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 an electrode lead-out hole; the terminal plate is arranged on one side of the cover plate along the axial direction of the electrode lead-out hole; the insulation part is clamped between the cover plate and the terminal plate, the electrode terminal is inserted into the electrode leading-out hole and penetrates through the insulation part and the terminal plate, and the electrode terminal is in insulation connection with the cover plate; wherein at least one of the cover plate and the terminal plate is provided with a groove, and the insulating part is filled in the groove. According to the end cover assembly, the battery monomer, the battery and the power utilization device provided by the embodiment of the invention, the risk that deposited electrolyte enters the battery monomer is reduced, so that the reliability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an end cover assembly, a battery cell, a battery, and an electric device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the related art, for the end cover assembly of a battery cell, there is a problem that the electrolyte accumulated between the components of the end cover assembly enters the interior of the battery cell, and the reliability of the end cover assembly needs to be improved. Summary of the Utility Model

[0004] The embodiments of the present application provide an end cover assembly, a battery cell, a battery, and an electric device. The end cover assembly reduces the risk of accumulated electrolyte entering the interior of the battery cell, thereby improving the reliability of the end cover assembly.

[0005] On the one hand, according to an embodiment of the present application, an end cover assembly is provided, including: a cover plate having an electrode lead-out hole; a terminal plate disposed on one side of the cover plate along the axial direction of the electrode lead-out hole; an insulating member clamped between the cover plate and the terminal plate; and an electrode terminal inserted into the electrode lead-out hole and passing through the insulating member and the terminal plate, and the electrode terminal is insulatedly connected to the cover plate; wherein, at least one of the cover plate and the terminal plate is provided with a groove, and the insulating member is filled in the groove.

[0006] The end cover assembly provided by an embodiment of the present application includes a cover plate, a terminal plate, an insulating member, and an electrode terminal. The insulating member is clamped between the cover plate and the terminal plate to insulate them. The setting of the electrode terminal can not only ensure the electrical connection requirement with the electrode assembly to realize the charging and discharging of the applied battery cell, but also ensure that the cover plate, the terminal plate, and the insulating member are connected as a whole. Since at least one of the cover plate and the terminal plate is provided with a groove and the insulating member is filled in the groove, when the electrolyte accumulated between the components of the end cover assembly spreads towards the electrode lead-out hole, the spreading path of the electrolyte can be extended, the probability of the electrolyte entering the interior of the battery cell through the electrode lead-out hole can be reduced, and the reliability of the battery cell can be improved.

[0007] According to an aspect of the embodiments of the present application, the groove is annular and surrounds the electrode terminal.

[0008] For the end cap assembly provided by an embodiment of the present application, by making the groove annular and arranged around the electrode terminal, the electrolyte entering from any direction of the gap formed by the insulating part, the cover plate and the terminal plate can be blocked, effectively reducing the probability of the electrolyte entering the battery cell interior from the electrode lead-out hole and improving the reliability of the battery cell.

[0009] According to one aspect of the embodiment of the present application, the number of grooves provided on at least one of the cover plate and the terminal plate is more than two, and the more than two grooves are arranged at intervals in the radial direction of the electrode lead-out hole.

[0010] For the end cap assembly provided by an embodiment of the present application, by the number of grooves provided on at least one of the cover plate and the terminal plate being more than two, and the more than two grooves being arranged at intervals in the radial direction of the electrode lead-out hole. The electrolyte entering the gap formed by the insulating part, the cover plate and the terminal plate can be blocked at multiple levels, further extending the spreading path of the electrolyte and ensuring the reliability of the battery cell.

[0011] According to one aspect of the embodiment of the present application, the more than two grooves are all annular grooves and are coaxially arranged with each other.

[0012] For the end cap assembly provided by an embodiment of the present application, by making the more than two grooves all annular grooves and coaxially arranged with each other. It can not only ensure the extension of the spreading path of the electrolyte, but also ensure the strength of the cover plate and the terminal plate and the bearing capacity of the end cap assembly.

[0013] According to one aspect of the embodiment of the present application, grooves are provided on both the cover plate and the terminal plate, and along the axial direction, the grooves provided on the cover plate and the grooves provided on the terminal plate are arranged staggeredly with each other.

[0014] For the end cap assembly provided by an embodiment of the present application, by making the grooves provided on the cover plate and the grooves provided on the terminal plate arranged staggeredly with each other, it can not only extend the spreading path of the electrolyte, but also facilitate the molding of the insulating part and the assembly between the cover plate and the terminal plate.

[0015] According to one aspect of the embodiment of the present application, a first groove is provided on the cover plate, and along the axial direction, the value range of the ratio of the depth of the first groove to the thickness of the cover plate is: 1 / 4 to 1 / 2.

[0016] For the end cap assembly provided by an embodiment of the present application, by making the value range of the ratio of the depth of the first groove on the cover plate to the thickness of the cover plate be 1 / 4 to 1 / 2, it can not only extend the spreading path of the electrolyte entering from the gap between the cover plate and the insulating part, but also ensure the bearing capacity of the cover plate, thereby ensuring the reliability of the end cap assembly.

[0017] According to one aspect of the embodiments of the present application, a second groove is provided on the terminal board. Along the axial direction, the value range of the ratio of the depth of the second groove to the thickness of the cover plate is: 1 / 4 to 1 / 2.

[0018] For the end cover assembly provided by an embodiment of the present application, by making the value range of the ratio of the depth of the second groove on the terminal board to the thickness of the terminal board be 1 / 4 to 1 / 2, it can not only extend the spreading path of the electrolyte entering through the gap between the terminal board and the insulating part, but also ensure the bearing capacity of the terminal board, thereby ensuring the reliability of the end cover assembly.

[0019] According to one aspect of the embodiments of the present application, the insulating part has an outer peripheral surface surrounding the terminal board. The outer peripheral surface is a conical surface and has a first port and a second port in the axial direction. The radial dimension of the first port is smaller than that of the second port, and the second port faces the cover plate.

[0020] For the end cover assembly provided by an embodiment of the present application, through the above settings, the electrolyte on the end cover assembly cannot accumulate at the step formed at the contact end between the insulating part, the terminal board and the cover plate, and is easy to wipe clean, further ensuring the reliability of the end cover assembly and the battery cell to which it is applied.

[0021] According to one aspect of the embodiments of the present application, the insulating part is provided with a recess on the side facing the terminal board in the axial direction. The shape of the terminal board matches the shape of the recess and at least partially extends into the recess. The bottom wall of the recess is provided with a protruding part, and the shape of the protruding part matches the shape of the groove and extends into the groove.

[0022] For the end cover assembly provided by an embodiment of the present application, through the above settings, not only can the insulating part be used to insulate the terminal board from the cover plate, but also the insulating part can be used to limit the position of the terminal board. Moreover, the protruding part provided on the bottom wall of the recess can ensure the cooperation with the groove to meet the requirement of extending the spreading path of the electrolyte.

[0023] According to one aspect of the embodiments of the present application, the number of electrode lead-out holes is two or more and they are arranged at intervals. Each electrode lead-out hole is provided with an electrode terminal, and the groove surrounds each electrode terminal.

[0024] On the other hand, according to an embodiment of the present application, a battery cell is provided, including the above-mentioned battery cell.

[0025] On yet another aspect, according to an embodiment of the present application, a battery is provided, including the above-mentioned battery cell, and the battery cell is housed in a box body.

[0026] On still another aspect, according to the present application, an electrical device includes the above-mentioned battery. Description of the Drawings

[0027] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0028] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

[0030] Figure 3 is an exploded structural schematic diagram of a battery module according to an embodiment of the present application;

[0031] Figure 4 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0032] Figure 5 is Figure 4 a bottom view of the battery cell shown;

[0033] Figure 6 is Figure 5 a cross-sectional schematic diagram of the battery cell shown along the A-A direction;

[0034] Figure 7 is a cross-sectional schematic diagram of an end cap assembly according to an embodiment of the present application;

[0035] Figure 8 is a cross-sectional schematic diagram of an end cap assembly according to another embodiment of the present application;

[0036] Figure 9 is a cross-sectional schematic diagram of an end cap assembly according to still another embodiment of the present application.

[0037] Wherein:

[0038] 1 - vehicle;

[0039] 10 - battery; 20 - battery module; 30 - controller; 40 - motor;

[0040] 301 - first box body part; 302 - second box body part;

[0041] 21 - battery cell;

[0042] 211 - end cap assembly;

[0043] 2111 - cover plate; 2111a - electrode lead-out hole; 2112 - terminal plate; 2113 - insulating member;

[0044] 2113a - outer peripheral surface; 2113b - recess; 2114 - electrode terminal; 2115 - groove; 2115a - first groove; 2115b - second groove; 2116 - protrusion;

[0045] 212 - housing;

[0046] 213 - electrode assembly;

[0047] X - axial direction; Y - radial direction.

[0048] In the drawings, like parts are designated by like reference numerals. The drawings are not drawn to scale. Detailed implementation manners

[0049] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0050] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0051] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application.

[0052] In addition, technical terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific situations.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc.

[0057] The battery cell may be a secondary battery cell, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0058] The battery cell includes a housing, an end cover assembly, an electrode assembly and an electrolyte. The electrode assembly is arranged inside the housing, the electrolyte is filled in the housing, and the end cover assembly is arranged to seal the opening of the housing.

[0059] The applicant has noticed that in the battery cells in the related art, the battery cells often cause electrolyte to contaminate the end cover assembly due to problems such as inaccurate injection equipment accuracy. Due to the high group margin design of cylindrical batteries, this phenomenon is particularly obvious. When a certain amount of electrolyte enters the end cover assembly, that is, inside the battery cell, through the insulating part, it will reduce the resistance value between the electrode block and the cover plate, resulting in a decrease in the negative electrode voltage. The chemical reaction of lithium intercalation occurs inside the housing, causing the aluminum shell to be corroded and penetrated, resulting in leakage. Further research found that when the electrolyte on the surface of the cover plate is not wiped off in time, the electrolyte will enter the inside of the cover plate from the gaps between the insulating part and the cover plate and between the insulating parts, and it will not be able to be removed later, resulting in a short circuit between the terminal board and the cover plate, thereby affecting the reliability of the end cover assembly.

[0060] Based on the above considerations, after in-depth research, the applicant has designed an end cover assembly, which includes a cover plate, a terminal plate, an insulating member, and an electrode terminal. The cover plate has an electrode lead-out hole; the terminal plate is arranged on one side of the cover plate along the axial direction of the electrode lead-out hole; the insulating member is clamped between the cover plate and the terminal plate, the electrode terminal is inserted into the electrode lead-out hole and penetrates through the insulating member and the terminal plate, and the electrode terminal is insulated and connected to the cover plate; wherein, at least one of the cover plate and the terminal plate is provided with a groove, and the insulating member is filled in the groove. The end cover assembly reduces the risk of accumulated electrolyte entering the interior of the battery cell, thereby improving its own reliability.

[0061] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, electric vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0062] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the devices described above, but also applicable to all devices using batteries. However, for the sake of brevity of description, the following embodiments will be described by taking electric vehicles as an example.

[0063] For example, as Figure 1 shown, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application is shown. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. A motor 40, a controller 30, and a battery 10 can be arranged inside the vehicle 1. The controller 30 is used to control the power supply of the battery 10 to the motor 40. For example, the battery 10 can be arranged at the bottom, the front end, or the rear end of the vehicle 1. The battery 10 can be used for the power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1, but also as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0064] As Figure 2 and Figure 3 shown, in order to meet different power usage requirements, the battery 10 can include a plurality of battery cells. Among them, the plurality of battery cells can be connected in series, in parallel, or in a series-parallel combination. The series-parallel combination means a combination of series and parallel. A battery can also be referred to as a battery pack. Optionally, the plurality of battery cells can first be connected in series, in parallel, or in a series-parallel combination to form a battery module 20, and then the plurality of battery modules 20 can be connected in series, in parallel, or in a series-parallel combination to form a battery. That is to say, the plurality of battery cells can directly form a battery, or can first form a battery module, and then the battery module forms a battery.

[0065] For example, as Figure 2 shown, a schematic structural view of a battery 10 according to an embodiment of the present application is provided. The battery 10 may include a plurality of battery cells 21. The battery 10 may further include a box body (or a cover body). The interior of the box body is a hollow structure, and the plurality of battery cells are accommodated in the box body.

[0066] The box body may be a simple three-dimensional structure such as a separate cuboid, cylinder, or sphere, or a complex three-dimensional structure formed by combining simple three-dimensional structures such as a cuboid, cylinder, or sphere. The embodiments of the present application do not limit this. The material of the box body may be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin. The embodiments of the present application do not limit this either.

[0067] The box body is used to accommodate the battery cells 21, and the box body may have various structures. In some embodiments, the box body may include a first box body part 301 and a second box body part 302. The first box body part 301 and the second box body part 302 are covered with each other, and the first box body part 301 and the second box body part 302 jointly define an accommodation space for accommodating the battery cells. The second box body part 302 may be a hollow structure with one end open, and the first box body part 301 is a plate-like structure. The first box body part 301 covers the opening side of the second box body part 302 to form a box body with an accommodation space; both the first box body part 301 and the second box body part 302 may also be hollow structures with one side open, and the opening side of the first box body part 301 covers the opening side of the second box body part 302 to form a box body with an accommodation space. Of course, the first box body part 301 and the second box body part 302 may have various shapes, such as a cylinder, a cuboid, etc.

[0068] To improve the sealing performance after the connection between the first box body part 301 and the second box body part 302, a sealing member such as sealant, sealing ring, etc. may be provided between the first box body part 301 and the second box body part 302.

[0069] Assume that the first box body part 301 covers the top of the second box body part 302. The first box body part 301 may also be referred to as an upper box cover, and the second box body part 302 may also be referred to as a lower box body.

[0070] In the battery 10, the battery cells 21 may be one or more. If there are multiple battery cells 21, they can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 21. The multiple battery cells 21 can be directly connected in series, parallel, or in a combined series-parallel connection and then the whole formed by the multiple battery cells 21 is accommodated in a box. Of course, it is also possible that multiple battery cells are first connected in series, parallel, or in a combined series-parallel connection to form battery modules 20, and then multiple battery modules 20 are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in a box.

[0071] In some embodiments, as Figure 3 shown, there are multiple battery cells 21. The multiple battery cells 21 are first connected in series, parallel, or in a combined series-parallel connection to form battery modules 20. Then multiple battery modules 20 are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in a box.

[0072] The multiple battery cells 21 in the battery module 20 can be electrically connected through a busbar component to achieve parallel, series, or combined series-parallel connection of the multiple battery cells 21 in the battery module 20.

[0073] In this application, the battery cell 21 can include a lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell 21 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of this application are also not limited thereto. Generally, battery cells 21 are divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application are also not limited thereto. However, for the sake of concise description, the following embodiments will be described taking the cylindrical battery cell 21 as an example.

[0074] As Figures 4 to 7As shown, the battery cell 21 includes a housing 212, an electrode assembly 213, and an end cap assembly 211. The housing 212 is a component used to cooperate with the end cap assembly 211 to form the internal environment of the battery cell 21. Among them, the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte (not shown in the figure), and other components. The housing 212 and the end cap assembly 211 can be independent components. An opening can be provided on the housing 212, and the end cap assembly 211 is covered at the opening to form the internal environment of the battery cell 21. Without limitation, the end cap assembly 211 and the housing 212 can also be integrated. Specifically, the end cap assembly 211 and the housing 212 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 212, the end cap assembly 211 is then covered on the housing 212. The housing 212 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations on this.

[0075] The electrode assembly 213 is a component in the battery cell 21 where an electrochemical reaction occurs. The housing 212 can contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the electrode tabs (not shown in the figure). The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0076] The end cap assembly 211 refers to a component that covers the opening of the housing 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap assembly 211 can be adapted to the shape of the housing 212 to cooperate with the housing 212.

[0077] The end cover assembly 211 includes a cover plate 2111, a terminal plate 2112, an insulating member 2113, and an electrode terminal 2114. The cover plate 2111 has an electrode lead-out hole 2111a. The terminal plate 2112 is disposed on one side of the cover plate 2111 along the axial direction X of the electrode lead-out hole 2111a. The insulating member 2113 is clamped between the cover plate 2111 and the terminal plate 2112. The electrode terminal 2114 is inserted into the electrode lead-out hole 2111a and is disposed through the insulating member 2113 and the terminal plate 2112. The electrode terminal 2114 is insulatedly connected to the cover plate 2111. Wherein, at least one of the cover plate 2111 and the terminal plate 2112 is provided with a groove 2115, and the insulating member 2113 is filled in the groove 2115. The end cover assembly 211 reduces the risk of accumulated electrolyte entering the interior of the battery cell, thereby improving the reliability of the battery cell.

[0078] The cover plate 2111 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover plate 2111 is not easily deformed when being squeezed or collided, enabling the battery cell to have higher structural strength and improved safety performance. The material of the cover plate 2111 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0079] The terminal plate 2112 is disposed outside the cover plate 2111 and is used to connect to the electrode terminal 2114. In the battery, the terminal plate 2112 is used to connect to the current collecting component to achieve electrical connection between multiple battery cells. In some examples, the terminal plate 2112 is provided with a through hole, and the electrode terminal 2114 extends into the through hole and is riveted to the terminal plate 2112. In other examples, the electrode terminal 2114 can also be connected to the terminal plate 2112 by other means, such as welding.

[0080] The insulating member 2113 is disposed between the cover plate 2111 and the terminal plate 2112 and is used to separate the cover plate 2111 and the terminal plate 2112. The insulating member 2113 can be plastic, rubber, etc.

[0081] The groove 2115 can be provided on the cover plate 2111, or can be provided on the terminal plate 2112. Of course, the groove 2115 can also be provided on both the cover plate 2111 and the terminal plate 2112. The insulating member 2113 can be filled and snap-fitted into the card slot. The insulating member 2113 can partially protrude and extend into the groove 2115.

[0082] The groove 2115 can be a closed annular groove, or can be a plurality of intermittently arranged arc grooves, etc.

[0083] When the cover plate 2111 is provided with a groove 2115, the number of the provided grooves 2115 can be one, or can be two or more. When the terminal plate 2112 is provided with a groove 2115, similarly, the number of the provided grooves 2115 can be one, or can be two or more.

[0084] The end cover assembly 211 provided by an embodiment of the present application includes a cover plate 2111, a terminal plate 2112, an insulating member 2113, and an electrode terminal 2114. The insulating member 2113 is clamped between the cover plate 2111 and the terminal plate 2112 to insulate the two. The setting of the electrode terminal 2114 can not only ensure the electrical connection requirement with the electrode assembly 213 to realize the charge and discharge of the applied battery cell 21, but also ensure that the cover plate 2111, the terminal plate 2112, and the insulating member 2113 are connected as a whole. Since at least one of the cover plate 2111 and the terminal plate 2112 is provided with a groove 2115, and the insulating member 2113 fills the groove 2115, when the electrolyte accumulated between the components of the end cover assembly 211 spreads toward the electrode lead-out hole 2111a, the spreading path of the electrolyte can be extended, the probability of the electrolyte entering the interior of the battery cell 21 from the electrode lead-out hole 2111a can be reduced, and the reliability of the end cover assembly 211 can be improved.

[0085] In some optional embodiments, for the end cover assembly 211 provided by an embodiment of the present application, the groove 2115 is annular and is arranged around the electrode terminal 2114.

[0086] The groove 2115 can be a circular ring groove, an elliptical ring groove, or a polygonal ring groove.

[0087] The groove 2115 being arranged around the electrode terminal 2114 can be understood as: when the number of the electrode terminals 2114 is two or more, the groove 2115 can be arranged around each electrode terminal 2114.

[0088] For the end cover assembly 211 provided by an embodiment of the present application, by making the groove 2115 be annular and be arranged around the electrode terminal 2114, the electrolyte entering from any direction of the gap formed by the insulating member 2113, the cover plate 2111, and the terminal plate 2112 can be blocked, the probability of the electrolyte entering the interior of the battery cell 21 from the electrode lead-out hole 2111a can be effectively reduced, and the reliability of the battery cell 21 can be improved.

[0089] As Figure 8 shown, in some optional embodiments, for the end cover assembly 211 provided by an embodiment of the present application, the number of the grooves 2115 provided on at least one of the cover plate 2111 and the terminal plate 2112 is two or more, and the two or more grooves 2115 are arranged at intervals in the radial direction Y of the electrode lead-out hole 2111a.

[0090] Optionally, there may be provided more than two grooves 2115 on the cover plate 2111, and the more than two grooves 2115 are spaced apart in the radial direction Y of the electrode lead-out hole 2111a. Of course, there may also be provided more than two grooves 2115 on the terminal plate 2112, and the more than two grooves 2115 are spaced apart in the radial direction Y of the electrode lead-out hole 2111a.

[0091] When there are grooves 2115 provided on both the cover plate 2111 and the terminal plate 2112, the number of the provided grooves 2115 may be equal. Of course, it is also possible to make the number of grooves 2115 provided on one of the cover plate 2111 and the terminal plate 2112 greater than the number of grooves 2115 provided on the other.

[0092] When the shape of the electrode lead-out hole 2111a is a circular hole, the radial direction Y of the electrode lead-out hole 2111a can be understood as the radial direction of the circular hole. When the shape of the electrode lead-out hole 2111a is a polygonal hole, the radial direction Y of the electrode lead-out hole 2111a can be the radial direction of the inscribed circle or the circumscribed circle of the polygonal hole.

[0093] In an embodiment of the present application, for the end cap assembly 211 provided, since the number of grooves 2115 provided on at least one of the cover plate 2111 and the terminal plate 2112 is more than two, and the more than two grooves 2115 are spaced apart in the radial direction Y of the electrode lead-out hole 2111a, the electrolyte entering from the gap formed by the insulating member 2113, the cover plate 2111, and the terminal plate 2112 can be blocked at multiple levels, further extending the spreading path of the electrolyte and ensuring the reliability of the end cap assembly 211 and the battery cell 21 to which it is applied.

[0094] In some optional embodiments, for the end cap assembly 211 provided in an embodiment of the present application, the more than two grooves 2115 are all annular grooves and are coaxially arranged with each other.

[0095] Being coaxially arranged with each other can be connected such that the grooves 2115 are concentric. When the number of grooves 2115 is more than two, the distance between every two adjacent grooves 2115 may be equal. Of course, it is also possible to make the distance between every two adjacent grooves 2115 unequal.

[0096] In an embodiment of the present application, for the end cap assembly 211 provided, by making the more than two grooves 2115 all annular grooves and coaxially arranged with each other, it can not only ensure the extension of the spreading path of the electrolyte, but also ensure the strength of the cover plate 2111 and the terminal plate 2112, thereby ensuring the load-bearing capacity of the end cap assembly 211.

[0097] Such as Figure 9As shown, in some optional embodiments, an embodiment of the present application provides an end cover assembly 211, a cover plate 2111 and a terminal plate 2112 are both provided with grooves 2115, and along the axial direction X, the grooves 2115 provided on the cover plate 2111 and the grooves 2115 provided on the terminal plate 2112 are staggered with each other.

[0098] The axial direction X along the electrode lead-out hole 2111 a can also be understood as the direction along which the electrode lead-out hole 2111 a penetrates the cover plate 2111 , or in other words, the thickness direction of the cover plate 2111 .

[0099] The staggered arrangement of the groove 2115 on the cover plate 2111 and the groove 2115 on the terminal plate 2112 can be understood as the orthographic projections of the groove 2115 on the cover plate 2111 and the groove 2115 on the terminal plate 2112 on the axial direction X do not overlap.

[0100] An end cap assembly 211 provided in an embodiment of the present application can extend the diffusion path of the electrolyte and facilitate the molding of the insulating member 2113, thereby facilitating the assembly between the cover plate 2111 and the terminal plate 2112 by staggering the grooves 2115 arranged on the cover plate 2111 and the grooves 2115 arranged on the terminal plate 2112.

[0101] Continue reading Figures 7 to 9 As shown, in some optional embodiments, a first groove 2115a is provided on the cover plate 2111, and along the axial direction X, the ratio of the depth d1 of the first groove 2115a provided on the cover plate 2111 to the thickness D1 of the cover plate 2111 is in the range of 1 / 4 to 1 / 2.

[0102] The ratio of the depth d1 of the first groove 2115a provided on the cover plate 2111 to the thickness D1 of the cover plate 2111 may be any value between 1 / 4 and 1 / 2, including the two end values ​​of 1 / 4 and 1 / 2, and may be 1 / 3.

[0103] The depth d1 of the first groove 2115a on the cover plate 2111 can be understood as the vertical distance from the surface of the cover plate 2111 facing the insulating member 2113 to the bottom wall of the first groove 2115a, and the thickness D1 of the cover plate 2111 can be understood as the vertical distance between the surface of the cover plate 2111 facing the insulating member 2113 and the surface of the cover plate 2111 away from the insulating member 2113.

[0104] In an embodiment of the present application, for the end cap assembly 211, by making the ratio of the depth d1 of the first groove 2115a on the cover plate 2111 to the thickness D1 of the cover plate 2111 fall within the range of 1 / 4 to 1 / 2, it is possible to not only extend the spreading path of the electrolyte entering through the gap between the cover plate 2111 and the insulating member 2113, but also ensure the load-bearing capacity of the cover plate 2111, thereby ensuring the reliability of the end cap assembly 211.

[0105] In some alternative embodiments, for the end cap assembly 211 provided in an embodiment of the present application, a second groove 2115b is provided on the terminal plate 2112. Along the axial direction X, the ratio of the depth d2 of the second groove 2115b provided on the terminal plate 2112 to the thickness D2 of the cover plate 2111 falls within the range of: 1 / 4 to 1 / 2.

[0106] The ratio of the depth d2 of the second groove 2115b provided on the terminal plate 2112 to the thickness D2 of the terminal plate 2112 can take any value between 1 / 4 and 1 / 2, including the two end values of 1 / 4 and 1 / 2, and can be optionally 1 / 3.

[0107] The depth of the second groove 2115b on the terminal plate 2112 can be understood as the vertical distance from the surface of the terminal plate 2112 facing the insulating member 2113 to the bottom wall of the first groove 2115b, and the thickness of the terminal plate 2112 can be understood as the vertical distance between the surface of the terminal plate 2112 facing the insulating member 2113 and the surface of the terminal plate 2112 facing away from the insulating member 2113.

[0108] In an embodiment of the present application, for the end cap assembly 211, by making the ratio of the depth of the second groove 2115b on the terminal plate 2112 to the thickness of the terminal plate 2112 fall within the range of 1 / 4 to 1 / 2, it is possible to not only extend the spreading path of the electrolyte entering through the gap between the terminal plate 2112 and the insulating member 2113, but also ensure the load-bearing capacity of the terminal plate 2112, thereby ensuring the reliability of the end cap assembly 211.

[0109] In some alternative embodiments, for the end cap assembly 211 provided in an embodiment of the present application, the insulating member 2113 has an outer peripheral surface 2113a surrounding the terminal plate 2112. The outer peripheral surface 2113a is a conical surface and has a first port and a second port in the axial direction X. The radial dimension of the first port is smaller than that of the second port, and the second port faces the cover plate 2111.

[0110] The insulating member 2113 can be a block-shaped structure. In the axial direction X, the insulating member 2113 can have a first end face and a second end face, and the outer peripheral face 2113a is connected between the first end face and the second end face. The orthographic projection area of the first end face in the axial direction X can be smaller than the orthographic projection area of the second end face in the axial direction X, so that the outer peripheral face 2113a is a conical face.

[0111] For the end cap assembly 211 provided by an embodiment of the present application, through the above settings, the electrolyte on the end cap assembly 211 cannot accumulate at the step formed at the contact end between the insulating member 2113, the terminal plate 2112, and the cover plate 2111, and is easy to wipe clean, further ensuring the reliability of the end cap assembly 211 and the battery cell 21 to which it is applied.

[0112] In some alternative embodiments, for the end cap assembly 211 provided by an embodiment of the present application, a recess 2113b is provided on the side of the insulating member 2113 facing the terminal plate 2112 in the axial direction X. The shape of the terminal plate 2112 matches the shape of the recess 2113b and at least partially extends into the recess 2113b. A protrusion 2116 is provided on the bottom wall of the recess 2113b. The shape of the protrusion 2116 matches the shape of the groove 2115 and extends into the groove 2115.

[0113] The terminal plate 2112 can be inserted into the recess 2113b to fill the recess 2113b.

[0114] The bottom wall of the recess 2113b can be provided with protrusions 2116 at both the end facing the terminal plate 2112 and the end facing the cover plate 2111. The protrusions 2116 are used to fill the grooves 2115 of the terminal plate 2112 and the cover plate 2111.

[0115] For the end cap assembly 211 provided by an embodiment of the present application, through the above settings, the insulating member 2113 can not only achieve insulation between the terminal plate 2112 and the cover plate 2111, but also limit the terminal plate 2112 through the insulating member 2113. Moreover, the protrusion 2116 provided on the bottom wall of the recess 2113b can ensure the cooperation with the groove 2115 to meet the requirement of extending the spreading path of the electrolyte.

[0116] In some alternative embodiments, for the end cap assembly 211 provided by an embodiment of the present application, the number of electrode lead-out holes 2111a is two or more and they are arranged at intervals. Each electrode lead-out hole 2111a is provided with an electrode terminal 2114, and the groove 2115 is arranged around each electrode terminal 2114.

[0117] Optionally, the number of the electrode lead holes 2111a may be two. Of course, it may also be more than two. An electrode terminal 2114 is disposed in each of the electrode lead holes 2111a. The electrode terminal 2114 is insulated from the cover plate 2111 and electrically connected to the terminal plate 2112.

[0118] For the end cap assembly 211 provided in an embodiment of the present application, through the above settings, it can not only ensure the electrical connection requirements of the end cap assembly 211 with devices such as the electrode assembly 213 when used for the battery cell 21, but also extend the path for the electrolyte entering from all directions to spread into the electrode lead holes 2111a, ensuring the reliability of the end cap assembly 211 and the battery cell 21 to which it is applied.

[0119] As Figure 7 shown, the end cap assembly 211 provided in an embodiment of the present application includes a cover plate 2111, a terminal plate 2112, an insulating member 2113, and an electrode terminal 2114. The cover plate 2111 has an electrode lead hole 2111a. The terminal plate 2112 is disposed on one side of the cover plate 2111 along the axial direction X of the electrode lead hole 2111a. The insulating member 2113 is clamped between the cover plate 2111 and the terminal plate 2112. The electrode terminal 2114 is inserted into the electrode lead hole 2111a and penetrates through the insulating member 2113 and the terminal plate 2112. The electrode terminal 2114 is insulated from the cover plate 2111. Wherein, grooves 2115 are provided on the cover plate 2111 and the terminal plate 2112. The grooves 2115 are annular and surround the electrode terminal 2114. The insulating member 2113 is filled in the grooves 2115. Along the axial direction X, the groove 2115 provided on the cover plate 2111 and the groove 2115 provided on the terminal plate 2112 are staggered from each other. Along the axial direction X, the ratio of the depth of the groove 2115 provided on the cover plate 2111 to the thickness of the cover plate 2111 ranges from 1 / 4 to 1 / 2. The ratio of the depth of the groove 2115 provided on the terminal plate 2112 to the thickness of the cover plate 2111 ranges from 1 / 4 to 1 / 2. The insulating member 2113 has an outer peripheral surface 2113a surrounding the terminal plate 2112. The outer peripheral surface 2113a is a conical surface and has a first port and a second port in the axial direction X. The radial dimension of the first port is smaller than that of the second port. The second port faces the cover plate 2111. A recess 2113b is provided on the side of the insulating member 2113 facing the terminal plate 2112 in the axial direction X. The shape of the terminal plate 2112 matches the shape of the recess 2113b and at least partially extends into the recess 2113b. A protrusion 2116 is provided on the bottom wall of the recess 2113b. The shape of the protrusion 2116 matches the shape of the groove 2115 and extends into the groove 2115. The number of the electrode lead holes 2111a is two and they are spaced apart from each other. An electrode terminal 2114 is disposed in each of the electrode lead holes 2111a. The grooves 2115 surround each electrode terminal 2114.

[0120] On the other hand, according to an embodiment of the present application, a battery cell is provided, including the above-mentioned battery cell.

[0121] On another aspect, according to an embodiment of the present application, a battery is provided, including the above-mentioned battery cell, and the battery cell is housed in a box.

[0122] On yet another aspect, according to the present application, an electrical device includes the above-mentioned battery.

[0123] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An end cap assembly, characterized in that: include: A cover plate having an electrode lead-out hole; A terminal plate, arranged on one side of the cover plate along the axial direction of the electrode lead-out hole; an insulating member, clamped between the cover plate and the terminal plate, An electrode terminal is inserted into the electrode lead-out hole and penetrates the insulating member and the terminal plate, and the electrode terminal is insulated and connected to the cover plate; Wherein, at least one of the cover plate and the terminal plate is provided with a groove, and the insulating member is filled in the groove.

2. The end cap assembly according to claim 1, characterized in that: The groove is annular and is arranged around the electrode terminal.

3. The end cap assembly according to claim 1 or 2, characterized in that: The number of the grooves provided on at least one of the cover plate and the terminal plate is two or more, and the two or more grooves are spaced apart in the radial direction of the electrode lead-out hole.

4. The end cap assembly according to claim 3, characterized in that: The two or more grooves are both annular grooves and are coaxially arranged with each other.

5. The end cap assembly according to any one of claims 1 to 4, characterized in that: The grooves are both provided on the cover plate and the terminal plate. Along the axial direction, the grooves provided on the cover plate and the grooves provided on the terminal plate are staggered with each other.

6. The end cap assembly according to any one of claims 1 to 4, characterized in that: The cover plate is provided with a first groove, and along the axial direction, the ratio of the depth of the first groove to the thickness of the cover plate is in the range of 1 / 4 to 1 / 2.

7. The end cap assembly according to any one of claims 1 to 4, characterized in that: The terminal is provided with a second groove, and along the axial direction, the ratio of the depth of the second groove to the thickness of the cover plate is in the range of 1 / 4 to 1 / 2.

8. The end cap assembly according to any one of claims 1 to 4, characterized in that: The insulating member has an outer peripheral surface surrounding the terminal plate, the outer peripheral surface is a conical surface and has a first port and a second port in the axial direction, the radial dimension of the first port is smaller than the radial dimension of the second port, and the second port is arranged toward the cover plate.

9. The end cap assembly according to any one of claims 1 to 4, characterized in that: The insulating member is provided with a recess on one side of the terminal plate in the axial direction, the shape of the terminal plate matches the shape of the recess and at least partially extends into the recess, and the bottom wall of the recess is provided with a protrusion, the shape of the protrusion matches the shape of the groove and extends into the groove.

10. The end cap assembly according to any one of claims 1 to 4, characterized in that: The number of the electrode lead-out holes is more than two and they are arranged at intervals from each other. The electrode terminal is arranged in each of the electrode lead-out holes, and the groove is arranged around each of the electrode terminals.

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

12. A battery, characterized in that: The invention comprises a box body and the battery cell according to claim 11, wherein the battery cell is accommodated in the box body.

13. An electrical device, characterized in that: Comprising the battery of claim 12.

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