Battery module, battery monomer, top cover assembly and processing method thereof

Abstract

The invention relates to a battery module, a battery monomer, a top cover assembly and a processing method thereof. The battery module comprises a top cover plate, the pole column is arranged on the top cover plate; the upper plastic cement is arranged outside the pole in a sleeving manner, and the upper plastic cement is connected with the top cover plate; and a first compact coating and a second compact coating, the first compact coating hermetically covers the joint of the pole and the upper plastic, and the second compact coating hermetically covers the joint of the upper plastic and the top cover plate. The nano material has the advantages of surface effect, volume effect and the like, so that the first compact coating and the second compact coating can obtain a compact coating structure which is uniform in texture, stable in performance and high in adhesiveness, and reliable sealing of a gap at the two connecting positions can be achieved. Therefore, compared with the prior art, a traditional sealing ring can be omitted, the leakage problem caused by inclined installation, aging and the like of the sealing ring is solved, and it is guaranteed that the top cover assembly is safe and reliable to use.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a battery module, a battery cell, a top cover assembly and a processing method thereof. Background Art

[0002] In the manufacturing of power batteries, the battery packaging is achieved by assembling and connecting the top cover assembly with the shell. The top cover assembly is generally composed of top cover plate, pole, upper plastic, sealing ring and other components. The insulation between the pole and the top cover plate is achieved by isolation of the upper plastic, and the internal and external sealing of the battery is achieved by the sealing ring.

[0003] In the current production process of top cover assemblies, it is necessary to install a sealing ring separately at the pole, which will affect the assembly efficiency of the top cover assembly to a certain extent. In addition, the sealing ring is prone to be installed crookedly at the pole, which in turn causes leakage and poses a major safety hazard. In addition, the sealing ring is usually made of rubber, which is prone to aging after a period of use, resulting in the sealing not meeting the requirements. Summary of the invention

[0004] Based on this, it is necessary to provide a battery module, a battery cell, a top cover assembly and a processing method thereof to address the problems of low assembly efficiency, unsatisfactory sealing and potential safety hazards of leakage.

[0005] In one aspect, the present application provides a top cover assembly, comprising:

[0006] A top cover plate, the top cover plate comprising a first surface and a second surface opposite to each other, and a pole hole penetrating through the first surface and the second surface;

[0007] A pole, the pole comprising a chassis portion and a column portion connected to each other, the chassis portion being located on the side where the second surface of the top cover plate is located, the column portion being passed through the pole hole, and the column portion comprising a column end face disposed away from the chassis portion; and

[0008] The upper plastic comprises a main body, a first extension and a second extension connected in sequence, the main body is located on the side where the first surface of the top cover plate is located and is arranged in contact with the circumferential side wall of the column, the first extension is located between the column and the hole wall of the pole hole and is in contact with the column and the hole wall of the pole hole, the second extension is located between the bottom plate and the second surface of the top cover plate and is in contact with the bottom plate and the second surface of the top cover plate; the main body comprises a first connection surface arranged away from the first surface, and a second connection surface arranged away from the column;

[0009] Wherein, the end surface of the column and the first connecting surface are coated with a first dense coating, and the first surface and the second connecting surface are coated with a second dense coating.

[0010] When manufacturing the top cover assembly of the above scheme, the column body of the pole is inserted into the pole hole of the top cover plate, and then the top cover plate and the pole are pre-assembled and fixed by using a mold, and then the plastic is molded between the top cover plate and the pole by injection molding to complete the assembly and connection of the top cover assembly. Since there is no need to install a sealing ring during the injection molding process, the assembly steps and processes are saved, and the assembly efficiency of the top cover assembly is improved. In addition, after assembly and molding, the first extension portion of the upper plastic is located between the column body and the hole wall of the pole hole and fits the column body and the hole wall of the pole hole, and the first extension portion of the upper plastic is located between the column body and the hole wall of the pole hole. The second extension part is located between the second surface of the chassis part and the top cover plate and fits the second surface of the chassis part and the top cover plate, which can make the upper plastic, the top cover plate and the pole tightly combined, and then the first dense coating is coated on the end face of the column and the first connecting surface to form a first dense coating, and the first surface and the second connecting surface are coated to form a second dense coating. The first dense coating and the second dense coating can obtain a dense coating structure with uniform texture, stable performance and strong adhesion, and can achieve reliable sealing of the joints between the end face of the column and the first connecting surface and the joints between the first surface and the second connecting surface. In this way, compared with the prior art, the traditional sealing ring can be omitted, and the leakage problem caused by the crooked installation and aging of the sealing ring can be eliminated, ensuring the safe and reliable use of the top cover assembly.

[0011] The technical solution of this application is further described below:

[0012] In one embodiment, the main body and / or the first extension portion include a first contact surface facing the columnar portion, the first contact surface and one of the circumferential side walls of the columnar portion are provided with a first groove, the first contact surface and the other of the circumferential side walls of the columnar portion are provided with a first boss, and the first boss is inserted into the first groove.

[0013] In one embodiment, the main body includes a second contact surface arranged away from the first connecting surface, the second contact surface and one of the first surfaces are provided with a second groove, the second contact surface and the other of the first surfaces are provided with a second protrusion, and the second protrusion is inserted into the second groove.

[0014] In one embodiment, the top cover assembly also includes a lower plastic, which is located on the side of the second surface of the top cover plate. The lower plastic includes a third extension portion, which is located between the bottom plate and the second surface of the top cover plate and adheres to the bottom plate and the second surface of the top cover plate, and the end surface of the third extension portion contacts the end surface of the second extension portion.

[0015] In one embodiment, the upper plastic is formed between the top cover plate and the pole by injection molding;

[0016] The first dense coating and the second dense coating are both formed on the exterior surface of the top cover assembly.

[0017] In one embodiment, the column end surface and the first connecting surface are both formed with a first nanopore structure, and the first nanopore structure is filled and combined with the first dense coating; and / or,

[0018] A second nanopore structure is formed on both the first surface and the second connection surface, and the second nanopore structure is filled and combined with the second dense coating.

[0019] In one embodiment, the thickness of the first dense coating ranges from 0.04 mm to 0.3 mm;

[0020] The first dense coating has a ring-shaped structure, and the width of the first dense coating ranges from 3 mm to 9 mm.

[0021] In one embodiment, the thickness of the second dense coating ranges from 0.04 mm to 0.3 mm;

[0022] The second dense coating includes a first coating portion combined with the main body of the upper plastic and a second coating portion combined with the first surface of the top cover plate. The height range of the first coating portion is 1 mm to 2.5 mm, and the width range of the second coating portion is 1.5 mm to 6.5 mm.

[0023] A battery cell, comprising:

[0024] A housing having a mounting cavity and an inlet and outlet connected to each other;

[0025] A battery cell, the battery cell being installed in the installation cavity; and

[0026] As described above, the top cover assembly is sealed and covered on the inlet and outlet, and the pole is electrically connected to the battery cell.

[0027] A battery module comprises the battery cell as described above.

[0028] A method for manufacturing the top cover assembly as described above comprises the following steps:

[0029] After the top cover plate and the pole are assembled, the upper plastic is formed between the pole and the top cover plate through the injection molding process;

[0030] The top cover plate, pole and plastic assembly are pre-treated by alkaline washing, pickling, T treatment and cleaning and drying processes in sequence;

[0031] The first dense coating spraying process is completed on the connection between the pre-treated pole and the upper plastic, and the second dense coating spraying process is completed on the connection between the upper plastic and the top cover plate.

[0032] In one embodiment, the specific steps of spraying a first dense coating on the connection between the pre-treated pole and the upper plastic, and spraying a second dense coating on the connection between the upper plastic and the top cover plate are as follows:

[0033] Load the top cover plate, pole and plastic coated assembly to the spraying line;

[0034] The spraying line transports the top cover plate, pole and plastic assembly to the surface treatment station, and completes the pre-treatment and cleaning processes of the top cover plate, pole and plastic assembly in sequence;

[0035] The spraying line continues to transport the assembly of the top cover plate, pole and upper plastic to the spraying station, and the spraying equipment automatically completes the first dense coating spraying at the connection between the pole and the upper plastic, and completes the second dense coating spraying at the connection between the upper plastic and the top cover plate;

[0036] The first dense coating layer and the second dense coating layer are subjected to a drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a schematic structural diagram of a top cover assembly according to an embodiment of the present application.

[0040] Figure 2 for Figure 1 Top view of the structure.

[0041] Figure 3 for Figure 2 Cross-sectional structure diagram at AA in the middle.

[0042] Figure 4 for Figure 3 A local enlarged structural diagram of point B in the middle.

[0043] Figure 5 This is a flowchart of the steps of the processing method of the top cover assembly in this application.

[0044] Description of reference numerals:

[0045] 100, top cover assembly; 10, top cover plate; 11, first surface; 111, second convex column; 12, second surface; 13, pole hole; 20, pole; 21, chassis; 22, column; 221, column end surface; 222, first groove; 30, upper plastic; 31, main body; 311, first connection surface; 312, second connection surface; 32, first extension; 33, second extension; 34, first contact surface; 341, first convex column; 35, second contact surface; 351, second groove; 40, first dense coating; 50, second dense coating; 60, lower plastic; 61, third extension; DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0052] Nowadays, most electrical equipment such as new energy vehicles use power batteries as power sources, and in order to meet long battery life and higher power performance, power batteries often exist in the form of battery modules.

[0053] The battery module mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery module mentioned in the present application may include a battery cell or a battery pack. The battery module generally includes a box for encapsulating one or more battery cells, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0054] 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., which is not specifically limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., which is not specifically limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical batteries, square batteries and soft-pack batteries.

[0055] For example, the battery cell described in this application adopts a square battery, which specifically includes a shell, a battery cell and a top cover assembly 100. The shell has a mounting cavity and an inlet and outlet that are connected; the battery cell is installed in the mounting cavity; the top cover assembly 100 is sealed and covers the inlet and outlet, and the pole 20 is electrically connected to the battery cell. When working, the current generated by the battery cell can be output through the pole 20.

[0056] Among them, the battery cell (also called electrode assembly, bare battery cell) is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.

[0057] Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The positive electrode current collector not coated with the negative electrode active material layer protrudes from the positive electrode current collector coated with the negative electrode active material layer. The positive electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0058] The material of the diaphragm may be PP (polypropylene) or PE (polyethylene), etc. In addition, the battery core may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0059] See also Figures 1 to 3 , is a top cover assembly 100 shown in one embodiment of the present application, which includes a top cover plate 10, a pole 20, an upper plastic 30, a first dense coating 40 and a second dense coating 50.

[0060] The top cover plate 10 includes a first surface 11 and a second surface 12 facing each other, and a pole hole 13 penetrating the first surface 11 and the second surface 12; the pole 20 includes a connected bottom plate portion 21 and a column portion 22, the bottom plate portion 21 is located on the side where the second surface 12 of the top cover plate 10 is located, the column portion 22 is penetrated through the pole hole 13, and the column portion 22 includes a column end face 221 arranged away from the bottom plate portion 21; the upper plastic 30 includes a main body portion 31, a first extension portion 32 and a second extension portion 33 connected in sequence, the main body portion 31 is located The top cover plate 10 is arranged on the side where the first surface 11 is located and fits the circumferential side wall of the column portion 22, the first extension portion 32 is located between the column portion 22 and the hole wall of the pole hole 13 and fits the hole wall of the column portion 22 and the pole hole 13, the second extension portion 33 is located between the chassis portion 21 and the second surface 12 of the top cover plate 10 and fits the chassis portion 21 and the second surface 12 of the top cover plate 10; the main body portion 31 includes a first connecting surface 311 arranged away from the first surface 11, and a second connecting surface 312 arranged away from the column portion 22.

[0061] The first dense coating 40 is coated on the column end surface 221 and the first connecting surface 311 , and the second dense coating 50 is coated on the first surface 11 and the second connecting surface 312 .

[0062] In this embodiment, the first dense coating 40 and the second dense coating 50 are formed by curing after spraying of nano insulating materials. The nano insulating materials used can be acrylic-based two-component anti-corrosion coatings. They are suitable for heat-insulating and non-heat-insulating surfaces that work continuously in the temperature range of -196°C to 200°C.

[0063] It is necessary to explain that the sealing technology principle of nano insulating materials (coatings) is: when the material reaches the nanoscale, which is about 0.1 nanometers to 100 nanometers, the performance of the material will mutate and special properties will appear. Since nano materials have surface effects, volume effects, quantum size effects, macroscopic quantum tunneling effects and other characteristics, various functional coatings can be prepared after they are used in coatings. Adding nano insulating materials to the coating can form a dense coating with a high volume resistivity on the surface of the coated object, thereby improving the comprehensive insulation performance of the product. After the mature nano materials are coated, they are dispersed more evenly and stably, and the interface treatment between nano and micro particles is efficient and stable, ensuring that the bonding strength of the nano composite coating and the substrate is better and the performance is more excellent and stable. The nano composite material presents a good micro-nano structure, the nano particles wrap the micro particles intact, and the gaps between the micro particles are filled with nano particles to form a dense coating. The nano particles penetrate, fill and repair the surface of the substrate to form a large number of stable insulating intermediate phases. These characteristics constitute the necessary basic conditions for sealing the connection between the pole 20 and the upper plastic 30, and the upper plastic 30 and the top cover plate 10 (that is, the connection seam).

[0064] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: the column portion 22 of the pole 20 is inserted into the pole hole 13 of the top cover plate 10, and then the top cover plate 10 and the pole 20 are pre-assembled and fixed by a mold, and then the upper plastic 30 is formed between the top cover plate 10 and the pole 20 by an injection molding process, and the assembly and connection operation of the top cover assembly 100 can be completed. Since the sealing ring does not need to be installed during the injection molding process, the assembly steps and processes are saved, and the assembly efficiency of the top cover assembly 100 is improved; in addition, after the assembly molding, the first extension portion 32 of the upper plastic 30 is located between the column portion 22 and the hole wall of the pole hole 13 and fits the column portion 22 and the hole wall of the pole hole 13, and the second The extension part 33 is located between the bottom plate 21 and the second surface 12 of the top cover plate 10 and fits the bottom plate 21 and the second surface 12 of the top cover plate 10, so that the upper plastic 30, the top cover plate 10 and the pole 20 can be tightly combined, and then the first dense coating 40 is coated on the end face 221 of the column and the first connecting surface 311, and the second dense coating 50 is coated on the first surface 11 and the second connecting surface 12. The first dense coating 40 and the second dense coating 50 can obtain a dense coating structure with uniform texture, stable performance and strong adhesion, and can achieve reliable sealing of the joints between the end face 221 of the column and the first connecting surface 11 and the joints between the first surface 11 and the second connecting surface 312. In this way, compared with the prior art, the traditional sealing ring can be omitted, and the leakage problem caused by the crooked installation and aging of the sealing ring can be eliminated, so as to ensure the safe and reliable use of the top cover assembly 100.

[0065] On the basis of the above embodiment, the upper plastic 30 is formed between the pole 20 and the top cover plate 10 by injection molding; and the first dense coating 40 and the second dense coating 50 are both formed on the appearance surface of the top cover assembly 100. The upper plastic 30 is formed integrally with the pole 20 and the top cover plate 10 by injection molding, and the manufacturing process is simple, the structural integrity is good, and in the subsequent spraying process, the appearance surface of the top cover assembly 100 can be directly used as a processing object, that is, the nano insulating material can be directly sprayed on the surface position of the connection between the pole 20 and the upper plastic 30 and the upper plastic 30 and the top cover plate 10, so that the coating method of the first dense coating 40 and the second dense coating 50 is simpler, direct and efficient, and the thickness, width and other parameter dimensions of the first dense coating 40 and the second dense coating 50 can also be easily controlled to ensure the coating quality.

[0066] In addition, the upper plastic 30 is connected to the pole 20 and the top cover plate 10 in one piece by injection molding. Due to the poor bonding between plastic and metal, the sealing of the connection is poor. The first dense coating 40 and the second dense coating 50 sprayed and covered on the connection can form a dense coating structure with strong adhesion, which can form a reliable seal for the connection.

[0067] Please continue reading Figure 3 and Figure 4 The top cover assembly 100 further includes a lower plastic 60, which is located on the side where the second surface 12 of the top cover plate 10 is located. The lower plastic 60 includes a third extension portion 61, which is located between the bottom plate 21 and the second surface 12 of the top cover plate 10 and fits the bottom plate 21 and the second surface 21 of the top cover plate 10, and the end surface of the third extension portion 61 contacts the end surface of the second extension portion 33. During actual assembly, the lower plastic 60 is an independent structural member pre-injected and directly assembled to the top cover plate 10. At this time, the second extension portion 33 can be clamped and fixed by the bottom plate 21 and the second surface 21 of the top cover plate 10, thereby improving the installation stability of the lower plastic 60; further, the third extension portion 61 contacts and presses against the end surface of the second extension portion 33, which can eliminate the assembly gap, improve the combination precision of the upper plastic 30 and the lower plastic 60, and thus improve the sealing performance.

[0068] Please continue reading Figure 4 In addition, based on any of the above embodiments, the main body 31 and / or the first extension portion 32 includes a first contact surface 34 facing the column portion 22, one of the first contact surface 34 and the circumferential side wall of the column portion 22 is provided with a first groove 222, and the other of the first contact surface 34 and the circumferential side wall of the column portion 22 is provided with a first convex column 341, and the first convex column 341 is inserted into the first groove 222. By inserting the first convex column 341 into the first groove 222, the combination area of ​​the upper plastic 30 and the pole 20 can be increased, and the assembly strength of the upper plastic 30 and the pole 20 can be improved by means of the formed clamping force.

[0069] Furthermore, the main body 31 includes a second contact surface 35 disposed away from the first connection surface 311, and a second groove 351 is provided on one of the second contact surface 35 and the first surface 11, and a second protrusion 111 is provided on the other of the second contact surface 35 and the first surface 11, and the second protrusion 111 is inserted into the second groove 351. Similarly, by inserting the second protrusion 111 into the second groove 351, the bonding area between the upper plastic 30 and the top cover plate 10 can be increased, and the assembly strength between the upper plastic 30 and the top cover plate 10 can be improved by means of the formed clamping force.

[0070] Please continue reading Figure 4 In addition, in some embodiments, both the column end surface 21 and the first connecting surface 31 are formed with a first nano-pore structure, and the first nano-pore structure is filled and combined with the first dense coating 40 .

[0071] Furthermore, a second nanopore structure is formed on both the first surface 11 and the second connection surface 312 , and the second nanopore structure is filled and combined with the second dense coating 50 .

[0072] Taking the connection between the first dense coating 40 and the first nanopore structure as an example, when the nano-insulating material is sprayed onto the column end face 21 and the first connecting surface 31, part of the nano-insulating material can flow into the first nanopore structure, thereby increasing the bonding area between the first dense coating 40 and the pole 20 and the upper plastic 30, thereby enhancing the connection strength and reliability between the first dense coating 40 and the pole 20 and the upper plastic 30. The impact resistance and anti-falling performance of the first dense coating 40 are greatly improved, and the adhesion is stable and reliable.

[0073] The technical effects that can be obtained by the second dense coating 50 and the second nanopore structure are basically the same as those described above, so they will not be described in detail here.

[0074] In addition, based on any of the above embodiments, the thickness H1 of the first dense coating 40 is in the range of 0.04 mm to 0.3 mm; the first dense coating 40 is an annular structure, and the width D1 of the first dense coating 40 is in the range of 3 mm to 9 mm. In this embodiment, the pole 20 is a cylinder, the upper plastic 30 is an annular structure and is sleeved on the outer periphery of the pole 20, and an annular connection seam is formed between the upper plastic 30 and the pole 20, and the annular connection seam is located at the connection between the pole 20 and the upper plastic 30. The first dense coating 40 needs to completely cover the annular connection seam. And under the above-mentioned size range design, the first dense coating 40 can form a sufficient bonding area with the pole 20 and the upper plastic 30 to prevent leakage problems due to loose connection and ensure the strength of the first dense coating 40.

[0075] Please continue reading Figure 4 Furthermore, the thickness H2 of the second dense coating 50 ranges from 0.04 mm to 0.3 mm; the second dense coating 50 includes a first coating portion combined with the main body 31 of the upper plastic 30, and a second coating portion combined with the first surface 11 of the top cover plate 10, the height D2 of the first coating portion ranges from 1 mm to 2.5 mm, and the width D3 of the second coating portion ranges from 1.5 mm to 6.5 mm.

[0076] In this embodiment, the upper plastic 30 is a square cylinder, which is located on the surface of the top cover plate 10 after injection molding, so that the connection between the upper plastic 30 and the top cover plate 10 forms an annular connection seam. The second dense coating 50 needs to cover part or all of the circumferential surface of the upper plastic 30, and at the same time cover the part of the top cover plate 10 adjacent to the annular connection seam, so that the second dense coating 50 is formed into an annular structure, and the single-sided cross-section is L-shaped. At this time, the vertical part of the second dense coating 50 is the first coating part, and the horizontal part is the second coating part. Under the above-mentioned size range design, the second dense coating 50 can have sufficient bonding area with the upper plastic 30 and the top cover plate 10 to prevent leakage problems due to loose connection, while ensuring the strength of the second dense coating 50.

[0077] Please continue reading Figure 5 In addition to the above, the present application also provides a processing method for manufacturing the top cover assembly 100 as described in any of the above embodiments, which comprises the following steps:

[0078] S100 : After the top cover plate 10 and the pole 20 are assembled, the upper plastic 30 is formed between the pole 20 and the top cover plate 10 by an injection molding process.

[0079] The above-mentioned injection molding process can be completed by using existing injection molding equipment. Various parameters of the injection molding process can be flexibly set according to the material characteristics of the upper plastic 30, so they are not described in detail here.

[0080] S200: The assembly of the top cover plate 10, the pole 20 and the upper plastic 30 is subjected to alkaline washing, acid washing, T treatment and cleaning and drying processes in sequence to complete pretreatment.

[0081] Specifically, alkaline washing is to soak the assembly (i.e., the assembly of the top cover plate 10, the pole 20, and the upper plastic 30, the same below) in an alkaline liquid (such as sodium hydroxide solution, etc.) to remove the grease attached to the surface of the assembly; pickling is to soak the assembly in an acidic liquid (such as hydrochloric acid, etc.) to remove the metal oxide layer on the surface of the assembly and form an activation effect at the same time, so that larger nanopores can be corroded on the surface of the assembly. In addition, the acidic liquid can also neutralize the alkaline liquid remaining after the previous alkaline washing treatment, so that the assembly is in a neutral state. T treatment refers to soaking the assembly in a T treatment agent (weakly acidic) to form larger nanopores on the surface of the assembly into smaller nanopores. Cleaning and drying is to soak the assembly in clean water to remove excess T treatment agent, while ensuring that the nanopores are filled with T treatment agent, emptying the air, and then drying the assembly to remove residual moisture.

[0082] S300 : spraying the first dense coating 40 on the connection between the pre-treated pole 20 and the upper plastic 30 , and spraying the second dense coating 50 on the connection between the upper plastic 30 and the top cover plate 10 .

[0083] Furthermore, the specific steps of spraying the first dense coating 40 on the connection between the pre-treated pole 20 and the upper plastic 30 and spraying the second dense coating 50 on the connection between the upper plastic 30 and the top cover plate 10 are as follows:

[0084] The assembly of the top cover plate 10, the pole 20 and the upper plastic 30 is loaded onto the spraying line.

[0085] The loading step can be completed manually, by automatic transport equipment or by automatic transport lines, and the specific selection can be flexibly made according to actual needs.

[0086] The spraying line conveys the assembly of the top cover plate 10 , the pole 20 and the upper plastic 30 to the surface treatment station, and performs pre-treatment and cleaning processes on the assembly of the top cover plate 10 , the pole 20 and the upper plastic 30 in sequence.

[0087] The pre-treatment specifically uses the emulsification principle of alkaline solution, and hydrolyzes the alkali solution to produce a large number of OH- ions. The OH- ions combine with the polar molecules of oil pollution and wrap up the polar molecules of oil pollution, so as to achieve the purpose of removing oil pollution on the surface of the assembly; then the acid solution is used for immersion treatment to form nano-scale holes on the surface of the assembly. Cleaning is to use ultrasonic cleaning equipment to further clean the assembly surface to make the assembly surface cleaner, so as to ensure that the nano-insulating material is easier to firmly adhere to the assembly surface in the next spraying process.

[0088] The spraying line continues to transport the assembly of the top cover plate 10, the pole 20 and the upper plastic 30 to the spraying station, and the spraying equipment automatically completes the spraying of the first dense coating 40 at the connection between the pole 20 and the upper plastic 30, and completes the spraying of the second dense coating 50 at the connection between the upper plastic 30 and the top cover plate 10.

[0089] The first dense coating layer 40 and the second dense coating layer 50 are subjected to a drying process.

[0090] For example, the assembly is sent into an oven, the baking temperature is set to 200° C., and the baking is performed for 5 seconds to allow the first dense coating 40 and the second dense coating 50 to be cured and attached.

[0091] In actual production, there is also a final packaging step, which is to use protective packaging materials to package the top cover assembly 100 to prevent bumps during transportation.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A top cover assembly, characterized in that: include: A top cover plate, the top cover plate comprising a first surface and a second surface opposite to each other, and a pole hole penetrating the first surface and the second surface; A pole, the pole comprising a chassis portion and a column portion connected to each other, the chassis portion being located on the side where the second surface of the top cover plate is located, the column portion being passed through the pole hole, and the column portion comprising a column end face disposed away from the chassis portion; and The upper plastic comprises a main body, a first extension and a second extension connected in sequence, the main body is located on the side where the first surface of the top cover plate is located and is arranged in contact with the circumferential side wall of the column, the first extension is located between the column and the hole wall of the pole hole and is in contact with the column and the hole wall of the pole hole, the second extension is located between the bottom plate and the second surface of the top cover plate and is in contact with the bottom plate and the second surface of the top cover plate; the main body comprises a first connection surface arranged away from the first surface, and a second connection surface arranged away from the column; Wherein, the end surface of the column and the first connecting surface are coated with a first dense coating, and the first surface and the second connecting surface are coated with a second dense coating.

2. The top cover assembly according to claim 1, characterized in that: The main body and / or the first extension portion include a first contact surface facing the columnar portion, the first contact surface and one of the circumferential side walls of the columnar portion are provided with a first groove, the first contact surface and the other of the circumferential side walls of the columnar portion are provided with a first protrusion, and the first protrusion is inserted into the first groove.

3. The top cover assembly according to claim 1, characterized in that: The main body includes a second contact surface disposed away from the first connection surface, one of the second contact surface and the first surface is provided with a second groove, the other of the second contact surface and the first surface is provided with a second protrusion, and the second protrusion is inserted into the second groove.

4. The top cover assembly according to claim 1, characterized in that: The top cover assembly also includes a lower plastic, which is located on the side of the second surface of the top cover plate. The lower plastic includes a third extension portion, which is located between the bottom plate and the second surface of the top cover plate and adheres to the bottom plate and the second surface of the top cover plate. The end surface of the third extension portion contacts the end surface of the second extension portion.

5. The top cover assembly according to claim 1, characterized in that: The upper plastic is formed between the top cover plate and the pole by injection molding; The first dense coating and the second dense coating are both formed on the exterior surface of the top cover assembly.

6. The top cover assembly according to claim 1, characterized in that: The end surface of the column and the first connecting surface are both formed with a first nanopore structure, and the first nanopore structure is filled and combined with the first dense coating; and / or, A second nanopore structure is formed on both the first surface and the second connection surface, and the second nanopore structure is filled and combined with the second dense coating.

7. The top cover assembly according to claim 1, characterized in that: The thickness of the first dense coating ranges from 0.04 mm to 0.3 mm; The first dense coating has a ring-shaped structure, and the width of the first dense coating ranges from 3 mm to 9 mm.

8. The top cover assembly according to claim 1, characterized in that: The thickness of the second dense coating ranges from 0.04 mm to 0.3 mm; The second dense coating includes a first coating portion combined with the main body of the upper plastic and a second coating portion combined with the first surface of the top cover plate. The height range of the first coating portion is 1 mm to 2.5 mm, and the width range of the second coating portion is 1.5 mm to 6.5 mm.

9. A battery cell, characterized in that: include: A housing having a mounting cavity and an inlet and outlet connected to each other; A battery cell, wherein the battery cell is installed in the installation cavity; as well as, The top cover assembly according to any one of claims 1 to 8, wherein the top cover assembly is sealingly covered on the inlet and outlet, and the pole is electrically connected to the battery cell.

10. A battery module, characterized in that: Comprising the battery cell as claimed in claim 9.

11. A method for manufacturing a top cover assembly according to any one of claims 1 to 10, characterized in that: The steps include: After the top cover plate and the pole are assembled, the upper plastic is formed between the pole and the top cover plate through the injection molding process; The top cover plate, pole and plastic assembly are pre-treated by alkaline washing, pickling, T treatment and cleaning and drying processes in sequence; The first dense coating spraying process is completed on the connection between the pre-treated pole and the upper plastic, and the second dense coating spraying process is completed on the connection between the upper plastic and the top cover plate.

12. The method for processing a top cover assembly according to claim 11, characterized in that: The specific steps of spraying the first dense coating on the connection between the pre-treated pole and the upper plastic, and spraying the second dense coating on the connection between the upper plastic and the top cover are as follows: Load the top cover plate, pole and plastic coated assembly to the spraying line; The spraying line transports the top cover plate, pole and plastic assembly to the surface treatment station, and completes the pre-treatment and cleaning processes of the top cover plate, pole and plastic assembly in sequence; The spraying line continues to transport the assembly of the top cover plate, pole and upper plastic to the spraying station, and the spraying equipment automatically completes the first dense coating spraying at the connection between the pole and the upper plastic, and completes the second dense coating spraying at the connection between the upper plastic and the top cover plate; The first dense coating layer and the second dense coating layer are subjected to a drying process.

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