Top cover assembly, battery and electric device

Abstract

The utility model relates to battery technical field, concretely provides top cover subassembly, battery and electrical equipment, and top cover subassembly includes lid, pole and light curing coating, lid has first cover surface, and first cover surface is provided with the through -hole of the lid through lid, pole includes main part and step part, main part through hole, step part sets up in the side of lid with first cover surface, and connects main part, light curing coating includes first part and second part, first part sets up between the hole wall of main part's circumferential side wall and through -hole, and first part connects circumferential side wall and hole wall, second part sets up between the step surface of step part and first cover surface, and second part connects step surface and first cover surface, top cover subassembly, battery and electrical equipment of the utility model, replace conventional sealing ring through the setting light curing coating, realize reliable sealing between lid and pole, and high security.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to top cover components, batteries and electrical equipment. Background Technology

[0002] Lithium-ion batteries have been widely used due to their advantages such as high energy density, long cycle life, and no memory effect. With the development of the new energy industry, the demand for lithium-ion batteries continues to increase, and people are also paying more attention to their safety.

[0003] As one of the core components of a lithium battery, the sealing performance of the battery top cover has a significant impact on the overall performance and safety. In existing technologies, a pre-compression static sealing method is typically used to seal the battery top cover and terminals. However, the sealing rings used in pre-compression static sealing are prone to corrosion, aging, and deformation, leading to leaks in the top cover and affecting the safety of the lithium battery. Summary of the Invention

[0004] The top cover assembly, battery, and electrical equipment provided in this utility model embodiment at least solve the problem of easy leakage and low safety when the cover and the terminal are sealed by pre-compression static sealing. By setting a light-cured coating to replace the conventional sealing ring, a reliable seal between the cover and the terminal is achieved, resulting in high safety.

[0005] In a first aspect, the present invention provides a top cover assembly, including a cover body having a first cover surface, wherein a through hole is provided on the first cover surface; an electrode post including a main body portion and a stepped portion; the main body portion passing through the through hole; the stepped portion being disposed on the side of the cover body having the first cover surface and connected to the main body portion; and a photocurable coating including a first portion and a second portion; the first portion being disposed between the peripheral sidewall of the main body portion and the hole wall of the through hole, and the first portion connecting the peripheral sidewall and the hole wall; and the second portion being disposed between the stepped surface of the stepped portion and the first cover surface, and the second portion connecting the stepped surface and the first cover surface.

[0006] In one embodiment of the present invention, an insulating member is further included, disposed on the side of the cover having the first cover surface; the insulating member includes an insulating portion disposed between the step surface of the step portion and the first cover surface; the insulating portion is disposed around the second portion and connected to the second portion.

[0007] In one embodiment of the present invention, an insulating member is further included, disposed on the side of the cover having the first cover surface; the insulating member includes an insulating portion disposed between the step surface of the stepped portion and the first cover surface; the insulating portion is disposed around the second portion; wherein, a blocking protrusion is provided on the step surface of the stepped portion, the blocking protrusion is disposed around the main body portion; the blocking protrusion is disposed between the insulating portion and the second portion, and at least a portion of the second portion connects the blocking protrusion and the main body portion.

[0008] In one embodiment of this utility model, the blocking protrusion abuts against the first cover surface.

[0009] In one embodiment of the present invention, a gap is formed between the blocking protrusion and the first cover surface; a portion of the second part is accommodated in the gap and connects the main body and the insulating part.

[0010] In one embodiment of the present invention, the stepped surface is formed with a receiving groove, the receiving groove is disposed around the main body, at least a portion of the second portion is disposed in the receiving groove and connected to the groove wall surface of the receiving groove.

[0011] In one embodiment of this utility model, the portion of the cover body connected to the photocurable coating, and / or the portion of the pole connected to the photocurable coating, is provided with a rough surface.

[0012] In one embodiment of the present invention, the cover further includes a second cover surface disposed opposite to the first cover surface, and the through hole extends through the second cover surface; an injection molded part is disposed on one side of the cover having the second cover surface, and a portion of the injection molded part is disposed between the peripheral sidewall of the main body and the hole wall of the through hole, and is connected to the first portion.

[0013] In one embodiment of the present invention, a slot is provided on the peripheral sidewall of the main body, and a locking block is provided on the injection molded part, wherein the locking block is engaged with the slot.

[0014] Secondly, this utility model also provides a battery, including a top cover assembly as described in any of the above claims.

[0015] Thirdly, this utility model also provides an electrical device, including a battery as described in any of the above claims.

[0016] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0017] The top cover assembly, battery, and electrical device of this invention feature a photocurable coating between the cover and the terminals. This photocurable coating replaces conventional seals to achieve a seal between the cover and the terminals. Before curing, the photocurable coating is fluid and, under pressure, is compressed and filled between the peripheral walls of the main body and the walls of the through holes, as well as between the stepped surface of the stepped portion and the first cover surface. After the coating cures to form the photocurable coating, it achieves a seal between the main body and the through holes, and between the stepped portion and the cover. Compared to sealing through pre-compression seals, the photocurable coating provides a connection between the cover and the terminals. Sealing with the photocurable coating not only improves sealing performance but also makes the connection between the cover and the terminals more stable. This effectively improves the stability and safety of the top cover assembly manufacturing process, and also enhances the safety and reliability of the battery. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is one of the cross-sectional structural schematic diagrams of the top cover assembly in a preferred embodiment of this utility model.

[0020] Figure 2 This is one of the cross-sectional structural schematic diagrams of the photocurable coating in a preferred embodiment of this utility model.

[0021] Figure 3 This is the second cross-sectional structural schematic diagram of the photocurable coating in a preferred embodiment of this utility model.

[0022] Figure 4 This is the second cross-sectional structural schematic diagram of the top cover assembly in a preferred embodiment of this utility model.

[0023] Figure 5 This is one of the cross-sectional structural schematic diagrams of the pole in a preferred embodiment of this utility model.

[0024] Figure 6 This is a partial cross-sectional view of the top cover assembly in a preferred embodiment of the present invention.

[0025] Figure 7 This is the third cross-sectional structural schematic diagram of the top cover assembly in a preferred embodiment of this utility model.

[0026] Figure 8 This is the fourth cross-sectional structural schematic diagram of the top cover assembly in a preferred embodiment of this utility model.

[0027] Figure 9This is a partial cross-sectional view of the pole in a preferred embodiment of the present invention.

[0028] Figure 10 This is the fifth cross-sectional structural schematic diagram of the top cover assembly in a preferred embodiment of this utility model.

[0029] Figure 11 This is the sixth cross-sectional structural schematic diagram of the top cover assembly in a preferred embodiment of this utility model.

[0030] Figure 12 This is a schematic diagram of the pole structure in a preferred embodiment of the present invention.

[0031] Figure 13 This is the second cross-sectional structural schematic diagram of the pole in a preferred embodiment of this utility model.

[0032] Figure 14 This is a cross-sectional view of the battery casing in a preferred embodiment of the present invention.

[0033] The above figures include the following reference numerals:

[0034] 10—Shell; 11—Cover; 111—First cover; 1111—First slot; 112—Through hole; 1121—Hole wall; 113—Second cover; 1131—Second slot; 12—Pole post; 121—Main body; 1211—Side wall; 1212—Slot; 122—Step; 1221—Step surface; 1222—Blocking boss; 12221—Gap; 1223—Accommodating groove; 13—Photocurable coating; 131—First part; 132—Second part; 14—Insulating component; 141—Insulating part; 15—Rough surface; 16—Injection molded part; 161—Card block. Detailed Implementation

[0035] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] It should be noted that the 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 used only for the convenience of describing this utility model 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 this utility model.

[0038] It should be noted that the directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] It should be noted that the term "and / or" in this utility model 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. Unless otherwise specified, the term "or" in this utility model is inclusive. For example, the phrase "A or B" means "A, B, or both A and B"; more specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); or A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0040] It should be noted that the "range" disclosed in this utility model is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. This type of range can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit and combined with any other point or individual value, or with other lower or upper limits, to form an unspecified range.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0042] In high-power applications such as electric vehicles, battery applications involve three levels: individual battery cells, battery modules, and battery packs. Battery modules are formed by electrically connecting a certain number of individual battery cells and placing them in a frame to protect them from external impacts, heat, and vibration. Battery packs represent the final state of the battery system installed in an electric vehicle. Currently, most battery packs are made by assembling a battery management system (BMS), thermal management components, and various control and protection systems onto one or more battery modules. With technological advancements, the battery module level can be omitted, meaning that battery packs can be formed directly from individual battery cells. This improvement increases the gravimetric and volumetric energy density of the battery system while significantly reducing the number of components. The battery mentioned in this invention includes either a battery module or a battery pack.

[0043] In this invention, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this invention is not limited to these types. The battery cell may be cylindrical, flat, cuboid, or other shapes, and this invention is not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this invention is not limited to these types either.

[0044] A battery cell includes a casing, electrode assembly, and electrolyte. The electrode assembly and electrolyte are housed within the casing. 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 electrode plates. 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. The current collector without the positive active material layer protrudes beyond the current collector with the positive active material layer, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be 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. The current collector without the negative active material layer protrudes beyond the current collector with the negative active material layer, serving as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0045] There are no particular limitations on the aforementioned separator membrane; any known multi-channel separator membrane with electrochemical and chemical stability can be selected, such as a single-layer or multi-layer film of one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The material of the separator membrane can be polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; this embodiment of the invention is not limited to these.

[0046] Of course, a single battery cell may not necessarily include electrolyte.

[0047] To meet diverse power demands, a battery can comprise multiple individual cells, which can be connected in series, parallel, or a combination of both. Optionally, multiple individual cells can first be connected in series, parallel, or a combination to form a battery module, and then these battery modules can be connected in series, parallel, or a combination to form a battery. In other words, multiple individual cells can directly form a battery, or they can first be assembled into battery modules or battery packs, and then the battery modules can be assembled into a battery. The battery is then further installed in the electrical device to provide power to it.

[0048] The development of battery technology must consider multiple design factors simultaneously, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate, as well as safety. Among these, the battery's sealing performance has a significant impact on its overall performance and safety.

[0049] During battery manufacturing, the battery terminals need to be sealed to prevent problems such as electrolyte leakage, intrusion of external contaminants, and escape of internal gases.

[0050] Electrolyte leakage can reduce battery capacity, cause performance instability, accelerate aging, and even pose safety hazards. External contaminants such as moisture, dust, and chemicals entering the battery can affect chemical reactions, reducing efficiency and lifespan. Gas may be generated inside the battery during use; in cases of poor sealing, this gas may leak or accumulate, posing an explosion risk.

[0051] Good sealing performance is crucial for maintaining the normal operation of a battery. Specifically, a good seal prevents gas leakage, ensuring greater battery safety during use. A well-sealed battery maintains performance stability under different operating conditions, reducing performance fluctuations caused by environmental changes and ensuring optimal performance in various usage scenarios. A well-sealed battery reduces the risk of malfunctions and leaks, thereby lowering maintenance and replacement costs.

[0052] Leakage rate is one of the direct evaluation criteria for sealing performance. A significant increase in leakage rate is considered to indicate a loss of seal reliability. In the field of static sealing, leakage between the two sealing surfaces is called interface leakage, which is a major cause of seal failure. Interface leakage refers to the presence of macroscopic ripples and microscopic surface roughness on two visually well-fitting surfaces when they are in contact, meaning there is no perfectly fitted contact condition. Therefore, due to the existence of these non-contact areas, leakage paths exist between the two surfaces. To reduce the leakage rate, it is necessary to block the leakage paths as much as possible to prevent the sealing medium from passing through the leakage channels between the sealing surfaces, thereby achieving better sealing performance.

[0053] In existing technologies, pre-compression static sealing is commonly used to seal the battery terminals. In pre-compression static sealing, an annular seal made of rubber elastomer is placed between the sealing surfaces. A preload is applied to compress the sealing surfaces, causing the elastomer to deform and fill any leakage channels, thus achieving a seal.

[0054] To ensure the compressive deformation of the elastomer, a preload needs to be continuously applied during assembly. When the preload increases to a certain value, the leakage rate remains relatively stable, effectively preventing interface leakage and thus achieving good sealing performance.

[0055] However, the aging of sealing materials has a significant impact on sealing performance. The resilience of elastomers can be affected by chain rearrangement, oxidation, chain breakage, and additional cross-linking, leading to stress relaxation under constant strain. This results in the loss of compression deformation over time, creating leakage channels and causing leaks, which in turn affect battery safety.

[0056] To solve the above problems, refer to Figure 1 As shown, this utility model embodiment provides a top cover assembly, including a cover body 11, an electrode post 12, and a photocurable coating 13.

[0057] The cover 11 is used to seal against the housing 10 and to accommodate components such as electrode assemblies and electrolyte. Those skilled in the art can determine the shape of the cover 11 according to actual needs, such as circular or rectangular. Those skilled in the art can also determine the material of the cover 11 according to actual needs, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0058] The cover 11 has a first cover surface 111 and a second cover surface 113. Preferably, the first cover surface 111 and the second cover surface 113 are arranged opposite to each other along the thickness direction of the cover 11, with the first cover surface 111 being the inner surface of the cover 11 and the second cover surface 113 being the outer surface of the cover 11. A through hole 112 is provided on the first cover surface 111 of the cover 11, which is used to install the pole post 12. Preferably, the axial direction of the through hole 112 is parallel to the thickness direction of the cover 11, that is, the through hole 112 extends to the second cover surface 113.

[0059] The terminal post 12 is a key component connecting the inside and outside of the battery, used for conducting current. The terminal post 12 includes a main body 121 and a stepped portion 122. The main body 121 extends through a through hole 112. Along the thickness direction of the cover 11, the size of the through hole 112 is smaller than the size of the main body 121. Those skilled in the art can customize the shape of the main body 121 according to actual needs, such as a cylinder, a cuboid, etc. Preferably, the axis of the main body 121 coincides with the axis of the through hole 112. The stepped portion 122 is provided on the side of the cover 11 having a first cover surface 111 and connects to the main body 121. Along the thickness direction perpendicular to the cover 11, the size of the main body 121 is smaller than the size of the stepped portion 122.

[0060] Those skilled in the art can configure the connection method between the main body 121 and the stepped portion 122 according to actual needs, for example, by welding or by integral molding. Specifically, when the electrode post 12 is a positive electrode post, the main body 121 and the stepped portion 122 are integrally molded, and both the main body 121 and the stepped portion 122 are made of aluminum; when the electrode post 12 is a negative electrode post, the main body 121 and the stepped portion 122 are connected by friction welding, and the main body 121 is made of aluminum, while the stepped portion 122 is made of copper. In the battery, the stepped portion 122 is directly electrically connected to the tab of the electrode assembly, or the stepped portion 122 and the tab of the electrode assembly are electrically connected separately through an adapter piece, and the main body 121 is electrically connected to the outside of the battery.

[0061] A photocurable coating 13 is used to replace the seals in a conventional battery, achieving a seal between the terminal post 12 and the cover 11. Specifically, the photocurable coating 13 includes a first portion 131 and a second portion 132. The first portion 131 is disposed between the peripheral sidewall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, and the first portion 131 connects the peripheral sidewall 1211 and the hole wall 1121, achieving a seal between the main body 121 and the through hole 112. The second portion 132 is disposed between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111, and the second portion 132 connects the stepped surface 1221 and the first cover surface 111, achieving a seal between the stepped portion 122 and the cover 11.

[0062] In this context, the peripheral sidewall 1211 of the main body 121 refers to the circumferential side surface of the main body 121. For example, when the main body 121 is a cylinder with its axis aligned with the cylinder, the peripheral sidewall 1211 is the cylindrical surface of the cylinder. The first portion 131 of the photocurable coating 13 can fill the gap between the peripheral sidewall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, or it can only fill a portion of the gap. The stepped surface 1221 is the surface of the stepped portion 122 that is close to the first cover surface 111 along the thickness direction of the cover 11. The second portion 132 of the photocurable coating 13 can fill the gap between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111, or it can only fill a portion of the gap.

[0063] In this embodiment of the invention, the photocurable coating 13 is applied using a coating process. For example, before the cover 11 and the electrode post 12 are assembled, the coating material corresponding to the photocurable coating 13 can be applied to the step surface 1221 of the stepped portion 122 using a coating process. Then, the main body 121 is inserted into the through hole 112 of the cover 11. Next, pressure is applied to the cover 11 and the electrode post 12. Before curing, the coating material is a fluid with a certain degree of fluidity. Under pressure, the coating material is compressed and filled between the peripheral wall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, and between the step surface 1221 of the stepped portion 122 and the first cover surface 111. Finally, the coating material is cured by ultraviolet light to form the photocurable coating 13, thus achieving a seal between the main body 121 and the through hole 112, and a seal between the stepped portion 122 and the cover 11.

[0064] It should be noted that the application location of the coating is not limited during actual assembly. Besides applying the coating to the stepped surface 1221, the coating can also be applied to the first cover surface 111 of the cover 11, the hole wall 1121 of the through hole 112, and the peripheral sidewall 1211 of the main body 121. For example, coating is applied to the stepped surface 1221 of the stepped portion 122 and the first cover surface 111 of the cover 11 to form a UV-cured coating 13.

[0065] In existing technologies, conventional seals are in surface contact with the corresponding cover and pole, without any connection. In this case, the seal between the cover 11 and the pole 12 relies primarily on the rebound force of the seal after pre-compression to block the leakage path and prevent leakage. This places high demands on the compression of the seal and cannot guarantee that the sealing ring will not experience stress relaxation during use. Once stress relaxation occurs in the seal, insufficient rebound force can lead to a risk of leakage.

[0066] In the top cover assembly described in this utility model, the photocurable coating 13 is connected to the cover body 11 and the terminal post 12. Based on this, by setting the photocurable coating 13, not only is the sealing performance improved, but the connection between the cover body 11 and the terminal post 12 is also made more stable. This effectively improves the stability and safety of the manufacturing process, and also improves the safety and reliability of the battery.

[0067] Those skilled in the art can set the material of the photocurable coating 13 according to actual needs. Preferably, a corrosion-resistant and insulating material is selected to prepare the photocurable coating 13.

[0068] The top cover assembly of this invention features a photocurable coating 13 between the cover body 11 and the pole post 12. This photocurable coating 13 replaces conventional seals to achieve a seal between the cover body 11 and the pole post 12. Before curing, the photocurable coating 13 is fluid and, under pressure, is compressed and filled between the peripheral sidewall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, as well as between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111. After the coating cures to form the photocurable coating 13, a seal is achieved between the main body 121 and the through hole 112, and between the stepped portion 122 and the cover body 11. Compared to sealing through pre-compression seals, the photocurable coating 13 provides a connection between the cover body 11 and the pole post 12. Sealing with the photocurable coating 13 not only improves the sealing performance but also makes the connection between the cover body 11 and the pole post 12 more stable. This effectively improves the stability and safety of the component manufacturing process, as well as the safety and reliability of the battery.

[0069] Considering the presence of electrolyte inside the battery, in order to ensure the seal between the cover 11 and the terminal post 12 while further improving the safety and reliability of the battery, the material of the photocurable coating 13 must not fail for a long time in the electrolyte environment.

[0070] Reference Figure 2 and Figure 3 As shown, in some embodiments of the top cover assembly of this utility model, the material of the photocurable coating 13 includes polybutadiene rubber and liquid polysulfides. Both polybutadiene rubber and liquid polysulfides are existing materials.

[0071] Polybutadiene rubber is characterized by high elasticity, good low-temperature resistance, excellent wear resistance, low hysteresis loss, low heat generation, good flexural strength, good compatibility with other rubbers, good filling performance, strong shear resistance when mixed with other materials, and good in-mold flow performance.

[0072] Liquid polysulfides are a class of polymers with unique chemical properties, primarily composed of sulfur, and typically exist as low-viscosity liquids. Liquid polysulfides consist of multiple sulfur atoms linked by sulfur-sulfur bonds to form a chain structure. The chain length and the amount of sulfur can vary, affecting their physical and chemical properties. By adjusting the polymerization conditions and formulation of liquid polysulfides, their molecular weight and chain structure can be controlled, thereby regulating their performance.

[0073] Liquid polysulfides possess excellent self-healing capabilities, enabling them to repair themselves after damage through dynamic recombination of sulfur bonds. They typically have low viscosity, facilitating processing and molding, making them suitable for applications such as photocurable coatings, sealants, and adhesives. Liquid polysulfides exhibit good resistance to various chemicals, including solvents, oils, and water, making them suitable for applications in harsh environments. They demonstrate good thermal stability at high temperatures, decomposing only at extremely high temperatures. After curing, liquid polysulfides form elastomers with excellent elasticity and resilience. Some liquid polysulfides can be biodegraded or treated to render them harmless, exhibiting good environmental friendliness. Liquid polysulfides can be cured through photopolymerization and crosslinking reactions to form solid materials with superior properties. Therefore, liquid polysulfides are widely used in sealants, adhesives, coatings, electronic packaging materials, and self-healing materials.

[0074] Based on this, polybutadiene rubber and liquid polysulfides are particularly suitable for sealing between the cap 11 and the pole 12. Specifically, mixing polybutadiene rubber and liquid polysulfides can produce a composite material with excellent properties.

[0075] Self-healing ability: The dynamic sulfur bond characteristics of strong liquid polysulfides can endow polybutadiene rubber with self-healing ability, enabling the photocurable coating 13 to self-repair after being damaged by light stimulation.

[0076] Good mechanical properties: The addition of liquid polysulfides can improve the strength, toughness and wear resistance of polybutadiene rubber, and improve the performance of the photocurable coating 13 under extreme conditions.

[0077] Excellent low-temperature performance: Polybutadiene rubber itself has good low-temperature performance. When mixed with liquid polysulfides, it can further improve the flexibility of the UV-cured coating 13 in low-temperature environments.

[0078] Good chemical stability: The photocurable coating 13 made of polybutadiene rubber and liquid polysulfides generally exhibits good resistance to a variety of chemicals and is suitable for use in harsh environments.

[0079] Adjustable rheology: The addition of liquid polysulfides can adjust the rheology of the material, making it easier to shape during processing.

[0080] Photocurability: The photocuring properties of liquid polysulfides can be combined with the photocrosslinking properties of polybutadiene rubber to form a stronger and more durable material. Furthermore, both polybutadiene rubber and liquid polysulfides can achieve rapid crosslinking in a short time, facilitating mass production.

[0081] When assembling the cover 11 and the pole post 12, a coating can be applied to the corresponding surfaces of the cover 11 and / or the pole post 12, and pressure is applied to the cover 11 and the pole post 12 to achieve pre-tightening. The coating is clamped and filled between the peripheral sidewall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, and between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111. Subsequently, a certain environmental stimulus, such as ultraviolet light, is applied to the coating, causing the coating to bond to the cover 11 and the pole post 12 respectively, and curing to obtain a photocurable coating 13 and achieve sealing.

[0082] In this embodiment of the invention, the coating is cured by ultraviolet light to form a light-cured coating 13, thereby achieving a seal.

[0083] For example, during production, equal masses of polybutadiene rubber and liquid polysulfide can be mixed and stirred, and a certain mass of photoinducer can be added for secondary mixing to obtain a coating. The coating has a certain fluidity in its uncured state, which can better fill the gap 12221 between the corresponding surfaces of the cap 11 and the pole 12, avoiding the formation of microscopic leakage channels.

[0084] During assembly, the coating simply needs to be applied to the corresponding surfaces. Compared to conventional seals, the application process is simpler and avoids the risk of leakage caused by insufficient compression area due to misalignment during assembly. Furthermore, while the coating also requires a certain amount of pressure for pre-tightening, the pressure requirement is much lower than that of conventional seals. Therefore, the risk of leakage due to insufficient compression of conventional seals can be avoided.

[0085] When stimulated by ultraviolet light, the polymer diffuses more rapidly at the interface where the coating contacts the cap 11 and the electrode post 12, forming stable chemical bonds between the terminal reactive groups. The interaction between the polymers creates bonds at the contact interface, resulting in stable contact and a reliable seal. Compared to conventional seals, there is no risk of leakage due to material aging or insufficient resilience, and it can remain effective for a long time even in electrolyte environments.

[0086] Reference Figure 2 As shown, in some embodiments of the top cover assembly of this utility model, the portion of the cover 11 that connects to the photocurable coating 13, and / or the portion of the pole 12 that connects to the photocurable coating 13, is provided with a rough surface 15. Thus, there are three possible cases.

[0087] The first type: a rough surface 15 is provided only at the part of the cover 11 where the light-cured coating 13 is connected.

[0088] The second type: a rough surface 15 is provided only at the part where the pole post 12 connects to the photocurable coating 13.

[0089] The third type: a rough surface 15 is provided at both the part of the cover 11 where the photocurable coating 13 is connected and the part of the pole 12 where the photocurable coating 13 is connected.

[0090] Those skilled in the art can determine the processing method of the roughened surface 15 according to actual needs. Preferably, the surface roughness is increased by laser treatment of the corresponding surface. On this basis, the photocurable coating 13 can be tightly bonded to the roughened surface 15, effectively improving the connection strength between the cover 11 and the pole post 12.

[0091] In some other embodiments, a similar effect can be achieved by providing recesses at the location where the cover 11 connects to the photocurable coating 13, or / and at the location where the pole 12 connects to the photocurable coating 13, instead of the rough surface 15.

[0092] Reference Figure 4 As shown, in some embodiments of the top cover assembly of this utility model, an insulating member 14 is further included to insulate the cover body 11 from the electrode post 12. The insulating member 14 is disposed on the side of the cover body 11 with the first cover surface 111, which is the side of the cover body 11 relatively close to the electrode assembly in the battery. In addition, the insulating member 14 also serves to support and protect the electrode assembly. Preferably, the insulating member 14 is connected to the first cover surface 111 of the cover body 11.

[0093] The insulating member 14 includes an insulating portion 141, which is disposed between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111. The insulating portion 141 surrounds and connects to the second portion 132. Preferably, a first slot 1111 for adapting the insulating portion 141 is provided on the first cover surface 111 of the cover body 11. The first slot 1111 is used to avoid and accommodate the insulating portion 141.

[0094] Before assembling the cover 11 and the pole post 12, the cover 11 and the insulating member 14 are assembled first, such that the insulating portion 141 of the insulating member 14 is installed in the first slot 1111. Then, the pole post 12 is assembled, such that the main body portion 121 of the pole post 12 passes through the through hole 112 of the cover 11, and the stepped surface 1221 of the stepped portion 122 abuts against the insulating portion 141. By applying pressure to the cover 11 and the pole post 12, the coating between the cover 11 and the pole post 12 is clamped and filled between the peripheral sidewall 1211 of the main body portion 121 and the hole wall 1121 of the through hole 112, and between the stepped surface 1221 of the stepped portion 122 and the first cover surface 111. After the coating cures to form a photocurable coating 13, the second part 132, in addition to connecting the cover 11 and the pole post 12, is also connected to the insulating portion 141.

[0095] By setting up this structure, the stability of the component can be further enhanced by connecting the second part 132 with the insulating part 141 while ensuring the component's sealing performance, thereby improving the safety and reliability of the battery.

[0096] Reference Figure 5 As shown, in some embodiments of the top cover assembly of this utility model, an insulating member 14 is also provided on one side of the cover body 11 having a first cover surface 111. The insulating member 14 includes an insulating portion 141, which is disposed between the step surface 1221 of the stepped portion 122 and the first cover surface 111, and surrounds the second portion 132. The difference is that a blocking protrusion 1222 is provided on the step surface 1221 of the stepped portion 122, and the blocking protrusion 1222 surrounds the main body portion 121. When the paint is applied to the step surface 1221 of the stepped portion 122 and the paint has not yet cured, the blocking protrusion 1222 can block the paint and prevent the paint from flowing freely.

[0097] After assembling the cover 11 and the electrode post 12, a blocking boss 1222 is disposed between the insulating portion 141 and the second portion 132, and at least a portion of the second portion 132 connects the blocking boss 1222 and the main body portion 121. It is understandable that after assembly, although the contact surfaces of the stepped portion 122 and the insulating member 14 can fit together, electrolyte will inevitably enter between the two surfaces. By providing the blocking boss 1222, the sealing effect of the assembly can be effectively enhanced, and the leakage path of the electrolyte can be extended. That is, after the electrolyte reaches the stepped surface 1221 of the stepped portion 122, it needs to move along the outer wall surface of the blocking boss 1222 before it can contact the photocurable coating 13.

[0098] Since a blocking protrusion 1222 is provided on the stepped surface 1221, the connection between the second part 132 and the insulating part 141 will be different depending on the size of the blocking protrusion 1222 along the thickness direction of the cover 11. The following analysis will be conducted for both cases.

[0099] In some embodiments, refer to Figure 6 and Figure 7 As shown, a gap 12221 is formed between the blocking boss 1222 and the first cover surface 111. Part of the second portion 132 is accommodated in the gap 12221 and connects the main body portion 121 and the insulating portion 141. At this time, in addition to being limited by the mating of the stepped surface 1221 and the first cover surface 111, the insulating member 14 can also be connected to the photocurable coating 13, further enhancing the stability of the component, thereby improving the safety and reliability of the battery.

[0100] In some embodiments, refer to Figure 8 As shown, the blocking boss 1222 abuts against the first cover surface 111.

[0101] Compared to a structure where a gap 12221 is formed between the blocking boss 1222 and the first cover surface 111, by having the blocking boss 1222 abut against the first cover surface 111, the blocking boss 1222 can be used to limit the position of the cover 11 and the pole post 12 during the assembly process. For example, during the assembly process, pressure is applied to the cover 11 and the pole post 12 until the blocking boss 1222 abuts against the first cover surface 111.

[0102] Simultaneously, the blocking boss 1222 can block the insulating component 14. It is understood that the insulating component 14 is located inside the battery and immersed in the electrolyte; prolonged immersion will cause the insulating component 14 to expand. By providing the blocking boss 1222 between the insulating portion 141 of the insulating component 14 and the photocurable coating 13, the photocurable coating 13 can be protected, buffered, and prevented from being directly deformed by force. This effectively enhances the stability of the component, thereby improving the safety and reliability of the battery.

[0103] Reference Figure 9 and Figure 10 As shown, in some embodiments of the top cover assembly of this utility model, the stepped surface 1221 is formed with a receiving groove 1223, which surrounds the main body 121. At least a portion of the second part 132 is disposed within the receiving groove 1223 and connected to the groove wall surface of the receiving groove 1223.

[0104] By providing the receiving groove 1223, the coating can be applied to the receiving groove 1223 before assembling the cover 11 and the terminal post 12. The receiving groove 1223 provides space for the coating and restricts the uncured coating from flowing freely and spreading in all directions. After the coating cures to form the photocurable coating 13, if the terminal post 12 is impacted, the receiving groove 1223 can limit the deformation of the photocurable coating 13 caused by the force, preventing the seal between the cover 11 and the terminal post 12 from failing, thereby improving the safety and reliability of the battery.

[0105] It should be noted that in some embodiments, both the receiving groove 1223 and the blocking protrusion 1222 can be provided simultaneously. For example, the dimension between the inner wall surface of the blocking protrusion 1222 and the peripheral sidewall 1211 of the main body 121, and the width of the receiving groove 1223 can be set to be equal to accommodate more paint. Alternatively, the width of the receiving groove 1223 can be set to be smaller than the dimension between the inner wall surface of the blocking protrusion 1222 and the peripheral sidewall 1211 of the main body 121, forming a stepped structure.

[0106] Reference Figure 11 As shown, in some embodiments of the top cover assembly of this utility model, an injection molded part 16 is provided on one side of the cover body 11 having a second cover surface 113. Part of the injection molded part 16 is disposed between the peripheral sidewall 1211 of the main body 121 and the hole wall 1121 of the through hole 112, and is connected to the first part 131.

[0107] By incorporating the injection-molded part 16, the connection stability between the terminal post 12 and the cover 11 is increased, securing the terminal post 12 stably in a preset position and preventing it from shifting or loosening due to vibration, impact, or other external forces during use, thus ensuring a reliable connection between the terminal post 12 and the outside. Furthermore, it enhances the sealing performance of the assembly. By encasing the terminal post 12 with the injection-molded part 16 and filling the gap between the terminal post 12 and the cover 11, not only is internal leakage prevented, but external moisture, dust, and other contaminants are also prevented from entering the battery.

[0108] Preferably, the injection molded part 16 is injection molded using polyphenylene sulfide (PPS). Polyphenylene sulfide has excellent electrical insulation properties and can work well with the UV-cured coating 13 to achieve both sealing and insulation between the cover 11 and the terminal post 12, preventing accidental contact that could lead to a short circuit.

[0109] Preferably, the second cover surface 113 is provided with a second slot 1131 adapted to the injection molded part 16. The second slot 1131 restricts the movement of the injection molded part 16 relative to the cover body 11, thereby further increasing the connection stability between the pole post 12 and the cover body 11.

[0110] Furthermore, refer to Figure 12 and Figure 13 As shown, in some embodiments of the top cover assembly of this utility model, a slot 1212 is provided on the peripheral sidewall 1211 of the main body 121, and a locking block 161 is provided on the injection molded part 16. The locking block 161 is engaged with the slot 1212. Through the cooperation of the slot 1212 and the locking block 161, the connection stability between the pole post 12 and the injection molded part 16 can be effectively increased, preventing the injection molded part 16 from detaching from the pole post 12.

[0111] Those skilled in the art can set the number of slots 1212 and blocks 161 according to actual needs. For example, only one annular slot 1212 and one annular block 161 can be set to achieve a snap-fit ​​connection. Preferably, multiple slots 1212 are provided. Multiple slots 1212 are evenly spaced along the circumference of the main body 121. Correspondingly, multiple blocks 161 are also provided on the injection molded part 16, and each is connected to a corresponding slot 1212.

[0112] Reference Figure 14 As shown, this embodiment of the present invention also provides a battery, including a housing and an electrode assembly disposed within the housing. The housing includes a casing 10 and a top cover assembly as described in any of the above embodiments. The casing 10 has an opening, which is sealed by the top cover assembly. Since the battery of this invention includes the top cover assembly described in the above embodiments, it also possesses all the beneficial effects described herein, and will not be repeated here.

[0113] In some other embodiments, the battery can also have a similar top cover assembly structure in other parts of the casing to achieve the same effect.

[0114] For example, the housing 10 has a first housing surface, on which a through hole 112 is provided. The pole post 12 includes a main body portion 121 and a stepped portion 122. The main body portion 121 extends through the through hole 112, and the stepped portion 122 is disposed on the side of the housing 10 having the first housing surface and is connected to the main body portion 121. The photocurable coating 13 includes a first portion 131 and a second portion 132. The first portion 131 is disposed between the peripheral sidewall 1211 of the main body portion 121 and the hole wall 1121 of the through hole 112, and the first portion 131 connects the peripheral sidewall 1211 and the hole wall 1121. The second portion 132 is disposed between the stepped surface 1221 of the stepped portion 122 and the first housing surface, and the second portion 132 connects the stepped surface 1221 and the first housing surface.

[0115] This utility model embodiment also provides an electrical device, including at least one battery as described in any of the above embodiments.

[0116] Electrical equipment can include automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of this utility model do not impose special limitations on the above-mentioned electrical equipment.

[0117] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0118] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0119] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A top cover assembly, characterized in that, include: The cover (11) has a first cover surface (111) and a through hole (112) is provided on the first cover surface (111) through the cover (11). The pole post (12) includes a main body (121) and a stepped part (122); the main body (121) passes through the through hole (112); the stepped part (122) is disposed on the side of the cover (11) having the first cover surface (111) and is connected to the main body (121). The photocurable coating (13) includes a first part (131) and a second part (132); the first part (131) is disposed between the peripheral sidewall (1211) of the main body (121) and the hole wall (1121) of the through hole (112), and the first part (131) connects the peripheral sidewall (1211) and the hole wall (1121); the second part (132) is disposed between the step surface (1221) of the stepped part (122) and the first cover surface (111), and the second part (132) connects the step surface (1221) and the first cover surface (111).

2. The top cover assembly according to claim 1, characterized in that, Also includes: An insulating element (14) is disposed on one side of the cover body (11) having the first cover surface (111); the insulating element (14) includes an insulating portion (141) disposed between the stepped surface (1221) of the stepped portion (122) and the first cover surface (111); the insulating portion (141) is disposed around the second portion (132) and connected to the second portion (132).

3. The top cover assembly according to claim 1, characterized in that, Also includes: An insulating element (14) is disposed on one side of the cover body (11) having the first cover surface (111); the insulating element (14) includes an insulating portion (141) disposed between the stepped surface (1221) of the stepped portion (122) and the first cover surface (111); the insulating portion (141) is disposed around the second portion (132); Wherein, a blocking boss (1222) is provided on the step surface (1221) of the step portion (122), the blocking boss (1222) is provided around the main body portion (121); the blocking boss (1222) is provided between the insulating portion (141) and the second portion (132), and at least a portion of the second portion (132) connects the blocking boss (1222) and the main body portion (121).

4. The top cover assembly according to claim 3, characterized in that: The blocking protrusion (1222) abuts against the first cover surface (111); or, A gap (12221) is formed between the blocking boss (1222) and the first cover surface (111); a portion of the second part (132) is accommodated in the gap (12221) and connects the main body part (121) and the insulating part (141).

5. The top cover assembly according to any one of claims 1 to 4, characterized in that: The stepped surface (1221) is formed with a receiving groove (1223), the receiving groove (1223) is arranged around the main body (121), and at least part of the second part (132) is arranged in the receiving groove (1223) and connected to the groove wall surface of the receiving groove (1223).

6. The top cover assembly according to claim 1, characterized in that: The portion of the cover (11) that connects to the photocurable coating (13), and / or the portion of the pole (12) that connects to the photocurable coating (13) is provided with a rough surface (15).

7. The top cover assembly according to claim 1, characterized in that: The cover (11) also includes a second cover (113) disposed opposite to the first cover (111), and the through hole (112) extends through the second cover (113). The cover (11) has an injection molded part (16) on one side of the second cover surface (113). A portion of the injection molded part (16) is disposed between the peripheral sidewall (1211) of the main body (121) and the hole wall (1121) of the through hole (112), and is connected to the first part (131).

8. The top cover assembly according to claim 7, characterized in that: A slot (1212) is provided on the peripheral sidewall (1211) of the main body (121), and a block (161) is provided on the injection molded part (16), and the block (161) is engaged with the slot (1212).

9. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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