End cap assembly, battery, battery pack, and electric device

Abstract

The application provides an end cover assembly, a battery, a battery pack and an electric device, and relates to the technical field of batteries. The end cover assembly comprises a cover plate, the cover plate is provided with a mounting hole, the size of the mounting hole along a first direction is greater than the size of the mounting hole along a second direction, and the first direction and the second direction are perpendicular to each other, the cover plate is further provided with a pressing flange surrounding the mounting hole, the pressing flange comprises two first side edges opposite along the first direction and two second side edges opposite along the second direction, and a gap is formed at the intersection position of the first side edge and the second side edge; a pole is arranged; an insulation assembly is arranged between the pole and the cover plate, the inner edge of the insulation assembly abuts against the outer peripheral wall of the pole, and the outer edge of the insulation assembly is provided with an extension part at a position corresponding to the gap, the extension part covers at least part of the gap, the end cover assembly of the application covers the gap of the cover plate through the extension part, effectively prevents foreign matters such as metal chips from entering the inside of the battery, and improves the sealing reliability and safety, and has the advantages of preventing short circuit risk and prolonging the service life of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to an end cap assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] With the rapid development of new energy vehicles, the demand for fast charging of energy storage devices is also increasing. Currently, in order to achieve fast charging, the voltage of the battery pack is usually designed to be higher. This requires more batteries to be connected in series within the limited space of the battery pack, resulting in the battery thickness gradually becoming thinner. To meet the fast charging requirements, batteries have begun to use irregularly shaped terminals.

[0003] In related technologies, when fixing irregularly shaped terminals to a cover plate, irregularly shaped terminal holes are made in the cover plate, and a flange structure is set around the terminal holes to press and fix the terminal and sealing components. Taking an elliptical terminal hole with inconsistent long and short sides as an example, because the dimensions of the long and short sides are different, the junction of the long and short sides will be subjected to forces in different directions during the formation of the flange structure. This makes it easy for gaps to appear at the junction of the long and short sides, which in turn allows foreign objects such as metal shavings to easily enter the battery through the gaps during battery assembly, posing a short circuit risk. Utility Model Content

[0004] In view of the above problems, the present invention provides an end cap assembly, a battery, a battery pack and an electrical device, which can avoid the problem of the battery cell being too thick due to the formation of multiple layers of insulating film on the battery cell, thereby avoiding the difficulty of battery cell installation and avoiding the problem of damaging the battery cell.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A first aspect of this utility model provides an end cap assembly for a battery, comprising:

[0007] A cover plate is provided with a mounting hole. The size of the mounting hole along a first direction is larger than that along a second direction. The first direction and the second direction are perpendicular to each other. The cover plate is also provided with a pressing flange surrounding the mounting hole. The pressing flange includes two first side edges opposite to each other along the first direction and two second side edges opposite to each other along the second direction. A notch is formed at the junction of the first side edges and the second side edges.

[0008] A terminal post, which passes through the mounting hole;

[0009] The insulating component is disposed between the pole post and the cover plate. The inner edge of the insulating component abuts against the outer peripheral wall of the pole post. An extension is provided at the position corresponding to the notch on the outer edge of the insulating component, and the extension covers at least part of the notch.

[0010] In an alternative implementation, the extension abuts against the inner edge of the notch.

[0011] In an optional embodiment, along the second direction, there is a gap between the side edge of the extension facing the notch and the side edge of the notch facing the extension;

[0012] The interval is greater than or equal to 0.1 mm and less than or equal to 3 mm.

[0013] In an optional implementation, the extension has a dimension greater than or equal to 0.4 mm and less than or equal to 3 mm along the first direction.

[0014] In one alternative embodiment, the insulating component and the extension are integrally formed.

[0015] In one alternative embodiment, the extension is made of a colloid.

[0016] In an optional embodiment, the thermal conductivity of the colloid is greater than or equal to 0.1 W / (mK) and less than or equal to 1.5 W / (mK).

[0017] In an optional embodiment, the colloid is further doped with metal particles, which are uniformly distributed in the colloid.

[0018] In an optional embodiment, the cover plate has a recessed side surface facing away from the battery interior to form a mounting platform, the mounting platform being larger in dimension along the first direction than in dimension along the second direction, the mounting hole being disposed on the mounting platform, and the pressing flange being disposed around the mounting platform.

[0019] In one optional embodiment, the pole post includes a pole post body and a support protrusion ring disposed on the outer peripheral wall of the pole post body, the support protrusion ring being supported on the mounting platform, and the insulating assembly wrapping around the outer edge of the support protrusion ring.

[0020] In one optional embodiment, the electrode post includes an electrode post body and an injection hole disposed on the electrode post body. The injection hole is connected to the interior of the battery to inject electrolyte into the interior of the battery through the injection hole.

[0021] In an optional embodiment, the pressing flange includes a bent portion; the bent portion presses against the insulating component and is located on the side of the supporting protrusion opposite to the mounting platform.

[0022] In an optional embodiment, the pressing flange further includes a body portion; a first end of the body portion is connected to the cover plate, and a second end of the body portion extends along the thickness direction of the cover plate and is connected to the curved portion, the curved portion being perpendicular to the body portion.

[0023] In an optional embodiment, the insulating assembly includes a first insulating member disposed between the supporting protrusion and the pressing flange.

[0024] In an optional embodiment, the support ring includes a first surface facing the mounting platform along the thickness direction of the cover plate and a second surface facing the pressing flange;

[0025] The inner edge of the first insulating member abuts against the second surface of the supporting protrusion ring, and the extension is provided at the position corresponding to the notch on the outer edge of the first insulating member.

[0026] In an optional embodiment, the first insulating member includes a first insulating segment, a second insulating segment, and a transition connecting segment connected together. The first insulating segment is disposed between the first surface and the mounting platform, the second insulating segment is sandwiched between the second surface and the curved portion, and the transition connecting segment is disposed between the peripheral wall of the supporting protrusion ring and the body portion, with both ends of the transition connecting segment connected to the first insulating segment and the second insulating segment, respectively.

[0027] In an optional embodiment, the insulating assembly further includes a second insulating element disposed between the pole body and the mounting hole.

[0028] In an optional embodiment, the second insulating member includes a fourth insulating segment and a fifth insulating segment, the fourth insulating segment being disposed between the first surface of the supporting protrusion and the mounting platform, and the fifth insulating segment being disposed between the inner wall of the mounting hole and the outer wall of the pole post.

[0029] A second aspect of this utility model also provides an electronic device, a housing having a receiving cavity and an opening at one end;

[0030] The aforementioned end cap assembly, wherein the cover plate of the end cap assembly seals the opening;

[0031] And a battery cell, wherein the battery cell is disposed within the receiving cavity.

[0032] This application also provides a battery pack including the aforementioned battery.

[0033] This application also provides an electrical device including the aforementioned battery or battery pack.

[0034] The end cap assembly provided in this application effectively prevents foreign objects such as metal shavings from entering the battery by covering the cover plate gap with the extension of the insulating component, while improving sealing reliability and safety, and has the advantages of preventing short circuit risk and extending battery life.

[0035] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the batteries and electronic devices provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the end cap assembly according to an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the structure of one end of the end cap assembly according to an embodiment of this application;

[0039] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0040] Figure 4 for Figure 2 Cross-sectional view along the BB direction;

[0041] Figure 5 for Figure 2 A cross-sectional view along the CC direction;

[0042] Figure 6 for Figure 5 Enlarged structural diagram of section D in the middle;

[0043] Figure 7 This is a schematic diagram of the battery structure according to an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10-End cap assembly;

[0046] 20 - Shell;

[0047] 100-Cover plate; 100a-Mounting countersunk platform; 110-Mounting hole; 120-Pressure flange; 120a-Bent section; 120b-Main body; 121-First side; 122-Second side; 130-Notch;

[0048] 200 - electrode post; 210 - support convex ring; 220 - electrode post body; 221 - first electrode post body section; 222 - injection hole;

[0049] 300 - Insulating component; 310 - First insulating element; 311 - First insulating section; 312 - Second insulating section; 313 - Transition connection section; 314 - Third insulating section; 320 - Second insulating element; 321 - Fourth insulating section; 322 - Fifth insulating section; 330 - Extension;

[0050] D-interval. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] In existing technologies, the demand for fast charging in new energy vehicles is driving battery structures towards thinner and lighter designs, making the application of irregularly shaped terminals an important technological direction. Traditional cover plates use irregularly shaped mounting holes to fit the terminal shape, creating a structural gap (130°) at the junction of the long and short sides during stamping. This allows foreign objects such as metal debris to easily enter the battery and cause short circuits. This phenomenon is particularly pronounced under high-temperature and high-vibration conditions, becoming a key bottleneck restricting battery safety performance.

[0053] To address these issues, the R&D team discovered that machining irregularly shaped holes inevitably creates a gap of 130. However, traditional sealing solutions rely solely on flanging structures for planar sealing, which cannot effectively cover the three-dimensional space of the gap 130. By analyzing the foreign object intrusion path, they realized that a three-dimensional protective structure was needed at the gap 130. After multiple experimental verifications, they attempted to add a covering component to the edge of the sealing assembly, ultimately determining that a spatial barrier could be formed through the extension of the insulating component.

[0054] Therefore, this application proposes an end cap assembly including a cover plate, terminals, and an insulating component. The cover plate has mounting holes with different dimensions for its long and short axes and a retaining flange surrounding the holes, forming a notch 130 at the junction of the long and short sides. After the terminals pass through the mounting holes, the insulating component has an extension between the terminals and the cover plate covering the area of ​​the notch 130, effectively preventing foreign objects such as metal shavings from entering the battery, while improving sealing reliability and safety, and has the advantages of preventing short circuit risks and extending battery life.

[0055] The following is combined with Figures 1 to 7 This application describes an end cap assembly, a battery, a battery pack, and an electrical device according to embodiments of the present application. Wherein, x represents a first direction (direction along the short side of the cover plate), and y represents a second direction (direction along the long side of the cover plate).

[0056] Combination Figures 1 to 7 This application provides an end cap assembly 10 for a battery. The end cap assembly 10 includes a cover plate 100, an electrode post 200, an insulating component 300, and an extension 330 located at the outer edge of the insulating component corresponding to the notch 130.

[0057] The cover plate 100 has a recessed surface on the side facing away from the battery interior to form a mounting platform 100a. The dimension of the mounting platform 100a along the first direction (x direction in the figure) is larger than the dimension along the second direction (y direction in the figure). The first direction is perpendicular to the second direction. The mounting platform 100a has a mounting hole 110. The cover plate 100 also has a pressing flange 120 surrounding the mounting platform 100a. The pressing flange 120 includes two first side edges 121 opposite to each other along the first direction and two second side edges 122 opposite to each other along the second direction.

[0058] It is understandable that mounting hole 110 refers to a through hole adapted to the shape of irregular pole post, used to match the cross-sectional shape of pole post 200.

[0059] Specifically, the design of the long and short shafts of the mounting hole 110 ensures the stable fixation of the pole post 200 while allowing for necessary assembly tolerances.

[0060] Compared to existing technologies, traditional solutions rely solely on planar compression sealing of the flanged structure, which cannot address the three-dimensional gap 130 space. This solution, through the spatial coverage design of the extension 330, effectively seals the three-dimensional channel formed by the gap 130.

[0061] It is understood that the mounting platform 100a is a structure formed by a recess on the surface of the cover plate 100 facing away from the inside of the battery. Optionally, the mounting platform 100a can be formed by stamping or casting. The dimensions of the mounting platform 100a are larger in the first direction than in the second direction to form an irregular structure that can accommodate the installation requirements of the irregularly shaped pole post 200.

[0062] Optionally, the mounting platform 100a can be rectangular, elliptical, oblong, etc.

[0063] In addition, the pressing flange 120 ensures the sealing effect of the main body area of ​​the insulating component 300 through circumferential pressing, but the notch 130 forms a leakage channel due to structural discontinuity. The pressing flange 120 is a folded edge surrounding the mounting platform 100a. Optionally, the pressing flange 120 can be formed by stamping or welding. The pressing flange 120 includes two first sides 121 opposite to each other in a first direction and two second sides 122 opposite to each other in a second direction. The first side 121 and the second side 122 both have a bent portion 120a, which can press against the insulating component 300 to achieve the fixing effect of the pole post 200 and the insulating component 300.

[0064] The pole post 200 passes through the mounting hole 110 and includes a supporting protrusion ring 210, which is supported on the mounting platform 100a. Specifically, the supporting protrusion ring 210 is an annular protrusion structure provided on the pole post 200. Optionally, the supporting protrusion ring 210 can be formed by turning or forging processes to support the surface of the mounting platform 100a, providing axial positioning and support for the pole post 200 and ensuring the stability of the pole post 200.

[0065] An insulating component 300 is disposed between the pole post 200 and the cover plate 100. The insulating component 300 wraps around the edge of the supporting protrusion ring 210. The pressing flange 120 has a bent portion 120a, which presses against the insulating component 300 and is located on the side of the supporting protrusion ring 210 opposite to the mounting platform 100a.

[0066] Optionally, the insulating component 300 may be formed using injection molding or overmolding processes.

[0067] The insulating component 300 is used to isolate the conductive contact between the pole post 200 and the cover plate 100, and also ensures sealing and insulation stability by being pressed against by the bent portion 120a.

[0068] This application further proposes that the extension 330 extends outward along the space of the notch 130 to form a three-dimensional barrier covering at least a portion of the notch 130. After the pole post 200 is inserted, the extension 330 fills the gap formed by the notch 130, blocking the intrusion path of foreign objects. The inner edge of the insulating component 300 is in close contact with the outer peripheral wall of the pole post 200 to form a first seal, and the extension 330 cooperates with the area of ​​the notch 130 to form a second layer of protection.

[0069] The extension 330 abuts against the inner edge of the notch 130, and there is a gap D between the extension 330 and the inner edge of the notch 130 along the second direction. The gap D is greater than or equal to 0.1 mm and less than or equal to 3 mm. For example, the gap D can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm or 3 mm, etc. The embodiments of this application are not limited to this, nor are they limited to the above examples.

[0070] The dimension L of the extension 330 along the first direction is greater than or equal to 0.4 mm and less than or equal to 3 mm. For example, the dimension L can be 0.4 mm, 0.5 mm, 1 mm, 1.5 mm or 3 mm, etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0071] The insulating component 300 and the extension 330 are integrally molded. The extension is made of a gel with a thermal conductivity greater than or equal to 0.1 W / (mK) and less than or equal to 1.5 W / (mK). For example, the thermal conductivity of the extension can be 0.1 W / (mK), 0.5 W / (mK), 1 W / (mK), 1.3 W / (mK), or 1.5 W / (mK), etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0072] Wherein, the interval D refers to the gap between the extension 330 along the second direction and the inner edge of the notch 130, which can be achieved by reserving assembly tolerance allowance to avoid structural interference caused by thermal expansion or assembly errors. Wherein, the dimension L of the extension 330 refers to the length covering the area of ​​the notch 130 along the first direction, which can be controlled by the molding process to ensure effective sealing of the notch 130.

[0073] The integrated molding setting refers to the extension 330 and the insulating component 300 forming an integral structure through synchronous injection molding. Specifically, a two-color injection molding process can be used to improve the structural bonding strength.

[0074] Among them, colloidal material refers to polymer material with insulating properties, specifically silicone or epoxy resin, and thermal conductivity is adjusted by adding thermally conductive fillers to achieve both insulation protection and heat conduction.

[0075] Specifically, the extension 330 extends along the first direction to the notch 130 area and contacts the inner edge of the notch 130, forming a physical barrier layer to prevent external foreign objects from entering the battery through the notch 130. The interval D set along the second direction provides tolerance compensation space for the assembly process, avoiding the deformation of the extension 330 due to the thermal expansion difference between the terminal and the cover plate. The insulating component 300 and the extension 330 form a continuous closed structure through an integral molding process, eliminating the risk of glue leakage at the joint of the traditional split seal at the notch 130. The adhesive material, while meeting the insulation performance requirements, optimizes the thermal conductivity to quickly conduct heat from the terminal 200 area to the cover plate 100, reducing the impact of local temperature rise on the sealing stability.

[0076] Compared to existing technologies, traditional solutions lack an extended covering structure at the notch 130, relying solely on the flange itself for sealing, making notch 130 a weak point for foreign object intrusion. Existing insulation components 300 often employ a split design, resulting in assembly gaps in the notch 130 area and neglecting heat dissipation requirements. This solution, through contact sealing between the extension 330 and the inner edge of the notch 130, the provision of a gap D space, and the application of thermally conductive adhesive materials, solves the sealing problem while achieving comprehensive optimization of structural reliability and thermal management.

[0077] Through the above technical solutions, this application effectively prevents foreign objects such as metal debris from entering the battery through the flanged notch 130, improving the sealing reliability of the insulating component 300 in the mounting area of ​​the irregularly shaped terminal 200. The integrally molded extension 330 avoids assembly errors of split seals, ensuring the structural integrity of the notch 130 area. The optimized thermal conductivity of the colloidal material balances the heat distribution during terminal operation, reducing the risk of material aging due to localized overheating, thereby extending battery life.

[0078] This application further proposes to dope metal particles in a colloid, wherein the metal particles are uniformly distributed in the colloid.

[0079] In this context, doping the colloid with metal particles refers to dispersing highly thermally conductive metal materials in particulate form within the colloidal substrate. This can be achieved by mixing metal powders such as aluminum, copper, or silver with the colloid, with the particle size controlled within the micrometer or nanometer range. Uniform particle distribution means that the particles are distributed in a non-aggregated state within the colloidal substrate. This can be achieved through mechanical stirring, ultrasonic dispersion, or the addition of dispersants. Uniform distribution ensures that the metal particles form a continuous thermal conduction path without compromising the colloid's insulating properties due to localized aggregation.

[0080] Specifically, by introducing metal particles into the colloidal substrate, the contact between the particles forms a thermally conductive network, allowing heat to be conducted to the external environment along the metal particle network when the extension 330 covers the notch 130. The uniformly distributed metal particles improve thermal conductivity while preventing the localized decrease in the colloid's insulation performance caused by particle aggregation. For example, during colloid injection molding, the metal particles flow with the colloid, forming a randomly dispersed state, and after curing, they form an isotropic thermally conductive structure. This structure forms a uniform heat dissipation interface at the notch 130, eliminating localized heat accumulation caused by insufficient thermal conductivity of the colloid, while maintaining the overall insulating barrier function of the extension 330.

[0081] Compared to existing technologies, traditional solutions use only pure colloid as the material for the extension 330, whose thermal conductivity is limited by the low thermal conductivity of the colloid itself, making it unable to effectively conduct heat from the notch 130. This application, however, by doping the colloid with uniformly distributed metal particles, enables the extension 330 to possess both insulation and thermal conductivity, solving the heat dissipation problem caused by structural discontinuities at the notch 130 of the irregularly shaped pole 200, while also avoiding the risk of insulation failure caused by uneven distribution of metal particles.

[0082] Through the above technical solution, this application achieves efficient heat dissipation of the extension 330 when covering the gap 130, preventing excessive local temperature from causing colloid aging or seal failure, while ensuring that the insulation performance of the extension 330 meets battery safety requirements. The uniform distribution of metal particles ensures even heat conduction along all positions of the extension 330, avoiding the formation of hot spots, thereby improving the battery's operational stability under fast charging conditions.

[0083] It is understandable that if the pressing flange 120 undergoes plastic deformation under thermal stress, causing partial peeling between the pressing flange 120 and the insulating component 300, the extension 330 can still maintain contact strength, thereby ensuring the pressing stability of the pressing flange 120.

[0084] Specifically, during the manufacturing process of the end cap assembly 10, the first side 121 and the second side 122 of the pressing flange 120 can be formed by stamping and extruding material through the cover plate 100. Then, the insulating component 300 is placed on the cover plate, and the pole post 200 is placed on the mounting platform 100a and inserted into the mounting hole 110 to ensure that the insulating component 300 and the pole post 200 are in contact. Then, the pressing flange 120 is stamped so that the bent portion 120a presses against the insulating component 300. At this time, the pressing force of the bent portion 120a limits the pole post 200. Then, the extension portion 330 is covered on at least part of the surface of the bent portion 120a and the insulating component 300 through hot pressing or bonding process to further limit the pole post 200.

[0085] In some embodiments, combined with Figure 2 , Figure 3 and Figure 5 The pressing flange 120 also includes a body portion 120b, the first end of which is connected to the cover plate 100, the second end of which extends along the thickness direction of the cover plate 100, and the curved portion 120a is perpendicular to the body portion 120b.

[0086] The main body 120b forms a rigid support base through the connection between the first end and the cover plate 100. The extension of the second end along the thickness direction increases the bending stiffness of the main body 120b. In addition, the vertical arrangement of the bending part 120a and the main body 120b enables it to convert the supporting force of the main body 120b into a counterforce perpendicular to the axis of the pole post 200, ensuring the counterforce effect of the counterforce flange 120 on the pole post 200.

[0087] Optionally, the connection between the body 120b and the cover plate 100 can be welding or integral stamping.

[0088] Optionally, the connection end between the body 120b and the cover plate 100 is designed with a rounded transition to reduce stress concentration and further improve structural reliability.

[0089] Understandably, in some examples, the pressing flange 120 can be formed by stretching the cover plate 100, wherein the bent portion 120a can be bent under the action of external force after the pole post 200 and the insulating component 300 are installed, so as to achieve perpendicularity with the body portion 120b, at which time the bent portion 120a presses against the insulating component 300.

[0090] Thus, the design of the body portion 120b and the bent portion 120a of the pressing flange 120 ensures the overall strength of the pressing flange 120, improves the fixing effect on the terminal post 200 and the sealing assembly, improves the stability and sealing of the terminal post 200, and helps to ensure the performance of the battery's electrical properties.

[0091] In some embodiments, combined with Figure 3 The support ring 210 includes a first surface facing the mounting platform 100a along the thickness direction of the cover plate 100 and a second surface facing the curved portion 120a.

[0092] The insulation assembly 300 includes a first insulating member 310, which includes a first insulating segment 311, a second insulating segment 312, and a transition connecting segment 313. The first insulating segment 311 is disposed between the first surface of the supporting protrusion ring 210 and the mounting platform 100a. The second insulating segment 312 is sandwiched between the second surface of the supporting protrusion ring 210 and the bent portion 120a. The transition connecting segment 313 is disposed between the peripheral wall of the supporting protrusion ring 210 and the body portion 120b, and its two ends are respectively connected to the first insulating segment 311 and the second insulating segment 312.

[0093] Optionally, the first insulating element 310 may be made of insulating plastic.

[0094] Optionally, the transition connection section 313 is made of an elastic insulator, which deforms under pressure to fill the irregular gap between the peripheral wall of the supporting protrusion ring 210 and the body part 120b.

[0095] The first insulating segment 311 covers the contact area between the first surface of the supporting protrusion ring 210 and the mounting platform 100a, the second insulating segment 312 fills the space between the second surface of the supporting protrusion ring 210 and the bent portion 120a, and the transition connecting segment 313 extends along the peripheral wall of the supporting protrusion ring 210 and connects the first insulating segment 311 and the second insulating segment 312.

[0096] Thus, the first insulating section 311, the transition connection section 313, and the second insulating section 312 form a three-dimensional sealing structure surrounding the edge of the supporting convex ring 210, so that the supporting convex ring 210 and the cover plate 100 are isolated by insulating material in the thickness direction, radial direction, and circumferential direction, preventing electrolyte leakage or short circuit between metal parts, and improving the safety of the battery.

[0097] In some embodiments, combined with Figure 3 The terminal post 200 also includes a terminal post body 220, which passes through the mounting hole 110. A supporting protrusion ring 210 is disposed on the peripheral wall of the terminal post body 220. The terminal post body 220 includes a first terminal post body portion 221 located on the side of the supporting protrusion ring 210 facing away from the inside of the battery. The first terminal post body portion 221 is opposite to the end face of the bent portion 120a and spaced apart by D. The first insulating member 310 also includes a third insulating section 314, which is connected to the end of the second insulating section 312 away from the transition connection section 313. The third insulating section 314 also covers the outer peripheral surface of the first terminal post body portion 221.

[0098] The electrode body 220 penetrates the cover plate 100 through the mounting hole 110. The supporting ring 210 is arranged along the peripheral wall of the electrode body 220 and supported on the mounting platform 100a. The first electrode body portion 221 is located outside the supporting ring 210 and is spaced D from the bent portion 120a. The third insulating section 314 extends to cover the outer peripheral surface of the first electrode body portion 221, forming a continuous insulating layer, while maintaining the gap between the first electrode body portion 221 and the end face of the bent portion 120a.

[0099] Specifically, the first pole body portion 221 of the pole body 220 extends outside the supporting protrusion ring 210, and its outer peripheral surface is completely covered by the third insulating section 314, which can prevent direct contact with the pressing flange 120 or external components. The third insulating section 314 is connected to the second insulating section 312, forming a continuous insulating path from the second surface of the supporting protrusion ring 210 to the first pole body portion 221. The gap D between the first pole body portion 221 and the end face of the bent portion 120a is sealed and isolated by the wrapping structure of the third insulating section 314.

[0100] Thus, by adding a third insulating section 314 to the outer peripheral surface of the first pole body 221, the insulation effect between the pole 200 and the cover plate 100 is further enhanced. The connection structure between the third insulating section 314 and the second insulating section 312 enhances the overall integrity of the insulation assembly 300 and improves the reliability of the insulation assembly 300.

[0101] The third insulating section 314 also prevents short circuits between the terminal 200 and the cover plate 100, improving battery safety. Furthermore, the presence of the third insulating section 314 reduces the gap between the terminal 200 and the cover plate 100, contributing to improved battery sealing performance.

[0102] In some embodiments, combined with Figure 3 The end of the first electrode body 221 facing away from the battery protrudes from the third insulating section 314. This design avoids gaps that might form due to the first electrode body 221 being flush with or recessed from the third insulating section 314, further ensuring the sealing strength of the insulation assembly 300. Furthermore, the protrusion of the first electrode body 221 from the third insulating section 314 also facilitates connection to external wires.

[0103] In some embodiments, the electrode post body 220 is provided with an electrolyte injection hole 222 communicating with the inside of the battery. The electrolyte injection hole 222 integrated into the electrode post body 220 refers to a through-hole structure penetrating the axis of the electrode post, specifically formed by drilling. The hole diameter can be 1mm-5mm, ensuring that the electrolyte injection path coincides with the mounting axis of the electrode post 200. Exemplarily, the hole diameter can be 1mm, 2mm, 3mm, 4mm, or 5mm, etc., but this application embodiment does not limit this, nor is it limited to the above examples.

[0104] The injection port 222 axially penetrates the electrode body 220. For example, a one-way valve structure can be installed at the top of the electrode 200, and the port can be sealed by laser welding after electrolyte injection. The integrated design of the injection port 222 allows the electrolyte injection process to proceed without damaging the main structure of the cover plate 100, maintaining the integrity of the sealing system. In the prior art, the injection function is often independently located in other areas of the cover plate 100. This solution integrates the injection function into the electrode body 220, eliminating the structural strength loss caused by additional openings.

[0105] In some embodiments, not shown in the figures, the third insulating segment 314 is spaced D apart from the end face of the bend 120a to form a sealing gap.

[0106] Optionally, the gap filler is made of an elastic material that deforms to fill the gap when the sealing gap is under pressure.

[0107] It is understandable that the gap filling part can achieve the sealing of the sealing gap by covering the sealing gap. Specifically, a sealing gap is formed between the third insulating section 314 and the end face of the bent part 120a. The gap filling part can be injected into the sealing gap and formed to ensure the sealing effect.

[0108] In some embodiments, not shown in the figures, the first side 121 has notches 130 at both ends along the second direction, the notches 130 separate the first side 121 and the second side 122, and the extension 330 covers the notches 130.

[0109] Optionally, the notch 130 can be formed by cutting at both ends of the first side 121 in a second direction, thereby disconnecting the first side 121 from the second side 122. Optionally, the extension 330 covers the notch 130 and is adapted to the shape of the notch 130.

[0110] The notch 130 of the first side 121 disconnects its connection with the second side 122, allowing the first side 121 and the second side 122 to deform independently, reducing the risk of stress concentration that may occur when the bent portion 120a of the first side 121 and the second side 122 is formed. When the extension portion 330 is formed, it can cover the notch 130, fill the space at the notch 130, and enhance the overall structural strength of the flange.

[0111] In some embodiments, combined with Figure 3 The insulating component 300 includes a second insulating member 320, which includes a fourth insulating section 321 and a fifth insulating section 322. The fourth insulating section 321 is disposed between the first surface of the supporting protrusion ring 210 and the mounting platform 100a, and the fifth insulating section 322 is disposed between the inner wall of the mounting hole 110 and the outer wall of the pole post 200.

[0112] Optionally, the second insulating element 320 may be made of insulating plastic.

[0113] Optionally, the fourth insulating segment 321 and the fifth insulating segment 322 can be manufactured using an integral injection molding process to ensure continuity between the two insulating segments.

[0114] The fourth insulating section 321 covers the contact area between the first surface of the supporting protrusion 210 and the mounting platform 100a, blocking the conductive path between the supporting protrusion 210 and the cover plate 100. In addition, the fourth insulating section 321 can also generate a pre-tightening force through compression deformation, enhancing the sealing effect between the supporting protrusion 210 and the cover plate 100.

[0115] The fifth insulating segment 322 extends along the inner wall of the mounting hole 110 and fills the gap between the mounting hole 110 and the pole post 200, isolating the direct contact between the outer wall of the pole post 200 and the cover plate 100. In addition, the fifth insulating segment 322 wraps around the outer wall of the pole post 200 and fits the inner wall of the mounting hole 110. When the pole post 200 is subjected to force, it buffers the vibration impact through elastic deformation, and at the same time compensates for the dimensional changes caused by thermal expansion.

[0116] As can be seen, the fourth insulating section 321 and the fifth insulating section 322 together form a continuous insulating barrier, blocking all possible conductive channels between the pole post 200 and the cover plate 100, avoiding the risk of short circuit caused by electrolyte leakage, and improving the pressure resistance and sealing reliability of the end cover assembly 10.

[0117] In some embodiments, the pressing flange 120 is integrally formed with the cover plate 100.

[0118] Optionally, the counter-pressing and flanging 120 can be formed by counter-pressing, flanging and bending using multi-station molds.

[0119] Understandably, the one-piece molding design of the pressure flange 120 and the cover plate 100 results in no connection interface between the two, high overall rigidity, good sealing performance, and the design can be stamped, resulting in high production efficiency and suitability for mass automated production.

[0120] In some embodiments, the pressing flange 120 is welded to the cover plate 100.

[0121] Optionally, the anti-flanged flange 120 and the cover plate 100 can be connected by fiber laser welding.

[0122] Understandably, this welding connection design can achieve the connection between complex flange structures and cover plate 100, such as local thickening, multi-segment flanges, etc., and is suitable for customized production.

[0123] In some embodiments, combined with Figures 3 to 5 The end of the terminal post 200 facing the inside of the battery protrudes from the side surface of the cover plate 100 facing the inside of the battery.

[0124] Understandably, the end of the terminal 200 facing the inside of the battery can be used to weld or press the internal busbar, wire terminals, or cell tabs of the battery to achieve power conduction.

[0125] In this design, after the terminal post 200 passes through the mounting hole 110, the end of the terminal post 200 facing the inside of the battery extends beyond the inner surface of the cover plate 100, so that the end of the terminal post 200 facing the inside of the battery protrudes directly into the internal space of the battery, which facilitates direct contact with the conductive components inside the battery. This avoids the situation in traditional designs where the terminal post 200 is flush with the cover plate 100, which requires additional wire extension, thereby reducing contact resistance and energy loss.

[0126] In some embodiments, not shown in the figures, the end cap assembly 10 further includes an electrode adapter disposed on the side of the cover plate 100 facing the inside of the battery and connected to the terminal post 200. The electrode adapter is used to connect the terminal post 200 and the battery cell.

[0127] Understandably, the electrode adapter can serve as an electrical connection bridge between the terminal 200 and the battery cell inside the battery, for conducting charging or discharging current.

[0128] Specifically, in some situations, when the interface form of the electrode post 200 and the battery cell does not match, such as when the electrode post 200 is a circular cylindrical shape while the battery cell tab is a sheet shape, the shape can be converted using an adapter. In addition, the electrode adapter can also be used to adjust the direction of the conductive path, such as changing the vertical conductivity of the electrode post 200 to horizontal conductivity, to adapt to the internal layout of the battery.

[0129] In some embodiments, not shown in the figures, the end cap assembly 10 further includes an insulating plate disposed on the side of the cover plate 100 facing the inside of the battery to separate the cover plate 100 from the battery cell.

[0130] Understandably, the insulating plate can be used to achieve electrical isolation between the cover plate 100 and the battery cell, block leakage current between the battery cell and the metal cover plate 100, and ensure electrical safety. In addition, the insulating plate can also delay the transmission of flame or high temperature to the cover plate 100 during thermal runaway, thereby improving the overall stability of the battery.

[0131] This application also provides a battery, which may be a lithium-ion battery, a sodium-ion battery, or other types of batteries.

[0132] Combination Figure 7 The battery includes a housing 20, a battery cell, and an end cap assembly 10 as described in the above embodiments. The housing 20 has a receiving cavity, and one section of the housing 20 has an opening. The cover plate 100 of the end cap assembly 10 is used to seal the opening, and the battery cell is disposed in the receiving cavity.

[0133] Optionally, the battery can be a prismatic battery, and accordingly, the cross-section of the casing 20 is square, and the cover plate 100 is also square; or, the battery can be a cylindrical battery, and accordingly, the cross-section of the casing 20 is circular, and the cover plate 100 is also circular.

[0134] The housing 20 provides installation space for the battery cell through a receiving cavity, and the opening facilitates the assembly of the end cap assembly 10 with the housing 20. The cover plate 100 seals the opening to form a closed structure to isolate the external environment. The battery cell is located in the receiving cavity and the electrode is connected through the end cap assembly 10. The structural design of the end cap assembly 10 ensures the stability of the electrode post 200 and avoids sealing failure that may be caused by insufficient strength of the flange structure.

[0135] The battery provided in this application embodiment optimizes the structural strength in the first direction when the terminal post 200 is installed on the cover plate 100 by designing the end cap assembly 10. This improves the stability and sealing of the connection between the terminal post 200 and the cover plate 100, ensures heat dissipation, avoids the plastic deformation that may occur in the long side area due to thermal stress in the traditional flanged structure, reduces the risk of electrolyte penetration, lowers the probability of internal micro-short circuits, and improves the overall structural stability and service life of the battery.

[0136] This application also provides a battery pack, which may include the battery in the above embodiments.

[0137] The battery pack provided in this application embodiment, through the design of the battery described above, ensures the overall structural stability and sealing performance, and guarantees its service life.

[0138] This application also provides an electrical device, which can be a new energy vehicle, electric bicycle, electric train, aircraft, energy storage cabinet, mobile phone, smart home device, drone, medical device, etc. This electrical device may include the battery or battery pack described in the above embodiments.

[0139] The electrical equipment provided in this application, through the design of the aforementioned battery or battery pack, ensures power stability and helps improve user satisfaction.

[0140] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0141] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0142] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0143] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An end cap assembly for a battery, characterized in that, include: A cover plate (100) is provided with a mounting hole (110). The size of the mounting hole (110) along the first direction is larger than the size along the second direction. The first direction and the second direction are perpendicular to each other. The cover plate (100) is also provided with a pressing flange (120) surrounding the mounting hole (110). The pressing flange (120) includes two first side edges (121) opposite to each other along the first direction and two second side edges (122) opposite to each other along the second direction. A notch is formed at the junction of the first side edges (121) and the second side edges (122). A pole post (200) is inserted through the mounting hole (110); The insulating component (300) is disposed between the pole post (200) and the cover plate (100). The inner edge of the insulating component (300) abuts against the outer peripheral wall of the pole post (200). An extension (330) is provided at the position corresponding to the notch on the outer edge of the insulating component (300), and the extension (330) covers at least part of the notch.

2. The end cap assembly according to claim 1, characterized in that, The extension (330) abuts against the inner edge of the notch.

3. The end cap assembly according to claim 1, characterized in that, Along the second direction, there is a gap D between the side edge of the extension (330) facing the notch (130) and the side edge of the notch (130) facing the extension (330); The interval D is greater than or equal to 0.1 mm and less than or equal to 3 mm.

4. The end cap assembly according to claim 1, characterized in that, Along the first direction, the dimension L of the extension (330) is greater than or equal to 0.4 mm and less than or equal to 3 mm.

5. The end cap assembly according to any one of claims 1-4, characterized in that, The insulating component (300) and the extension (330) are integrally formed.

6. The end cap assembly according to any one of claims 1-4, characterized in that, The extension (330) is made of a colloid.

7. The end cap assembly according to claim 6, characterized in that, The thermal conductivity of the colloid is greater than or equal to 0.1 W / (mK) and less than or equal to 1.5 W / (mK).

8. The end cap assembly according to claim 6, characterized in that, The colloid also contains metal particles, which are uniformly distributed within the colloid.

9. The end cap assembly according to any one of claims 1-4, characterized in that, The cover plate (100) has a recessed side surface facing away from the inside of the battery to form a mounting platform (100a). The mounting platform (100a) has a larger dimension along the first direction than along the second direction. The mounting hole (110) is provided on the mounting platform (100a), and the pressing flange (120) is provided around the mounting platform (100a).

10. The end cap assembly according to claim 9, characterized in that, The pole post (200) includes a pole post body (220) and a support protrusion ring (210) disposed on the outer peripheral wall of the pole post body (220). The support protrusion ring (210) is supported on the mounting platform (100a), and the insulating component (300) wraps around the outer edge of the support protrusion ring (210).

11. The end cap assembly according to claim 10, characterized in that, The electrode body (220) is provided with a liquid injection hole (222), which is connected to the inside of the battery so as to inject electrolyte into the inside of the battery through the liquid injection hole (222).

12. The end cap assembly according to claim 10, characterized in that, The pressing flange (120) includes a bent portion (120a); the bent portion (120a) presses against the insulating component (300) and is located on the side of the supporting protrusion (210) facing away from the mounting platform (100a).

13. The end cap assembly according to claim 12, characterized in that, The pressing flange (120) also includes a body part (120b); the first end of the body part (120b) is connected to the cover plate (100), and the second end of the body part (120b) extends along the thickness direction of the cover plate (100) and is connected to the curved part (120a), and the curved part (120a) is perpendicular to the body part (120b).

14. The end cap assembly according to claim 12, characterized in that, The insulating assembly (300) includes a first insulating member (310) disposed between the supporting protrusion (210) and the pressing flange (120).

15. The end cap assembly according to claim 14, characterized in that, The supporting protrusion (210) includes a first surface facing the mounting countersunk platform (100a) along the thickness direction of the cover plate (100) and a second surface facing the pressing flange (120); The inner edge of the first insulating member (310) abuts against the second surface of the supporting protrusion (210), and the extension (330) is provided at the position corresponding to the notch on the outer edge of the first insulating member (310).

16. The end cap assembly according to claim 15, characterized in that, The first insulating member (310) includes a first insulating section (311), a second insulating section (312), and a transition connecting section (313) connected together. The first insulating section (311) is disposed between the first surface and the mounting platform (100a). The second insulating section is sandwiched between the second surface and the bent portion (120a). The transition connecting section (313) is disposed between the peripheral wall of the supporting protrusion ring (210) and the body portion (120b). The two ends of the transition connecting section (313) are respectively connected to the first insulating section (311) and the second insulating section.

17. The end cap assembly according to any one of claims 14-16, characterized in that, The insulating assembly (300) further includes a second insulating element (320) disposed between the pole body (220) and the mounting hole (110).

18. The end cap assembly according to claim 17, characterized in that, The second insulating member (320) includes a fourth insulating section (321) and a fifth insulating section (322). The fourth insulating section (321) is disposed between the first surface of the supporting protrusion (210) and the mounting platform (100a), and the fifth insulating section (322) is disposed between the inner wall of the mounting hole (110) and the outer wall of the pole post (200).

19. A battery, characterized in that, include: A housing (20) having a receiving cavity and an opening at one end; The end cap assembly (10) according to any one of claims 1-18, wherein the cover plate (100) of the end cap assembly (10) covers the opening; And a battery cell, wherein the battery cell is disposed within the receiving cavity.

20. A battery pack, characterized in that, include: The battery of claim 19.

21. An electrical appliance, characterized in that, include: The battery of claim 19, or the battery pack of claim 20.

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