Battery cells, batteries and power consuming devices

Abstract

The battery cell includes a casing defining a receiving cavity, a pole body provided in the casing and having a communication passage communicating with the receiving cavity, and a pole cover plate provided in the pole body and having a liquid inlet hole communicating with the communication passage.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application is based on and claims priority from Chinese Patent Application No. 202311070180.6, filed on August 23, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to battery cells, batteries, and power consuming devices. [Background technology]

[0003] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. Among them, power batteries include several battery cells, and improvements in both usage performance and manufacturability of battery cells are expected. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and a power consuming device that can improve the usability and manufacturability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a casing that defines a storage cavity, a pole body provided in the casing and having a communication passage that communicates with the storage cavity, and a pole cover plate that covers the pole body and has a liquid filling hole that communicates with the communication passage.

[0006] In the above technical solution, the fill hole is located on the post cover plate and fitted into the post body having a connecting passage, allowing electrolyte to be injected through the post consisting of the post body and post cover plate. This eliminates the need for a separate fill hole in the battery cell casing. The fill hole does not occupy space in the casing, eliminating the need to reduce the post dimensions to accommodate the fill hole. This allows the post area and flow area to be increased without increasing the casing size, reducing flow resistance and improving the current flow efficiency of the battery cell. The increased post area also facilitates assembly and connection between the post and the casing. Furthermore, since the casing size does not need to be increased to accommodate the increase in post area, the casing can be made smaller and lighter. Furthermore, the separate fill hole in the casing eliminates the need for special processing on the casing, thereby reducing the complexity and processing difficulty of the casing structure. Furthermore, there is no need to partially thicken the casing to weld a seal pin to it, which further simplifies the casing structure and processing, and there is no need to thicken the entire casing to weld a seal pin to it, which helps meet the demand for a lighter and thinner casing, improves the energy density of the battery cell, and reduces the weight and material costs of the casing. Furthermore, providing the fill hole in the electrode post cover plate simplifies the manufacture and processing of the fill hole, allowing the size, shape, etc. of the fill hole to more easily meet design and application requirements, reducing the difficulty and cost of processing the fill hole. Furthermore, providing the fill hole in the electrode post cover plate and a communicating passage in the electrode post body simultaneously extends the fill path to a certain extent, providing a certain degree of buffering effect for the fill hole, which helps reduce the possibility of electrolyte splashing or spilling during battery cell filling or operation.

[0007] In some embodiments, the communication passage includes a first accommodating groove that opens toward the pole cover plate and communicates with the liquid inlet, and a liquid permeable hole that penetrates the groove wall of the first accommodating groove and communicates the first accommodating groove with the accommodating cavity.

[0008] In the above technical solution, the communication passage includes a first accommodating groove formed in the pole body, and the first accommodating groove can temporarily store the electrolyte, thereby alleviating problems such as electrolyte spilling or spillage during battery cell injection or operation. Furthermore, the first accommodating groove can temporarily store the electrolyte during electrolyte injection, which helps improve the efficiency of electrolyte injection, and the groove sidewalls of the first accommodating groove can block electrolyte spillage to a certain extent, reducing external contamination caused by the electrolyte.

[0009] In some embodiments, the battery cell includes a battery core assembly including an active material application portion accommodated in an accommodating cavity and a conductive portion connected to the active material application portion, and the pole body is formed with a communication hole that connects the first accommodating groove and the accommodating cavity, the communication hole is one or more, and at least one of the communication holes is a liquid permeable hole, and the conductive portion is inserted into the at least one communication hole and at least a portion of the conductive portion is accommodated in the first accommodating groove.

[0010] In the above technical solution, by accommodating at least a portion of the conductive part in the first accommodating groove, at least a portion of the conductive part occupies a space in the first accommodating groove, thereby reducing the space in the accommodating cavity occupied by the conductive part, and saving space in the accommodating cavity to accommodate an active material coating part with a larger volume, which is helpful in improving the energy density of the battery cell, or helpful in reducing the size of the battery cell without changing the energy density of the battery cell.

[0011] In some embodiments, the communication hole into which the conductive portion is inserted is a first communication hole, and at least the first communication hole is a liquid permeable hole.

[0012] In the above technical solution, if at least the first communicating hole is a liquid permeable hole, the first communicating hole also has a liquid permeable function, i.e., the first communicating hole can be used to pass the electrolyte after the conductive part is inserted. In this case, at least the first communicating hole can be used to pass the electrolyte, so that it is possible to choose whether to install additional communicating holes without the conductive part inserted as needed, which helps to reduce the total number of communicating holes, thereby simplifying the structure and processing of the electrode post body and improving the structural strength of the electrode post body.

[0013] In some embodiments, the communication hole into which the conductive portion is inserted is a first communication hole, and there are multiple communication holes, and the communication hole further includes at least one second communication hole into which no conductive portion is inserted, and at least the second communication hole is a liquid-permeable hole.

[0014] In the above technical proposal, when at least the second communication holes are liquid permeation holes, at least the second communication holes can be used to pass the electrolyte. In this case, the diameter or number of the first communication holes does not need to be relatively large to allow the electrolyte to pass through the first communication holes, and the dimensions of the conductive portion do not need to be relatively small to allow the electrolyte to pass through the first communication holes. Instead, the dimensions of the first communication holes can be designed to be slightly larger than the dimensions of the conductive portion so that they pass through the conductive portion. This can alleviate the problem of impurities falling into the accommodating cavity through the gap between the conductive portion and the first communication holes, alleviate the problem of localized weakness in the electrode post body due to the first communication hole being too large, and allow the conductive portion to be relatively large, which also helps improve current passing efficiency. Furthermore, when the electrolyte passes through the second communication holes, it is not affected by the conductive portion, thereby improving injection efficiency and reducing the risk of the electrolyte contaminating or corroding the conductive portion.

[0015] In some embodiments, the groove mouth of the first accommodating groove is located on the 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 the groove bottom wall, the conductive portion and the groove bottom wall are connected to form a first connecting portion, and the orthogonal projection of the liquid injection hole onto the groove bottom wall is positioned offset from the first connecting portion.

[0016] In the above technical solution, the electrolyte injected through the injection hole can avoid the first connection part between the conductive part and the pole body as much as possible, thereby reducing contamination and corrosion of the first connection part by the electrolyte.

[0017] In some embodiments, the through hole into which the conductive portion is inserted is a first through hole, the pole body is formed in an elongated structure, and the first through hole is formed in an elongated hole whose longitudinal direction extends in a direction from one end of the pole body to the other end of the length.

[0018] In the above technical solution, the space in the pole body can be fully utilized, and by increasing the length of the first communicating hole as much as possible, a larger conductive part can pass through the first communicating hole, which helps to increase the size of the conductive part and thereby improve current passage efficiency.If the first communicating hole is used as a liquid permeable hole, increasing the length of the first communicating hole also helps to improve liquid injection efficiency.

[0019] In some embodiments, the pole cover plate is an elongated cover plate, and the inlet hole is eccentrically disposed in the longitudinal direction of the pole cover plate.

[0020] In the above technical solution, the injection hole can be arranged to avoid the conductive part as much as possible, thereby reducing contamination and corrosion of the first connection part between the conductive part and the pole body by the injected electrolyte.

[0021] In some embodiments, the communication hole into which the conductive portion is inserted is a first communication hole, there are multiple first communication holes and multiple conductive portions, and at least one conductive portion is inserted into each first communication hole.

[0022] The above technical solution can improve the problem of the relatively large dimensions of a single first communicating hole weakening the local strength of the pole body, and if the first communicating hole is used as a liquid permeable hole, increasing the number of first communicating holes can also help improve the injection efficiency.

[0023] In some embodiments, the battery cell includes a battery core assembly including an active material coating portion housed in a housing cavity and a conductive portion connected to the active material coating portion, the conductive portion being connected to a wall surface of the pole body facing the housing cavity.

[0024] In the above technical proposal, by connecting the conductive part to the wall surface of the pole body facing the accommodating cavity, the conductive part does not penetrate the communicating hole and does not enter the first accommodating groove, thereby reducing contamination and corrosion of the first connection part between the conductive part and the pole body by the injected electrolyte.

[0025] In some embodiments, the communicating passage further includes a second accommodating groove located on the side of the first accommodating groove closest to the accommodating cavity, the second accommodating groove opening toward the accommodating cavity and communicating with the accommodating cavity, and the liquid-permeable hole penetrating the groove wall of the second accommodating groove to communicate between the first accommodating groove and the second accommodating groove.

[0026] In the above technical solution, the second accommodating groove can serve the function of temporarily storing electrolyte or gas. When filling the battery cell, the second accommodating groove can be used to temporarily store the electrolyte, thereby eliminating problems such as the electrolyte splashing out or spilling. Furthermore, when the battery cell is in operation, gas is generated after the electrolyte is involved in a reaction. The second accommodating groove can be used to temporarily store the electrolyte or the gas generated within the accommodating cavity, thereby eliminating the problems of electrolyte spilling or excessive air pressure within the accommodating cavity, and thereby improving the reliability of the battery cell.

[0027] In some embodiments, the liquid inlet hole is located opposite the liquid passage hole.

[0028] In the above technical solution, the electrolyte injected through the injection hole can flow directly toward the liquid permeation hole installed opposite the injection hole, thereby realizing faster and more efficient injection and improving injection efficiency.

[0029] In some embodiments, at least a portion of the pole post cover plate is fitted into the first receiving groove.

[0030] In the above technical solution, at least a portion of the pole cover plate is fitted into the first receiving groove, thereby reducing the space occupied by the pole cover plate other than the pole body, and improving the compactness of the structure.

[0031] In some embodiments, the edge of the pole post cover plate has an overlapping portion that overlaps the side of the pole post body away from the receiving cavity.

[0032] In the above technical solution, the electrode post cover plate and the electrode post body can be easily fitted and connected, the height of the cavity between the electrode post cover plate and the groove wall of the first receiving groove can be easily controlled, and the cavity volume can meet design needs. Furthermore, if the overlapping part is welded to the electrode post body and the electrode post body has a liquid permeable hole, the overlapping part can be separated from the liquid permeable hole, so that if the electrolyte passes through the liquid permeable hole and spills, the electrolyte can be separated from the welded part between the overlapping part and the electrode post body, thereby alleviating problems such as corrosion and contamination at the welded part.

[0033] In some embodiments, the edge of the pole cover plate has an overlapping portion, and the surface of the pole body away from the accommodating cavity has a notched groove surrounding the first accommodating groove, and at least a portion of the overlapping portion is fitted into the notched groove.

[0034] In the above technical solution, the notch groove is used to achieve positioning, which can improve the assembly efficiency of the pole body and the pole cover plate, and the notch groove is used to achieve a certain degree of position restriction, which can improve the stability and reliability of the fitting between the pole body and the pole cover plate. In addition, by providing the notch groove, the pole cover plate is further fitted into the pole body, and the pole cover plate protrudes less or not at all from the pole body, which helps to reduce the space it occupies other than the pole body.

[0035] In some embodiments, there is a fitting gap between the overlapping portion and the sidewall of the notched groove, and the dimension W of one end of the fitting gap away from the receiving cavity is less than 0.05 mm.

[0036] In the above technical solution, on the one hand, the overlapping portion of the pole cover plate can be smoothly assembled into the cutout groove of the pole body, and on the other hand, the fitting gap between the two is not too large, and when welding is used to connect the overlapping portion and the pole body, the welding yield between the overlapping portion and the pole body can be improved.

[0037] In some embodiments, the injection hole is located on the cathode pole cover plate, and the cathode pole cover plate and the cathode pole body are made of the same material.

[0038] In the above technical solution, when the injection hole is installed on the cathode pole cover plate, the electrolyte flows to the welded portion between the cathode pole cover plate and the cathode pole body. Since the welded portion is generally made of the same type of material, the welded portion is less susceptible to corrosion, which helps to improve the connection reliability between the pole cover plate and the pole body.

[0039] In some embodiments, the pole cover plate includes a first cover plate portion and a second cover plate portion, the first cover plate portion and the pole body are made of the same material, the first cover plate portion is connected to the pole body, and the second cover plate portion is connected to the first cover plate portion, and the liquid inlet is located on the first cover plate portion or the second cover plate portion.

[0040] In the above technical solution, the injection hole is installed on the electrode post cover plate made of a composite material. When the first cover plate portion and the electrode post body are made of the same material, the electrolyte flows to the welded portion between the first cover plate portion and the electrode post body. Because the welded portion is made of a combination of the same type of material, the welded portion is less likely to corrode, which helps to improve the connection reliability between the electrode post cover plate and the electrode post body.

[0041] In some embodiments, the flow area of ​​the inlet end of the inlet hole is greater than the flow area of ​​the outlet end of the inlet hole.

[0042] In the above technical solution, when the electrolyte is injected into the injection hole, it flows from the inlet end to the drain end. By making the flow area of ​​the inlet end of the injection hole larger than the flow area of ​​the drain end of the injection hole, it becomes easier to fit the injection hole and the injection nozzle, for example, to easily insert the injection nozzle into the inlet end of the injection hole, which helps reduce the chance of liquid leakage during the electrolyte injection process. Furthermore, because the flow area of ​​the inlet end of the injection hole is relatively large, it becomes easier to install a sealing structure to seal the injection hole.

[0043] In some embodiments, the inlet hole includes a first hole section and a second hole section, the first hole section is located upstream of the second hole section along the inlet flow direction, the flow area of ​​the first hole section gradually decreases or remains unchanged along the direction from the first hole section to the second hole section, the flow area of ​​the second hole section gradually decreases or remains unchanged along the direction from the first hole section to the second hole section, and the flow area of ​​the outlet end of the first hole section is equal to or greater than the flow area of ​​the inlet end of the second hole section.

[0044] In the above technical solution, the flow area of ​​the first hole section is relatively large, which makes it easy to fit the first hole section and the injection nozzle, and the first hole section can serve as a temporary storage area for the electrolyte, which helps to improve the injection efficiency and reduce the risk of the electrolyte splashing or spilling. It also makes it easy to assemble a sealing structure on the injection hole to ensure that the injection hole is securely sealed after injection.

[0045] In some embodiments, the injection hole is composed of a first hole section and a second hole section, the flow area of ​​the first hole section gradually decreases along the direction from the first hole section to the second hole section, and the flow area of ​​the outlet end of the first hole section is equal to the flow area of ​​the inlet end of the second hole section.

[0046] In the above technical solution, the injection hole is two-stage, and the first stage is approximately funnel-shaped. The side wall of the first stage can have a flow-guiding effect, so that the electrolyte that enters the first stage can quickly flow toward the second stage, thereby improving the injection efficiency. Furthermore, the flow area of ​​the outlet end of the first stage is equal to the flow area of ​​the inlet end of the second stage, so that no step is formed between the first stage and the second stage. Furthermore, due to the funnel shape of the first stage, liquid accumulation is unlikely to occur in the first stage.

[0047] In some embodiments, the inlet hole further includes a third hole section, which is located between the first hole section and the second hole section along the inlet flow direction, the flow area of ​​the third hole section gradually decreases along the direction from the first hole section to the second hole section, the flow area of ​​the inlet end of the third hole section is less than or equal to the flow area of ​​the outlet end of the first hole section, and the flow area of ​​the outlet end of the third hole section is equal to the flow area of ​​the inlet end of the second hole section.

[0048] In the above technical solution, when the electrolyte is injected into the injection hole, it first flows through the first hole section, then through the third hole section, and finally through the second hole section. The flow area of ​​the inlet end of the third hole section is less than or equal to the flow area of ​​the outlet end of the first hole section, which means that the flow area of ​​the first hole section is relatively large, which makes it easier to fit the first hole section into the injection nozzle. The first hole section can also serve as a temporary storage area for the electrolyte, which improves injection efficiency and reduces the risk of the electrolyte splashing or spilling. It also makes it easier to assemble a sealing structure on the injection hole to ensure that the injection hole is securely sealed after injection. The flow area of ​​the third hole stage gradually decreases from the first hole stage to the second hole stage, giving the third hole stage an approximately funnel-like shape. The side walls of the third hole stage can have a flow-guiding effect, allowing the electrolyte that enters the third hole stage to quickly flow toward the second hole stage, thereby improving the injection efficiency. Furthermore, the flow area of ​​the outlet end of the third hole stage is equal to the flow area of ​​the inlet end of the second hole stage, so no step is formed between the third hole stage and the second hole stage. Furthermore, due to the funnel shape of the third hole stage, liquid accumulation is unlikely to occur within the third hole stage.

[0049] In some embodiments, the battery cell further includes a seal structure that fits into the pole cover plate and seals the fill hole.

[0050] In the above technical solution, the installation of a sealing structure ensures the sealing of the filling hole, prevents electrolyte from spilling, and prevents external foreign objects from entering the receiving cavity through the filling hole, thereby improving the reliability of the battery cell.

[0051] In some embodiments, the seal structure includes a first seal member at least partially fitted into the inlet hole and tightly fitted into the inlet hole to seal the inlet hole.

[0052] In the above technical solution, the first sealing member is fixed by an interference fit method, which helps to quickly install the first sealing member and improves the sealing reliability of the first sealing member against the inlet hole.

[0053] In some embodiments, the sealing structure includes a second sealing member that covers the inlet end of the inlet hole and is sealingly connected to the pole cover plate.

[0054] In the above technical proposal, sealing can be performed from the source of the liquid inlet, thereby reducing the probability of contamination of the liquid inlet by foreign matter, and by covering the liquid supply end of the liquid inlet with the second sealing member, it becomes easier to quickly assemble the second sealing member, improving the assembly efficiency of the second sealing member.

[0055] In some embodiments, the inlet includes a first hole section and a second hole section arranged in sequence along the inlet 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 portion of the second sealing member is fitted into the first hole section and covers the second hole section.

[0056] In the above technical solution, the portion of the second seal member that fits into the first hole section can cover the second hole section, thereby ensuring a reliable seal for the liquid filling hole. Furthermore, because the first hole section has a relatively large diameter, fitting at least the second seal member into the first hole section facilitates assembly and positioning of the second seal member, eliminating the need for positioning clamps and facilitating connection between the second seal member and the pole cover plate. Furthermore, the space occupied by the second seal member outside the pole cover plate can be reduced, thereby helping to reduce the overall dimensions of the battery cell.

[0057] In some embodiments, an edge of the second seal member is sealingly connected to the hole wall of the first hole step.

[0058] In the above technical solution, by connecting the edge of the second sealing member to the hole wall of the first hole section, the second sealing member can be completely accommodated inside the first hole section in the radial direction of the first hole section, which further reduces the space occupied by the second sealing member other than the electrode post cover plate and helps to improve the compactness of the fitting between the second sealing member and the electrode post cover plate. In addition, by using the hole wall of the first hole section to restrict the position of the edge of the second sealing member, the connection stability and reliability between the second sealing member and the electrode post cover plate can be improved.

[0059] In some embodiments, the second seal member includes an extension portion that extends to the exterior of the first hole section and is superimposed on and sealingly connected to a wall surface of the pole post cover plate on a side away from the receiving cavity.

[0060] The above technical solution serves to increase the connection area between the second seal and the electrode post cover plate, thereby improving the connection reliability between the second seal and the electrode post cover plate. Furthermore, the requirements for the shape of the first hole section are relatively low, and it is not necessary to configure the edge of the second seal and the hole wall of the first hole section to have a clearance fit that meets the shapes and meets the requirements. This reduces the processing precision of the electrode post cover plate and the second seal, improves production efficiency, and reduces production costs.

[0061] In some embodiments, the inlet hole forms a stepped surface at the connection point between the first hole section and the second hole section, and the portion of the second sealing member fitted into the first hole section is supported by the stepped surface.

[0062] In the above technical solution, the portion of the second sealing member inserted into the first hole section is supported by a step surface, thereby improving the connection stability between the second sealing member and the pole cover plate.

[0063] In some embodiments, the seal arrangement includes a first seal member that is sealingly fitted with an interference fit to the second bore step and is located on a side of the second seal member that is adjacent to the receiving cavity.

[0064] In the above technical solution, the sealing structure includes a first sealing member and a second sealing member, and the second sealing member serves to prevent the first sealing member from coming off the inlet, improving the reliability of the sealing fit between the first sealing member and the second sealing member, and further improving the sealing reliability of the entire sealing structure for the inlet. Furthermore, the first sealing member is fixed by an interference fit, which facilitates quick installation of the first sealing member.

[0065] In some embodiments, the second seal member includes a recessed portion that protrudes away from the first seal member, a recessed cavity formed on the side of the recessed portion facing the first seal member, and a portion of the first seal member extends into the recessed cavity.

[0066] In the above technical solution, the compactness of the fitting between the first seal and the second seal can be improved, reducing space occupation and waste and the volume of the battery cell. Furthermore, by making the second seal uneven, the structural strength of the second seal can be improved, and the reliability and stability of the fitting between the second seal and the pole cover plate can be improved.

[0067] In some embodiments, the second sealing member includes a central portion and an edge portion surrounding the central portion, the central portion being fitted into the liquid inlet hole, and the edge portion being overlapped and sealed against the portion surrounding the liquid inlet hole on the wall surface of the pole cover plate away from the accommodating cavity.

[0068] In the above technical solution, the requirements for the shape of the filling hole are relatively low, and there is no need to increase the thickness of the electrode post cover plate to process the filling hole into a complex shape, so the electrode post cover plate can be made thinner, the positioning and fitting between the second seal and the electrode post cover plate is stable, which helps to improve the stability and reliability of the connection between the second seal and the electrode post cover plate, and the compactness of the fitting between the second seal and the electrode post cover plate helps to save space, and the method of connecting the second seal to the electrode post cover plate by overlapping it helps to quickly connect the two.

[0069] In some embodiments, the casing includes a first casing wall, the pole body is provided in the first casing wall, and the first casing wall is an integrally molded cover plate, or the first casing wall and at least one second casing wall are integrally molded, and the second casing wall extends toward one side in the thickness direction of the first casing wall.

[0070] The above technical solution allows for flexible design of pole positions, thereby expanding the application range of the battery cell.

[0071] In a second aspect, an embodiment of the present application further provides a battery including a bus member and any one of the battery cells described above, wherein the battery cells are multiple, and at least two of the battery cells are electrically connected by the bus member.

[0072] In the above technical solution, the performance and manufacturability of the battery cell according to the embodiment of the present application are both improved, which helps to improve the performance and manufacturability of the battery.

[0073] In some embodiments, the bus member and the surface of the pole cover plate away from the receiving cavity are connected to form a second connecting portion, and the liquid inlet is positioned offset from the second connecting portion.

[0074] In the above technical solution, if the electrolyte spills from the injection hole, it is possible to reduce the contamination and corrosion of the second connection part by the electrolyte, and it is also possible to avoid the influence on the connection between the bus member and the electrode post cover plate caused by the sealing structure of the seal cap on the injection hole, thereby improving the convenience and reliability of the connection between the bus member and the electrode post cover plate.

[0075] In some embodiments, the surface of the pole cover plate facing away from the receiving cavity is formed with a boundary portion located between the second connection portion and the liquid inlet.

[0076] In the above technical solution, the boundary has a recessed or protruding structure, and when electrolyte spills from the filling hole, it can be blocked by the boundary to reduce the probability of the electrolyte contacting the second connection part, thereby reducing the contamination and corrosion of the second connection part by the electrolyte. Furthermore, the provision of the boundary can serve as a marker to keep the connection position between the bus member and the pole cover plate away from the filling hole, thereby further reducing the possibility of electrolyte spilling from the filling hole contacting the second connection part.

[0077] In a third aspect, embodiments of the present application further provide a power consuming device including a battery of any one of the above forms.

[0078] In the above technical solution, the performance of the battery is improved, which helps to improve the electrical performance of the power consuming device during operation. [Brief explanation of the drawings]

[0079] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings used in the embodiments. However, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without any creative work.

[0080] [Figure 1]1 is a structural schematic diagram of a vehicle provided in accordance with some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery structure provided in accordance with some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a battery cell provided by some embodiments of the present application; [Figure 4] 1 is an orthographic schematic diagram of a battery cell provided in accordance with some embodiments of the present application. FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line MM in FIG. 4. [Figure 6] FIG. 6 is a locally enlarged view of FIG. 5. [Figure 7] 1 is a schematic diagram of the mating of a pole body and a conductive portion provided by some embodiments of the present application. [Figure 8] 1 is a schematic diagram of the mating of a pole body and a conductive portion provided by some embodiments of the present application. [Figure 9] 1 is a cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 10] 1 is a cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 11] FIG. 11 is a locally enlarged view of the circled area F1 in FIG. 10. [Figure 12] 1 is a cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 13] 1 is a top cross-sectional view of a pole post cover plate provided in accordance with some embodiments of the present application. [Figure 14] 10A and 10B are cross-sectional views of the mating of a pole post cover plate and a seal structure provided by some embodiments of the present application. [Figure 15] 1 is a top cross-sectional view of a pole post cover plate provided in accordance with some embodiments of the present application. [Figure 16] 1 is a top cross-sectional view of a pole post cover plate provided in accordance with some embodiments of the present application. [Figure 17] 1 is a top cross-sectional view of a pole post cover plate provided in accordance with some embodiments of the present application. [Figure 18]1 is a schematic diagram of the mating of a terminal post and a seal structure provided by some embodiments of the present application. [Figure 19] 10A and 10B are cross-sectional views of the mating of a pole post cover plate and a seal structure provided by some embodiments of the present application. [Figure 20] 10A and 10B are cross-sectional views of the mating of a pole post cover plate and a seal structure provided by some embodiments of the present application. [Figure 21] 1 is a cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 22] 1 is a schematic diagram of a mating between a battery cell and a bus member provided in accordance with some embodiments of the present application.

[0081] Symbols in the drawings: vehicle 1000, first direction X, second direction Y, third direction Z, battery 100, controller 200, motor 300, case 101, first case body 1011, second case body 1012, battery cell 102, pole 1020, casing 1, accommodating cavity 1A, first casing wall 11, second casing wall 12, pole body 2, communicating passage 2A, first accommodating groove 211, groove bottom wall 2110, second accommodating groove 212, communicating hole 22, first communicating hole 221, second communicating hole 222, liquid permeable hole 23, notched groove 25, fitting gap 26, outer stopper portion 271, inner stopper Par portion 272, seal structure 1022, pole cover plate 3, liquid filling hole 31, liquid supply end 31a, liquid drain end 31b, first hole step 311, second hole step 312, third hole step 313, step surface 314, overlapping portion 32, first cover plate portion 331, second cover plate portion 332, boundary portion 34, first sealing member 4, second sealing member 5, extension portion 51, central portion 52, edge portion 53, relief portion 54, relief cavity 55, seal pad 1023, insulating pad 1024, battery core assembly 7, active material application portion 71, conductive portion 72, first connecting portion 73, bus member 103, second connecting portion 104. DETAILED DESCRIPTION OF THE INVENTION

[0082] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without performing creative work fall within the scope of protection of the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the application, and the terms "comprise" and "have" and any variations thereof in the specification, claims, and drawings of this application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects and are not used to describe a particular order or priority.

[0084] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various locations in the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments of other embodiments.

[0085] In the description of this application, unless otherwise clearly specified or limited, the terms "mounted," "coupled," "connected," and "attached" should be understood in a broad sense, for example, to mean a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art may understand the specific meanings of the above terms in this application according to specific circumstances.

[0086] The term "and / or" in this application is simply a relational relationship that describes related objects, and indicates that three types of relationships can exist. For example, A and / or B can represent three situations: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0087] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various components in the embodiments of the present application shown in the accompanying drawings, and the overall thickness, length, width, etc. of the integrated device, are merely exemplary and should not be construed as limitations of the present application.

[0088] The term "plurality" as used herein refers to two or more (including two).

[0089] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0090] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module typically includes multiple battery cells. A battery pack typically includes a case for enclosing one or more battery cells or one or more battery modules. The case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0091] The battery cell includes a casing for housing the battery core assembly and the electrolyte, the battery core assembly, and the electrolyte. The battery core assembly includes at least one electrode assembly consisting of a positive electrode piece, a negative electrode piece, and a separator film, and the electrode assembly may have a wound structure, a laminated structure, or the like. The battery cell functions primarily by relying on the movement of metal ions between the positive and negative electrode pieces.

[0092] The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer 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 is called a positive electrode tab. For example, in a lithium-ion battery, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.

[0093] The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer directly or indirectly applied to the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding 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 is called 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.

[0094] To ensure that they do not melt even when a large current flows, multiple positive electrode tabs are stacked to form the positive electrode tab portion, and multiple negative electrode tabs are stacked to form the negative electrode tab portion. Electrode posts are provided on the casing, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be welded to the electrode post to form a direct electrical connection between the tab portion and the electrode post. Also, for example, the battery core assembly may include an adapter sheet, and the tab portion can be welded to the adapter sheet, and the adapter sheet can be welded to the electrode post to form an indirect electrical connection between the tab portion and the electrode post.

[0095] The material of the separator film is not particularly limited, and may be, for example, polypropylene or polyethylene.

[0096] In battery cells in the related art, the top cover of a casing is typically equipped with a pole and an explosion-proof valve, and the top cover also has a liquid filling hole spaced apart from the pole and explosion-proof valve. Because the liquid filling hole is installed separately on the top cover, it occupies a large area of ​​the top cover, thereby making the area of ​​the pole relatively small. Increasing the area of ​​the pole requires increasing the dimensions of the top cover, which increases the weight of the larger top cover, making it difficult to reduce the size and weight of the top cover. Furthermore, because the liquid filling hole must be machined separately on the top cover, the structure of the top cover becomes relatively complex, making processing the liquid filling hole relatively difficult.

[0003] Furthermore, from the viewpoint of sealing performance, a sealing pin needs to be welded to the top cover to seal the injection hole. However, as the energy density of battery cells increases, the top cover becomes thinner, which is prone to problems such as poor depression or weld penetration at the sealing pin welding point on the top cover. To solve this problem, the top cover typically requires thickening of the area where the sealing pin is welded, which increases the material and manufacturing costs of the top cover, or requires thickening of the entire top cover, which fails to meet the requirements for a lightweight and thin top cover and affects the energy density of the battery cell. Furthermore, to ensure insulation at the sealing pin and prevent interference between the sealing pin and the battery core assembly inside the casing, the lower plastic structure below the top cover needs to be thickened. This thickened lower plastic structure not only increases material costs but also occupies more space in the housing cavity, which affects the energy density of the battery cell.

[0097] For this reason, an embodiment of the present application presents a battery cell, which includes a casing defining a receiving cavity, a post body formed in the casing and having a communication passage communicating with the receiving cavity, and a post cover plate covering the post body and having a filling hole communicating with the communication passage. The filling hole is provided in the post cover plate and is fitted to the post body having the communication passage, thereby enabling electrolyte to be injected through the post made up of the post body and the post cover plate. Because there is no need to provide a separate filling hole in the battery cell casing, the filling hole does not occupy space in the casing, and there is no need to reduce the size of the post to accommodate the filling hole. This allows the area and flow area of ​​the post to be increased without increasing the size of the casing, reducing flow resistance and improving the current flow efficiency of the battery cell. The increased area of ​​the post also facilitates assembly and connection of the post to the casing. Furthermore, since there is no need to increase the dimensions of the casing in order to increase the area of ​​the pole, it helps to realize a smaller and lighter casing.

[0098] Furthermore, there is no need to perform special processing on the casing to provide a separate injection hole, which helps reduce the complexity of the casing structure and the difficulty of processing. Furthermore, there is no need to increase the thickness of the casing in parts to weld a seal pin to the casing, which further simplifies the casing structure and processing, and there is no need to increase the thickness of the entire casing to weld a seal pin to the casing. This helps meet the requirements for a lighter and thinner casing, improves the energy density of the battery cell, and reduces the weight and material costs of the casing.

[0099] Furthermore, in the battery cell according to the embodiment of the present application, the liquid filling hole is located on the pole cover plate, which makes it easier to manufacture and process the liquid filling hole. As a result, the dimensions, shape, etc. of the liquid filling hole can more easily meet design requirements and application needs, which reduces the difficulty and cost of processing the liquid filling hole.

[0100] Furthermore, by locating the liquid filling hole in the electrode post cover plate, the electrode post cover plate also has a electrode post body on the side closest to the accommodating cavity. Therefore, even if a sealing pin is installed in the liquid filling hole, the electrode post body is still interposed between the lower plastic structure and the sealing pin. This eliminates the need for thickening of the lower plastic structure to ensure insulation at the sealing pin, and also eliminates the need to thicken the lower plastic structure to avoid the relatively long interference between the sealing pin and the battery core assembly. This therefore helps to make the lower plastic structure thinner and reduce material costs, and also helps to improve the energy density of the battery cell by reducing the space within the accommodating cavity occupied by the lower plastic structure.

[0101] In addition, the battery cell according to the embodiment of the present application has an injection hole in the pole cover plate and a communication passage in the pole body, which extends the injection path to a certain extent and provides a certain degree of injection buffering effect, which helps to reduce the possibility of electrolyte splashing or spilling when the battery cell is being injected or operated.

[0102] An embodiment of the present application provides a power-consuming device that uses a battery as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric scooter, an electric vehicle, a boat, a spacecraft, etc. Among them, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric toy car, an electric toy boat, an electric toy airplane, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0103] In the following embodiment, for convenience of explanation, a case will be described in which the power consuming device according to an embodiment of the present invention is a vehicle 1000.

[0104] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, for example, the battery 100 can function as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs of the vehicle 1000 during starting, navigation, and driving.

[0105] In some embodiments of the present application, the battery 100 is not only used as the operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000, replacing or partially replacing fuel or natural gas as the driving power source for the vehicle 1000.

[0106] Referring to FIG. 2, FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 101 and a plurality of battery cells 102, which are housed in the case 101. The case 101 provides an assembly space for the battery cells 102, and the case 101 may have various structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, which are covered by each other and which jointly define an assembly space for housing the battery cells 102. The second case body 1012 may have a hollow structure with one end open, and the first case body 1011 may have a plate-like structure, and the first case body 1011 is covered by the open side of the second case body 1012 so that the first case body 1011 and the second case body 1012 jointly define an assembly space, and both the first case body 1011 and the second case body 1012 may have a hollow structure with one end open, and the open side of the first case body 1011 is covered by the open side of the second case body 1012. Of course, the shape of the case 101 formed by the first case body 1011 and the second case body 1012 may be various shapes such as a cylinder or a rectangular parallelepiped.

[0107] In the battery 100, the battery cells 102 can be connected in series, parallel, or series-parallel, where series-parallel connection refers to the battery cells 102 being connected in both series and parallel. The battery cells 102 can be connected in direct series, parallel, or series-parallel, and the battery cells 102 can be housed as a whole in the case 101. Of course, the battery 100 can also be formed by first connecting the battery cells 102 in series, parallel, or series-parallel to form a battery module, and then connecting the battery modules in series, parallel, or series-parallel to form a whole and housed in the case 101. The battery 100 may further include other structures, for example, the battery 100 may further include bus members for realizing electrical connection between the battery cells 102.

[0108] Each battery cell 102 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 102 may be cylindrical, flat, rectangular, etc. For example, referring to the embodiment shown in FIG. 3 , the length direction of the battery cell 102 is a first direction X, the width direction of the battery cell 102 is a second direction Y, and the height direction of the battery cell 102 is a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0109] According to some embodiments of the present application, in combination with Figures 4 to 6, the battery cell 102 includes a casing 1 that defines a storage cavity 1A, a pole body 2 that is provided in the casing 1 and has a communication passage 2A that communicates with the storage cavity 1A, and a pole cover plate 3 that is provided to cover the pole body 2 and has a liquid injection hole 31 that communicates with the communication passage 2A.

[0110] Since the electrode post cover plate 3 is attached to the electrode post body 2, the inlet hole 31 is located upstream of the communicating passage 2A in the injection flow direction. That is, when electrolyte is injected into the battery cell 102, the electrolyte first flows through the inlet hole 31 and then through the communicating passage 2A. As a result, when electrolyte needs to be injected into the accommodating cavity 1A of the battery cell 102, the electrolyte can be injected through the inlet hole 31. Because the inlet hole 31 is connected to the communicating passage 2A, the electrolyte that enters the inlet hole 31 can flow into the communicating passage 2A. Because the communicating passage 2A is connected to the accommodating cavity 1A, the electrolyte that enters the communicating passage 2A can flow into the accommodating cavity 1A. This allows electrolyte to be injected into the accommodating cavity 1A via the inlet hole 31 and the communicating passage 2A.

[0111] It should be noted that the installation position of the pole body 2 in the casing 1 is not limited. For example, the casing 1 may include a first casing wall 11, and the pole body 2 may be disposed in the first casing wall 11. For example, when the battery cell 102 needs to be filled, the battery cell 102 may be installed such that the first casing wall 11 is located at the top of the casing 1. In this case, the pole body 2 is located at the top of the casing 1, the pole cover plate 3 is attached to the upper end of the pole body 2, and the filling hole 31 is located above the communicating passage 2A. When the electrolyte is poured into the filling hole 31, the electrolyte passes downward through the filling hole 31 and enters the communicating passage 2A, and then flows downward from the communicating passage 2A into the receiving cavity 1A, thereby improving the convenience of filling and reducing the likelihood of the electrolyte spilling or splashing out. When the battery cell 102 is in operation, the liquid filling hole 31 can be sealed, and at this time, the casing 1 can be installed so that the first casing 1 is located at any position of the casing 1; for example, when the battery cell 102 is in operation, the first casing wall 11 can be located at any of the top, bottom, side, etc. of the casing 1.

[0112] The battery cell 102 according to the present embodiment has a liquid filling hole 31 provided on the electrode post cover plate 3 and fitted into the electrode post body 2 having a communication passage 2A, thereby enabling electrolyte to be filled through the electrode post 1020 composed of the electrode post body 2 and the electrode post cover plate 3. Because there is no need to provide a separate liquid filling hole 31 on the casing 1 of the battery cell 102, the liquid filling hole 31 does not occupy space in the casing 1, and there is no need to reduce the dimensions of the electrode post 1020 to accommodate the liquid filling hole 31. This allows the area and flow area of ​​the electrode post 1020 to be increased without increasing the dimensions of the casing 1, reducing flow resistance and improving the current passage efficiency of the battery cell 102. The increased area of ​​the electrode post 1020 also facilitates assembly and connection between the electrode post 1020 and the casing 1. Furthermore, there is no need to increase the dimensions of the casing 1 to increase the area of ​​the electrode post 1020, which contributes to making the casing 1 more compact and lightweight.

[0113] Furthermore, there is no need to perform special processing on the casing 1 in order to provide the liquid injection hole 31 separately in the casing 1, which helps to reduce the complexity of the structure and the difficulty of processing the casing 1. Furthermore, there is no need to increase the thickness of parts of the casing 1 in order to weld a seal pin to the casing 1, which further simplifies the structure and processing of the casing 1, and there is no need to increase the thickness of the entire casing 1 in order to weld a seal pin to the casing 1, which helps to meet the requirements for a lighter and thinner casing 1, helps to improve the energy density of the battery cell 102, and also helps to reduce the weight and material costs of the casing 1.

[0114] Furthermore, in the battery cell 102 according to the embodiment of the present application, the liquid filling hole 31 is provided on the pole cover plate 3, which makes it easier to manufacture and process the liquid filling hole 31. As a result, the dimensions, shape, etc. of the liquid filling hole 31 can relatively easily meet design requirements and application needs, which reduces the difficulty and cost of processing the liquid filling hole 31.

[0115] Furthermore, by locating the liquid injection hole 31 in the electrode post cover plate 3, the electrode post cover plate 3 also has a electrode post body 2 on the side closest to the receiving cavity 1A. Therefore, even if a sealing pin is installed in the liquid injection hole 31, the electrode post body 2 is further interposed between the lower plastic structure and the sealing pin. Therefore, there is no need to thicken the lower plastic structure to ensure insulation at the sealing pin, and there is no need to thicken the lower plastic structure to avoid the relatively long interference between the sealing pin and the battery core assembly 7. This helps to make the lower plastic structure thinner and reduce material costs. Furthermore, by reducing the space within the receiving cavity 1A occupied by the lower plastic structure, it helps to improve the energy density of the battery cell 102.

[0116] In addition, the battery cell 102 according to the embodiment of the present application has an inlet 31 in the pole cover plate 3 and a communication passage 2A in the pole body 2, which extends the inlet path to a certain extent and provides a certain degree of buffering effect during inlet injection, thereby helping to reduce the possibility of electrolyte splashing or spilling when the battery cell 102 is injecting or operating.

[0117] In some embodiments, as shown in FIG. 6, the communication passage 2A includes a first accommodating groove 211 that opens toward the pole cover plate 3 to communicate with the liquid inlet 31, and a liquid permeable hole 23 that penetrates the groove wall of the first accommodating groove 211 and communicates between the first accommodating groove 211 and the accommodating cavity 1A.

[0118] Illustratively, the communication passage 2A includes a first accommodating groove 211 that opens toward the electrode post cover plate 3 to communicate with the liquid inlet 31 (i.e., the first accommodating groove 211 opens on the side away from the accommodating cavity 1A), and a liquid permeation hole 23 that penetrates the groove wall of the first accommodating groove 211 on the side away from the electrode post cover plate 3 to communicate between the first accommodating groove 211 and the accommodating cavity 1A (i.e., the liquid permeation hole 23 is located on the side of the first accommodating groove 211 that is close to the accommodating cavity 1A and penetrates the groove wall of the first accommodating groove 211 on the side close to the accommodating cavity 1A). Alternatively, the liquid permeation hole 23 can also penetrate the groove wall at another position of the first accommodating groove 211, as long as it can communicate between the first accommodating groove 211 and the accommodating cavity 1A.

[0119] When it is necessary to inject electrolyte into the accommodating cavity 1A of the battery cell 102, the electrolyte can be injected into the liquid inlet 31. Since the liquid inlet 31 is connected to the first accommodating groove 211, the electrolyte that enters the liquid inlet 31 can flow into the first accommodating groove 211. Furthermore, since the first accommodating groove 211 is connected to the accommodating cavity 1A through the liquid permeation hole 23, the electrolyte that enters the first accommodating groove 211 can flow into the accommodating cavity 1A through the liquid permeation hole 23. This enables the electrolyte to be injected into the accommodating cavity 1A through the liquid inlet 31, the first accommodating groove 211, and the liquid permeation hole 23.

[0120] As a result, the communication passage 2A includes a first accommodating groove 211 formed in the pole body 2, and the first accommodating groove 211 can temporarily store the electrolyte, thereby alleviating problems such as the electrolyte spilling or spilling during the injection or operation of the battery cell 102. Furthermore, since the first accommodating groove 211 can temporarily store the electrolyte during injection, it helps to improve the efficiency of the injection of the electrolyte, and the groove side wall of the first accommodating groove 211 (i.e., the groove wall extending from the open side of the first accommodating groove 211 toward the accommodating cavity 1A) can block the electrolyte from spilling to a certain extent, thereby reducing external contamination by the electrolyte.

[0121] It should also be noted that when the communicating passage 2A includes the first accommodating groove 211, the liquid permeable hole 23 can be installed on the side of the first accommodating groove 211 that is close to the accommodating cavity 1A, and can penetrate the groove wall of the first accommodating groove 211 that is close to the accommodating cavity 1A. In this case, the first accommodating groove 211 corresponds to a sink structure, so that the liquid permeable hole 23 is away from the groove mouth of the first accommodating groove 211 and is relatively far from the connection point between the electrode post cover plate 3 and the electrode post main body 2. When the electrolyte spills out of the liquid permeable hole 23, the spilled electrolyte is less likely to come into contact (for example, by welding or bonding) with the connection position between the electrode post cover plate 3 and the electrode post main body 2, thereby reducing corrosion and contamination of the connection position.

[0122] In some embodiments of the present application, the cross-sectional shape of the first accommodating groove 211 is the same as that of the pole body 2. This allows the space of the pole body 2 to be fully utilized, and the dimensions of the first accommodating groove 211 to be as large as possible, which is helpful in improving the functions of the first accommodating groove 211 for temporary storage, accommodation, etc.

[0123] 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 may only have the liquid permeable hole 23, and the liquid inlet hole 31 may face and communicate with the liquid permeable hole 23, thereby meeting the liquid inlet needs.

[0124] In some embodiments, the battery cell 102 further includes a battery core assembly 7 including an active material coated portion 71 accommodated in the accommodation cavity 1A and a conductive portion 72 connected to the active material coated portion 71. Illustratively, the conductive portion 72 may be connected to the electrode post 1020 to form an electrical connection, thereby realizing electrode output of the battery core assembly 7 from the electrode post 1020. For example, the conductive portion 72 may be connected to the electrode post 1020 by welding or the like. As will be understood, the active material coated portion 71 may include a current collector on which an active material layer is coated, and the conductive portion 72 may include only a tab portion, or may include a tab portion and an adapter sheet electrically connected to the tab portion, and the present invention is not limited thereto.

[0125] The electrode post body 2 is formed with a communication hole 22 communicating between the first accommodating groove 211 and the accommodating cavity 1A, and the number of the communication hole 22 may be one or more, and at least one of the communication holes 22 is a liquid permeable hole 23. The conductive part 72 is inserted into at least one of the communication holes 22 so that at least a portion of the conductive part 72 is accommodated in the first accommodating groove 211. For example, the electrode post body 2 is formed with the first accommodating groove 211 and the communication hole 22, the first accommodating groove 211 opens in a direction away from the accommodating cavity 1A so as to communicate with the liquid inlet 31, the communication hole 22 is located on the side of the first accommodating groove 211 that is close to the accommodating cavity 1A, and the communication hole 22 penetrates the groove wall of the first accommodating groove 211 on the side that is close to the accommodating cavity 1A so as to communicate between the first accommodating groove 211 and the accommodating cavity 1A, and at least one of the communication holes 22 is inserted into the at least one communication hole 22. The through holes 22 are liquid permeable holes 23, and the conductive portion 72 can penetrate through the communicating holes 22 that are liquid permeable holes 23 (i.e., the communicating holes 22 through which the conductive portion 72 penetrates can still be used to flow the electrolyte after penetrating the conductive portion 72), or can penetrate through communicating holes 22 that are not liquid permeable holes 23 (i.e., the communicating holes 22 through which the conductive portion 72 penetrates must be able to be used to flow the electrolyte after penetrating the conductive portion 72).

[0126] As a result, by accommodating at least a portion of the conductive portion 72 in the first accommodating groove 211, at least a portion of the conductive portion 72 occupies space in the first accommodating groove 211, thereby reducing the space in the accommodating cavity 1A occupied by the conductive portion 72 and saving space in the accommodating cavity 1A to accommodate the active material coating portion 71 with a larger volume, which helps to improve the energy density of the battery cell 102 or helps to reduce the dimensions of the battery cell 102 without changing the energy density of the battery cell 102.

[0127] 7 , the communication hole 22 having the conductive portion 72 inserted therein can be defined as the first communication hole 221 (i.e., the conductive portion 72 is inserted in at least one communication hole 22, and the communication hole 22 having the conductive portion 72 inserted therein can be defined as the first communication hole 221), and at least the first communication hole 221 can be defined as the liquid permeable hole 23. In this way, when the electrode post main body 2 has the first communication hole 221 through which the conductive portion 72 passes, the first communication hole 221 having the conductive portion 72 inserted therein also has a liquid permeable function, regardless of whether the electrode post main body 2 has second communication holes 222 (described later) in which the conductive portion 72 is not inserted therein. In other words, even after the first communication hole 221 is inserted in the conductive portion 72, the first communication hole 221 has a liquid permeable gap. During injection, the electrolyte can be injected through the injection hole 31 into the first accommodating groove 211, and then at least a portion of the electrolyte can flow into the accommodating cavity 1A through the first communicating hole 221 into which the conductive portion 72 is inserted.

[0128] In some embodiments, in combination with Figure 8, the communication hole 22 into which the conductive portion 72 is inserted is referred to as the first communication hole 221, and there are multiple communication holes 22, and the communication holes 22 further include at least one second communication hole 222 into which the conductive portion 72 is not inserted (i.e., at least one communication hole 22 is not inserted into the conductive portion 72, and the communication hole 22 into which the conductive portion 72 is not inserted is referred to as the second communication hole 222), and at least the second communication hole 222 can be referred to as the liquid permeable hole 23.

[0129] For example, if the first communication hole 221 also has a liquid permeability function (i.e., the first communication hole 221 has a liquid permeability gap even after penetrating the conductive portion 72), and both the first communication hole 221 and the second communication hole 222 are liquid permeability holes 23, during injection, the electrolyte passes through the injection hole 31 and is injected into the first accommodating groove 211, and then some of it can flow into the accommodating cavity 1A through the first communication hole 221 into which the conductive portion 72 is inserted, and some of it can flow into the accommodating cavity 1A through the second communication hole 222 into which the conductive portion 72 is not inserted.

[0130] Furthermore, for example, if the first communication hole 221 does not have a liquid permeability function (i.e., after the first communication hole 221 penetrates the conductive portion 72, it is sealed and cannot pass liquid through), and only the second communication hole 222 is used as the liquid permeability hole 23, during injection, the electrolyte passes through the injection hole 31 and is injected into the first accommodating groove 211, and then flows into the accommodating cavity 1A only through the second communication hole 222 into which the conductive portion 72 is not inserted.

[0131] In the embodiments of the present application, when at least the first communication hole 221 is a liquid permeable hole 23, the first communication hole 221 also has a liquid permeable function, that is, the first communication hole 221 can be used to pass the electrolyte after the conductive part 72 is inserted. In this case, at least the first communication hole 221 can be used to pass the electrolyte, so that, as needed, it is possible to choose whether to install additional communication holes 22 (e.g., second communication holes 222) without the conductive part 72 inserted therein, which further helps to reduce the total number of communication holes 22, thereby simplifying the structure and processing of the electrode post body 2 and improving the structural strength of the electrode post body 2.

[0132] In the embodiments of the present application, when at least the second communication hole 222 is a liquid permeation hole 23, at least the second communication hole 222 can be used to pass the electrolyte. In this case, there is no need to set the diameter or number of the first communication hole 221 relatively large to allow the electrolyte to pass through the first communication hole 221, and there is no need to set the dimensions of the conductive portion 72 relatively small to allow the electrolyte to pass through the first communication hole 221. It is sufficient to design the dimensions of the first communication hole 221 to be slightly larger than the dimensions of the conductive portion 72 so that it penetrates the conductive portion 72. This can solve the problem of impurities and the like falling into the accommodating cavity 1A through the gap between the conductive portion 72 and the first communication hole 221, and can also solve the problem of the local strength of the pole body 2 becoming weak due to the dimensions of the first communication hole 221 being too large. It can also make the dimensions of the conductive portion 72 relatively larger, which is also useful for improving the current passage efficiency. Furthermore, when the electrolyte passes through the second communication hole 222, it is not affected by the conductive portion 72, thereby improving the injection efficiency and reducing the risk of problems such as the electrolyte contaminating and corroding the conductive portion 72.

[0133] For example, in Example 1 of the present application, there is at least one communication hole 22, and a conductive part 72 is inserted into each of the communication holes 22, so that each communication hole 22 is a first communication hole 221. In this case, at least one of the first communication holes 221 forms a liquid permeable hole 23, and the electrolyte passes through the injection hole 31 and is injected into the first accommodating groove 211, and then flows into the accommodating cavity 1A from the first communication hole 221 into which the conductive part 72 is inserted.

[0134] For example, in Example 2 of the present application, there are at least two communication holes 22, at least one of which is a first communication hole 221 into which a conductive portion 72 is inserted, and at least one of which is a second communication hole 222 into which no conductive portion 72 is inserted. In this case, both the first communication hole 221 and the second communication hole 222 form a liquid permeable hole 23, and the electrolyte passes through the injection hole 31 and is injected into the first accommodating groove 211. After that, a portion of the electrolyte flows into the accommodating cavity 1A from the first communication hole 221 into which the conductive portion 72 is inserted, and the remaining portion flows into the accommodating cavity 1A from the second communication hole 222 into which no conductive portion 72 is inserted.

[0135] For example, in Example 3 of the present application, there are at least two communication holes 22, at least one of which is a first communication hole 221 into which a conductive portion 72 is inserted, and at least one of which is a second communication hole 222 into which no conductive portion 72 is inserted, and the first communication hole 221 is sealed after penetrating the conductive portion 72 so that liquid cannot pass through. At this time, only the second communication hole 222 constitutes the liquid permeation hole 23, and the electrolyte passes through the liquid injection hole 31 and is injected into the first accommodating groove 211, and then flows into the accommodating cavity 1A from the second communication hole 222 into which no conductive portion 72 is inserted.

[0136] In some embodiments, the first receiving groove 211 opens in a direction away from the receiving cavity 1A, the groove opening 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 of the first receiving groove 211 on the side close to the receiving cavity 1A is a groove bottom wall 2110, the conductive part 72 and the groove bottom wall 2110 are connected to form a first connecting part 73, and the orthographic projection of the liquid inlet 31 onto the groove bottom wall 2110 is offset from the first connecting part 73. Here, "offset" means that they do not overlap.

[0137] For example, when the conductive portion 72 is welded to the groove bottom wall 2110 of the first accommodating groove 211 to form a weld mark, the liquid inlet hole 31 can be positioned so that the orthogonal projection of the first accommodating groove 211 onto the groove bottom wall 2110 is offset from the weld mark. This allows the electrolyte injected from the liquid inlet hole 31 to avoid the first connection portion 73 (e.g., the weld mark) between the conductive portion 72 and the pole body 2 as much as possible, thereby reducing contamination and corrosion of the first connection portion 73 (e.g., the weld mark) by the electrolyte.

[0138] 7 and 8, in some embodiments, the electrode post body 2 is formed in an elongated structure, and the first communication hole 221, into which the conductive portion 72 is inserted, is formed as an elongated hole whose length is greater than its width and which extends longitudinally from one end of the electrode post body 2 to the other end. This allows the space in the electrode post body 2 to be fully utilized, and by increasing the length of the first communication hole 221 as much as possible, the first communication hole 221 can pass through a larger conductive portion 72, thereby increasing the size of the conductive portion 72 and thereby improving current passage efficiency. When the first communication hole 221 is used as a liquid permeation hole 23, increasing the length of the first communication hole 221 also helps improve liquid injection efficiency.

[0139] In some embodiments, when the electrode post body 2 has an elongated structure and the first communication hole 221 into which the conductive part 72 is inserted is formed as an elongated hole whose length is greater than its width and which extends longitudinally from one end of the electrode post body 2 to the other end, the electrode post cover plate 3 is an elongated cover plate, i.e., the length of the electrode post cover plate 3 is greater than its width, and the liquid inlet hole 31 is eccentrically disposed in the longitudinal direction of the electrode post cover plate 3, i.e., the center point of the liquid inlet hole 31 on the electrode post cover plate 3 is on one side in the longitudinal direction of the electrode post cover plate 3. This allows the liquid inlet hole 31 to avoid the conductive part 72 as much as possible, thereby reducing contamination and corrosion of the first connection part 73 (e.g., weld mark) between the conductive part 72 and the electrode post body 2 by the injected electrolyte.

[0140] Furthermore, the electrode post body 2 has an elongated structure, and the electrode post cover plate 3 is an elongated cover plate, which facilitates a sufficient fit between the electrode post body 2 and the electrode post cover plate 3, facilitating an increase in the area of ​​the electrode post cover plate 3 and facilitating the assembly and connection of the electrode post cover plate 3 and the electrode post body 2. For example, the shape of the electrode post cover plate 3 may be an oval, rectangular, or elliptical shape. The oval shape may also be called a racetrack shape, i.e., both ends of the length of the rectangle are formed by splicing semicircles. The liquid inlet 31 may be located in a semicircular region or at the boundary between the semicircular region and the rectangular region. Of course, the present application is not limited thereto. In other embodiments of the present application, the liquid inlet 31 may also be located in the center of the electrode post cover plate 3. That is, the location of the liquid inlet 31 can be flexibly selected according to actual conditions.

[0141] In some embodiments of the present application, the pole body 2 is formed in an elongated structure, and the first accommodating groove 211 is formed in an elongated groove, i.e., the length of the first accommodating groove 211 is greater than the width, and the first accommodating groove 211 extends in the longitudinal direction from one end of the pole body 2 to the other end of the length, which helps to fully utilize the space of the pole body 2, thereby increasing the dimension of the first accommodating groove 211 and improving the injection efficiency.

[0142] In some embodiments of the present application, the groove wall of the first accommodating groove 211 on the side closest to the accommodating cavity 1A can be set to a slope extending downward toward the liquid permeable hole 23, which helps the electrolyte in the first accommodating groove 211 to flow quickly toward the liquid permeable hole 23, improves the injection efficiency, and alleviates the problem of liquid accumulation in the first accommodating groove 211.

[0143] 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 accommodating groove 211, thereby making full use of the space and increasing the dimensions of the first accommodating groove 211 as much as possible to improve the temporary storage capacity of the first accommodating groove 211.

[0144] In some embodiments of the present application, when the first receiving groove 211 is formed as an elongated groove, for example, the cross-sectional shape of the first receiving groove 211 can be an oval, rectangular, elliptical, etc., which can realize flexible installation. Among them, the oval shape can also be called a racetrack shape, that is, both ends of the length of the rectangle are formed by splicing semicircles.

[0145] In some embodiments, when the communication hole 22 into which the conductive portion 72 is inserted is a first communication hole 221, there are multiple first communication holes 221 and multiple conductive portions 72, and at least one conductive portion 72 is inserted into each first communication hole 221. In this case, the conductive portion 72 is inserted into at least two communication holes 22, thereby improving the problem of the local strength of the pole body 2 becoming weak due to the relatively large dimensions of a single first communication hole 221. Furthermore, when the first communication hole 221 is a liquid permeable hole 23, increasing the number of first communication holes 221 also helps to improve the liquid injection efficiency.

[0146] For example, when the first communication hole 221 is formed as an elongated hole whose length is greater than its width and which extends longitudinally from one end of the polar column body 2 to the other end of the length, the multiple first communication holes 221 can be disposed at intervals along the width direction of the polar column body 2. In this way, the space of the polar column body 2 can be utilized relatively fully, and the problem of localized weakness of the polar column body 2 due to the relatively large size of a single first communication hole 221 can be alleviated. Furthermore, when the first communication holes 221 are used as liquid permeation holes 23, increasing the number of first communication holes 221 also helps to improve liquid injection efficiency.

[0147] In some embodiments, when the electrode post body 2 is provided with both the first communication hole 221 and the second communication hole 222, if the first communication hole 221 is formed as an elongated hole whose length is greater than its width and extends longitudinally from one end of the electrode post body 2 to the other end of the length, the second communication hole 222 can be provided at at least one of the ends of the first communication hole 221, thereby allowing the electrolyte to be relatively away from the weld mark between the conductive part 72 and the electrode post body 2 and reducing contamination or corrosion of the weld mark by the injected electrolyte. Furthermore, when the second communication hole 222 is provided at both ends of the first communication hole 221, the injection efficiency can be improved, and the size of each second communication hole 222 can be reduced, thereby alleviating the problem of localized weakness of the electrode post body 2.

[0148] Of course, in the embodiments of the present application, the shape of the first communicating hole 221 and the relative positional relationship between the first communicating hole 221 and the second communicating hole 222 are not limited to the above description and can be adjusted according to actual conditions.

[0149] Of course, the present application is not limited to these. In other embodiments of the present application, the conductive portion 72 may not penetrate the communication hole 22 and may not enter the first accommodating groove 211. In this case, as shown in FIG. 9, the conductive portion 72 may be connected to the wall surface of the pole body 2 facing the accommodating cavity 1A so that the entire conductive portion 72 is located on the side of the first accommodating groove 211 that is close to the accommodating cavity 1A. In this case, each communication hole 22 may be a liquid permeable hole 23. As a result, when the electrolyte injected from the liquid injection hole 31 enters the first accommodating groove 211, it does not come into contact with the first connection portion 73 (e.g., a welding mark) between the conductive portion 72 and the electrode post main body 2, thereby reducing contamination and corrosion of the first connection portion 73 between the conductive portion 72 and the electrode post main body 2 by the injected electrolyte.In addition, the opening position of the liquid injection hole 31 can be flexibly selected, and there is no need to select the position of the liquid injection hole 31 to avoid the first connection portion 73 between the conductive portion 72 and the electrode post main body 2.

[0150] In some embodiments, as shown in FIG. 10 , the communication passage 2A further includes a second accommodating groove 212, which is located on the side of the first accommodating groove 211 closest to the accommodating cavity 1A and opens toward the accommodating cavity 1A to communicate with the accommodating cavity 1A. The pole body 2 is formed with a communication hole 22 connecting the first accommodating groove 211 and the second accommodating groove 212, and the communication hole 22 may be one or more, and at least one of the communication holes 22 may be a liquid-permeable hole 23 that penetrates the groove wall of the second accommodating groove 212 to communicate with the first accommodating groove 211 and the second accommodating groove 212.

[0151] When it is necessary to inject an electrolyte into the accommodating cavity 1A of the battery cell 102, the electrolyte can be injected through the liquid inlet 31. The liquid inlet 31 communicates with the first accommodating groove 211, so that the electrolyte that has entered the liquid inlet 31 can flow into the first accommodating groove 211. The first accommodating groove 211 also communicates with the second accommodating groove 212 through the communication holes 22, and at least one of the communication holes 22 functions as a liquid permeable hole 213 that allows the electrolyte to pass through. 3, and the electrolyte that has entered the first accommodating groove 211 can flow into the second accommodating groove 212 through the liquid permeation hole 23, and since the second accommodating groove 212 is connected to the accommodating cavity 1A, the electrolyte that has flowed into the second accommodating groove 212 can enter the accommodating cavity 1A, thereby realizing the injection of the electrolyte into the accommodating cavity 1A through the liquid injection hole 31, the first accommodating groove 211, the liquid permeation hole 23, and the second accommodating groove 212.

[0152] As a result, the second accommodating groove 212 can function as a temporary storage for the electrolyte or gas. When the battery cell 102 is filled, the second accommodating groove 212 can be used to temporarily store the electrolyte, thereby eliminating problems such as the electrolyte splashing out or spilling. Furthermore, when the battery cell 102 is in operation, gas is generated after the electrolyte is involved in a reaction, and the second accommodating groove 212 can be used to temporarily store the electrolyte or the gas generated in the accommodating cavity 1A, thereby eliminating problems such as the electrolyte spilling or excessive air pressure in the accommodating cavity 1A, thereby improving the reliability of the battery cell 102.

[0153] In some embodiments, as shown in FIG. 10 , when the pole body 2 has a second accommodating groove 212, the conductive part 72 can pass through at least one communication hole 22 and enter the first accommodating groove 211, and the hole through which the conductive part 72 passes is the first communication hole 221. In this case, the first communication hole 221 can be a liquid permeable hole 23, or the first communication hole 221 does not have to be a liquid permeable hole 23. The communication hole 22 connecting the first accommodating groove 211 and the second accommodating groove 212 can also be configured to further include at least one second communication hole 222 into which the conductive part 72 is not inserted, and the second communication hole 222 can be a liquid permeable hole 23. For the above, please refer to the description of the above embodiment that does not have the second accommodating groove 212, and the description thereof will be omitted here.

[0154] For example, when the pole body 2 has the second accommodating groove 212, as shown in FIG. 9 , the conductive portion 72 does not need to pass through the communicating hole 22 so as to be entirely located on the side of the first accommodating groove 211 closest to the accommodating cavity 1A. For example, the conductive portion 72 is connected to the wall surface of the pole body 2 facing the accommodating cavity 1A, so that the conductive portion 72 is connected to the groove wall of the second accommodating groove 212 on the side away from the accommodating cavity 1A (e.g., the groove top wall of the second accommodating groove 212). In this case, at least a portion of the conductive portion 72 can be accommodated in the second accommodating groove 212, thereby reducing the space in the accommodating cavity 1A occupied by the conductive portion 72 and saving space in the accommodating cavity 1A to accommodate the active material coated portion 71 with a larger volume. This is useful for improving the energy density of the battery cell 102, or for reducing the dimensions of the battery cell 102 without changing the energy density of the battery cell 102.

[0155] Furthermore, when the electrode post body 2 has the second accommodating groove 212 and the conductive portion 72 is connected to the wall surface of the electrode post body 2 facing the accommodating cavity 1A, each of the communication holes 22 can be made into a liquid permeation hole 23. As a result, when the electrolyte injected from the liquid inlet 31 enters the first accommodating groove 211, it does not come into contact with the first connection portion 73 (e.g., a weld mark) between the conductive portion 72 in the second accommodating groove 212 and the electrode post body 2, thereby reducing contamination and corrosion of the first connection portion 73 between the conductive portion 72 and the electrode post body 2 by the injected electrolyte. Therefore, the opening position of the liquid inlet 31 can be flexibly selected, and there is no need to select the position of the liquid inlet 31 to avoid the first connection portion 73 between the conductive portion 72 and the electrode post body 2.

[0156] In some embodiments of the present application, the liquid inlet 31 is disposed opposite the liquid passage hole 23. That is, when orthogonally projected along the axial direction of the liquid inlet 31, the orthogonal projection of the liquid passage hole 23 overlaps with at least a portion of the orthogonal projection of the liquid inlet 31. This allows the electrolyte injected through the liquid inlet 31 to flow directly toward the liquid passage hole 23 disposed opposite the liquid inlet 31, thereby achieving faster and more efficient liquid injection and improving liquid injection efficiency. It should be noted that the numbers of the liquid inlet 31 and the liquid passage holes 23 are not limited, and there may be at least one liquid inlet 31 or at least one liquid passage hole 23, and at least one liquid inlet 31 may be disposed opposite at least one liquid passage hole 23. It should be noted that the shapes of the liquid inlet 31 and the liquid passage hole 23 may be the same or different, and both can be flexibly selected according to actual circumstances.

[0157] For example, when the communication hole 22 does not include the second communication hole 222 and includes only the first communication hole 221, the first communication hole 221 is used as the liquid permeation hole 23. In this case, the liquid inlet 31 can be disposed opposite the first communication hole 221, i.e., when orthogonally projected along the axial direction of the liquid inlet 31, the orthogonal projection of the first communication hole 221 overlaps with at least a portion of the orthogonal projection of the liquid inlet 31. This allows the electrolyte injected through the liquid inlet 31 to flow directly toward the first communication hole 221 disposed opposite the liquid inlet 31, thereby achieving rapid and efficient liquid injection and improving liquid injection efficiency.

[0158] For example, when the pole body 2 is provided with both the first communication hole 221 and the second communication hole 222, and at least the second communication hole 222 is the liquid permeable hole 23, the second communication hole 222 can be disposed opposite the liquid inlet 31, i.e., orthogonally projected along the axial direction of the liquid inlet 31, the orthogonal projection of the second communication hole 222 overlaps with at least a portion of the orthogonal projection of the liquid inlet 31. This allows the electrolyte injected through the liquid inlet 31 to flow directly toward the second communication hole 222 disposed opposite the liquid inlet 31, thereby realizing rapid and efficient liquid injection and improving liquid injection efficiency.

[0159] Furthermore, the first communication hole 221 may be positioned offset from the liquid inlet 31, i.e., orthogonally projected along the axial direction of the liquid inlet 31, so that the orthogonal projection of the first communication hole 221 does not overlap with the orthogonal projection of the liquid inlet 31. In this way, the electrolyte injected from the liquid inlet 31 can avoid flowing in the direction of the first communication hole 221, thereby reducing the risk of the electrolyte contaminating the conductive part 72 inserted in the first communication hole 221 and the first connection part 73 between the electrode post body 2. However, this is not limited to this, and in some embodiments of the present application, the liquid inlet 31 may be positioned to face both the second communication hole 222 and the first communication hole 221, as necessary.

[0160] Furthermore, when the conductive portion 72 is connected to the wall surface of the pole body 2 facing the accommodating cavity 1A (regardless of whether the communicating passage 2A includes the second accommodating groove 212), each of the communicating holes 22 can be a liquid permeable hole 23, and in some embodiments, the liquid inlet 31 faces at least one of the communicating holes 22, and each of the communicating holes 22 is positioned offset from the first connection portion 73 (e.g., the welding mark) between the conductive portion 72 and the pole body 2, that is, they can be positioned so that they are orthogonally projected along the axial direction of the liquid inlet 31 and the orthogonal projection of each communicating hole 22 does not overlap with the orthogonal projection of the first connection portion 73, thereby improving the liquid inlet efficiency and reducing contamination and corrosion of the welding mark by the electrolyte.

[0161] As can be seen, the electrode post cover plate 3 is located outside at least a portion of the electrode post body 2 (i.e., the side away from the receiving cavity 1A), thereby taking the form that the electrode post cover plate 3 is covered on the electrode post body 2, and in this way, the liquid inlet hole 31 in the electrode post cover plate 3 can be located upstream of the communication passage 2A in the electrode post body 2. However, it should be noted that the assembly method of the electrode post cover plate 3 and the electrode post body 2 is not limited, and for example, the electrode post cover plate 3 may be located completely outside the electrode post body 2 (i.e., the side away from the receiving cavity 1A), or the electrode post cover plate 3 may also be partially fitted into the electrode post body 2.

[0162] For example, in some embodiments of the present application, as shown in FIG. 6 , at least a portion of the electrode post cover plate 3 is fitted into the first accommodating groove 211, and the first accommodating groove 211 serves as a part of the communication passage 2A, thereby forming a cavity between the electrode post cover plate 3 and the groove wall of the first accommodating groove 211. In this way, the electrode post cover plate 3 occupies the space within the first accommodating groove 211, and at the same time, it is ensured that there is still space within the first accommodating groove 211 for the electrolyte to flow through. This allows the electrolyte injected through the injection hole 31 of the electrode post cover plate 3 to pass through the cavity and enter the liquid permeation hole 23, thereby satisfying the need for electrolyte injection. The cavity can also temporarily store the electrolyte, thereby alleviating problems such as the electrolyte splashing out or spilling. Furthermore, when the battery cell 102 is in use, the cavity can be used to temporarily store gas generated within the battery cell 102 or electrolyte spilled from the accommodating cavity 1A, further helping to improve the operational reliability of the battery cell 102. Furthermore, when the battery cell 102 is manufactured, the cavity can also temporarily store injected electrolyte, preventing electrolyte spillage and improving injection efficiency. Furthermore, by fitting at least a portion of the electrode post cover plate 3 into the first accommodating groove 211, the space occupied by the electrode post cover plate 3 outside the electrode post body 2 is reduced, thereby improving the compactness of the structure.

[0163] 10 , the edge of the electrode post cover plate 3 has an overlapping portion 32 that overlaps the electrode post body 2 on the side away from the receiving cavity 1A. This facilitates fitting and connection between the electrode post cover plate 3 and the electrode post body 2, and also makes it easier to control the height of the cavity between the electrode post cover plate 3 and the groove wall of the first receiving groove 211, so that the cavity volume meets design needs. Furthermore, if the overlapping portion 32 is welded to the electrode post body 2 and the electrode post body 2 has a liquid permeable hole 23, the overlapping portion 32 can be spaced from the liquid permeable hole 23. Therefore, if the electrolyte passes through the liquid permeable hole 23 and spills, the electrolyte can be spaced from the welded portion between the overlapping portion 32 and the electrode post body 2, thereby alleviating problems such as corrosion and contamination at the welded portion.

[0164] 10 , when the communication passage 2A includes the first receiving groove 211, the surface of the pole body 2 away from the receiving cavity 1A has a notch groove 25 surrounding the first receiving groove 211, and at least a portion of the overlapping portion 32 is fitted into the notch groove 25 so that the overlapping portion 32 is fitted onto the side of the pole body 2 away from the receiving cavity 1A. This allows the notch groove 25 to function as a positioning mechanism, improving the assembly efficiency of the pole body 2 and the pole cover plate 3, and also allows the notch groove 25 to function as a positioning restriction mechanism to a certain extent, improving the stability and reliability of the fit between the pole body 2 and the pole cover plate 3. In addition, the provision of the notch groove 25 allows the pole cover plate 3 to be further fitted into the pole body 2, so that the pole cover plate 3 protrudes less or not at all from the pole body 2, thereby helping to reduce the space occupied by the pole body 2.

[0165] 10 and 11, there is a fitting gap 26 between the overlapping portion 32 and the side wall of the cutout groove 25, and the dimension W of one end of the fitting gap 26 away from the receiving cavity 1A is less than 0.05 mm, i.e., the fitting gap 26 is greater than 0 mm and less than 0.05 mm. This allows, on the one hand, the overlapping portion 32 of the terminal post cover plate 3 to be smoothly assembled into the cutout groove 25 of the terminal post body 2, and on the other hand, the fitting gap 26 between them is not too large, which can improve the welding yield between the overlapping portion 32 and the terminal post body 2 when welding is used to connect the overlapping portion 32 and the terminal post body 2. It should be noted that the welding method between the overlapping portion 32 and the terminal post body 2 is not limited, and for example, hot melt welding or brazing can be used. For example, the overlapping portion 32 and the terminal post body 2 can be welded using a continuous laser.

[0166] In some embodiments of the present application, the shape of the electrode post cover plate 3 matches the cross-sectional shape of the first accommodating groove 211. This allows the electrode post cover plate 3 to seal the first accommodating groove 211, and the first accommodating groove 211 can be sealed after the inlet hole 31 of the electrode post cover plate 3 is sealed, thereby simplifying the sealing measures for the first accommodating groove 211, saving on the use of parts, simplifying the structure, facilitating assembly, and reducing costs. Furthermore, matching the cross-sectional shape of the overlapping portion 32 to the cutout groove 25 can better ensure that the fitting gap 26 between the overlapping portion 32 and the side wall of the cutout groove 25 is uniform.

[0167] In some embodiments of the present application, as shown in FIG. 10 , the pole body 2 may include an outer stopper portion 271 that is stopped and positioned on the outside of the casing 1, and an inner stopper portion 272 that is stopped and positioned on the inside of the casing 1. The overlapping portion 32 overlaps the outer stopper portion 271, and the pole body 2 is riveted to the casing 1 to form the outer stopper portion 271. That is, the pole body 2 is fixed to the casing 1 by riveting, and the outer stopper portion 271 is formed after the pole body 2 is riveted. That is, the pole body 2 may not have the outer stopper portion 271 before riveting, and the outer stopper portion 271 may be formed after riveting. For example, the pole body 2 may be first formed by a stamping process, and then the pole body 2 may be fixed to the casing 1 by riveting.

[0168] This simplifies the pre-processing (e.g., stamping process) of the terminal post body 2 before riveting in order to easily obtain the outer stopper portion 271, and when the structure of the outer stopper portion 271 is relatively complicated, the mold (e.g., stamping mold) for pre-processing the terminal post body 2 can be simplified, thereby reducing production costs. In addition, the terminal post body 2 riveted to the casing 1 may be an integrally molded product, which allows the terminal post body 2 to be reliably connected to the casing 1 and provides a stable and reliable connection between the outer stopper portion 271 and the inner stopper portion 272, helping to improve the connection reliability between the terminal post body 2 and the terminal post cover plate 3.

[0169] Of course, the present application is not limited thereto, and for example, in other embodiments, the inner stopper portion 272 can be processed by riveting. Alternatively, in other embodiments, the pole body 2 can be obtained by adopting a process other than riveting, for example, the pole body 2 can be divided into two parts and connected by welding to be fixed to the casing 1.

[0170] 10 , the battery cell 102 may further include a sealing pad 1023 (e.g., a sealing ring) and an insulating pad 1024 (e.g., a plastic pad), which are sandwiched between the pole body 2 and the casing 1 and riveted to the pole body 2 to secure the sealing pad 1023 and the insulating pad 1024 between the pole body 2 and the casing 1, thereby improving production efficiency and avoiding adverse thermal effects on the sealing pad 1023 and the insulating pad 1024 due to the welding process. For example, during riveting, the compression amount of the sealing pad 1023 (i.e., the difference between the thickness of the sealing pad 1023 before and after deformation divided by the thickness before deformation) may be 15% or more, thereby ensuring hermetic sealing.

[0171] In some embodiments of the present application, the injection hole 31 is provided in the cathode pole cover plate 3, and the cathode pole cover plate 3 and the cathode pole body 2 are made of the same material. Illustratively, the pole cover plate 3 is welded to the pole body 2, and the pole cover plate 3 is also welded to the bus bar 103. When the pole cover plate 3 and the pole body 2 are made of the same material, the welding yield between them is relatively high, and when the pole cover plate 3 and the bus bar 103 are made of the same material, the welding yield between them is relatively high. The cathode pole body 2 is typically made of aluminum, and the cathode bus member 103 is typically made of aluminum. Therefore, the cathode pole cover plate 3 can also be made of aluminum, which allows the cathode pole cover plate 3, the cathode pole body 2, and the cathode bus member 103 to have a better welding yield. When an injection hole 31 is installed on the cathode pole cover plate 3, the electrolyte will flow to the welded portion between the cathode pole cover plate 3 and the cathode pole body 2. Since the welded portion is made of the same material (e.g., aluminum and aluminum), the welded portion is less susceptible to corrosion, which helps to improve the connection reliability between the pole cover plate 3 and the pole body 2.

[0172] 12 , the electrode post cover plate 3 includes a first cover plate portion 331 and a second cover plate portion 332, the first cover plate portion 331 and the electrode post body 2 are made of the same material, the first cover plate portion 331 is connected to the electrode post body 2, and the second cover plate portion 332 is connected to the first cover plate portion 331, and the liquid inlet 31 is located in the first cover plate portion 331 or the second cover plate portion 332. In the above technical solution, when the liquid inlet 31 is located in the electrode post cover plate 3 made of a composite material and the first cover plate portion 331 and the electrode post body 2 are made of the same material, the electrolyte flows to the welded portion between the first cover plate portion 331 and the electrode post body 2. Since the welded portion is made of the same material, the welded portion is less susceptible to corrosion and helps to improve the connection reliability between the electrode post cover plate 3 and the electrode post body 2.

[0173] It should be noted that the assembly method of the first cover plate portion 331 and the second cover plate portion 332 is not limited. For example, when projected orthogonally along the axial direction of the liquid injection hole 31, the orthogonal projection of the first cover plate portion 331 and the orthogonal projection of the second cover plate portion 332 have a non-overlapping portion, and the liquid injection hole 31 can be installed in the non-overlapping portion. In this way, the injected electrolyte is less likely to corrode and contaminate the welded portion between the first cover plate portion 331 and the second cover plate portion 332, which helps to improve the reliability of the electrode post cover plate 3.

[0174] For example, the anode pole body 2 is typically made of copper, the anode bus member 103 is typically made of aluminum, and the anode pole cover plate 3 is also made of aluminum. When the inlet 31 is installed on the anode pole cover plate 3, the electrolyte will flow to the welded portion between the anode pole cover plate 3 and the anode pole body 2. Since the welded portion is made of a combination of different materials (e.g., aluminum and copper), the welded portion is prone to corrosion. Therefore, in some embodiments of the present application, the anode pole cover plate 3 can be made of a composite material of copper and aluminum. The first cover plate portion 331 of the anode pole cover plate 3, made of copper, is welded to the anode pole body 2, and the second cover plate portion 332 of the anode pole cover plate 3, made of aluminum, is welded to the anode bus member 103, thereby improving the anode pole cover plate 3, the anode pole body 2, and the anode bus member 103, respectively. It has good welding yield, and in this way, when the injection hole 31 is installed on the composite material anode pole cover plate 3, it may be provided on the first cover plate portion 331 or on the second cover plate portion 332, and the electrolyte flows to the welded part between the anode pole cover plate 3 and the anode pole body 2, and since the welded part is a combination of the same type of material (e.g., copper and copper), the welded part is less likely to corrode, which helps to improve the connection reliability between the pole cover plate 3 and the pole body 2.

[0175] It should be noted that the shape and size of the injection hole 31 are not limited and can be specifically selected according to the actual situation.

[0176] In some embodiments of the present application, as shown in FIGS. 13 and 14 , the flow area of ​​the inlet end 31a of the inlet 31 is larger than the flow area of ​​the drain end 31b of the inlet 31. When the electrolyte is injected into the inlet 31, it flows from the inlet end 31a to the drain end 31b. By making the flow area of ​​the inlet end 31a of the inlet 31 larger than the flow area of ​​the drain end 31b of the inlet 31, the inlet 31 can be easily fitted with an injection nozzle. For example, this makes it easier to insert an injection nozzle into the inlet end 31a of the inlet 31, thereby reducing the likelihood of leakage during the electrolyte injection process. Furthermore, the relatively large flow area of ​​the inlet end 31a of the inlet 31 makes it easier to attach a seal structure 1022 to seal the inlet 31.

[0177] In some embodiments of the present application, in combination with FIG. 15 , the inlet hole 31 includes a first hole section 311 and a second hole section 312. That is, in some embodiments, the inlet hole 31 includes at least a first hole section 311 and a second hole section 312. Along the inlet flow direction, the first hole section 311 is located upstream of the second hole section 312. The flow area of ​​the first hole section 311 gradually decreases or remains unchanged from the first hole section 311 to the second hole section 312. The flow area of ​​the second hole section 312 gradually decreases or remains unchanged from the first hole section 311 to the second hole section 312. The flow area of ​​the outlet end of the first hole section 311 is equal to or greater than the flow area of ​​the inlet end of the second hole section 312. In this way, the flow area of ​​the supply end 31 a of the inlet hole 31 can be greater than the flow area of ​​the discharge end 31 b of the inlet hole 31.

[0178] Thus, when the electrolyte is injected into the injection hole 31, it first flows through the first hole section 311 and then through the second hole section 312. 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, 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 the flow area of ​​the outlet end of the first hole section 311 is equal to the flow area of ​​the inlet end of the second hole section 312. Since the flow area is greater than or equal to the flow area, the flow area of ​​the first hole section 311 is relatively large, which makes it easier for the first hole section 311 to be fitted to the injection nozzle. The first hole section 311 can also serve to temporarily store the electrolyte, which improves the injection efficiency and helps reduce the risk of the electrolyte splashing out or spilling. It also makes it easier to assemble a sealing structure 1022 to the injection hole 31 to ensure reliable sealing of the injection hole 31 after injection.

[0179] In some embodiments of the present application, in combination with Figure 16, the inlet hole 31 is composed of a first hole section 311 and a second hole section 312, i.e., the inlet hole 31 only includes two hole sections, the first hole section 311 and the second hole section 312, the inlet end of the first hole section 311 forms the supply end 31a of the inlet hole 31, and the outlet end of the second hole section 312 forms the discharge end 31b of the inlet hole 31, the flow area of ​​the first hole section 311 gradually decreases in 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 equal to the flow area of ​​the inlet end of the second hole section 312.

[0180] As a result, the injection hole 31 is two-stage, and the first stage 311 is approximately funnel-shaped. The side walls of the first stage 311 can have a flow-guiding effect, so that the electrolyte that enters the first stage 311 can quickly flow toward the second stage 312, thereby improving the injection efficiency. Furthermore, since the flow area of ​​the outlet end of the first stage 311 is equal to the flow area of ​​the inlet end of the second stage 312, no step is formed between the first stage 311 and the second stage 312. Furthermore, due to the funnel shape of the first stage 311, it is difficult for liquid to accumulate within the first stage 311.

[0181] In some embodiments of the present application, in combination with FIG. 17 , the inlet hole 31 further includes a third hole section 313, which is located between the first hole section 311 and the second hole section 312 along the inlet flow direction, the flow area of ​​the third hole section 313 gradually decreases along the direction from the first hole section 311 to the second hole section 312, the flow area of ​​the inlet end of the third hole section 313 is less than or equal to the flow area of ​​the outlet end of the first hole section 311, and the flow area of ​​the outlet end of the third hole section 313 is equal to the flow area of ​​the inlet end of the second hole section 312.

[0182] As a result, when the electrolyte is injected into the injection hole 31, it first flows through the first hole section 311, then the third hole section 313, and finally the second hole section 312. The flow area of ​​the inlet end of the third hole section 313 is less than or equal to the flow area of ​​the outlet end of the first hole section 311, which means that the flow area of ​​the first hole section 311 is relatively large, which makes it easier to fit the first hole section 311 into the injection nozzle. The first hole section 311 can also serve as a temporary storage area for the electrolyte, which improves injection efficiency and reduces the risk of the electrolyte spilling or spilling. It also makes it easier to assemble a sealing structure 1022 on the injection hole 31 to ensure that the injection hole 31 is securely sealed after injection. The flow area of ​​the third perforation stage 313 gradually decreases from the first perforation stage 311 to the second perforation stage 312, giving the third perforation stage 313 an approximately funnel shape. The side walls of the third perforation stage 313 have a flow-guiding function, allowing the electrolyte that enters the third perforation stage 313 to quickly flow toward the second perforation stage 312, thereby improving the injection efficiency. Furthermore, the flow area of ​​the outlet end of the third perforation stage 313 is equal to the flow area of ​​the inlet end of the second perforation stage 312, so no step is formed between the third perforation stage 313 and the second perforation stage 312. Furthermore, due to the funnel shape of the third perforation stage 313, it is difficult for liquid to accumulate within the third perforation stage 313.

[0183] It should be noted that in some embodiments of the present application, a sealing structure 1022 can be installed in the liquid filling hole 31 to ensure the sealing of the liquid filling hole 31 after filling. For example, in some embodiments of the present application, in combination with FIG. 14 , the sealing structure 1022 can be installed to fit into the pole cover plate 3 to seal the liquid filling hole 31, thereby ensuring the sealing of the liquid filling hole 31, preventing electrolyte spillage, and preventing external foreign matter from entering the receiving cavity 1A through the liquid filling hole 31, thereby improving the reliability of the battery cell 102.

[0184] 14 , the electrode post cover plate 3 does not have a portion that abuts the outside of the sealing structure 1022 (i.e., the side away from the receiving cavity 1A), so that the sealing structure 1022 can be attached to the electrode post cover plate 3 from the outside of the electrode post cover plate 3 (i.e., the side away from the receiving cavity 1A). In this way, the sealing structure 1022 is installed so that it can be attached to the electrode post cover plate 3 from the outside, thereby sealing the liquid inlet hole 31. As a result, the sealing structure 1022 is installed after liquid injection, ensuring the sealing of the liquid inlet hole 31. Furthermore, since the installation position is close to the outside, the sealing structure 1022 can be quickly assembled. Furthermore, the installation of the sealing structure 1022 does not adversely affect the connection between the electrode post body 2 and the electrode post cover plate 3, ensuring the reliability of the connection between the electrode post cover plate 3 and the electrode post body 2.

[0185] The seal structure 1022 may be detachable or non-detachably fixed. For example, as shown in FIG. 18 , a detachable seal structure 1022 facilitates maintenance of the liquid inlet 31. For example, when electrolyte needs to be refilled, the seal structure 1022 is detached, the liquid inlet 31 is opened, and the electrolyte is refilled and injected into the receiving cavity 1A through the liquid inlet 31. The seal structure 1022 is then reattached by a screw or other method to detachably connect the seal structure 1022 to the electrode post cover plate 3, thereby facilitating attachment and detachment. For example, as shown in FIG. 14 , a non-detachable seal structure 1022 may be fixed to the electrode post cover plate 3 by welding, riveting, or other methods, thereby improving the sealing reliability of the seal structure 1022 relative to the liquid inlet 31.

[0186] 14 , at least a portion of the seal structure 1022 is fitted within the liquid fill hole 31. That is, the entire seal structure 1022 may be fitted within the liquid fill hole 31, or only a portion of the seal structure 1022 may be fitted within the liquid fill hole 31. This, on the one hand, makes full use of the space within the liquid fill hole 31 and improves the sealing reliability of the seal structure 1022 relative to the liquid fill hole 31, and on the other hand, reduces the height of the seal structure 1022 protruding outside the liquid fill hole 31, thereby reducing the space occupied by the seal structure 1022 outside the electrode post cover plate 3, which helps reduce the overall size of the battery cell 102.

[0187] 19 and 20 , the seal structure 1022 may include a first seal member 4, and at least a portion of the first seal member 4 is fitted into and press-fit into the liquid inlet 31 to seal the liquid inlet 31. This allows the first seal member 4 to be fixed by press-fitting, which helps to quickly install the first seal member 4 and improves the sealing reliability of the first seal member 4 with respect to the liquid inlet 31.

[0188] In some embodiments of the present application, the seal structure 1022 may include a second seal member 5 that covers the liquid supply end 31a of the liquid filling hole 31 and is sealed and connected to the pole cover plate 3. Specifically, the phrase "the second seal member 5 covers the liquid supply end 31a of the liquid filling hole 31" is understood in a broad sense, and the second seal member 5 may be disposed on the outside of the liquid supply end 31a or may be fitted inside the liquid supply end 31a, as long as it is located near the liquid supply end 31a and seals and caps the liquid supply end 31a. This allows sealing to be performed from the source of the liquid filling hole 31 (i.e., the liquid supply end 31a), thereby reducing the possibility of contamination of the liquid filling hole 31 by foreign matter. Furthermore, disposing the second seal member 5 on the liquid supply end 31a of the liquid filling hole 31 facilitates rapid assembly of the second seal member 5 and improves the assembly efficiency of the second seal member 5.

[0189] Specifically, the method of fitting the second seal member 5 to the electrode post cover plate 3 is not limited, and for example, in some embodiments, the edge of the second seal member 5 can be overlapped on the outside of the electrode post cover plate 3 (i.e., the edge of the second seal member 5 can be overlapped on the side of the electrode post cover plate 3 away from the receiving cavity 1A), and / or at least a portion of the second seal member 5 can be fitted into the liquid inlet hole 31, and the second seal member 5 can be fitted and hermetically welded to the electrode post cover plate 3. In this way, the overlapping and / or fitting method is useful for assembling and positioning the second seal member 5, and the welding method can achieve a hermetically sealed connection between the second seal member 5 and the electrode post cover plate 3, thereby improving the reliability of the hermetically sealed connection between the second seal member 5 and the electrode post cover plate 3.

[0190] In some embodiments, the inlet 31 includes a first hole section 311 and a second hole section 312 arranged in sequence along the inlet flow direction, the diameter of the first hole section 311 being larger than the diameter of the second hole section 312, i.e., the flow area of ​​any cross section of the first hole section 311 being larger than the flow area of ​​any cross section of the second hole section 312, and at least a portion of the second seal member 5 being fitted into the first hole section 311 and covering the second hole section 312. It should be noted that the shape of the inlet 31 in this embodiment may further be selected from any one of the above embodiments, for example, the flow area of ​​the first hole section 311 gradually decreases or remains constant 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 constant along the direction from the first hole section 311 to the second hole section 312.

[0191] In the above technical solution, the portion of the second sealing member 5 that is fitted into the first hole section 311 can cover the second hole section 312, thereby ensuring a reliable seal for the liquid filling hole 31. Furthermore, because the first hole section 311 has a relatively large diameter, fitting at least the second sealing member 5 into the first hole section 311 facilitates assembly and positioning of the second sealing member 5, eliminates the need for positioning clamps for connection, and facilitates connection between the second sealing member 5 and the pole cover plate 3. Furthermore, the space occupied by the second sealing member 5 outside the pole cover plate 3 can be reduced, which helps reduce the overall size of the battery cell 102.

[0192] It should be noted that the cross section of the inlet 31 may be circular, but is not limited to circular, and may be other shapes such as polygonal, elliptical, or oval. Furthermore, if the inlet 31 has multiple sections, the sections may all have circular cross sections, or at least one section may not have a circular cross section. The "hole diameter" of a section with a non-circular cross section may be understood as the equivalent diameter of the corresponding section.

[0193] 19, the edge of the second seal 5 is sealingly connected to the hole wall of the first hole section 311. In the above technical solution, the edge of the second seal 5 is sealingly connected to the hole wall of the first hole section 311, which means that the second seal 5 can be completely accommodated within the first hole section 311 in the radial direction of the first hole section 311, thereby further reducing the space other than the electrode post cover plate 3 occupied by the second seal 5 and improving the compactness of the fit between the second seal 5 and the electrode post cover plate 3. In addition, the hole wall of the first hole section 311 restricts the position of the edge of the second seal 5, which improves the stability and reliability of the connection between the second seal 5 and the electrode post cover plate 3. For example, the second sealing member 5 can also be completely sunk into the first hole section 311 in the axial direction of the first hole section 311, which helps to further reduce the space occupied by the second sealing member 5 other than the pole column cover plate 3.

[0194] 20 , the second seal 5 includes an extension 51 that extends outward from the first recess 311 and is fitted over and sealingly connected to the wall surface of the electrode post cover plate 3 away from the receiving cavity 1A. This allows the radial dimension of the extension 51 to be increased as needed, thereby increasing the sealing connection area between the second seal 5 and the electrode post cover plate 3 and improving the reliability of the sealing connection between the second seal 5 and the electrode post cover plate 3. Furthermore, the requirements for the shape of the first recess 311 are relatively low, eliminating the need for a clearance fit between the edge of the second seal 5 and the hole wall of the first recess 311 to meet shape requirements. This reduces the machining precision of the electrode post cover plate 3 and the second seal 5, improving production efficiency and reducing production costs.

[0195] 20, in some embodiments, the liquid inlet 31 forms a stepped surface 314 at the connection between the first hole section 311 and the second hole section 312, and the portion of the second seal member 5 fitted into the first hole section 311 is supported by the stepped surface 314. This improves the connection stability between the second seal member 5 and the pole cover plate 3.

[0196] In some embodiments, the seal structure 1022 further includes a first seal member 4 that is tightly fitted into the second hole section 312 and is located on the side of the second seal member 5 that is closest to the receiving cavity 1A. In the above technical solution, the seal structure 1022 simultaneously includes the first seal member 4 and the second seal member 5, and the second seal member 5 can prevent the first seal member 4 from detaching from the inlet hole 31, improving the reliability of the sealing fit between the first seal member 4 and the second hole section 312 and further improving the sealing reliability of the entire seal structure 1022 relative to the inlet hole 31. In addition, fixing the first seal member 4 by a tight fit facilitates quick installation of the first seal member 4.

[0197] Furthermore, if the first hole section 311 is installed as described above, that is, "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 equal to or greater than the flow area of ​​the inlet end of the second hole section 312," this will be helpful for assembling and connecting the second sealing member 5.

[0198] 19 , the second seal member 5 includes a recess 54 that protrudes away from the first seal member 4, and the side of the recess 54 facing the first seal member 4 forms a recess cavity 55, with a portion of the first seal member 4 extending into the recess cavity 55. The above technical solution improves the compactness of the fit between the first seal member 4 and the second seal member 5, reduces space occupation and waste, and reduces the volume of the battery cell 102. Furthermore, by forming the second seal member 5 into a concave-convex shape, the structural strength of the second seal member 5 can be improved, and the reliability and stability of the fit between the second seal member 5 and the pole cover plate 3 can be improved.

[0199] In some embodiments of the present application, as shown in Figures 19 and 20, the seal structure 1022 simultaneously includes a first seal member 4 and a second seal member 5, and at least a portion of the first seal member 4 is fitted into and press-fit into the liquid inlet hole 31 to seal the liquid inlet hole 31, and the edge of the second seal member 5 overlaps the outside of the electrode post cover plate 3 (combined with Figure 20, i.e., the edge of the second seal member 5 overlaps the side of the electrode post cover plate 3 away from the accommodating cavity 1A), and / or at least a portion of the second seal member 5 is fitted into the liquid inlet hole 31 (combined with Figures 19 and 20), and the second seal member 5 is fitted into the electrode post cover plate 3 in a hermetically welded manner, and the second seal member 5 is located on the side of the first seal member 4 away from the accommodating cavity 1A. As a result, the first sealing member 4 can effectively seal the liquid inlet hole 31, and the second sealing member 5 can not only seal the liquid inlet hole 31 but also prevent the first sealing member 4 from detaching from the liquid inlet hole 31, thereby improving the sealing reliability of the seal structure 1022 with respect to the liquid inlet hole 31.

[0200] Illustratively, the first seal member 4 may be made of a material such as plastic or rubber, which helps to improve the interference fit and sealing effect.

[0201] For example, the second seal member 5 may be made of the same metal material as the electrode post cover plate 3, for example, an aluminum member, which helps to improve the welding yield between the second seal member 5 and the electrode post cover plate 3. It should also be noted that the welding method between the second seal member 5 and the electrode post cover plate 3 is not limited, and may be, for example, hot melt welding or brazing, or may be used, for example, pulse laser welding, which improves manufacturing efficiency and the degree of automation.

[0202] It should be noted that laser welding has relatively high requirements for the cleanliness of the injection hole 31, and if an electrolyte remains in the injection hole 31, the electrolyte is likely to evaporate due to heat, and the evaporated exhaust gas will penetrate the welding molten pool, causing defects such as pinholes and explosion points at the welded portion. The injection hole 31 is composed of a first hole section 311 and a second hole section 312, 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, and the flow area of ​​the outlet end of the first hole section 311 is equal to the flow area of ​​the inlet end of the second hole section 312; or the injection hole 31 further includes a third hole section 313, which is located between the first hole section 311 and the second hole section 312 along the injection flow direction, and the flow area of ​​the third hole section 313 is equal to the flow area of ​​the If the flow area of ​​the third hole section 313 is gradually reduced from the first hole section 311 to the second hole section 312, and the flow area of ​​the inlet end of the third hole section 313 is equal to or less than the flow area of ​​the outlet end of the first hole section 311 and equal to the flow area of ​​the inlet end of the second hole section 312, the problem of liquid accumulation in the injection hole 31 can be alleviated, thereby improving the welding yield between the second sealing member 5 and the pole cover plate 3 and enhancing the sealing performance.

[0203] In some embodiments of the present application, after welding the electrode post cover plate 3 to the electrode post body 2, electrolyte is injected through the fill hole 31 in the electrode post cover plate 3. The electrolyte flows from the fill hole 31 through the connecting passage 2A in the electrode post body 2 and enters the casing 1 of the battery cell 102. This eliminates the need for additional auxiliary structures below the fill hole 31 and the connecting passage 2A, simplifying the structure and reducing costs. After the filling process is complete, a first seal 4 is first installed in the fill hole 31 to achieve pre-sealing, a second seal 5 is then installed in the fill hole 31, and the second seal 5 is then welded to the electrode post cover plate 3 to achieve a tight seal. Furthermore, if a conductive part 72 needs to pass through the first connecting hole 221, the conductive part 72 is first inserted and welded to the electrode post body 2, then the electrode post cover plate 3 is welded to the electrode post body 2, and finally the electrolyte is injected.

[0204] 14 , in some embodiments, the second seal 5 may include a central portion 52 and an edge portion 53 surrounding the central portion 52. The central portion 52 is fitted over the inlet 31, and the edge portion 53 is overlapped with and hermetically connected to a portion of the wall of the electrode post cover plate 3 away from the receiving cavity 1A, surrounding the inlet 31. This reduces requirements for the shape of the inlet 31 and eliminates the need to increase the thickness of the electrode post cover plate 3 to machine the inlet 31 into a complex shape. This allows for a thinner electrode post cover plate 3. Furthermore, the positioning and fitting between the second seal 5 and the electrode post cover plate 3 is stable, which helps improve the stability and reliability of the connection between the second seal 5 and the electrode post cover plate 3. Furthermore, the compactness of the fit between the second seal 5 and the electrode post cover plate 3 helps save space. Furthermore, the overlapping connection between the second seal 5 and the electrode post cover plate 3 facilitates quick connection between the two.

[0205] It should be noted that the seal structure 1022 may include only the first seal member 4, or may include only the second seal member 5, or may simultaneously include the first seal member 4 and the second seal member 5. In the above embodiments, unless it is stated that the seal structure 1022 simultaneously includes the first seal member 4 and the second seal member 5, it is possible to specifically select whether to install the first seal member 4 alone, or the second seal member 5 alone, or to install the first seal member 4 and the second seal member 5 simultaneously, as needed, and this is not limited here.

[0206] In some embodiments of the present application, the casing 1 includes a first casing wall 11, and the pole body 2 is disposed on the first casing wall 11. As shown in Fig. 6, the first casing wall 11 and at least one second casing wall 12 are integrally formed, and the second casing wall 12 extends toward one side of the first casing wall 11 in the thickness direction. Alternatively, as shown in Fig. 21, the first casing wall 11 is an integrally formed cover plate. This allows for flexible design of the pole 1020 position, thereby broadening the application range of the battery cell 102 of the embodiments of the present application.

[0207] It should be explained that the second casing wall 12 can extend from an edge of the first casing wall 11, and when the first casing wall 11 is rectangular, at least one of the four edges of the first casing wall 11 can extend from the second casing wall 12; for example, only one edge of the first casing wall 11 can extend from the second casing wall 12, or only two edges of the first casing wall 11 can extend from the second casing wall 12, or three edges of the first casing wall 11 can extend from the second casing wall 12, or all four edges of the first casing wall 11 can extend from the second casing wall 12. For example, when the casing 1 is a rectangular casing, any one wall of the rectangular casing can be the first casing wall 11.

[0208] For example, the casing 1 may include a casing body defining a space with one open side, and a cover plate provided on the open side of the casing body to form an accommodating cavity 1A between the casing body and the cover plate, in which case the wall surface of the casing body facing the cover plate is the first casing wall 11, and the wall surface connected between the first casing wall 11 of the casing body and the cover plate is the second casing wall 12, or the wall surface of the casing body facing the cover plate is the second casing wall 12, and the wall surface connected between the second casing wall 12 of the casing body and the cover plate is the first casing wall 11, and / or the cover plate is the first casing wall 11, or any of the above.

[0209] 2 and 22 , according to some embodiments of the present application, the present application further provides a battery 100 including a bus member 103 and battery cells 102 of any one of the above forms, where the battery cells 102 are multiple, and at least two of the battery cells 102 are electrically connected by the bus member 103. This allows series connection and / or parallel connection of the multiple battery cells 102. Both the performance and manufacturability of the battery cells 102 according to the embodiments of the present application are improved, thereby helping to improve the performance and manufacturability of the battery 100. It should be noted that the battery 100 according to the embodiments of the present application may or may not include a case 101.

[0210] For example, when multiple battery cells 102 are connected in series, the positive electrode pole cover plate 3 of one battery cell 102 is connected to the negative electrode pole cover plate 3 of the next battery cell 102 by one bus member 103, and at the same time, the negative electrode pole cover plate 3 of the battery cell 102 is connected to the positive electrode pole cover plate 3 of the previous battery cell 102 by another bus member 103.

[0211] 22 , the bus member 103 and the surface of the electrode post cover plate 3 facing away from the receiving cavity 1A (i.e., the outer surface) are connected to form the second connection portion 104 (e.g., by welding to form a weld mark), and the liquid inlet 31 is offset from the second connection portion 104, i.e., the liquid inlet 31 does not overlap with the second connection portion 104. This reduces the risk of electrolyte spilling from the liquid inlet 31 contaminating or corroding the second connection portion 104 and also reduces the impact of the seal structure 1022, which seals the liquid inlet 31, on the connection between the bus member 103 and the electrode post cover plate 3, thereby improving the convenience and reliability of the connection between the bus member 103 and the electrode post cover plate 3.

[0212] In some embodiments, as shown in FIG. 22 , a boundary portion 34 is formed on the surface (i.e., outer surface) of the electrode post cover plate 3 away from the receiving cavity 1A, between the second connection portion 104 and the liquid inlet hole 31. It should be noted that the boundary portion 34 is a recessed or protruding structure. If electrolyte spills from the liquid inlet hole 31, the boundary portion 34 can block the electrolyte, for example, by accumulating it in the recessed structure or blocking it with the protruding structure, thereby reducing the possibility of the electrolyte contacting the second connection portion 104 and reducing contamination and corrosion of the second connection portion 104. Furthermore, the provision of the boundary portion 34 can serve as a marker to indicate that the connection position between the bus member 103 and the electrode post cover plate 3 is far from the liquid inlet hole 31, thereby further reducing the possibility of electrolyte spilling from the liquid inlet hole 31 contacting the second connection portion 104. It should be noted that the shape and dimensions of the boundary portion 34 are not limited as long as it can block the liquid inlet hole 31 to a certain extent.

[0213] In a third aspect, embodiments of the present application further provide a power consuming device including the battery 100 of any one of the above aspects.

[0214] According to some embodiments of the present application, the present application further provides a power consuming device including any one of the above-described battery 100, wherein the battery 100 is used to provide electrical energy to the power consuming device. The power consuming device may be any one of the above-described facilities or systems to which the battery 100 is applied. Improved performance of the battery 100 helps to improve the electrical performance of the power consuming device during operation.

[0215] A battery cell 102 according to a specific embodiment of the present invention will now be described.

[0216] 4 to 6, the battery cell 102 includes a casing 1 and a battery core assembly 7. The casing 1 defines a receiving cavity 1A. The casing 1 is provided with a pole body 2. The pole body 2 is covered with a pole cover plate 3. The pole body 2 is formed with a communication passage 2A that communicates with the receiving cavity 1A. The pole cover plate 3 is formed with a liquid inlet 31, and the liquid inlet 31 communicates with the communication passage 2A. The battery core assembly 7 includes an active material application portion 71 and a conductive portion 72. The active material application portion 71 is received in the receiving cavity 1A, and the conductive portion 72 connects the active material application portion 71 and the pole body 2.

[0217] 4 to 6, the pole body 2 is formed with a first accommodating groove 211 and a communication hole 22, the first accommodating groove 211 opens toward the pole cover plate 3 to communicate with the liquid injection hole 31, the communication hole 22 penetrates the groove wall of the first accommodating groove 211 and communicates the first accommodating groove 211 with the accommodating cavity 1A, the conductive part 72 is inserted into at least one communication hole 22 so that at least a portion of the conductive part 72 is accommodated in the first accommodating groove 211, there may be one or more communication holes 22, and at least one communication hole 22 is a liquid permeation hole 23, and the communication passage 2A includes the first accommodating groove 211 and the liquid permeation hole 23.

[0218] 19, the inlet 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 inlet flow direction. The flow area of ​​the first hole section 311 gradually decreases from the first hole section 311 to the second hole section 312. The flow area of ​​the second hole section 312 does not change from the first hole section 311 to the second hole section 312. The flow area of ​​the outlet end of the first hole section 311 is larger than the flow area of ​​the inlet end of the second hole section 312. The battery cell 102 further includes a first seal 4 and a second seal 5. At least a portion of the first seal 4 is fitted into the second hole 312 and is tightly sealed to the second hole 312. The second seal 5 is located outside the first seal 4 and covers the liquid supply end 31a of the liquid filling hole 31. The edge of the second seal 5 is welded and sealed to the pole cover plate 3.

[0219] When manufacturing the battery cell 102, first, the conductive part 72 is inserted into the connecting hole 22 of the pole body 2, and the conductive part 72 is welded to the pole body 2. Next, the pole cover plate 3 is attached to the pole body 2, and electrolyte is poured into the electrode post cover plate 3 through the inlet 31. The electrolyte enters the casing 1 through the connecting passage 2A in the pole body 2. After the electrolyte is poured, the first seal 4 is attached to the inlet 31 to achieve pre-sealing. Next, the second seal 5 is attached to the inlet 31, and the second seal 5 is then welded to the pole cover plate 3 to achieve a tight seal.

[0220] It should be noted that the embodiments and features of the embodiments of the present application can be combined with each other unless there is a contradiction.

[0221] The above is merely a preferred embodiment of the present application, and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application without departing from the spirit and principles of the present application should be included in the scope of the claims of the present application.

Claims

1. a casing defining a receiving cavity; a pole body provided in the casing and having a communication passage formed therein that communicates with the accommodating cavity; a pole cover plate that is attached to the pole body as a cover and has a liquid injection hole that communicates with the communication passage. Battery cell.

2. The communication passage includes a first accommodating groove that is open toward the pole cover plate and communicates with the liquid inlet, and a liquid permeation hole that penetrates a groove wall of the first accommodating groove and communicates between the first accommodating groove and the accommodating cavity. The battery cell according to claim 1 .

3. The battery cell includes a battery core assembly including an active material applied portion accommodated in the accommodating cavity and a conductive portion connected to the active material applied portion, the pole body is formed with a communication hole that communicates the first accommodating groove and the accommodating cavity, the number of the communication hole is one or more, and at least one of the communication hole is the liquid permeable hole, and the conductive portion is inserted into at least one of the communication hole and at least a portion of the conductive portion is accommodated in the first accommodating groove. The battery cell according to claim 2 .

4. the communication hole into which the conductive portion is inserted is a first communication hole, and at least the first communication hole is the liquid passage hole; The battery cell according to claim 3 .

5. the communication hole into which the conductive portion is inserted is a first communication hole, the communication holes are plural, and the communication hole further includes at least one second communication hole into which the conductive portion is not inserted, and at least the second communication hole is the liquid permeation hole; The battery cell according to claim 3 .

6. a groove opening of the first accommodating groove is located on a side of the first accommodating groove away from the accommodating cavity, a groove wall of the first accommodating groove on a side close to the accommodating cavity is a groove bottom wall, the conductive portion and the groove bottom wall are connected to form a first connecting portion, and an orthogonal projection of the liquid injection hole onto the groove bottom wall is positioned offset from the first connecting portion; The battery cell according to any one of claims 3 to 5.

7. the communicating hole into which the conductive portion is inserted is a first communicating hole, the pole body is formed in an elongated structure, and the first communicating hole is formed as an elongated hole whose longitudinal direction extends in a direction from one end of the pole body to the other end of the length; The battery cell according to any one of claims 3 to 6.

8. The electrode post cover plate is an elongated cover plate, and the liquid inlet is eccentrically disposed in the longitudinal direction of the electrode post cover plate. The battery cell according to claim 7 .

9. the communicating hole into which the conductive portion is inserted is a first communicating hole, there are a plurality of first communicating holes and a plurality of conductive portions, and at least one conductive portion is inserted into each of the first communicating holes; The battery cell according to any one of claims 3 to 8.

10. The battery cell includes a battery core assembly including an active material coated portion housed in the housing cavity and a conductive portion connected to the active material coated portion, and the conductive portion is connected to a wall surface of the pole body on a side facing the housing cavity. The battery cell according to claim 2 .

11. The communication passage further includes a second accommodating groove, the second accommodating groove being located on a side of the first accommodating groove that is closer to the accommodating cavity, the second accommodating groove being open toward the accommodating cavity and communicating with the accommodating cavity, and the liquid permeation hole penetrating a groove wall of the second accommodating groove to communicate with the first accommodating groove and the second accommodating groove. The battery cell according to any one of claims 2 to 10.

12. the liquid inlet hole is disposed opposite the liquid passage hole; The battery cell according to any one of claims 2 to 11.

13. At least a portion of the pole cover plate is fitted into the first receiving groove. The battery cell according to any one of claims 2 to 12.

14. The edge of the pole cover plate has an overlapping portion that overlaps the pole body on the side away from the receiving cavity. The battery cell according to any one of claims 1 to 13.

15. an edge of the pole cover plate has an overlapping portion, and a surface of the pole body on the side away from the receiving cavity has a notched groove surrounding the first receiving groove, and at least a part of the overlapping portion is fitted into the notched groove; The battery cell according to any one of claims 2 to 13.

16. a fitting gap is formed between the overlapping portion and a side wall of the notched groove, and the dimension of one end of the fitting gap away from the accommodating cavity is less than 0.05 mm; The battery cell of claim 15.

17. The injection hole is located on a cathode pole cover plate, and the cathode pole cover plate and the cathode pole body are made of the same material; The battery cell according to any one of claims 1 to 16.

18. The pole cover plate includes a first cover plate portion and a second cover plate portion, the first cover plate portion is connected to the pole body, the first cover plate portion and the pole body are made of the same material, the second cover plate portion is connected to the first cover plate portion, and the liquid inlet is located on the first cover plate portion or the second cover plate portion. The battery cell according to any one of claims 1 to 16.

19. a flow area of ​​the liquid supply end of the liquid inlet is larger than a flow area of ​​the liquid discharge end of the liquid inlet; The battery cell according to any one of claims 1 to 18.

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

21. the inlet hole is composed of the first hole section and the second hole section, the flow area of ​​the first hole section gradually decreases along the direction from the first hole section to the second hole section, and the flow area of ​​the outlet end of the first hole section is equal to the flow area of ​​the inlet end of the second hole section; 21. The battery cell of claim 20.

22. The inlet hole further includes a third step, which is located between the first step and the second step along the inlet flow direction, the flow area of ​​the third step gradually decreases along the direction from the first step to the second step, the flow area of ​​the inlet end of the third step is equal to or less than the flow area of ​​the outlet end of the first step, and the flow area of ​​the outlet end of the third step is equal to the flow area of ​​the inlet end of the second step.

21. The battery cell of claim 20.

23. a seal structure fitted to the pole cover plate and sealing the liquid injection hole; The battery cell according to any one of claims 1 to 19.

24. The sealing structure includes: a first seal member at least a portion of which is fitted into the liquid inlet and is press-fitted into the liquid inlet to seal the liquid inlet; 24. The battery cell of claim 23.

25. The sealing structure includes: a second seal member provided to cover the liquid supply end of the liquid inlet and sealed to the pole cover plate; 24. The battery cell of claim 23.

26. The liquid inlet includes a first hole section and a second hole section arranged in order along a liquid inlet 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 portion of the second seal member is fitted into the first hole section and covers the second hole section.

26. The battery cell of claim 25.

27. an edge of the second seal member sealingly connected to the wall of the first hole section; 27. The battery cell of claim 26.

28. the second seal member includes an extension portion that extends to an exterior of the first hole section and is superimposed on and sealed to a wall surface of the pole post cover plate on a side away from the receiving cavity.

27. The battery cell of claim 26.

29. the liquid inlet forms a stepped surface at a connection between the first hole step and the second hole step, and a portion of the second seal member fitted into the first hole step is supported by the stepped surface; The battery cell according to any one of claims 26 to 28.

30. The sealing structure includes: a first seal member that is tightly fitted to the second bore step and is located on a side of the second seal member that is adjacent to the receiving cavity; The battery cell according to any one of claims 26 to 29.

31. the second seal member includes a recessed portion that protrudes in a direction away from the first seal member, a recessed cavity is formed on a side of the recessed portion that faces the first seal member, and a portion of the first seal member extends into the recessed cavity.

31. The battery cell of claim 30.

32. the second seal member includes a central portion and an edge portion surrounding the central portion, the central portion being fitted into the liquid injection hole, and the edge portion being superposed on and sealed to a portion surrounding the liquid injection hole on a wall surface of the pole cover plate on a side away from the accommodating cavity.

26. The battery cell of claim 25.

33. The casing includes a first casing wall, the pole body is provided on the first casing wall, the first casing wall is an integrally formed cover plate, or the first casing wall and at least one second casing wall are integrally formed, and the second casing wall extends toward one side in the thickness direction of the first casing wall. The battery cell according to any one of claims 1 to 32.

34. A bus member and a plurality of battery cells according to any one of claims 1 to 33, wherein at least two of the battery cells are electrically connected by the bus member. Battery.

35. The bus member is connected to the surface of the pole cover plate on the side away from the accommodation cavity to form a second connection portion, and the liquid injection hole is installed offset from the second connection portion. The battery according to claim 34.

36. On the surface of the pole cover plate on the side away from the accommodation cavity, a boundary portion is formed between the second connection portion and the liquid injection hole. The battery according to claim 35.

37. Including the battery according to any one of claims 34 to 36. [[ID=

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