End cover assembly, battery monomer, battery and electric device

Abstract

The utility model relates to an end cover assembly, a battery monomer, a battery and a power utilization device, and the end cover assembly comprises a cover plate which is provided with a mounting hole; the lower insulating plate is attached to the bottom surface of the cover plate in the thickness direction; a via hole communicated with the mounting hole is formed in the lower insulating plate; the pole column is arranged in the mounting hole and the via hole in a penetrating manner; the sealing ring comprises a first skirt edge and a ring body, and the ring body is nested in the mounting hole; and the first skirt edge is arranged at one end of the ring body and is clamped between the lower insulating plate and the bottom surface of the cover plate. The end cover assembly, the battery monomer, the battery and the power utilization device provided by the embodiment of the utility model have the advantage of good power utilization safety.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an end cover assembly, a battery cell, a battery and an electrical device. Background Art

[0002] With the development of new energy, more and more fields are using new energy as power. Due to its advantages of high energy density, rechargeable, safe and environmentally friendly, power batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] However, in actual application of the battery, there will be electrical connection between the cover and the pole, which affects the safety of use. Summary of the invention

[0004] Based on this, it is necessary to provide an end cover assembly, a battery cell, a battery and an electrical device to address the issue of electrical safety.

[0005] The first aspect of the present application provides an end cover assembly, comprising: a cover plate, formed with a mounting hole; a lower insulating plate, attached to the bottom surface of the cover plate along the thickness direction; the lower insulating plate is formed with a through hole connected to the mounting hole; a pole, passing through the mounting hole and the through hole; and a sealing ring, comprising a first skirt and a ring body, the ring body being nested in the mounting hole; the first skirt is arranged at one end of the ring body, and is clamped between the lower insulating plate and the bottom surface of the cover plate.

[0006] By arranging a first skirt on the sealing ring, the first skirt extends outward radially along the mounting hole, and the first skirt is clamped between the lower insulating plate and the bottom surface of the cover plate; when creepage occurs, the current first needs to flow horizontally in the radial direction to bypass the first skirt of the sealing ring, and then reach the ground of the cover plate along the vertical gap, thereby effectively increasing the creepage distance between the bottom end of the pole through the adapter plate to the cover plate. When the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoke and fire can be effectively avoided, thereby effectively improving safety risks.

[0007] In one embodiment, the lower insulating plate includes a wrapping portion, which is circumferentially arranged around the edge of the through hole, and the wrapping portion is configured to wrap at least a portion of the ring body. The insulating wrapping portion further covers the entrance of the gap between the first skirt of the sealing ring and the lower insulating plate. When creepage occurs, the current first needs to climb axially upward over the wrapping portion, then axially downward through the gap between the wrapping portion and the ring body, and then flow horizontally radially, bypassing the first skirt of the sealing ring, and finally reaching the ground of the cover plate along the vertical gap, effectively increasing the creepage distance between the bottom end of the pole and the cover plate. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoke and fire, and effectively improve safety risks.

[0008] In one embodiment, along the thickness direction of the cover plate, the wrapping portion extends upward to the top of the ring body, and the top of the ring body is the end away from the first skirt. In this way, the creepage distance between the bottom end of the pole and the cover plate is maximized, and when the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoke and fire can be effectively avoided, effectively improving safety risks.

[0009] In one embodiment, the lower insulating plate includes a first annular groove surrounding the via hole, and the first skirt is embedded in the first annular groove. In this way, the contact area between the first skirt and the first annular groove is large, thereby ensuring that the gap between the sealing ring and the lower insulating plate is small enough, and it is difficult for the electrolyte to enter the gap, thereby ensuring the sealing effect.

[0010] In one embodiment, the first skirt extends radially outwardly along the mounting hole to form a circular ring shape; and / or the first skirt is made of rubber or plastic.

[0011] In one embodiment, the sealing ring includes a second skirt, which is arranged at one end of the ring body away from the first skirt and is sandwiched between the pole and the top surface of the cover. The upper surface of the second skirt abuts against the bottom end surface of the pole, and the lower surface of the second skirt abuts against the top surface of the cover, thereby isolating the pole and the cover, preventing the two from bypassing the second skirt and being energized, which can effectively avoid leakage and effectively improve safety risks.

[0012] In one embodiment, the first skirt and the second skirt are both in annular shape, and the radius of the first skirt is greater than the radius of the second skirt. In this way, it can be ensured that the electrolyte is difficult to enter the gap between the first skirt and the lower insulating plate, and the creepage distance between the bottom of the pole through the adapter plate and the cover plate is further extended. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoke and fire, and effectively improve safety risks.

[0013] In one embodiment, a mounting groove is formed inwardly on a side of the second skirt facing the first skirt, and the cover plate includes a raised portion; the raised portion is engaged with the mounting groove, so that the positioning and mounting of the cover plate and the sealing ring are facilitated.

[0014] In one embodiment, the end cap assembly includes an adapter plate, which is installed on the side of the lower insulating plate away from the cover plate; along the thickness direction of the cover plate, part of the adapter plate conflicts with the bottom end of the pole. In this way, when creepage occurs, the current of the adapter plate first needs to flow horizontally in the radial direction to bypass the first skirt of the sealing ring, and then reach the ground of the cover plate along the vertical gap, which effectively increases the creepage distance between the bottom end of the pole through the adapter plate to the cover plate. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoke and fire, and effectively improve safety risks.

[0015] In one embodiment, the end cap assembly includes an upper insulating portion, which is disposed on a side of the cover plate away from the lower insulating plate, and the upper insulating portion is sleeved around the pole to isolate the pole from the cover plate. In this way, the insulating portion can isolate the electrical connection between the top of the pole and the top surface of the cover plate.

[0016] A second aspect of the present application provides a battery cell, comprising the above-mentioned end cover assembly.

[0017] A third aspect of the present application provides a battery, comprising the above-mentioned battery cell.

[0018] A fourth aspect of the present application provides an electrical device, comprising the above-mentioned battery, wherein the battery is used to provide electrical energy.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0021] Figure 2 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0022] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0023] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0024] Figure 5 An exploded view of an end cap assembly provided for some embodiments of the present application.

[0025] Figure 6 A cross-sectional view of an end cap assembly provided for some embodiments of the present application.

[0026] Figure 7 for Figure 6 An embodiment of a partial enlarged view of C of the structure shown.

[0027] Figure 8 for Figure 6 Another embodiment of the enlarged view of the C part of the structure shown.

[0028] Fig. 9 for Figure 6 Another embodiment of the enlarged view of the C part of the structure shown.

[0029] Fig.10 A half-section view of a sealing ring provided in some embodiments of the present application.

[0030] Description of reference numerals:

[0031] Vehicle-1000, battery-100, box-110, first part-111, second part-112, battery module-120, battery cell-121, controller-200, motor-300, cover-10, mounting hole-11, top surface-12, bottom surface-13, protrusion-14, second ring groove-15, pole-20, lower insulating plate-30, wrapping part-31, through hole-32, first ring groove-33, sealing ring-40, first skirt-41, second skirt-42, ring body-43, mounting groove-45, adapter plate-50, upper insulating part-60. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, if the technical terms "first", "second", etc. appear, these terms are only used for descriptive purposes to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise clearly and specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" refers to more than two groups (including two groups), and if the term "multiple sheets" appears, "multiple sheets" refers to more than two sheets (including two sheets).

[0038] In the description of the embodiments of the present application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if the technical terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0042] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0043] In the related art, as the battery is used, the internal parts of the battery cell change due to squeezing, charging and discharging, etc., and the electrolyte penetrates into the gap between the sealing ring, the cover plate and the pole under the action of internal pressure along the gap between the lower insulating plate and the sealing ring. When the insulation between the battery cell and the battery pack body fails, the current can directly reach the pole after passing through the gap between the sealing ring and the lower insulating plate. The creepage distance is often short, which makes it more likely to cause creepage, leading to leakage. Then, the high voltage between the pole and the cover plate will cause the electrolyte to ionize, smoke and catch fire, posing a greater safety risk.

[0044] In order to alleviate the problem of unsafe electricity use, a sealing ring can be used to increase the insulation distance between the lower insulating plate and the cover plate, so that the current when creepage occurs needs to bypass the sealing ring structure, effectively increasing the creepage distance between the bottom of the pole and the cover plate. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoking and fire, and the safety risk is small.

[0045] The embodiments of the present application provide an end cap assembly, a battery cell, a battery, and an electric device, which may be, but not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0046] It should be understood that the technical solutions generally described in the embodiments of the present application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including a box and electrical devices using batteries. However, for the sake of simplicity of description, an electrical device in an embodiment of the present application is taken as an example of vehicle 1000.

[0047] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0048] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0049] In order to meet different power requirements, the battery 100 may include a plurality of battery cells, and a battery cell refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery 100 mentioned in the present application includes a battery module or a battery pack. Among them, a plurality of battery cells 121 can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. The battery 100 may also be referred to as a battery pack. In the embodiment of the present application, a plurality of battery cells 121 may directly constitute a battery pack, or may first constitute a battery module, and the battery module may then constitute a battery pack.

[0050] Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of the battery module provided in some embodiments of the present application. Figure 2 and Figure 3 The battery 100 may include a plurality of battery cells 121 and a housing 110 , wherein the housing 110 is used to accommodate the battery cells 121 or the battery module 120 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 121 .

[0051] The box 110 can adopt a variety of structures. In some embodiments, the box 110 can include a first part 111 and a second part 112, the first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a storage space for accommodating the battery cell 121. The second part 112 can be a hollow structure with one end open, and the first part 111 can be a plate-like structure. The first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 jointly define a storage space; the first part 111 and the second part 112 can also be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be in a variety of shapes, such as a simple three-dimensional structure such as a single cuboid or a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as a cuboid or a cylinder or a sphere, and the embodiments of the present application are not limited to this. The material of the box body 110 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, etc., or a composite material such as glass fiber and epoxy resin, and the implementation mode of the present application is not limited to this.

[0052] In the embodiment of the present application, multiple battery cells 121 can directly form a battery pack, or they can first form a battery module 120, and then the battery module 120 can form a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel or mixed together to form a whole, and then the whole formed by multiple battery cells 121 is accommodated in the box 110. Alternatively, multiple battery cells 121 can first be connected in series, parallel or mixed together to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel or mixed together to form a whole, and then accommodated in the box 110.

[0053] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 121 .

[0054] In the present application, each battery cell 121 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but it is not limited thereto. The battery cell 121 can be cylindrical, flat, rectangular or other shapes. The battery cell 121 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the implementation method of the present application does not limit this. However, for the sake of simplicity, the following embodiments are all described by taking the square lithium-ion battery cell 121 as an example.

[0055] Please refer to Figure 4 , Figure 4 The schematic diagram of the exploded structure of the battery cell 121 provided in some embodiments of the present application. The battery cell 121 includes an end cap assembly 122, a housing 123, an electrode assembly 124 and other functional components.

[0056] The end cap assembly 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cap assembly 122 can be adapted to the shape of the shell 123 to match the shell 123. In some embodiments, the end cap assembly 122 can be made of a material with a certain hardness and strength, so that it is not easy to deform when squeezed and collided, so that the battery cell 121 can have a higher structural strength and the safety performance can also be improved. In some embodiments, the end cap assembly 122 can be provided with a pressure relief mechanism (not marked) for releasing the internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold.

[0057] The shell 123 is a component used to cooperate with the end cap assembly 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can be used to accommodate the electrode assembly 124, the electrolyte and other components. The shell 123 and the end cap assembly 122 can be independent components, and an opening can be set on the shell 123, and the internal environment of the battery cell 121 is formed by covering the opening with the end cap assembly 122 at the opening. Without limitation, the end cap assembly 122 and the shell 123 can also be integrated. Specifically, the end cap assembly 122 and the shell 123 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 123, the end cap assembly 122 covers the shell 123. The shell 123 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The shell 123 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0058] The electrode assembly 124 is a component in the battery cell 121 where an electrochemical reaction occurs. One or more electrode assemblies 124 may be contained in the housing 123. The electrode assembly 124 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 124, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0059] See also Figures 5 to 10 As shown, Figure 5 An exploded view of an end cap assembly provided for some embodiments of the present application; Figure 6 A cross-sectional view of an end cap assembly provided for some embodiments of the present application; Figure 7 for Figure 6 An embodiment of a C partial enlarged view of the structure shown; Figure 8 for Figure 6 Another embodiment of the C partial enlarged view of the structure shown; Fig. 9 for Figure 6 Another embodiment of the C partial enlarged view of the structure shown; Fig.10 A half-section view of a sealing ring provided in some embodiments of the present application.

[0060] A first aspect of the present application provides an end cap assembly 122 , which is used to cover the opening of a shell 123 to form an internal environment for accommodating an electrode assembly 124 .

[0061] The end cap assembly 122 includes a cover plate 10, a lower insulating plate 30, a pole 20 and a sealing ring 40. The cover plate 10 is formed with a mounting hole 11; the lower insulating plate 30 is attached to the bottom surface 13 of the cover plate 10 along the thickness direction Z; the lower insulating plate 30 is formed with a through hole 32 connected to the mounting hole 11; the pole 20 is penetrated by the mounting hole 11 and the through hole 32; the sealing ring 40 includes a first skirt 41 and a ring body 43, and the ring body 43 is nested in the mounting hole 11; the first skirt 41 is arranged at one end of the ring body 43, and the first skirt 41 is sandwiched between the lower insulating plate 30 and the bottom surface 13 of the cover plate 10.

[0062] Among them, along the thickness direction Z, the cover plate 10 has a top surface 12 and a bottom surface 13 that are arranged opposite to each other; the bottom surface 13 of the cover plate 10 refers to the side of the cover plate 10 facing the inside of the shell 123 when the end cover assembly 122 covers the opening of the shell 123 of the battery cell 121; correspondingly, the top surface 12 of the cover plate 10 is the side facing away from the inside of the shell 123. The cover plate 10 can be made of a material with a certain hardness and strength, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this. The mounting hole 11 penetrates the cover plate 10 along the thickness direction Z of the cover plate 10.

[0063] The pole 20 is a component for inputting or outputting electric energy of the battery cell 121. The pole 20 is provided with a mounting hole 11 and a through hole 32. The top of the pole 20 may protrude from the top surface 12 of the cover plate 10 along the thickness direction Z, and the bottom of the pole 20 is used to be electrically connected to the electrode assembly 124. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material in the electrode assembly 124 react with the electrolyte, and the pole lug of the electrode assembly 124 may be connected to the pole 20 through the adapter plate 50 (mentioned below) to form a current loop. The pole 20 is a conductive material, including but not limited to copper material, aluminum material or other alloy materials.

[0064] The pole 20 can be electrically connected to the electrode assembly 124 in the housing 123 through the adapter plate 50. The lower insulating plate 30 is attached to the bottom surface 13 of the cover plate 10 along the thickness direction Z, and can be used to isolate the adapter plate 50 from the housing 123, thereby effectively isolating the pole 20 from the cover plate 10, reducing the risk of short circuit between the two. Exemplarily, the lower insulating plate 30 can be plastic, rubber, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0065] The ring body 43 of the sealing ring 40 is annular, and one end of the ring body 43 along the axial direction (that is, the thickness direction Z, the same below) is connected to the first skirt 41. After the sealing ring 40 is installed, the sealing ring 40 is located between the pole 20, the adapter plate 50 and the cover plate 10, and the outer ring diameter of the ring body 43 is slightly larger than the diameter of the mounting hole 11, so that when the outer ring of the ring body 43 is nested with the mounting hole 11, the ring body 43 is in a compressed state, and the sealing ring 40 and the mounting hole 11 are fixed by the deformation of the ring body 43, and the sealing ring 40 is wrapped on the peripheral structure of the mounting hole 11. The elastic sealing ring 40 is elastically deformed and the rebound force generated by the elastic deformation is used to make the sealing ring 40 abut against the position required for sealing, so that the sealing ring 40 seals the position required for sealing, effectively avoiding the situation where the sealing fails due to the penetration of water vapor.

[0066] By setting a first skirt 41 on the sealing ring 40, the first skirt 41 extends outward radially along the mounting hole 11, and the first skirt 41 is clamped between the lower insulating plate 30 and the bottom surface 13 of the cover plate 10; when creepage occurs, the current first needs to flow horizontally in the radial direction to bypass the first skirt 41 of the sealing ring 40, and then reach the ground 13 of the cover plate 10 along the vertical gap, thereby effectively increasing the creepage distance between the bottom end of the pole 20 through the adapter plate 50 and the cover plate 10. When the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoke and fire can be effectively avoided, thereby effectively improving safety risks.

[0067] Optionally, the first skirt 41 may extend radially outwardly of the mounting hole 11 to form a circular ring shape, which is subject to the design.

[0068] Optionally, the ring body 43 is an insulating elastic member, and can be made of silicone, fluororubber, soluble polytetrafluoroethylene or polytetrafluoroethylene. Correspondingly, the first skirt 41 can be made of the same rubber or plastic as the ring body 43.

[0069] In some possible embodiments, the cross-sections of the ring body 43 , the mounting hole 11 , and the through hole 32 may generally be circular, and they are coaxially arranged with each other.

[0070] In some possible embodiments, see Figure 7 and Fig. 9 As shown, the lower insulating plate 30 includes a wrapping portion 31, which is circumferentially arranged around the edge of the through hole 32, and is configured to wrap at least a portion of the ring body 43. The wrapping portion 31 and the lower insulating plate 30 can be integrally formed, and both can be made of the same rubber or plastic material, which is simple in process and low in cost.

[0071] The wrapping portion 31 at the edge of the through hole 32 extends axially and can be cylindrical as a whole. The wrapping portion 31 is bent at a right angle and wrapped around the inner circle of the ring body 43, and the cross section on one side forms an L-shaped structure. In this way, the insulating wrapping portion 31 further covers the entrance of the gap between the first skirt 41 of the sealing ring 40 and the lower insulating plate 30. When creepage occurs, the current first needs to climb axially upward over the wrapping portion 31, and then axially downward through the gap between the wrapping portion 31 and the ring body 43, and then flow horizontally in the radial direction, bypassing the first skirt 41 of the sealing ring 40, and finally reaching the ground 13 of the cover plate 10 along the vertical gap, effectively increasing the creepage distance between the bottom end of the pole 20 and the cover plate 10. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoke and fire, and effectively improve the safety risk.

[0072] In some possible embodiments, see Fig. 9 As shown, along the thickness direction Z of the cover plate 10, the wrapping portion 31 extends upward to the top of the ring body 43, wherein the top of the ring body 43 is the end away from the first skirt 41; in this way, the creepage distance between the bottom end of the pole 20 and the cover plate 10 is maximized, and when the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoke and fire can be effectively avoided, thereby effectively improving safety risks.

[0073] In some possible embodiments, see Figure 7 As shown, the wrapping portion 31 extends upward along the thickness direction Z of the cover plate 10, and the extension length can be half or one-third of the length of the ring body 43 along the axial direction. In this way, a longer creepage distance is ensured and part of the cost can be saved. The specific length can be set according to design requirements and is not limited in the embodiments of the present application.

[0074] In some possible embodiments, see Figure 6 and Figure 8 As shown, the lower insulating plate 30 includes a first annular groove 33 arranged around the periphery of the through hole 32, and the first skirt 41 is embedded in the first annular groove 33. In this way, the contact area between the first skirt 41 and the first annular groove 33 can be made larger, thereby ensuring that the gap between the sealing ring 40 and the lower insulating plate 30 is small enough, and it is difficult for the electrolyte to enter the gap, thereby ensuring the sealing effect; under the condition of a certain creepage distance, when the insulation between the battery cell and the battery pack body fails, it can effectively avoid the electrolyte from entering the gap and causing creepage, thereby avoiding safety accidents such as ionization smoke and fire, and effectively improving safety risks.

[0075] In some possible embodiments, see Figure 7 and Fig. 9As shown, the shapes of the first annular groove 33 and the first skirt 41 should be adapted to facilitate fitting. The first annular groove 33 and the first skirt 41 can both be circular, square or other irregular shapes; this embodiment of the application is not limited.

[0076] Optionally, along the thickness direction Z of the cover plate 10, the thickness of the lower insulating plate 30 is A, and satisfies 5mm≤A≤10mm, and the depth of the first annular groove 33 is B, and satisfies 0.4*A≤B≤0.6*A; this ensures both the insulation between the two and the processing strength, and does not cause breakage. In addition, the thickness D of the first skirt 41 should be equal to the depth B of the first annular groove 33, ensuring that the first skirt 41 can be evenly embedded in the first annular groove 33.

[0077] Specifically, in the embodiment of the present application, the thickness A of the lower insulating plate 30 may be 6 mm, the depth B of the first annular groove 33 may be 3 mm, and the thickness D of the first skirt 41 may be 3 mm.

[0078] In some possible embodiments, see Figure 7 and Fig. 9 As shown, the bottom surface 13 of the cover plate 10 is concavely formed with a second annular groove 15 arranged around the circumference of the mounting hole 11 , and the first skirt 41 is embedded in the second annular groove 15 .

[0079] In this way, the contact area between the first skirt 41 and the second annular groove 15 can be made larger, thereby ensuring that the gap between the sealing ring 40 and the cover plate 10 is small enough, and it is more difficult for the electrolyte to enter the gap, thereby ensuring the sealing effect. Under the condition of a certain creepage distance, when the insulation between the battery cell and the battery pack body fails, the creepage phenomenon caused by the electrolyte entering the gap can be effectively avoided, thereby avoiding safety accidents such as ionization smoke and fire, and effectively improving safety risks.

[0080] It is understandable that the first annular groove 33 and the second annular groove 15 can be set at the same time. In this case, the thickness of the first skirt 41 should generally be the sum of the depths of the first annular groove 33 and the second annular groove 15; in addition, one of them can be selected for setting, depending on the design.

[0081] In some possible embodiments, see Figures 5 to 10 As shown, the sealing ring 40 includes a second skirt 42 , which is disposed at one end of the ring body 43 away from the first skirt 41 , and is sandwiched between the pole 20 and the top surface 12 of the cover plate 10 .

[0082] The second skirt 42 extends outward in a circular ring shape along the radial direction of the mounting hole 11. Along the axial direction of the ring body 43, the upper surface of the second skirt 42 abuts against the bottom end surface of the pole 20, and the lower surface of the second skirt 42 abuts against the top surface 12 of the cover plate 10, thereby isolating the pole 20 and the cover plate 10, preventing the two from bypassing the second skirt 42 and becoming energized, which can effectively avoid leakage and effectively improve safety risks.

[0083] Optionally, the second skirt 42 may be made of the same rubber or plastic as the ring body 43; specifically, it may be silicone, fluororubber, soluble polytetrafluoroethylene or polytetrafluoroethylene parts.

[0084] In some possible embodiments, see Figures 5 to 10 As shown, the second skirt 42 extends radially outward along the mounting hole 11 to form a circular ring; the first skirt 41 and the second skirt 42 are both in the shape of a circular ring. It should be noted that the electrolyte generally leaks from the accommodation space in the shell 123 below the end cover assembly 122 to the gap between the first skirt 41 and the lower insulating plate 30, so it is difficult for the electrolyte to enter the gap between the second skirt 42 and the cover plate 10. The radius of the first skirt 41 can be designed to be larger than the radius of the second skirt 42; in this way, it can be ensured that it is difficult for the electrolyte to enter the gap between the first skirt 41 and the lower insulating plate 30, and the creepage distance between the bottom end of the pole 20 through the adapter plate 50 to the cover plate 10 is further extended. When the insulation between the battery cell and the battery pack body fails, it can effectively avoid safety accidents such as electrolyte ionization smoke and fire, and effectively improve safety risks.

[0085] It should be pointed out that in the embodiment of the present application, along the thickness direction Z of the cover plate 10, the thickness of the second skirt 42 can be any value among 3mm, 3.3mm, 3.9mm, 4.2mm, 5mm, 6.8mm, 8mm, 9mm...

[0086] The radius of the first skirt 41 is greater than the radius of the second skirt 42 , and the difference can be designed to be 2 mm, 3 mm, 4 mm or 5 mm.

[0087] In some possible embodiments, see Figures 5 to 10 As shown, a mounting groove 45 is formed inwardly on one side of the second skirt 42 facing the first skirt 41 , and the cover plate 10 includes a protrusion 14 ; the protrusion 14 is engaged with the mounting groove 45 ; thus, the positioning and installation of the cover plate 10 and the sealing ring 40 are facilitated.

[0088] Optionally, the protrusion 14 is formed around the mounting hole 11. The mounting groove 45 can be a continuous annular groove, an arc groove, or a blind hole; correspondingly, the protrusion 14 can be a continuous annular rib, a convex strip, or a convex block, which plays a role in positioning and assembly.

[0089] In some possible embodiments, see Figures 5 to 10 As shown, the end cover assembly 122 includes an adapter plate 50 , which is installed on the side of the lower insulating plate 30 away from the cover plate 10 ; along the thickness direction Z of the cover plate 10 , part of the adapter plate 50 abuts against the bottom end of the pole 20 .

[0090] The top end of the pole 20 protrudes from one side of the top surface 12 of the cover plate 10 , and the bottom end of the pole 20 contacts the second skirt 42 of the sealing ring 40 , thereby achieving insulation.

[0091] The adapter plate 50 is generally a metal sheet structure made of copper alloy or aluminum alloy; the adapter plate 50 is used to connect the pole ear of the electrode assembly 124 and to the pole 20, thereby realizing an electrical circuit.

[0092] In the embodiment of the present application, a sealing ring 40 is provided to effectively separate the adapter plate 50 and the cover plate 10 to achieve insulation, and the first skirt 41 is clamped between the lower insulating plate 30 and the bottom surface 13 of the cover plate 10. When creepage occurs, the current of the adapter plate 50 first needs to flow horizontally in the radial direction to bypass the first skirt 41 of the sealing ring 40, and then reach the ground 13 of the cover plate 10 along the vertical gap, thereby effectively increasing the creepage distance between the bottom end of the pole 20 through the adapter plate 50 and the cover plate 10. When the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoke and fire can be effectively avoided, thereby effectively improving safety risks.

[0093] Optionally, along the thickness direction Z of the cover plate 10 , a protrusion (not shown) is provided upwardly in the middle of the adapter plate 50 , and the protrusion can pass through the through hole 32 and the mounting hole 11 and contact with the bottom end of the pole 20 to achieve electrical connection.

[0094] In some possible embodiments, see Figures 5 to 10 As shown, the end cap assembly includes an upper insulating portion 60 , which is disposed on a side of the cover plate 10 away from the lower insulating plate, and is sleeved on the peripheral side of the pole 20 to separate the pole 20 from the cover plate 10 .

[0095] Specifically, the upper insulating portion 60 can be rubber or plastic, which is used to cut off the electrical connection between the top of the pole 20 and the top surface 12 of the cover 10. In this way, the upper insulating portion 60, the sealing ring 40 and the lower insulating plate 30 are jointly enclosed between the cover 10 and the pole 20 to achieve insulation, and by setting a first skirt 41 and a second skirt 42, they are respectively fitted with the lower insulating plate 30 and the cover 10 to form a sealing surface to prevent electrolyte infiltration and effectively increase the creepage distance. When the insulation between the battery cell and the battery pack body fails, safety accidents such as electrolyte ionization smoking and fire can be effectively avoided, thereby improving safety risks.

[0096] A second aspect of the present application provides a battery cell 121 including at least one end cover assembly 122 described in the above embodiment.

[0097] A third aspect of the present application provides a battery 100 including at least one battery cell 121 described in the above embodiment.

[0098] A fourth aspect of the present application provides an electrical device 1000 , comprising at least one battery 100 described in the above embodiment, and the battery 100 is used to provide electrical energy to the electrical device 1000 .

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An end cap assembly, characterized in that: include: A cover plate (10) formed with a mounting hole (11); A lower insulating plate (30) is attached to the bottom surface (13) of the cover plate (10) in the thickness direction; the lower insulating plate (30) is formed with a through hole (32) communicating with the mounting hole (11); A pole (20) through which the mounting hole (11) and the through hole (32) are penetrated; and a sealing ring (40), comprising a first skirt (41) and a ring body (43), wherein the ring body (43) is nested in the mounting hole (11); the first skirt (41) is arranged at one end of the ring body (43) and is clamped between the lower insulating plate (30) and the bottom surface (13) of the cover plate (10).

2. The end cap assembly according to claim 1, characterized in that: The lower insulating plate (30) comprises a wrapping portion (31), the wrapping portion (31) being arranged circumferentially around the edge of the through hole (32), and the wrapping portion (31) being configured to wrap at least a portion of the ring body (43).

3. The end cap assembly according to claim 2, characterized in that: Along the thickness direction of the cover plate (10), the wrapping portion (31) extends upward to the top end of the ring body (43), and the top end of the ring body (43) is an end away from the first skirt (41).

4. The end cap assembly according to any one of claims 1 to 3, characterized in that: The lower insulating plate (30) comprises a first annular groove (33) arranged around the circumference of the through hole (32), and the first skirt (41) is embedded in the first annular groove (33).

5. The end cap assembly according to any one of claims 1 to 3, characterized in that: The first skirt (41) extends radially outwardly along the mounting hole (11) to form a circular ring shape; and / or, The first skirt (41) is made of rubber or plastic.

6. The end cap assembly according to any one of claims 1 to 3, characterized in that: The sealing ring (40) comprises a second skirt (42), the second skirt (42) being arranged at an end of the ring body (43) away from the first skirt (41) and being sandwiched between the pole (20) and the top surface (12) of the cover plate (10).

7. The end cap assembly according to claim 6, characterized in that: The first skirt (41) and the second skirt (42) are both in the shape of a ring, and the radius of the first skirt (41) is greater than the radius of the second skirt (42).

8. The end cap assembly according to claim 6, characterized in that: A mounting groove (45) is formed inwardly on one side of the second skirt (42) facing the first skirt (41), and the cover plate (10) comprises a protruding portion (14); the protruding portion (14) is engaged and connected with the mounting groove (45).

9. The end cap assembly according to any one of claims 1 to 3, characterized in that: The end cover assembly comprises an adapter plate (50), wherein the adapter plate (50) is mounted on a side of the lower insulating plate (30) facing away from the cover plate (10); Along the thickness direction of the cover plate (10), a portion of the adapter plate (50) abuts against the bottom end of the pole (20).

10. The end cap assembly according to any one of claims 1 to 3, characterized in that: The end cover assembly comprises an upper insulating portion (60), the upper insulating portion (60) being arranged on a side of the cover plate (10) away from the lower insulating plate, and the upper insulating portion (60) being sleeved on the peripheral side of the pole (20) to separate the pole (20) from the cover plate (10).

11. A battery cell, characterized in that: The battery cell comprises the end cap assembly according to any one of claims 1 to 10.

12. A battery, characterized in that: The battery comprises the battery cell as claimed in claim 11.

13. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 12, wherein the battery is used to provide electrical energy.

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