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. Wherein the battery monomer comprises a shell, a pole column body and a pole column cover plate, the shell defines a containing cavity, the pole column body is arranged on the shell, a communication channel communicated with the containing cavity is formed in the pole column body, the pole column cover plate is arranged on the pole column body, and a liquid injection hole communicated with the communication channel is formed in the pole column cover plate. According to the battery monomer, the area of the pole structure is increased under the condition that the size of the shell is not changed, so that the current passing efficiency of the battery monomer is improved, the processing and forming of the liquid injection hole are facilitated, the structure and processing of the shell are simplified, in addition, in the production and use processes, the possibility of splashing and overflowing of electrolyte is reduced, and the service life of the battery monomer is prolonged. Therefore, the reliability and the manufacturability of the battery monomer are improved.

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, which includes: a shell, a pole body and a pole cover plate, the shell defines a accommodating cavity, the pole body is disposed in the shell, a connecting channel connected to the accommodating cavity is formed on the pole body, the pole cover plate is covered on the pole body, and a liquid injection hole connected to the connecting channel is formed on the pole cover plate.

[0005] In the above technical solution, by setting the injection hole on the pole cover plate and cooperating with the pole body with a connecting channel, the electrolyte is injected into the pole structure composed of the pole body and the pole cover plate, and there is no need to set a separate injection hole on the shell of the battery cell, so the injection hole will not occupy the space of the shell alone, and the pole structure does not need to be reduced in size to avoid the injection hole, so that the area and flow area of ​​the pole structure 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 structure is also conducive to the assembly connection between the pole structure 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 structure, it is conducive to miniaturization and lightweight of the shell. In addition, there is no need to perform special processing on the shell in order to set a separate injection hole on the shell, which 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 nails on the shell, so that the structure and processing of the shell can be further simplified. There is no need to thicken the shell as a whole in order to weld the sealing nails on the shell, which is conducive to meeting the requirements of thinness and lightness 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 setting the injection hole on the pole cover plate, the manufacturing and processing of the injection hole can be facilitated, so that the size and shape of the injection hole can more easily meet the design requirements and application requirements, which is conducive to reducing the processing difficulty of the injection hole and reducing the processing cost of the injection hole. In addition, by setting the injection hole on the pole cover plate and setting the connecting channel on the pole body, the injection path can be extended to a certain extent, and the injection buffering effect can be played to a certain extent, which is conducive to reducing the possibility of splashing and overflowing of the electrolyte when the battery cell is injected or working.

[0006] In some embodiments, the connecting channel includes a first receiving groove and a liquid hole, the first receiving groove is open toward the pole cover plate to connect with the injection hole, and the liquid hole passes through the groove wall of the first receiving groove and connects the first receiving groove and the receiving cavity.

[0007] In the above technical solution, since the communication channel includes the first receiving groove formed on the pole body, the first receiving groove can play the role of caching the electrolyte, and the battery cell can improve the problems of electrolyte splashing and overflowing when injecting or working. Moreover, when injecting the electrolyte, since the first receiving groove can cache the electrolyte, it is beneficial to improve the injection efficiency of the electrolyte, and the side wall of the first receiving groove can prevent the electrolyte from splashing to a certain extent, reducing the pollution caused by the electrolyte to the outside.

[0008] 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.

[0009] 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.

[0010] In some embodiments, the connecting hole through which the conductive portion is passed is a first connecting hole, and at least the first connecting hole serves as a liquid passage hole.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] In some embodiments, the notch of the first accommodating groove is located on a side of the first accommodating groove away from the accommodating cavity, the groove wall on the side of the first accommodating groove close to the accommodating cavity is a groove bottom wall, the conductive part is connected to the groove bottom wall to form a first connecting part, and the positive projection of the injection hole on the groove bottom wall is staggered with the first connecting part.

[0015] In the above technical solution, the electrolyte injected from the injection hole can avoid the first connection part between the conductive part and the pole body as much as possible, thereby reducing the contamination and corrosion of the first connection part caused by the electrolyte.

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

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

[0018] In some embodiments, the pole cover is an elongated cover, and the injection hole is eccentrically arranged in the length direction of the pole cover.

[0019] In the above technical solution, the injection hole can avoid the conductive part as much as possible, thereby reducing the pollution and corrosion of the conductive part and the first connecting part of the pole body caused by the injected electrolyte.

[0020] In some embodiments, the connecting hole through which the conductive part is passed is a first connecting hole, there are multiple first connecting holes and multiple conductive parts, and each first connecting hole is passed through by at least one conductive part.

[0021] In the above technical solution, the problem that the size of a single first connecting hole is large, causing the local strength of the pole body to be weak, can be improved. Moreover, if the first connecting hole is used as a liquid passage hole, increasing the number of the first connecting holes can also help improve the injection efficiency.

[0022] In some embodiments, the battery cell includes a 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, wherein the conductive portion is connected to a side wall of the pole body facing the receiving cavity.

[0023] 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 conductive part and the first connecting part of the pole body caused by the injected electrolyte.

[0024] In some embodiments, the connecting channel also includes a second receiving groove, which is located on a side of the first receiving groove close to the receiving cavity, and the second receiving groove is open toward the receiving cavity to connect with the receiving cavity, and the liquid hole passes through the groove wall of the second receiving groove to connect the first receiving groove and the second receiving groove.

[0025] In the above technical solution, the second containing tank can serve the function of buffering electrolyte or gas. When the battery cell is injected with liquid, the second containing tank can be used to buffer the electrolyte to improve the problems of splashing and overflowing of the electrolyte. When the battery cell is working, the electrolyte will produce gas after participating in the reaction. The second containing tank can be used to buffer the electrolyte or the gas produced in the containing cavity, thereby improving the problems of electrolyte overflow or excessive gas pressure in the containing cavity, thereby improving the reliability of the battery cell.

[0026] In some embodiments, the liquid injection hole and the liquid passage hole are arranged opposite to each other.

[0027] In the above technical solution, the electrolyte injected through the injection hole can flow directly toward the liquid passage hole arranged opposite to the injection hole, so that the injection can be achieved more quickly and efficiently, thereby improving the injection efficiency.

[0028] In some embodiments, at least a portion of the pole cover is embedded in the first receiving groove.

[0029] 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.

[0030] 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.

[0031] In the above technical solution, the pole cover plate is easy to match and connect with the pole body, and the height of the cavity between the pole cover plate and the wall of the first receiving groove is easy to control, so that the volume of the cavity meets the design requirements. In addition, 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 the 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.

[0032] In some embodiments, the edge of the pole cover plate has an overlap portion, and a side surface of the pole body away from the accommodating cavity has a sink groove arranged around the first accommodating groove, and at least a part of the overlap portion is embedded in the sink groove.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In some embodiments, the injection hole is arranged on the pole cover of the cathode, and the pole cover of the cathode is made of the same material as the pole body of the cathode.

[0037] In the above technical solution, when the injection hole is set on the cathode pole cover, the electrolyte flows to the welding point between the cathode pole cover and the cathode pole body. Since the welding point is usually a combination of the same material, it is not easy to cause corrosion to the welding point, which is beneficial to improve the connection reliability between the pole cover and the pole body.

[0038] In some embodiments, the pole cover includes a first cover portion and a second cover portion, the first cover portion is made of the same material as the pole body, the first cover portion is connected to the pole body, the second cover portion is connected to the first cover portion, and the injection hole is arranged on the first cover portion or the second cover portion.

[0039] In the above technical solution, when the injection hole is set on the pole cover plate of composite material, when the material of the first cover plate part and the pole body is the same, the electrolyte flows to the welding point between the first cover plate part and the pole body. Since the welding point is a combination of the same material, it is not easy to cause corrosion to the welding point, which is beneficial to improve the connection reliability between the pole cover plate and the pole body.

[0040] In some embodiments, the flow area of ​​the liquid inlet end of the liquid injection hole is larger than the flow area of ​​the liquid outlet end of the liquid injection hole.

[0041] 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 convenient for the cooperation between the injection hole and the injection nozzle, for example, it is convenient for the injection nozzle to be inserted into the liquid inlet end of the injection hole, thereby helping to reduce the probability of leakage during the electrolyte injection process. Moreover, since the flow area of ​​the liquid inlet end of the injection hole is relatively large, it is convenient to install the sealing structure to achieve the sealing of the injection hole.

[0042] In some embodiments, the injection hole includes a first hole segment and a second hole segment. The first hole segment is located upstream of the second hole segment along the injection flow direction. The flow area of ​​the first hole segment gradually decreases or remains unchanged along the direction from the first hole segment to the second hole segment. The flow area of ​​the second hole segment gradually decreases or remains unchanged along the direction from the first hole segment to the second hole segment, and the flow area of ​​the outlet end of the first hole segment is greater than or equal to the flow area of ​​the inlet end of the second hole segment.

[0043] In the above technical solution, the flow area of ​​the first hole segment is relatively large, so that the first hole segment is easy to cooperate with the injection nozzle, and the first hole segment 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. It is also convenient to assemble a sealing structure to the injection hole to achieve reliable sealing of the injection hole after injection.

[0044] In some embodiments, the injection hole consists of a first hole segment and a second hole segment, the flow area of ​​the first hole segment gradually decreases along the direction from the first hole segment to the second hole segment, and the flow area at the outlet end of the first hole segment is equal to the flow area at the inlet end of the second hole segment.

[0045] In the above technical solution, the injection hole is a two-stage type, and the first hole segment is roughly funnel-shaped. The side wall of the first hole segment can have a flow-guiding effect, so that the electrolyte entering the first hole segment can quickly flow in the direction of the second hole segment, thereby improving the injection efficiency. Moreover, since the flow area at the outlet end of the first hole segment is equal to the flow area at the inlet end of the second hole segment, no step surface is formed between the first hole segment and the second hole segment. Combined with the funnel shape of the first hole segment, it is not easy for liquid to accumulate in the first hole segment.

[0046] In some embodiments, the injection hole also includes a third hole segment, and the third hole segment is located between the first hole segment and the second hole segment along the injection flow direction. The flow area of ​​the third hole segment gradually decreases along the direction from the first hole segment to the second hole segment, and the flow area of ​​the inlet end of the third hole segment is less than or equal to the flow area of ​​the outlet end of the first hole segment, and the flow area of ​​the outlet end of the third hole segment is equal to the flow area of ​​the inlet end of the second hole segment.

[0047] In the above technical solution, when the electrolyte is injected into the injection hole, it first flows through the first hole segment, then flows through the third hole segment, and finally flows through the second hole segment. The flow area at the inlet end of the third hole segment is less than or equal to the flow area at the outlet end of the first hole segment, which means that the flow area of ​​the first hole segment is relatively large, making it easy for the first hole segment to cooperate with the injection nozzle. Moreover, the first hole segment can serve as a buffer for the electrolyte, which is beneficial to improving the injection efficiency and reducing the risk of splashing and overflowing of the electrolyte. In addition, it is easy to assemble a sealing structure to the injection hole to achieve reliable sealing of the injection hole after injection. Moreover, since the flow area of ​​the third hole segment gradually decreases along the direction from the first hole segment to the second hole segment, the third hole segment is generally funnel-shaped, and the side wall of the third hole segment can have a diversion effect, so that the electrolyte entering the third hole segment can flow quickly in the direction of the second hole segment, thereby improving the injection efficiency. In addition, since the flow area at the outlet end of the third hole segment is equal to the flow area at the inlet end of the second hole segment, no step surface is formed between the third hole segment and the second hole segment. Combined with the funnel shape of the third hole segment, it is not easy for liquid to accumulate in the third hole segment.

[0048] In some embodiments, the battery cell further includes: a sealing structure, which cooperates with the pole cover plate and seals the liquid injection hole.

[0049] In the above technical solution, a sealing structure is provided to ensure the sealing of the injection hole, prevent the electrolyte from overflowing, and prevent external foreign matter from entering the accommodating cavity through the injection hole, thereby improving the reliability of the battery cell.

[0050] In some embodiments, the sealing structure includes: a first sealing member, at least a portion of which is embedded in the liquid injection hole, and the first sealing member is interference fit with the liquid injection hole and seals the liquid injection hole.

[0051] In the above technical solution, the first sealing member is fixed by means of interference fit, which is beneficial to the rapid installation of the first sealing member and to improving the sealing reliability of the first sealing member to the injection hole.

[0052] In some embodiments, the sealing structure includes: a second sealing member, which is covered at the liquid inlet end of the liquid injection hole and is sealed and connected to the pole cover plate.

[0053] In the above technical solution, sealing can be implemented from the source of the injection hole, thereby reducing the probability of foreign matter contaminating the injection hole, and the second sealing member is covered at the liquid inlet end of the injection hole to facilitate the rapid assembly of the second sealing member and improve the assembly efficiency of the second sealing member.

[0054] In some embodiments, the injection hole includes a first hole segment and a second hole segment arranged in sequence along the injection flow direction, the aperture of the first hole segment is larger than the aperture of the second hole segment, and at least a portion of the second seal is embedded in the first hole segment and covers the second hole segment.

[0055] In the above technical solution, since the part of the second seal embedded in the first hole section can cover the second hole section, the injection hole can be reliably sealed. In addition, since the aperture of the first hole section is relatively large, at least the second seal is embedded in the first hole section, which is convenient for the assembly and positioning of the second seal, and is conducive to eliminating the positioning fixture used for connection, and is convenient for the connection between the second seal and the pole cover. Moreover, the space occupied by the second seal outside the pole cover can be reduced, which is conducive to reducing the overall size of the battery cell.

[0056] In some embodiments, an edge of the second sealing member is sealingly connected to a hole wall of the first hole segment.

[0057] In the above technical solution, by connecting the edge of the second seal to the hole wall of the first hole segment, it is shown that in the radial direction of the first hole segment, the second seal can be completely received in the first hole segment, which is beneficial to further reduce the space occupied by the second seal outside the pole cover plate, improve the compactness of the cooperation between the second seal and the pole cover plate, and utilize the hole wall of the first hole segment to stop and limit the edge of the second seal, so as to improve the stability and reliability of the connection between the second seal and the pole cover plate.

[0058] In some embodiments, the second sealing member includes an extension portion, which extends outside the first hole section and overlaps and is sealingly connected to a side wall of the pole cover plate away from the accommodating cavity.

[0059] In the above technical solution, it is beneficial to increase the connection area between the second seal and the pole cover, thereby improving the connection reliability between the second seal and the pole cover. Moreover, the shape requirements for the first hole segment are relatively low, and there is no need to set the edge of the second seal and the hole wall of the first hole segment to match the shape and meet the required clearance fit, thereby reducing the processing accuracy of the pole cover and the second seal, improving production efficiency, and reducing production costs.

[0060] In some embodiments, the injection hole forms a step surface at the connection between the first hole segment and the second hole segment, and the portion of the second sealing component embedded in the first hole segment is supported on the step surface.

[0061] In the above technical solution, by supporting the portion of the second sealing member embedded in the first hole section on the step surface, the connection stability between the second sealing member and the pole cover plate can be improved.

[0062] In some embodiments, the sealing structure includes: a first sealing member, the first sealing member is interference-sealed with the second hole segment and is located on a side of the second sealing member close to the accommodating cavity.

[0063] In the above technical solution, the sealing structure includes both the first sealing member and the second sealing member. The second sealing member can prevent the first sealing member from falling out of the injection hole, thereby improving the reliability of the sealing fit between the first sealing member and the second hole section, and thus improving the sealing reliability of the sealing structure as a whole for the injection hole. In addition, the first sealing member is fixed by means of interference fit, which is conducive to the rapid installation of the first sealing member.

[0064] In some embodiments, the second seal includes an avoidance portion protruding in a direction away from the first seal, a side of the avoidance portion facing the first seal forms an avoidance cavity, and a portion of the first seal extends into the avoidance cavity.

[0065] In the above technical solution, the compactness of the cooperation between the first seal and the second seal can be improved, the space occupied and wasted can be reduced, and the volume of the battery cell can be reduced. Moreover, the second seal is in a concave-convex form, which can improve the structural strength of the second seal and improve the reliability and stability of the cooperation between the second seal and the pole cover.

[0066] In some embodiments, the second seal includes a central portion and an edge portion arranged around the central portion, the central portion is embedded in the injection hole, and the edge portion overlaps and is sealed to a portion of the side wall of the pole cover away from the accommodating cavity surrounding the injection hole.

[0067] In the above technical solution, the shape requirements of the injection hole are relatively low, and there is no need to thicken the pole cover plate in order to process the injection hole into a complex shape, so that the pole cover plate can be thinned, and the positioning and matching of the second seal and the pole cover plate are stable, which is conducive to improving the connection stability and reliability of the second seal and the pole cover plate, and the matching of the second seal and the pole cover plate is compact, which is conducive to saving space. In addition, the overlap and connection method of the second seal and the pole cover plate is conducive to the quick connection of the two.

[0068] 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.

[0069] In the above technical solution, the position of the pole structure can be flexibly designed, thereby increasing the application range of the battery cell.

[0070] 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.

[0071] 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.

[0072] In some embodiments, the confluence component is connected to a surface of the pole cover plate on one side away from the accommodating cavity to form a second connection portion, and the injection hole and the second connection portion are staggered.

[0073] In the above technical solution, when electrolyte overflows from the injection hole, the contamination and corrosion of the second connecting part by the electrolyte can be reduced, and the sealing structure covering the injection hole can be prevented from affecting the connection between the busbar component and the pole cover, thereby improving the connection convenience and connection reliability between the busbar component and the pole cover.

[0074] In some embodiments, a boundary portion is formed on a surface of the pole cover plate on one side away from the accommodating cavity, and the boundary portion is located between the second connecting portion and the liquid injection hole.

[0075] In the above technical solution, the boundary portion is a concave structure or a convex structure. When electrolyte overflows from the injection hole, it can be blocked by the boundary portion to reduce the probability of the electrolyte contacting the second connection portion, thereby reducing the contamination and corrosion of the second connection portion by the electrolyte. In addition, by setting the boundary portion, it can play a marking role, so that the connection position of the converging component and the pole cover can be far away from the injection hole, thereby further reducing the possibility of the electrolyte overflowing from the injection hole contacting the second connection portion.

[0076] 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.

[0077] 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

[0078] 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.

[0079] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0080] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0081] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0082] Figure 4 A schematic diagram of an orthographic projection of a battery cell provided in some embodiments of the present application;

[0083] Figure 5 For along Figure 4 Sectional view of the mid-MM line;

[0084] Figure 6 for Figure 5 A partial enlarged view of

[0085] Figure 7 A schematic diagram of the matching of the pole body and the conductive part provided in some embodiments of the present application;

[0086] Figure 8 A schematic diagram of the matching of the pole body and the conductive part provided in some embodiments of the present application;

[0087] Fig. 9 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0088] Fig.10 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0089] Fig.11 for Fig.10 The enlarged partial view of the F1 part circled in the middle;

[0090] Fig.12 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0091] Fig.13 A partial cross-sectional view of a pole cover provided in some embodiments of the present application;

[0092] Fig.14 A cross-sectional view of the pole cover plate and the sealing structure provided in some embodiments of the present application;

[0093] Fig.15 A partial cross-sectional view of a pole cover provided in some embodiments of the present application;

[0094] Fig.16 A partial cross-sectional view of a pole cover provided in some embodiments of the present application;

[0095] Fig.17 A partial cross-sectional view of a pole cover provided in some embodiments of the present application;

[0096] Fig.18 A schematic diagram of the coordination between the pole structure and the sealing structure provided in some embodiments of the present application;

[0097] Fig.19A cross-sectional view of the pole cover plate and the sealing structure provided in some embodiments of the present application;

[0098] Fig. 20 A cross-sectional view of the pole cover plate and the sealing structure provided in some embodiments of the present application;

[0099] Fig.21 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0100] Fig. 22 A schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0101] Figures: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; box 101; first box body 1011; second box body 1012; battery cell 102; pole structure 1020; shell 1; accommodating chamber 1A; first shell wall 11; second shell wall 12; pole body 2; connecting channel 2A; first accommodating groove 211; groove bottom wall 2110; second accommodating groove 212; connecting hole 22; first connecting hole 221; second connecting hole 222; liquid hole 23; sink 25; matching gap 26; outer stopper 271; inner stopper Part 272; sealing structure 1022; pole cover 3; liquid injection hole 31; liquid inlet end 31a; liquid outlet end 31b; first hole section 311; second hole section 312; third hole section 313; step surface 314; overlapping part 32; first cover part 331; second cover part 332; boundary part 34; first seal 4; second seal 5; extension part 51; central part 52; edge part 53; avoidance part 54; avoidance cavity 55; sealing pad 1023; insulating pad 1024; battery cell assembly 7; active material coating part 71; conductive part 72; first connecting part 73; conduit component 103; second connecting part 104. DETAILED DESCRIPTION

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] The term "plurality" used in the present application refers to two or more (including two).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0116] 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. In addition, for sealing considerations, it is necessary to weld sealing pins on the top cover to block 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 problems 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 thinness of the top cover and affect the improvement of the energy density of the battery cell. In addition, in order to ensure the insulation at the sealing pins and avoid interference between the sealing pins and the battery cell components in the shell, the lower plastic structure under the top cover needs to be thickened. The thickened lower plastic structure not only leads to higher material costs, but also occupies more space in the accommodating cavity, affecting the improvement of the energy density of the battery cell.

[0117] To this end, an embodiment of the present application proposes a battery cell, the battery cell comprising: a shell, a pole body and a pole cover plate, the shell defines a receiving cavity, the pole body is arranged on the shell, a connecting channel connected to the receiving cavity is formed on the pole body, the pole cover plate is arranged on the pole body, and an injection hole connected to the connecting channel is formed on the pole cover plate. Thus, by arranging the injection hole on the pole cover plate and cooperating with the pole body with the connecting channel, the electrolyte is injected into the pole structure composed of the pole body and the pole cover plate, and there is no need to separately open the injection hole on the shell of the battery cell, so the injection hole will not occupy the space of the shell separately, and the pole structure does not need to be reduced in size to avoid the injection hole, so that the area and flow area of ​​the pole structure 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, and increasing the area of ​​the pole structure is also conducive to the assembly connection of the pole structure 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 structure, it is conducive to miniaturization and lightweight of the shell.

[0118] Moreover, there is no need to perform special processing on the shell in order to open a separate injection hole on the shell, which 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 nails on the shell, which can further simplify the structure and processing of the shell, and there is no need to thicken the shell as a whole in order to weld the sealing nails on the shell, which is conducive to meeting the requirements of thin and light 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.

[0119] Moreover, according to the battery cell of the embodiment of the present application, by setting the injection hole on the pole cover plate, the manufacturing and processing of the injection hole can be facilitated, so that the size, shape, etc. of the injection hole can more easily meet the design requirements and application needs, which is beneficial to reduce the processing difficulty of the injection hole and reduce the processing cost of the injection hole.

[0120] Furthermore, by arranging the injection hole on the pole cover plate, the pole cover plate also has a pole body on one side close to the accommodating cavity. Therefore, even if a sealing nail is arranged at the injection hole, the pole body is still separated from the lower plastic structure and the sealing nail. Therefore, the lower plastic structure does not need to be thickened to ensure the insulation at the sealing nail, nor does it need to be thickened to avoid the interference of the longer sealing nail with the battery cell assembly. Therefore, it is beneficial to thin the lower plastic structure, reduce material costs, and reduce the space occupied by the lower plastic structure in the accommodating cavity, which is beneficial to improve the energy density of the battery cell.

[0121] In addition, according to the battery cell of the embodiment of the present application, by setting an injection hole on the pole cover plate and setting a connecting channel on the pole body, the injection path can be extended to a certain extent, which can play a role of injection buffer to a certain extent, and it is beneficial to reduce the possibility of splashing and overflowing of electrolyte when the battery cell is injected or working.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] Please refer to Figure 2 , Figure 2An 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.

[0127] 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.

[0128] 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 3 In 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.

[0129] According to some embodiments of the present application, Figure 4-Figure 6The battery cell 102 includes: a shell 1, a pole body 2 and a pole cover 3, the shell 1 defines a accommodating chamber 1A, the pole body 2 is arranged on the shell 1, a connecting channel 2A connected to the accommodating chamber 1A is formed on the pole body 2, the pole cover 3 is covered on the pole body 2, and a liquid injection hole 31 connected to the connecting channel 2A is formed on the pole cover 3.

[0130] Among them, since the pole cover plate 3 is covered on the pole body 2, the injection hole 31 is located upstream of the connecting channel 2A along the injection flow direction, that is, when the electrolyte is injected into the battery cell 102, the electrolyte first flows through the injection hole 31 and then flows through the connecting channel 2A. Therefore, when the battery cell 102 needs to inject electrolyte into the accommodating cavity 1A, the electrolyte can be injected into the injection hole 31. Since the injection hole 31 is connected with the connecting channel 2A, the electrolyte entering the injection hole 31 can flow into the connecting channel 2A, and since the connecting channel 2A is connected with the accommodating cavity 1A, the electrolyte entering the connecting channel 2A can flow into the accommodating cavity 1A, thereby realizing the injection of liquid into the accommodating cavity 1A through the injection hole 31 and the connecting channel 2A.

[0131] It is worth noting that the location of the pole body 2 on the shell 1 is not limited. For example, the shell 1 may include a first shell wall 11, and the pole body 2 may be arranged on the first shell wall 11. Exemplarily, 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 is located at the top of the shell 1, and the pole cover plate 3 is covered on the upper end of the pole body 2. The injection hole 31 is located above the connecting channel 2A. When the electrolyte is injected into the injection hole 31, the electrolyte passes through the injection hole 31 downward and enters the connecting channel 2A, and then flows downward from the connecting channel 2A 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 hole 31 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.

[0132] According to the battery cell 102 of the embodiment of the present application, by setting the injection hole 31 on the pole cover plate 3 and cooperating with the pole body 2 having the connecting channel 2A, the electrolyte is injected into the pole structure 1020 composed of the pole body 2 and the pole cover plate 3, and there is no need to separately open the injection hole 31 on the shell 1 of the battery cell 102, so the injection hole 31 will not occupy the space of the shell 1 alone, and the pole structure 1020 does not need to be reduced in size to avoid the injection hole 31, so that the area and flow area of ​​the pole structure 1020 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. In addition, the increase in the area of ​​the pole structure 1020 is also conducive to the assembly connection of the pole structure 1020 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 structure 1020, it is conducive to miniaturization and lightness of the shell 1.

[0133] Furthermore, there is no need to perform special processing on the shell 1 in order to separately open the injection hole 31 on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1. Moreover, there is no need to partially thicken the shell 1 in order to weld the sealing nail on the shell 1, which can further simplify the structure and processing of the shell 1, and there is no need to thicken the shell 1 as a whole in order to weld the sealing nail on the shell 1, which is conducive to meeting the requirements of thinness of the shell 1, and is conducive to improving the energy density of the battery cell 102, and is conducive to reducing the weight and material cost of the shell 1.

[0134] Moreover, according to the battery cell 102 of the embodiment of the present application, by setting the injection hole 31 on the pole cover plate 3, the manufacturing and processing of the injection hole 31 can be facilitated, so that the size, shape, etc. of the injection hole 31 can more easily meet the design requirements and application needs, which is beneficial to reduce the processing difficulty of the injection hole 31 and reduce the processing cost of the injection hole 31.

[0135] Furthermore, by setting the injection hole 31 on the pole cover 3, the pole cover 3 also has a pole body 2 on one side close to the accommodating chamber 1A. Therefore, even if a sealing nail is set at the injection hole 31, the pole body 2 is still separated from the lower plastic structure and the sealing nail. Therefore, the lower plastic structure does not need to be thickened to ensure the insulation at the sealing nail, nor does it need to be thickened to avoid the interference of the longer sealing nail with the battery cell assembly 7. Therefore, it is beneficial to thin the lower plastic structure and reduce the material cost. It also reduces the space occupied by the lower plastic structure in the accommodating chamber 1A, which is beneficial to the improvement of the energy density of the battery cell 102.

[0136] In addition, according to the battery cell 102 of the embodiment of the present application, by setting the injection hole 31 on the pole cover plate 3 and setting the connecting channel 2A on the pole body 2, the injection path can be extended to a certain extent, and the injection buffer can be played to a certain extent. When the battery cell 102 is injected or working, it is beneficial to reduce the possibility of splashing and overflowing of the electrolyte.

[0137] In some embodiments, Figure 6 As shown, the connecting channel 2A includes a first receiving groove 211 and a liquid hole 23. The first receiving groove 211 is open toward the pole cover plate 3 to connect with the injection hole 31. The liquid hole 23 passes through the groove wall of the first receiving groove 211 and connects the first receiving groove 211 and the receiving chamber 1A.

[0138] Exemplarily, the connecting channel 2A includes a first receiving groove 211 and a liquid-passing hole 23, the first receiving groove 211 is open toward the pole cover plate 3 (i.e., the side of the first receiving groove 211 away from the receiving chamber 1A is open), so that the first receiving groove 211 is connected to the injection hole 31, and the liquid-passing hole 23 penetrates the groove wall of the first receiving groove 211 away from the pole cover plate 3 (i.e., the liquid-passing hole 23 is located on the side of the first receiving groove 211 close to the receiving chamber 1A, and penetrates the groove wall of the first receiving groove 211 close to the receiving chamber 1A), so that the liquid-passing hole 23 connects the first receiving groove 211 and the receiving chamber 1A. Alternatively, the liquid-passing hole 23 can also penetrate the groove wall at other positions of the first receiving groove 211, as long as it can connect the first receiving groove 211 and the receiving chamber 1A.

[0139] When the battery cell 102 needs to inject electrolyte into the accommodating chamber 1A, the electrolyte can be injected into the injection hole 31. Since the injection hole 31 is connected to the first accommodating tank 211, the electrolyte entering the injection hole 31 can flow into the first accommodating tank 211. Since the first accommodating tank 211 is connected to the accommodating chamber 1A through the liquid hole 23, the electrolyte entering the first accommodating tank 211 can flow into the accommodating chamber 1A through the liquid hole 23, thereby realizing the injection of liquid into the accommodating chamber 1A through the injection hole 31, the first accommodating tank 211 and the liquid hole 23.

[0140] Therefore, since the communication channel 2A includes the first receiving groove 211 formed on the pole body 2, the first receiving groove 211 can play the role of caching the electrolyte, and the battery cell 102 can improve the problems of electrolyte splashing and overflowing when injecting or working. Moreover, when injecting the electrolyte, since the first receiving groove 211 can cache the electrolyte, it is beneficial to improve the injection efficiency of the electrolyte, and the groove side wall of the first receiving groove 211 (that is, the groove wall extending from the open side of the first receiving groove 211 toward the receiving cavity 1A) can block the electrolyte from splashing to a certain extent, reducing the pollution caused by the electrolyte to the outside.

[0141] In addition, it is worth mentioning that when the connecting channel 2A includes a first receiving groove 211, the liquid hole 23 can be set on the side of the first receiving groove 211 close to the receiving cavity 1A, and pass through 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 groove 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 cover plate 3 and the pole body 2 (such as welding or bonding, etc.), which can reduce corrosion pollution to the connection position.

[0142] In some embodiments of the present application, the cross-sectional shape of the first receiving groove 211 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 is as large as possible, which is conducive to improving the cache, storage and other functions of the first receiving groove 211.

[0143] Of course, the present application is not limited thereto. For example, in some embodiments of the present application, the pole body 2 may not have the first receiving groove 211, but only have the liquid hole 23, and the injection hole 31 is opposite to and connected to the liquid hole 23, thereby also meeting the injection requirements.

[0144] In some embodiments, the battery cell 102 also includes a cell assembly 7, and the 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, and the conductive portion 72 is connected to the active material coating portion 71. Exemplarily, the conductive portion 72 can be connected to the pole structure 1020 to form an electrical connection, so as to realize the output of the cell assembly 7 from the electrode at the pole structure 1020. For example, the conductive portion 72 can be welded to the pole structure 1020 to achieve 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.

[0145] Among them, 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 part 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 injection hole 31, 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 on one side of the first receiving groove 211 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 passage hole 23, 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).

[0146] 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.

[0147] In some embodiments, in combination Figure 7 , the connecting hole 22 through which the conductive part 72 is passed is the first connecting hole 221 (that is, at least one connecting hole 22 is passed through by the conductive part 72, and the connecting hole 22 through which the conductive part 72 is passed 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 passes, 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 passed also has the liquid passage function, that is, the first connecting hole 221 still has a liquid passage gap after passing through the conductive part 72. During liquid injection, the electrolyte can be injected into the first containing groove 211 through the liquid injection hole 31, and then at least part of the electrolyte can flow into the containing cavity 1A from the first connecting hole 221 through which the conductive part 72 is passed.

[0148] In some embodiments, in combination Figure 8The 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.

[0149] 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, the electrolyte is injected into the first containing groove 211 through the injection hole 31. Then, a part of it can flow into the containing cavity 1A from the first connecting hole 221 through which the conductive part 72 is passed, and a part of it can flow into the containing cavity 1A from the second connecting hole 222 through which the conductive part 72 is not passed.

[0150] 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, the electrolyte is injected into the first containing groove 211 through the injection hole 31, and then flows into the containing cavity 1A only from the second connecting hole 222 where the conductive portion 72 is not penetrated.

[0151] 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.

[0152] 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.

[0153] 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 through the injection hole 31, it flows into the containing cavity 1A from the first connecting hole 221 penetrated by the conductive portion 72.

[0154] 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 groove 211 through the injection hole 31, 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.

[0155] 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 through the injection hole 31, it flows into the containing cavity 1A from the second connecting hole 222 having no conductive portion 72 passing through it.

[0156] In some embodiments, the first receiving groove 211 is open in a direction away from the receiving cavity 1A, the notch of the first receiving groove 211 is located on the side of the first receiving groove 211 away from the receiving cavity 1A, the groove wall on the side of the first receiving groove 211 close to the receiving cavity 1A is the groove bottom wall 2110, the conductive portion 72 is connected to the groove bottom wall 2110 to form the first connecting portion 73, and the orthographic projection of the injection hole 31 on the groove bottom wall 2110 is staggered with the first connecting portion 73. Here, "staggered" means no overlap.

[0157] For example, when the conductive portion 72 is welded to the bottom wall 2110 of the first receiving groove 211 to form a weld mark, the injection hole 31 can be set so that the orthographic projection on the bottom wall 2110 of the first receiving groove 211 is staggered from the weld mark. Thus, the electrolyte injected from the injection hole 31 can avoid the conductive portion 72 and the first connecting portion 73 (such as the weld mark) of the pole body 2 as much as possible, thereby reducing the contamination and corrosion of the first connecting portion 73 (such as the weld mark) caused by the electrolyte.

[0158] In some embodiments, in combination Figure 7 and Figure 8 The pole body 2 is formed into a long strip structure, and 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.

[0159] In some embodiments, when the pole body 2 is formed into a long strip structure, and the first communication hole 221 through which the conductive part 72 is penetrated 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, the pole cover plate 3 is a long cover plate, that is, the length of the pole cover plate 3 is greater than the width, and the injection hole 31 is eccentrically arranged in the length direction of the pole cover plate 3, that is, the injection hole 31 is located on one side of the center point of the pole cover plate 3 in the length direction of the pole cover plate 3. As a result, the injection hole 31 can avoid the conductive part 72 as much as possible, reducing the contamination and corrosion caused by the injected electrolyte to the conductive part 72 and the first connecting part 73 (such as welding marks) of the pole body 2.

[0160] In addition, since the pole body 2 is formed into a long strip structure and the pole cover 3 is an elongated cover, it is beneficial for the pole body 2 to fully cooperate with the pole cover 3, and it is convenient to increase the area of ​​the pole cover 3, which is beneficial for the assembly connection between the pole cover 3 and the pole body 2. Exemplarily, the shape of the pole cover 3 can be an oblong, a rectangular, an elliptical, etc. Among them, the oblong can also be called a runway shape, that is, the length of the rectangle is spliced ​​with semicircles at both ends. The injection hole 31 can be located in the semicircular area or at the junction of the semicircular area and the rectangular area. Of course, the present application is not limited to this. In other embodiments of the present application, the injection hole 31 can also be centered on the pole cover 3, etc., that is, the position of the injection hole 31 can be flexibly selected according to actual conditions.

[0161] In some embodiments of the present application, the pole body 2 is formed as an elongated structure, and the first receiving groove 211 is formed as an elongated 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, thereby facilitating full utilization of the space of the pole body 2, so as to increase the size of the first receiving groove 211 and improve the injection efficiency.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] For example, when the first connecting hole 221 is formed as a long strip-shaped hole whose length is greater than its 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 passage hole 23, increasing the number of the first connecting holes 221 is also conducive to improving the injection efficiency.

[0167] In some embodiments, when 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 end of the length of the first connecting hole 221, so that the electrolyte can be relatively far away from the welding mark of the conductive part 72 and the pole body 2, reducing the pollution or corrosion caused by the welding mark of the injected electrolyte. 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 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.

[0168] 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.

[0169] Of course, the present application is not limited thereto. In other embodiments of the present application, the conductive portion 72 may not pass through the connecting hole 22 and may not extend into the first receiving groove 211. Fig. 9As shown, the conductive part 72 can be connected to the side wall of the pole body 2 facing the accommodating cavity 1A, so that the conductive part 72 is located as a whole on the side of the first accommodating groove 211 close to the accommodating cavity 1A. At this time, each connecting hole 22 can be used as a liquid through hole 23. Therefore, when the electrolyte injected from the injection hole 31 enters the first accommodating groove 211, it will not contact the conductive part 72 and the first connecting part 73 of the pole body 2 (such as a weld mark), thereby reducing the contamination and corrosion of the conductive part 72 and the first connecting part 73 of the pole body 2 caused by the injected electrolyte, and the injection hole 31 can be flexibly selected to open the position, without the need to select the position of the injection hole 31 in order to avoid the conductive part 72 and the first connecting part 73 of the pole body 2.

[0170] In some embodiments, Fig.10 As shown, the connecting channel 2A also includes a second receiving groove 212, which is located on a side of the first receiving groove 211 close to the receiving chamber 1A. The second receiving groove 212 is open toward the receiving chamber 1A to connect with the receiving chamber 1A. A connecting hole 22 connecting the first receiving groove 211 and the second receiving groove 212 is formed on the pole body 2. The connecting hole 22 is one or more and at least one connecting hole 22 serves as a liquid hole 23, so that the liquid hole 23 passes through the groove wall of the second receiving groove 212 to connect the first receiving groove 211 and the second receiving groove 212.

[0171] When the battery cell 102 needs to inject electrolyte into the storage chamber 1A, the electrolyte can be injected into the injection hole 31. Since the injection hole 31 is connected to the first storage tank 211, the electrolyte entering the injection hole 31 can flow into the first storage tank 211. Since the first storage tank 211 is connected to the second storage tank 212 through the connecting hole 22, and at least one connecting hole 22 is a liquid passage hole 23 through which the electrolyte can pass, the electrolyte entering the first storage tank 211 can flow into the second storage tank 212 through the liquid passage hole 23. Since the second storage tank 212 is connected to the storage chamber 1A, the electrolyte flowing into the second storage tank 212 can enter the storage chamber 1A, thereby realizing the injection of liquid into the storage chamber 1A through the injection hole 31, the first storage tank 211, the liquid passage hole 23 and the second storage tank 212.

[0172] Therefore, the second containing tank 212 can serve as a buffer for electrolyte or gas. When the battery cell 102 is filled with liquid, the second containing tank 212 can be used to buffer the electrolyte to improve problems such as splashing and overflowing of the electrolyte. When the battery cell 102 is working, the electrolyte will produce gas after participating in the reaction. The second containing tank 212 can be used to buffer the electrolyte or the gas generated in the containing cavity 1A, thereby improving the problem of electrolyte overflow or excessive gas pressure in the containing cavity 1A, thereby improving the reliability of the battery cell 102.

[0173] In some embodiments, Fig.10 As shown, when the pole body 2 has a second receiving groove 212, the conductive part 72 can pass through at least one connecting hole 22 and extend into the first receiving groove 211. The hole through which the conductive part 72 passes is the first connecting hole 221. At this time, the first connecting hole 221 can be used as a liquid hole 23, and the first connecting hole 221 may not be used as a liquid hole 23, and the connecting hole 22 connecting the first receiving groove 211 and the second receiving groove 212 can be set to also include at least one second connecting hole 222 without the conductive part 72, and the second connecting hole 222 can be used as a liquid hole 23. The above can refer to the description of the above-mentioned embodiment without the second receiving groove 212, which will not be repeated here.

[0174] For example, when the pole body 2 has a second receiving groove 212, Fig. 9 As 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.

[0175] Furthermore, when the pole body 2 has a second receiving groove 212, and the conductive portion 72 is connected to the 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. Therefore, when the electrolyte injected from the injection hole 31 enters the first receiving groove 211, it will not contact the conductive portion 72 in the second receiving groove 212 and the first connecting portion 73 of the pole body 2 (such as a weld mark), thereby reducing the contamination and corrosion of the conductive portion 72 and the first connecting portion 73 of the pole body 2 caused by the injected electrolyte, so that the injection hole 31 can be flexibly selected to open, and there is no need to select the position of the injection hole 31 in order to avoid the conductive portion 72 and the first connecting portion 73 of the pole body 2.

[0176] In some embodiments of the present application, the injection hole 31 is arranged opposite to the liquid passage hole 23. That is to say, along the axial direction of the injection hole 31, the orthographic projection of the liquid passage hole 23 overlaps with at least part of the orthographic projection of the injection hole 31. As a result, the electrolyte injected through the injection hole 31 can flow directly toward the liquid passage hole 23 arranged opposite to the injection hole 31, so that the injection can be achieved more quickly and efficiently, thereby improving the injection efficiency. It is worth noting that the number of the injection holes 31 and the liquid passage holes 23 is not limited, and there can be at least one injection hole 31 and at least one liquid passage hole 23, and at least one injection hole 31 and at least one liquid passage hole 23 can be arranged opposite to each other. In addition, it is worth noting that the shapes of the injection hole 31 and the liquid passage hole 23 can be the same or different, and can be flexibly selected according to actual conditions.

[0177] Exemplarily, when the connecting hole 22 does not include the second connecting hole 222 but only includes the first connecting hole 221, the first connecting hole 221 serves as the liquid passage hole 23. At this time, the injection hole 31 can be arranged opposite to the first connecting hole 221, that is, along the axial direction of the injection hole 31, the orthographic projection of the first connecting hole 221 overlaps at least part of the orthographic projection of the injection hole 31. Thus, the electrolyte injected through the injection hole 31 can flow directly toward the direction of the first connecting hole 221 arranged opposite to the injection hole 31, so that the injection can be realized quickly and efficiently, thereby improving the injection efficiency.

[0178] For example, when the pole body 2 has both the first connecting hole 221 and the second connecting hole 222, and at least the second connecting hole 222 is used as the liquid passage hole 23, the second connecting hole 222 may be arranged opposite to the liquid injection hole 31, that is, along the axial direction of the liquid injection hole 31, the orthographic projection of the second connecting hole 222 overlaps at least part of the orthographic projection of the liquid injection hole 31. Thus, the electrolyte injected through the liquid injection hole 31 may flow directly toward the direction of the second connecting hole 222 arranged opposite to the liquid injection hole 31, so that the liquid injection may be realized quickly and efficiently, thereby improving the liquid injection efficiency.

[0179] Furthermore, the first connecting hole 221 and the injection hole 31 may be staggered, that is, the orthographic projection of the first connecting hole 221 and the orthographic projection of the injection hole 31 are not overlapped along the axial direction of the injection hole 31, so that the electrolyte injected from the injection hole 31 can avoid the direction of the first connecting hole 221, so as to reduce the risk of the electrolyte contaminating the conductive part 72 and the first connecting part 73 of the pole body 2 that penetrate the first connecting hole 221. However, it is not limited to this. In some embodiments of the present application, the injection hole 31 may also be arranged to be opposite to both the second connecting hole 222 and the first connecting hole 221 as needed.

[0180] In addition, when the conductive portion 72 is connected to the side wall of the pole body 2 facing the accommodating cavity 1A (regardless of whether the connecting channel 2A includes the second accommodating groove 212), each connecting hole 22 can be used as a liquid hole 23. In some embodiments, a liquid injection hole 31 can be arranged opposite to at least one connecting hole 22, and each connecting hole 22 is staggered with the conductive portion 72 and the first connecting portion 73 (such as a weld mark) of the pole body 2. That is to say, along the axial direction of the liquid injection hole 31, the orthographic projection of each connecting hole 22 does not overlap with the orthographic projection of the first connecting portion 73, thereby reducing the contamination and corrosion of the weld mark by the electrolyte while improving the liquid injection efficiency.

[0181] It can be understood that the pole cover plate 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 plate 3 is covered on the pole body 2, so that the injection hole 31 on the pole cover plate 3 can be located upstream of the connecting channel 2A on the pole body 2. However, it is worth noting that the assembly method of the pole cover plate 3 and the pole body 2 is not limited, for example, the pole cover plate 3 can be completely located outside the pole body 2 (i.e., the side away from the accommodating cavity 1A), or the pole cover plate 3 can also be partially embedded in the pole body 2.

[0182] For example, in some embodiments of the present application, Figure 6 As shown, at least part of the pole cover 3 is embedded in the first receiving groove 211. Since the first receiving groove 211 is used as part of the connecting channel 2A, it means that a cavity is formed between the pole cover 3 and the groove wall of the first receiving groove 211. In this way, while the pole cover 3 occupies the space in the first receiving groove 211, it is ensured that there is still space in the first receiving groove 211 for the electrolyte to flow, so that the electrolyte injected from the injection hole 31 of the pole cover 3 can enter the liquid hole 23 through the cavity, thereby meeting the injection demand, and the cavity can also serve as a buffer for the electrolyte, improving the problems of electrolyte splashing and overflow. In addition, 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, which is conducive to improving the working reliability of the battery cell 102. When the battery cell 102 is produced, the cavity can also buffer the injected electrolyte, improve the overflow of the electrolyte, and improve the injection efficiency. In addition, by embedding at least a portion of the pole cover plate 3 in the first receiving groove 211 , the space occupied by the pole cover plate 3 outside the pole body 2 can be reduced, thereby improving the compactness of the structure.

[0183] In some embodiments of the present application, Fig.10As shown, the edge of the pole cover plate 3 has a lap portion 32, and the lap portion 32 is lapped on the side of the pole body 2 away from the accommodating cavity 1A. As a result, the matching and connection between the pole cover plate 3 and the pole body 2 are facilitated, and the height of the cavity between the pole cover plate 3 and the groove wall of the first accommodating groove 211 is easily controlled, so that the volume of the cavity meets the design requirements. Moreover, when the lap portion 32 is welded to the pole body 2, and the pole body 2 has a liquid hole 23, the lap 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 lap portion 32 and the pole body 2, thereby improving the corrosion, pollution and other problems caused to the welding point.

[0184] For example, Fig.10 As shown, when the communication channel 2A includes the first accommodating groove 211, the surface of the 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, thereby 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, thereby 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, thereby helping to reduce the space occupied outside the pole body 2.

[0185] In some embodiments of the present application, Fig.10 and Fig.11 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.

[0186] In some embodiments of the present application, the shape of the pole cover 3 matches the cross-sectional shape of the first receiving groove 211. Thus, the pole cover 3 can be used to cover the first receiving groove 211. When the injection hole 31 on the pole cover 3 is sealed, the sealing of the first receiving groove 211 can be achieved, thereby simplifying the sealing measures for the first receiving groove 211, saving the use of parts, simplifying the structure, facilitating assembly, and reducing costs. Furthermore, 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.

[0187] In some embodiments of the present application, Fig.10 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.

[0188] 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.

[0189] 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.

[0190] For example, Fig.10As 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 caused by 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 15%, thereby ensuring sealing.

[0191] In some embodiments of the present application, the injection hole 31 is provided on the pole cover plate 3 of the cathode, and the pole cover plate 3 of the cathode is made of the same material as the pole body 2 of the cathode. Exemplarily, the pole cover plate 3 is to be welded to the pole body 2, and the pole cover plate 3 is also to be welded to the converging component 103. When the pole cover plate 3 and the pole body 2 are made of the same material, the welding yield of the two is high. When the pole cover plate 3 and the converging component 103 are made of the same material, the welding yield of the two is high. Among them, the material of the cathode pole body 2 is usually aluminum, and the material of the cathode collector component 103 is usually aluminum. Therefore, the material of the cathode pole cover 3 can also be aluminum, so that the cathode pole cover 3 and the cathode pole body 2 and the cathode collector component 103 respectively have a good welding yield. When the injection hole 31 is set on the cathode pole cover 3, the electrolyte flows to the welding point between the cathode pole cover 3 and the cathode pole body 2. Since the welding point is a combination of the same material (such as aluminum and aluminum), it is not easy to cause corrosion to the welding point, which is beneficial to improve the connection reliability between the pole cover 3 and the pole body 2.

[0192] In some embodiments of the present application, Fig.12 The pole cover 3 includes a first cover portion 331 and a second cover portion 332. The first cover portion 331 is made of the same material as the pole body 2. The first cover portion 331 is connected to the pole body 2, and the second cover portion 332 is connected to the first cover portion 331. The injection hole 31 is arranged on the first cover portion 331 or the second cover portion 332. In the above technical solution, when the injection hole 31 is arranged on the pole cover 3 of the composite material, when the first cover portion 331 is made of the same material as the pole body 2, the electrolyte flows to the welding point between the first cover portion 331 and the pole body 2. Since the welding point is a combination of the same material, it is not easy to cause corrosion to the welding point, which is conducive to improving the connection reliability between the pole cover 3 and the pole body 2.

[0193] It is worth noting that there is no limit to the assembly method of the first cover plate portion 331 and the second cover plate portion 332. For example, by making an orthographic projection along the axial direction of the injection hole 31, the orthographic projection of the first cover plate portion 331 and the orthographic projection of the second cover plate portion 332 have non-overlapping parts, and the injection hole 31 can be set on the non-overlapping part. In this way, the injected electrolyte is not easy to cause corrosion and pollution to the welding point between the first cover plate portion 331 and the second cover plate portion 332, which is beneficial to improve the reliability of the pole cover 3.

[0194] Exemplarily, the anode pole body 2 is usually made of copper, and the material of the anode collector component 103 is usually made of aluminum. If the anode pole cover 3 is made of aluminum, when the injection hole 31 is set on the anode pole cover 3, the electrolyte flows to the welding point between the anode pole cover 3 and the anode pole body 2. Since the welding point is a combination of different materials (such as aluminum and copper), it is easy to cause corrosion to the welding point. To this end, in some embodiments of the present application, the anode pole cover 3 can be set to a copper-aluminum composite material, and the first cover portion 331 of the anode pole cover 3 made of copper is welded to the anode pole body 2, and the second cover portion 332 of the anode pole cover 3 made of aluminum is welded to the anode collector 103, so that the anode pole cover 3 and the anode pole body 2 and the anode collector 103 respectively have a good welding yield. In this way, when the injection hole 31 is set on the anode pole cover 3 of the composite material, it can be set on the first cover portion 331 or on the second cover portion 332. The electrolyte flows to the welding point between the anode pole cover 3 and the anode pole body 2. Since the welding point is a combination of the same material (such as copper copper), it is not easy to cause corrosion to the welding point, which is beneficial to improve the connection reliability between the pole cover 3 and the pole body 2.

[0195] It is worth noting that the shape and size of the injection hole 31 are not limited and can be selected according to actual conditions.

[0196] In some embodiments of the present application, Fig.13 and Fig.14 As shown, the flow area of ​​the liquid inlet end 31a of the injection hole 31 is larger than the flow area of ​​the liquid outlet end 31b of the injection hole 31. When the electrolyte is injected into the injection hole 31, it flows from the liquid inlet end 31a to the liquid outlet end 31b. The flow area of ​​the liquid inlet end 31a of the injection hole 31 is set to be larger than the flow area of ​​the liquid outlet end 31b of the injection hole 31, which is convenient for the cooperation between the injection hole 31 and the injection nozzle, for example, it is convenient for the injection nozzle to be inserted into the liquid inlet end 31a of the injection hole 31, which is conducive to reducing the probability of leakage during the electrolyte injection process. Moreover, since the flow area of ​​the liquid inlet end 31a of the injection hole 31 is relatively large, it is convenient to install the sealing structure 1022 to achieve the sealing of the injection hole 31.

[0197] In some embodiments of the present application, Fig.15 The injection hole 31 includes a first hole segment 311 and a second hole segment 312, that is, in some embodiments, the injection hole 31 includes at least the first hole segment 311 and the second hole segment 312, and the first hole segment 311 is located upstream of the second hole segment 312 along the injection flow direction, and the flow area of ​​the first hole segment 311 gradually decreases or remains unchanged along the direction from the first hole segment 311 to the second hole segment 312, and the flow area of ​​the second hole segment 312 gradually decreases or remains unchanged along the direction from the first hole segment 311 to the second hole segment 312, and the flow area of ​​the outlet end of the first hole segment 311 is greater than or equal to the flow area of ​​the inlet end of the second hole segment 312, so that the flow area of ​​the liquid inlet end 31a of the injection hole 31 can be greater than the flow area of ​​the liquid outlet end 31b of the injection hole 31.

[0198] Therefore, when the electrolyte is injected into the injection hole 31, it first flows through the first hole segment 311 and then flows through the second hole segment 312. Since the flow area of ​​the first hole segment 311 gradually decreases or remains unchanged along the direction from the first hole segment 311 to the second hole segment 312, the flow area of ​​the second hole segment 312 gradually decreases or remains unchanged along the direction from the first hole segment 311 to the second hole segment 312, and the flow area of ​​the outlet end of the first hole segment 311 is greater than or equal to the flow area of ​​the inlet end of the second hole segment 312, which means that the flow area of ​​the first hole segment 311 is relatively large, so that the first hole segment 311 is easy to cooperate with the injection nozzle, and the first hole segment 311 can play the role of buffering the electrolyte, which is beneficial to improve the injection efficiency and reduce the risk of splashing and overflowing of the electrolyte. It is also convenient to assemble the sealing structure 1022 to the injection hole 31 to achieve reliable sealing of the injection hole 31 after injection.

[0199] In some embodiments of the present application, Fig.16 The injection hole 31 is composed of a first hole segment 311 and a second hole segment 312, that is, the injection hole 31 only includes the first hole segment 311 and the second hole segment 312. The inlet end of the first hole segment 311 constitutes the liquid inlet end 31a of the injection hole 31, and the outlet end of the second hole segment 312 constitutes the liquid outlet end 31b of the injection hole 31. The flow area of ​​the first hole segment 311 gradually decreases along the direction from the first hole segment 311 to the second hole segment 312, and the flow area of ​​the outlet end of the first hole segment 311 is equal to the flow area of ​​the inlet end of the second hole segment 312.

[0200] Therefore, the injection hole 31 is a two-section type, and the first hole section 311 is roughly funnel-shaped. The side wall of the first hole section 311 can have a diversion effect, so that the electrolyte entering the first hole section 311 can quickly flow in the direction of the second hole section 312, thereby improving the injection efficiency. Moreover, since the flow area at the outlet end of the first hole section 311 is equal to the flow area at the inlet end of the second hole section 312, no step surface is formed between the first hole section 311 and the second hole section 312. Combined with the funnel shape of the first hole section 311, it is not easy for liquid to accumulate in the first hole section 311.

[0201] In some embodiments of the present application, Fig.17 The injection hole 31 also includes a third hole segment 313, which is located between the first hole segment 311 and the second hole segment 312 along the injection flow direction. The flow area of ​​the third hole segment 313 gradually decreases along the direction from the first hole segment 311 to the second hole segment 312. The flow area at the inlet end of the third hole segment 313 is less than or equal to the flow area at the outlet end of the first hole segment 311, and the flow area at the outlet end of the third hole segment 313 is equal to the flow area at the inlet end of the second hole segment 312.

[0202] Therefore, when the electrolyte is injected into the injection hole 31, it first flows through the first hole segment 311, then flows through the third hole segment 313, and finally flows through the second hole segment 312. The flow area of ​​the inlet end of the third hole segment 313 is less than or equal to the flow area of ​​the outlet end of the first hole segment 311, which means that the flow area of ​​the first hole segment 311 is relatively large, making it easy for the first hole segment 311 to cooperate with the injection nozzle. Moreover, the first hole segment 311 can serve as a buffer for the electrolyte, which is beneficial to improving the injection efficiency and reducing the risk of splashing and overflowing of the electrolyte. It is also convenient to assemble the sealing structure 1022 to the injection hole 31 to achieve reliable sealing of the injection hole 31 after injection. Moreover, since the flow area of ​​the third hole segment 313 gradually decreases along the direction from the first hole segment 311 to the second hole segment 312, the third hole segment 313 is generally funnel-shaped, and the side wall of the third hole segment 313 can have a diversion effect, so that the electrolyte entering the third hole segment 313 can quickly flow in the direction of the second hole segment 312, thereby improving the injection efficiency. In addition, since the flow area of ​​the outlet end of the third hole segment 313 is equal to the flow area of ​​the inlet end of the second hole segment 312, no step surface is formed between the third hole segment 313 and the second hole segment 312. Combined with the funnel shape of the third hole segment 313, it is not easy for liquid to accumulate in the third hole segment 313.

[0203] It is worth noting that, in some embodiments of the present application, after the liquid is injected, in order to ensure the sealing of the liquid injection hole 31, a sealing structure 1022 may be provided at the liquid injection hole 31. Fig.14A sealing structure 1022 may be provided to cooperate with the pole cover plate 3 to seal the injection hole 31 , thereby ensuring the sealing of the injection hole 31 , preventing the electrolyte from overflowing, and preventing external foreign matter from entering the accommodating cavity 1A from the injection hole 31 , thereby improving the reliability of the battery cell 102 .

[0204] In some embodiments, Fig.14 As shown, the pole cover plate 3 does not have a portion that stops at the outside of the sealing structure 1022 (i.e., the side away from the accommodating chamber 1A), so that the sealing structure 1022 is suitable for being installed to the pole cover plate 3 from the outside of the pole cover plate 3 (i.e., the side away from the accommodating chamber 1A). In this way, by setting the sealing structure 1022 to be installed to the pole cover plate 3 from the outside of the pole cover plate 3 to seal the injection hole 31, the sealing structure 1022 is installed after the injection, which can ensure the sealing of the injection hole 31, and the installation position is close to the outside, which is convenient for the rapid assembly of the sealing structure 1022. Moreover, the installation of the sealing structure 1022 will not have an adverse effect on the connection between the pole body 2 and the pole cover plate 3, ensuring the reliability of the connection between the pole cover plate 3 and the pole body 2.

[0205] The sealing structure 1022 may be in a detachable form or in a non-detachable fixed form. Fig.18 As shown, when the sealing structure 1022 is detachable, it is convenient for maintaining the injection hole 31. For example, when electrolyte needs to be supplemented, the sealing structure 1022 can be removed, the injection hole 31 can be opened, and electrolyte can be supplemented and injected into the accommodating cavity 1A through the injection hole 31. Then, the sealing structure 1022 can be reassembled. For example, the sealing structure 1022 can be detachably connected to the pole cover plate 3 by means of threads or screws, so as to facilitate disassembly and assembly. For example, as shown in FIG. Fig.14 As shown, when the sealing structure 1022 is in a non-detachable fixed form, the sealing structure 1022 can be fixed to the pole cover plate 3 by welding, riveting, etc., so as to improve the sealing reliability of the sealing structure 1022 to the injection hole 31.

[0206] In some embodiments of the present application, Fig.14 As shown, at least part of the sealing structure 1022 is embedded in the injection hole 31. That is, the sealing structure 1022 can be fully embedded in the injection hole 31, or only part of the sealing structure 1022 can be embedded in the injection hole 31. Thus, on the one hand, the space in the injection hole 31 can be fully utilized to improve the sealing reliability of the sealing structure 1022 to the injection hole 31, and on the other hand, the height of the sealing structure 1022 protruding outside the injection hole 31 can be reduced, and the space occupied by the sealing structure 1022 outside the pole cover 3 can be reduced, which is conducive to reducing the overall size of the battery cell 102.

[0207] In some embodiments of the present application, Fig.19 and Fig. 20 As shown, the sealing structure 1022 may include a first sealing member 4, at least a portion of which is embedded in the injection hole 31 and is interference-fitted with the injection hole 31 to seal the injection hole 31. 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 injection hole 31.

[0208] In some embodiments of the present application, the sealing structure 1022 may include a second sealing member 5, which is covered at the liquid inlet end 31a of the liquid injection hole 31 and is sealed and connected to the pole cover plate 3. Specifically, "the second sealing member 5 is covered at the liquid inlet end 31a of the liquid injection hole 31" should be understood in a broad sense, and the second sealing member 5 may be covered at the outside of the liquid inlet end 31a, or may be embedded inside the liquid inlet end 31a, as long as it is located near the liquid inlet end 31a and covers the liquid inlet end 31a. In this way, sealing can be implemented from the source of the liquid injection hole 31 (i.e., the liquid inlet end 31a), thereby reducing the probability of foreign matter contaminating the liquid injection hole 31, and the second sealing member 5 is covered at the liquid inlet end 31a of the liquid injection hole 31, which facilitates the rapid assembly of the second sealing member 5 and improves the assembly efficiency of the second sealing member 5.

[0209] Specifically, the matching mode of the second seal 5 and the pole cover 3 is not limited. For example, in some embodiments, the edge of the second seal 5 can overlap the outside of the pole cover 3 (that is, the edge of the second seal 5 overlaps the side of the pole cover 3 away from the accommodating cavity 1A) and / or at least part of the second seal 5 is embedded in the injection hole 31, and the second seal 5 is sealed and welded with the pole cover 3. 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 cover 3 is achieved by welding, which can improve the reliability of the sealing connection between the second seal 5 and the pole cover 3.

[0210] In some embodiments, the injection hole 31 includes a first hole section 311 and a second hole section 312 sequentially arranged along the injection flow direction, the aperture of the first hole section 311 is larger than the aperture of the second hole section 312, that is, the flow area of ​​any cross section of the first hole section 311 is larger than the flow area of ​​any cross section of the second hole section 312, and at least part of the second sealing member 5 is embedded in the first hole section 311 and covers the second hole section 312. It is worth noting that the shape of the injection hole 31 in this embodiment can further select any of the above embodiments, for example, the flow area of ​​the first hole section 311 gradually decreases or remains unchanged along the direction from the first hole section 311 to the second hole section 312, and the flow area of ​​the second hole section 312 gradually decreases or remains unchanged along the direction from the first hole section 311 to the second hole section 312, and so on.

[0211] In the above technical solution, since the part of the second sealing member 5 embedded in the first hole section 311 can cover the second hole section 312, the injection hole 31 can be reliably sealed. In addition, since the aperture of the first hole section 311 is relatively large, at least the second sealing member 5 is embedded in the first hole section 311, which is convenient for the assembly and positioning of the second sealing member 5, and is conducive to eliminating the positioning fixture used for connection, and is convenient for the connection between the second sealing member 5 and the pole cover plate 3. Moreover, the space occupied by the second sealing member 5 outside the pole cover plate 3 can be reduced, which is conducive to reducing the overall size of the battery cell 102.

[0212] It should be noted that the cross section of the injection hole 31 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 injection hole 31 is in a multi-segment form, the cross section of each segment of the injection hole 31 can be circular, or at least one segment can have a non-circular cross section. Among them, the "aperture" of the hole segment with a non-circular cross section can be understood as the equivalent diameter of the corresponding hole segment.

[0213] In some embodiments, Fig.19 As shown, the edge of the second seal 5 is sealed and connected with the hole wall of the first hole segment 311. 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 311, it is explained that in the radial direction of the first hole segment 311, the second seal 5 can be completely received in the first hole segment 311, which is conducive to further reducing the occupation of the second seal 5 on the space outside the pole cover 3, improving the compactness of the second seal 5 and the pole cover 3, and using the hole wall of the first hole segment 311 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 cover 3 can be improved. Exemplarily, the second seal 5 can be further completely sunk into the first hole segment 311 in the axial direction of the first hole segment 311, which is conducive to further reducing the occupation of the second seal 5 on the space outside the pole cover 3.

[0214] In some embodiments, Fig. 20 As shown, the second seal 5 includes an extension portion 51, which extends outside the first hole section 311 and overlaps and is sealed to a side wall of the pole cover plate 3 away from the accommodating cavity 1A. Therefore, the radial dimension of the extension portion 51 in the first hole section 311 can be increased as needed, so as to increase the sealing connection area between the second seal 5 and the pole cover plate 3, thereby improving the sealing connection reliability between the second seal 5 and the pole cover plate 3. Moreover, the shape requirements for the first hole section 311 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 section 311 to match the shape and meet the required clearance fit, thereby reducing the processing accuracy of the pole cover plate 3 and the second seal 5, improving the production efficiency, and reducing the production cost.

[0215] In some embodiments, Fig. 20 As shown, the injection hole 31 forms a step surface 314 at the connection between the first hole section 311 and the second hole section 312, and the portion of the second sealing member 5 embedded in the first hole section 311 is supported on the step surface 314. Thus, the connection stability between the second sealing member 5 and the pole cover plate 3 can be improved.

[0216] In some embodiments, the sealing structure 1022 further includes: a first sealing member 4, which is interference-sealed in the second hole section 312 and is located on the side of the second sealing member 5 close to the accommodating chamber 1A. In the above technical solution, the sealing structure 1022 includes both the first sealing member 4 and the second sealing member 5, and the second sealing member 5 can prevent the first sealing member 4 from escaping from the injection hole 31, thereby improving the reliability of the sealing fit between the first sealing member 4 and the second hole section 312, and thus improving the sealing reliability of the sealing structure 1022 as a whole for the injection hole 31. In addition, the first sealing member 4 is fixed by interference fit, which is conducive to the rapid installation of the first sealing member 4.

[0217] In addition, when the first hole section 311 is set to the above-mentioned form of "the flow area of ​​the first hole section 311 gradually decreases or remains unchanged along the direction from the first hole section 311 to the second hole section 312, and the flow area of ​​the outlet end of the first hole section 311 is greater than or equal to the flow area of ​​the inlet end of the second hole section 312", it is beneficial to the assembly connection of the second seal 5.

[0218] In some embodiments, Fig.19 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 cover 3.

[0219] In some embodiments of the present application, Fig.19 and Fig. 20 As shown, the sealing structure 1022 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 injection hole 31 and is interference-fitted with the injection hole 31 to seal the injection hole 31. The edge of the second sealing member 5 overlaps the outside of the pole cover plate 3 (combined with the Fig. 20 , that is, the edge of the second sealing member 5 overlaps the side of the pole cover plate 3 away from the accommodating cavity 1A) and / or at least part of the second sealing member 5 is embedded in the injection hole 31 (combined with Fig.19and Fig. 20 ), the second seal 5 is welded and sealed with the pole cover 3, and the second seal 5 is located on the side of the first seal 4 away from the accommodating cavity 1A. Thus, the first seal 4 can effectively seal the injection hole 31, and the second seal 5 can not only seal the injection hole 31, but also prevent the first seal 4 from escaping from the injection hole 31, thereby improving the sealing reliability of the sealing structure 1022 on the injection hole 31.

[0220] 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.

[0221] Exemplarily, the second seal 5 can be made of the same metal material as the pole cover 3, for example, an aluminum part, which is conducive to improving the welding yield of the second seal 5 and the pole cover 3. In addition, it is worth noting that the welding method of the second seal 5 and the pole cover 3 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.

[0222] It is worth noting that laser welding has high requirements on the cleanliness of the injection hole 31. If there is residual electrolyte in the injection hole 31, 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 injection hole 31 is composed of a first hole segment 311 and a second hole segment 312, the flow area of ​​the first hole segment 311 gradually decreases along the direction from the first hole segment 311 to the second hole segment 312, and the flow area of ​​the outlet end of the first hole segment 311 is equal to the flow area of ​​the inlet end of the second hole segment 312, or the injection hole 31 also includes a third hole segment 313, and the third hole segment 313 is located between the first hole segment 311 and the second hole segment 312 along the injection flow direction, The flow area of ​​the third hole segment 313 gradually decreases along the direction from the first hole segment 311 to the second hole segment 312. When the flow area at the inlet end of the third hole segment 313 is less than or equal to the flow area at the outlet end of the first hole segment 311, and the flow area at the outlet end of the third hole segment 313 is equal to the flow area at the inlet end of the second hole segment 312, the liquid accumulation problem of the injection hole 31 can be improved, which is beneficial to improve the welding yield of the second sealing member 5 and the pole cover plate 3 and improve the sealing performance.

[0223] In some embodiments of the present application, after the pole cover 3 and the pole body 2 are welded, the electrolyte is injected from the injection hole 31 of the pole cover 3, and the electrolyte flows from the injection hole 31 through the connecting channel 2A on the pole body 2 and enters the shell 1 of the battery cell 102. No other auxiliary structures are required under the injection hole 31 and the connecting channel 2A, which can simplify the structure and reduce costs. After the injection is completed, the first seal 4 is first loaded into the injection hole 31 to achieve pre-sealing, and then the second seal 5 is loaded into the injection hole 31, and then the second seal 5 is welded to the pole cover 3 to achieve a tight seal. In addition, when the conductive part 72 needs to pass through the first connecting hole 221, the conductive part 72 is first installed and the conductive part 72 is welded to the pole body 2, and then the pole cover 3 and the pole body 2 are welded, and then the electrolyte is injected.

[0224] In some embodiments, Fig.14 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 injection hole 31, and the edge portion 53 overlaps and is sealed to the portion of the side wall of the pole cover 3 away from the accommodating cavity 1A surrounding the injection hole 31. As a result, the shape requirements of the injection hole 31 are relatively low, and there is no need to thicken the pole cover 3 in order to process the injection hole 31 into a complex shape, so that the pole cover 3 can be thinned, and the positioning and matching of the second seal 5 and the pole cover 3 are stable, which is conducive to improving the connection stability and reliability of the second seal 5 and the pole cover 3, and the second seal 5 and the pole cover 3 are compactly matched, which is conducive to saving space. In addition, the overlapping and connecting mode of the second seal 5 and the pole cover 3 is conducive to the quick connection of the two.

[0225] It is worth noting that the sealing structure 1022 may include only the first sealing member 4, or only the second sealing member 5, or may include both the first sealing member 4 and the second sealing member 5. In the above embodiments, when it is not described that the sealing structure 1022 includes both the first sealing member 4 and the second sealing member 5, it is possible to specifically select whether to set the first sealing member 4 alone or the second sealing member 5 alone, or to set both the first sealing member 4 and the second sealing member 5 at the same time according to the needs, and there is no limitation here.

[0226] In some embodiments of the present application, 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.21 As shown, the first shell wall 11 is an integrally formed cover plate. Thus, the position of the pole structure 1020 can be flexibly designed, thereby increasing the applicable scope of the battery cell 102 of the embodiment of the present application.

[0227] 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.

[0228] 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.

[0229] According to some embodiments of the present application, Figure 2 and Fig. 22 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.

[0230] 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.

[0231] In some embodiments, Fig. 22As shown, the converging component 103 is connected to the side surface (i.e., the outer surface) of the pole cover plate 3 away from the accommodating cavity 1A to form a second connecting portion 104 (for example, by welding to form a weld mark), and the injection hole 31 and the second connecting portion 104 are staggered, that is, the injection hole 31 and the second connecting portion 104 do not overlap. Therefore, when the electrolyte overflows from the injection hole 31, the contamination and corrosion of the second connecting portion 104 by the electrolyte can be reduced, and the sealing structure 1022 covering the injection hole 31 can be avoided from affecting the connection between the converging component 103 and the pole cover plate 3, thereby improving the connection convenience and connection reliability between the converging component 103 and the pole cover plate 3.

[0232] In some embodiments, Fig. 22 As shown, a boundary portion 34 is formed on one side surface (i.e., the outer surface) of the pole cover plate 3 away from the accommodating cavity 1A, and the boundary portion 34 is located between the second connection portion 104 and the injection hole 31. It is worth noting that the boundary portion 34 is a recessed structure or a protruding structure. When electrolyte overflows from the injection hole 31, it can be blocked by the boundary portion 34, for example, it can be accumulated in the recessed structure, or blocked by the protruding structure, so as to reduce the probability of the electrolyte contacting the second connection portion 104, thereby reducing the contamination and corrosion of the second connection portion 104 by the electrolyte. Moreover, by setting the boundary portion 34, it can play a marking role, so that the connection position of the confluence component 103 and the pole cover plate 3 can be far away from the injection hole 31, thereby further reducing the electrolyte overflowing from the injection hole 31 from contacting the second connection portion 104. It is worth noting that the shape and size of the boundary portion 34 are not limited, as long as it can block the injection hole 31 to a certain extent.

[0233] 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.

[0234] 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.

[0235] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0236] Reference Figure 4-Figure 6The battery cell 102 includes a shell 1 and a cell assembly 7, the shell 1 defines a accommodating chamber 1A, a pole body 2 is provided on the shell 1, a pole cover 3 is provided on the pole body 2, a connecting channel 2A connected to the accommodating chamber 1A is formed on the pole body 2, a liquid injection hole 31 is formed on the pole cover 3 and the liquid injection hole 31 is connected to the connecting channel 2A, the 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 chamber 1A, and the conductive portion 72 connects the active material coating portion 71 and the pole body 2.

[0237] Reference Figure 4-Figure 6 A first receiving groove 211 and a connecting hole 22 are formed on the pole body 2. The first receiving groove 211 is open toward the pole cover plate 3 to connect with the injection hole 31. The connecting hole 22 passes through the groove wall of the first receiving groove 211 and connects the first receiving groove 211 and the receiving cavity 1A. The conductive part 72 is penetrated by at least one connecting hole 22 to be at least partially received in the first receiving groove 211. There are one or more connecting holes 22 and at least one connecting hole 22 serves as a liquid passage hole 23. The connecting channel 2A includes the first receiving groove 211 and the liquid passage hole 23.

[0238] Combination Fig.19 The injection hole 31 includes a first hole section 311 and a second hole section 312. The first hole section 311 is located upstream of the second hole section 312 along the injection flow direction. The flow area of ​​the first hole section 311 gradually decreases along the direction from the first hole section 311 to the second hole section 312. The flow area of ​​the second hole section 312 remains unchanged along the direction from the first hole section 311 to the second hole section 312, and the flow area of ​​the outlet end of the first hole section 311 is greater than the flow area of ​​the inlet end of the second hole section 312. The battery cell 102 also includes: a first seal 4 and a second seal 5. At least part of the first seal 4 is embedded in the second hole section 312 and is sealed with the second hole section 312 by interference fit. The second seal 5 is located on the outside of the first seal 4 and covers the liquid inlet end 31a of the injection hole 31. The edge of the second seal 5 is welded and sealed to the pole cover plate 3.

[0239] When manufacturing the battery cell 102, the conductive part 72 is first inserted into the connecting hole 22 of the pole body 2 to achieve welding between the conductive part 72 and the pole body 2, and then the pole cover plate 3 is covered on the pole body 2, and electrolyte is injected from the injection hole 31 on the pole cover plate 3. The electrolyte enters the shell 1 through the connecting channel 2A on the pole body 2. After the injection is completed, the first sealing member 4 is first loaded into the injection hole 31 to achieve pre-sealing, and then the second sealing member 5 is installed in the injection hole 31, and then the second sealing member 5 is welded to the pole cover plate 3 to achieve a tight seal.

[0240] 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.

[0241] 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; A pole body, arranged in the housing, and having a communication channel connected to the accommodating cavity formed on the pole body; and The pole cover plate is arranged on the pole body, and a liquid injection hole connected with the connecting channel is formed on the pole cover plate.

2. The battery cell according to claim 1, characterized in that: The communication channel includes a first accommodating groove and a liquid hole, the first accommodating groove is open toward the pole cover plate to connect with the injection hole, and the liquid hole passes through the groove wall of the first accommodating groove and connects the first accommodating groove and the accommodating cavity.

3. The battery cell according to claim 2, 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.

4. The battery cell according to claim 3, characterized in that: The communicating hole through which the conductive part is penetrated is a first communicating hole, and at least the first communicating hole serves as the liquid passage hole.

5. The battery cell according to claim 3, 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.

6. The battery cell according to any one of claims 3 to 5, characterized in that: The notch of the first accommodating groove is located on a side of the first accommodating groove away from the accommodating cavity, the groove wall on the side of the first accommodating groove close to the accommodating cavity is a groove bottom wall, the conductive part is connected to the groove bottom wall to form a first connecting part, and the orthographic projection of the injection hole on the groove bottom wall is staggered with the first connecting part.

7. The battery cell according to any one of claims 3 to 6, characterized in that: The connecting hole through which the conductive part is penetrated is a first connecting hole. The pole body is formed into a long strip structure. The first connecting hole is formed into a long strip hole extending from one end of the pole body to the other end in the length direction.

8. The battery cell according to claim 7, characterized in that: The pole cover plate is an elongated cover plate, and the injection hole is eccentrically arranged in the length direction of the pole cover plate.

9. The battery cell according to any one of claims 3 to 8, characterized in that: The communicating hole through which the conductive part is passed is a first communicating hole. There are multiple first communicating holes and multiple conductive parts. Each of the first communicating holes is passed through by at least one conductive part.

10. The battery cell according to claim 2, characterized in that: The battery cell comprises a cell assembly, which comprises an active material coating portion received in the accommodation cavity and a conductive portion connected to the active material coating portion, wherein the conductive portion is connected to a side wall of the pole body facing the accommodation cavity.

11. The battery cell according to any one of claims 2 to 10, characterized in that: The connecting channel also includes a second receiving groove, which is located on a side of the first receiving groove close to the receiving cavity, and the second receiving groove is open toward the receiving cavity to connect with the receiving cavity, and the liquid hole passes through the groove wall of the second receiving groove to connect the first receiving groove and the second receiving groove.

12. The battery cell according to any one of claims 2 to 11, characterized in that: The liquid injection hole is arranged opposite to the liquid passage hole.

13. The battery cell according to any one of claims 2 to 12, characterized in that: At least a portion of the pole cover is embedded in the first accommodating groove.

14. The battery cell according to any one of claims 1 to 13, 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.

15. The battery cell according to any one of claims 2 to 13, characterized in that: The edge of the pole cover plate has an overlap portion, and a side surface of the pole body away from the accommodating cavity has a sink groove arranged around the first accommodating groove, and at least a part of the overlap portion is embedded in the sink groove.

16. The battery cell according to claim 15, 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.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The injection hole is arranged on the pole cover plate of the cathode, and the pole cover plate of the cathode is made of the same material as the pole body of the cathode.

18. The battery cell according to any one of claims 1 to 16, characterized in that: The pole cover includes a first cover portion and a second cover portion, the first cover portion is connected to the pole body, the first cover portion and the pole body are made of the same material, the second cover portion is connected to the first cover portion, and the injection hole is arranged on the first cover portion or the second cover portion.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The flow area of ​​the liquid inlet end of the liquid injection hole is larger than the flow area of ​​the liquid outlet end of the liquid injection hole.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The injection hole includes a first hole segment and a second hole segment. The first hole segment is located upstream of the second hole segment along the injection flow direction. The flow area of ​​the first hole segment gradually decreases or remains unchanged along the direction from the first hole segment to the second hole segment. The flow area of ​​the second hole segment gradually decreases or remains unchanged along the direction from the first hole segment to the second hole segment, and the flow area of ​​the outlet end of the first hole segment is greater than or equal to the flow area of ​​the inlet end of the second hole segment.

21. The battery cell according to claim 20, characterized in that: The injection hole consists of the first hole segment and the second hole segment, the flow area of ​​the first hole segment gradually decreases along the direction from the first hole segment to the second hole segment, and the flow area at the outlet end of the first hole segment is equal to the flow area at the inlet end of the second hole segment.

22. The battery cell according to claim 20, characterized in that: The injection hole also includes a third hole segment, which is located between the first hole segment and the second hole segment along the injection flow direction, and the flow area of ​​the third hole segment gradually decreases along the direction from the first hole segment to the second hole segment, and the flow area of ​​the inlet end of the third hole segment is less than or equal to the flow area of ​​the outlet end of the first hole segment, and the flow area of ​​the outlet end of the third hole segment is equal to the flow area of ​​the inlet end of the second hole segment.

23. The battery cell according to any one of claims 1 to 19, characterized in that: Also includes: A sealing structure cooperates with the pole cover plate and seals the liquid injection hole.

24. The battery cell according to claim 23, characterized in that: The sealing structure comprises: A first sealing member, at least a portion of which is embedded in the liquid injection hole, and the first sealing member is interference-fitted with the liquid injection hole and seals the liquid injection hole.

25. The battery cell according to claim 23, characterized in that: The sealing structure comprises: The second sealing member is covered at the liquid inlet end of the liquid injection hole and is sealed and connected to the pole cover plate.

26. The battery cell according to claim 25, characterized in that: The injection hole includes a first hole section and a second hole section sequentially arranged along the injection flow direction, the hole diameter of the first hole section is larger than the hole diameter of the second hole section, and at least a part of the second sealing member is embedded in the first hole section and covers the second hole section.

27. The battery cell according to claim 26, characterized in that: The edge of the second sealing member is sealingly connected to the hole wall of the first hole section.

28. The battery cell according to claim 26, characterized in that: The second sealing member comprises an extension portion, which extends outside the first hole section and overlaps and is sealed to a side wall of the pole cover plate away from the accommodating cavity.

29. The battery cell according to any one of claims 26 to 28, characterized in that: The injection hole forms a step surface at the connection between the first hole segment and the second hole segment, and the portion of the second sealing member embedded in the first hole segment is supported on the step surface.

30. The battery cell according to any one of claims 26 to 29, characterized in that: The sealing structure comprises: The first sealing member is interference-sealed with the second hole section and is located on a side of the second sealing member close to the accommodating cavity.

31. The battery cell according to claim 30, characterized in that: The second sealing member includes an escape portion protruding in a direction away from the first sealing member, a side of the escape portion facing the first sealing member forms an escape cavity, and a portion of the first sealing member extends into the escape cavity.

32. The battery cell according to claim 25, characterized in that: The second sealing member includes a central portion and an edge portion arranged around the central portion, the central portion is embedded in the injection hole, and the edge portion overlaps and is sealed to a portion of a side wall of the pole cover away from the accommodating cavity surrounding the injection hole.

33. The battery cell according to any one of claims 1 to 32, 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.

34. A battery, characterized in that: The invention comprises a busbar component and a battery cell according to any one of claims 1 to 33, wherein the battery cells are plural and at least two of the battery cells are electrically connected via the busbar component.

35. The battery according to claim 34, characterized in that The confluence component is connected to a surface of the pole cover plate on one side away from the accommodating cavity to form a second connecting portion, and the injection hole is staggered with the second connecting portion.

36. The battery according to claim 35, characterized in that A boundary portion is formed on a surface of the pole cover plate on one side away from the accommodating cavity, and the boundary portion is located between the second connecting portion and the liquid injection hole.

37. An electrical device, characterized in that: Comprising a battery according to any one of claims 34-36.

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