Injection nozzle, injection device, battery cell, battery and power consumption device

Abstract

A liquid injection nozzle, a liquid injection device, a battery cell, a battery, and a power consumption device, which belong to the battery technical field, wherein the liquid injection nozzle includes an expanding segment, and a fluid passage area of ​​the liquid injection nozzle increases in the expanding segment along a direction from an inlet end of the liquid injection nozzle to an outlet end of the liquid injection nozzle.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is based on and claims priority from a Chinese patent application having application number 202322279976.4 and filing date 2023-08-23, the entire contents of which are hereby incorporated by reference into this application.

[0002] The present application relates to the field of battery technology, and in particular to a liquid injection nozzle, a liquid injection device, a battery cell, a battery, and a power consuming device. [Background technology]

[0003] In recent years, new energy vehicles have been developing rapidly, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. Here, power batteries include multiple battery cells, but the manufacturing efficiency of battery cells is relatively low and needs to be improved. Summary of the Invention

[0004] The embodiments of the present application provide a liquid injection nozzle, a liquid injection device, a battery cell, a battery, and a power consumption device that can improve the manufacturing efficiency of battery cells.

[0005] According to a first aspect, an embodiment of the present application provides a liquid injection nozzle, the liquid injection nozzle including an expanding segment, wherein a fluid passage area of ​​the liquid injection nozzle increases in the expanding segment along a direction from an inlet end of the liquid injection nozzle toward an outlet end of the liquid injection nozzle.

[0006] In the above technical solution, when the electrolyte flows through the injection nozzle, it passes through the enlarged segment, which is advantageous to improve injection efficiency, shorten the injection time, and improve the manufacturing efficiency of battery cells.

[0007] In some embodiments, the fluid passage area at the inlet end of the injection nozzle is smaller than the fluid passage area at the outlet end of the injection nozzle.

[0008] In the above technical solution, the fluid passage area at the outlet end of the injection nozzle is larger than that at the inlet end, which effectively increases the injection area, improves injection efficiency, shortens injection time, and improves battery cell production efficiency. Furthermore, the injection nozzle in the embodiment of the present application has a fluid passage area at the outlet end larger than that at the inlet end, which corresponds to an outlet flare type, with a smaller outlet resistance and no need for positive pressure during the injection process, which is advantageous in reducing the risk of liquid injection.

[0009] In some embodiments, the expanding segment is formed with a gradually expanding shape in which the fluid passing area gradually increases along a direction from the inlet end toward the outlet end.

[0010] In the above technical solution, the expanding segments are configured in a gradually expanding manner, which is advantageous in improving the flow characteristics of the electrolyte flowing through the expanding segments and reducing the flow resistance loss.

[0011] In some embodiments, the injection nozzle includes a gradually converging segment, the gradually converging segment being located away from the inlet end of the diverging segment, a fluid passage area of ​​the gradually converging segment gradually decreasing along a direction from the inlet end toward the outlet end, and the smallest cross-sectional end of the gradually converging segment forming the outlet end.

[0012] In the above technical solution, the outlet position of the injection nozzle is set to be slightly closed, thereby fitting the injection nozzle and the injection port, thereby solving the problem of conductive particles being formed due to friction and collision between the injection nozzle and the injection port of the battery cell, and making it easier to reduce the risk of conductive particles entering the case through the injection port and causing reliability problems in the battery core assembly, which is advantageous for improving the reliability of the battery cell.

[0013] In some embodiments, the fluid-passing area of ​​the smallest cross-sectional end of the gradually converging segment is greater than the fluid-passing area of ​​the smallest cross-sectional end of the diverging segment, and the axial length of the gradually converging segment is less than the axial length of the diverging segment.

[0014] The above technical solution is not only advantageous in obtaining a relatively large flare range, but also advantageous in improving the injection efficiency, shortening the injection time, and improving the production efficiency of battery cells. It is also advantageous in that the outlet end of the injection nozzle and the injection port are fitted together, which solves the problem of conductive particles being formed due to friction and collision between the injection nozzle and the injection port of the battery cell, and reduces the risk of conductive particles entering the case through the injection port and causing reliability problems in the battery core assembly, thereby advantageous in improving the reliability of the battery cell.

[0015] In some embodiments, the injection nozzle includes a first constant cross-section segment, the first constant cross-section segment is connected between the expanding segment and the gradually contracting segment, and a fluid passage area of ​​the first constant cross-section segment is equal to a fluid passage area of ​​a maximum cross-sectional end of the gradually contracting segment and a fluid passage area of ​​a maximum cross-sectional end of the expanding segment, respectively, and an axial length of the first constant cross-section segment is greater than an axial length of the gradually contracting segment.

[0016] In the above technical solution, the axial length of the segment of the injection nozzle with a relatively large fluid passage area is relatively long, which can more effectively improve the injection efficiency, shorten the injection time, and improve the production efficiency of battery cells.

[0017] In some embodiments, the outer wall of the tapered segment is a smoothly curved surface.

[0018] In the above technical solution, when the filling nozzle and the filling port are mated, the friction and collision between the tapered segment and the filling port of the battery cell can be further reduced, and the problem of conductive particles falling into the filling port can be further reduced, which is advantageous for further improving the reliability of the battery cell.

[0019] In some embodiments, the injection nozzle includes a second constant cross-section segment, the second constant cross-section segment is connected to the side of the expanding segment remote from the outlet end, and the fluid passage area of ​​the second constant cross-section segment is equal to the fluid passage area of ​​the smallest cross-section end of the expanding segment, and the end of the second constant cross-section segment remote from the expanding segment constitutes the inlet end.

[0020] In the above technical solution, the structure of the injection nozzle is simple, and the injection nozzle can be easily connected to the electrolyte supply passage of the injection device.

[0021] In some embodiments, the outlet end of the injection nozzle is elongated.

[0022] The above technical solution is advantageous for increasing the outlet end area and simultaneously reducing the size occupied by the outlet end of the injection nozzle in multiple directions, allowing the injection nozzle to fit relatively thin battery cells, improving the adaptability of the injection nozzle, making full use of the space above the battery cells, and increasing the area of ​​the outlet end of the injection nozzle as much as possible.

[0023] In some embodiments, the cross-sectional shape of the enlarged segment matches the shape of the outlet end of the injection nozzle.

[0024] The above technical solution is advantageous for the gradual change and gentle transition of the shape of the injection nozzle, which is advantageous for improving the flow performance of the electrolyte in the injection nozzle.

[0025] According to a second aspect, the embodiment of the present application further provides a liquid injection device, which includes the liquid injection nozzle of any one of the above solutions.

[0026] The above technical solution can improve the injection efficiency and shorten the injection time.

[0027] According to a third aspect, an embodiment of the present application further provides a battery cell, the battery cell including a case assembly, a receiving cavity within the case assembly, and a liquid filling port on the case assembly communicating with the receiving cavity, the battery cell employing any one of the above-mentioned liquid filling nozzles for filling liquid into the receiving cavity through the liquid filling port.

[0028] In the above technical solution, the injection nozzle according to the embodiment of the present application is used for injection, which can improve the injection efficiency and thereby shorten the manufacturing process of the battery cell.

[0029] In some embodiments, the shape of the inlet matches the shape of the outlet end of the inlet nozzle.

[0030] In the above technical solution, the size of the injection port is fully utilized and the size of the outlet end of the injection nozzle is made as large as possible, thereby improving the injection efficiency, and the shape of the injection port matches the shape of the outlet end of the injection nozzle, which is advantageous in improving the problem of liquid leakage.

[0031] In some embodiments, the outlet end of the fill nozzle is adapted to fit within the fill port.

[0032] In the above technical solution, the injection port functions to stop and surround the outlet end of the injection nozzle, improving the fitting stability between the injection nozzle and the injection port and reducing the probability of leakage during the injection process.

[0033] In some embodiments, the case assembly has a storage groove with a notch that opens in a direction away from the storage cavity, and the case assembly further has a liquid passage hole that connects the storage groove to the storage cavity, and the notch in the storage groove forms a liquid inlet.

[0034] In the above technical solution, the receiving groove serves to cache the electrolyte, thereby alleviating problems such as electrolyte splashing and overflow. The side walls of the receiving groove can prevent electrolyte splashing to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Furthermore, the notch of the receiving groove has a relatively large area compared to the punch shape, which is advantageous for increasing the area of ​​the injection port, thereby advantageous for enlarging the outlet end of the injection nozzle, thereby advantageous for further improving injection efficiency.

[0035] In some embodiments, the cross section of the notch segment of the receiving groove gradually increases along a direction away from the receiving cavity.

[0036] In the above technical solution, the notch segments of the accommodating groove are flared, which further reduces the problem of electrolyte overflowing from the accommodating groove. Furthermore, when the outlet end of the injection nozzle is configured to be fitted into the injection port, by setting the notch segments of the accommodating groove to be flared, the injection nozzle can be easily inserted into the notch segments of the accommodating groove, thereby improving the installation efficiency before injection.

[0037] In some embodiments, the case assembly includes a case and a post structure, the case defining the receiving cavity, the post structure being disposed on the case, and the pour port being disposed on the post structure.

[0038] In the above technical solution, a filler hole is provided on the post structure to allow electrolyte to be injected into the receiving cavity, enabling electrolyte to be injected through the post structure. This eliminates the need for a separate filler hole on the battery cell case. Therefore, the filler hole does not occupy any space in the case. The post structure does not need to be downsized to accommodate the filler hole. This increases the area and fluid flow area of ​​the post structure without increasing the case size, reducing fluid flow resistance and improving the fluid flow efficiency of the battery cell. This is beneficial for increasing the area of ​​the post structure and for assembling and connecting the post structure to the case. Furthermore, since the case size does not need to be increased to accommodate the increase in the area of ​​the post structure, this is beneficial for achieving a smaller and lighter case. Furthermore, since the case does not need to be specially processed to create a separate filler hole on the battery cell case, this is beneficial for reducing the structural complexity and processing difficulty of the case. Furthermore, there is no need to thicken localized areas of the case to weld sealing nails onto it, which further simplifies the structure and processing of the case, and there is no need to thicken the entire case to weld sealing nails onto it, which is advantageous for meeting the requirement for a thinner case, improving the energy density of the battery cell, and reducing the weight and material costs of the case. Furthermore, by locating the filling port on the post structure, the manufacturing and processing of the filling port is simplified, and the size, shape, etc. of the filling port can be relatively easily met to meet design requirements and application demands, which is advantageous for reducing the difficulty and processing costs of the filling port.

[0039] In some embodiments, the case assembly includes a case and a post structure, the case defining a receiving cavity, the post structure including a post body and a post cover plate, the post body attached to the case, the receiving groove and the liquid passage hole both formed on the post body, and the post cover plate covering a notch in the receiving groove.

[0040] In the above technical solution, before the electrolyte is poured, the post cover plate can be left unattached, leaving the notch of the receiving groove open, or a pouring nozzle can be used to pour the electrolyte into the notch of the receiving groove. After the electrolyte is poured, the post cover plate can be used to seal the notch of the receiving groove, thereby avoiding the problem of electrolyte leakage from the notch of the receiving groove and improving the reliability of the battery cell. Here, the post cover plate covers the notch of the receiving groove, making it easier to assemble and connect the post cover plate and the post body.

[0041] In some embodiments, the post body is elongate and the receiving groove is formed in an elongate groove that extends longitudinally from one end of the post body to the other end of the post body.

[0042] The above technical solution makes full use of the space in the post body to increase the size of the receiving groove, which is advantageous for improving the injection efficiency. For example, by setting the outlet end of the injection nozzle to match the notch shape of the receiving groove, it is advantageous for further improving the injection efficiency.

[0043] In some embodiments, the battery cell includes a battery core assembly, the battery core assembly including an active material coating portion accommodated in the accommodating cavity and a conductive portion connected to the active material coating portion, and a communication hole communicating the accommodating groove and the accommodating cavity is formed on the post body, the communication hole is one or more, and at least one of the communication holes is a liquid passage hole, and the conductive portion is drilled in the at least one communication hole so as to be at least partially accommodated in the accommodating groove.

[0044] In the above technical solution, by accommodating at least a portion of the conductive part in the accommodating groove, at least a portion of the conductive part occupies the space in the accommodating groove, thereby reducing the space occupied by the conductive part in the accommodating cavity, and saving the space in the accommodating cavity to accommodate a larger volume of active material coating part, which is advantageous for improving the energy density of the battery cell, or for reducing the size of the battery cell when the energy density of the battery cell remains unchanged.

[0045] According to a fourth aspect, the embodiments of the present application further provide a battery, which includes a busbar member and a battery cell according to any one of the above solutions, wherein the battery cells are multiple, and at least two of the battery cells are electrically connected via the busbar member.

[0046] The above technical solution improves the manufacturing efficiency of the battery cell according to the embodiment of the present application, which is advantageous to improve the manufacturing efficiency of the battery and reduce the manufacturing cost of the battery.

[0047] According to a fifth aspect, an embodiment of the present application further provides a power consumption device, which includes the battery of any one of the above solutions.

[0048] The above technical solution is advantageous in reducing the manufacturing cost of the battery, and therefore the usage cost of the power consuming device. [Brief explanation of the drawings]

[0049] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present application, and should not be considered as limiting the scope. Those skilled in the art can also derive other related drawings based on these drawings without exerting any creative efforts. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery according to some embodiments of the present application. FIG. [Figure 3] 1 is a structural schematic diagram of a battery cell according to some embodiments of the present application; [Figure 4] 1 is a cross-sectional schematic view of an injection nozzle according to some embodiments of the present application. FIG. [Figure 5] FIG. 5 is a schematic diagram of the fitting of the liquid injection nozzle and the battery cell shown in FIG. [Figure 6] FIG. 5 is a left side view of the liquid injection nozzle shown in FIG. [Figure 7] FIG. 5 is a bottom view of the liquid injection nozzle shown in FIG. [Figure 8] FIG. 1 is an orthographic schematic diagram of a battery cell according to some embodiments of the present application. [Figure 9] FIG. 9 is a cross-sectional view taken along line NN in FIG. [Figure 10] FIG. 10 is a locally enlarged view of FIG. 9. [Figure 11] 1 is a cross-sectional schematic view of a battery cell according to some embodiments of the present application. [Figure 12] 10A-10C are schematic diagrams of mating between a post body and a conductive portion according to some embodiments of the present application. [Figure 13] 10A-10C are schematic diagrams of mating between a post body and a conductive portion according to some embodiments of the present application. [Figure 14] 1 is a schematic diagram of a mating between a battery cell and a busbar member according to some embodiments of the present application. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0050] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the following will clearly describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts fall within the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art of this application, and the terms used in the specification of this application are only for describing specific embodiments and are not intended to limit this application, and the terms "comprises," "has," and any variations thereof in the specification and claims of this application and the above drawings are intended to cover a non-exclusive "comprise." The terms "first," "second," etc. in the specification and claims of this application or the above drawings are not intended to describe a specific order or a hierarchical relationship, but are intended to distinguish different objects.

[0052] An "embodiment" referred to in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, separate, or alternative embodiments of other embodiments.

[0053] In the description of this application, it should be explained that unless otherwise clearly defined or limited, the terms "attached," "connected," "joined," and "attached" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0054] The term "and / or" in this application merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this application generally indicates that the related objects before and after are in an "or" relationship.

[0055] In the embodiments of the present application, the same reference numerals represent the same elements, and for the sake of brevity, detailed descriptions of the same elements will be omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various elements in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitations on the present application.

[0056] The term "plurality" as used herein refers to two or more (including two).

[0057] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium-lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may have a cylindrical, flat, rectangular, or other shape, etc., but the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on packaging method: cylindrical battery cells, rectangular battery cells, and pouch battery cells, but the embodiments of this application are not limited thereto.

[0058] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a housing for packaging one or more battery cells or one or more battery modules. The housing can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0059] The battery cell includes a case, a battery core assembly, and an electrolyte, and the case is used to accommodate the battery core assembly and the electrolyte. The battery core assembly includes at least one electrode assembly, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The electrode assembly may have a wound structure or a stacked structure. The battery cell operates mainly through the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0060] The positive electrode plate generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer being called a positive electrode tab. For example, in a lithium-ion battery, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.

[0061] The negative electrode plate generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated directly or indirectly on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer being 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, silicone, or the like.

[0062] To ensure that they do not melt even when a large current flows, multiple positive electrode tabs are stacked to form a positive electrode tab portion, and multiple negative electrode tabs are stacked to form a negative electrode tab portion. Posts are provided on the case, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be welded to the post to form a direct electrical connection between the tab portion and the post. Alternatively, for example, the battery core assembly may include an adapter, and the tab portion is welded to the adapter, and the adapter is welded to the post to form an indirect electrical connection between the tab portion and the post.

[0063] The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

[0064] During the battery cell manufacturing process, electrolyte must be injected into the case. To facilitate this process, a filling port is typically opened on the case, and the electrolyte is poured into the filling port through a filling nozzle. To prevent leakage of the injected electrolyte, the filling nozzle is typically tubular with a pointed bottom, with the pointed end inserted into the filling port. However, the filling efficiency of such a filling nozzle is relatively low, and the filling time is relatively long, which affects the production efficiency of battery cells. Furthermore, the filling nozzle in the related art is tubular with a pointed bottom, i.e., has a closed outlet, which creates a relatively large resistance to the electrolyte flowing out of the filling nozzle. Furthermore, positive pressure is required during the filling process, which creates a risk of liquid spraying.

[0065] To address the above technical problems, the present application proposes a liquid injection nozzle, and the liquid injection nozzle in the embodiment of the present application is configured to include an expanding segment, and the fluid passage area of ​​the liquid injection nozzle increases in the expanding segment from the inlet end of the liquid injection nozzle to the outlet end of the liquid injection nozzle, i.e., the inlet area of ​​the expanding segment is smaller than the outlet area of ​​the expanding segment, and for example, the expanding segment may be of a gradually expanding or stepwise expanding type. In this way, when the electrolyte flows through the liquid injection nozzle, it passes through a flow path segment that expands suddenly or gradually, which is advantageous for improving liquid injection efficiency and shortening the liquid injection production time, and also reduces the passage resistance in the expanding segment, eliminating the need for positive pressure during the liquid injection process and advantageous for reducing the risk of liquid spraying.

[0066] An embodiment of the present application provides a power-consuming device that uses a battery as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, and an electric plane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0067] For convenience of explanation, the following embodiment will be described by taking an example in which the power consumption device of one embodiment of the present application is a vehicle 1000.

[0068] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, etc. The battery 100 may be installed inside the vehicle 1000, or may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 1000 to power the motor 300, for example, for starting the vehicle 1000, navigation, and operating power consumption needs during driving.

[0069] In some embodiments of the present application, the battery 100 may be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, providing driving power to the vehicle 1000 in place of or in place of fuel oil or natural gas.

[0070] Referring to FIG. 2, FIG. 2 is a structural exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a housing 101 and a plurality of battery cells 102, which are housed within the housing 101. Here, the housing 101 is used to provide an assembly space for the battery cells 102, and the housing 101 may adopt various structures. In some embodiments, the housing 101 may include a first box body 1011 and a second box body 1012, which are fitted over each other and which collectively define an assembly space for housing the battery cells 102. The second box body 1012 may have a hollow structure with one end open, and the first box body 1011 may have a plate-like structure, and the first box body 1011 is placed over the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space, and the first box body 1011 and the second box body 1012 may both have a hollow structure with one end open, and the open side of the first box body 1011 is placed over the open side of the second box body 1012. Of course, the housing 101 formed by the first box body 1011 and the second box body 1012 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0071] In the battery 100, the multiple battery cells 102 may be connected in series, parallel, or series-parallel, where series-parallel connection means that the multiple battery cells 102 are connected in both series and parallel. The multiple battery cells 102 may be directly connected in series, parallel, or series-parallel, and the entire battery cell set may be housed within the housing 101. Of course, the battery 100 may first connect the multiple battery cells 102 in series, parallel, or series-parallel to form a battery module, and then connect the multiple battery modules in series, parallel, or series-parallel to form a whole battery set housed within the housing 101. The battery 100 may further include other structures, for example, the battery 100 may further include bus bar members for achieving electrical connection between the multiple battery cells 102.

[0072] Here, each battery cell 102 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 102 may be cylindrical, flat, rectangular, or the like. For example, referring to the embodiment shown in FIG. 3 , the longitudinal direction of the battery cell 102 is a first direction X, the width direction of the battery cell 102 is a second direction Y, and the height direction of the battery cell 102 is a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other two by two.

[0073] According to some embodiments of the present application, referring to FIG. 4 , the injection nozzle 9 includes an expansion segment 92, and the fluid passage area of ​​the injection nozzle 9 increases in the expansion segment 92 along a direction from the inlet end 9 a of the injection nozzle 9 to the outlet end 9 b of the injection nozzle 9, i.e., the inlet area of ​​the expansion segment 92 is smaller than the outlet area of ​​the expansion segment 92, and for example, the expansion segment 92 may be of a gradually expanding type or a step-expanding type.

[0074] In the above technical solution, the injection nozzle 9 includes an expanding segment 92, and therefore the injection flow path 91 within the injection nozzle 9 includes flow path segments whose area increases abruptly or gradually, and when the electrolyte flows through the injection nozzle 9, it passes through the flow path segments whose fluid passage area increases abruptly or gradually, which is advantageous for improving injection efficiency and shortening the injection production time, and also for reducing the passage resistance in the expanding segment 92, which eliminates the need for positive pressure during the injection process and is advantageous for reducing the risk of liquid spraying. Of course, if positive pressure needs to be applied in some cases, it may be applied, and this is not a limitation herein.

[0075] 4 , according to some embodiments of the present application, the fluid passage area of ​​the inlet end 9a of the liquid injection nozzle 9 is smaller than the fluid passage area of ​​the outlet end 9b of the liquid injection nozzle 9. In other words, a liquid injection flow path 91 is defined within the liquid injection nozzle 9, and the inlet area of ​​the liquid injection flow path 91 is smaller than the outlet area of ​​the liquid injection flow path 91.

[0076] 4 and 5 , for example, the inlet end 9 a of the injection nozzle 9 is connected to the electrolyte supply passage of the injection device, and the outlet end 9 b of the injection nozzle 9 is directly abutted against the injection port 1029 on the battery cell 102, so that the injection device can transport the electrolyte into the injection passage of the injection nozzle 9 through the supply passage, and the electrolyte entering the injection passage can be injected into the case 1 of the battery cell 102 through the injection port 1029.

[0077] Here, because the fluid passage area of ​​the outlet end 9b of the injection nozzle 9 is relatively larger than that of the inlet end 9a, the injection area can be effectively increased, improving injection efficiency, shortening the injection time, and improving the production efficiency of the battery cells 102. Furthermore, because the fluid passage area of ​​the outlet end 9b of the injection nozzle 9 in the embodiment of the present application is relatively larger than that of the inlet end 9a, it corresponds to an outlet flare type, with relatively small outlet resistance and no need to apply positive pressure during the injection process, which is advantageous in reducing the risk of liquid spraying.

[0078] 4 , in some embodiments of the present application, the expansion segment 92 is formed in a gradually expanding shape, in which the fluid passage area gradually increases in the direction from the inlet end 9 a to the outlet end 9 b. By configuring the expansion segment 92 in a gradually expanding form, it is advantageous to improve the flow characteristics of the electrolyte flowing through the expansion segment 92 and reduce flow resistance losses. Of course, the present application is not limited thereto. For example, the expansion segment 92 may be configured in a stepped expansion form. For example, the expansion segment 92 may include multiple equal-cross-section segments with different areas that are arranged in order from smallest to largest in the direction from the inlet end 9 a to the outlet end 9 b, thereby achieving a stepped expansion effect.

[0079] 4 , in some embodiments of the present application, the injection nozzle 9 includes a gradually contracting segment 93, which is located on the side away from the inlet end 9 a of the expanding segment 92, the fluid passage area of ​​the gradually contracting segment 93 gradually decreasing in the direction from the inlet end 9 a to the outlet end 9 b, and the end with the smallest cross section of the gradually contracting segment 93 forming the outlet end 9 b. By setting the outlet position of the injection nozzle 9 in a slightly closed manner, the injection nozzle 9 and the injection port 1029 are fitted together, which alleviates the problem of conductive particles being generated due to friction and collision between the injection nozzle 9 and the injection port 1029 of the battery cell 102, and facilitates reducing the risk of conductive particles entering the case 1 through the injection port 1029 and causing reliability problems in the battery core assembly 7, which is advantageous to improving the reliability of the battery cell 102.

[0080] 4 , for example, the outer wall of the gradually reducing segment 93 is a smoothly curved surface, i.e., the longitudinal section of the gradually reducing segment 93 is an arc or an approximately arc, thereby further reducing friction and collision between the gradually reducing segment 93 and the position of the inlet 1029 of the battery cell 102 when the filling nozzle 9 and the inlet 1029 are fitted together, and further reducing the problem of conductive particles falling into the inlet 1029, which is advantageous for further improving the reliability of the battery cell 102.

[0081] For example, the outer wall of the expansion segment 92 may be a smoothly curved surface or a slope, i.e., the longitudinal cross section of the expansion segment 92 may be a slope, a circular arc, or an approximately circular arc, etc., thereby enabling flexible design.

[0082] In some embodiments of the present application, as shown in FIG. 4 , the fluid passage area of ​​the smallest cross-sectional end of the gradually converging segment 93 is larger than the fluid passage area of ​​the smallest cross-sectional end of the expanding segment 92, and the axial length L3 of the gradually converging segment 93 is smaller than the axial length L2 of the expanding segment 92.

[0083] For example, the injection nozzle 9 extends from the inlet to the outlet in a top-to-bottom direction, the expanding segment 92 is located above the gradually contracting segment 93, the expanding segment 92 gradually increases or increases in steps from top to bottom, the gradually contracting segment 93 gradually decreases from top to bottom, the upper end of the expanding segment 92 is its smallest cross-sectional end, the lower end of the gradually contracting segment 93 is its smallest cross-sectional end, the area of ​​the lower end of the gradually contracting segment 93 is larger than the area of ​​the upper end of the expanding segment 92, and the height of the expanding segment 92 in the vertical direction is larger than the height of the gradually contracting segment 93 in the vertical direction.

[0084] This is advantageous for obtaining a relatively large flare range, thereby improving the injection efficiency, shortening the injection time, and improving the production efficiency of the battery cell 102. It is also advantageous for fitting the outlet end 9b of the injection nozzle 9 with the injection port 1029, thereby solving the problem of conductive particles being formed due to friction and collision between the injection nozzle 9 and the injection port 1029 of the battery cell 102, and reducing the risk of conductive particles entering the case 1 through the injection port 1029 and causing reliability problems for the battery core assembly 7, thereby improving the reliability of the battery cell 102.

[0085] In some embodiments of the present application, as shown in FIG. 4 , the liquid injection nozzle 9 includes a first constant cross-section segment 94, which is connected between the expanding segment 92 and the gradually contracting segment 93, and the fluid passage area of ​​the first constant cross-section segment 94 is equal to the fluid passage area of ​​the maximum cross-sectional end of the gradually contracting segment 93 and the fluid passage area of ​​the maximum cross-sectional end of the expanding segment 92, respectively, and the axial length L4 of the first constant cross-section segment 94 is greater than the axial length L3 of the gradually contracting segment 93. For example, the expanding segment 92, the first constant cross-section segment 94, and the gradually contracting segment 93 are arranged in this order from top to bottom, the fluid passage area of ​​the expanding segment 92 increases from top to bottom, and the fluid passage area of ​​the gradually contracting segment 93 decreases from top to bottom, the fluid passage area at the upper end of the first constant cross-section segment 94 is equal to the fluid passage area at the upper end of the gradually contracting segment 93 and the fluid passage area at the lower end of the expanding segment 92, respectively, and the vertical height of the first constant cross-section segment 94 is greater than the vertical height of the gradually contracting segment 93. As a result, the axial length of the segment of the liquid injection nozzle 9 with a relatively large fluid passage area is relatively long, which more effectively improves liquid injection efficiency, shortens the liquid injection time, and improves the production efficiency of the battery cells 102.

[0086] In some embodiments of the present application, the liquid injection nozzle 9 includes a second constant cross-section segment 95, which is connected to the side of the expanded segment 92 remote from the outlet end 9b, and the fluid passage area of ​​the second constant cross-section segment 95 is equal to the fluid passage area of ​​the smallest cross-section end of the expanded segment 92, and the end of the second constant cross-section segment 95 remote from the expanded segment 92 constitutes the inlet end 9a of the liquid injection nozzle 9. For example, the second constant cross-section segment 95 and the expanded segment 92 are installed in order from top to bottom, and the fluid passage area of ​​the expanded segment 92 increases from top to bottom, the fluid passage area of ​​the second constant cross-section segment 95 is equal to the fluid passage area of ​​the upper end of the expanded segment 92, and the upper end of the second constant cross-section segment 95 constitutes the inlet end 9a of the liquid injection nozzle 9. This simplifies the structure of the liquid injection nozzle 9 and facilitates connection of the liquid injection nozzle 9 to the electrolyte supply passage of the liquid injection device.

[0087] Of course, the present application is not limited thereto, and for example, in other embodiments of the present application, at least one of the first constant cross-section segment 94, the second constant cross-section segment 95, and the gradually decreasing segment 93 may be canceled.

[0088] 4, 6, and 7, in some embodiments of the present application, the outlet end 9b of the injection nozzle 9 is formed in an elongated shape, i.e., the length of the outlet end 9b of the injection nozzle 9 is greater than the width, which is advantageous for increasing the area of ​​the outlet end 9b and simultaneously reducing the size occupied by the outlet end 9b of the injection nozzle 9 in multiple directions, and for fitting the injection nozzle 9 with a relatively thin battery cell 102, improving the adaptability of the injection nozzle 9, making full use of the space above the battery cell 102, and maximizing the area of ​​the outlet end 9b of the injection nozzle 9. For example, the outlet end 9b of the injection nozzle 9 is formed in a rectangular, oval, or elliptical shape. Here, the oval shape may be referred to as a runway shape, i.e., formed by stitching semicircles on both ends of the longer side of a rectangle.

[0089] For example, as shown in FIGS. 3 and 8 , if the longitudinal direction of the battery cell 102 is a first direction X, the width direction of the battery cell 102 is a second direction Y, and the height direction of the battery cell 102 is a third direction Z, and the liquid injection port 1029 is provided on one side of the battery cell 102 in the third direction, and the size of the battery cell 102 in the first direction X is much larger than the size of the battery cell 102 in the second direction Y, then the outlet end 9 b of the liquid injection nozzle 9 may be configured to be elongated, so that the longitudinal direction of the outlet end 9 b of the liquid injection nozzle 9 coincides with the first direction X and the width direction of the outlet end 9 b of the liquid injection nozzle 9 coincides with the second direction Y, thereby making full use of the space above the battery cell 102 and increasing the area of ​​the outlet end 9 b of the liquid injection nozzle 9 as much as possible.

[0090] In some embodiments of the present application, the cross-sectional shape of the expansion segment 92 may be set to match the shape of the outlet end 9b of the injection nozzle 9, which is advantageous for a gradual change in the shape of the injection nozzle 9, a gentle transition, and improving the flow performance of the electrolyte within the injection nozzle 9. For example, when the outlet end 9b of the injection nozzle 9 is formed in an elongated shape, the cross-section of the expansion segment 92 is formed in an elongated structure, i.e., the length of the cross-section of the expansion segment 92 is greater than the width, and for example, the cross-section of the expansion segment 92 is formed in a rectangular, oval, elliptical, or the like.

[0091] The present application further proposes a liquid injection device, which includes any one of the above-mentioned liquid injection nozzles 9. The liquid injection device of the embodiments of the present application can improve liquid injection efficiency and shorten the liquid injection time. As can be understood, the specific configuration of the liquid injection device is not limited, and may include, for example, a container for storing electrolyte, a liquid supply channel connecting the container and the liquid injection nozzle 9, and a control system for controlling whether the liquid supply channel delivers liquid to the liquid injection nozzle 9.

[0092] The present application further proposes a battery cell 102. Combining Figures 8 to 10, the battery cell 102 includes a case assembly 1021, which has a receiving cavity 1A within it, and a liquid filling port 1029 on the case assembly 1021 that communicates with the receiving cavity 1A. Combining Figures 3 to 7, the battery cell 102 employs any one of the above-mentioned liquid filling nozzles 9 to fill the liquid into the receiving cavity 1A through the liquid filling port 1029.

[0093] Specifically, the outlet end 9b of the liquid injection nozzle 9 may be aligned with the liquid injection port 1029 on the battery cell 102; for example, the liquid injection nozzle 9 may be inserted into or covered by the liquid injection port 1029, and the liquid injection device may be activated. The liquid injection device may transport the electrolyte into the liquid injection port 1029 through the liquid injection nozzle 9, and the electrolyte injected from the liquid injection port 1029 may be injected into the containing cavity 1A, thereby realizing the injection of the liquid into the battery cell 102. In this way, the use of the liquid injection nozzle 9 according to the embodiment of the present application can improve the efficiency of liquid injection, which is advantageous in shortening the manufacturing process of the battery cell 102.

[0094] 7 and 8, in some embodiments of the present application, the shape of the liquid injection port 1029 matches the shape of the outlet end 9b of the liquid injection nozzle 9. This makes full use of the size of the liquid injection port 1029 and makes the size of the outlet end 9b of the liquid injection nozzle 9 as large as possible, thereby improving the liquid injection efficiency, and since the shape of the liquid injection port 1029 matches the shape of the outlet end 9b of the liquid injection nozzle 9, it is advantageous in alleviating the problem of liquid leakage.

[0095] It should be noted that, when the shape of the pouring port 1029 matches the shape of the outlet end 9b of the pouring nozzle 9, in some examples, the outlet end 9b of the pouring nozzle 9 may be fitted into the pouring port 1029, thereby reducing the fitting gap between the two, and in some examples, the outlet end 9b of the pouring nozzle 9 may be covered over the pouring port 1029, thereby reducing contamination of other positions on the battery cell 102 with the electrolyte.

[0096] 7, the outlet end 9b of the pouring nozzle 9 is suitable for being fitted into the pouring port 1029. That is, before pouring, the outlet end 9b of the pouring nozzle 9 may be inserted into the pouring port 1029. In this way, the pouring port 1029 serves to stop and surround the outlet end of the pouring nozzle 9, improving the fitting stability between the pouring nozzle 9 and the pouring port 1029 and reducing the probability of leakage during the pouring process.

[0097] Furthermore, when the shape of the pouring port 1029 matches the shape of the outlet end 9b of the pouring nozzle 9, the outlet end 9b of the pouring nozzle 9 is suitable for being fitted into the pouring port 1029, thereby reducing the fitting gap between the two, which is advantageous in further improving the pouring efficiency and reducing the problem of liquid leakage during pouring.

[0098] 9 , in some embodiments of the present application, the case assembly 1021 has an accommodating groove 211 with a notch that opens in a direction away from the accommodating cavity 1A, and the case assembly 1021 further has a liquid passing hole 23 that connects the accommodating groove 211 to the accommodating cavity 1A, and the notch in the accommodating groove 211 forms a liquid filling hole 1029. In this way, when an electrolyte is poured into the battery cell 102, the electrolyte poured from the liquid filling nozzle 9 is first poured into the accommodating groove 211 through the notch in the accommodating groove 211 (i.e., the liquid filling hole 1029), and the electrolyte that enters the accommodating groove 211 flows toward the accommodating cavity 1A through the liquid passing hole 23.

[0099] As a result, the receiving groove 211 serves to cache the electrolyte, thereby alleviating problems such as electrolyte splashing and overflow. The side walls of the receiving groove 211 (i.e., the groove walls extending from the notch of the receiving groove 211 toward the receiving cavity 1A) can prevent electrolyte splashing to some extent, reduce external contamination by the electrolyte, and facilitate rapid injection. The notch of the receiving groove 211 has a relatively large area compared to the punch shape, which is advantageous for increasing the area of ​​the injection hole 1029, thereby advantageous for enlarging the outlet end 9b of the injection nozzle 9, and thereby advantageous for further improving injection efficiency.

[0100] 7, the cross section of the notch segment of the receiving groove 211 gradually increases in the direction away from the receiving cavity 1A, i.e., the notch segment of the receiving groove 211 is flared. In the above technical solution, the flared notch segment of the receiving groove 211 can further reduce the problem of electrolyte overflowing from the receiving groove 211. Furthermore, when the outlet end 9b of the injection nozzle 9 is configured to be inserted into the injection port 1029, the flared notch segment of the receiving groove 211 can easily insert the injection nozzle 9 into the notch segment of the receiving groove 211, thereby improving the efficiency of installation before injection.

[0101] It should be noted that the installation position of the liquid filling port 1029 in the case assembly 1021 is not limited. For example, when the battery cell 102 needs to be filled, the battery cell 102 may be arranged so that the liquid filling port 1029 is located at the top of the case assembly 1021. In this case, the electrolyte injected into the liquid filling port 1029 through the liquid filling nozzle 9 can flow downward into the receiving cavity 1A, thereby improving the convenience of filling and reducing the possibility of the electrolyte overflowing or splashing. On the other hand, when the battery cell 102 is in operation, the liquid filling port 1029 may be sealed. In this case, the battery cell 102 may be arranged so that the liquid filling port 1029 is located at any position on the case assembly 1021. For example, when the battery cell 102 is in operation, the liquid filling port 1029 may be located at the top, bottom, side, etc. of the case assembly 1021.

[0102] In some embodiments of the present application, as shown in FIG. 10 , a case assembly 1021 may include a case 1 and a post structure 1020, where the case 1 defines a receiving cavity 1A, the post structure 1020 is provided on the case 1, and the liquid inlet 1029 is provided on the post structure 1020.

[0103] The battery cell 102 according to the embodiment of the present application has a filler hole 1029 on the post structure 1020, through which electrolyte can be poured into the receiving cavity 1A. This allows electrolyte to be poured through the post structure 1020. Because there is no need to separately drill the filler hole 1029 on the case 1 of the battery cell 102, the filler hole 1029 does not occupy space in the case 1. The post structure 1020 does not need to be downsized to accommodate the filler hole 1029. This increases the area and fluid passage area of ​​the post structure 1020 without increasing the size of the case 1, reducing fluid passage resistance and improving the fluid passage efficiency of the battery cell 102. This is advantageous for increasing the area of ​​the post structure 1020 and for assembling and connecting the post structure 1020 to the case 1. Furthermore, because there is no need to increase the size of the case 1 to increase the area of ​​the post structure 1020, this is advantageous for achieving a smaller and lighter case 1.

[0104] Furthermore, since there is no need to perform special processing on the case 1 to separately open the filling hole 1029 on the case 1 of the battery cell 102, this is advantageous in reducing the structural complexity and processing difficulty of the case 1. Furthermore, there is no need to locally thicken the case 1 to weld a sealing nail onto it, which further simplifies the structure and processing of the case 1. There is also no need to thicken the entire case 1 to weld a sealing nail onto it, which is advantageous in meeting the requirement for a thinner case 1, improving the energy density of the battery cell 102, and reducing the weight and material costs of the case 1. Furthermore, by locating the filling hole 1029 on the post structure 1020, the manufacturing and processing of the filling hole 1029 is simplified, and the size, shape, etc. of the filling hole 1029 can be relatively easily tailored to meet design requirements and application demands, which is advantageous in reducing the processing difficulty and processing costs of the filling hole 1029.

[0105] It should be noted that the structure of the post structure 1020 and the type of the liquid inlet 1029 installed thereon are not limited and can be specifically designed according to actual circumstances. For example, in some specific embodiments, the liquid inlet 1029 may be a punch type that penetrates the post structure 1020, thereby simplifying the structure.

[0106] For example, in some specific embodiments, when the liquid filling port 1029 is formed by a notch in the receiving groove 211, as shown in FIGS. 10 and 11 , a case assembly 1021 includes a case 1 and a post structure 1020, where the case 1 defines a receiving cavity 1A, the post structure 1020 includes a post body 2 and a post cover plate 3, the post body 2 is attached to the case 1, the receiving groove 211 and the liquid passage hole 23 are both formed on the post body 2, and the post cover plate 3 covers the notch in the receiving groove 211. Therefore, before filling, the post cover plate 3 can be left unattached to leave the notch in the receiving groove 211 open, and the liquid filling nozzle 9 can be used to fill the notch in the receiving groove 211. After filling, the post cover plate 3 can be used to seal the notch in the receiving groove 211, thereby avoiding the problem of electrolyte leakage from the notch in the receiving groove 211 and improving the reliability of the battery cell 102. Here, since the post cover plate 3 covers the notch of the receiving groove 211, the assembly and connection of the post cover plate 3 and the post body 2 becomes easy.

[0107] Furthermore, by providing the receiving groove 211 and the liquid passage hole 23 on the post structure 1020, which allow the electrolyte to be poured into the receiving cavity 1A, the electrolyte can be poured through the post structure 1020. This eliminates the need for a separate liquid filling port 1029 on the case 1 for the battery cell 102. The liquid filling port 1029 does not occupy any space in the case 1. The post structure 1020 does not need to be downsized to accommodate the liquid filling port 1029. This increases the area and fluid passage area of ​​the post structure 1020 without increasing the size of the case 1, reducing fluid passage resistance and improving the fluid passage efficiency of the battery cell 102. This is advantageous for increasing the area of ​​the post structure 1020 and for assembling and connecting the post structure 1020 to the case 1. Furthermore, because the size of the case 1 does not need to be increased to increase the area of ​​the post structure 1020, this is advantageous for achieving a smaller and lighter case 1.

[0108] It should be noted that the assembly and connection method between the post cover plate 3 and the post body 2 is not limited and may be, for example, welding (e.g., fusion welding or brazing), adhesive, etc. For example, the post cover plate 3 and the post body 2 are connected by laser welding. However, laser welding between the post cover plate 3 and the post body 2 requires a relatively high level of cleanliness for the notch segments of the receiving groove 211. If electrolyte remains in the notch segments of the receiving groove 211, the electrolyte is likely to evaporate due to heat. Gases generated by the evaporation may escape from the welding molten pool, resulting in defects such as pinholes and decomposition points in the weld. In some embodiments of the present application, the notch segments of the receiving groove 211 are flared to reduce the problem of liquid accumulation in the notch segments of the receiving groove 211, which is advantageous for improving the welding yield between the post cover plate 3 and the post body 2.

[0109] In some embodiments of the present application, as shown in Fig. 8, the post body 2 is elongated, i.e., the length of the post body 2 is greater than the width of the post body 2, and the receiving groove 211 is formed as an elongated groove extending in the longitudinal direction from one end of the post body 2 to the other end of the length. Illustratively, at least one of the cross section of the post body 2 and the cross section of the receiving groove 211 is formed as a rectangle, an oval, or an ellipse. Here, the oval shape may also be called a runway shape, i.e., formed by stitching semicircles on both ends of the length of a rectangle.

[0110] In the above technical solution, the installation of the accommodating groove 211 makes full use of the space in the post body 2, increases the size of the accommodating groove 211, and is advantageous in improving the injection efficiency. Combining Figures 7 and 8, for example, by setting the outlet end 9b of the injection nozzle 9 to match the notch shape of the accommodating groove 211, it is advantageous to further improve the injection efficiency.

[0111] In some embodiments of the present application, as shown in FIG. 10 , the battery cell 102 includes a battery core assembly 7, which includes an active material coating portion 71 housed in the housing cavity 1A and a conductive portion 72 connected to the active material coating portion 71. Exemplarily, the conductive portion 72 is connected to the post body 2 to establish an electrical connection, thereby enabling the battery core assembly 7 to output from an electrode in the post body 2. For example, the conductive portion 72 can be connected to the post body 2 by welding or the like. As can be understood, the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only a tab portion or may include a tab portion and an adapter electrically connected to the tab portion, and the embodiments are not limited thereto.

[0112] Here, as shown in Figure 10, a communication hole 22 is formed on the post body 2, connecting the accommodating groove 211 and the accommodating cavity 1A, and there may be one or more communication holes 22, and at least one of the communication holes 22 is made into a liquid passage hole 23, and the conductive portion 72 is drilled in at least one of the communication holes 22 so that it is at least partially accommodated in the accommodating groove 211. For example, an accommodating groove 211 and a communicating hole 22 are formed on the post body 2, the accommodating groove 211 opens in a direction away from the accommodating cavity 1A and communicates with the outside of the case 1, the communicating hole 22 is located on the side of the accommodating groove 211 closer to the accommodating cavity 1A, and the communicating hole 22 penetrates the groove wall on the side of the accommodating groove 211 closer to the accommodating cavity 1A to communicate the accommodating groove 211 with the accommodating cavity 1A, at least one of the communicating holes 22 is a liquid passage hole 23, and the conductive portion 72 may pass through the communicating hole 22 that is designated as the liquid passage hole 23 (i.e., the communicating hole 22 through which the conductive portion 72 passes can still be used for the electrolyte to flow after the conductive portion 72 has passed), or may pass through the communicating hole 22 that is not designated as the liquid passage hole 23 (i.e., the communicating hole 22 through which the conductive portion 72 passes is not used for the electrolyte to flow after the conductive portion 72 has passed).

[0113] As a result, by accommodating at least a portion of the conductive portion 72 in the accommodating groove 211, at least a portion of the conductive portion 72 occupies the space in the accommodating groove 211, thereby reducing the space occupied by the conductive portion 72 in the accommodating cavity 1A, and saving space in the accommodating cavity 1A to accommodate a larger volume of active material coated portion 71, which is advantageous for improving the energy density of the battery cell 102, or for reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0114] 12 , in some embodiments, the communication hole 22 through which the conductive portion 72 is drilled is the first communication hole 221 (i.e., the conductive portion 72 is drilled in at least one communication hole 22, and the communication hole 22 through which the conductive portion 72 is drilled is the first communication hole 221), and at least the first communication hole 221 may be used as the liquid passage hole 23. In this way, when the post body 2 has the first communication hole 221 through which the conductive portion 72 passes, the first communication hole 221 through which the conductive portion 72 is drilled also has a liquid passage function, i.e., has a liquid passage gap even after the conductive portion 72 is drilled in the first communication hole 221, regardless of whether the post body 2 has second communication holes 222 (described later) through which the conductive portion 72 is not drilled. During injection, after the electrolyte is poured into the receiving groove 211, at least a part of the electrolyte may flow from the first communication hole 221 through which the conductive portion 72 is formed to the receiving cavity 1A.

[0115] In some embodiments, referring to FIG. 13 , the communication hole 22 through which the conductive portion 72 is drilled is a first communication hole 221, and the communication holes 22 are multiple and further include at least one second communication hole 222 through which the conductive portion 72 is not drilled (i.e., at least one communication hole 22 does not have a conductive portion 72 drilled therein, and the communication hole 22 through which the conductive portion 72 is not drilled is the second communication hole 222), and at least the second communication hole 222 may be used as a liquid passage hole 23.

[0116] For example, if the first communication hole 221 also has a liquid passage function (i.e., the first communication hole 221 has a liquid passage gap even after the conductive portion 72 has passed through), the first communication hole 221 and the second communication hole 222 are both liquid passage holes 23, and during injection, after the electrolyte is injected into the accommodating groove 211, some of it may flow from the first communication hole 221, in which the conductive portion 72 is formed, to the accommodating cavity 1A, and some of it may flow from the second communication hole 222, in which the conductive portion 72 is not formed, to the accommodating cavity 1A.

[0117] 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 portion 72 passes through it, making it impossible for liquid to pass through), only the second communication hole 222 is used as the liquid passage hole 23, and during injection, after the electrolyte is injected into the accommodating groove 211, it flows into the accommodating cavity 1A only through the second communication hole 222, which does not have the conductive portion 72 drilled therein.

[0118] In the embodiments of the present application, when at least the first communicating hole 221 is used as a liquid passage hole 23, the first communicating hole 221 also has a liquid passage function, that is, it may be used to pass the electrolyte after a conductive portion 72 is drilled in the first communicating hole 221. At this time, at least the first communicating hole 221 may be used to pass the electrolyte, which makes it possible to choose whether to install a communicating hole 22 (for example, the second communicating hole 222) that does not have a conductive portion 72 drilled therein as needed, and further reduces the total number of communicating holes 22 drilled, which simplifies the structure and processing of the post body 2 and is advantageous for improving the structural strength of the post body 2.

[0119] In the embodiments of the present application, when at least the second communicating hole 222 is made into a liquid passage hole 23, the electrolyte may be passed through at least the second communicating hole 222. In this case, there is no need to set the diameter or number of the first communicating hole 221 relatively large to allow the electrolyte to pass through the first communicating hole 221, and there is no need to set the size of the conductive portion 72 relatively small to allow the electrolyte to pass through the first communicating hole 221. It is only necessary to design the size of the first communicating hole 221 to be slightly larger than the size of the conductive portion 72 so that the conductive portion 72 can pass through. This can solve the problem of impurities and the like falling into the accommodating cavity 1A through the gap between the conductive portion 72 and the first communicating hole 221, and can also solve the problem of the strength of the post body 2 being locally weakened due to the size of the first communicating hole 221 being too large. The size of the conductive portion 72 may be made relatively large, which is advantageous for improving fluid passage efficiency. Furthermore, when the electrolyte passes through the second communication hole 222, it is not affected by the conductive part 72, which improves the injection efficiency and makes it less likely that the electrolyte will cause problems such as contamination and corrosion of the conductive part 72.

[0120] For example, in Example 1 of the present application, there is at least one communication hole 22, and each communication hole 22 is provided with a conductive portion 72, so that each communication hole 22 is a first communication hole 221. At this time, at least one first communication hole 221 forms a liquid passage hole 23, and after the electrolyte is injected into the accommodating groove 211, it flows from the first communication hole 221 provided with the conductive portion 72 to the accommodating cavity 1A.

[0121] For example, in Example 2 of the present application, there are at least two communication holes 22, and at least one communication hole 22 is a first communication hole 221 in which a conductive portion 72 is drilled, and at least one communication hole 22 is a second communication hole 222 in which a conductive portion 72 is not drilled. In this case, the first communication hole 221 and the second communication hole 222 both constitute a liquid passage hole 23, and after the electrolyte is injected into the accommodating groove 211, a portion of the electrolyte flows from the first communication hole 221 in which a conductive portion 72 is drilled to the accommodating cavity 1A, and the remaining portion flows from the second communication hole 222 in which a conductive portion 72 is not drilled to the accommodating cavity 1A.

[0122] For example, in Example 3 of the present application, there are at least two communication holes 22, and at least one communication hole 22 is a first communication hole 221 in which a conductive portion 72 is drilled, and at least one communication hole 22 is a second communication hole 222 in which a conductive portion 72 is not drilled. After the conductive portion 72 passes through the first communication hole 221, it is blocked and liquid cannot pass through. At this time, only the second communication hole 222 constitutes the liquid passage hole 23, and after the electrolyte is injected into the accommodating groove 211, it flows from the second communication hole 222 in which a conductive portion 72 is not drilled to the accommodating cavity 1A.

[0123] 12 and 13 , in some embodiments, the post body 2 is formed as an elongated structure, and the communication hole 22 (i.e., the first communication hole 221) through which the conductive portion 72 is drilled is formed as an elongated hole whose length is greater than its width and which extends longitudinally from one longitudinal end to the other longitudinal end of the post body 2. This makes full use of the space in the post body 2, making it possible to maximize the length of the first communication hole 221, and allowing a larger-sized conductive portion 72 to pass through the first communication hole 221, which is advantageous for improving fluid passage efficiency. When the first communication hole 221 is used as a liquid passage hole 23, increasing the length of the first communication hole 221 is also advantageous for improving liquid injection efficiency.

[0124] In some embodiments, when the communication hole 22 through which the conductive portion 72 is drilled is the first communication hole 221, the first communication hole 221 and the conductive portion 72 are both multiple, and each first communication hole 221 has at least one conductive portion 72 drilled therein. In this case, at least two communication holes 22 are each drilled with a conductive portion 72, thereby improving the problem of the strength of the post body 2 being locally weakened due to the relatively large size of a single first communication hole 221. 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 the liquid injection efficiency.

[0125] For example, when the first communication hole 221 is formed as an elongated hole whose length is greater than its width and which extends in the longitudinal direction from one longitudinal end of the post body 2 to the other longitudinal end, multiple first communication holes 221 may be disposed at intervals along the width direction of the post body 2. In this way, the space on the post body 2 can be utilized relatively effectively, and the problem of localized weakening of the strength of the post body 2 due to the relatively large size of a single first communication hole 221 can be alleviated. Furthermore, when the first communication holes 221 are used as liquid passage holes 23, increasing the number of first communication holes 221 is also advantageous in improving liquid injection efficiency.

[0126] 13 , in some embodiments, when the post body 2 has both a first communicating hole 221 and a second communicating hole 222, if the first communicating hole 221 is an elongated hole whose length is greater than its width and which extends longitudinally from one end of the post body 2 to the other end, the second communicating hole 222 may be located at at least one of the longitudinal ends of the first communicating hole 221, thereby making full use of space and increasing the size of the second communicating hole 222 as much as possible to improve injection efficiency while improving the structural strength of the post body 2. Furthermore, if second communicating holes 222 are located at both longitudinal ends of the first communicating hole 221, injection efficiency can be further improved and the size of each second communicating hole 222 can be reduced, thereby alleviating the problem of localized weakness of the post body 2.

[0127] Of course, in the embodiments of the present application, the shape of the first communicating hole 221 and the relative positional relationship between the first communicating hole 221 and the second communicating hole 222 are not limited to the above description, and can be adjusted according to actual conditions.

[0128] Of course, the present application is not limited thereto, and the inlet 1029 does not have to be installed on the post structure 1022; for example, the inlet 1029 may be installed directly on the case 1, or on a pressure relief structure to which the case 1 is attached, thereby realizing flexible design of the position of the inlet 1029.

[0129] In some embodiments of the present application, as shown in Fig. 10 , the case 1 includes a first case wall 11, and the liquid filling hole 1029 is provided directly or indirectly in the first case wall 11. Here, as shown in Fig. 10 , the first case wall 11 and at least one second case wall 12 are integrally molded, and the second case wall 12 extends toward one side in the thickness direction of the first case wall 11. Alternatively, the first case wall 11 may be configured as an integrally molded cover plate. This allows for flexible design of the position of the liquid filling hole 1029, thereby increasing the range of application of the battery cell 102 in the embodiments of the present application.

[0130] It should be noted that the second case wall 12 may extend from an edge of the first case wall 11, and if the first case wall 11 is rectangular, at least one of the four edges of the first case wall 11 may extend from the second case wall 12. For example, only one edge of the first case wall 11 may extend from the second case wall 12, only two edges of the first case wall 11 may extend from the second case wall 12, three edges of the first case wall 11 may extend from the second case wall 12, or all four edges of the first case wall 11 may extend from the second case wall 12. For example, if the case 1 is a rectangular case, any one wall of the rectangular case may be the first case wall 11.

[0131] For example, the case 1 may include a case body and a cover plate, the case body defining a space that is open on one side, and the cover plate being disposed on the open side of the case body so as to form an accommodating cavity 1A between the case body and the cover plate, in which case the wall surface of the case body facing the cover plate is the first case wall 11, and the wall surface connected between the first case wall 11 of the case body and the cover plate is the second case wall 12, or the wall surface of the case body facing the cover plate is the second case wall 12, and the wall surface connected between the second case wall 12 of the case body and the cover plate is the first case wall 11, or the cover plate is the first case wall 11, any of these is possible.

[0132] 2 and 14 , the present application further provides a battery 100, including a busbar member 103 and battery cells 102 according to any one of the above solutions, where the battery cells 102 are multiple, and at least two of the battery cells 102 are electrically connected via the busbar member 103. This allows the multiple battery cells 102 to be connected in series and / or in parallel. This can improve the manufacturing efficiency of the battery 100 according to the embodiments of the present application. It should be noted that the battery 100 according to the embodiments of the present application may or may not include a housing 101.

[0133] For example, when multiple battery cells 102 are connected in series, the positive post cover plate 3 of one battery cell 102 and the negative post cover plate 3 of the next battery cell 102 are connected via one bus bar member 103, and the negative post cover plate 3 of this battery cell 102 and the positive post cover plate 3 of the previous battery cell 102 are connected via another bus bar member 103.

[0134] Embodiments of the present application further provide a power consuming device, which includes any one of the battery 100s described above. According to some embodiments of the present application, the present application further provides a power consuming device, which includes any one of the battery 100s described above, which is used to provide electrical energy to the power consuming device. The power consuming device may be a device or system that uses any one of the batteries 100 described above.

[0135] The following describes one specific embodiment according to the present application.

[0136] The battery cell 102 includes a case 1, a post body 2, a post cover plate 3, and a battery core assembly 7, the case 1 defining an accommodating cavity 1A, the post body 2 being disposed on the case 1, the post body 2 being formed with an accommodating groove 211 and a communicating hole 22, the notch of the accommodating groove 211 opening in a direction away from the accommodating cavity 1A, the communicating hole 22 communicating the first accommodating groove 211 and the accommodating cavity 1A, the communicating hole 22 being one or more, and at least one of the communicating holes 22 being a liquid passage hole 23, the post cover plate 3 being a holeless cover plate and covering the post body 2 to seal the notch of the accommodating groove 211.

[0137] The battery core assembly 7 includes an active material coated portion 71 and a conductive portion 72, the active material coated portion 71 is accommodated in the accommodating cavity 1A, the conductive portion 72 connects the active material coated portion 71 and the post body 2, the conductive portion 72 is drilled in at least one communicating hole 22 so as to be at least partially accommodated in the first accommodating groove 211, and the portion of the conductive portion 72 located in the first accommodating groove 211 is welded to the post body 2.

[0138] When manufacturing the battery cell 102, the conductive part 72 is first drilled into the communicating hole 22 on the post body 2, and the conductive part 72 is welded to the post body 2. Then, the injection nozzle 9 is used to inject the electrolyte into the receiving groove 211. The electrolyte injected into the receiving groove 211 enters the case 1 through the liquid passage hole 23. After the injection is complete, the post cover plate 3 is sealed and welded to the post body 2, thereby achieving a tight seal.

[0139] The liquid injection nozzle 9 includes a second constant cross-section segment 95, an expanding segment 92, a first constant cross-section segment 94, and a gradually contracting segment 93, which are arranged in this order from the inlet end 9a of the liquid injection nozzle 9 to the outlet end 9b of the liquid injection nozzle 9. The expanding segment 92 has a gradually expanding shape in which the fluid passage area gradually increases from the inlet end 9a to the outlet end 9b. The fluid passage area of ​​the gradually contracting segment 93 gradually decreases from the inlet end 9a to the outlet end 9b. The fluid passage area at the smallest cross-sectional end of the gradually contracting segment 93 is larger than the fluid passage area at the smallest cross-sectional end of the expanding segment 92. The axial length L3 of the gradually contracting segment 93 is smaller than the axial length L2 of the expanding segment 92. The outer wall of the gradually contracting segment 93 is a smoothly curved surface.

[0140] The fluid passage area of ​​the first constant cross-section segment 94 is equal to the fluid passage area of ​​the largest cross-sectional end of the gradually decreasing segment 93 and the fluid passage area of ​​the largest cross-sectional end of the expanding segment 92, respectively, and the axial length L4 of the first constant cross-section segment 94 is greater than the axial length L3 of the gradually decreasing segment 93. The fluid passage area of ​​the second constant cross-section segment 95 is equal to the fluid passage area of ​​the smallest cross-sectional end of the expanding segment 92. The smallest cross-sectional end of the gradually decreasing segment 93 forms the outlet end 9b of the liquid injection nozzle 9, and the end of the second constant cross-section segment 95 away from the expanding segment 92 forms the inlet end 9a of the liquid injection nozzle 9. The fluid passage area of ​​the inlet end 9a of the liquid injection nozzle 9 is smaller than the fluid passage area of ​​the outlet end 9b of the liquid injection nozzle 9. The outlet end 9b of the liquid injection nozzle 9 is formed in an elongated shape, and the cross-sectional shape of the expanding segment 92 matches the shape of the outlet end 9b of the liquid injection nozzle 9.

[0141] For example, when the upper end of the injection nozzle 9 is arranged as the inlet end 9a and the lower end as the outlet end 9b, the cross section of the second constant cross-section segment 95 is circular and the diameter is consistent from top to bottom, the cross section of the expanding segment 92 is oval and the cross-sectional area gradually increases from top to bottom, the cross section of the first constant cross-section segment 94 is oval and the cross-sectional area is consistent from top to bottom, and the cross section of the gradually decreasing segment 93 is oval and the cross-sectional area gradually decreases from top to bottom. The injection nozzle 9 can be made of a corrosion-resistant or metallic material.

[0142] In the battery cells of the related art, the outlet end of the injection nozzle is relatively small during the injection process, resulting in relatively low injection efficiency and the need for high positive pressure to assist the injection, which causes the interior of the battery cell to contract after injection, resulting in electrolyte spraying. In contrast, in the embodiment of the present application, the cross sections of the notch of the receiving groove 211, the enlarging segment 92, the first constant cross-section segment 94, and the gradually tapering segment 93 are all oval. Therefore, during injection, the gradually tapering segment 93 is inserted into the notch segment of the receiving groove 211, and the area of ​​the outlet end 9b of the injection nozzle 9 is relatively large, which is advantageous for improving electrolyte injection efficiency and does not require the application of positive pressure during injection. The electrolyte can effectively reduce the internal pressure of the battery cell 102 during the injection process, thereby reducing the risk of liquid spraying.

[0143] The gradually reducing segment 93 is inserted into the notch segment of the accommodating groove 211. Since the gradually reducing segment 93 is closed and has a smoothly curved outer wall, friction problems that occur when the gradually reducing segment 93 is inserted into the notch segment of the accommodating groove 211 are reduced, and reliability problems caused by conductive particles entering the battery cell 102 due to friction are reduced, thereby improving the reliability of the battery cell 102.

[0144] In short, the upper side of the injection nozzle 9 is connected to the electrolyte supply passage of the injection device, and the lower side is directly connected to the injection port 1029 on the battery cell 102. The outlet end 9b of the injection nozzle 9 is oval in shape, which effectively increases the injection area and improves injection efficiency. The closed outlet end 9b of the injection nozzle 9 allows it to fit relatively closely to the injection port 1029, which is advantageous in reducing the problem of electrolyte overflow during the injection process. Inserting the injection nozzle 9 into the injection port 1029 effectively prevents conductive particles from falling due to friction between the injection nozzle 9 and the injection port 1029, thereby improving the reliability of the battery cell 102.

[0145] It should be mentioned that, unless there is a conflict, the embodiments and features in the embodiments in the present application can be combined with each other.

[0146] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. [Explanation of symbols]

[0147] Vehicle 1000, first direction X, second direction Y, third direction Z, battery 100, controller 200, motor 300, housing 101, first box body 1011, second box body 1012, battery cell 102, case assembly 1021, post structure 1020, case 1, accommodating cavity 1A, first case wall 11, second case wall 12, post body 2, accommodating groove 211, communicating hole 22, first communicating hole 221, second communicating hole 222, liquid passage hole 23, pressure relief structure 1022, post cover plate 3, battery core assembly 7, active material coated portion 71, conductive portion 72, busbar member 103, liquid injection port 1029, liquid injection nozzle 9, inlet end 9a, outlet end 9b, liquid injection flow path 91, expanding segment 92, gradually decreasing segment 93, first constant cross-section segment 94, second constant cross-section segment 95.

Claims

1. 1. A liquid injection nozzle comprising an expanding segment, wherein a fluid passage area of ​​the liquid injection nozzle increases in the expanding segment along a direction from an inlet end of the liquid injection nozzle toward an outlet end of the liquid injection nozzle.

2. 2. The liquid injection nozzle according to claim 1, wherein a fluid passage area at an inlet end of the liquid injection nozzle is smaller than a fluid passage area at an outlet end of the liquid injection nozzle.

3. 3. The liquid injection nozzle according to claim 1, wherein the expanding segment is formed in a gradually expanding shape such that a fluid passage area gradually increases in a direction from the inlet end toward the outlet end.

4. 4. The liquid injection nozzle according to claim 1, wherein the liquid injection nozzle includes a gradually converging segment, the gradually converging segment being located on a side of the diverging segment away from the inlet end, a fluid passage area of ​​the gradually converging segment gradually decreasing along a direction from the inlet end toward the outlet end, and an end of the gradually converging segment with a smallest cross section forming the outlet end.

5. 5. The liquid injection nozzle according to claim 4, wherein a fluid passage area at a minimum cross-sectional end of the gradually contracting segment is larger than a fluid passage area at a minimum cross-sectional end of the expanding segment, and an axial length of the gradually contracting segment is smaller than an axial length of the expanding segment.

6. 6. The liquid injection nozzle according to claim 4 or 5, wherein the liquid injection nozzle includes a first constant cross-section segment, the first constant cross-section segment is connected between the expanding segment and the gradually contracting segment, and a fluid passage area of ​​the first constant cross-section segment is equal to a fluid passage area of ​​a maximum cross-sectional end of the gradually contracting segment and a fluid passage area of ​​a maximum cross-sectional end of the expanding segment, respectively, and an axial length of the first constant cross-section segment is greater than the axial length of the gradually contracting segment.

7. 7. The liquid injection nozzle according to claim 4, wherein an outer wall of the gradually reducing segment has a smoothly curved surface.

8. 8. The liquid injection nozzle according to claim 1, wherein the liquid injection nozzle includes a second constant cross-section segment connected to a side of the expansion segment remote from the outlet end, the second constant cross-section segment having a fluid passage area equal to the fluid passage area of ​​the smallest cross-section end of the expansion segment, and the end of the second constant cross-section segment remote from the expansion segment constitutes the inlet end.

9. The liquid injection nozzle according to claim 1 , wherein the outlet end of the liquid injection nozzle is formed in an elongated shape.

10. 10. The liquid injection nozzle according to claim 1, wherein the cross-sectional shape of the enlarged segment matches the shape of the outlet end of the liquid injection nozzle.

11. A liquid injection device comprising the liquid injection nozzle according to any one of claims 1 to 10.

12. 12. A battery cell including a case assembly, the case assembly having a storage cavity therein, and the case assembly having a liquid filling port communicating with the storage cavity, the battery cell employing the liquid filling nozzle according to claim 1 to 11 for liquid filling, the liquid filling nozzle filling the storage cavity through the liquid filling port.

13. The battery cell of claim 12 , wherein the shape of the liquid injection port matches the shape of the outlet end of the liquid injection nozzle.

14. 14. The battery cell according to claim 12 or 13, wherein an outlet end of the liquid filling nozzle is adapted to be fitted into the liquid filling port.

15. 15. The battery cell according to claim 12, wherein the case assembly has a housing groove with a notch that opens in a direction away from the housing cavity, the case assembly further has a liquid passage hole that communicates with the housing groove and the housing cavity, and the notch in the housing groove forms the liquid inlet.

16. The battery cell of claim 15 , wherein a cross section of the notch segment of the receiving groove gradually increases along a direction away from the receiving cavity.

17. 17. The battery cell of claim 12, wherein the case assembly includes a case and a post structure, the case defining a receiving cavity, the post structure being provided on the case, and the liquid inlet being provided on the post structure.

18. 17. The battery cell of claim 15 or 16, wherein the case assembly includes a case and a post structure, the case defining an accommodating cavity, the post structure including a post body and a post cover plate, the post body attached to the case, the accommodating groove and the liquid passage hole both formed on the post body, and the post cover plate covering a notch in the accommodating groove.

19. The battery cell according to claim 18 , wherein the post body is elongated, and the accommodating groove is formed as an elongated groove extending in a direction from one end of the post body to the other end of the post body in the longitudinal direction.

20. 20. The battery cell of claim 18 or 19, wherein the battery core assembly includes a battery core assembly, the battery core assembly including an active material coating portion accommodated in the accommodating cavity and a conductive portion connected to the active material coating portion, the post body having a communication hole that connects the accommodating groove and the accommodating cavity, the number of communication holes being one or more, and at least one of the communication holes being the liquid passage hole, and the conductive portion being drilled in at least one of the communication holes so as to be at least partially accommodated in the accommodating groove.

21. A battery comprising a bus bar member and the battery cell according to any one of claims 12 to 20, wherein there are a plurality of the battery cells, and at least two of the battery cells are electrically connected via the bus bar member.

22. 22. A power consuming device comprising the battery of claim 21.

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