Battery cells, batteries and electrical devices

Abstract

This application relates to a battery cell, a battery, and an electrical device, and belongs to the art of batteries. The battery cell comprises a case and an electrode body, the case defining a housing cavity, the electrode body being provided in the case, the electrode body having an injection passage for communicating the housing cavity with the outside of the case, the injection passage including a housing groove and a through hole penetrating the groove wall of the housing groove.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application is filed based on a Chinese patent application with application number 202311070663.6 and filing date August 23, 2023, claims the priority of the above - mentioned Chinese patent application, and all the contents of the above - mentioned Chinese patent application are incorporated into this application by reference.

[0002] This application relates to the technical field of batteries, and in particular, to battery cells, batteries, and electrical devices.

Background Art

[0003] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. Here, the power battery includes a plurality of battery cells, but the battery cells still have room for improvement in terms of usage performance and manufacturability.

Summary of the Invention

[0004] The embodiments of this application provide a battery cell, a battery, and an electrical device that can improve the usage performance and manufacturability of the battery cell.

[0005] In a first aspect, the embodiments of this application provide a battery cell comprising a case defining an accommodation cavity, and a pole body provided on the case, in which a liquid injection passage for communicating the accommodation cavity with the outside of the case is formed, and the liquid injection passage includes a receiving groove and a through - hole penetrating the groove wall of the receiving groove.

[0006] In the above technical solution, an electrolyte injection passage is provided in the electrode column body, allowing electrolyte to be injected into the housing cavity. This eliminates the need to separately create an electrolyte injection passage in the battery cell case. Therefore, the electrolyte injection passage does not occupy additional space in the case, and the electrode column body does not need to be reduced in size to avoid the passage. As a result, the area of ​​the electrode column body and the flow path area can be increased without increasing the size of the case, which is advantageous for reducing flow resistance and improving the current flow efficiency of the battery cell. The increased area of ​​the electrode column body is also advantageous for mounting and connecting the electrode column body to the case. Furthermore, since the case size does not need to be increased to increase the area of ​​the electrode column body, it is advantageous for achieving miniaturization and weight reduction of the case. In addition, since there is no need to perform special processing on the case to separately create an electrolyte injection passage in the battery cell case, it is advantageous for reducing the complexity of the case structure and the difficulty of processing. Furthermore, since it is not necessary to thicken a part of the case in order to weld sealing nails to the case, the structure and processing of the case can be further simplified, and since it is not necessary to thicken the entire case in order to weld sealing nails to the case, it is advantageous in meeting the requirements for lightweight and thin-walled cases, which is advantageous in improving the energy density of the battery cells, and is advantageous in reducing the weight and material cost of the case. In addition, since the liquid injection passage is provided in the pole column body, the manufacturing and processing of the liquid injection passage can be made easier, the size and shape of the liquid injection passage can easily meet the design requirements and application needs, which is advantageous in reducing the difficulty of processing the liquid injection passage and reducing the processing cost of the liquid injection passage. In addition, since the liquid injection passage includes a housing groove and a through hole that penetrates the groove wall of the housing groove, the housing cavity and the outside of the case can communicate through the liquid injection passage, enabling liquid injection. Since the liquid injection passage includes a housing groove, the temporary storage space is large and can serve to some extent to temporarily store the electrolyte, which is advantageous in reducing the possibility of electrolyte splashing or spilling during liquid injection or operation of the battery cell.

[0007] In some embodiments, the accommodating groove includes a first accommodating groove having a groove opening that opens away from the accommodating cavity, and the through-hole includes a liquid passage hole that penetrates the groove wall on the side of the first accommodating groove closer to the accommodating cavity.

[0008] In the above technical solution, the first containment groove can serve as a temporary storage space for the electrolyte, improving problems such as electrolyte splashing and overflowing. Furthermore, the side walls of the first containment groove can block electrolyte splashing to some extent, reducing external contamination by the electrolyte and facilitating rapid injection. In addition, the injection nozzle can be flexibly configured; for example, the outlet of the injection nozzle can be enlarged to fit the groove opening of the first containment groove, which is advantageous for further improving injection efficiency.

[0009] In some embodiments, the receiving groove further includes a second receiving groove having a groove opening that opens toward the receiving cavity, the second receiving groove being located on the side of the first receiving groove closer to the receiving cavity, and a liquid passage hole passing through the groove wall on the side of the second receiving groove away from the receiving cavity, thereby connecting the first receiving groove and the second receiving groove.

[0010] In the above technical solution, the provision of a second containment groove allows gas generated in the containment cavity or electrolyte that is about to overflow to enter the second containment groove, and the second containment groove can serve as temporary storage, thereby improving the operational reliability of the battery cell. Furthermore, the provision of a second containment groove allows the height of the liquid passage hole during injection to be increased, and when the injection height of the electrolyte coincides with the lower end of the liquid passage hole, it is advantageous for increasing the total amount of electrolyte injected and improving the cycle life of the battery cell.

[0011] In some embodiments, the battery cell comprises a cell assembly including an active material coated portion housed in a housing cavity and a conductive portion connected to the active material coated portion, wherein the pole body has a communication hole that connects a first housing groove and a housing cavity, and there is one or more communication holes, at least one of which is a liquid passage hole, and the conductive portion is inserted through at least one communication hole such that at least a portion of it is housed in the first housing groove.

[0012] In the above technical solution, at least a portion of the conductive portion is housed in the first housing groove, so that at least a portion of the conductive portion occupies the space within the first housing groove. As a result, the space occupied by the conductive portion within the housing cavity is reduced, saving space within the housing cavity, allowing for the accommodation of a larger volume of active material coated portion, which is advantageous for improving the energy density of the battery cell, or, if the energy density of the battery cell is constant, is advantageous for reducing the size of the battery cell.

[0013] In some embodiments, the communication hole through which the conductive part is inserted is the first communication hole, and the first communication hole is a liquid passage hole.

[0014] In the above technical solution, if at least the first communication hole is a liquid passage hole, the first communication hole also has a liquid passage function, that is, the first communication hole can be used to allow the electrolyte to pass through after the conductive part has been inserted. In this case, the electrolyte can be passed through at least the first communication hole, and it is possible to choose whether or not to provide a communication hole through which the conductive part is not inserted as needed, which is advantageous in reducing the total number of communication holes, simplifies the structure and processing of the pole column body, and improves the structural strength of the pole column body.

[0015] In some embodiments, the communication hole through which the conductive part is inserted is the first communication hole, and there are multiple communication holes, further including at least one second communication hole through which the conductive part is not inserted, and at least the second communication hole is a liquid passage hole.

[0016] In the above technical solution, if at least the second connecting hole is a liquid passage hole, the electrolyte can be passed through at least the second connecting hole. In this case, it is not necessary to increase the diameter or number of the first connecting hole in order to allow the electrolyte to pass through the first connecting hole, nor is it necessary to reduce the size of the conductive part in order to allow the electrolyte to pass through the first connecting hole. It is sufficient to design the size of the first connecting hole to be slightly larger than the size of the conductive part in order to allow the conductive part to pass through. This improves the problem of impurities falling into the housing cavity through the gap between the conductive part and the first connecting hole, improves the problem of reduced local strength of the pole body due to the size of the first connecting hole being too large, and allows for a relatively large size of the conductive part, which is advantageous for improving current passage efficiency. In addition, since the electrolyte is not affected by the conductive part when passing through the second connecting hole, the liquid injection efficiency can be improved, and the possibility of the electrolyte causing problems such as contamination or corrosion of the conductive part is also reduced.

[0017] In some embodiments, the pole column body is formed as an elongated structure, and the communication hole through which the conductive part is inserted is formed as an elongated hole whose length direction extends from one end to the other of the pole column body.

[0018] In the above technical solution, the length of the communication hole through which the conductive part is inserted can be made as long as possible by making full use of the space in the pole column body, and a larger size conductive part can be inserted into the communication hole through which the conductive part is inserted, which is advantageous for increasing the size of the conductive part and improving the current flow efficiency. If the communication hole through which the conductive part is inserted is a liquid passage hole, increasing the length of the communication hole through which the conductive part is inserted is also advantageous for improving the liquid injection efficiency.

[0019] In some embodiments, the battery cell comprises a cell assembly including an active material coated portion housed in a housing cavity and a conductive portion connected to the active material coated portion. The pole body has a communication hole formed therein that connects a first housing groove and the housing cavity, and there is one or more communication holes, at least one of which is a liquid passage hole. The conductive portion is connected to the wall surface of the pole body facing the housing cavity.

[0020] In the above technical solution, since the conductive part is connected to the wall surface of the pole column body facing the housing cavity, the conductive part is not inserted into the communication hole and does not enter the first housing groove. Therefore, contamination and corrosion of the connection part formed by the connection between the conductive part and the pole column body by the injected electrolyte can be reduced.

[0021] In some embodiments, the pole column body is formed as an elongated structure, and the first receiving groove is formed as an elongated groove whose length direction extends from one end to the other of the pole column body.

[0022] In the above technical solution, the size of the first housing groove is increased by making full use of the space in the pole column body, which is advantageous for improving liquid injection efficiency. Furthermore, the design of the liquid injection nozzle with an enlarged diameter is facilitated, such as setting the outlet end of the liquid injection nozzle to fit the groove opening of the first housing groove, which is advantageous for further improving liquid injection efficiency.

[0023] In some embodiments, the groove opening of the first receiving groove is enlarged in diameter.

[0024] In the above technical solution, the fitting of the first housing groove and the liquid injection nozzle becomes easier, the liquid injection nozzle can easily enter the groove opening of the first housing groove, it acts as a positional restraint for the liquid injection nozzle, improves the fitting stability between the liquid injection nozzle and the groove opening of the first housing groove, and reduces the possibility of leakage during liquid injection.

[0025] In some embodiments, the battery cell further comprises a pole column cover plate that covers the pole column body and seals the groove opening of the first housing groove.

[0026] In the above technical solution, after liquid injection, a pole cover plate is provided to cover the pole body, and the groove opening of the first receiving groove in the pole body can be sealed by the pole cover plate. As a result, the liquid injection passage is in a sealed state, preventing the overflow of the electrolyte and the intrusion of external foreign objects into the battery cell, and improving the reliability of the battery cell.

[0027] In some embodiments, at least a part of the pole cover plate is fitted into the first receiving groove.

[0028] In the above technical solution, by fitting at least a part of the pole cover plate into the first receiving groove, the space occupied by the pole cover plate outside the pole body can be reduced, and the compactness of the structure can be improved.

[0029] In some embodiments, the edge of the pole cover plate has a lapped joint portion that is lapped and joined on the side away from the receiving cavity of the pole body.

[0030] In the above technical solution, the fitting and connection between the pole cover plate and the pole body are facilitated. Also, the lapped joint portion is welded to the pole body. When the pole body has a liquid passage hole, the lapped joint portion can be away from the liquid passage hole. When the electrolyte overflows from the liquid passage hole, the electrolyte can move away from the welding location between the lapped joint portion and the pole body, improving problems such as corrosion and contamination of this welding location.

[0031] In some embodiments, the pole body has a countersunk groove provided on the surface on the side away from the receiving cavity so as to surround the first receiving groove, and at least a part of the lapped joint portion is fitted into the countersunk groove.

[0032] In the above technical solution, the positioning role of the counterbore groove improves the mounting efficiency between the pole column body and the pole column cover plate. Furthermore, the positional restriction role of the counterbore groove improves the stability and reliability of the fitting between the pole column body and the pole column cover plate. In addition, the presence of the counterbore groove allows the pole column cover plate to be fitted further into the pole column body, resulting in the pole column cover plate protruding slightly from or not protruding at all from the pole column body, which is advantageous in reducing the space occupied outside the pole column body.

[0033] In some embodiments, there is a fitting gap between the overlapping joint and the side wall of the counterbore groove, and the size W of one end of the fitting gap away from the housing cavity is less than 0.05 mm.

[0034] In the above technical solution, the overlapping joint of the pole column cover plate can be smoothly fitted into the counterbore groove of the pole column body, while the fitting gap between the two does not become too large. When the overlapping joint and the pole column body are connected by welding, the welding yield between the overlapping joint and the pole column body can be improved.

[0035] In some embodiments, the battery cell further comprises a first sealing structure that seals the liquid passage holes.

[0036] In the above-described technical solution, by providing a first sealing structure for sealing the liquid passage, the liquid injection passage is sealed, preventing the electrolyte from overflowing and preventing external foreign matter from entering the battery cell, thereby improving the reliability of the battery cell.

[0037] In some embodiments, the accommodating groove includes a third accommodating groove having a groove opening that opens toward the accommodating cavity, and the through hole includes an injection hole that penetrates the groove wall on the side of the third accommodating groove away from the accommodating cavity.

[0038] In the above technical solution, the third storage groove can serve as a temporary storage for the electrolyte, and the side walls of the third storage groove can block the scattering of the electrolyte, facilitating rapid injection. Furthermore, the height of the injection hole can be increased, and if the injection hole is blocked, gas or electrolyte generated in the storage cavity can enter the third storage groove, allowing the third storage groove to serve as a temporary storage, thereby improving the operational reliability of the battery cell. Additionally, if the electrolyte injection height coincides with the lower end of the injection hole, the presence of the third storage groove below the injection hole allows for a higher electrolyte injection height, which is advantageous for increasing the total amount of electrolyte injected and, consequently, improving the cycle life of the battery cell.

[0039] In some embodiments, the flow path area at the liquid inlet end of the injection hole is larger than the flow path area at the liquid outlet end of the injection hole.

[0040] In the above technical solution, when the electrolyte is injected into the injection hole, it flows from the liquid inlet end to the liquid outlet end. By making the flow path area at the liquid inlet end of the injection hole larger than the flow path area at the liquid outlet end of the injection hole, it is advantageous to improve the injection efficiency and alleviate the problem of electrolyte overflow. Furthermore, when the injection hole and the injection nozzle are fitted together, the relatively large flow path area at the liquid inlet end of the injection hole makes it easier to insert the injection nozzle into the injection hole, which is advantageous to improve the injection efficiency.

[0041] In some embodiments, the battery cell further comprises a second sealing structure that seals the injection hole.

[0042] In the above technical solution, the provision of a second sealing structure for sealing the injection hole ensures that the liquid injection passage is sealed, preventing electrolyte overflow and preventing external foreign matter from entering the battery cell, thereby improving the reliability of the battery cell. Furthermore, if the flow path area at the liquid inlet end of the injection hole is larger than the flow path area at the liquid outlet end of the injection hole, the second sealing structure can be quickly attached to the injection hole.

[0043] In some embodiments, the battery cell comprises a cell assembly including an active material coated portion housed in a housing cavity and a conductive portion connected to the active material coated portion, wherein at least a portion of the conductive portion is housed in a third housing groove and connected to the groove wall on the side of the third housing groove away from the housing cavity.

[0044] In the above technical solution, at least a portion of the conductive part can be housed in the third housing groove, thereby reducing the space occupied by the conductive part within the housing cavity, saving space within the housing cavity, and allowing for the housing of a larger volume of active material coated part. This is advantageous for improving the energy density of the battery cell, or, if the energy density of the battery cell is constant, for reducing the size of the battery cell.

[0045] In some embodiments, the case includes a first case wall, the pole column body is provided on the first case wall, and the first case wall is either a lid plate integrally molded or integrally molded with at least one second case wall extending toward one side in the thickness direction of the first case wall.

[0046] In the above technical solution, flexible design of the pole body position can be achieved, thereby expanding the range of application for battery cells.

[0047] In a second embodiment, the embodiment of the present application further provides a battery comprising a current collector and battery cells of any of the above-described solutions, wherein there are multiple battery cells, at least two of which are electrically connected via the current collector.

[0048] In the above-described technical solution, the performance and manufacturability of the battery cell according to the embodiment of this application are improved, which is advantageous for improving the performance and manufacturability of the battery.

[0049] In a third aspect, embodiments of the present application further provide an electrical device comprising a battery according to any of the above-described solutions.

[0050] In the above-described technical solution, the performance of the battery is improved, which is advantageous for improving the operating power performance of electrical devices. [Brief explanation of the drawing]

[0051] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments are briefly described below. It should be understood that the following drawings are merely illustrations of some embodiments of this application and should not be considered limiting in scope. Those skilled in the art can conceive of other drawings based on these drawings without any creative effort.

[0052] [Figure 1] This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. [Figure 2] This is an exploded view of the structure of a battery provided in some embodiments of this application. [Figure 3] This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. [Figure 4] Figure 3 is a schematic orthographic projection of a battery cell after one of its pole plate covers has been opened. [Figure 5] Figure 4 is a cross-sectional view along the NN line. [Figure 6] Partial enlarged view of Figure 5 [Figure 7] This is a cross-sectional view of a battery cell provided in some embodiments of this application. [Figure 8] This is a schematic diagram of the fitting between the pole body and the conductive part provided in some embodiments of this application. [Figure 9] Figure 8 is a cross-sectional view along the PP line. [Figure 10] This is a schematic diagram of the fitting between the pole body and the conductive part provided in some embodiments of this application. [Figure 11] Figure 10 shows a cross-sectional view along the QQ line. [Figure 12] Figure 10 is a cross-sectional view along the RR line. [Figure 13] This is a schematic diagram of the fitting between the pole column body and the pole column cover plate provided in some embodiments of this application. [Figure 14] Figure 13 is a cross-sectional view along the SS line. [Figure 15] This is a cross-sectional view along the TT line in Figure 14. [Figure 16] This is a cross-sectional view of a battery cell provided in some embodiments of this application. [Figure 17] This is a cross-sectional view of a battery cell provided in some embodiments of this application. [Figure 18] This is a cross-sectional view of a battery cell provided in some embodiments of this application. [Figure 19] This is a partial cross-sectional view of the pole column body provided in some embodiments of this application. [Figure 20] Figure 19 is a cross-sectional view of the fitting between the pole column body and the second sealing member. [Figure 21] Figure 19 is a cross-sectional view showing the fitting of the pole column body with the first sealing member and the second sealing member. [Figure 22] Figure 19 is a cross-sectional view showing the fitting of the pole column body with the first sealing member and the second sealing member. [Figure 23] This is a partial cross-sectional view of the pole column body provided in some embodiments of this application. [Figure 24] This is a partial cross-sectional view of the pole column body provided in some embodiments of this application. [Figure 25] This is a cross-sectional view of a battery cell provided in some embodiments of this application. [Figure 26] This is a schematic diagram of the fitting between a battery cell and a current collector provided in some embodiments of this application. [Modes for carrying out the invention]

[0053] To further clarify the purpose, technical solution, and advantages of the embodiments of this application, the technical solution of the embodiments of this application will be clearly described below with reference to the drawings of the embodiments. Naturally, the embodiments described are only a part of the embodiments of this application, not all of them. Any other embodiments that can be obtained by a person skilled in the art without creative work based on the embodiments of this application shall all fall within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as generally understood by those skilled in the art. Terms used in the specification of this application are for illustrative purposes only and are not intended to limit this application. The terms “includes,” “has,” and any variations thereof in the specification, claims, and brief description of the drawings above are intended to cover non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification, claims, or drawings above are for distinguishing different subjects and are not intended to describe a particular order or primary-secondary relationship.

[0055] Where the term "Examples" is described in this application, it means that the specific features, structures, or properties described by the Examples may be included in at least one Example of this application. The term "Examples" appearing in different parts of the specification does not necessarily refer to the same Example, nor does it refer to an Example that is exclusively independent or alternative to another Example.

[0056] In the description of this application, unless otherwise explicitly defined or limited, the terms “attach,” “connect,” and “join” should be understood in a broad sense. For example, connections may be fixed, detachably connected, or integrally connected. Connections may be direct or indirectly connected via an intermediate medium. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0057] In this application, the term "and / or" is merely used to describe the relationship between related objects, and indicates that there may be three such relationships. For example, A and / or B can represent the cases where A exists alone, where A and B exist simultaneously, or where B exists alone. In addition, the symbol " / " in this application generally indicates that the preceding and following related objects are in an "or" relationship.

[0058] In the embodiments of this application, the same reference numerals indicate the same component, and for the sake of simplicity, detailed descriptions of the same component are omitted in different embodiments. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of this application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are for illustrative purposes only and do not constitute limitations of this application.

[0059] As used in this application, "multiple" means two or more (including two).

[0060] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and is not limited to these in the embodiments of this application. The battery cell may be cylindrical, flattened, rectangular, or have other shapes, and is not limited to these in the embodiments of this application. Generally, battery cells are classified into three types according to the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack type battery cells, and is not limited to these in the embodiments of this application.

[0061] The battery described in the embodiments of this application is a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery described in this application may include a battery module or a battery pack. A battery module generally contains multiple battery cells. A battery pack generally includes a box for packaging one or more battery cells or one or more battery modules. The box prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0062] A battery cell comprises a case, a cell assembly, and an electrolyte, the case being for housing the cell assembly and the electrolyte. The cell assembly includes at least one electrode assembly, the electrode assembly consisting of a positive electrode sheet, a negative electrode sheet, and a separator, and the electrode assembly may have a wound structure, a laminated structure, or the like. The battery cell operates mainly by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0063] The positive electrode sheet may generally include a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is applied directly or indirectly to the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer applied, forming a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0064] The negative electrode sheet may generally include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is applied directly or indirectly to the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer applied, forming 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.

[0065] To prevent melting when a large current flows, the positive electrode tabs are multiple and stacked to form the positive electrode tab portion, and the negative electrode tabs are also multiple and stacked to form the negative electrode tab portion. Electrode columns are provided in the case, and the positive electrode tab portion is electrically connected to the positive electrode column, while the negative electrode tab portion is electrically connected to the negative electrode column. For example, a direct electrical connection between the tab portion and the electrode column can be formed by welding the tab portion to the electrode column. Alternatively, for example, the cell assembly may include a relay sheet, and an indirect electrical connection between the tab portion and the electrode column can be formed by welding the tab portion to the relay sheet and the relay sheet to the electrode column.

[0066] The material of the separator is not limited and may be, for example, polypropylene or polyethylene.

[0067] In battery cells using related technologies, the top cover of the case is typically equipped with electrode posts and explosion-proof valves, as well as an electrolyte injection port, which is spaced apart from the electrode posts and explosion-proof valves. Because the electrolyte injection port is provided separately on the top cover and occupies an area of ​​the top cover, the area of ​​the electrode posts becomes smaller. If it is necessary to increase the area of ​​the electrode posts, the size of the top cover must be increased, and the weight of the larger top cover also increases, making it difficult to miniaturize and lighten the top cover. In addition, because the electrolyte injection port needs to be machined separately on the top cover, the structure of the top cover becomes relatively complex, increasing the difficulty of machining and making it difficult to machine the electrolyte injection port. Furthermore, considering airtightness, it is necessary to weld sealing nails to the top cover to seal the electrolyte injection port. However, as the energy density of battery cells increases, the top cover is becoming thinner, and the top cover is more prone to collapse or melt-through problems at the welding points of the sealing nails. To address this problem, it is common practice to thicken the welded portion of the sealing nails on the top cover. This results in increased material and manufacturing costs for the top cover, or necessitates thickening the entire top cover, which would fail to meet the requirement for a lightweight, thin top cover and would negatively impact the improvement of the battery cell's energy density.

[0068] Therefore, the embodiment of this application provides a battery cell comprising a case defining a housing cavity, and a pole column body provided in the case, which has an injection passage formed therein for communicating the housing cavity with the outside of the case, and the injection passage includes a housing groove and a through hole that penetrates the groove wall of the housing groove. As a result, since the injection passage includes a housing groove and a through hole that penetrates the groove wall of the housing groove, the housing cavity and the outside of the case can communicate via the injection passage, enabling injection of electrolyte. Since the injection passage includes a housing groove, the temporary storage space is large and can serve to some extent to temporarily store the electrolyte, which is advantageous in reducing the possibility of electrolyte splashing or spilling during injection or operation of the battery cell.

[0069] Furthermore, since an electrolyte injection passage is provided in the electrode column body, allowing electrolyte to be injected into the housing cavity, it becomes possible to inject electrolyte from the electrode column body, eliminating the need to separately create an electrolyte injection passage in the battery cell case. Therefore, the electrolyte injection passage does not occupy additional space in the case, and the electrode column body does not need to be reduced in size to avoid the electrolyte injection passage. As a result, the area of ​​the electrode column body and the flow path area can be increased without increasing the size of the case, which is advantageous for reducing flow resistance and improving the current flow efficiency of the battery cell. The increased area of ​​the electrode column body is also advantageous for mounting and connecting the electrode column body to the case. In addition, since it is not necessary to increase the size of the case to increase the area of ​​the electrode column body, it is advantageous for achieving miniaturization and weight reduction of the case. Furthermore, it is advantageous for processing and molding the electrolyte injection passage, as well as for simplifying the structure and processing of the case. Furthermore, since it is not necessary to thicken a part of the case in order to weld sealing nails to the case, the structure and processing of the case can be further simplified. Also, since it is not necessary to thicken the entire case in order to weld sealing nails to the case, it is advantageous in meeting the requirements for a lightweight and thin case, which is advantageous in improving the energy density of the battery cell, and is also advantageous in reducing the weight and material cost of the case.

[0070] Embodiments of this application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, tablet, laptop computer, electric toy, power tool, electric motorcycle, electric car, ship, aircraft, etc. Here, electric toys may include, for example, fixed or mobile electric toys such as game consoles, electric car toys, electric boat toys and electric airplane toys, and aircraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0071] In the following embodiments, for the sake of clarity, the electrical device of one embodiment of this application will be described as a vehicle 1000.

[0072] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application, the vehicle 1000 may be a fuel cell vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, and for example, the battery 100 can be the operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 for controlling the battery 100 to supply power to the motor 300, and is used, for example, to meet the operating power requirements for starting, navigation, and driving the vehicle 1000.

[0073] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000 as a drive power source for the vehicle 1000, either by substituting or partially substituting gasoline or natural gas.

[0074] Referring to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of this application, the battery 100 comprises a box 101 and battery cells 102 housed in the box 101. Here, the box 101 is for providing a mounting space for the battery cells 102 and can employ various structures. In some embodiments, the box 101 may include a first box body 1011 and a second box body 1012, the first box body 1011 and the second box body 1012 being superimposed, and the first box body 1011 and the second box body 1012 defining a mounting space for housing the battery cells 102. The second box body 1012 may be a hollow structure with one end open, and the first box body 1011 may be a plate-like structure. By overlapping the open side of the first box body 1011 with the open side of the second box body 1012, the first box body 1011 and the second box body 1012 together define a mounting space. Both the first box body 1011 and the second box body 1012 have a hollow structure with one side open, and the open side of the first box body 1011 may overlap the open side of the second box body 1012. Of course, the box 101 formed by the first box body 1011 and the second box body 1012 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0075] In the battery 100, the multiple battery cells 102 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that among the multiple battery cells 102, some are connected in series and others are connected in parallel. The multiple battery cells 102 may be directly connected in series, in parallel, or in a mixed connection, and then the integrated multiple battery cells 102 may be housed in a box 101. Of course, the battery 100 may also be formed by first connecting multiple battery cells 102 in series, in parallel, or in a mixed connection to form a battery module, and then further integrating the multiple battery modules by connecting them in series, in parallel, or in a mixed connection, and then housing them in a box 101. The battery 100 may further include other structures; for example, the battery 100 may further include a current collector for realizing electrical connections between the multiple battery cells 102.

[0076] Here, each battery cell 102 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 102 may be cylindrical, flattened, a rectangular parallelepiped, etc. For example, referring to the embodiment shown in Figure 3, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, the height direction of the battery cell 102 is the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0077] According to some embodiments of this application, referring to Figures 4 to 6, the battery cell 102 comprises a case 1 and a pole body 2, the case 1 defining a housing cavity 1A, the pole body 2 being provided in the case 1, the pole body 2 having a liquid injection passage 2B for communicating the housing cavity 1A with the outside of the case 1, the liquid injection passage 2B including a housing groove 21 and a through hole 28 penetrating the groove wall of the housing groove 21.

[0078] For example, case 1 includes a first case wall 11, the side of the first case wall 11 facing the housing cavity 1A is the inside, and the side of the first case wall 11 away from the housing cavity 1A is the outside, the pole column body 2 is provided on the first case wall 11, and the pole column body 2 has a liquid injection passage 2B that connects the inside and the outside, the liquid injection passage 2B includes a housing groove 21 and a through hole 28 that penetrates the groove wall of the housing groove 21. This allows the liquid injection passage 2B to connect the inside and the outside, enabling liquid injection.

[0079] For example, if the groove opening of the housing groove 21 opens outward (i.e., the groove opening of the housing groove 21 is located on the side away from the housing cavity 1A of the housing groove 21), the housing groove 21 can communicate with the outside. In this case, the through hole 28 can communicate with the inside by penetrating the groove wall on the side closer to the inside of the housing groove 21, so as to enable communication between the inside and outside of the liquid injection passage 2B.

[0080] It can be understood that when the electrolyte is injected into the battery cell 102, the injection passage 2B can be made to communicate between the inside and outside, and after the injection is complete, the injection passage 2B can be sealed so that the inside and outside are no longer communicating, thereby preventing leakage of the electrolyte from the injection passage 2B.

[0081] It should be noted that the position of the pole body 2 within case 1 is not limited. For example, if it is necessary to inject electrolyte into the battery cell 102, the battery cell 102 can be positioned such that the first case wall 11 is located at the top of case 1. In this case, both the pole body 2 and the electrolyte injection passage 2B within the pole body 2 are located at the top of case 1. When the electrolyte is injected into the housing cavity 1A via the electrolyte injection passage 2B, the electrolyte passes downward through the electrolyte injection passage 2B and then flows downward into the housing cavity 1A. This improves the convenience of injection and reduces the possibility of electrolyte overflow or splashing. When the battery cell 102 is in operation, the electrolyte injection passage 2B can be sealed. In this case, case 1 can be positioned such that the first case 1 is located at any position within case 1. For example, when the battery cell 102 is in operation, the first case wall 11 can be located at the top, bottom, side, etc., of case 1.

[0082] It should be explained that the cross-section of the through-hole 28 may be circular, but is not limited to a circular shape; it may also be other shapes such as polygons, ellipses, or oblongs. Furthermore, if the through-hole 28 is multi-stage, each stage may have a circular cross-section, or at least one stage may have a non-circular cross-section.

[0083] According to the embodiment of the battery cell 102 of this application, an electrolyte injection passage 2B is provided in the electrode column body 2, allowing electrolyte to be injected into the housing cavity 1A. This eliminates the need to separately create an electrolyte injection passage 2B in the case 1 of the battery cell 102. Therefore, the electrolyte injection passage 2B does not occupy additional space in the case 1, and the electrode column body 2 does not need to be reduced in size to avoid the electrolyte injection passage 2B. As a result, the area of ​​the electrode column body 2 and the flow path area can be increased without increasing the size of the case 1, which is advantageous for reducing flow path resistance and improving the current flow efficiency of the battery cell 102. The increased area of ​​the electrode column body 2 is also advantageous for mounting and connecting the electrode column body 2 and the case 1. Furthermore, since it is not necessary to increase the size of the case 1 to increase the area of ​​the electrode column body 2, it is advantageous for miniaturizing and reducing the weight of the case 1.

[0084] Furthermore, since there is no need to perform special processing on the case 1 of the battery cell 102 in order to separately open the liquid injection passage 2B in the case 1, it is advantageous in reducing the complexity of the case 1 structure and the difficulty of processing. In addition, since there is no need to thicken a part of the case 1 in order to weld the sealing nails to the case 1, the structure and processing of the case 1 can be further simplified, and since there is no need to thicken the entire case 1 in order to weld the sealing nails to the case 1, it is advantageous in meeting the requirement for a lightweight and thin case 1, which is advantageous in improving the energy density of the battery cell 102, and is advantageous in reducing the weight and material cost of the case 1.

[0085] Furthermore, by providing the liquid injection passage 2B in the pole column body 2, the manufacturing and processing of the liquid injection passage 2B can be facilitated, and the size and shape of the liquid injection passage 2B can easily meet design requirements and application needs, which is advantageous in reducing the difficulty of processing the liquid injection passage 2B and reducing the processing cost of the liquid injection passage 2B.

[0086] Furthermore, since the liquid injection passage 2B includes a housing groove 21 and a through hole 28 that penetrates the groove wall of the housing groove 21, the housing cavity 1A and the outside of the case 1 can communicate via the liquid injection passage 2B, enabling liquid injection. Because the liquid injection passage 2B includes a housing groove 21, it has a large temporary storage space and can serve to some extent to temporarily store the electrolyte, which is advantageous in reducing the possibility of electrolyte splashing or spilling during liquid injection or operation of the battery cell 102.

[0087] In some embodiments of this application, as shown in Figure 6, the housing groove 21 includes a first housing groove 211 having a groove opening that opens away from the housing cavity 1A, and the through hole 28 includes a liquid passage hole 23 that penetrates the groove wall of the first housing groove 211 on the side closer to the housing cavity 1A. In this way, when electrolyte is injected into the battery cell 102, the electrolyte injected from the outside of the first case wall 11 is first injected into the first housing groove 211 through the groove opening of the first housing groove 211, and the electrolyte that has entered the first housing groove 211 flows toward the inside of the first case wall 11 through the liquid passage hole 23.

[0088] As a result, the first containment groove 211 can serve as a temporary storage space for the electrolyte, improving problems such as electrolyte splashing and overflowing. In addition, the side walls of the first containment groove 211 (i.e., the groove walls extending from the groove opening of the first containment groove 211 toward the containment cavity 1A) can block electrolyte splashing to some extent, reducing external contamination by the electrolyte and facilitating rapid injection. Furthermore, the injection nozzle can be flexibly configured, for example, by setting the outlet of the injection nozzle to fit the groove opening of the first containment groove 211, thereby enlarging the outlet of the injection nozzle and resulting in further improvement of injection efficiency. Alternatively, in some selective embodiments, the injection nozzle may be directly aligned with the liquid passage hole 23 for injection, but this is not limited to these embodiments.

[0089] In some embodiments of this application, as shown in Figure 7, the accommodating groove 21 further includes a second accommodating groove 212 having a groove opening that opens toward the accommodating cavity 1A, the second accommodating groove 212 being located on the side of the first accommodating groove 211 closer to the accommodating cavity 1A, and the liquid passage hole 23 penetrates the groove wall of the second accommodating groove 212 away from the accommodating cavity 1A, thereby connecting the first accommodating groove 211 and the second accommodating groove 212.

[0090] In other words, the second accommodating groove 212 is located inside the first accommodating groove 211, or the first accommodating groove 211 is located outside the second accommodating groove 212, or the first accommodating groove 211 and the second accommodating groove 212 are arranged sequentially in a direction from outside to inside, and the liquid passage hole 23 is located between the second accommodating groove 212 and the first accommodating groove 211, and penetrates the groove wall of the second accommodating groove 212 and the groove wall of the first accommodating groove 211, respectively, to connect the first accommodating groove 211 and the second accommodating groove 212.

[0091] Thus, when electrolyte is injected into the battery cell 102, the electrolyte injected from the outside of the first case wall 11 is first injected into the first housing groove 211 through the groove opening of the first housing groove 211, the electrolyte that has entered the first housing groove 211 enters the second housing groove 212 through the liquid passage hole 23, and then flows toward the inside of the first case wall 11 through the opening of the second housing groove 212.

[0092] This allows gas generated in the containment cavity 1A or electrolyte that is about to overflow to enter the second containment groove 212, which can serve as temporary storage and improve the operational reliability of the battery cell 102. Specifically, if the electrolyte is about to overflow during the manufacture, transport, or use of the battery cell 102, the overflowing electrolyte can enter the second containment groove 212, which reduces the likelihood of the electrolyte overflowing from the injection passage 2B, which is advantageous in improving the problem of the overflowing electrolyte contaminating components in case 1, and is advantageous in increasing the injection speed during manufacturing, improving the reliability and manufacturability of the battery cell 102. In addition, during the use of the battery cell 102, the electrolyte reacts and generates gas, causing the pressure inside case 1 to rise, and if the pressure exceeds a certain level, it becomes a reliability problem. If gas is generated inside case 1, the extra second containment groove 212 located below the liquid passage hole 23 can serve as temporary storage for the gas, improving the reliability problem due to the pressure rise and improving the reliability of the battery cell 102.

[0093] Furthermore, the provision of the second storage groove 212 allows the height of the liquid passage hole 23 during injection to be increased, and when the electrolyte injection height coincides with the lower end of the liquid passage hole 23, it is advantageous for increasing the total amount of electrolyte injected and improving the cycle life of the battery cell 102. Understandably, during use of the battery cell 102, the amount of electrolyte inside the battery cell 102 decreases due to electrolyte consumption, affecting the lifespan of the battery cell 102. Increasing the total amount of electrolyte injected is advantageous for improving the lifespan of the battery cell 102.

[0094] Furthermore, if the liquid passage hole 23 is blocked by a long sealing nail, because the height of the liquid passage hole 23 is high, the length of the sealing nail protruding from below the liquid passage hole 23 will be shortened, or it will not protrude from below the liquid passage hole 23 at all. As a result, the sealing nail is less likely to interfere with or electrically conduct to the cell assembly 7 below the pole column body 2, eliminating the need to thicken the lower plastic structure below the pole column body 2, which is advantageous for thinning the lower plastic structure and reducing material costs, as well as reducing the space occupied by the lower plastic structure within the housing cavity 1A, which is advantageous for improving the energy density of the battery cell 102.

[0095] In some embodiments of this application, the cross-sectional shape of the first storage groove 211 and / or the second storage groove 212 conforms to the cross-sectional shape of the pole column body 2. This makes it possible to maximize the size of the first storage groove 211 and / or the second storage groove 212 by making full use of the space in the pole column body 2, which is advantageous for improving the functions of the first storage groove 211 and / or the second storage groove 212, such as temporary storage and housing.

[0096] In some embodiments of this application, as shown in Figure 6, the battery cell 102 comprises a cell assembly 7 including an active material coated portion 71 housed in a housing cavity 1A and a conductive portion 72 connected to the active material coated portion 71. Exemplarily, the conductive portion 72 may be connected to the pole body 2 to form an electrical connection, thereby enabling electrode output from the pole body 2 of the cell assembly 7. For example, the conductive portion 72 may be connected to the pole body 2 by welding or the like. It is understood that the active material coated portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only a tab portion, or it may include a tab portion and a relay sheet electrically connected to the tab portion, and is not limited thereto.

[0097] Here, as shown in Figure 6, the pole body 2 has a communication hole 22 that connects the first housing groove 211 and the housing cavity 1A, and there is one or more communication holes 22, of which at least one is a liquid passage hole 23, and the conductive part 72 is inserted through at least one communication hole 22 so that at least a part of it is housed in the first housing groove 211. Exemplarily, the pole body 2 has a first housing groove 211 and a communication hole 22, the first housing groove 211 opens away from the housing cavity 1A and communicates with the outside of the case 1, the communication hole 22 is located on the side of the first housing groove 211 closer to the housing cavity 1A and penetrates the groove wall on the side of the first housing groove 211 closer to the housing cavity 1A to connect the first housing groove 211 and the housing cavity 1A, and at least one communication hole 22 is a liquid passage hole 23. The conductive portion 72 may be inserted into a communication hole 22 that serves as a liquid passage hole 23 (i.e., a communication hole 22 through which the conductive portion 72 is inserted can still allow the electrolyte to flow even after the conductive portion 72 is inserted), or it may be inserted into a communication hole 22 that does not serve as a liquid passage hole 23 (i.e., a communication hole 22 through which the conductive portion 72 is inserted must allow the electrolyte to flow after the conductive portion 72 is inserted).

[0098] As a result, at least a portion of the conductive portion 72 is housed in the first housing groove 211, so that at least a portion of the conductive portion 72 occupies the space within the first housing groove 211, thereby reducing the space occupied by the conductive portion 72 within the housing cavity 1A, saving space within the housing cavity 1A, and allowing a larger volume active material coated portion 71 to be housed, which is advantageous for improving the energy density of the battery cell 102, or, if the energy density of the battery cell 102 is constant, is advantageous for reducing the size of the battery cell 102.

[0099] In some embodiments, as shown in Figure 7, when the pole column body 2 has a second housing groove 212, the communication hole 22 connects the first housing groove 211 and the second housing groove 212, and at least one communication hole 22 is a liquid passage hole 23, and the conductive part 72 can be inserted through at least one communication hole 22 and enter the first housing groove 211. In this case, the conductive part 72 may be inserted through a communication hole 22 that is a liquid passage hole 23 (i.e., the communication hole 22 through which the conductive part 72 is inserted can still allow the electrolyte to flow even after the conductive part 72 is inserted), or it may be inserted through a communication hole 22 that is not a liquid passage hole 23 (i.e., the communication hole 22 through which the conductive part 72 is inserted must allow the electrolyte to flow after the conductive part 72 is inserted).

[0100] As a result, at least a portion of the conductive portion 72 is housed in the first housing groove 211, so that at least a portion of the conductive portion 72 occupies the space within the first housing groove 211, thereby reducing the space occupied by the conductive portion 72 within the housing cavity 1A, saving space within the housing cavity 1A, and allowing a larger volume active material coated portion 71 to be housed, which is advantageous for improving the energy density of the battery cell 102, or, if the energy density of the battery cell 102 is constant, is advantageous for reducing the size of the battery cell 102.

[0101] In some embodiments, referring to Figures 8 and 9, the communication hole 22 through which the conductive part 72 is inserted is the first communication hole 221 (that is, the conductive part 72 is inserted into at least one communication hole 22, and the communication hole 22 through which the conductive part 72 is inserted is the first communication hole 221), and at least the first communication hole 221 can be the liquid passage hole 23. Thus, regardless of whether the pole column body 2 has a second communication hole 222 through which the conductive part 72 is not inserted (described later), if it has a first communication hole 221 through which the conductive part 72 is inserted, the first communication hole 221 through which the conductive part 72 is inserted also has a liquid passage function, that is, the first communication hole 221 has a gap for liquid passage even when the conductive part 72 is inserted. When the electrolyte is injected, at least a portion of it can flow into the housing cavity 1A through the first communication hole 221 through which the conductive part 72 is inserted, as the electrolyte is injected into the first housing groove 211.

[0102] In some embodiments, referring to Figures 10 to 12, the communication hole 22 through which the conductive part 72 is inserted is the first communication hole 221, and there are multiple communication holes 22, further including at least one second communication hole 222 through which the conductive part 72 is not inserted (i.e., the conductive part 72 is not inserted into at least one communication hole 22, and the communication hole 22 through which the conductive part 72 is not inserted is the second communication hole 222). At least the second communication hole 222 can be a liquid passage hole 23.

[0103] For example, if the first communication hole 221 also has a liquid passage function (i.e., the first communication hole 221 has a gap for liquid passage even when the conductive part 72 is inserted), then both the first communication hole 221 and the second communication hole 222 become liquid passage holes 23. When the electrolyte is injected, when it is injected into the first housing groove 211, a portion of it can flow into the housing cavity 1A through the first communication hole 221 through which the conductive part 72 is inserted, and another portion can flow into the housing cavity 1A through the second communication hole 222 through which the conductive part 72 is not inserted.

[0104] Furthermore, for example, if the first communication hole 221 does not have a liquid passage function (i.e., the first communication hole 221 is blocked after the conductive part 72 is inserted and does not allow liquid to pass through), then only the second communication hole 222 becomes the liquid passage hole 23. When the electrolyte is injected, once it is injected into the first housing groove 211, it flows into the housing cavity 1A only through the second communication hole 222 through which the conductive part 72 is not inserted.

[0105] In the embodiment of this application, if at least the first communication hole 221 is a liquid passage hole 23, the first communication hole 221 also has a liquid passage function, that is, the first communication hole 221 can be used to allow the electrolyte to pass through after the conductive part 72 has been inserted. In this case, the electrolyte can be passed through at least the first communication hole 221, and it is possible to select whether or not to provide further communication holes 22 through which the conductive part 72 is not inserted (for example, a second communication hole 222) as needed, which is advantageous in reducing the total number of communication holes 22, simplifies the structure and processing of the pole column body 2, and improves the structural strength of the pole column body 2.

[0106] In the embodiment of this application, if at least the second communication hole 222 is a liquid passage hole 23, the electrolyte can be passed through at least the second communication hole 222. In this case, it is not necessary to increase the diameter or number of the first communication hole 221 in order to allow the electrolyte to pass through the first communication hole 221, nor is it necessary to reduce the size of the conductive part 72 in order to allow the electrolyte to pass through the first communication hole 221. It is sufficient to design the size of the first communication hole 221 to be slightly larger than the size of the conductive part 72 in order to allow the conductive part 72 to pass through. This improves the problem of impurities falling into the housing cavity 1A through the gap between the conductive part 72 and the first communication hole 221, improves the problem of reduced local strength of the pole column body 2 due to the size of the first communication hole 221 being too large, and allows the size of the conductive part 72 to be relatively large, which is advantageous for improving current passage efficiency. Furthermore, since the electrolyte is not affected by the conductive part 72 when passing through the second communication hole 222, the injection efficiency can be improved, and the possibility of the electrolyte causing problems such as contamination or corrosion of the conductive part 72 is also reduced.

[0107] For example, in Example 1 of this application, there is at least one communication hole 22, and a conductive part 72 is inserted through each communication hole 22, so each communication hole 22 is a first communication hole 221. In this case, at least one first communication hole 221 becomes a liquid passage hole 23, and when the electrolyte is injected into the first housing groove 211, it flows into the housing cavity 1A from the first communication hole 221 through which the conductive part 72 is inserted.

[0108] For example, in Example 2 of this application, there are at least two communication holes 22, at least one of which is a first communication hole 221 through which the conductive part 72 is inserted, and at least one of which is a second communication hole 222 through which the conductive part 72 is not inserted. In this case, both the first communication hole 221 and the second communication hole 222 become liquid passage holes 23, and when the electrolyte is injected into the first housing groove 211, a portion of it flows into the housing cavity 1A from the first communication hole 221 through which the conductive part 72 is inserted, and the remaining portion flows into the housing cavity 1A from the second communication hole 222 through which the conductive part 72 is not inserted.

[0109] For example, in Example 3 of this application, there are at least two communication holes 22, at least one of which is a first communication hole 221 through which the conductive part 72 is inserted, and at least one of which is a second communication hole 222 through which the conductive part 72 is not inserted. The first communication hole 221 is closed after the conductive part 72 is inserted, preventing liquid from passing through. In this case, only the second communication hole 222 becomes a liquid passage hole 23, and when the electrolyte is injected into the first housing groove 211, it flows into the housing cavity 1A through the second communication hole 222 through which the conductive part 72 is not inserted.

[0110] In some embodiments, referring to Figures 8 and 9, the pole column body 2 is formed as an elongated structure, and the communication hole 22 (i.e., the first communication hole 221) through which the conductive part 72 is inserted is formed as an elongated hole whose length is greater than its width and whose length extends from one end to the other of the pole column body 2. This makes it possible to make the length of the first communication hole 221 as long as possible by making full use of the space of the pole column body 2, and a larger size conductive part 72 can be inserted into the first communication hole 221, which is advantageous for increasing the size of the conductive part 72 and improving the current passage efficiency. When the first communication hole 221 is a liquid passage hole 23, making the length of the first communication hole 221 is also advantageous for improving the liquid injection efficiency.

[0111] In some embodiments, when the communication hole 22 through which the conductive part 72 is inserted is the first communication hole 221, both the first communication hole 221 and the conductive part 72 are multiple, and at least one conductive part 72 is inserted into each first communication hole 221. In this case, at least two conductive parts 72 are inserted into each of the communication holes 22, and as a result, the problem of reduced local strength of the pole column body 2 due to the large size of a single first communication hole 221 can be improved. Furthermore, when the first communication hole 221 is used as a liquid passage hole 23, increasing the number of first communication holes 221 is also advantageous in improving liquid injection efficiency.

[0112] For example, if the first communication hole 221 is formed as an elongated hole whose length is greater than its width and whose length extends from one end to the other of the pole column body 2, then multiple first communication holes 221 can be arranged at intervals in the width direction of the pole column body 2. In this way, the space on the pole column body 2 can be fully utilized, and the problem of reduced local strength of the pole column body 2 due to the large size of a single first communication hole 221 can be improved. Furthermore, if the first communication hole 221 is used as a liquid passage hole 23, increasing the number of first communication holes 221 is also advantageous in improving liquid injection efficiency.

[0113] In some embodiments, referring to Figure 10, when the pole column body 2 has both a first communication hole 221 and a second communication hole 222, if the first communication hole 221 is formed as a long hole whose length is greater than its width and whose length direction extends from one end to the other of the pole column body 2, then the second communication hole 222 can be provided at least one of the ends of the length of the first communication hole 221. As a result, the space can be fully utilized, and assuming an improvement in the structural strength of the pole column body 2, the size of the second communication hole 222 can be made as large as possible, improving the liquid injection efficiency. Furthermore, if the second communication holes 222 are provided at both ends of the length of the first communication hole 221, the liquid injection efficiency can be further improved, the size of each second communication hole 222 can be reduced, and the problem of localized weakening of the pole column body 2 can be improved.

[0114] Of course, in the embodiments of this application, the shape of the first communication hole 221 and the relative positional relationship between the first communication hole 221 and the second communication hole 222 are not limited to the above description and can be adjusted according to the actual situation.

[0115] It should be explained that, as shown in Figure 10, the liquid passage hole 23 may be positioned offset from the connection portion (e.g., a weld mark) formed by the connection between the conductive portion 72 and the pole column body 2 (i.e., not overlapping). In this way, the electrolyte injected into the first housing groove 211 is smoothly injected into the housing cavity 1A through the liquid passage hole 23 without being blocked by the connection portion, improving the injection efficiency.

[0116] Of course, this application is not limited thereto, and in other embodiments of this application, as shown in Figure 17, the conductive portion 72 may not be inserted through the communication hole 22 and may not enter the first housing groove 211. In this case, the conductive portion 72 may be connected to the wall surface of the pole post body 2 facing the housing cavity 1A such that its entirety is located on the side of the first housing groove 211 that is closer to the housing cavity 1A. In this case, each communication hole 22 can be a liquid passage hole 23. This prevents the electrolyte from coming into contact with the connection portion (e.g., a weld mark) formed by the connection between the conductive portion 72 and the pole post body 2 when the electrolyte enters the first housing groove 211, thereby reducing contamination and corrosion of the connection portion between the conductive portion 72 and the pole post body 2 by the injected electrolyte.

[0117] For example, if the pole column body 2 has a second housing groove 212, as shown in Figure 17, the conductive portion 72 may not be inserted through the communication hole 22, and its entirety may be located on the side of the first housing groove 211 closer to the housing cavity 1A. For example, the conductive portion 72 is connected to the wall surface of the pole column body 2 facing the housing cavity 1A so as to be connected to the groove wall of the second housing groove 212 on the side away from the housing cavity 1A (for example, the groove top wall of the second housing groove 212). In this case, at least a portion of the conductive portion 72 can be housed in the second housing groove 212, thereby reducing the space occupied by the conductive portion 72 within the housing cavity 1A, saving space within the housing cavity 1A, allowing for the housing of a larger volume active material coated portion 71, which is advantageous for improving the energy density of the battery cell 102, or, if the energy density of the battery cell 102 is constant, is advantageous for reducing the size of the battery cell 102.

[0118] Furthermore, if the pole column body 2 has a second housing groove 212 and the conductive part 72 is connected to the wall surface of the pole column body 2 facing the housing cavity 1A, each communication hole 22 can be a liquid passage hole 23. This prevents the electrolyte from coming into contact with the connection part (e.g., a weld mark) formed by the conductive part 72 and the pole column body 2 in the second housing groove 212 when the electrolyte enters the first housing groove 211, thereby reducing contamination and corrosion of the connection part between the conductive part 72 and the pole column body 2 by the injected electrolyte.

[0119] In some embodiments of this application, as shown in Figure 10, the pole column body 2 is formed as an elongated structure, and the first accommodating groove 211 is formed as an elongated groove body, that is, the first accommodating groove 211 has a length greater than its width and extends in the longitudinal direction from one end to the other of the pole column body 2. This is advantageous for making full use of the space in the pole column body 2 to enlarge the size of the first accommodating groove 211 and improve the liquid injection efficiency, and it is advantageous for further improving the liquid injection efficiency by making it easier to design the enlarged diameter of the liquid injection nozzle, such as setting the outlet end of the liquid injection nozzle to fit the groove opening of the first accommodating groove 211.

[0120] In some embodiments of this application, the groove wall of the first housing groove 211 on the side closer to the housing cavity 1A may be an inclined surface that slopes downward toward the direction of the liquid passage hole 23. This facilitates the rapid flow of the electrolyte in the first housing groove 211 toward the liquid passage hole 23, improving the liquid injection efficiency and mitigating the problem of liquid accumulation in the first housing groove 211.

[0121] In some embodiments of this application, the cross-sectional shape of the pole column body 2 may be set to match the cross-sectional shape of the first storage groove 211. This makes full use of the space, increases the size of the first storage groove 211 as much as possible, and increases the temporary storage capacity of the first storage groove 211.

[0122] In some embodiments of this application, when the first accommodating groove 211 is formed as an elongated groove, the cross-sectional shape of the first accommodating groove 211 may, for example, be oval, rectangular, or elliptical, thereby allowing for flexible configuration. Here, oval is also called a runway shape, and is formed by connecting semicircles to each end of the length of a rectangle.

[0123] In some embodiments of this application, the groove opening of the first housing groove 211 is diagonally expanding, that is, the groove opening of the first housing groove 211 gradually increases in the direction away from the housing cavity 1A. This facilitates the fitting of the first housing groove 211 with the liquid injection nozzle, allowing the liquid injection nozzle to easily enter the groove opening of the first housing groove 211, thus acting as a positional restraint for the liquid injection nozzle, improving the fitting stability between the liquid injection nozzle and the groove opening of the first housing groove 211, and reducing the possibility of leakage during liquid injection.

[0124] In some embodiments of this application, referring to Figures 13 to 15, the battery cell 102 is provided so as to cover the pole body 2 and further comprises a pole cover plate 3 that seals the groove opening of the first housing groove 211. In this way, after the electrolyte is injected, the pole cover plate 3 is provided so as to cover the pole body 2, and the groove opening of the first housing groove 211 in the pole body 2 can be sealed by the pole cover plate 3. As a result, the electrolyte injection passage 2B becomes sealed, preventing the electrolyte from overflowing and preventing external foreign matter from entering the battery cell 102, thereby improving the reliability of the battery cell 102.

[0125] It should be explained that the pole column cover plate 3 is a cover plate without holes, thereby ensuring the reliability of the seal. It should also be explained that the material of the pole column cover plate 3 is not limited; it may be a single material such as an aluminum cover plate, or a composite material such as a copper-aluminum composite cover plate, and further explanation is omitted here.

[0126] Furthermore, it should be explained that if the housing groove 21 includes a first housing groove 211 having a groove opening that opens outward, the liquid passage hole 23 may be provided on the side of the first housing groove 211 closer to the housing cavity 1A and may penetrate the groove wall on the side of the first housing groove 211 closer to the housing cavity 1A. In this case, the first housing groove 211 corresponds to a recessed structure, and as a result, the liquid passage hole 23 is separated from the groove opening of the first housing groove 211, and the distance from the liquid passage hole 23 to the connection point between the pole cover plate 3 and the pole body 2 is large. If the electrolyte overflows from the liquid passage hole 23, the overflowed electrolyte is less likely to come into contact with the connection point between the pole body 2 and the pole cover plate 3 (e.g., welding or bonding), thereby reducing corrosion and contamination of this connection point.

[0127] In some embodiments, when the pole column body 2 is formed as a long structure, the pole column cover plate 3 may also be a long cover plate. This is advantageous for matching the shapes of the pole column body 2 and the pole column cover plate 3 to ensure a good fit, and it makes it easier to increase the area of ​​the pole column cover plate 3, which is advantageous for mounting and connecting the pole column cover plate 3 and the pole column body 2. For example, the shape of the pole column cover plate 3 may be oval, rectangular, or elliptical. Here, oval is also called runway shape, and is formed by joining semicircles at each end of the length of a rectangle.

[0128] It can be understood that the pole post cover plate 3 is positioned on the outside of at least a portion of the pole post body 2 (i.e., on the side away from the housing cavity 1A), so that the pole post cover plate 3 is provided to cover the pole post body 2. Here, the method of mounting the pole post cover plate 3 and the pole post body 2 is not limited; for example, the pole post cover plate 3 may be positioned entirely on the outside of the pole post body 2 (i.e., on the side away from the housing cavity 1A), or a portion of it may be fitted into the pole post body 2.

[0129] In some embodiments of this application, as shown in Figures 13 to 15, at least a portion of the pole column cover plate 3 is fitted into the first housing groove 211. By fitting at least a portion of the pole column cover plate 3 into the first housing groove 211, the space occupied by the pole column cover plate 3 outside the pole column body 2 is reduced, thereby improving the compactness of the structure.

[0130] As an example, a cavity is formed between the pole plate cover 3 and the groove wall of the first housing groove 211. In this way, during use of the battery cell 102, the cavity can be used to temporarily store gas generated within the battery cell 102 or electrolyte that overflows from the housing cavity 1A, which is advantageous in improving the operational reliability of the battery cell 102.

[0131] In some embodiments of this application, as shown in Figures 13 to 15, the edge of the pole column cover plate 3 has an overlapping joint portion 32 that is overlapped and joined to the side of the pole column body 2 away from the housing cavity 1A. This facilitates fitting and connection between the pole column cover plate 3 and the pole column body 2. Furthermore, if the pole column body 2 is welded to the pole column body 2 by the overlapping joint portion 32 and the pole column body 2 has a liquid passage hole 23, the overlapping joint portion 32 can be separated from the liquid passage hole 23. If the electrolyte overflows from the liquid passage hole 23, the electrolyte can be separated from the welded area between the overlapping joint portion 32 and the pole column body 2, thereby improving problems such as corrosion and contamination at this welded area. In addition, it is easy to realize that there is a cavity between the pole column cover plate 3 and the groove wall of the first housing groove 211.

[0132] As an example, as shown in Figures 13 to 15, the pole column body 2 has a counterbore groove 25 on the surface away from the housing cavity 1A that surrounds the first housing groove 211, and at least a portion of the overlapping joint 32 is fitted into the counterbore groove 25, so that the overlapping joint 32 is overlapped and joined to the side of the pole column body 2 away from the housing cavity 1A. This improves the mounting efficiency of the pole column body 2 and the pole column cover plate 3 due to the positioning role of the counterbore groove 25. Furthermore, the positional restriction role of the counterbore groove 25 improves the stability and reliability of the fitting between the pole column body 2 and the pole column cover plate 3. In addition, the presence of the counterbore groove 25 allows the pole column cover plate 3 to be fitted further into the pole column body 2, so that the pole column cover plate 3 protrudes slightly from the pole column body 2 or does not protrude at all, which is advantageous in reducing the space occupied outside the pole column body 2.

[0133] In some embodiments of this application, as shown in Figure 14, there is a fitting gap 26 between the overlapping joint 32 and the side wall of the counterbore groove 25, and the size W of one end of the fitting gap 26 away from the housing cavity 1A is less than 0.05 mm, that is, the fitting gap 26 is greater than 0 mm and less than 0.05 mm. This allows the overlapping joint 32 of the pole column cover plate 3 to be smoothly fitted into the counterbore groove 25 of the pole column body 2, while preventing the fitting gap 26 between the two from becoming too large. When the overlapping joint 32 and the pole column body 2 are connected by welding, the welding yield between the overlapping joint 32 and the pole column body 2 can be improved. It should be noted that the welding method between the overlapping joint 32 and the pole column body 2 is not limited, and for example, hot melt welding or blaze welding may be used, and exemplary, the overlapping joint 32 and the pole column body 2 may be welded by continuous laser welding.

[0134] In some embodiments of this application, the shape of the pole column cover plate 3 conforms to the cross-sectional shape of the first housing groove 211, and the overlapping joint portion 32 conforms to the cross-sectional shape of the counterbore groove 25, thereby ensuring good uniformity of the fitting gap 26 between the overlapping joint portion 32 and the side wall of the counterbore groove 25.

[0135] In some embodiments of this application, as shown in Figures 6 and 14, the pole column body 2 may include an outer retaining portion 271 that restricts it to the outside of the case 1 and an inner retaining portion 272 that restricts it to the inside of the case 1, and the overlapping joint portion 32 is overlapped and joined to the outer retaining portion 271. The pole column body 2 is riveted to the case 1 to form the outer retaining portion 271. That is, the pole column body 2 is fixed to the case 1 by riveting, and the pole column body 2 forms the outer retaining portion 271 after riveting. In other words, the pole column body 2 does not have the outer retaining portion 271 before riveting, and the outer retaining portion 271 can be formed after riveting. For example, the pole column body 2 may be formed by press molding and then fixed to the case 1 by riveting.

[0136] This simplifies the pre-processing (e.g., press process) before riveting the pole column body 2, making it easier to obtain the outer retaining portion 271. If the structure of the outer retaining portion 271 is relatively complex, the mold (e.g., press mold) for pre-processing the pole column body 2 can be simplified, reducing production costs. Furthermore, the pole column body 2, which is riveted to the case 1, may be an integrally molded member. This ensures that the pole column body 2 is securely connected to the case 1, the connection between the outer retaining portion 271 and the inner retaining portion 272 is stable and reliable, and is advantageous in improving the reliability of the connection between the pole column body 2 and the pole column cover plate 3.

[0137] Of course, this application is not limited thereto, and for example, in other embodiments, the internal stopper 272 may be manufactured by riveting. Alternatively, in other embodiments, the pole body 2 may be obtained by a process other than riveting, for example, the pole body 2 may be divided into two parts and welded together to fix it to the case 1.

[0138] Exemplary, as shown in Figure 6, the battery cell 102 may further include a sealing gasket 1023 (e.g., a sealing link) and an insulating gasket 1024 (e.g., a plastic gasket), the sealing gasket 1023 and the insulating gasket 1024 being sandwiched between the pole body 2 and the case 1, and fixed between the pole body 2 and the case 1 by riveting the pole body 2 to the case 1, thereby improving production efficiency and avoiding adverse thermal effects on the sealing gasket 1023 and insulating gasket 1024 due to the welding process. For example, during riveting, the compression amount of the sealing gasket 1023 (i.e., the difference between the thickness of the sealing gasket 1023 after deformation and the thickness before deformation divided by the thickness before deformation) may be % or more, thereby ensuring airtightness.

[0139] In some embodiments, the pole column body 2 does not have a portion that stops on the outside of the pole column cover plate 3 (i.e., the side away from the housing cavity 1A), so the pole column cover plate 3 is suitable for being attached to the pole column body 2 from the outside (i.e., the side away from the housing cavity 1A). In this way, by providing the pole column cover plate 3 to be attached to the pole column body 2 from the outside and sealing the groove opening of the first housing groove 211, the pole column cover plate 3 can be attached after the liquid is injected, ensuring airtightness, and because the attachment position is close to the outside, the pole column cover plate 3 can be quickly attached.

[0140] In some embodiments of this application, the pole post cover plate 3 can seal the groove opening of the first housing groove 211, thus eliminating the need to separately seal the liquid passage hole 23 as needed, simplifying sealing, improving production efficiency, and reducing production costs. However, this application is not limited thereto. For example, in other embodiments of this application, assuming that the pole post cover plate 3 is provided, a first sealing structure 1025 for sealing the liquid passage hole 23 may be further provided, thereby improving the sealing reliability for the liquid injection passage 2B. Also, in some other embodiments of this application, if the first sealing structure 1025 is provided, the pole post cover plate 3 may not be provided.

[0141] For example, in some embodiments, the first sealing structure 1025 may be configured such that at least a portion of it is fitted into the liquid passage hole 23 and crimped into the liquid passage hole 23 to seal it. This allows the first sealing structure 1025 to be fixed by crimping, which is advantageous for the quick installation of the first sealing structure 1025 and for improving the sealing reliability of the first sealing structure 1025 to the liquid passage hole 23. Of course, this application is not limited thereto, and for example, in other embodiments, the first sealing structure 1025 may be in an immovable form such as welding or riveting, or in a removable form such as screw connection or rotary fastening, and is not limited thereto. Also, to facilitate the installation of the first sealing structure 1025, the liquid passage hole 23 may be made in an enlarged diameter shape or the like.

[0142] In embodiments of this application, the housing groove 21 does not necessarily include a first housing groove 211 that opens away from the housing cavity 1A. For example, in some embodiments, as shown in Figure 18, the housing groove 21 includes a third housing groove 213 having a groove opening that opens toward the housing cavity 1A, and the through hole 28 includes an injection hole 24 that penetrates the groove wall of the third housing groove 213 on the side away from the housing cavity 1A. That is, the injection hole 24 is located outside the third housing groove 213 and penetrates the groove wall on the side closer to the outside of the third housing groove 213. In this way, when electrolyte is injected into the battery cell 102, the electrolyte injected from outside the pole body 2 enters the third housing groove 213 through the injection hole 24 and then flows toward the housing cavity 1A through the groove opening of the third housing groove 213. As a result, the third storage groove 213 can serve as a temporary storage space for the electrolyte, and the side walls of the third storage groove 213 can prevent the electrolyte from splashing, facilitating rapid injection.

[0143] Furthermore, the height of the injection hole 24 can be increased, and if the injection hole 24 is blocked, the gas or electrolyte generated in the housing cavity 1A can enter the third housing groove 213, which can serve as temporary storage, thereby improving the operational reliability of the battery cell 102. Also, if the injection hole 24 is blocked by a long sealing nail, because the height of the injection hole 24 is increased, the length of the sealing nail protruding from the lower end of the injection hole 24 will be shortened, or it will not protrude from the lower end of the injection hole 24 at all. As a result, the sealing nail is less likely to interfere with the cell assembly 7 in the housing cavity 1A, or it is not necessary to thicken the lower plastic structure below the pole column body 2 to avoid interference between the sealing nail and the cell assembly 7, which is advantageous for thinning the lower plastic structure, which is advantageous for reducing material costs, and it is possible to reduce the space occupied by the lower plastic structure in the housing cavity 1A, which is advantageous for improving the energy density of the battery cell 102.

[0144] Furthermore, if the electrolyte injection height coincides with the lower end of the injection hole 24, the presence of a third accommodating groove 213 below the injection hole 24 allows for a higher electrolyte injection height, which is advantageous for increasing the total amount of electrolyte injected and, consequently, improving the cycle life of the battery cell 102.

[0145] In some embodiments, as shown in Figure 18, the battery cell 102 comprises a cell assembly 7 including an active material coated portion 71 housed in a housing cavity 1A and a conductive portion 72 connected to the active material coated portion 71, wherein at least a portion of the conductive portion 72 is housed in a third housing groove 213 and connected to the groove wall of the third housing groove 213 on the side away from the housing cavity 1A. This allows at least a portion of the conductive portion 72 to be housed in the third housing groove 213, thereby reducing the space occupied by the conductive portion 72 within the housing cavity 1A, saving space within the housing cavity 1A, and allowing for the housing of a larger volume active material coated portion 71, which is advantageous for improving the energy density of the battery cell 102, or, if the energy density of the battery cell 102 is constant, is advantageous for reducing the size of the battery cell 102.

[0146] It should be explained that, as shown in Figure 18, the injection hole 24 may be positioned offset from the connection portion (e.g., a weld mark) formed by the connection between the conductive portion 72 and the pole column body 2 (i.e., they do not overlap). In this way, when the electrolyte is injected from the injection hole 24 into the third housing groove 213, the electrolyte can enter the third housing groove 213 smoothly without being blocked by the connection portion, and then enter the housing cavity 1A, which is advantageous for improving the injection efficiency.

[0147] For example, the pole column body 2 is formed as an elongated structure, and the third storage groove 213 is formed as an elongated groove body, that is, the third storage groove 213 has a length greater than its width and extends in the direction from one end to the other of the pole column body 2. This is advantageous in making full use of the space in the pole column body 2 to increase the size of the third storage groove 213 and improve the liquid injection efficiency. In some embodiments of this application, the cross-sectional shape of the pole column body 2 may be set to match the cross-sectional shape of the third storage groove 213. This makes full use of the space, increases the size of the third storage groove 213 as much as possible, and increases the temporary storage capacity of the third storage groove 213.

[0148] In the embodiments of this application, the relative positional relationship between the injection hole 24 and the pole column body 2 is not limited. For example, the injection hole 24 may be located in the center of the pole column body 2, or it may be located eccentrically with respect to the pole column body 2. For example, the injection hole 24 may be located eccentrically in the longitudinal direction of the pole column body 2, that is, the center point of the injection hole 24 located in the pole column body 2 may be on one side in the longitudinal direction of the pole column body 2. This allows the injection hole 24 to avoid the connection area between the conductive part 72 and the pole column body 2 as much as possible, reducing contamination and corrosion of the connection area (e.g., weld marks) formed by the conductive part 72 and the pole column body 2 by the injected electrolyte. Furthermore, the size of the conductive part 72 can be made relatively large, making connection with the pole column body 2 easier and increasing the current flow efficiency.

[0149] In some embodiments of this application, as shown in Figure 19, the flow path area of ​​the liquid inlet end 24a of the injection hole 24 is larger than the flow path area of ​​the liquid outlet end 24b of the injection hole 24. When the electrolyte is injected into the injection hole 24, it flows from the liquid inlet end 24a to the liquid outlet end 24b. Making the flow path area of ​​the liquid inlet end 24a of the injection hole 24 larger than the flow path area of ​​the liquid outlet end 24b of the injection hole 24 is advantageous in improving the injection efficiency and mitigating the problem of electrolyte overflow. Furthermore, when the injection hole 24 and the injection nozzle are fitted together, the relatively large flow path area of ​​the liquid inlet end 24a of the injection hole 24 makes it easier to insert the injection nozzle into the injection hole 24, which is advantageous in improving the injection efficiency.

[0150] In some embodiments of this application, as shown in Figure 20, the battery cell 102 further comprises a second sealing structure 1026 that seals the injection hole 24. By providing the second sealing structure 1026 for sealing the injection hole 24, the liquid injection passage 2B is sealed, preventing electrolyte overflow and preventing external foreign matter from entering the battery cell 102, thereby improving the reliability of the battery cell 102. Furthermore, if the flow path area of ​​the liquid inlet end 24a of the injection hole 24 is larger than the flow path area of ​​the liquid outlet end 24b of the injection hole 24, the second sealing structure 1026 and the injection hole 24 can be quickly attached.

[0151] For example, in some embodiments, the second sealing structure 1026 may be configured such that at least a portion of it is fitted into the injection hole 24 and crimped into the injection hole 24 to seal it. This allows the second sealing structure 1026 to be fixed by crimping, which is advantageous for the quick installation of the second sealing structure 1026 and for improving the sealing reliability of the second sealing structure 1026 to the injection hole 24. Of course, this application is not limited thereto, and for example, in other embodiments, the second sealing structure 1026 may be in an immovable form such as welding or riveting, or in a removable form such as screw connection or rotary fastening, and is not limited thereto. Also, to facilitate the installation of the second sealing structure 1026, the injection hole 24 may be made in an enlarged diameter shape or the like.

[0152] In some embodiments of this application, the structures of the first sealing structure 1025 and the second sealing structure 1026 may be the same or different, for example, both may be set sealing structures. The shapes of the liquid passage hole 23 and the injection hole 24 may also be the same or different, for example, both may be set holes.

[0153] In some embodiments, the setting seal structure (e.g., the first seal structure 1025 and the second seal structure 1026) may be removable or fixed. For example, if the setting seal structure is removable, it is advantageous for maintenance of the setting hole (e.g., the liquid passage hole 23 or the injection hole 24). For instance, if the electrolyte needs to be replenished, the setting seal structure can be removed, the setting hole opened, the electrolyte replenished and injected, and then the setting seal structure can be reattached. For example, the setting seal structure can be detachably connected to the pole column body 2 by screw threads or rotary fasteners, making attachment and detachment easier. For example, as shown in Figure 20, if the setting seal structure is fixed and not removable, it can be fixed to the pole column body 2 by welding or riveting, improving the sealing reliability of the setting seal structure to the setting hole.

[0154] In some embodiments, at least a portion of the set sealing structure (e.g., the first sealing structure 1025 and the second sealing structure 1026) is fitted into a set hole (e.g., a liquid passage hole 23 or an injection hole 24). That is, the set sealing structure may be entirely fitted into the set hole, or only a portion of it may be fitted into the set hole. This allows for full utilization of the space within the set hole and improves the sealing reliability of the set sealing structure relative to the set hole, while reducing the protrusion height of the set sealing structure from the set hole and reducing the space occupied by the set sealing structure outside the pole column body 2, which is advantageous for reducing the overall size of the battery cell 102.

[0155] In some embodiments of this application, as shown in Figure 21, the set sealing structure may include a first sealing member 4, at least a portion of which is fitted into the set hole and crimped into the set hole to seal it. This allows the first sealing member 4 to be fixed by crimping, which is advantageous for the rapid installation of the first sealing member 4 and for improving the sealing reliability of the first sealing member 4 with respect to the set hole.

[0156] In some embodiments of this application, the setting sealing structure may include a second sealing member 5, which is provided to cover the inlet end of the setting hole and connected to the pole column body 2. Specifically, the phrase "the second sealing member 5 is provided to cover the inlet end of the setting hole" should be understood broadly, and the second sealing member 5 may be provided to cover the outside of the inlet end, or it may be fitted inside the inlet end, or it may be located near the inlet end and cap the inlet end. This allows sealing to be performed from the source of the setting hole (i.e., the inlet end), reduces the possibility of contamination of the setting hole by foreign matter, and by providing the second sealing member 5 to cover the inlet end of the setting hole, the second sealing member 5 can be quickly attached, improving the attachment efficiency of the second sealing member 5.

[0157] Specifically, the fitting method between the second sealing member 5 and the pole column body 2 is not limited. For example, in some embodiments, the edge of the second sealing member 5 may be overlapped and joined to the outside of the pole column body 2 (i.e., the edge of the second sealing member 5 may be overlapped and joined to the side of the pole column body 2 away from the housing cavity 1A), and / or at least a part of the second sealing member 5 may be fitted into a setting hole, and the second sealing member 5 may be welded to the pole column body 2 to achieve a sealed fit. This overlapping and / or fitting method is advantageous for mounting and positioning the second sealing member 5, and achieving a sealed connection between the second sealing member 5 and the pole column body 2 by welding improves the reliability of the sealed connection between the second sealing member 5 and the pole column body 2.

[0158] In some embodiments, the setting hole includes a first hole 241 and a second hole 242 that are sequentially provided in the direction of liquid flow, the diameter of the first hole 241 being larger than the diameter of the second hole 242, that is, the flow area of ​​any cross-section of the first hole 241 being larger than the flow area of ​​any cross-section of the second hole 242, and at least a portion of the second sealing member 5 being fitted into the first hole 241 and covering the second hole 242.

[0159] In the above technical solution, the portion of the second sealing member 5 that fits into the first hole 241 can cover the second hole 242, thus ensuring a secure seal of the set hole. Furthermore, because the diameter of the first hole 241 is relatively large, at least part of the second sealing member 5 fits into the first hole 241, making it easy to install and position the second sealing member 5, eliminating the need for positioning jigs for connection, and facilitating connection between the second sealing member 5 and the pole body 2. In addition, the space occupied by the second sealing member 5 outside the pole body 2 can be reduced, which is advantageous for reducing the overall size of the battery cell 102.

[0160] In some embodiments, as shown in Figure 21, the edge of the second sealing member 5 is sealed to the wall of the first hole 241. In the above technical solution, by sealing the edge of the second sealing member 5 to the wall of the first hole 241, the second sealing member 5 can be completely housed in the first hole 241 in the radial direction, further reducing the space occupied by the second sealing member 5 outside the pole column body 2, which is advantageous in improving the compactness of the fitting between the second sealing member 5 and the pole column body 2. In addition, the restriction of the edge of the second sealing member 5 by the wall of the first hole 241 can improve the stability and reliability of the connection between the second sealing member 5 and the pole column body 2. Exemplarily, the second sealing member 5 may also be completely immersed in the first hole 241 in the axial direction, which is advantageous in further reducing the space occupied by the second sealing member 5 outside the pole column body 2.

[0161] In some embodiments, as shown in Figure 22, the second sealing member 5 includes an extended portion 51 that extends outside the first hole 241 and is overlapped and sealed to the wall surface of the pole column body 2 on the side away from the housing cavity 1A. This allows the radial size of the extended portion 51 in the first hole 241 to be increased as needed, which is advantageous for increasing the sealing-connection area between the second sealing member 5 and the pole column body 2, and improving the reliability of the sealing connection between the second sealing member 5 and the pole column body 2. Furthermore, the shape requirements of the first hole 241 are low, and it is not necessary to create a gap fit between the edge of the second sealing member 5 and the hole wall of the first hole 241 that matches the shape and satisfies the requirements, thereby reducing the processing accuracy of the second sealing member 5 in the pole column body 2, improving production efficiency, and reducing production costs.

[0162] In some embodiments, as shown in Figures 21 and 22, the setting hole has a stepped surface at the connection point between the first hole 241 and the second hole 242, and the portion of the second sealing member 5 that fits into the first hole 241 is supported by the stepped surface. This improves the connection stability between the second sealing member 5 and the pole column body 2.

[0163] In some embodiments, the set sealing structure includes both a first sealing member 4 and a second sealing member 5, the first sealing member 4 being tightly fitted into the second hole 242 (i.e., the first sealing member 4 achieving sealing of the second hole 242 by its tight fit), and the second sealing member 5 being located on the side closer to the housing cavity 1A. In the above technical solution, the set sealing structure includes both a first sealing member 4 and a second sealing member 5, the second sealing member 5 can play a role in preventing the first sealing member 4 from coming out of the set hole, improving the reliability of the tight fit between the first sealing member 4 and the second hole 242, and improving the overall sealing reliability of the set sealing structure with respect to the set hole. Furthermore, the first sealing member 4 is fixed by the tight fit, which is advantageous for the rapid installation of the first sealing member 4.

[0164] Furthermore, if the first hole 241 is configured such that "the flow area of ​​the first hole 241 gradually decreases or remains unchanged in the direction from the first hole 241 to the second hole 242, and the flow area at the outlet end of the first hole 241 is greater than or equal to the flow area at the inlet end of the second hole 242," then it is advantageous for mounting and connecting the second sealing member 5.

[0165] In some embodiments, as shown in Figures 21 and 22, the second sealing member 5 includes a bypass portion 54 that protrudes away from the first sealing member 4, and a bypass cavity 55 is formed on the side of the bypass portion 54 facing the first sealing member 4, with a portion of the first sealing member 4 entering the bypass cavity 55. In the above technical solution, the compactness of the fitting between the first sealing member 4 and the second sealing member 5 can be improved, reducing space occupation and waste, and the volume of the battery cell 102 can be reduced. Furthermore, because the second sealing member 5 has an uneven shape, the structural strength of the second sealing member 5 can be improved, and the reliability and stability of the fitting between the second sealing member 5 and the pole column body 2 can be improved.

[0166] In some embodiments of this application, as shown in Figures 21 and 22, the set sealing structure includes both a first sealing member 4 and a second sealing member 5, wherein at least a portion of the first sealing member 4 is fitted into the set hole and tightly fitted into the set hole to seal it, the edge of the second sealing member 5 is overlapped and joined to the outside of the pole post body 2 (see Figure 22, i.e., the edge of the second sealing member 5 is overlapped and joined to the side of the pole post body 2 away from the housing cavity 1A), and / or at least a portion of the second sealing member 5 is fitted into the set hole (see Figures 21 and 22), the second sealing member 5 is welded and sealed to the pole post body 2, and the second sealing member 5 is located on the side of the first sealing member 4 away from the housing cavity 1A. As a result, the first sealing member 4 can effectively seal the setting hole, and the second sealing member 5 can not only seal the setting hole but also prevent the first sealing member 4 from coming off the setting hole, thereby improving the sealing reliability of the setting sealing structure with respect to the setting hole.

[0167] For example, the first sealing member 4 may be made of a material such as plastic or rubber, which is advantageous for a tight fit and improves the sealing effect.

[0168] For example, the second sealing member 5 may be made of the same metal material as the pole column body 2, for example, an aluminum member, which is advantageous in improving the welding yield between the second sealing member 5 and the pole column body 2. Furthermore, it should be explained that the welding method between the second sealing member 5 and the pole column body 2 is not limited, and for example, hot melt welding or blaze welding may be used, or, as an example, pulsed laser welding may be used, thereby improving manufacturing efficiency and the degree of automation.

[0169] In some embodiments of this application, electrolyte is injected through the injection passage 2B of the pole body 2, and the electrolyte enters the case 1 of the battery cell 102 from the injection passage 2B. This eliminates the need to provide other auxiliary structures below the injection passage 2B, simplifying the structure and reducing costs. After the injection is complete, first, a first sealing member 4 is placed in the setting hole to achieve a preliminary seal, then a second sealing member 5 is placed in the setting hole, and the second sealing member 5 is welded to the pole body 2 to achieve a firm seal. Alternatively, after the injection is complete, the pole cover plate 3 is directly welded to the pole body 2. Alternatively, after the injection is complete, first, the first sealing member 4 and the second sealing member 5 are placed in the setting hole, the welding of the second sealing member 5 to the pole body 2 is completed, and then the pole cover plate 3 is welded to the pole body 2. Furthermore, if it is necessary to insert the conductive part 72 into the first communication hole 221, first the conductive part 72 is inserted and welded to the conductive part 72 and the pole column body 2, and then the electrolyte is injected.

[0170] In some embodiments of this application, referring to Figure 21, the setting hole includes a first hole portion 241 and a second hole portion 242, that is, in some embodiments, the setting hole includes at least a first hole portion 241 and a second hole portion 242, the first hole portion 241 is located upstream of the second hole portion 242 in the direction of fluid flow, the flow area of ​​the first hole portion 241 gradually decreases or remains unchanged in the direction from the first hole portion 241 to the second hole portion 242, the flow area of ​​the second hole portion 242 gradually decreases or remains unchanged in the direction from the first hole portion 241 to the second hole portion 242, and the flow area at the outlet end of the first hole portion 241 is greater than or equal to the flow area at the inlet end of the second hole portion 242.

[0171] As a result, when the electrolyte is injected into the setting hole, it flows through the first hole 241 and then through the second hole 242. The flow area of ​​the first hole 241 gradually decreases or remains unchanged in the direction from the first hole 241 to the second hole 242, the flow area of ​​the second hole 242 gradually decreases or remains unchanged in the direction from the first hole 241 to the second hole 242, and the flow area at the outlet end of the first hole 241 is greater than or equal to the flow area at the inlet end of the second hole 242. Therefore, the first hole 241 can serve as a temporary storage for the electrolyte, which is advantageous for improving injection efficiency and reducing the risk of electrolyte splashing or overflowing.

[0172] In some embodiments of this application, referring to Figure 23, the setting hole consists of a first hole portion 241 and a second hole portion 242, that is, the setting hole includes only two holes, the first hole portion 241 and the second hole portion 242, the flow area of ​​the first hole portion 241 gradually decreases in the direction from the first hole portion 241 to the second hole portion 242, and the flow area at the outlet end of the first hole portion 241 is equal to the flow area at the inlet end of the second hole portion 242.

[0173] As a result, the setting hole is of the two-segment type, the first hole 241 is almost funnel-shaped, and the side wall of the first hole 241 can have a flow-guiding effect, so that the electrolyte that enters the first hole 241 flows quickly toward the second hole 242, improving the injection efficiency. In addition, since the flow area at the outlet end of the first hole 241 is equal to the flow area at the inlet end of the second hole 242, no stepped surface is formed between the first hole 241 and the second hole 242, and furthermore, by making the first hole 241 funnel-shaped, it becomes difficult for liquid to accumulate in the first hole 241.

[0174] In some embodiments of this application, referring to Figure 24, the setting hole further includes a third hole 243, the third hole 243 located between the first hole 241 and the second hole 242 in the direction of fluid flow, the flow area of ​​the third hole 243 gradually decreases in the direction from the first hole 241 to the second hole 242, the flow area at the inlet end of the third hole 243 is less than or equal to the flow area at the outlet end of the first hole 241, and the flow area at the outlet end of the third hole 243 is equal to the flow area at the inlet end of the second hole 242.

[0175] As a result, when the electrolyte is injected into the designated holes, it first flows through the first hole 241, then through the third hole 243, and finally through the second hole 242. Since the flow area at the inlet end of the third hole 243 is less than or equal to the flow area at the outlet end of the first hole 241, the flow area of ​​the first hole 241 is relatively large, and the first hole 241 can serve as a temporary storage area for the electrolyte, which is advantageous for improving injection efficiency and reducing the risk of electrolyte splashing or overflowing. Furthermore, since the flow area of ​​the third hole 243 gradually decreases from the first hole 241 to the second hole 242, the third hole 243 is almost funnel-shaped, and the side walls of the third hole 243 can have a flow-guiding effect, causing the electrolyte that enters the third hole 243 to flow quickly toward the second hole 242, thereby improving injection efficiency. Furthermore, since the flow path area at the outlet end of the third hole 243 is equal to the flow path area at the inlet end of the second hole 242, no stepped surface is formed between the third hole 243 and the second hole 242. Moreover, by making the third hole 243 funnel-shaped, it becomes difficult for liquid to accumulate in the third hole 243.

[0176] In some embodiments, as shown in Figure 20, the second sealing member 5 may include a central portion 52 and an edge portion 53 surrounding the central portion 52. The central portion 52 is fitted into the setting hole, and the edge portion 53 is overlapped and joined to the portion of the wall of the pole column body 2 away from the housing cavity 1A, thereby creating a sealed connection. This reduces the shape requirements for the setting hole, eliminates the need to thicken the pole column body 2 to process the setting hole into a complex shape, and allows for a thinner pole column body 2. Furthermore, the positioning and fitting of the second sealing member 5 and the pole column body 2 are stable, which is advantageous for improving the stability and reliability of the connection between the second sealing member 5 and the pole column body 2. Additionally, the compact fitting of the second sealing member 5 and the pole column body 2 is advantageous for saving space. Moreover, the overlapping joining and connection of the second sealing member 5 and the pole column body 2 is advantageous for quick connection between the two.

[0177] It should be explained that the configured sealing structure may include only the first sealing member 4, only the second sealing member 5, or both the first sealing member 4 and the second sealing member 5. In each of the above embodiments, if there is no description that the configured sealing structure includes both the first sealing member 4 and the second sealing member 5, it is possible to specifically select, as necessary, whether to provide the first sealing member 4 alone, the second sealing member 5 alone, or both the first sealing member 4 and the second sealing member 5, and this is not limited here.

[0178] It should be explained that in laser welding, there are strict requirements for the cleanliness of the setting hole. If electrolyte remains in the setting hole, the electrolyte will vaporize due to heat, and the resulting waste gas will blow out of the welding pool, causing defects such as pinholes and blowholes at the weld site. The injection hole may consist of a first hole 241 and a second hole 242, that is, the setting hole contains only two holes, the first hole 241 and the second hole 242, and the flow area of ​​the first hole 241 gradually decreases in the direction from the first hole 241 to the second hole 242, and the flow area at the outlet end of the first hole 241 is equal to the flow area at the inlet end of the second hole 242, or the setting hole may further include a third hole 243, and the third hole 243 is in the direction of the flow of the injection fluid between the first hole 241 and the second hole 242. When the third hole 243 is located between the first hole 241 and the second hole 242, and the flow area of ​​the third hole 243 gradually decreases in the direction from the first hole 241 to the second hole 242, and the flow area at the inlet end of the third hole 243 is less than or equal to the flow area at the outlet end of the first hole 241, and the flow area at the outlet end of the third hole 243 is equal to the flow area at the inlet end of the second hole 242, the problem of liquid accumulation in the set hole can be improved, which is advantageous for improving the welding yield and sealing performance between the second sealing member 5 and the pole column body 2.

[0179] In some embodiments of this application, as shown in Figure 6, the case 1 includes a first case wall 11, and the pole column body 2 is provided on the first case wall 11. As shown in Figure 6, the first case wall 11 is integrally molded with at least one second case wall 12, and the second case wall 12 extends toward one side in the thickness direction of the first case wall 11. Alternatively, as shown in Figure 25, the first case wall 11 is an integrally molded cover plate. This enables flexible design of the position of the pole column body 2 and expands the range of application of the battery cell 102 according to the embodiments of this application.

[0180] It should be explained that the second case wall 12 may extend from the edge of the first case wall 11, and if the first case wall 11 is rectangular, the second case wall 12 may extend from at least one of the four edges of the first case wall 11. For example, the second case wall 12 may extend from only one edge of the first case wall 11, or from only two edges of the first case wall 11, or from three edges of the first case wall 11, or from all four edges of the first case wall 11. Exemplarily, if case 1 is a rectangular case, any wall surface of the rectangular case can be the first case wall 11.

[0181] For example, case 1 includes a case body and a lid plate, the case body defining a space with one side open, the lid plate being provided on the open side of the case body, and a housing cavity 1A being formed between the case body and the lid plate. In this case, the wall surface of the case body facing the lid plate may be the first case wall 11, and the wall surface connected between the first case wall 11 and the lid plate may be the second case wall 12, or the wall surface of the case body facing the lid plate may be the second case wall 12, and the wall surface connected between the second case wall 12 and the lid plate may be the first case wall 11, or the lid plate may be the first case wall 11.

[0182] According to some embodiments of this application, with reference to Figures 2 and 26, the application further provides a battery 100 comprising a current collector 103 and battery cells 102 of any of the above-described configurations, wherein there are multiple battery cells 102, and at least two of them are electrically connected via the current collector 103. This enables series and / or parallel connection of multiple battery cells 102. This is advantageous for improving the performance and manufacturability of the battery 100 because the performance and manufacturability of the battery cells 102 according to the embodiments of this application are improved. It should be noted that the battery 100 according to the embodiments of this application may or may not include a box 101.

[0183] For example, when multiple battery cells 102 are connected in series, the anode pole cover plate 3 of one battery cell 102 is connected to the cathode pole cover plate 3 of the next battery cell 102 via a current collector 103, and the cathode pole cover plate 3 of that battery cell 102 is connected to the anode pole cover plate 3 of the previous battery cell 102 via another current collector 103.

[0184] In a third aspect, the embodiments of the present application further provide an electrical device comprising a battery 100 according to any of the above-described solutions.

[0185] According to some embodiments of this application, the application further provides an electrical device comprising a battery 100 of any of the above schemes, wherein the battery 100 is for supplying electrical energy to the electrical device. The electrical device may be any of the above-described equipment or systems to which the battery 100 is applied. The improved performance of the battery 100 is advantageous for improving the operating power performance of the electrical device.

[0186] The following describes a battery cell 102 according to one specific embodiment of this application.

[0187] Referring to Figures 3 to 6, the battery cell 102 comprises a case 1, a pole body 2, a pole cover plate 3, and a cell assembly 7. The case 1 defines a housing cavity 1A, the pole body 2 is provided in the case 1, and the pole body 2 has a liquid injection passage 2B for connecting the housing cavity 1A and the outside of the case 1. The liquid injection passage 2B includes a first housing groove 211 and a liquid passage hole 23. The groove opening of the first housing groove 211 opens away from the housing cavity 1A. The pole body 2 has a communication hole 22 that connects the first housing groove 211 and the housing cavity 1A. There is one or more communication holes 22, at least one of which is a liquid passage hole 23. The pole cover plate 3 is a cover plate without holes, provided to cover the pole body 2, and is for sealing the groove opening of the first housing groove 211.

[0188] The cell assembly 7 includes an active material coated section 71 and a conductive section 72. The active material coated section 71 is housed in a housing cavity 1A, and the conductive section 72 is connected to the active material coated section 71 and the pole body 2. At least a portion of the conductive section 72 is inserted through at least one communication hole 22 so as to be housed in a first housing groove 211, and the portion of the conductive section 72 located in the first housing groove 211 is welded to the pole body 2.

[0189] During the manufacturing of the battery cell 102, first, the conductive part 72 is inserted through the communication hole 22 in the pole body 2, and welding is performed between the conductive part 72 and the pole body 2. Next, electrolyte is injected into the first housing groove 211, and the electrolyte injected into the first housing groove 211 enters the case 1 through the liquid passage hole 23. After the injection is complete, the pole cover plate 3 is capped and welded to the pole body 2 to achieve a tight seal.

[0190] It should be noted that, insofar as it does not create a contradiction, the embodiments and features described herein can be combined with each other.

[0191] The foregoing describes preferred embodiments of this application and does not limit it. Those skilled in the art can modify and alter this application in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application shall all be within the scope of protection of this application. [Explanation of Symbols]

[0192] 1000 vehicles X 1st direction Y Second direction Z 3rd direction 100 batteries 200 controllers 300 motor 101 Boxes 1011 Main body of the first box 1012 Second Box Main Unit 102 battery cells 1 case 1A Enclosure Cavity 11 Case 1 Wall 12. Case 2 Wall 2 pole pole body 2B Liquid injection passage 21 Retaining groove 211 First storage groove 212 Second storage groove 213 Third storage groove 22 Communication hole 221 1st communication hole 222 2nd communication hole 23 Liquid passage hole 24 Injection hole 24a Liquid inlet end 24b Liquid outlet end 241 1st hole 242 2nd hole 243 3rd hole 25 counterbore grooves 26 Fitting gap 271 External fastening part 272 Internal stopper 28 Through holes 1023 Sealing Gasket 1024 Insulating Gasket 1025 1st sealed structure 1026 Second sealed structure 3 pole cover plate 32 Overlapping joint 4. First sealing member 5. Second sealing member 51 Extension part 52 Central part 53 Edge section 54 Avoidance part 55 Avoidance Cavity 7-cell assembly 71 Active material coated section 72 Conductive part 103 Current collector

Claims

1. A case that defines the containment cavity, A battery cell comprising a pole body provided in the case, having a liquid injection passage formed therein for connecting the housing cavity with the outside of the case, the liquid injection passage including a housing groove and a through hole penetrating the groove wall of the housing groove.

2. The battery cell according to claim 1, wherein the housing groove includes a first housing groove having a groove opening that opens away from the housing cavity, and the through hole includes a liquid passage hole that penetrates the groove wall of the first housing groove on the side closer to the housing cavity.

3. The battery cell according to claim 2, wherein the housing groove further includes a second housing groove having a groove opening that opens in the direction of the housing cavity, the second housing groove is located on the side of the first housing groove closer to the housing cavity, and the liquid passage hole penetrates the groove wall on the side of the second housing groove away from the housing cavity, thereby connecting the first housing groove and the second housing groove.

4. The battery cell according to claim 2 or 3, comprising a cell assembly including an active material coated portion housed in the housing cavity and a conductive portion connected to the active material coated portion, wherein the pole body has a communication hole formed therein that connects the first housing groove and the housing cavity, there is one or more communication holes, at least one of which is the liquid passage hole, and the conductive portion is inserted through at least one of the communication holes such that at least a part of it is housed in the first housing groove.

5. The battery cell according to claim 4, wherein the communication hole through which the conductive portion is inserted is a first communication hole, and the first communication hole is the liquid passage hole.

6. The battery cell according to claim 4, wherein the communication hole through which the conductive portion is inserted is a first communication hole, and the communication holes are plurality, further including at least one second communication hole through which the conductive portion is not inserted, and at least the second communication hole is the liquid passage hole.

7. The battery cell according to any one of claims 4 to 6, wherein the pole column body is formed as an elongated structure, and the communication hole through which the conductive part is inserted is formed as an elongated hole whose length direction extends from one end to the other of the length of the pole column body.

8. The battery cell according to claim 2 or 3, comprising a cell assembly including an active material coated portion housed in the housing cavity and a conductive portion connected to the active material coated portion, wherein the pole column body has a communication hole formed therein that connects the first housing groove and the housing cavity, the communication hole is one or more, at least one of which is the liquid passage hole, and the conductive portion is connected to the wall surface of the pole column body facing the housing cavity.

9. The battery cell according to any one of claims 2 to 8, wherein the pole column body is formed as an elongated structure, and the first housing groove is formed as an elongated groove whose length direction extends from one end to the other of the length of the pole column body.

10. The battery cell according to any one of claims 2 to 9, wherein the groove opening of the first housing groove is enlarged in diameter.

11. The battery cell according to any one of claims 2 to 10, further comprising a pole column cover plate provided so as to cover the pole column body and sealing the groove opening of the first housing groove.

12. The battery cell according to claim 11, wherein at least a portion of the pole column cover plate is fitted into the first housing groove.

13. The battery cell according to claim 11 or 12, wherein the edge of the pole column cover plate has an overlapping joint portion that is overlapped and joined to the side of the pole column body away from the housing cavity.

14. The pole column body has a counterbore groove on the surface away from the housing cavity that surrounds the first housing groove, and at least a portion of the overlapping joint is fitted into the counterbore groove, as described in claim 13.

15. A battery cell according to claim 14, wherein there is a fitting gap between the overlapping joint and the side wall of the counterbore groove, and the size of one end of the fitting gap away from the housing cavity is less than 0.05 mm.

16. The battery cell according to any one of claims 2 to 15, further comprising a first sealing structure for sealing the liquid passage hole.

17. The battery cell according to claim 1, wherein the housing groove includes a third housing groove having a groove opening that opens in the direction of the housing cavity, and the through hole includes an injection hole that penetrates the groove wall of the third housing groove on the side away from the housing cavity.

18. The battery cell according to claim 17, wherein the flow path area at the liquid inlet end of the injection hole is larger than the flow path area at the liquid outlet end of the injection hole.

19. The battery cell according to claim 17 or 18, further comprising the second sealing structure for sealing the injection hole.

20. A battery cell according to any one of claims 17 to 19, comprising a cell assembly including an active material coated portion housed in the housing cavity and a conductive portion connected to the active material coated portion, wherein at least a portion of the conductive portion is housed in a third housing groove and connected to the groove wall of the third housing groove on the side away from the housing cavity.

21. The battery cell according to any one of claims 1 to 20, wherein the case includes a first case wall, the pole body is provided on the first case wall, and the first case wall is a lid plate integrally molded or is integrally molded with at least one second case wall extending toward one side in the thickness direction of the first case wall.

22. A battery comprising a current collector and a battery cell according to any one of claims 1 to 21, wherein there are multiple battery cells, and at least two of them are electrically connected via the current collector.

23. An electrical device comprising the battery described in claim 22.

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