72 is passed, and the connecting hole 22 not through which the conductive part 72 is passed is the second connecting hole 222), and at least the second connecting hole 222 can be used as the liquid passage hole 23.

[0128] For example, when the first connecting hole 221 also has a liquid passing function (that is, the first connecting hole 221 still has a liquid passing gap after passing through the conductive part 72), the first connecting hole 221 and the second connecting hole 222 both serve as liquid passing holes 23. When injecting liquid, after the electrolyte is injected into the first containing tank 211, a part of it can flow into the containing cavity 1A from the first connecting hole 221 having the conductive part 72 passed through it, and a part of it can flow into the containing cavity 1A from the second connecting hole 222 not having the conductive part 72 passed through it.

[0129] For another example, when the first connecting hole 221 does not have a liquid-passing function (i.e., the first connecting hole 221 is blocked and cannot pass liquid after passing through the conductive portion 72), only the second connecting hole 222 serves as the liquid-passing hole 23. When injecting liquid, after the electrolyte is injected into the first containing groove 211, it only flows into the containing cavity 1A from the second connecting hole 222 where the conductive portion 72 is not penetrated.

[0130] In an embodiment of the present application, when at least the first connecting hole 221 is used as the liquid passage hole 23, the first connecting hole 221 also has a liquid passage function, that is, after the first connecting hole 221 is penetrated by the conductive portion 72, it can be used to pass the electrolyte. At this time, at least the first connecting hole 221 can be used to pass the electrolyte, so that it can be selected as needed whether to set a connecting hole 22 (such as the second connecting hole 222) that is not penetrated by the conductive portion 72, which is beneficial to reduce the total number of connecting holes 22, so as to simplify the structure and processing of the pole body 2 and improve the structural strength of the pole body 2.

[0131] In the embodiment of the present application, when at least the second connecting hole 222 is used as the liquid passage hole 23, at least the second connecting hole 222 can be used to pass the electrolyte. In this case, it is not necessary to set the aperture or number of the first connecting hole 221 larger for the electrolyte to pass through the first connecting hole 221, nor is it necessary to set the size of the conductive part 72 smaller for the electrolyte to pass through the first connecting hole 221. It is only necessary to design the size of the first connecting hole 221 to be slightly larger than the size of the conductive part 72 so that the conductive part 72 can pass through. This can improve the problem of impurities falling into the accommodating cavity 1A from the gap between the conductive part 72 and the first connecting hole 221, and can also improve the problem of local weak strength of the pole body 2 due to the excessive size of the first connecting hole 221. The size of the conductive part 72 can also be made relatively large, which is conducive to improving the current passing efficiency. Moreover, since the electrolyte will not be affected by the conductive part 72 when passing through the second connecting hole 222, the injection efficiency can be improved, and the electrolyte is not easy to cause pollution and corrosion to the conductive part 72.

[0132] For example, in Example 1 of the present application, there is at least one connecting hole 22, and each connecting hole 22 is penetrated by a conductive portion 72, so each connecting hole 22 is a first connecting hole 221. At this time, at least one first connecting hole 221 constitutes a liquid passage 23. After the electrolyte is injected into the first containing groove 211, it flows into the containing cavity 1A from the first connecting hole 221 penetrated by the conductive portion 72.

[0133] For example, in Example 2 of the present application, there are at least two connecting holes 22, at least one connecting hole 22 is a first connecting hole 221 through which a conductive portion 72 is passed, and at least one connecting hole 22 is a second connecting hole 222 without which a conductive portion 72 is not passed. At this time, the first connecting hole 221 and the second connecting hole 222 both constitute liquid passage holes 23. After the electrolyte is injected into the first containing tank 211, a part of it flows into the containing cavity 1A from the first connecting hole 221 through which a conductive portion 72 is passed, and the rest of it flows into the containing cavity 1A from the second connecting hole 222 without which a conductive portion 72 is not passed.

[0134] For example, in Example 3 of the present application, there are at least two connecting holes 22, at least one connecting hole 22 is a first connecting hole 221 having a conductive portion 72 passing through it, and at least one connecting hole 22 is a second connecting hole 222 having no conductive portion 72 passing through it. After the first connecting hole 221 passes through the conductive portion 72, it is blocked and cannot pass liquid. At this time, only the second connecting hole 222 constitutes the liquid passing hole 23. After the electrolyte is injected into the first containing groove 211, it flows into the containing cavity 1A from the second connecting hole 222 having no conductive portion 72 passing through it.

[0135] In some embodiments, in combination Figure 8 and Fig. 9 The pole body 2 is formed into a long strip structure, and the connecting hole 22 (i.e., the first connecting hole 221) through which the conductive part 72 is passed is formed into a long strip hole whose length is greater than the width and whose length direction extends from one end of the length of the pole body 2 to the other end of the length. In this way, the space of the pole body 2 can be fully utilized, and the length of the first connecting hole 221 can be increased as much as possible, so that the first connecting hole 221 can pass through the conductive part 72 of a larger size, which is conducive to increasing the size of the conductive part 72, thereby improving the current passing efficiency. When the first connecting hole 221 is used as the liquid passage hole 23, increasing the length of the first connecting hole 221 is also conducive to improving the injection efficiency.

[0136] In some embodiments, when the connecting hole 22 through which the conductive part 72 is penetrated is the first connecting hole 221, there are multiple first connecting holes 221 and conductive parts 72, and each first connecting hole 221 is penetrated by at least one conductive part 72. At this time, at least two connecting holes 22 are respectively penetrated by conductive parts 72, thereby improving the problem that the size of a single first connecting hole 221 is large, causing local weak strength of the pole body 2. Moreover, if the first connecting hole 221 is used as a liquid hole 23, increasing the number of the first connecting holes 221 is also beneficial to improving the injection efficiency.

[0137] For example, when the first connecting hole 221 is formed as a long strip hole whose length is greater than the width and whose length direction extends from one end of the length of the pole body 2 to the other end of the length, a plurality of first connecting holes 221 can be arranged at intervals along the width direction of the pole body 2. In this way, the space on the pole body 2 can be more fully utilized, and the problem that the size of a single first connecting hole 221 is large, resulting in the local weakness of the pole body 2, can be improved. Moreover, if the first connecting hole 221 is used as the liquid hole 23, increasing the number of the first connecting holes 221 is also conducive to improving the injection efficiency.

[0138] In some embodiments, in combination Fig.10When the pole body 2 has both the first connecting hole 221 and the second connecting hole 222, if the first connecting hole 221 is formed as a long strip hole whose length is greater than the width and whose length direction extends from one end of the length of the pole body 2 to the other end of the length, the second connecting hole 222 can be set at at least one of the two ends of the length of the first connecting hole 221, so that the space can be fully utilized, and the size of the second connecting hole 222 can be increased as much as possible under the premise of improving the structural strength of the pole body 2, thereby improving the injection efficiency. In addition, when the second connecting hole 222 is provided at both ends of the length of the first connecting hole 221, the injection efficiency can be further improved, the size of each second connecting hole 222 can be reduced, and the problem of local weakness of the pole body 2 can be improved.

[0139] Of course, in the embodiment of the present application, the shape of the first connecting hole 221 and the relative position relationship between the first connecting hole 221 and the second connecting hole 222 are not limited to the above description and can be adjusted according to actual conditions.

[0140] It is worth noting that if Fig.10 As shown, the liquid hole 23 can be staggered (i.e., without overlap) with the connection portion (such as a weld mark) formed by the conductive portion 72 and the pole body 2. In this way, the electrolyte injected into the first receiving groove 211 can be injected into the receiving cavity 1A smoothly through the liquid hole 23 without being blocked by the connection portion, thereby improving the injection efficiency.

[0141] Of course, the present application is not limited thereto. In other embodiments of the present application, for example Fig.17 As shown, the conductive part 72 may not pass through the connecting hole 22 and may not extend into the first receiving groove 211. In this case, the conductive part 72 may be connected to the side wall of the pole body 2 facing the receiving cavity 1A, so that the conductive part 72 is located on the side of the first receiving groove 211 close to the receiving cavity 1A. In this case, each connecting hole 22 may serve as a liquid passage 23. Therefore, when the electrolyte enters the first receiving groove 211, it will not contact the connection portion (such as a weld mark) formed by the connection between the conductive part 72 and the pole body 2, thereby reducing the contamination and corrosion of the connection portion between the conductive part 72 and the pole body 2 caused by the injected electrolyte.

[0142] For example, when the pole body 2 has a second receiving groove 212, Fig.17As shown, the conductive portion 72 may not pass through the connecting hole 22 to be entirely located on the side of the first receiving groove 211 close to the receiving cavity 1A. For example, the conductive portion 72 is connected to the side wall of the pole body 2 facing the receiving cavity 1A, so that the conductive portion 72 is connected to the side wall of the second receiving groove 212 away from the receiving cavity 1A (such as the top wall of the second receiving groove 212). At this time, at least a portion of the conductive portion 72 can be received in the second receiving groove 212, thereby reducing the space occupied by the conductive portion 72 in the receiving cavity 1A, saving space in the receiving cavity 1A to accommodate a larger volume of the active material coating portion 71, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0143] Furthermore, when the pole body 2 has a second receiving groove 212, and the conductive portion 72 is connected to a side wall of the pole body 2 facing the receiving cavity 1A, each communication hole 22 can be used as a liquid passage hole 23. Thus, when the electrolyte enters the first receiving groove 211, it will not contact the connection portion (such as a weld mark) formed by the conductive portion 72 in the second receiving groove 212 and the pole body 2, thereby reducing the contamination and corrosion of the connection portion between the conductive portion 72 and the pole body 2 caused by the injected electrolyte.

[0144] In some embodiments of the present application, Fig.10 As shown, the pole body 2 is formed into a long strip structure, and the first receiving groove 211 is formed into a long strip groove body, that is, the length of the first receiving groove 211 is greater than the width, and the length direction of the first receiving groove 211 extends from one end of the length of the pole body 2 to the other end of the length, so as to make full use of the space of the pole body 2, increase the size of the first receiving groove 211, improve the injection efficiency, and facilitate the expansion design of the injection nozzle, such as setting the outlet end of the injection nozzle to match the groove of the first receiving groove 211, so as to further improve the injection efficiency.

[0145] In some embodiments of the present application, the groove wall on one side of the first containing groove 211 close to the containing cavity 1A can be set to be an inclined surface extending downward in the direction of the liquid hole 23, so as to facilitate the electrolyte in the first containing groove 211 to flow quickly in the direction of the liquid hole 23, improve the injection efficiency, and improve the liquid accumulation problem of the first containing groove 211.

[0146] In some embodiments of the present application, the cross-sectional shape of the pole body 2 can be set to match the cross-sectional shape of the first receiving groove 211, so as to make full use of the space and maximize the size of the first receiving groove 211 to increase the cache capacity of the first receiving groove 211.

[0147] In some embodiments of the present application, when the first receiving groove 211 is formed as a long strip-shaped groove body, the cross-sectional shape of the first receiving groove 211 can be set to be an oblong, a rectangular, an elliptical, etc., so as to achieve flexible setting. Among them, the oblong shape can also be called a runway shape, that is, the two ends of the length of the rectangle are respectively spliced ​​with semicircles.

[0148] In some embodiments of the present application, the notch of the first receiving groove 211 is in an expanded form, that is, the notch of the first receiving groove 211 gradually increases in the direction away from the receiving chamber 1A. This facilitates the cooperation between the first receiving groove 211 and the injection nozzle, so that the injection nozzle can be easily inserted into the notch of the first receiving groove 211, and can limit the injection nozzle, improve the cooperation stability between the injection nozzle and the notch of the first receiving groove 211, and reduce the probability of leakage during the injection process.

[0149] In some embodiments of the present application, Figure 13-Figure 15 The battery cell 102 further includes: a pole cover plate 3, which is covered on the pole body 2 and seals the notch of the first receiving groove 211. In this way, after the liquid is injected, the pole cover plate 3 can be used to cover the pole body 2, so as to use the pole cover plate 3 to seal the notch of the first receiving groove 211 on the pole body 2, so that the injection channel 2B is in a sealed state, preventing the electrolyte from overflowing, and preventing external foreign matter from entering the battery cell 102, thereby improving the reliability of the battery cell 102.

[0150] It is worth noting that the pole cover plate 3 is a non-porous cover plate, thereby ensuring the reliability of sealing. In addition, it should be noted that the material of the pole cover plate 3 is not limited, and can be a single material piece, such as an aluminum cover plate, or a composite material piece, such as a copper-aluminum composite cover plate, etc., which will not be repeated here.

[0151] In addition, it is worth mentioning that when the receiving groove 21 includes a first receiving groove 211 with a notch open toward the outside, the liquid hole 23 can be set on the side of the first receiving groove 211 close to the receiving cavity 1A, and penetrate the groove wall of the first receiving groove 211 close to the receiving cavity 1A. At this time, the first receiving groove 211 is equivalent to a sinking structure, so that the liquid hole 23 is away from the notch of the first receiving groove 211, and the liquid hole 23 is relatively far from the connection between the pole cover plate 3 and the pole body 2. When electrolyte overflows from the liquid hole 23, the overflowed electrolyte is not easy to contact the connection position between the pole body 2 and the pole cover plate 3 (such as welding or bonding, etc.), which can reduce corrosion pollution to the connection position.

[0152] In some embodiments, when the pole body 2 is formed into a long strip structure, the pole cover 3 can be set as a long cover, so as to facilitate the shape matching of the pole body 2 and the pole cover 3 to fully cooperate, facilitate increasing the area of ​​the pole cover 3, and facilitate the assembly connection of the pole cover 3 and the pole body 2. Exemplarily, the shape of the pole cover 3 can be an oblong, a rectangular, or an elliptical shape. Among them, the oblong shape can also be called a runway shape, that is, the length of the rectangle is spliced ​​with semicircles at both ends.

[0153] It can be understood that the pole cover 3 is located at least partially outside the pole body 2 (i.e., the side away from the accommodating cavity 1A), so that the pole cover 3 is covered on the pole body 2. There is no limit to the assembly method of the pole cover 3 and the pole body 2. For example, the pole cover 3 can be completely located outside the pole body 2 (i.e., the side away from the accommodating cavity 1A), or the pole cover 3 can also be partially embedded in the pole body 2.

[0154] In some embodiments of the present application, Figure 13-Figure 15 As shown, at least part of the pole cover 3 is embedded in the first receiving groove 211. Thus, by embedding at least part of the pole cover 3 in the first receiving groove 211, the space occupied by the pole cover 3 outside the pole body 2 can be reduced, thereby improving the compactness of the structure.

[0155] Exemplarily, a cavity is formed between the pole cover plate 3 and the wall of the first receiving groove 211, so that when the battery cell 102 is in use, the cavity can be used to buffer the gas produced in the battery cell 102 or the electrolyte overflowing from the receiving cavity 1A, thereby helping to improve the working reliability of the battery cell 102.

[0156] In some embodiments of the present application, Figure 13-Figure 15 As shown, the edge of the pole cover plate 3 has an overlap portion 32, and the overlap portion 32 overlaps the side of the pole body 2 away from the accommodating cavity 1A. As a result, the pole cover plate 3 is easy to match and connect with the pole body 2. Moreover, when the overlap portion 32 is welded to the pole body 2, and the pole body 2 has a liquid hole 23, the overlap portion 32 can be away from the liquid hole 23. When the electrolyte overflows through the liquid hole 23, the electrolyte can be away from the welding point between the overlap portion 32 and the pole body 2, thereby improving the corrosion and pollution problems caused to the welding point. Moreover, it is easy to realize that there is a cavity between the pole cover plate 3 and the groove wall of the first accommodating groove 211.

[0157] For example, Figure 13-Figure 15As shown, the surface of one side of the pole body 2 away from the accommodating cavity 1A has a sink 25 arranged around the first accommodating groove 211, and at least part of the overlapping portion 32 is embedded in the sink 25, so that the overlapping portion 32 overlaps the side of the pole body 2 away from the accommodating cavity 1A. Thus, the sink 25 can be used to play a positioning role, improving the assembly efficiency of the pole body 2 and the pole cover 3, and the sink 25 can be used to play a limiting role to a certain extent, improving the matching stability and reliability of the pole body 2 and the pole cover 3. In addition, by providing the sink 25, the pole cover 3 can be further embedded in the pole body 2, so that the pole cover 3 is less protruding or not protruding from the pole body 2, which is conducive to reducing the space occupied outside the pole body 2.

[0158] In some embodiments of the present application, Fig.14 As shown, there is a fitting gap 26 between the lap joint 32 and the side wall of the sink 25, and the dimension W of the fitting gap 26 at one end away from the accommodating cavity 1A is less than 0.05 mm, that is, the fitting gap 26 is greater than 0 mm and less than 0.05 mm. As a result, on the one hand, the lap joint 32 of the pole cover plate 3 can be smoothly assembled with the sink 25 of the pole body 2, and on the other hand, the fitting gap 26 between the two is not too large. When welding is used to connect the lap joint 32 and the pole body 2, the welding yield of the lap joint 32 and the pole body 2 can be improved. It is worth noting that the welding method of the lap joint 32 and the pole body 2 is not limited, for example, hot melt welding or brazing can be used, and for example, continuous laser welding of the lap joint 32 and the pole body 2 can be used.

[0159] In some embodiments of the present application, the shape of the pole cover plate 3 matches the cross-sectional shape of the first accommodating groove 211, and the overlapping portion 32 matches the cross-sectional shape of the sink 25, thereby better ensuring that the matching gap 26 between the overlapping portion 32 and the side wall of the sink 25 is uniform.

[0160] In some embodiments of the present application, Figure 6 and Fig.14 As shown, the pole body 2 may include an outer stopper 271 whose stop limit is located outside the housing 1, and an inner stopper 272 whose stop limit is located inside the housing 1, the overlap portion 32 overlaps the outer stopper 271, and the pole body 2 is riveted to the housing 1 to form the outer stopper 271. That is, the pole body 2 is fixed to the housing 1 by riveting, and the outer stopper 271 is formed after the pole body 2 is riveted. In other words, the pole body 2 does not have the outer stopper 271 before riveting, and the outer stopper 271 can be formed after riveting. For example, the pole body 2 can be formed by a stamping process, and then the pole body 2 can be fixed to the housing 1 by riveting.

[0161] Thus, the pre-processing (such as stamping process) before the pole body 2 is riveted can be simplified to conveniently obtain the outer stopper 271. When the structure of the outer stopper 271 is relatively complex, the mold (such as stamping mold) for pre-processing the pole body 2 can be simplified, thereby reducing production costs. Moreover, the pole body 2 riveted to the housing 1 can be an integrally formed part, so that the pole body 2 can be reliably connected to the housing 1, and the connection between the outer stopper 271 and the inner stopper 272 is stable and reliable, which is conducive to improving the connection reliability between the pole body 2 and the pole cover 3.

[0162] Of course, the present application is not limited thereto, for example, in other embodiments, the inner stopper 272 may also be processed by riveting. Alternatively, in other embodiments, other processes other than riveting may be used to obtain the pole body 2, for example, the pole body 2 may be divided into two parts and welded together to be fixed on the housing 1.

[0163] For example, Figure 6 As shown, the battery cell 102 may further include a sealing gasket 1023 (such as a sealing ring) and an insulating gasket 1024 (such as a plastic gasket), which are sandwiched between the pole body 2 and the shell 1. The pole body 2 is riveted to the shell 1, so that the sealing gasket 1023 and the insulating gasket 1024 are fixed between the pole body 2 and the shell 1, which can improve production efficiency and avoid adverse thermal effects of the welding process on the sealing gasket 1023 and the insulating gasket 1024. For example, during riveting, the compression amount of the sealing gasket 1023 (i.e., the difference between the thickness of the sealing gasket 1023 after deformation and the thickness before deformation divided by the thickness before deformation) may be greater than or equal to %, thereby ensuring sealing.

[0164] In some embodiments, the pole body 2 does not have a portion that stops on the outside of the pole cover 3 (i.e., the side away from the accommodating cavity 1A), so that the pole cover 3 is suitable for being installed to the pole body 2 from the outside of the pole body 2 (i.e., the side away from the accommodating cavity 1A). In this way, by setting the pole cover 3 to be installed to the pole body 2 from the outside of the pole body 2 to seal the notch of the first accommodating groove 211, the pole cover 3 can be installed after the liquid is injected, which can ensure the sealing performance, and the installation position is close to the outside, which is convenient for the rapid assembly of the pole cover 3.

[0165] In some embodiments of the present application, since the pole cover plate 3 can seal the notch of the first receiving groove 211, the liquid hole 23 can be no longer sealed separately as needed, thereby simplifying the sealing, improving production efficiency, and reducing production costs. However, the present application is not limited to this. For example, in other embodiments of the present application, the pole cover plate 3 can also be provided while also providing the first sealing structure 1025 to seal the liquid hole 23, thereby improving the sealing reliability of the injection channel 2B. In addition, in some other embodiments of the present application, when the first sealing structure 1025 is provided, the pole cover plate 3 can also be no longer provided.

[0166] For example, in some embodiments, the first sealing structure 1025 can be constructed to be at least partially embedded in the liquid hole 23, and the first sealing structure 1025 is interference-fitted with the liquid hole 23 and seals the liquid hole 23. Thus, the first sealing structure 1025 is fixed by interference fit, which is beneficial to the rapid installation of the first sealing structure 1025, and is beneficial to improving the sealing reliability of the first sealing structure 1025 to the liquid hole 23. Of course, the present application is not limited to this. For example, in other embodiments, the first sealing structure 1025 can also be set to a non-detachable form such as welding, riveting, or a detachable form such as threaded connection, screw connection, etc., which is not limited here. In addition, in order to facilitate the installation of the first sealing structure 1025, the liquid hole 23 can be set to a flared form, etc.

[0167] In the embodiment of the present application, the receiving groove 21 may also not include a first receiving groove 211 that is open in a direction away from the receiving cavity 1A. Fig.18 As shown, the receiving groove 21 includes a third receiving groove 213 whose notch is open toward the receiving cavity 1A, and the through hole 28 includes an injection hole 24 that penetrates the side groove wall of the third receiving groove 213 away from the receiving cavity 1A. That is, the injection hole 24 is located on the outside of the third receiving groove 213 and penetrates the side groove wall of the third receiving groove 213 close to the outside. In this way, when the electrolyte is injected into the battery cell 102, the electrolyte injected from the outside of the pole body 2 enters the third receiving groove 213 through the injection hole 24, and then flows toward the receiving cavity 1A through the notch of the third receiving groove 213. As a result, the third receiving groove 213 can play the role of caching the electrolyte, and the side wall of the third receiving groove 213 can prevent the electrolyte from splashing out, which is convenient for rapid injection.

[0168] Moreover, the height of the injection hole 24 can be increased. When the injection hole 24 is blocked, the gas or electrolyte generated in the accommodating cavity 1A can enter the third accommodating groove 213, and the third accommodating groove 213 can play a buffering role to improve the working reliability of the battery cell 102. In addition, when the injection hole 24 is blocked by a longer sealing nail, due to the higher height of the injection hole 24, the length of the sealing nail protruding from the lower end of the injection hole 24 is shorter, or it does not protrude from the lower end of the injection hole 24. Therefore, the sealing nail is not easy to interfere with the battery cell assembly 7 in the accommodating cavity 1A, or there is no need to thicken the lower plastic structure below the pole body 2 in order to avoid the interference between the sealing nail and the battery cell assembly 7, which is conducive to the thinning of the lower plastic structure, which is conducive to reducing the material cost, and can reduce the space occupied by the lower plastic structure in the accommodating cavity 1A, which is conducive to the improvement of the energy density of the battery cell 102.

[0169] In addition, when the injection height of the electrolyte is level with the lower end of the injection hole 24 , since there is a third receiving groove 213 below the injection hole 24 , the injection height of the electrolyte can be increased, which is beneficial to increase the total injection amount of the electrolyte, thereby improving the cycle life of the battery cell 102 .

[0170] In some embodiments, Fig.18 As shown, the battery cell 102 includes a cell assembly 7, and the cell assembly 7 includes an active material coating portion 71 received in the receiving cavity 1A, and a conductive portion 72 connected to the active material coating portion 71, and at least a portion of the conductive portion 72 is received in the third receiving groove 213, and is connected to a groove wall of the third receiving groove 213 away from the receiving cavity 1A. Therefore, since at least a portion of the conductive portion 72 can be received in the third receiving groove 213, the space occupied by the conductive portion 72 in the receiving cavity 1A can be reduced, and the space in the receiving cavity 1A can be saved to receive a larger volume of the active material coating portion 71, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0171] It is worth noting that if Fig.18 As shown, the injection hole 24 can be staggered (i.e., without overlap) with the connection portion (such as a weld mark) formed by the conductive portion 72 and the pole body 2. In this way, when the electrolyte is injected from the injection hole 24 into the third receiving groove 213, the electrolyte will not be blocked by the connection portion and can smoothly enter the third receiving groove 213 and then enter the receiving cavity 1A, which is beneficial to improving the injection efficiency.

[0172] For example, the pole body 2 is formed into a long strip structure, and the third receiving groove 213 is formed into a long strip groove body, that is, the length of the third receiving groove 213 is greater than the width, and the length direction of the third receiving groove 213 extends from one end of the length of the pole body 2 to the other end of the length, so as to make full use of the space of the pole body 2, increase the size of the third receiving groove 213, and improve the injection efficiency. In some embodiments of the present application, the cross-sectional shape of the pole body 2 can be set to match the cross-sectional shape of the third receiving groove 213, so that the space can be fully utilized, the size of the third receiving groove 213 can be increased as much as possible, and the buffer capacity of the third receiving groove 213 can be increased.

[0173] In the embodiment of the present application, the relative position relationship between the injection hole 24 and the pole body 2 is not limited. For example, the injection hole 24 can be centrally arranged relative to the pole body 2, or the injection hole 24 can be eccentrically arranged relative to the pole body 2. For example, the injection hole 24 is eccentrically arranged in the length direction of the pole body 2, that is, the injection hole 24 is located on one side of the center point of the pole body 2 in the length direction of the pole body 2. As a result, the injection hole 24 can avoid the area where the conductive part 72 is connected to the pole body 2 as much as possible, reduce the contamination and corrosion of the connection part (such as welding mark) formed by the conductive part 72 and the pole body 2 by the injected electrolyte, and make the size of the conductive part 72 relatively large, easy to connect with the pole body 2, and have a higher current passing efficiency.

[0174] In some embodiments of the present application, Fig.19 As shown, the flow area of ​​the liquid inlet end 24a of the injection hole 24 is larger than the flow area of ​​the liquid outlet end 24b of the injection hole 24. When the electrolyte is injected into the injection hole 24, it flows from the liquid inlet end 24a to the liquid outlet end 24b. Setting the flow area of ​​the liquid inlet end 24a of the injection hole 24 to be larger than the flow area of ​​the liquid outlet end 24b of the injection hole 24 is beneficial to improving the injection efficiency and improving the problem of electrolyte overflow. In addition, when the injection hole 24 cooperates with the injection nozzle, since the flow area of ​​the liquid inlet end 24a of the injection hole 24 is relatively large, it is convenient for the injection nozzle to be inserted into the injection hole 24, which is beneficial to improving the injection efficiency.

[0175] In some embodiments of the present application, Fig. 20 As shown, the battery cell 102 further includes a second sealing structure 1026, and the second sealing structure 1026 seals the injection hole 24. Thus, by providing the second sealing structure 1026 to seal the injection hole 24, the injection channel 2B can be sealed to prevent the electrolyte from overflowing and prevent external foreign matter from entering the battery cell 102, thereby improving the reliability of the battery cell 102. In addition, when the flow area of ​​the liquid inlet end 24a of the injection hole 24 is larger than the flow area of ​​the liquid outlet end 24b of the injection hole 24, the second sealing structure 1026 and the injection hole 24 can be quickly assembled.

[0176] For example, in some embodiments, the second sealing structure 1026 can be constructed to be at least partially embedded in the injection hole 24, and the second sealing structure 1026 is interference fit with the injection hole 24 and seals the injection hole 24. Thus, the second sealing structure 1026 is fixed by interference fit, which is beneficial to the rapid installation of the second sealing structure 1026, and is beneficial to improve the sealing reliability of the second sealing structure 1026 to the injection hole 24. Of course, the present application is not limited to this. For example, in other embodiments, the second sealing structure 1026 can also be set to a non-detachable form such as welding, riveting, or a detachable form such as threaded connection, screw-on connection, etc., which is not limited here. In addition, in order to facilitate the installation of the second sealing structure 1026, the injection hole 24 can be set to a flared form, etc.

[0177] In some embodiments of the present application, the structures of the first sealing structure 1025 and the second sealing structure 1026 can be the same or different, for example, both can be set as set sealing structures, and the shapes of the liquid hole 23 and the injection hole 24 can also be the same or different, for example, both can be set as set holes.

[0178] In some embodiments, the setting sealing structure (such as the first sealing structure 1025 and the second sealing structure 1026) can be in a detachable form or in a non-detachable fixed form. Exemplarily, when the setting sealing structure is in a detachable form, it is convenient for the maintenance of the setting hole (such as the liquid hole 23 or the injection hole 24). For example, when the electrolyte needs to be replenished, the setting sealing structure can be removed, the setting hole can be opened, the electrolyte can be replenished and injected, and then the setting sealing structure can be put back. For example, the setting sealing structure can be detachably connected to the pole body 2 by means of threads or screws, so as to facilitate disassembly and assembly. Exemplarily, Fig. 20 As shown, when the setting sealing structure is in a non-detachable fixed form, the setting sealing structure can be fixed to the pole body 2 by welding, riveting, etc., so as to improve the sealing reliability of the setting sealing structure to the setting hole.

[0179] In some embodiments, at least part of the set sealing structure (such as the first sealing structure 1025 and the second sealing structure 1026) is embedded in the set hole (such as the liquid hole 23 or the injection hole 24). That is, the set sealing structure can be fully embedded in the set hole, and only part of the set sealing structure can be embedded in the set hole. Therefore, on the one hand, the space in the set hole can be fully utilized to improve the sealing reliability of the set sealing structure to the set hole, and on the other hand, the height of the set sealing structure protruding outside the set hole can be reduced, and the space occupied by the set sealing structure outside the pole body 2 can be reduced, which is conducive to reducing the overall size of the battery cell 102.

[0180] In some embodiments of the present application, Fig.21 As shown, the setting sealing structure may include a first sealing member 4, at least part of which is embedded in the setting hole and is interference-fitted with the setting hole to seal the setting hole. Thus, the first sealing member 4 is fixed by interference-fitting, which is beneficial to the rapid installation of the first sealing member 4 and to improve the sealing reliability of the first sealing member 4 to the setting hole.

[0181] In some embodiments of the present application, the setting sealing structure may include a second sealing member 5, which is covered at the entrance end of the setting hole and connected to the pole body 2. Specifically, "the second sealing member 5 is covered at the entrance end of the setting hole" should be understood in a broad sense, and the second sealing member 5 may be covered on the outside of the entrance end, or may be embedded inside the entrance end, as long as it is located near the entrance end and covers the entrance end. In this way, sealing can be implemented from the source of the setting hole (i.e., the entrance end), thereby reducing the probability of foreign matter contaminating the setting hole, and the second sealing member 5 is covered at the entrance end of the setting hole, which facilitates the rapid assembly of the second sealing member 5 and improves the assembly efficiency of the second sealing member 5.

[0182] Specifically, the matching mode of the second seal 5 and the pole body 2 is not limited. For example, in some embodiments, the edge of the second seal 5 can overlap the outside of the pole body 2 (that is, the edge of the second seal 5 overlaps the side of the pole body 2 away from the accommodating cavity 1A) and / or at least part of the second seal 5 is embedded in the set hole, and the second seal 5 is welded and sealed with the pole body 2. Therefore, the overlapping and / or embedding mode is conducive to the assembly and positioning of the second seal 5, and the sealing connection between the second seal 5 and the pole body 2 is achieved by welding, which can improve the reliability of the sealing connection between the second seal 5 and the pole body 2.

[0183] In some embodiments, the setting hole includes a first hole segment 241 and a second hole segment 242 arranged in sequence along the injection flow direction, the aperture of the first hole segment 241 is larger than the aperture of the second hole segment 242, that is, the flow area of ​​any cross section of the first hole segment 241 is larger than the flow area of ​​any cross section of the second hole segment 242, and at least a portion of the second sealing member 5 is embedded in the first hole segment 241 and covers the second hole segment 242.

[0184] In the above technical solution, since the part of the second seal 5 embedded in the first hole section 241 can cover the second hole section 242, the set hole can be reliably sealed. In addition, since the aperture of the first hole section 241 is relatively large, at least the second seal 5 is embedded in the first hole section 241, which is convenient for the assembly and positioning of the second seal 5, and is conducive to eliminating the positioning fixture used for connection, etc., and is convenient for the connection between the second seal 5 and the pole body 2. Moreover, the space occupied by the second seal 5 outside the pole body 2 can be reduced, which is conducive to reducing the overall size of the battery cell 102.

[0185] In some embodiments, Fig.21 As shown, the edge of the second seal 5 is sealed and connected with the hole wall of the first hole segment 241. In the above technical solution, by sealing and connecting the edge of the second seal 5 with the hole wall of the first hole segment 241, it is explained that in the radial direction of the first hole segment 241, the second seal 5 can be completely received in the first hole segment 241, which is conducive to further reducing the occupation of the second seal 5 on the space outside the pole body 2, improving the compactness of the second seal 5 and the pole body 2, and using the hole wall of the first hole segment 241 to stop and limit the edge of the second seal 5, the stability and reliability of the connection between the second seal 5 and the pole body 2 can be improved. Exemplarily, the second seal 5 can be further completely sunk into the first hole segment 241 in the axial direction of the first hole segment 241, which is conducive to further reducing the occupation of the second seal 5 on the space outside the pole body 2.

[0186] In some embodiments, Fig. 22 As shown, the second seal 5 includes an extension portion 51, which extends outside the first hole segment 241 and overlaps and is sealed to a side wall of the pole body 2 away from the accommodating cavity 1A. Therefore, the radial dimension of the extension portion 51 in the first hole segment 241 can be increased as needed, so as to increase the sealing-connection area between the second seal 5 and the pole body 2, thereby improving the sealing connection reliability between the second seal 5 and the pole body 2. Moreover, the shape requirements for the first hole segment 241 are relatively low, and it is not necessary to set the edge of the second seal 5 and the hole wall of the first hole segment 241 to match the shape and meet the required clearance fit, thereby reducing the processing accuracy of the pole body 2 and the second seal 5, improving production efficiency, and reducing production costs.

[0187] In some embodiments, Fig.21 and Fig. 22 As shown, the setting hole forms a step surface at the connection between the first hole section 241 and the second hole section 242, and the part of the second sealing member 5 embedded in the first hole section 241 is supported on the step surface. Thus, the connection stability between the second sealing member 5 and the pole body 2 can be improved.

[0188] In some embodiments, the setting sealing structure includes both the first seal 4 and the second seal 5. The first seal 4 is interference-sealed with the second hole segment 242 (i.e., the first seal 4 seals the second hole segment 242 by interference fit with the second hole segment 242), and is located on the side of the second seal 5 close to the accommodating cavity 1A. In the above technical solution, the setting sealing structure includes both the first seal 4 and the second seal 5. The second seal 5 can prevent the first seal 4 from escaping from the setting hole, improve the reliability of the sealing fit between the first seal 4 and the second hole segment 242, and thus improve the sealing reliability of the setting sealing structure as a whole for the setting hole. In addition, the first seal 4 is fixed by interference fit, which is conducive to the rapid installation of the first seal 4.

[0189] In addition, when the first hole segment 241 is set to the above-mentioned form of "the flow area of ​​the first hole segment 241 gradually decreases or remains unchanged along the direction from the first hole segment 241 to the second hole segment 242, and the flow area of ​​the outlet end of the first hole segment 241 is greater than or equal to the flow area of ​​the inlet end of the second hole segment 242", it is beneficial to the assembly connection of the second seal 5.

[0190] In some embodiments, Fig.21 and Fig. 22 As shown, the second seal 5 includes an escape portion 54 protruding in a direction away from the first seal 4, and a side of the escape portion 54 facing the first seal 4 forms an escape cavity 55, and a part of the first seal 4 extends into the escape cavity 55. In the above technical solution, the compactness of the cooperation between the first seal 4 and the second seal 5 can be improved, the occupation and waste of space can be reduced, and the volume of the battery cell 102 can be reduced. Moreover, the second seal 5 is in a concave-convex form, which can improve the structural strength of the second seal 5 and improve the reliability and stability of the cooperation between the second seal 5 and the pole body 2.

[0191] In some embodiments of the present application, Fig.21 and Fig. 22 As shown, the setting sealing structure includes a first sealing member 4 and a second sealing member 5. At least a portion of the first sealing member 4 is embedded in the setting hole and has an interference fit with the setting hole to seal the setting hole. The edge of the second sealing member 5 overlaps the outside of the pole body 2 (combined with the Fig. 22 , that is, the edge of the second sealing member 5 overlaps the side of the pole body 2 away from the accommodating cavity 1A) and / or at least part of the second sealing member 5 is embedded in the setting hole (combined with Fig.21 and Fig. 22), the second sealing member 5 is welded and sealed with the pole body 2, and the second sealing member 5 is located on the side of the first sealing member 4 away from the accommodating cavity 1A. Thus, the first sealing member 4 can effectively seal the setting hole, and the second sealing member 5 can not only seal the setting hole, but also prevent the first sealing member 4 from escaping from the setting hole, thereby improving the sealing reliability of the setting sealing structure for the setting hole.

[0192] Exemplarily, the first sealing member 4 may be made of plastic, rubber or other materials, which is conducive to interference fit and improves the sealing effect.

[0193] Exemplarily, the second seal 5 can be made of the same metal material as the pole body 2, for example, an aluminum part, which is conducive to improving the welding yield of the second seal 5 and the pole body 2. In addition, it is worth noting that the welding method of the second seal 5 and the pole body 2 is not limited, for example, hot melt welding or brazing can be used, and exemplary, pulse laser welding can be used to improve manufacturing efficiency and automation.

[0194] In some embodiments of the present application, the electrolyte is injected from the injection channel 2B of the pole body 2, and the electrolyte enters the housing 1 of the battery cell 102 from the injection channel 2B. No other auxiliary structure is required below the injection channel 2B, which can simplify the structure and reduce costs. After the injection is completed, the first seal 4 is first loaded into the setting hole to achieve pre-sealing, and then the second seal 5 is loaded into the setting hole, and then the second seal 5 is welded to the pole body 2 to achieve a tight seal. Alternatively, after the injection is completed, the pole cover 3 is directly welded to the pole body 2. Alternatively, after the injection is completed, the first seal 4 and the second seal 5 are first loaded into the setting hole, and after the second seal 5 is welded to the pole body 2, the pole cover 3 is welded to the pole body 2. In addition, when the conductive part 72 needs to pass through the first connecting hole 221, the conductive part 72 is firstly penetrated and the conductive part 72 is welded to the pole body 2, and then the electrolyte is injected.

[0195] In some embodiments of the present application, Fig.21 , the setting hole includes a first hole segment 241 and a second hole segment 242, that is, in some embodiments, the setting hole includes at least a first hole segment 241 and a second hole segment 242, the first hole segment 241 is located upstream of the second hole segment 242 along the injection flow direction, the flow area of ​​the first hole segment 241 gradually decreases or remains unchanged along the direction from the first hole segment 241 to the second hole segment 242, the flow area of ​​the second hole segment 242 gradually decreases or remains unchanged along the direction from the first hole segment 241 to the second hole segment 242, and the flow area of ​​the outlet end of the first hole segment 241 is greater than or equal to the flow area of ​​the inlet end of the second hole segment 242.

[0196] Therefore, when the electrolyte is injected into the set hole, it first flows through the first hole segment 241 and then flows through the second hole segment 242. Since the flow area of ​​the first hole segment 241 gradually decreases or remains unchanged along the direction from the first hole segment 241 to the second hole segment 242, the flow area of ​​the second hole segment 242 gradually decreases or remains unchanged along the direction from the first hole segment 241 to the second hole segment 242, and the flow area of ​​the outlet end of the first hole segment 241 is greater than or equal to the flow area of ​​the inlet end of the second hole segment 242, so that the first hole segment 241 can play a role in buffering the electrolyte, which is beneficial to improving the injection efficiency and reducing the risk of splashing and overflowing of the electrolyte.

[0197] In some embodiments of the present application, Fig.23 The setting hole is composed of the first hole segment 241 and the second hole segment 242, that is, the setting hole only includes the first hole segment 241 and the second hole segment 242. The flow area of ​​the first hole segment 241 gradually decreases along the direction from the first hole segment 241 to the second hole segment 242, and the flow area at the outlet end of the first hole segment 241 is equal to the flow area at the inlet end of the second hole segment 242.

[0198] Therefore, the hole is set to be a two-stage type, and the first hole segment 241 is roughly funnel-shaped. The side wall of the first hole segment 241 can have a diversion effect, so that the electrolyte entering the first hole segment 241 can quickly flow in the direction of the second hole segment 242, thereby improving the injection efficiency. Moreover, since the flow area at the outlet end of the first hole segment 241 is equal to the flow area at the inlet end of the second hole segment 242, no step surface is formed between the first hole segment 241 and the second hole segment 242. Combined with the funnel shape of the first hole segment 241, it is not easy for liquid to accumulate in the first hole segment 241.

[0199] In some embodiments of the present application, Fig.24 The setting hole also includes a third hole segment 243, which is located between the first hole segment 241 and the second hole segment 242 along the injection flow direction. The flow area of ​​the third hole segment 243 gradually decreases along the direction from the first hole segment 241 to the second hole segment 242. The flow area at the inlet end of the third hole segment 243 is less than or equal to the flow area at the outlet end of the first hole segment 241, and the flow area at the outlet end of the third hole segment 243 is equal to the flow area at the inlet end of the second hole segment 242.

[0200] Therefore, when the electrolyte is injected into the setting hole, it first flows through the first hole segment 241, then flows through the third hole segment 243, and finally flows through the second hole segment 242. The flow area of ​​the inlet end of the third hole segment 243 is less than or equal to the flow area of ​​the outlet end of the first hole segment 241, which means that the flow area of ​​the first hole segment 241 is relatively large, and the first hole segment 241 can play the role of buffering the electrolyte, which is beneficial to improve the injection efficiency and reduce the risk of electrolyte splashing and overflowing. In addition, since the flow area of ​​the third hole segment 243 is along the direction from the first hole segment 241 to the second hole segment 242, The third hole segment 243 is generally funnel-shaped, and the side wall of the third hole segment 243 can have a flow-guiding effect, so that the electrolyte entering the third hole segment 243 can quickly flow in the direction of the second hole segment 242, thereby improving the injection efficiency. In addition, since the flow area at the outlet end of the third hole segment 243 is equal to the flow area at the inlet end of the second hole segment 242, no step surface is formed between the third hole segment 243 and the second hole segment 242. Combined with the funnel shape of the third hole segment 243, it is not easy to form liquid accumulation in the third hole segment 243.

[0201] In some embodiments, Fig. 20 As shown, the second seal 5 may include a central portion 52 and an edge portion 53 arranged around the central portion 52, the central portion 52 is embedded in the setting hole, and the edge portion 53 overlaps and is sealed to the portion of the side wall of the pole body 2 away from the accommodating cavity 1A surrounding the setting hole. As a result, the shape requirements for the setting hole are relatively low, and there is no need to thicken the pole body 2 in order to process the setting hole into a complex shape, so that the pole body 2 can be thinned, and the positioning and matching of the second seal 5 and the pole body 2 are stable, which is conducive to improving the connection stability and reliability of the second seal 5 and the pole body 2, and the second seal 5 and the pole body 2 are compactly matched, which is conducive to saving space. In addition, the overlapping and connecting mode of the second seal 5 and the pole body 2 is conducive to the quick connection of the two.

[0202] It is worth noting that the sealing structure may include only the first sealing member 4, only the second sealing member 5, or both the first sealing member 4 and the second sealing member 5. In the above embodiments, when it is not stated that the sealing structure includes both the first sealing member 4 and the second sealing member 5, it is possible to select whether to set the first sealing member 4 alone or the second sealing member 5 alone, or both the first sealing member 4 and the second sealing member 5 at the same time, which is not limited here.

[0203] It is worth noting that laser welding has high requirements for the cleanliness of the setting hole. If there is residual electrolyte in the setting hole, the electrolyte is easily vaporized by heat, and the waste gas generated by the vaporization will rush out of the welding pool to cause defects such as pinholes and explosion points in the weld. By setting the injection hole as follows: the setting hole is composed of the first hole segment 241 and the second hole segment 242, that is, the setting hole only includes the first hole segment 241 and the second hole segment 242, the flow area of ​​the first hole segment 241 gradually decreases along the direction from the first hole segment 241 to the second hole segment 242, and the flow area of ​​the outlet end of the first hole segment 241 is equal to the flow area of ​​the inlet end of the second hole segment 242, or the setting hole also includes a third hole segment 243, and the third hole segment 243 is located in the first hole segment 241 along the injection flow direction. 41 and the second hole segment 242, the flow area of ​​the third hole segment 243 gradually decreases along the direction from the first hole segment 241 to the second hole segment 242, and the flow area of ​​the inlet end of the third hole segment 243 is less than or equal to the flow area of ​​the outlet end of the first hole segment 241, and the flow area of ​​the outlet end of the third hole segment 243 is equal to the flow area of ​​the inlet end of the second hole segment 242. Since the liquid accumulation problem of the set hole can be improved, it is beneficial to improve the welding yield of the second sealing member 5 and the pole body 2 and improve the sealing performance.

[0204] In some embodiments of the present application, Figure 6 As shown, the housing 1 includes a first housing wall 11, and the pole body 2 is disposed on the first housing wall 11. Figure 6 As shown, the first shell wall 11 is integrally formed with at least one second shell wall 12, and the second shell wall 12 extends toward one side in the thickness direction of the first shell wall 11. Fig.25 As shown, the first shell wall 11 is an integrally formed cover plate. Thus, the position of the pole body 2 can be flexibly designed, thereby increasing the applicable scope of the battery cell 102 of the embodiment of the present application.

[0205] It is worth noting that the second shell wall 12 can extend from the edge of the first shell wall 11. When the first shell wall 11 is rectangular, at least one of the four edges of the first shell wall 11 can extend the second shell wall 12. For example, only one edge of the first shell wall 11 extends from the second shell wall 12. The first shell wall 11 can also have only two edges that extend from the second shell wall 12 respectively. The first shell wall 11 can also have three edges that extend from the second shell wall 12 respectively. The first shell wall 11 can also have four edges that extend from the second shell wall 12. Exemplarily, when the shell 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 11.

[0206] For example, the shell 1 may include a shell body and a cover plate, the shell body defines a space with one side open, and the cover plate is arranged on the open side of the shell body to form a accommodating chamber 1A between the shell body and the cover plate. At this time, the wall surface of the shell body on the side opposite to the cover plate is the first shell wall 11, and the wall surface of the shell body connected between the first shell wall 11 and the cover plate is the second shell wall 12, or, the wall surface of the shell body on the side opposite to the cover plate is the second shell wall 12, and the wall surface of the shell body connected between the second shell wall 12 and the cover plate is the first shell wall 11, or, the cover plate is the first shell wall 11, either way.

[0207] According to some embodiments of the present application, Figure 2 and Fig.26 The present application also provides a battery 100, comprising a busbar component 103 and a battery cell 102 of any of the above schemes, wherein the battery cells 102 are multiple and at least two are electrically connected through the busbar component 103. Thus, the series connection and / or parallel connection of multiple battery cells 102 can be achieved. Since the performance and manufacturability of the battery cell 102 according to the embodiment of the present application are improved, it is beneficial to improve the performance and manufacturability of the battery 100. It is worth noting that the battery 100 according to the embodiment of the present application may include a housing 101 or may not include the housing 101.

[0208] For example, when multiple battery cells 102 are connected in series, the anode pole cover 3 of one battery cell 102 is connected to the cathode pole cover 3 of the next battery cell 102 via a busbar component 103, and the cathode pole cover 3 of the battery cell 102 is connected to the anode pole cover 3 of the previous battery cell 102 via another busbar component 103.

[0209] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery 100 according to any of the above solutions.

[0210] According to some embodiments of the present application, the present application further provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide electric energy to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0211] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0212] Reference Figure 3-Figure 6The battery cell 102 includes a shell 1, a pole body 2, a pole cover 3 and a cell assembly 7. The shell 1 defines a accommodating chamber 1A. The pole body 2 is arranged on the shell 1. A liquid injection channel 2B for connecting the accommodating chamber 1A with the outside of the shell 1 is formed on the pole body 2. The liquid injection channel 2B includes a first accommodating groove 211 and a liquid hole 23. The notch of the first accommodating groove 211 is open in a direction away from the accommodating chamber 1A. A connecting hole 22 connecting the first accommodating groove 211 and the accommodating chamber 1A is formed on the pole body 2. The connecting hole 22 is one or more and at least one connecting hole 22 serves as the liquid hole 23. The pole cover 3 is a non-porous cover and is covered on the pole body 2 and is used to seal the notch of the first accommodating groove 211.

[0213] The battery cell assembly 7 includes an active material coating portion 71 and a conductive portion 72. The active material coating portion 71 is received in the accommodating cavity 1A. The conductive portion 72 connects the active material coating portion 71 and the pole body 2. The conductive portion 72 is passed through at least one connecting hole 22 to be at least partially received in the first accommodating groove 211. The portion of the conductive portion 72 located in the first accommodating groove 211 is welded to the pole body 2.

[0214] When manufacturing the battery cell 102, the conductive part 72 is first passed through the connecting hole 22 on the pole body 2 to achieve welding between the conductive part 72 and the pole body 2, and then the electrolyte is injected into the first receiving groove 211. The electrolyte injected into the first receiving groove 211 enters the shell 1 through the liquid hole 23. After the injection is completed, the pole cover plate 3 is sealed and welded to the pole body 2 to achieve a tight seal.

[0215] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0216] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing defines a receiving cavity; and The pole body is arranged on the shell, and a liquid injection channel for connecting the accommodating cavity with the outside of the shell is formed on the pole body. The liquid injection channel includes an accommodating groove and a through hole penetrating the groove wall of the accommodating groove.

2. The battery cell according to claim 1, characterized in that: The receiving groove comprises a first receiving groove with a groove opening opened in a direction away from the receiving cavity, and the through hole comprises a liquid-passing hole penetrating a groove wall on one side of the first receiving groove close to the receiving cavity.

3. The battery cell according to claim 2, characterized in that: The receiving groove also includes a second receiving groove with a groove opening open toward the receiving cavity, the second receiving groove is located on a side of the first receiving groove close to the receiving cavity, and the liquid hole passes through a groove wall on a side of the second receiving groove away from the receiving cavity to connect the first receiving groove and the second receiving groove.

4. The battery cell according to claim 2 or 3, characterized in that: The battery cell includes a cell assembly, which includes an active material coating portion received in the accommodating cavity, and a conductive portion connected to the active material coating portion. A connecting hole connecting the first accommodating groove and the accommodating cavity is formed on the pole body. There are one or more connecting holes and at least one of the connecting holes serves as the liquid passage hole. The conductive portion is passed through at least one of the connecting holes to be at least partially received in the first accommodating groove.

5. The battery cell according to claim 4, characterized in that: The communicating hole through which the conductive part is penetrated is a first communicating hole, and the first communicating hole serves as the liquid passage hole.

6. The battery cell according to claim 4, characterized in that: The connecting hole through which the conductive part is penetrated is a first connecting hole, and the connecting holes are multiple and also include at least one second connecting hole through which the conductive part is not penetrated, and at least the second connecting hole serves as the liquid passage hole.

7. The battery cell according to any one of claims 4 to 6, characterized in that: The pole body is formed into a long strip structure, and the connecting hole through which the conductive part is penetrated is formed into a long strip hole extending in a length direction from one end of the pole body to the other end of the length.

8. The battery cell according to claim 2 or 3, characterized in that: The battery cell includes a cell assembly, which includes an active material coating portion received in the accommodating cavity, and a conductive portion connected to the active material coating portion. A connecting hole connecting the first accommodating groove and the accommodating cavity is formed on the pole body. There are one or more connecting holes and at least one of the connecting holes serves as the liquid passage hole. The conductive portion is connected to a side wall of the pole body facing the accommodating cavity.

9. The battery cell according to any one of claims 2 to 8, characterized in that: The pole body is formed into a long strip structure, and the first accommodating groove is formed into a long strip groove extending from one end of the pole body to the other end in the length direction.

10. The battery cell according to any one of claims 2 to 9, characterized in that: The notch of the first accommodating groove is in a flared form.

11. The battery cell according to any one of claims 2 to 10, characterized in that: Also includes: A pole cover plate is disposed on the pole body and seals the notch of the first receiving groove.

12. The battery cell according to claim 11, characterized in that: At least a portion of the pole cover is embedded in the first accommodating groove.

13. The battery cell according to claim 11 or 12, characterized in that: The edge of the pole cover plate has an overlapping portion, and the overlapping portion is overlapped on a side of the pole body away from the accommodating cavity.

14. The battery cell according to claim 13, characterized in that: A side surface of the pole body away from the accommodating cavity has a sinking groove arranged around the first accommodating groove, and at least a part of the overlapping portion is embedded in the sinking groove.

15. The battery cell according to claim 14, characterized in that: A fitting gap is provided between the overlapping portion and the side wall of the sink, and a dimension of the fitting gap at an end away from the accommodating cavity is less than 0.05 mm.

16. The battery cell according to any one of claims 2 to 15, characterized in that: Also includes: A first sealing structure is provided, wherein the first sealing structure seals the liquid passage hole.

17. The battery cell according to claim 1, characterized in that: The receiving groove comprises a third receiving groove with a groove opening opened toward the receiving cavity, and the through hole comprises an injection hole penetrating a groove wall of the third receiving groove away from the receiving cavity.

18. The battery cell according to claim 17, characterized in that: The flow area of ​​the liquid inlet end of the injection hole is larger than the flow area of ​​the liquid outlet end of the injection hole.

19. The battery cell according to claim 17 or 18, characterized in that: Also includes: A second sealing structure is provided, wherein the second sealing structure seals the injection hole.

20. The battery cell according to any one of claims 17 to 19, characterized in that: The battery cell includes a cell assembly, which includes an active material coating portion received in the accommodating cavity, and a conductive portion connected to the active material coating portion, at least part of the conductive portion is received in a third accommodating groove, and is connected to a groove wall on one side of the third accommodating groove away from the accommodating cavity.

21. The battery cell according to any one of claims 1 to 20, characterized in that: The shell includes a first shell wall, and the pole body is arranged on the first shell wall, wherein the first shell wall is an integrally formed cover plate, or the first shell wall is integrally formed with at least one second shell wall, and the second shell wall extends toward one side in the thickness direction of the first shell wall.

22. A battery, characterized in that: The invention comprises a busbar component and a battery cell according to any one of claims 1 to 21, wherein the battery cells are plural and at least two of the battery cells are electrically connected via the busbar component.

23. An electrical device, characterized in that: Comprising a battery according to claim 22.

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