Liquid injection nozzle, liquid injection device and battery production line

Abstract

The utility model relates to the technical field of battery production, in particular to a liquid injection nozzle, a liquid injection device and a battery production line. The liquid injection nozzle is used for injecting electrolyte into the accommodating cavity of the single battery through the liquid injection hole, the liquid injection nozzle comprises a liquid injection nozzle body, the liquid injection nozzle body comprises a positioning part and a matching part, a first channel is arranged in the positioning part, and a second channel communicated with the first channel is arranged in the matching part; the positioning part is of a first conical structure and comprises a large-head end and a small-head end which are arranged in the axial direction of the positioning part, the large-head end is connected with the matching part, and the small-head end is configured to be inserted into the containing cavity through the liquid injection hole before the electrolyte injection process; the matching part is configured to be matched with the liquid injection hole in an inserted mode, the positioning part comprises at least two first fins arranged at intervals, and a first channel is defined by the at least two first fins. According to the liquid injection nozzle, the positioning part of the first conical structure is used for achieving the positioning effect, so that the matching part of the liquid injection nozzle can be matched with the liquid injection hole in an inserted connection mode, and the probability of electrolyte leakage can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and particularly relates to a liquid injection nozzle, a liquid injection device and a battery production line. BACKGROUND

[0002] The part provided in this section is merely background information related to the present disclosure, and it does not necessarily have to be prior art.

[0003] With the increasing maturity of new energy technology, electric devices such as new energy vehicles have gradually entered the public view. The main core technology of new energy vehicles lies in battery devices, and the safety and stability of the battery devices directly determine the performance of the whole vehicle.

[0004] In the production process of the battery device, a liquid injection device needs to be used to inject electrolyte into the battery device. The liquid injection device includes a liquid injection nozzle, and the liquid injection nozzle is used to inject the electrolyte into the liquid injection hole of the electrode assembly. In the process, the liquid injection nozzle is prone to deviating from the center of the liquid injection hole, and the electrolyte is prone to leaking. Utility model content

[0005] In view of the above problems, the present application provides a liquid injection nozzle, a liquid injection device and a battery production line, which solve the problem that the liquid injection nozzle in the prior art is prone to electrolyte leakage in the process of injecting electrolyte into the liquid injection hole of the electrode assembly.

[0006] The first aspect of the embodiments of the present application provides a liquid injection nozzle for injecting electrolyte into a containing cavity of a battery monomer through a liquid injection hole of the battery monomer, and the liquid injection nozzle comprises:

[0007] A liquid injection nozzle body, the liquid injection nozzle body comprises a positioning portion and a matching portion, the positioning portion is provided with a first channel, and the matching portion is provided with a second channel in communication with the first channel;

[0008] The positioning portion is in a first conical structure, and the positioning portion comprises a large end and a small end arranged along the axial direction of the positioning portion, wherein, before the electrolyte injection process, the large end is connected with the matching portion, the small end is configured to be inserted into the containing cavity through the liquid injection hole, and the matching portion is configured to be inserted and matched with the liquid injection hole;

[0009] The positioning portion comprises at least two first fins arranged at intervals, and the at least two first fins surround the first channel.

[0010] The injection nozzle body of the embodiment of this application is provided with a positioning part and a mating part. The positioning part has a first channel, and the mating part has a second channel communicating with the first channel. The positioning part has a first conical structure and includes a large end and a small end arranged along its own axis. The large end is connected to the mating part, and the small end is configured to be inserted into the receiving cavity through the injection hole. The mating part is configured to be inserted and mated with the injection hole. In the process of inserting the injection nozzle into the injection hole, the positioning part of the first conical structure achieves the positioning function, so that the mating part of the injection nozzle can be inserted and mated with the injection hole, and the mating part will not deviate from the center of the injection hole, thereby reducing the probability of electrolyte leakage.

[0011] In some embodiments of this application, the number of first fins is three or more, and all the first fins are evenly distributed along the circumference of the positioning portion.

[0012] The embodiments of this application, by having three or more first fins and all first fins evenly distributed along the circumference of the positioning portion, can ensure that the interval between two adjacent first fins remains consistent, provide a certain space for the deformation of each first fin, and facilitate the formation of the positioning portion by three or more first fins.

[0013] In some embodiments of this application, the injection nozzle body further includes a flow guide connected to the mating part, and the flow guide is provided with a third channel, which is connected to the second channel.

[0014] The embodiments of this application provide a flow guide connected to the mating part, wherein the flow guide has a third channel that is connected to the second channel. The third channel can provide electrolyte to the second channel through the third channel, which facilitates the injection of electrolyte into the housing cavity of the battery cell.

[0015] In some embodiments of this application, at least a portion of the surface of the guide portion facing the battery cell is configured to contact the battery cell.

[0016] The embodiments of this application, by configuring at least a portion of the surface of the guide portion facing the battery cell to contact the battery cell, can further seal the contact surface between the guide portion and the battery cell, thereby reducing the probability of electrolyte leakage.

[0017] In some embodiments of this application, the third channel, the second channel, and the first channel are coaxially arranged.

[0018] The embodiments of this application, by coaxially arranging the third channel, the second channel, and the first channel, allow the electrolyte to flow more smoothly through the third channel, the second channel, and the first channel in sequence, reducing the resistance encountered during electrolyte flow. In addition, coaxially arranging the third channel, the second channel, and the first channel facilitates the connection between the flow guiding part and the assembly part, and also facilitates the connection between the assembly part and the positioning part.

[0019] In some embodiments of this application, the mating part includes a second fin, and a second fin is connected to each first fin.

[0020] The embodiments of this application include a second fin in the mating part, with a second fin connected to each first fin, so that the mating part is constructed with spaced second fins, which facilitates the insertion and mating between the mating part and the injection hole.

[0021] In some embodiments of this application, prior to the electrolyte injection process, at least a portion of the second fin is configured to abut against the wall of the injection hole and be separable from the injection hole.

[0022] The embodiments of this application, by configuring at least a portion of the second fin to abut against the wall of the injection hole and to be separable from the injection hole, can improve the stability of the connection between the second fin and the injection hole after the second fin is inserted and engaged with the injection hole, reduce the probability of electrolyte leakage, and enable separation from the injection hole after the electrolyte injection is completed.

[0023] In some embodiments of this application, all the second fins form a second conical structure, with the large end of the second conical structure connected to the large end, wherein the minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole.

[0024] In the embodiments of this application, by forming all the second fins into a second conical structure, and connecting the large end of the second conical structure to the large end, wherein the minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole, all the second fins can be interference-fitted with the injection hole, thereby reducing the probability of electrolyte leakage from the contact surface between the second fins and the injection hole.

[0025] In some embodiments of this application, the spacing between two adjacent second fins is less than the width of the second fin.

[0026] In the embodiments of this application, by making the interval between two adjacent second fins smaller than the width of the second fin, the mating part formed by the second fin can make full contact with the injection hole, thereby enhancing the overall strength of the mating part and allowing the second fin to have room for deformation.

[0027] In some embodiments of this application, the interval between two adjacent second fins is L1, and the width of the second fin is L2, wherein the ratio of L1 to L2 is W, and 1 / 5≤W≤1 / 3.

[0028] In the embodiments of this application, the interval between two adjacent second fins is L1, the width of the second fin is L2, and the ratio of L1 to L2 is W, where 1 / 5≤W≤1 / 3. This allows the mating part formed by the second fin to make full contact with the injection hole, enhances the overall strength of the mating part, and allows the second fin to have room for deformation.

[0029] In some embodiments of this application, the second fin and the first fin connected to the second fin are an integral structure.

[0030] The embodiments of this application, by setting the second fin and the first fin connected to the second fin as an integral structure, can facilitate the processing of the injection nozzle body and reduce the probability of electrolyte leakage from the connection point between the second fin and the first fin connected to the second fin.

[0031] In some embodiments of this application, the injection nozzle body is an elastic element.

[0032] The embodiments of this application, by setting the injection nozzle body as an elastic element, can utilize the elasticity of the elastic element to deform the injection nozzle body, making it easier to install the injection nozzle body onto the injection hole and improving the installation efficiency of the injection nozzle body.

[0033] A second aspect of the embodiments of this application provides a liquid injection device, comprising:

[0034] Liquid supply components; and

[0035] As mentioned in the above embodiment, the injection nozzle is connected to the liquid supply assembly.

[0036] A third aspect of the embodiments of this application provides a battery production line, which includes the liquid injection device mentioned in the above embodiments.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This application provides a schematic diagram of the structure of an electrical device according to some embodiments;

[0040] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0041] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 4 A three-dimensional structural schematic diagram of an injection nozzle provided for some embodiments of this application;

[0043] Figure 5 for Figure 4 The diagram shown is a structural schematic of the injection nozzle from a second-view perspective;

[0044] Figure 6 for Figure 4 The diagram shown is a structural schematic of the injection nozzle from a third-person perspective;

[0045] Figure 7 This is a schematic diagram of the structure of the injection nozzle in the injection state provided in some embodiments of this application;

[0046] Figure 8 for Figure 7 The diagram shows the structure of the injection nozzle during the insertion of the electrode assembly;

[0047] Figure 9 This is a schematic diagram of the structure of the liquid injection device provided in some embodiments of this application.

[0048] The attached figures are labeled as follows:

[0049] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0050] 10. Battery cell; 11. Electrode assembly; 111. Top cover; 1111. Liquid filling hole; 1112. Pressure relief component; 12. Housing; 121. Receiving cavity; 13. Insulating component;

[0051] 20. Battery housing; 21. First housing; 22. Second housing; 23. Storage space;

[0052] 400. Liquid injection device;

[0053] 30. Injection nozzle; 31. Injection nozzle body; 311. Positioning part; 3111. First channel; 3112. Large end; 3113. Small end; 3114. First fin; 312. Fitting part; 3121. Second channel; 3122. Second fin; 313. Flow guide; 3131. Third channel; 32. Cavity part; 321. Fourth channel;

[0054] 40. Liquid supply assembly; 41. Liquid injection channel;

[0055] XX, the length direction of the injection nozzle;

[0056] ZZ, the height direction of the injection nozzle;

[0057] D1, the minimum diameter of the second conical structure;

[0058] D2, Diameter of the injection hole;

[0059] L1, the interval between two adjacent second fins;

[0060] L2, the width of the second fin. Detailed Implementation

[0061] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0069] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0070] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0071] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0073] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0074] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0075] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0076] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0077] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0078] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0079] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing; it can be sealed or not sealed.

[0080] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0081] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0082] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0083] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0084] During the production of battery devices, an electrolyte injection device is required to inject electrolyte into the battery device. The electrolyte injection device includes an injection nozzle, which injects the electrolyte into the battery device. However, during the process of injecting the electrolyte into the injection hole of the electrode assembly, the injection nozzle may deviate from the center of the injection hole, resulting in electrolyte leakage.

[0085] To address this problem, embodiments of this application propose an injection nozzle for injecting electrolyte into the receiving cavity of a battery cell through the injection hole. The injection nozzle includes an injection nozzle body, which includes a positioning part and a mating part. The positioning part has a first channel, and the mating part has a second channel communicating with the first channel. The positioning part has a first conical structure and includes a large end and a small end arranged along its own axial direction. The large end is connected to the mating part. Before the electrolyte injection process, the small end is configured to be inserted into the receiving cavity through the injection hole, and the mating part is configured to be inserted and mated with the injection hole. The embodiments of this application, by setting a positioning part and a mating part, wherein the positioning part has a first channel, and the mating part has a second channel communicating with the first channel, the positioning part has a first conical structure, and the positioning part includes a large end and a small end arranged along its own axial direction, wherein the large end is connected to the mating part, and before the electrolyte injection process, the small end is configured to be inserted into the receiving cavity through the injection hole, and the mating part is configured to be inserted and mated with the injection hole, so that during the process of inserting the injection nozzle into the injection hole, the positioning part of the first conical structure is used to achieve the positioning function, so that the mating part of the injection nozzle can be inserted and mated with the injection hole, and the mating part will not deviate from the center of the injection hole, thereby reducing the probability of electrolyte leakage.

[0086] The injection nozzle in the embodiments of this application can be used on an injection device to inject electrolyte, or it can be installed on other injection devices to inject other liquids into the product.

[0087] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0088] Combination Figure 1 As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, the battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] like Figure 2 As shown, an embodiment of this application also provides a battery device 100, including a battery housing 20 and a battery cell 10. The battery housing 20 has a receiving space 23, and the battery cell 10 is installed in the receiving space 23.

[0091] In some embodiments, such as Figure 2 As shown, the battery housing 20 may include a first housing 21 and a second housing 22, which overlap each other, together defining a receiving space 23 for accommodating the battery cell 10. Both the first housing 21 and the second housing 22 can be hollow structures with one open end, with the second housing 22 covering the open side of the first housing 21, so that the first housing 21 and the second housing 22 together define the receiving space; alternatively, the second housing 22 can be a plate-like structure, and the first housing 21 can be a hollow structure with one open side, with the open side of the second housing 22 covering the open side of the first housing 21. Of course, the battery housing 20 formed by the first housing 21 and the second housing 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0092] like Figure 3 As shown, embodiments of this application also propose a battery cell 10, which includes a housing 12, an electrode assembly 11, and an insulating member 13. The housing 12 includes a receiving cavity 121. The electrode assembly 11 is disposed within the receiving cavity 121, and the insulating member 13 is disposed in at least a portion of the space between the electrode assembly 11 and the housing 12.

[0093] It should be noted that the insulating component 13 is made of insulating material, which can achieve insulation between the electrode assembly 11 and the housing 12. The housing 12 can be a hollow cuboid, cube, or cylinder, and one of its surfaces has an opening to allow one or more electrode assemblies 11 to be placed inside the housing 12. For example, when the housing 12 is a hollow cuboid or cube, one of its planes is an opening, that is, this plane does not have a wall of the housing 12, allowing communication between the inside and outside of the housing 12.

[0094] Optionally, the battery cell 10 also includes a top cover 111, which is used to close the opening of the housing 12 to enclose the electrode assembly 11 within the receiving cavity 121. The top cover 111 is provided with an injection hole 1111 and a pressure relief device 1112. Alternatively, the injection hole 1111 and the pressure relief device 1112 can also be provided on the housing 12.

[0095] Embodiments of this application also provide an injection nozzle 30, such as... Figures 4 to 8 As shown, the injection nozzle 30 is used to inject electrolyte into the receiving cavity 121 of the battery cell 10 through the injection hole 1111 of the battery cell 10. The injection nozzle 30 includes an injection nozzle body 31, which includes a positioning part 311 and a mating part 312. The positioning part 311 has a first channel 3111, and the mating part 312 has a second channel 3121 that communicates with the first channel 3111. The positioning part 311 has a first conical structure and includes a large end 3112 and a small end 3113 arranged along its own axial direction. Before the electrolyte injection process, the large end 3112 is connected to the mating part 312, the small end 3113 is configured to be inserted into the receiving cavity 121 through the injection hole 1111, and the mating part 312 is configured to be inserted and mated with the injection hole 1111.

[0096] It should be noted that the first conical structure here can be a conical structure with closed sides or a conical structure with spaced sides. The conical structure can be a circular conical structure or a pyramidal structure. Regardless of which conical structure is adopted, the first channel 3111 in the positioning part 311 can achieve the function of electrolyte flow.

[0097] The larger end 3112 mentioned here refers to the larger end of the first conical structure, and the smaller end 3113 refers to the smaller end of the first conical structure. The larger end 3112 and the smaller end 3113 are located at opposite ends of the positioning part 311 along its own axial direction, with the larger end 3112 connected to the mating part 312. During the process of inserting the injection nozzle 30 into the injection hole 1111, the smaller end 3113 is inserted into the injection hole 1111 first, and the positioning part 311 is pushed by the injection hole 1111, thus playing a positioning role.

[0098] The nozzle body 31 of the nozzle 30 in the embodiments of this application is provided with a positioning part 311 and a mating part 312. The positioning part 311 has a first channel 3111, and the mating part 312 has a second channel 3121 communicating with the first channel 3111. The positioning part 311 has a first conical structure and includes a large end 3112 and a small end 3113 arranged along its own axial direction. The large end 3112 is connected to the mating part 312, and the small end 3112... The nozzle 30 is configured to be inserted into the receiving cavity 121 through the injection hole 1111, and the mating part 312 is configured to engage with the injection hole 1111. During the process of inserting the injection nozzle 30 into the injection hole 1111, the positioning part 311 of the first conical structure is used to achieve the positioning function, so that the mating part 312 of the injection nozzle 30 can engage with the injection hole 1111. The mating part 312 will not deviate from the center of the injection hole 1111, thus reducing the probability of electrolyte leakage.

[0099] Optionally, such as Figures 4 to 6 As shown, the positioning part 311 includes at least two first fins 3114 spaced apart, and the at least two first fins 3114 form a first channel 3111.

[0100] It is understandable that the number of first fins 3114 can be two or more. When there are two first fins 3114, each first fin 3114 has a structure approximately resembling a half-frustum plate. There is a gap between the two first fins 3114, forming an open first conical structure. The interior of the first conical structure has a first channel 3111 arranged along its own axial direction, and the electrolyte flows along the direction defined by the first channel 3111. The axial direction of the first conical structure is the same as the ZZ direction.

[0101] In the embodiments of this application, the positioning part 311 includes at least two first fins 3114 spaced apart, and the at least two first fins 3114 form a first channel 3111. The positioning part 311 can be deformed by the gap between two adjacent first fins 3114, which facilitates the insertion of the positioning part 311 into the receiving cavity 121 through the injection hole 1111. This allows the injection nozzle 30 to be quickly installed onto the injection hole 1111, thereby improving the installation efficiency of the injection nozzle 30.

[0102] Optionally, the number of first fins 3114 is three or more, and all the first fins 3114 are evenly distributed along the circumference of the positioning part 311.

[0103] exist Figure 4In this part, there are four first fins 3114, and the interval between two adjacent first fins 3114 is the same. At this time, the four first fins 3114 are evenly distributed along the circumference of the positioning part 311, so that the positioning part 311 can form an axisymmetric structure, making the process of the positioning part 311 being inserted into the injection hole 1111 smoother.

[0104] In the embodiments of this application, by having three or more first fins 3114, and by having all the first fins 3114 evenly distributed along the circumference of the positioning part 311, the spacing between two adjacent first fins 3114 can be kept consistent, providing a certain space for the deformation of each first fin 3114, and facilitating the formation of the positioning part 311 by three or more first fins 3114.

[0105] Optionally, such as Figure 7 As shown, the injection nozzle body 31 also includes a flow guide 313 connected to the mating part 312. The flow guide 313 has a third channel 3131, which is connected to the second channel 3121.

[0106] It should be noted that after the injection nozzle body 31 is inserted into the injection hole 1111 and installed in place, the guide part 313 can contact the top cover 111, and a sealed structure can be formed between the guide part 313 and the top cover 111. The electrolyte can flow from the third channel 3131 into the second channel 3121, and then enter the receiving cavity 121 of the battery cell 10 after passing through the first channel 3111, which is the receiving cavity 121 of the casing.

[0107] The embodiments of this application provide a flow guide 313 connected to the mating part 312. The flow guide 313 has a third channel 3131 that communicates with the second channel 3121. The third channel 3131 can provide electrolyte to the second channel 3121 through the third channel 3131, which facilitates the injection of electrolyte into the receiving cavity 121 of the battery cell 10.

[0108] Optionally, such as Figure 7 As shown, at least a portion of the surface of the flow guide 313 facing the battery cell 10 is configured to contact the battery cell 10.

[0109] Specifically, at least a portion of the surface of the flow guide 313 facing the battery cell 10 is provided in contact with the top cover 111 of the battery cell 10, thereby forming a sealed structure between the flow guide 313 and the top cover. In addition to the sealing structure between the mating part 312 and the injection hole 1111, it can further seal the electrolyte.

[0110] In the embodiments of this application, by configuring at least a portion of the surface of the guide portion 313 facing the battery cell 10 to contact the battery cell 10, the contact surface between the guide portion 313 and the battery cell 10 can play a further sealing role, reducing the probability of electrolyte leakage.

[0111] It is understandable that the contact area between the guide portion 313 and the top cover 111 on both sides of the injection hole 1111 along the XX direction is the same, which can make the sealing effect of the top cover 111 in the circumferential direction of the injection hole 1111 basically the same, reducing the probability of the guide portion 313 tilting or deviating from the injection hole 1111.

[0112] Optionally, such as Figure 7 and Figure 8 As shown, the third channel 3131, the second channel 3121 and the first channel 3111 are coaxially arranged.

[0113] The third channel 3131 can be a circular flow channel, the second channel 3121 can be a conical flow channel, and the first channel 3111 is a conical flow channel. The center lines of the third channel 3131, the second channel 3121, and the first channel 3111 are on the same straight line.

[0114] Alternatively, the third channel 3131 here can also adopt a multi-segment flow channel structure, wherein the diameters of the multiple flow channels are different, but the center line of the third channel 3131 is located on the same straight line. Therefore, even if the third channel 3131 adopts a multi-segment flow channel structure, it can still be coaxially arranged with the second channel 3121 and the first channel 3111.

[0115] The embodiments of this application, by coaxially arranging the third channel 3131, the second channel 3121, and the first channel 3111, allow the electrolyte to flow more smoothly through the third channel 3131, the second channel 3121, and the first channel 3111 in sequence, reducing the resistance encountered by the electrolyte during flow. In addition, coaxially arranging the third channel 3131, the second channel 3121, and the first channel 3111 facilitates the connection between the flow guiding part 313 and the assembly part, and also facilitates the connection between the assembly part and the positioning part 311.

[0116] Optionally, the mating part 312 includes a second fin 3122, and a second fin 3122 is connected to each first fin 3114. In this case, the number of second fins 3122 is the same as the number of first fins 3114.

[0117] The second fin 3122 and the first fin 3114 connected to the second fin 3122 can be an integral structure, formed by an integrated process. Alternatively, the second fin 3122 and the first fin 3114 connected to the second fin 3122 can also be separate structures, connected by welding or bonding.

[0118] In the embodiments of this application, by including a second fin 3122 in the mating part 312, and connecting a second fin 3122 to each first fin 3114, the mating part 312 can be constructed by using spaced second fins 3122, which facilitates the insertion and mating between the mating part 312 and the injection hole 1111.

[0119] Optionally, prior to the electrolyte injection process, at least a portion of the second fin 3122 is configured to abut against the wall of the injection hole 1111 and be separable from the injection hole 1111. In this case, at least a portion of the second fin 3122 is interference-fitted with the injection hole 1111.

[0120] Specifically, the entire second fin 3122 can be interference-fitted with the injection hole 1111, or a portion of the second fin 3122 can be interference-fitted with the injection hole 1111. Interference-fitting means that the outer diameter of the mating part 312 is greater than or equal to the diameter of the injection hole 1111.

[0121] In the embodiments of this application, by configuring at least a portion of the second fin 3122 to abut against the wall of the injection hole 1111 and to be separable from the injection hole 1111, the stability of the insertion between the second fin 3122 and the injection hole 1111 is improved after the second fin 3122 is inserted into the injection hole 1111, the probability of electrolyte leakage is reduced, and the second fin 3122 can be separated from the injection hole 1111 after the electrolyte injection is completed.

[0122] Optionally, such as Figure 4 As shown, all the second fins 3122 form a second conical structure, and the large end of the second conical structure is connected to the large end 3112. The minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole 1111.

[0123] exist Figure 4 In this configuration, there are four of each of the first fin 3114 and the second fin 3122. The large end of the second conical structure is connected to the large end 3112 of the second conical structure. The minimum outer diameter of the second conical structure is also the minimum outer diameter of the mating part 312. Figure 8 As shown, the minimum outer diameter of the mating part 312 is D1, and the diameter of the injection hole 1111 is D2, wherein D1 is greater than or equal to D2.

[0124] In addition, D1 here is slightly larger than D2, which allows the mating part 312 to be inserted into the injection hole 1111 without the mating part 312 being unable to be inserted into the injection hole 1111.

[0125] In the embodiments of this application, all the second fins 3122 are arranged into a second conical structure, and the large end of the second conical structure is connected to the large end 3112. The minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole 1111. This allows all the second fins 3122 to be interference-fitted with the injection hole 1111, reducing the probability of electrolyte leakage from the contact surface between the second fins 3122 and the injection hole 1111.

[0126] In addition, the second fin 3122 here forms a second conical structure, which makes it easy for the second fin 3122 to be pulled upward from the injection hole 1111, so that the injection nozzle 30 can be separated from the injection hole 1111 after the injection is completed.

[0127] Optionally, such as Figure 4 As shown, the spacing between two adjacent second fins 3122 is less than the width of the second fin 3122.

[0128] It should be noted that, considering the structure formed by the second fin 3122 is a second conical structure, the direction of the second conical structure along its own axial direction, that is... Figure 7 The outer diameters in the ZZ direction are different. Therefore, the width of the second fin 3122 is selected as the maximum circumferential dimension of the second fin 3122. Similarly, the spacing between two adjacent second fins 3122 is also selected as the maximum spacing between two adjacent second fins 3122.

[0129] In the embodiments of this application, by making the interval between two adjacent second fins 3122 smaller than the width of the second fin 3122, the mating part 312 formed by the second fin 3122 can make sufficient contact with the liquid injection hole 1111, thereby enhancing the overall strength of the mating part 312 and allowing the second fin 3122 to have room for deformation.

[0130] Optionally, the interval between two adjacent second fins 3122 is L1, and the width of the second fin 3122 is L2, wherein the ratio of L1 to L2 is W, and 1 / 5≤W≤1 / 3.

[0131] Continue to refer to Figure 4 As shown, the interval between two adjacent second fins 3122 is L1, and the width of the second fin 3122 is L2. L1 is less than L2, and the ratio W of L1 and L2 can be 1 / 5, 1 / 4, 1 / 3, or 0.25, etc.

[0132] In the embodiments of this application, the interval between two adjacent second fins 3122 is L1, and the width of the second fin 3122 is L2, wherein the ratio of L1 to L2 is W, and 1 / 5≤W≤1 / 3. This allows the mating part 312 formed by the second fins 3122 to make sufficient contact with the injection hole 1111, thereby enhancing the overall strength of the mating part 312 and allowing the second fins 3122 to have room for deformation.

[0133] It should be further explained that if the ratio W between the interval L1 between two adjacent second fins 3122 and the width L2 of the second fin 3122 is too small, the size of the interval L1 will be too small, resulting in a poorer deformation capacity of the mating part 312. Conversely, if the ratio W between the interval L1 between two adjacent second fins 3122 and the width L2 of the second fin 3122 is too large, the strength of the entire mating part 312 will be reduced, resulting in a smaller contact area between the mating part 312 and the injection hole 1111, a poorer sealing performance, and a higher risk of electrolyte leakage.

[0134] Optionally, such as Figure 7 and Figure 8 As shown, the second fin 3122 and the first fin 3114 connected to the second fin 3122 are an integral structure.

[0135] The second fin 3122 and the first fin 3114 connected to the second fin 3122 are an integral structure, which allows the second fin 3122 and the first fin 3114 connected to the second fin 3122 to be a single unit. Figure 4 As shown, there are four first fins 3114 and four second fins 3122. Therefore, each first fin 3114 and the second fin 3122 connected to it are a single structure.

[0136] The embodiments of this application, by setting the second fin 3122 and the first fin 3114 connected to the second fin 3122 as an integral structure, can facilitate the processing of the injection nozzle body 31 and reduce the probability of electrolyte leakage from the connection position of the second fin 3122 and the first fin 3114 connected to the second fin 3122.

[0137] Optionally, the injection nozzle body 31 is an elastic element.

[0138] Specifically, the nozzle body 31 can adopt an elastic structure. Specifically, the mating part 312 and the positioning part 311 can both adopt an elastic structure. Specifically, they can be made of elastic materials. For example, the mating part 312 and the positioning part 311 can be made of silicone or rubber, which are elastic and make it easy to assemble the nozzle body 31 onto the injection hole 1111.

[0139] In the embodiments of this application, by setting the injection nozzle body 31 as an elastic element, the elasticity of the elastic element can be used to deform the injection nozzle body 31, which facilitates the installation of the injection nozzle body 31 onto the injection hole 1111 and improves the installation efficiency of the injection nozzle body 31.

[0140] Optionally, the injection nozzle 30 further includes a cavity portion 32, wherein a fourth channel 321 is provided inside the cavity portion 32, and the fourth channel 321 communicates with the third channel 3131. The cavity portion 32 is connected to the flow guide portion 313, and the cavity portion 32 and the mating portion 312 are respectively located on both sides of the flow guide portion 313 along the ZZ direction.

[0141] Embodiments of this application also provide a liquid injection device 400, such as... Figure 9 As shown, it includes a liquid supply assembly 40 and an injection nozzle 30 as mentioned in the above embodiment, the injection nozzle 30 being connected and communicating with the liquid supply assembly 40.

[0142] The electrolyte supply assembly 40 can be connected to the injection nozzle 30 via the injection channel 41. The electrolyte in the electrolyte supply assembly 40 is injected into the fourth channel 321 of the cavity 32 of the injection nozzle 30 through the injection channel 41, and then sequentially injected into the receiving cavity 121 of the housing 12 through the third channel 3131, the second channel 3121 and the first channel 3111, thus filling the interior of the battery cell 10 with electrolyte.

[0143] The injection nozzle 30 in the embodiments of this application, such as Figure 7 and Figure 8 As shown, during insertion into the injection hole 1111, because the positioning part 311 has a second conical structure, during insertion into the injection hole 1111, the injection nozzle 30 is subjected to downward pressure. After contacting the top cover 111, the side wall of the injection hole 1111 of the top cover 111 can generate a pushing force acting on the positioning part 311, allowing the top cover 111 to move along the XX direction. Thus, the positioning part 311 can play a positioning role during insertion into the receiving cavity 121. When the mating part 312 is inserted into the injection hole 1111, the center line of the mating part 312 can coincide with the center line of the injection hole 1111, so that the injection nozzle 30 can be accurately installed on the injection hole 1111 without the injection nozzle 30 deviating from the center line of the injection hole 1111. This allows the mating part 312 and the injection hole 1111 to form a sealing structure. Furthermore, the contact surface between the guide part 313 and the top cover 111 can provide a further sealing effect, resulting in a double sealing effect.

[0144] Embodiments of this application also propose a battery production line, which includes the liquid injection device 400 mentioned in the above embodiments.

[0145] Understandably, battery production lines also include winding and welding equipment to realize various processes in the battery manufacturing process.

[0146] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0147] A first aspect of the embodiments of this application provides an injection nozzle 30 for injecting electrolyte into the receiving cavity 121 of a battery cell 10 through an injection hole 1111. The injection nozzle 30 includes an injection nozzle body 31, which includes a positioning part 311 and a mating part 312. The positioning part 311 has a first channel 3111, and the mating part 312 has a second channel 3121 communicating with the first channel 3111. The positioning part 311 has a first conical structure and includes a large end 3112 and a small end 3113 arranged along its own axial direction. The large end 3112 is connected to the mating part 312, and the small end 3113 is configured to be inserted into the receiving cavity 121 through the injection hole 1111. The mating part 312 is configured to be inserted into the injection hole 1111. Further, the positioning part 311 includes at least two spaced-apart first fins 3114, which together form a first channel 3111. Further, the number of first fins 3114 is three or more, and all first fins 3114 are evenly distributed along the circumference of the positioning part 311. Further, the injection nozzle body 31 also includes a flow guide 313 connected to the mating part 312, and the flow guide 313 has a third channel 3131 that communicates with the second channel 3121. Further, at least a portion of the surface of the flow guide 313 facing the battery cell 10 is capable of contacting the battery cell 10. Further, the third channel 3131, the second channel 3121, and the first channel 3111 are coaxially arranged. Further, the mating part 312 includes at least two spaced-apart second fins 3122, which are respectively connected to corresponding first fins 3114. Further, at least a portion of the second fins 3122 are interference-fitted with the injection hole 1111. Further, all the second fins 3122 form a second conical structure, with the large end of the second conical structure connected to the large end 3112, wherein the minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole 1111. Further, the spacing between two adjacent second fins 3122 is less than the width of the second fin 3122. Further, the spacing between two adjacent second fins 3122 is L1, and the width of the second fin 3122 is L2, wherein the ratio of L1 to L2 is W, and 1 / 5 ≤ W ≤ 1 / 3. Further, the second fins 3122 and the first fin 3114 connected to the second fins 3122 are an integral structure. Further, the injection nozzle body 31 is an elastic element.

[0148] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An injection nozzle for injecting electrolyte into the receiving cavity of a battery cell through an injection hole, characterized in that, The injection nozzle includes: The injection nozzle body includes a positioning part and a mating part. The positioning part has a first channel, and the mating part has a second channel communicating with the first channel. The positioning part has a first conical structure, and the positioning part includes a large end and a small end arranged along its own axis. Before the electrolyte injection process, the large end is connected to the mating part, the small end is configured to be inserted into the receiving cavity through the injection hole, and the mating part is configured to be inserted into the injection hole. The positioning part includes at least two first fins spaced apart, the at least two first fins forming the first channel.

2. The injection nozzle as described in claim 1, characterized in that, The number of the first fins is three or more, and all the first fins are evenly distributed along the circumference of the positioning part.

3. The injection nozzle as described in claim 1, characterized in that, The injection nozzle body also includes a flow guide connected to the mating part, and the flow guide has a third channel that communicates with the second channel.

4. The injection nozzle as described in claim 3, characterized in that, At least a portion of the surface of the guide portion facing the battery cell is configured to contact the battery cell.

5. The injection nozzle as described in claim 3, characterized in that, The third channel, the second channel, and the first channel are arranged coaxially.

6. The injection nozzle as described in claim 1, characterized in that, The mating part includes a second fin, and each of the first fins is connected to a second fin.

7. The injection nozzle as described in claim 6, characterized in that, Prior to the electrolyte injection process, at least a portion of the second fin is configured to abut against the wall of the injection hole and be separable from the injection hole.

8. The injection nozzle as described in claim 7, characterized in that, All the second fins form a second conical structure, the large end of the second conical structure is connected to the large head end, wherein the minimum outer diameter of the second conical structure is greater than or equal to the diameter of the injection hole.

9. The injection nozzle as described in claim 7, characterized in that, The spacing between two adjacent second fins is less than the width of the second fin.

10. The injection nozzle as described in claim 9, characterized in that, The interval between two adjacent second fins is L1, and the minimum width of the second fin is L2, wherein the ratio of L1 to L2 is W, and 1 / 5≤W≤1 / 3.

11. The injection nozzle as described in any one of claims 6 to 10, characterized in that, The second fin and the first fin connected to the second fin are an integral structure.

12. The injection nozzle according to any one of claims 1 to 10, characterized in that, The injection nozzle body is an elastic element.

13. A liquid injection device, characterized in that, include: Liquid supply components; as well as The injection nozzle as described in any one of claims 1 to 12, wherein the injection nozzle is in communication with the liquid supply assembly.

14. A battery production line, characterized in that, Includes the electrolyte injection device as described in claim 13, the electrolyte injection device being used to inject electrolyte into a battery cell.

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