WO2023207402A1 - Top cap assembly, battery cell, battery and power consuming apparatus - Google Patents

Abstract

The present application relates to the technical field of batteries, and specifically discloses a top cap assembly, a battery cell, a battery and a power consuming apparatus. The top cap assembly of the present application comprises a base and a valve plate, wherein the base is annularly arranged at an outer edge of the valve plate, the valve plate is provided with at least one connecting notch and at least one bursting notch, the connecting notch and the bursting notch are connected to each other and enclose and form at least two bursting regions, the thickness of the valve plate at the connecting notch is greater the thickness thereof at the bursting notch, and the thickness of the valve plate at the connecting notch is less than the overall thickness of the valve plate. By means of the top cap assembly of the present application, when being opened, the valve plate can be prevented bursting into a plurality of fragments which are separated from the top cap assembly, thereby improving the safety and reliability of the top cap assembly during use.

Description

Top cover components, battery cells, batteries and electrical equipment

Cross-references to related applications

This application claims priority and benefit from the following patent applications, the entire contents of which are incorporated into this application by reference:

A Chinese patent application submitted to the State Intellectual Property Office of China on April 29, 2022, with application number 202221040732.

Technical field

This application relates to the field of battery technology, and specifically discloses a top cover assembly, battery cells, batteries and electrical equipment.

Background technique

At present, as environmental problems become increasingly prominent, people begin to actively advocate a low-carbon economy. New energy vehicles are on the rise as air quality becomes increasingly severe. The majority of manufacturers and consumers have also begun to gradually recognize hybrid vehicles and pure electric vehicles as representative new energy vehicles. As the main power source of new energy vehicles, power batteries have become one of the core components of electric vehicles.

In existing solutions, in order to ensure that the power battery has both high capacity and relatively good safety and cycle life, a valve plate is generally installed on the top cover of the power battery. When the power battery is subject to special conditions (such as thermal runaway and short circuit, etc.) Under the condition, the valve plate of the power battery can be opened in time to discharge the gas generated inside the power battery, thereby improving the safety of the power battery.

However, in actual use of the power battery, the entire valve plate is easily flushed open and multiple fragments are separated from the top cover plate. These fragments can also easily cause damage to other components and affect the safety of the power battery.

Contents of the invention

In view of the shortcomings of the existing technology, the present application provides a top cover assembly, battery cells, batteries and electrical equipment, which can alleviate the problem of multiple fragments formed from the top cover assembly when the valve is opened.

In a first aspect, this application provides a top cover assembly, including:

base;

Valve plate, the base ring is connected to the outer edge of the valve plate, the valve plate is provided with at least one connection score and at least one explosion score, the connection score is connected to the explosion score and Enclosed into at least two blasting areas, wherein the thickness dimension of the valve plate at the connection notch is greater than the thickness dimension of the valve plate at the explosion notch, and the thickness dimension of the valve plate at the connection notch is The thickness dimension of the valve plate is smaller than the overall thickness dimension of the valve plate.

In the technical solution of the present application, by setting the connection score and the blasting score, the connection score and the blasting score are connected and enclosed to form at least two blasting areas, where at least one blasting area includes the connection score, where the connection score is The thickness of the valve disc is greater than the thickness of the valve disc at the explosion notch. Therefore, when the valve disc is opened, the valve disc at the connection notch is less likely to break than the valve disc at the explosion notch. Therefore, when the valve disc is When opening, the blasting area is connected to the valve plate at the connection notch to prevent multiple fragments from being separated from the top cover assembly when the valve plate is opened. At the same time, in order to reduce the impact force on the valve plate at the connection notch when the valve plate is opened, prevent the connection The valve disc at the notch breaks, and the thickness of the valve disc connecting the notch is smaller than the overall thickness of the valve disc, so that the valve disc connecting the notch is more likely to bend and deform relative to the entire valve disc, and the valve disc is bent during bending. During the process of folding and deformation, the impact force on the blasting area is effectively reduced and the valve disc at the connection score is prevented from breaking. At the same time, the connection score is connected to the blasting score and enclosed to form at least two blasting areas to separate the valve disc. into at least two relatively small blasting areas, thereby reducing the impact force of the separated blasting areas, thereby further reducing the impact force borne by the valve disc at the connection notch, thereby ensuring that the blasting area and the valve disc at the connection notch are The connection reliability prevents multiple fragments from being separated from the top cover assembly when the valve plate is opened, and improves the safety and reliability of the top cover assembly when used.

In some embodiments, any of the blasting areas is provided with at least one connection score. By providing a connecting notch in any blasting area, when the valve plate is opened, any blasting area will be opened under the action of gas impact force and then connected to the valve plate at the connecting notch, thereby preventing any blasting area from being When the valve is opened, it separates from the top cover assembly and forms fragments.

In some embodiments, the connection score is a straight-line segment structure. Straight-line segment structures are more prone to bending and deformation than structures of other shapes, such as arc-shaped segments, thereby reducing the impact force on the valve disc at the connection notch and preventing the valve disc at the connection notch from breaking.

In some embodiments, the length of the connection score is greater than or equal to 4 mm. Such a setting can ensure that the valve disc at the connection notch has a certain connection strength, and can still be reliably connected to the blasting area even after bending and deformation, thereby preventing the valve disc at the connection notch from breaking, and thus preventing the valve disc from bursting. breaks away from the base and forms fragments.

In some embodiments, at least one of the connection scores includes a first connection score and a second connection score, and at least one of the blasting scores includes a first blasting score, a second blasting score, and a third blasting score. marks, wherein the first connection score, the first blasting score, the second connection score and the second blasting score are connected end to end in sequence, and the two ends of the third blasting score respectively connected to the first blasting score and the second blasting score. By connecting the first connection score, the first blasting score, the second connection score and the second blasting score end to end and enclosing the blasting area, at the same time, connect both ends of the third blasting score with the first blasting score respectively. The score is connected to the second blasting score, dividing the valve plate into two blasting areas, and both blasting areas contain connecting notches, which can effectively reduce the valve disc at the connecting notch in any blasting area. The impact it bears prevents the valve plate from breaking at the connection notch, and prevents any blasting area from breaking away from the top cover assembly and forming fragments.

In some embodiments, the valve plate is provided with n connection score lines and 2n-1 blasting score lines, where n is greater than or equal to 2, and n connection score lines and 2n-1 explosion score lines are provided. The blasting marks are enclosed into n blasting areas, and any of the blasting areas is a closed area enclosed by the connection mark and the blasting mark, and any of the blasting areas has one and only one The connection notch. The valve plate in this application is not limited to only including two blasting areas. In order to further reduce the impact force borne by any blasting area, the valve plate can also be divided into multiple blasting areas through the arrangement of connecting scores and blasting scores. area, any one of the corresponding multiple blasting areas contains a connection notch. After any blasting area is opened under the action of gas impact force, it is connected to the valve piece at the connection notch, thereby preventing any one The burst area breaks away from the top cover assembly and forms fragments when the valve plate is opened.

In some embodiments, the connection notches are spaced apart from the outer edge of the valve plate, and the blasting The notches are spaced apart from the outer edge of the valve plate. Since the base ring in this application is provided on the outer edge of the valve plate, by arranging the connection score at intervals from the outer edge of the valve plate, it is possible to avoid the connection score being provided at the connection between the valve plate and the base, thereby further improving Improve the connection strength of the valve plate at the connection notch. Since the blasting score is connected to the connection score and encloses the blasting area, the blasting score is also set to be spaced apart from the outer edge of the valve plate and connected to the connection score, so as to facilitate the opening of the blasting score on the valve plate. rupture.

In some embodiments, at least one reinforcement score is provided in any of the blasting areas, and both ends of the reinforcement score are respectively connected to the blasting score located at both ends of the connection score. By setting reinforced notches, the anti-deformation ability of the valve plate can be improved, so that during the handling and transportation of the top cover assembly, the valve plate will not be opened due to external pressure, and the valve plate will not be opened before the pressure in the battery is discharged. In this case, it loses its effect. At the same time, the two ends of the reinforcement score are connected to the blast score at both ends of the connection score, so that the connection score is located in the area surrounded by the reinforcement score and the blast score, which will not affect the connection strength of the connection score. cause impact.

In some embodiments, the thickness dimension of the valve plate is smaller than the thickness dimension of the base, and at least one surface of the valve plate is recessed relative to the surface of the base on the same side. The above structural design can ensure the connection strength between the base and other components on the top cover assembly. At the same time, the valve plate is more likely to rupture relative to the base. Therefore, when the gas inside the battery needs to be discharged, the explosion area of the valve plate can rupture and Open, and the valve plate is connected to other parts of the top cover assembly through the base.

In a second aspect, the present application provides a battery cell having the top cover assembly in the above embodiment.

In a third aspect, the present application provides a battery having the battery cell in the above embodiment.

In a fourth aspect, the present application provides an electrical device having the battery in the above embodiment.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of the drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and do not identify are limitations of this application. Also throughout the drawings, the same reference characters are used to designate the same components. In the attached picture:

Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a battery pack provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the present application;

Figure 4 is a schematic diagram of the exploded structure of a battery cell provided by an embodiment of the present application;

Figure 5 is a partial structural schematic diagram of a top cover assembly provided by an embodiment of the present application;

Figure 6 is an A-A cross-sectional view of the top cover assembly provided by an embodiment of the present application;

Figure 7 is an enlarged structural schematic diagram of part B of the top cover assembly provided by an embodiment of the present application;

Figure 8 is an enlarged structural schematic diagram of part C of the top cover assembly provided by an embodiment of the present application;

Figure 9 is an enlarged structural schematic diagram of part D of the top cover assembly provided by an embodiment of the present application;

Figure 10 is an enlarged structural schematic diagram of part E of the top cover assembly provided by an embodiment of the present application;

Figure 11 is a partial structural schematic diagram of a top cover assembly provided by an embodiment of the present application.

The reference numbers in the specific implementation are as follows:
1: Vehicle;
10: Battery, 11: Controller, 12: Motor;
20: Battery module, 21: Battery cell, 211: Case, 212: Electrode assembly;
30: Box, 301: First part, 302: Second part;
40: Top cover assembly, 40a: Electrode terminal;
41: base;
42: valve plate, 421: first blasting area, 422: second blasting area, 423: third blasting area;
431: first connection notch, 432: second connection notch, 433: third connection notch;
441: The first blasting mark, 442: The second blasting mark, 443: The third blasting mark, 444: The fourth blasting mark, 445: The fifth blasting mark;
451: First enhanced notch, 452: Second enhanced notch.

Detailed ways

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

It should be noted that, unless otherwise stated, the technical terms or scientific terms used in the embodiments of this application should have the usual meanings understood by those skilled in the art to which the embodiments of this application belong.

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear" , "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axis", "Diameter" The orientation or positional relationship indicated by "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, and does not indicate or imply the device or element referred to. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

In addition, technical terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

In the description of the embodiments of the present application, unless otherwise explicitly stipulated and limited, technical terms such as "installation", "connection", "connection", and "fixing" should be understood in a broad sense. For example, it can be a fixed connection, or a fixed connection. It can be detachably connected or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary; it can be the internal connection of two elements or the interaction of two elements. relation. 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 circumstances.

In the description of the embodiments of the present application, unless otherwise expressly stated and limited, a first feature "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features may be in direct contact. Indirect contact through intermediaries. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. No. A feature "below", "under" and "under" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

At present, judging from the development of the market situation, 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 are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding. In order to ensure that the power battery has both high capacity and relatively good safety and cycle life, a valve plate is generally installed on the top cover of the power battery. When the power battery is subject to special circumstances (such as thermal runaway and short circuit, etc.), the power battery's The valve can be opened in time to discharge the gas generated inside the power battery, thereby improving the safety of the power battery.

The inventor noticed that in the actual use of the power battery, the entire valve plate is easily completely flushed and forms multiple fragments separated from the top cover plate. The fragments separated from the top cover plate can easily cause damage to other components in the power battery. , affecting the safety of power batteries.

In order to solve the problem of the valve disc forming multiple fragments separated from the top cover assembly during the opening process, the applicant found that the valve disc is provided with a blast score area, and the thickness of the valve disc at the blast score area is smaller than the thickness of the valve disc body. size, so that the blasting score area is easier to break relative to other areas on the valve plate, thereby achieving the opening of the valve plate. However, fragments will form after the blasted area breaks away from the connection with the top cover assembly, and the fragments will affect or damage other components in the battery. Therefore, it is necessary to provide a connecting part for connecting the blasting area, and to prevent the blasting area from forming fragments separated from the top cover assembly, and the connecting part must have a certain impact resistance to prevent the connecting part from breaking when the valve plate is opened, causing the blasting area to Debris is formed that breaks away from the top cover assembly.

Based on the above considerations, in order to solve the problem of the valve plate forming multiple fragments separated from the top cover assembly during the opening process, the inventor designed a top cover assembly after in-depth research. By setting connection notches on the top cover assembly, The connection notch connects the blasting notch and the top cover assembly to prevent the explosion area from forming multiple fragments that are separated from the top cover assembly when the valve plate is opened. At the same time, in order to reduce the impact on the connection notch, the valve plate is divided into at least two More than one blasting area improves the connection reliability of the connection notch. When the valve plate is opened, since the valve plate is divided into multiple blasting areas, and at least part of the blasting areas are connected to the top cover assembly through the connection notch, the impact force on the valve disc at the connection notch can be reduced, causing explosion The area can still be connected to the valve plate at the connection notch after being opened, thereby reducing or avoiding the problem of multiple fragments being separated from the top cover assembly when the valve plate is opened.

The present application provides a top cover assembly, a battery including the top cover assembly, and electrical equipment using the battery. This top cover assembly is suitable for any battery, such as battery modules and battery packs, or primary batteries and secondary batteries. For example, secondary batteries include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, etc. Batteries, sodium-ion batteries, polymer batteries, etc. This kind of battery is suitable for various electrical devices that use batteries, such as mobile phones, portable devices, laptops, battery cars, electric toys, power tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include aircraft, rockets, aerospace Aircrafts and spacecrafts, etc.; batteries are used to provide electrical energy for the above electrical equipment.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following The above embodiments are all explained by taking an electric vehicle as an example.

Please refer to Figure 1 , which is a schematic structural diagram of a vehicle 1 provided by some embodiments of the present application. Vehicle 1 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. The battery 10 is disposed inside the vehicle 1 , and the battery 10 can be disposed at the bottom, head, or tail of the vehicle 1 . The battery 10 may be used to power the vehicle 1 , for example, the battery 10 may serve as an operating power source for the vehicle 1 . The vehicle 1 may also include a controller 11 and a motor 12 . The controller 11 is used to control the battery 10 to provide power to the motor 12 , for example, for starting, navigating, and driving the vehicle 1 to meet its power requirements.

In some embodiments of the present application, the battery 10 can not only be used as an operating power source of the vehicle 1 , but also can be used as a driving power source of the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

In order to meet different power requirements, the battery 10 may include multiple battery cells 21 , where the battery cells 21 refer to the smallest unit that constitutes the battery module 20 or the battery pack. Multiple battery cells 21 may be connected in series and/or in parallel via electrode terminals to be used in various applications. The battery mentioned in this application includes a battery module 20 or a battery pack. Among them, the plurality of battery cells 21 can be connected in series, in parallel, or in mixed connection. Mixed connection refers to a mixture of series connection and parallel connection. The battery 10 may also be referred to as a battery pack. In the embodiment of the present application, multiple battery cells 21 can directly form a battery pack, or they can first form a battery module 20, and then the battery module 20 can form a battery pack.

FIG. 2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. In Figure 2, battery 10 It may include a plurality of battery modules 20 and a case 30 , and the plurality of battery modules 20 are accommodated inside the case 30 . The box 30 is used to accommodate the battery cells 21 or the battery modules 20 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 21 . The box 30 may be a single cuboid, a simple three-dimensional structure such as a cylinder or a sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, a cylinder or a sphere. The embodiments of the present application are not limited to this. The material of the box body 30 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin. The embodiment of the present application is not limited to this.

In some embodiments, the box 30 may include a first part 301 and a second part 302. The first part 301 and the second part 302 cover each other. The first part 301 and the second part 302 jointly define a space for accommodating the battery cell 21. Space. The second part 302 may be a hollow structure with one end open, and the first part 301 may be a plate-like structure. The first part 301 covers the open side of the second part 302 so that the first part 301 and the second part 302 jointly define a space for accommodating the battery. The space of the unit 21; the first part 301 and the second part 302 may also be hollow structures with one side open, and the open side of the first part 301 is covered with the open side of the second part 302.

FIG. 3 shows a schematic structural diagram of a battery module 20 according to an embodiment of the present application. In Figure 3, the battery module 20 may include a plurality of battery cells 21. The plurality of battery cells 21 may first be connected in series, parallel or mixed to form the battery module 20. The plurality of battery modules 20 may then be connected in series, parallel or mixed to form the battery 40. . In the present application, the battery cell 21 may include a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiment of the present application is not limited thereto. The battery cell 21 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited thereto. Battery cells 21 are generally divided into three types according to packaging methods: cylindrical battery cells 21, rectangular battery cells 21 and soft-pack battery cells 21, and the embodiment of the present application is not limited to this. However, for the sake of simplicity of description, the following embodiments are all described by taking the rectangular battery cell 21 as an example.

FIG. 4 is a schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes the battery 10 . As shown in FIG. 4 , the battery cell 21 includes a top cover assembly 40 , a case 211 and an electrode assembly 212 .

The top cover assembly 40 refers to a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the top cover assembly 40 may be adapted to the shape of the housing 211 to fit the housing 211 . Alternatively, the top cover assembly 40 can be made of a material with certain hardness and strength (such as (aluminum alloy), in this way, the top cover assembly 40 is less likely to deform when subjected to extrusion and collision, so that the battery cell 21 can have higher structural strength, and the safety performance can also be improved. The top cover assembly 40 may be provided with functional components such as electrode terminals 40a. The electrode terminal 40a may be used to electrically connect with the electrode assembly 212 for outputting or inputting electric energy of the battery cell 21. In some embodiments, the top cover assembly 40 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member may also be provided inside the top cover assembly 40, and the insulating member may be used to isolate the electrical connection components in the housing 211 from the top cover assembly 40 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

The housing 211 is a component used to cooperate with the top cover assembly 40 to form an internal environment of the battery cell 21 , wherein the formed internal environment can be used to accommodate the electrode assembly 212 , electrolyte (not shown in the figure) and other components. . The housing 211 and the top cover assembly 40 may be independent components. An opening may be provided on the housing 211 and the top cover assembly 40 may cover the opening at the opening to form an internal environment of the battery cell 21 . Without limitation, the top cover assembly 40 and the housing 211 can also be integrated. Specifically, the top cover assembly 40 and the housing 211 can form a common connection surface before other components are put into the housing. When the housing 211 needs to be packaged, When inside, the top cover assembly 40 is allowed to cover the housing 211 . The housing 211 can be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 212 . The housing 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specifically limited in the embodiment of the present application.

The electrode assembly 212 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 212 may be contained within the housing 211 . The electrode assembly 212 is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and usually a separator is provided between the positive electrode sheets and the negative electrode sheets. The portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the electrode assembly 212, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material each constitute tabs (not shown in the figure). The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 40a to form a current loop.

In some embodiments of the present application, as shown in Figure 5, please further refer to Figures 6-40. The top cover assembly 40 includes a base 41 and a valve plate 42. The base 41 is connected to the outer edge of the valve plate 42. The valve plate 42 is provided with at least one connection score and at least one blast score. The connection score and blast score are The notches are connected and enclosed to form at least two blasting areas, in which the thickness of the valve plate 42 at the connecting notches is greater than that at the blasting notches. The thickness dimension of the valve plate 42 is smaller than the overall thickness dimension of the valve plate 42 at the connecting notch.

As shown in FIGS. 6 to 10 , in addition to the base 41 and the valve plate 42 , the top cover assembly 40 also includes a top cover plate (not marked in the figures). The base 41 may be a part of the top cover plate, or the base 41 may be connected to the top cover plate and used to support the valve plate 42 . The valve plate 42 can be a thin piece stamped from a metal sheet. The valve plate 42 is provided with connection scores and blasting scores. The connection scores and blasting scores are formed on the surface of the valve plate 42 by stamping. Specifically, the connection scores are The score can be provided on one side surface of the valve plate 42, or both sides of the valve plate 42. Similarly, the blasting score can be provided on one side surface of the valve plate 42, or both sides of the valve plate 42. surface on both sides.

The blasting area is an area where pressure relief can be performed when the valve plate 42 is opened, and is surrounded by connecting scores and blasting scores. Among them, the thickness dimension of the base 41 is T1, the overall thickness dimension of the valve plate 42 is T2, the thickness dimension of the valve plate 42 at the connection notch is T3, and the thickness dimension of the valve plate 42 at the blasting notch is T4. Specifically, the overall thickness dimension of the valve plate 42 is the thickness dimension of the valve plate 42 where no score is provided. The thickness dimension T3 of the valve plate 42 at the connection notch is greater than the thickness dimension T4 of the valve plate 12 at the explosion notch, that is, the depth dimension of the explosion notch stamping is greater than the depth dimension of the connection notch stamping, and the valve at the connection notch is The thickness dimension T3 of the plate 12 is smaller than the overall thickness dimension T2 of the valve plate 42, so in the thickness direction of the entire valve plate 42, the valve plate 42 at the blasting score is the thinnest. The thickness of the valve plate 42 at the connecting notch is between the overall thickness of the valve plate 42 and the thickness of the valve plate 42 at the blasting notch, thereby ensuring that the valve plate 42 at the connecting notch has a certain connection. Strength and a certain degree of bendability. When the gas pressure in the battery cell reaches the safety pressure relief threshold of the battery, the valve plate 42 at the explosion mark breaks, while the valve plate 42 at the connecting score is still connected to the base 41. The explosion area is affected by the impact of gas pressure. The lower connection notch is rotated and bent, and the impact force of the gas is reduced in the process. Finally, after the pressure relief is completed, the blasting area is still connected to the valve plate 41 at the connection notch.

It should be further explained that in some embodiments of the present application, the horizontal direction in FIG. 6 is the thickness direction of the valve plate 42 and the base 41 , that is, the direction perpendicular to the surfaces on both sides of the valve plate 42 is the valve plate 42 and the thickness direction of the base 41.

In the technical solution of the present application, by setting the connection score and the blasting score, the connection score and the blasting score are connected and enclosed to form at least two blasting areas, where at least one blasting area includes the connection score, where The thickness of the valve plate 42 at the connection notch is greater than the thickness of the valve plate 42 at the explosion notch, so that when the valve plate 42 is opened, the valve plate 42 at the connection notch is larger than the valve plate 42 at the explosion notch. It is less likely to break, so that when the valve plate 42 is opened, the bursting area is connected to the valve plate 42 at the connection notch, preventing multiple fragments from being separated from the top cover assembly 40 when the valve plate 42 is opened, and at the same time, in order to reduce the risk of the valve plate 42 opening The impact force on the valve plate 42 at the connection notch is to prevent the valve plate 42 at the connection notch from breaking. The thickness of the valve plate 42 at the connection notch is smaller than the overall thickness of the valve plate 42, thereby causing the connection notch to break. The valve plate 42 at the notch is easier to bend and deform than the valve plate 42 as a whole, and during the bending and deformation process, the impact force on the blasting area is effectively reduced, preventing the valve plate 42 connected to the notch from breaking. At the same time, The valve plate 42 is divided into at least two relatively small blasting areas by connecting the connecting notches to the blasting notches and enclosing them into at least two blasting areas, thereby reducing the impact force of the separated blasting areas and further reducing the impact of the connecting notches. The impact force borne by the valve plate 42 at the notch is ensured, thereby ensuring the reliability of the connection between the blasting area and the valve plate 42 at the connecting notch, preventing the valve plate 42 from forming multiple fragments separated from the top cover assembly 40 when it is opened, and improving the top cover. Safety and reliability of component 40 when used.

In some embodiments of the present application, as shown in Figures 5 and 11, any blasting area is provided with at least one connection score.

As shown in Figure 5, in some embodiments of the present application, the valve plate 42 includes a first burst area 421 and a second burst area 422, wherein the first burst area 421 includes a first connection score 431, and the second burst area 422 includes a second connecting score 432 .

When the valve plate 42 is opened, the first bursting area 421 is still connected to the valve plate 42 at the first connection notch 431 after opening under the action of the gas impact force, thereby preventing the first bursting area 421 from being separated when the valve plate 42 is opened. base 41 and form fragments. Similarly, the second blasting area 422 is still connected to the valve plate 42 at the second connection notch 432 after opening under the action of the gas impact force, thereby preventing the second blasting area 422 from breaking away from the base 41 when the valve plate 42 is opened. Form fragments.

As shown in Figure 11, in some embodiments of the present application, the valve plate 42 includes a first burst area 421, a second burst area 422, and a third burst area 423, wherein the first burst area 421 includes a first connection score. 431, the second blasting area 422 includes a second connection score 432, and the third blasting area 423 includes a third connection score 433.

By providing connection notches in any blasting area, when the valve plate 42 is opened, any blasting area The areas are respectively connected to the valve plates 42 at their corresponding connection notches, thereby preventing any blasting area from breaking away from the top cover assembly 40 and forming fragments when the valve plates 42 are opened.

In some embodiments of the present application, as shown in FIG. 5 , the connecting score is a straight-line segment structure.

Specifically, the connection scores and the blasting scores are integrally enclosed to form a racetrack-shaped structure, and the blasting area is located inside the racetrack-shaped structure. in. The racetrack-type structure includes two opposite straight segments and two opposite arc segments. The straight segments and the arc segments are alternately arranged and connected end to end, wherein the first connection score 431 and the second connection score 432 They are respectively arranged on the straight sections on both sides, and each has a straight section structure.

Straight-line segment structures are more prone to bending and deformation than structures of other shapes, such as arc-shaped segments, thereby reducing the impact force on the valve plate 42 at the connecting notch and preventing the valve plate 42 at the connecting notch from breaking.

In some embodiments of the present application, as shown in FIG. 5 , the length of the connection score is greater than or equal to 4 mm.

The length direction of the connecting score is the extension direction of the straight line segment in FIG. 5 , which is the horizontal direction in FIG. 5 . If in other embodiments of the present application, the connecting score is a straight segment and extends along the vertical direction, the length direction of the connecting score is the vertical direction.

Such an arrangement can ensure that the valve plate 42 at the connection notch has a certain connection strength, and can still be reliably connected to the blasting area even after bending and deformation, thereby preventing the valve plate 42 at the connection notch from breaking, thereby preventing the valve plate from breaking. 42 is opened to form multiple fragments separated from the top cover assembly 40 .

In some embodiments of the present application, as shown in FIG. 5 , at least one connection score includes a first connection score 431 and a second connection score 432 , and at least one explosion score includes a first explosion score 441 , a second connection score 432 . The blasting score 442 and the third blasting score 443, among which, the first connection score 431, the first blasting score 441, the second connection score 432 and the second blasting score 442 are connected end to end in sequence, and the third blasting score is Both ends of the mark 443 are connected to the first blasting score 441 and the second blasting score 442 respectively.

Specifically, the first connection score 431, the first blasting score 441, the second connection score 432 and the second blasting score 442 are connected end to end in sequence and enclose a blasting area. By setting the third blasting score 443, the blasting area will be The area is divided into a first bursting area 421 and a second bursting area 421, so that when the valve plate 42 is opened, the first bursting area 421 and the second bursting area 422 are respectively opened along the third bursting score 443. Among them, the first blasting area 421 is provided with a first connection score 431, and the second blasting area 422 is provided with a second connection score 432, so that the opened first blasting region 421 is connected to the valve plate at the first connection score 431. 42 connected, open The opened second blasting area 422 is connected to the valve plate 42 at the second connecting notch 432 .

By connecting the first connection score 431, the first blasting score 441, the second connection score 432 and the second blasting score 442 end to end and enclosing the blasting area, at the same time, the two ends of the third blasting score 443 are Connected to the first blasting score 441 and the second blasting score 442 respectively, the valve plate 42 is divided into two blasting areas, and both blasting areas include connection scores, thereby effectively reducing the risk in any blasting area. The impact suffered by the valve plate 42 at the connection notch prevents the valve plate 42 at the connection notch from breaking, and prevents any blasting area from breaking away from the top cover assembly 40 and forming fragments.

In some embodiments of the present application, as shown in Figures 5 and 11, the valve plate 42 is provided with n connection scores and 2n-1 blasting scores, where n is greater than or equal to 2, and n connection scores are provided. and 2n-1 blasting notches to form n blasting areas. Any blasting area is a closed area surrounded by connecting notches and blasting notches, and any blasting area has one and only one connecting notch.

As shown in Figure 5, when n is equal to 2, the valve plate 42 is provided with two connection notches, namely the first connection notch 431 and the second connection notch 432. At the same time, the valve plate 42 is also provided with three blasting holes. Scores, namely the first blasting score 441, the second blasting score 442 and the third blasting score 443, the first connection score 431, the second connection score 432, the first blasting score 441, the second blasting score The mark 442 and the third blasting notch 443 enclose two blasting areas, namely the first blasting area 421 and the second blasting area 422. The first blasting area 421 is provided with a first connecting notch 421, and the second blasting area 422 A second connection notch 422 is provided.

As shown in Figure 11, when n is equal to 3, there are three connection notches on the valve plate 42, namely the first connection notch 431, the second connection notch 432 and the third connection notch 433. There are also 5 blasting scores, namely the first blasting score 441, the second blasting score 442, the third blasting score 443, the fourth blasting score 444 and the fifth blasting score 445, and 3 connecting scores. and five blasting notches to form three blasting areas, namely the first blasting area 421, the second blasting area 422 and the third blasting area 423. The first blasting area 421 is provided with a first connecting notch 431, and the second blasting area 421 is provided with a first connecting notch 431. The blasting area 422 is provided with a second connection score 432 , and the third blasting area 423 is provided with a third connection score 433 .

Sequentially, when n is equal to 4, four connection notches are provided on the valve plate 42. Compared with the case where n is equal to 3, an extra connection notch can be provided in the straight line segment where the first connection notch 431 is located or In the straight section where the second connecting notch 432 is located, two blasting notches are correspondingly added, one of which is used to connect the adjacent connecting notches, and the other is used to connect the third blasting notch 443 , or other blasting moments marks and form a closed structure. By analogy, n connection notches and 2n-1 explosion notches can be set, thereby dividing the valve plate 4 into n explosion areas, and any explosion area is provided with a connection notch.

The valve plate 42 in this application is not limited to only include two blasting areas. In order to further reduce the impact force borne by any blasting area, the valve plate 42 can also be divided into multiple blasting areas through the arrangement of connecting scores and blasting scores. Each blasting area contains a connecting notch. Each blasting area is opened under the action of the gas impact force and is connected to the valve plate 42 at the connecting notch. Then, This prevents any bursting area from breaking away from the top cover assembly 40 and forming fragments when the valve plate 42 is opened.

In some embodiments of the present application, as shown in FIGS. 5 to 7 , the connection score is spaced from the outer edge of the valve plate 42 , and the blasting score is spaced from the outer edge of the valve plate 42 .

The outer edge of the valve plate 42 is the connection point between the valve plate 42 and the base 41 . Since the base 41 in this application is arranged around the outer edge of the valve plate 42, by arranging the connection score at intervals from the outer edge of the valve plate 42, it is possible to avoid providing the connection score at the connection between the valve plate 42 and the base 41. , thereby further improving the connection strength of the valve plate 42 at the connection notch. Since the blasting score is connected to the connection score and forms a blasting area, the blasting score is also set to be spaced apart from the outer edge of the valve plate 42 and connected to the connection score, thereby facilitating the placement of the blasting score on the valve plate. 42 is broken when opened.

In some embodiments of the present application, as shown in Figure 5, at least one reinforcement score is provided in any blasting area, and the two ends of the reinforcement score are respectively connected to the blasting score located at both ends of the connecting score.

Reinforcing notches can also be formed on the surface of the valve plate 42 by stamping, thereby improving the deformation resistance of the valve plate 42 . In some embodiments of the present application, the reinforced score includes a first reinforced score 451 and a second reinforced score 452, wherein the first reinforced score 451 is provided in the first blasting area 421, and the second reinforced score 452 is provided in the first blasting area 421. Second blasting area 422. Both the first reinforced score 451 and the second reinforced score 452 are similar to arc-shaped structures. The two ends of the arc-shaped structure of the first reinforced score 451 are respectively connected with the first blasting score 441 at both ends of the first connection score 431. Connected to the second blasting score 442, the arc-shaped protrusions of the arc-shaped structure of the first reinforced score 451 are disposed close to the protrusions of the third blasting score 443, and both ends of the arc-shaped structure of the second reinforced score 452 They are respectively connected to the first blasting score 441 and the second blasting score 442 at both ends of the second connection score 432. The arc-shaped protrusion of the arc-shaped structure of the second reinforcement score 452 is close to the third blasting score 443 protrusion. set up.

By setting reinforced notches, the deformation resistance of the valve plate 42 can be improved, so that during the handling and transportation of the top cover assembly 40, the valve plate 42 will not be opened due to external pressure, preventing the valve plate from being opened before the battery is discharged. In case of internal pressure, it loses its function. At the same time, the two ends of the reinforcement score are connected to the blast score at both ends of the connection score, so that the connection score is located in the area surrounded by the reinforcement score and the blast score, and the connection strength of the connection score will not cause Influence.

In some embodiments of the present application, as shown in FIGS. 5 and 6 , the overall thickness of the valve plate 42 is smaller than the thickness of the base 41 , and at least one surface of the valve plate 42 is relative to the thickness of the base 41 on the same side. Surface depression settings.

Specifically, the overall thickness of the valve plate 42 is T2, the thickness of the base 41 is T1, and T2 is smaller than T1. One side surface of the valve plate 42 is flush with one side surface of the base 41 , and the other side surface of the valve plate 42 is recessed relative to the other side surface of the base 41 . In other embodiments of the present application, both side surfaces of the valve plate 42 can also be recessed relative to both side surfaces of the base 41 .

The above structural design can ensure the connection strength between the base 41 and other components on the top cover assembly 40. At the same time, the valve plate 42 is more likely to break or deform relative to the base 41. Therefore, when the gas inside the battery needs to be discharged, the valve plate 42 The blasting notched area is ruptured and opened to release pressure, and the opened blasting area is fixed on the base 41 through the valve plate 42 connected to the notched area.

According to some embodiments of the present application, the present application provides a battery cell 21 having the top cover assembly 40 in any of the above embodiments.

According to some embodiments of the present application, the present application provides a battery 10 having the battery cell 21 of any of the above embodiments.

According to some embodiments of the present application, the present application provides an electrical device, which has the battery 10 of any of the above embodiments, and the battery 10 is used to provide electrical energy to the electrical device.

The power-consuming device may be any of the aforementioned devices or systems using batteries.

According to some embodiments of the present application, as shown in FIGS. 5 to 10 , the top cover assembly 40 includes a base 41 and a valve plate 42 , wherein the valve plate 42 is provided with a first connection score 431 and a second connection score 432 , the first blasting score 441, the second blasting score 442 and the third blasting score 443, the first connection score 431, the second connection score 432, the first blasting score 441 and the second blasting score 442 and The blasting area is surrounded, and the valve plate 42 is divided into a first blasting area 421 and a second blasting area through the arrangement of the third blasting score 443 In the domain 422, the first blasting area 421 is provided with a first connection score 431, and the second blasting area 422 is provided with a second connection score 432. The thickness dimension of the valve plate 42 at the first connection notch 431 and the thickness dimension of the valve plate 42 at the second connection notch 432 are both T3. The overall thickness dimension of the valve plate 42 is T2. The valve plate 42 at the first blasting notch 441 The thickness dimension of the plate 42, the thickness dimension of the valve plate 42 at the second explosion score 442 and the thickness dimension of the valve disk 42 at the third explosion score 443 are the same as T4, where T3 is greater than T4, and T3 is less than T2. When the gas pressure in the battery reaches the safety pressure relief threshold of the battery, the valve plate 42 at the first burst mark 441, the second burst mark 442, and the third burst mark 443 all break, and the first burst area 421 is The second blasting area 422 rotates and bends around the second connection notch 432 under the impact of gas pressure, and the impact force of the gas is reduced in the process. , and finally after the pressure relief is completed, the first bursting area 421 is connected to the valve plate 42 at the first connection notch 431, and the second bursting area 422 is connected to the valve plate 42 at the second connection notch 432, thereby preventing the second A blast zone 421 and a second blast zone 422 break away from the top cover assembly 40 and form fragments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or to make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. The scope shall be covered by the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (12)

1. A top cover assembly, characterized by including:

   base;

   Valve plate, the base ring is connected to the outer edge of the valve plate, the valve plate is provided with at least one connection score and at least one explosion score, the connection score is connected to the explosion score and Enclosed into at least two blasting areas, wherein the thickness dimension of the valve plate at the connection notch is greater than the thickness dimension of the valve plate at the explosion notch, and the thickness dimension of the valve plate at the connection notch is The thickness dimension of the valve plate is smaller than the overall thickness dimension of the valve plate.
2. The top cover assembly according to claim 1, wherein any of the blasting areas is provided with at least one connection score.
3. The top cover assembly according to claim 2, wherein the connection score is a straight-line segment structure.
4. The top cover assembly according to claim 3, wherein the length of the connection notch is greater than or equal to 4 mm.
5. The top cover assembly according to any one of claims 2 to 4, wherein at least one of the connection scores includes a first connection score and a second connection score, and at least one of the blasting scores includes a third connection score. A blasting score, a second blasting score and a third blasting score, wherein the first connection score, the first blasting score, the second connection score and the second blasting score Connected end to end, the two ends of the third blasting score are connected to the first blasting score and the second blasting score respectively.
6. The top cover assembly according to any one of claims 2 to 4, characterized in that the valve plate is provided with n connection scores and 2n-1 blasting scores, wherein n is greater than or equal to 2. The n connection scores and the 2n-1 blasting scores are surrounded by n blasting areas, and any blasting area is formed by the connection scores and the blasting marks. A closed area, and any blasting area has only one connecting score.
7. The top cover assembly according to any one of claims 1 to 6, characterized in that the connection score is spaced from the outer edge of the valve plate, and the blasting score is spaced from the outer edge of the valve plate. Interval settings.
8. The top cover assembly according to any one of claims 1 to 6, characterized in that at least one reinforcement score is provided in any of the blasting areas, and both ends of the reinforcement score are respectively connected with each other. The two ends of the connection score are connected to the blasting score.
9. The top cover assembly according to any one of claims 1 to 6, wherein the overall thickness of the valve plate is smaller than the thickness of the base, and at least one surface of the valve plate is relative to the same thickness. The surface of the base on one side is recessed.
10. A battery cell, characterized by having a top cover assembly according to any one of claims 1 to 9.
11. A battery characterized by having the battery cell according to claim 10.
12. An electrical device, characterized by having the battery according to claim 11.