Battery device, power utilization device and energy storage device

Abstract

The utility model provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a box body assembly, a plurality of battery cells and a separator, the box body assembly comprises a body and a plate body, at least one end of the body is open, the plate body is located at the opening of the body and connected with the body, and the plate body and the interior of the body define a containing space; the plurality of battery monomers are arranged in the accommodating space, the separator is arranged on one side, far away from the battery monomers, of the plate body, the plate body is provided with a plurality of channels penetrating along the thickness direction, and the plurality of channels are in one-to-one correspondence with the explosion-proof valves of the plurality of battery monomers; the isolation piece comprises a plurality of weak sealing structures, the weak sealing structures correspond to the channels one to one, and the channels communicate with the corresponding anti-explosion valves and the weak sealing structures. The battery device provided by the utility model can improve the exhaust efficiency of the battery monomers while improving the thermal runaway problem of the battery device.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device, an electrical device, and an energy storage device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing energy or releasing energy according to needs, and thus are widely used in various electrical devices or energy storage systems, and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor related to its development.

[0003] A battery device usually includes a plurality of battery cells, and an explosion-proof valve is usually provided on the surface of the battery cell. When an abnormal situation occurs inside the battery cell, such as an abnormal increase in pressure or temperature, causing the internal air pressure of the battery cell to increase to a certain threshold, the explosion-proof valve can automatically open to relieve pressure, thereby reducing the risk of explosion caused by excessive internal pressure of the battery cell.

[0004] However, during the process of the battery cell relieving pressure by opening the valve, there are problems of low exhaust efficiency, and the ejecta discharged from the inside of the battery cell are likely to cause thermal effects on the surrounding battery cells, thereby triggering thermal runaway and thermal diffusion. Summary of the Utility Model

[0005] This application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of this application is to provide a battery device, an electrical device, and an energy storage device, so as to improve the problem of thermal runaway of the battery device while enhancing the exhaust efficiency of the battery cell.

[0006] An embodiment of the first aspect of this application provides a battery device, including a box body assembly, a plurality of battery cells, and a separator. The box body assembly includes a body and a plate body. At least one end of the body is open, the plate body is located at the opening of the body and is connected to the body, and the plate body and the body enclose an accommodation space inside; a plurality of battery cells are arranged in the accommodation space; the separator is arranged on the side of the plate body away from the battery cells; the plate body has a plurality of channels penetrating in the thickness direction, and the plurality of channels correspond to the explosion-proof valves of the plurality of battery cells one by one; the separator includes a plurality of weak closed structures, the plurality of weak closed structures correspond to the plurality of channels one by one, and the channels communicate with the explosion-proof valves and the weak closed structures corresponding to them.

[0007] In the technical solution of the embodiment of the present application, when the internal pressure of the battery cell is too high, the explosion-proof valve opens, and the ejecta discharged from the inside of the battery cell can flow through the channel of the plate body to the weak closed structure on the separator. The weak closed structure ruptures under the action of pressure, playing a role in pressure relief and protection. The weak closed structures corresponding to the remaining normal battery cells remain closed, protecting the normal battery cells, and can improve the problem that the ejecta discharged from the abnormal battery cell causes thermal influence on the surrounding normal battery cells and triggers thermal runaway of the surrounding normal battery cells. Moreover, a channel is also provided on the plate body between the explosion-proof valve and the weak closed structure. The ejecta ejected from the inside of the battery cell can first accumulate in the channel. When the pressure in the channel reaches a certain threshold, it is easier to break through the corresponding weak closed structure, so that the ejecta inside the battery cell can be discharged smoothly, and thus while improving the problem of thermal runaway of the battery device, the exhaust efficiency of the battery cell can be improved.

[0008] In some embodiments, the explosion-proof valve is arranged at the bottom of the battery cell. When thermal runaway occurs in the battery cell, compared with the ejecta being discharged from the top of the battery cell, the ejecta being discharged from the bottom of the battery cell can further improve the problem that the ejecta falls under the action of gravity and causes thermal runaway of the surrounding battery cells. Moreover, even if the ejecta discharged from the bottom of the battery cell may bounce back to the surrounding battery cells due to the influence of other structures in the battery device, since the separator is provided at the bottom of the surrounding battery cells, the bounced-back ejecta is not easy to break through the separator, and thus the thermal influence of the ejecta on the surrounding battery cells can be reduced, and the possibility of thermal runaway can be reduced.

[0009] In some embodiments, the battery device further includes: a protection plate, which is located on the side of the plate body away from the battery cell and is connected to the main body. The protection plate, the main body, and the plate body enclose a cavity, and the separator is arranged in the cavity. The protection plate protects the separator, the battery cells and the circuit inside the accommodation space. Since a separator is provided between the plate body and the protection plate, the discharged ejecta will not cause a large thermal influence on the surrounding battery cells even if it is rebounded by the protection plate, reducing the possibility of thermal runaway of the battery device.

[0010] In some embodiments, the channel has opposite first and second openings. The edge of the first opening coincides with the edge of the explosion-proof valve, and the second opening exposes the weak closed structure. In this way, it is beneficial for the ejecta discharged from the explosion-proof valve to accurately enter the channel through the first opening and be discharged from the second opening to break through the weak closed structure for pressure relief, reducing the problem of accidental impact and damage to the surrounding battery cells due to deviation of the pressure relief direction, and further improving the problem of thermal runaway of the battery device.

[0011] In some embodiments, the edge of the second opening coincides with the edge of the weak sealing structure. That is, the second opening is exactly dimensionally matched with the weak sealing structure, such that the size of the second opening is not too large compared to the size of the weak sealing structure. When the pressure of the ejecta discharged from the explosion-proof valve remains constant, it can increase the impact force of the ejecta on the weak sealing structure, improve the rate and success rate of the ejecta breaking through the weak sealing structure, and also enable the ejecta discharged from the second opening to quickly pass through the weak sealing structure and be discharged, reducing the thermal impact on other battery cells, improving the pressure relief efficiency, and reducing the risk of explosion caused by excessive pressure inside the battery cell.

[0012] In some embodiments, the weak sealing structure includes a first surface and a second surface opposite to each other in the thickness direction, and the first surface includes at least one groove. Since the thickness of the area of the weak sealing structure provided with the groove is smaller than the thickness of the area of the weak sealing structure without the groove, it makes it easier for the ejecta to break through the groove on the weak sealing structure, that is, to break through the weak sealing structure, thereby timely discharging the ejecta inside the battery cell and reducing the risk of thermal runaway of the battery cell.

[0013] In some embodiments, the number of grooves is multiple, and the multiple grooves are arranged at intervals along the circumferential direction of the weak sealing structure. The ejecta can exert an impact force on the multiple grooves arranged in the circumferential direction of the weak sealing structure, thereby forming an opening with a larger area for the ejecta to be discharged, and improving the pressure relief efficiency of the battery device.

[0014] In some embodiments, the number of grooves is one, and the groove extends along the circumferential direction of the weak sealing structure. The proportion of the area of the groove on the first surface is relatively large, such that after the ejecta breaks through the weak sealing structure, it can form an opening with a larger area for pressure relief, improving the pressure relief efficiency of the battery device.

[0015] In some embodiments, the first surface faces the channel. Thus, the surface of the weak sealing structure provided with the groove faces the explosion-proof valve of the battery cell, such that the surface of the weak sealing structure provided with the groove faces the ejecta directly, improving the impact force and breaking-through efficiency of the ejecta on the groove, and further improving the exhaust efficiency of the battery device.

[0016] In some embodiments, the second surface is a plane. After the ejecta is discharged from the battery cell in thermal runaway, even if the ejecta rebounds, the rebounded ejecta will fall back to the second surface. Since the second surface is a plane, compared with the case where the second surface is provided with grooves, it makes the second surface less likely to be penetrated by the ejecta, thereby improving the protection ability for surrounding normal battery cells.

[0017] In some embodiments, the channel has opposite first and second openings. The first opening exposes the explosion-proof valve, and the second opening exposes the weak sealing structure. The groove is arranged along the circumferential direction of the second opening. After the ejecta is discharged from the second opening, it can impact the groove along the circumferential direction of the second opening, which is beneficial to break the weak sealing structure, so as to achieve timely and effective pressure relief and temperature reduction, thereby reducing the possibility of explosion of the battery cell due to high internal pressure and high temperature.

[0018] In some embodiments, the thickness of the weak sealing structure is less than the thickness of other regions of the separator except the weak sealing structure. That is, the thickness of the entire weak sealing structure is thinned, so that the weak sealing structure is likely to break as a whole under the impact of the ejecta, thereby providing a larger opening for the ejecta ejected from the inside of the battery cell to achieve pressure relief and further improving the exhaust efficiency.

[0019] In some embodiments, the separator is a mica sheet. Since the mica sheet has good heat resistance and flame retardant properties, it can protect the battery cell and further reduce the possibility of other battery cells experiencing thermal runaway after the battery cell undergoes thermal runaway.

[0020] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery device in the above embodiments, and the battery device is used to provide electrical energy.

[0021] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery device in the above embodiments, and the battery device is used to store electrical energy.

[0022] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 It is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0025] Figure 2 It is a schematic exploded view of a battery cell according to some embodiments of the present application;

[0026] Figure 3Schematic diagram of the partial structure of the battery device according to some embodiments of the present application;

[0027] Figure 4 Schematic diagram of the structure of the separator according to some embodiments of the present application;

[0028] Figure 5 Is Figure 3 One of the partial enlarged views at the dashed line in

[0029] Figure 6 Is Figure 3 Another partial enlarged view at the dashed line in

[0030] Figure 7 Partial exploded view of the battery device according to other embodiments of the present application;

[0031] Figure 8 Top view structural schematic diagram of the battery device according to other embodiments of the present application;

[0032] Figure 9 Is Figure 8 Cross-sectional view in the A-A direction in

[0033] Figure 10 Is Figure 9 Enlarged view at the dashed line in

[0034] Explanation of reference numerals:

[0035] Vehicle 1000;

[0036] Battery 100;

[0037] Controller 200;

[0038] Motor 300;

[0039] Groove 411;

[0040] Battery cell 20, explosion-proof valve 20a, end cap 21, electrode terminal 21a, housing 22, electrode assembly 23, tab 23a;

[0041] Plate body 30, channel 31;

[0042] Separator 40, weak closed structure 41;

[0043] Body 51, guard plate 52, cavity 52a, accommodation space 50a. Detailed implementation manners

[0044] 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, so they are only examples and cannot be used to limit the protection scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0049] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0050] In the description of the embodiments of this 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", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, technical terms such as "installation", "connection", "attachment", and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. 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.

[0052] Currently, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in various electronic devices, such as electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also continuously increasing.

[0053] A battery device generally includes a plurality of battery cells, and an explosion-proof valve is usually provided at one end of the plurality of battery cells. In some cases, when abnormal conditions occur inside the battery cell, such as abnormal increase in internal pressure or temperature, etc., it will cause the internal pressure of the battery cell to increase. When the pressure increases to a certain threshold, the explosion-proof valve can automatically open the valve to relieve pressure under the action of the pressure, thereby reducing the risk of explosion caused by excessive internal pressure of the battery cell.

[0054] However, during the process of the battery cell relieving pressure by opening the valve, the ejecta discharged from the inside of the battery cell, such as gas or particles, etc., are likely to transfer heat to the surrounding battery cells through the action of heat radiation or heat conduction, thereby causing a thermal impact on the surrounding battery cells and leading to the problem of thermal runaway of the surrounding battery cells. Even in some cases, the ejecta may damage the explosion-proof valves of the surrounding battery cells, further exacerbating the problems of thermal runaway and thermal diffusion and affecting the safety of the battery device.

[0055] Based on the above considerations, a battery device is designed, which includes a box body assembly, a plurality of battery cells, and a separator. The box body assembly includes a body and a plate body. At least one end of the body is open, the plate body is located at the opening of the body and is connected to the body, and the plate body and the body enclose an accommodation space inside; a plurality of battery cells are arranged in the accommodation space; the separator is arranged on the side of the plate body away from the battery cells; the plate body has a plurality of channels penetrating along the thickness direction, and the plurality of channels correspond to the explosion-proof valves of the plurality of battery cells one by one; the separator includes a plurality of weak closed structures, and the plurality of weak closed structures correspond to the plurality of channels one by one, and the channels communicate with the explosion-proof valves and the weak closed structures corresponding to them.

[0056] When the internal pressure of a battery cell is too high, the explosion-proof valve opens, and the ejecta discharged from the inside of the battery cell can flow through the channel of the plate body to the weak closed structure on the separator. The weak closed structure ruptures under the action of pressure, playing a role in pressure relief and protection. The weak closed structures corresponding to the remaining normal battery cells remain closed, protecting the normal battery cells, and can improve the problem that the ejecta discharged from the inside of the abnormal battery cell causes thermal influence on the surrounding normal battery cells and triggers thermal runaway of the surrounding normal battery cells. Moreover, a channel is also provided on the plate body between the explosion-proof valve and the weak closed structure. The ejecta ejected from the inside of the battery cell can first accumulate in the channel. When the pressure in the channel reaches a certain threshold, it is easier to break through the corresponding weak closed structure, so that the ejecta inside the battery cell can be discharged smoothly, and thus while improving the problem of thermal runaway of the battery device, the exhaust efficiency of the battery cell can be enhanced.

[0057] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices or energy storage devices such as vehicles, ships or aircrafts, etc. The power system of the power-consuming device or the energy storage device can be composed of the battery device disclosed in the present application.

[0058] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecrafts, etc. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, electric aircraft toys, etc., and the spacecrafts can include airplanes, rockets, space shuttles, spaceships, etc.

[0059] The embodiments of the present application also provide an energy storage device using a battery as a power source. The energy storage device can be but is not limited to energy storage containers, energy storage cabinets, energy storage power stations, energy storage battery packs or portable energy storage systems, etc.

[0060] For the convenience of description, the following embodiments take a power-consuming device of a vehicle 1000 in an embodiment of the present application as an example for description.

[0061] Please refer to Figure 1 , Figure 1Schematic structural diagram of a vehicle provided for some embodiments of the present application. The vehicle 1000 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 vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0062] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Figure 2 Schematic structural diagram of a battery cell for some embodiments of the present application, Figure 3 Partial schematic structural diagram of a battery device for some embodiments of the present application, Figure 4 Schematic structural diagram of a separator for some embodiments of the present application, Figure 5 is Figure 3 One of the partial enlarged views at the dashed line in Figure 6 is Figure 3 The second partial enlarged view at the dashed line in Figures 2 to 6 Referring to

[0064] A battery cell 20 refers to the smallest unit that makes up a battery. A plurality of battery cells 20 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among a plurality of battery cells 20. Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0065] In some embodiments, the battery device may further include a busbar component for achieving electrical connection between multiple battery cells 20.

[0066] The battery cell 20 may further include an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0067] The end cap 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment.

[0068] In some embodiments, an explosion-proof valve may be provided on the end cap 21 for discharging the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The end cap 21 may be located at the top of the battery cell 20.

[0069] In some other embodiments, the explosion-proof valve may also be provided at the bottom of the battery cell 20.

[0070] In some embodiments, the explosion-proof valve may be a split structure. That is to say, the explosion-proof valve may include a valve body and a seal located in the valve body. When the pressure inside the battery cell 20 rises and reaches the threshold value, the seal will deform, rupture or open under the action of the pressure to form an opening, thereby releasing the ejecta inside the battery cell 20. The ejecta may include some flammable gases, harmful gases, electrolyte, metal particles, etc. In some embodiments, the shape of the valve body includes but is not limited to cylindrical, cubic, etc.

[0071] In some other embodiments, the explosion-proof valve may also be an integral structure. The explosion-proof valve may be integrally formed with the housing 22. For example, the explosion-proof valve may be a weakened position formed by thinning the housing 22. When the pressure inside the battery cell 20 rises and reaches the threshold value, it makes the ejecta inside the battery cell 20 easily break through the explosion-proof valve to form an opening channel, thereby relieving the pressure.

[0072] In some embodiments, an insulating member may also be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components inside the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0073] The housing 22 is a component for cooperating with the end cap 21 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components.

[0074] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 can be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 23, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 23a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 23a are connected to the electrode terminals 21a to form a current loop.

[0075] In some embodiments, the body 51 can have openings at both ends, and the plate body 30 is located at one of the openings of the body 51. Exemplarily, the body 51 can be a frame, and the plate body 30 can be located at the top opening of the body 51 or at the bottom opening of the body 51. When the plate body 30 is located at the top opening of the body 51, the bottom opening of the body 51 can have a bottom plate, and the bottom plate is connected to the body 51 to close the bottom opening of the body. When the plate body 30 is located at the bottom opening of the body 51, the body 51 can serve as the bottom plate, and the top opening of the body 51 can have a cover plate, and the cover plate is connected to the body 51 to close the top opening of the body 51.

[0076] It should be noted that when the plate body 30 is located at the top opening of the body 51, the top of the battery cell has an explosion-proof valve, and the channel 31 in the plate body 30 is correspondingly arranged with the explosion-proof valve at the top of the battery cell. When the plate body 30 is located at the bottom opening of the body 51, the bottom of the battery cell has an explosion-proof valve, and the channel 31 in the plate body 30 is correspondingly arranged with the explosion-proof valve at the bottom of the battery cell.

[0077] In some other embodiments, the body 51 can also have an opening at one end, and the other end of the body 51 opposite to the opening is a closed structure. Exemplarily, the body 51 can have a bottom opening or a top opening, and the plate body 30 is located at the bottom opening or the top opening of the body 51.

[0078] In some embodiments, the shape of the box assembly formed by the body 51 and the plate body 30 includes but is not limited to a cylinder, a cuboid, etc. In some embodiments, the composition material of the plate body 30 can include but is not limited to aluminum alloy or carbon fiber composite material. In this way, the plate body 30 has sufficient strength so that the channel 31 of the plate body 30 is not easily deformed under the action of the ejecta.

[0079] In some embodiments, the outer periphery of the plate body 30 can be fixedly connected to the body 51. The connection methods of the fixed connection include but are not limited to threaded connection, welding connection, bonding connection, etc.

[0080] In some other embodiments, the plate body 30 and the main body 51 can also be integrally formed.

[0081] The plurality of battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel manner, and then the whole formed by the plurality of battery cells 20 is accommodated in the accommodation space 50a; of course, the battery 100 can also be in a form where the plurality of battery cells 20 are first connected in series, in parallel, or in a combined series-parallel manner to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a combined series-parallel manner to form a whole and are accommodated in the accommodation space 50a.

[0082] The position of the plate body 30 other than the channels 31 is in contact with one end of the plurality of battery cells 20 provided with explosion-proof valves. The channels 31 expose the explosion-proof valves of the battery cells 20. In some embodiments, the plate body 30 can be adhesively connected to one end of the plurality of battery cells 20 provided with explosion-proof valves. In some other embodiments, when the explosion-proof valves are located at the bottom of the battery cells 20, the plate body 30 can play a role in supporting the battery cells 20, and the battery cells 20 are in contact with the plate body 30 under the action of their own gravity.

[0083] Reference Figure 3 , in some embodiments, the plurality of channels 31 provided on the plate body 30 can be arranged in an array, for example, they can be arranged in multiple rows and multiple columns. Among them, each row of channels 31 can be spaced along the length direction of the plate body 30, and each column of channels 31 can be spaced along the width direction of the plate body 30. Reference Figure 8 , the arrangement mode of the plurality of battery cells 20 is the same as that of the plurality of channels 31, so that the plurality of channels 31 are arranged in one-to-one correspondence with the explosion-proof valves of the plurality of battery cells 20.

[0084] In some embodiments, the channel 31 has two opposite openings, the two openings face each other, the sizes of the two openings are equal and the shapes of the two openings are the same. Along the thickness direction of the plate body 30, the size of the channel 31 can remain unchanged. The thickness direction of the plate body 30 is the direction from the battery cell 20 to the plate body 30.

[0085] In some embodiments, the cross-sectional dimensions and cross-sectional shapes of the plurality of channels 31 can be the same.

[0086] In some embodiments, the cross-sectional shape of the channel 31 includes but is not limited to a circle, an ellipse, a square, etc.

[0087] The separator 40 is in contact with the plate body 30. In some embodiments, the plate body 30 can be adhesively connected to the separator 40.

[0088] In some embodiments, when the channels 31 of the plate body 30 are arranged in an array, the separator 40 may include a plurality of strip-shaped sub-separators. The number of the plurality of sub-separators is the same as the number of rows of the plurality of channels 31, and each sub-separator is correspondingly arranged with each column of channels 31. Each sub-separator may include the same number of weak closed structures 41, and the number of the weak closed structures 41 of each sub-separator is the same as the number of channels 31 in each column of channels 31. In this way, the plurality of channels 31 and the plurality of weak closed structures 41 are arranged in one-to-one correspondence.

[0089] The weak closed structure 41 refers to a closed structure with a weak point. In other words, the weak closed structure can be preferentially opened or broken under the action of the ejecta discharged inside the battery cell 20. In the normal state of the battery cell 20, or in the state where no ejecta is ejected, it is in a closed state. The closed structure means that the weak closed structure 41 has no opening or gap.

[0090] In some embodiments, the maximum thickness of the weak closed structure 41 is less than the minimum thickness of other regions of the separator 40 except the weak closed structure 41, so that when the battery cell 20 undergoes thermal runaway, the ejecta can more easily break through the weak closed structure 41 to relieve pressure. In other embodiments, the material strength of the weak closed structure 41 can be less than the material strength of other regions of the separator 40 except the weak closed structure 41, so that the weak closed structure 41 is more likely to deform or break under pressure, thereby relieving pressure.

[0091] That the channel 31 communicates with the corresponding explosion-proof valve and the weak closed structure 41 means that one end of the channel 31 exposes the explosion-proof valve, and the other end of the channel 31 exposes the weak closed structure 41. It can be understood that since the weak closed structure 41 in the embodiments of the present application is a closed structure, compared with the weak structure provided with an opening, the difficulty of rupture is increased. In order to maintain a high exhaust efficiency, the embodiments of the present application provide that the plate body 30 is provided with a channel 31 communicating the explosion-proof valve and the weak closed structure 41. After the ejecta discharged inside the battery cell 20 breaks through the explosion-proof valve, the ejecta first accumulates in the channel 31. When the pressure of the ejecta accumulated in the channel 31 reaches a certain threshold, it is more likely to break through the weak closed structure 41, and then the ejecta is discharged. In the embodiments of the present application, setting a channel in the plate body 30 can, on the one hand, improve the exhaust efficiency, and on the other hand, compared with additionally providing a structure with a channel, it will not additionally occupy the volume of the accommodation space inside the box body assembly, so as to maintain the battery device with a small volume and weight.

[0092] In the above technical solution, when the internal pressure of the battery cell 20 is too high, the explosion-proof valve opens, and the ejecta discharged from the inside of the battery cell 20 can flow through the channel 31 of the plate body 30 to the weak closed structure 41 on the separator 40. The weak closed structure 41 ruptures under the action of pressure, playing a role in pressure relief and protection. The weak closed structures 41 corresponding to the remaining normal battery cells 20 remain closed, protecting the normal battery cells 20, and can improve the problem that the ejecta discharged from the abnormal battery cell 20 causes thermal influence on the surrounding normal battery cells 20 and triggers thermal runaway of the surrounding normal battery cells 20. Moreover, a channel 31 is also provided on the plate body 30 between the explosion-proof valve and the weak closed structure 41. The ejecta ejected from the inside of the battery cell 20 can first accumulate in the channel 31. When the pressure in the channel 31 reaches a certain threshold, it is easier to break through the corresponding weak closed structure 41, so that the ejecta inside the battery cell 20 can be discharged smoothly. Furthermore, while improving the problem of thermal runaway of the battery device, the exhaust efficiency of the battery cell 20 can be enhanced.

[0093] According to some embodiments of the present application, the explosion-proof valve is disposed at the bottom of the battery cell 20.

[0094] The explosion-proof valve is located at the bottom of the battery cell 20. The plate body 30 and the separator 40 can be disposed on one side of the bottom of the battery cell 20, and the plate body 30 can also play a role in supporting the battery cell 20.

[0095] In other words, the plate body 30 is located at the bottom opening of the main body 51, and the plate body 30 can be used as a bottom plate.

[0096] The bottom of the battery cell 20 is in contact with the plate body 30.

[0097] When the explosion-proof valve is disposed at the bottom of the battery cell 20, the end cap 21 can be disposed at the top of the battery cell 20.

[0098] In the above technical solution, when the battery cell 20 undergoes thermal runaway, compared with the ejecta being discharged from the top of the battery cell 20, the ejecta being discharged from the bottom of the battery cell 20 can avoid further improving the problem that the ejecta falls under the action of gravity and causes thermal runaway of the surrounding battery cells 20. Moreover, even if the ejecta discharged from the bottom of the battery cell 20 may bounce back to the surrounding battery cells 20 due to the influence of other structures in the battery device, since the separators 40 are also provided at the bottoms of the surrounding battery cells 20, the rebounded ejecta is not easily able to break through the separators 40, and thus the thermal influence of the ejecta on the surrounding battery cells 20 can be reduced, and the possibility of thermal runaway can be decreased.

[0099] Reference Figures 7 to 10, according to some embodiments of the present application, the battery device further includes a protection plate 52, the protection plate 52 is located on the side of the plate body 30 away from the battery cell 20 and is connected to the main body 51, the protection plate 52, the main body 51 and the plate body 30 enclose a cavity 52a, and the separator 40 is disposed in the cavity 52a.

[0100] In some embodiments, the connection manner between the main body 51 and the protection plate 52 may be a threaded connection.

[0101] It can be understood that both the protection plate 52 and the plate body 30 are connected to the main body 51, and the protection plate 52 is located on one side of the plate body 30. Therefore, the cavity 52a is located on one side of the accommodation space. The separator 40 is located in the cavity 52a, that is, the separator 40 is located between the protection plate 52 and the plate body 30.

[0102] When the plate body 30 has an opening at the bottom of the main body, the protection plate 52 can be used as a bottom protection plate. When the plate body 30 has an opening at the top of the main body, the protection plate can be used as a cover plate.

[0103] In some embodiments, the protection plate 52 may be a structure well-known to those skilled in the art. The composition materials of the protection plate 52 include but are not limited to aluminum-magnesium alloy, manganese steel, composite material, aluminum alloy, etc.

[0104] In the above technical solution, the protection plate 52 protects the separator 40 and the battery cells 20 and the circuit inside the accommodation space 50a. Since the separator 40 is provided between the plate body 30 and the protection plate 52, the ejected ejecta will not cause a large thermal impact on the surrounding battery cells 20 even if it is rebounded by the protection plate 52, reducing the possibility of thermal runaway of the battery device.

[0105] As Figure 10 shown, according to some embodiments of the present application, the channel 31 has opposite first and second openings, the edge of the first opening coincides with the edge of the explosion-proof valve 20a, and the second opening exposes the weak closed structure.

[0106] The first opening is close to the explosion-proof valve 20a, and the second opening is close to the weak closed structure.

[0107] The shape of the first opening is the same as the shape and size of the edge of the explosion-proof valve 20a close to the first opening, so that the edge of the first opening is aligned with the edge of the explosion-proof valve 20a.

[0108] The size of the second opening is greater than or equal to the size of the weak closed structure 41. In some embodiments, the shape of the second opening may be the same as the edge shape of the weak closed structure.

[0109] In some embodiments, the size of the first opening is equal to the size of the second opening.

[0110] In some embodiments, the shape of the first opening is the same as the shape of the second opening.

[0111] In the above technical solution, it is beneficial to enable the ejecta discharged from the explosion-proof valve 20a to accurately enter the channel 31 through the first opening and be discharged from the second opening to break through the weak sealing structure 41 for pressure relief, reducing the problem of accidental impact and damage to the surrounding battery cells 20 due to deviation of the pressure relief direction, and further improving the problem of thermal runaway of the battery device.

[0112] It can be understood that in other embodiments, the size of the first opening can also be larger than the size of the explosion-proof valve 20a, that is, the explosion-proof valve 20a is located within the first opening and does not contact the edge of the first opening. Moreover, the shape of the first opening can also be different from the shape of the explosion-proof valve 20a.

[0113] According to some embodiments of the present application, the edge of the second opening coincides with the edge of the weak sealing structure.

[0114] In other words, the second opening exactly exposes the weak sealing structure. The shape and size of the second opening are the same as the shape and size of the edge of the weak sealing structure close to the second opening.

[0115] In the above technical solution, the second opening exactly matches the size of the weak sealing structure, so that the size of the second opening is not too large compared to the size of the weak sealing structure. When the pressure of the ejecta discharged from the explosion-proof valve 20a remains constant, it can increase the impact force of the ejecta on the weak sealing structure, improve the rate and success rate of the ejecta breaking through the weak sealing structure, and also enable the ejecta discharged from the second opening to quickly pass through the weak sealing structure and be discharged, reducing the thermal impact on other battery cells 20 caused by the ejecta, improving the pressure relief efficiency, and reducing the risk of explosion caused by excessive pressure inside the battery cell 20.

[0116] It can be understood that in other embodiments, the size of the second opening can also be larger than the size of the weak sealing structure, that is, the weak sealing structure is located within the second opening and does not contact the edge of the second opening.

[0117] Such as Figure 5 、 Figure 6 and Figure 10 As shown, according to some embodiments of the present application, the weak sealing structure 41 includes a first surface and a second surface opposite to each other in the thickness direction, and the first surface includes at least one groove 411.

[0118] The first surface is recessed towards the direction close to the second surface to form the groove 411. The groove 411 occupies a partial area of the first surface, and the area of the first surface except the groove 411 can be a plane.

[0119] In some embodiments, the shape of the groove 411 includes, but is not limited to, a rectangle, a circle, or other irregular shapes, etc.

[0120] It can be understood that the thickness of the area of the weak sealing structure 41 provided with the groove 411 is less than the thickness of the area of the weak sealing structure 41 not provided with the groove 411, so that the position of the groove 411 is more likely to rupture.

[0121] In some embodiments, along the thickness direction of the weak sealing structure 41, the ratio of the recess depth of the groove 411 to the thickness of the area of the weak sealing structure 41 not provided with the groove 411 is greater than or equal to 0.3 and less than or equal to 0.7.

[0122] Exemplarily, the ratio of the recess depth of the groove 411 to the thickness of the area of the weak sealing structure 41 not provided with the groove 411 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.7.

[0123] In the above technical solution, since the thickness of the area of the weak sealing structure 41 provided with the groove 411 is less than the thickness of the area of the weak sealing structure 41 not provided with the groove 411, the ejecta is more likely to break through the groove 411 on the weak sealing structure 41, that is, break through the weak sealing structure 41, so as to timely discharge the ejecta inside the battery cell 20 and reduce the risk of thermal runaway of the battery cell 20.

[0124] Reference Figure 5 , according to some embodiments of the present application, the number of the grooves 411 is multiple, and the multiple grooves 411 are arranged at intervals along the circumferential direction of the weak sealing structure 41.

[0125] In other words, the multiple grooves 411 are arranged at intervals on the edge position of the weak sealing structure 41 to form a dotted annular notch structure. The weak sealing structure 41 can rupture at the position of the groove 411. That is, by arranging multiple grooves at the edge position of the weak sealing structure 41, the rupture position of the weak sealing structure 41 can be controlled at the periphery of the weak sealing structure, so that the rupture area of the weak sealing structure is small, and the probability of the discharged ejecta flowing back from the damaged part of the weak sealing structure is reduced.

[0126] In some embodiments, the multiple grooves 411 can be evenly arranged at intervals along the circumferential direction of the weak sealing structure 41.

[0127] In the above technical solution, the ejecta can exert an impact force on the multiple grooves 411 arranged along the circumferential direction of the weak sealing structure 41, so as to form a larger area opening for the ejecta to be discharged, and the pressure relief efficiency of the battery device can be improved.

[0128] It can be understood that in other embodiments, multiple grooves 411 may be arranged at intervals in one direction. For example, they may be arranged at intervals along the length or width direction of the weak sealing structure 41. That is to say, the multiple grooves 411 may not form a circular indentation, but form a linear indentation.

[0129] Reference Figure 6 , according to some embodiments of the present application, the number of grooves 411 is one, and the groove 411 extends along the circumferential direction of the weak sealing structure 41.

[0130] In other words, the weak sealing structure 41 has a groove 411 extending along its edge, and the groove 411 may be a continuous circular indentation. When the ejecta in the battery cell 20 is discharged to the weak sealing structure 41, cracks will expand along the continuous circular indentation and finally break along the indentation line to achieve exhaust.

[0131] In the above technical solution, the area occupied by the groove 411 on the first surface is relatively large, so that after the ejecta breaks through the weak sealing structure 41, a relatively large-area opening can be formed for pressure relief, improving the pressure relief efficiency of the battery device.

[0132] In other embodiments, the groove 411 may extend along the length or width direction of the weak sealing structure 41.

[0133] According to some embodiments of the present application, the first surface faces the channel 31.

[0134] That is to say, the second surface faces the protection plate 52. Among them, the second surface may be a plane or may have indentations.

[0135] In the above technical solution, the surface of the weak sealing structure 41 provided with the groove 411 faces the explosion-proof valve 20a of the battery cell 20, so that the surface of the weak sealing structure 41 provided with the groove 411 faces the ejecta directly, improving the impact force and breakthrough efficiency of the ejecta on the groove 411, and further improving the exhaust efficiency of the battery device.

[0136] According to some embodiments of the present application, the second surface is a plane.

[0137] The plane referred to in the embodiments of the present application has a shape close to but not exactly the same as the ideal plane in mathematics. Due to various reasons such as manufacturing processes, material properties, and environmental factors, there may be slight unevenness at the micro scale. This has a certain deviation from the ideal plane but can be regarded as a plane.

[0138] In some embodiments, the surfaces of other regions of the first surface except the groove 411 are also planes, so that the thickness of the region of the weak sealing structure 41 provided with the groove 411 is less than the thickness of the region of the weak sealing structure 41 not provided with the groove 411.

[0139] In the above technical solution, after the ejecta is discharged from the battery cell 20 in thermal runaway, even if the ejecta rebounds, the rebounding ejecta will fall back to the second surface. Since the second surface is a flat surface, compared with the second surface provided with the groove 411, the second surface is less likely to be penetrated by the ejecta, thereby improving the protection ability for the surrounding normal battery cells 20.

[0140] As Figure 5 and Figure 6 shown, according to some embodiments of the present application, the channel 31 has opposite first and second openings. The first opening exposes the explosion-proof valve 20a, and the second opening exposes the weak closing structure 41. The groove 411 is arranged along the circumferential direction of the second opening.

[0141] As Figure 5 shown, in some embodiments, the number of the grooves 411 is multiple, and the multiple grooves 411 are arranged at intervals along the circumferential direction of the second opening.

[0142] As Figure 6 shown, in some other embodiments, the number of the grooves 411 is one, and the groove 411 extends along the circumferential direction of the second opening.

[0143] In the above technical solution, after the ejecta is discharged from the second opening, it can impact the groove 411 along the circumferential direction of the second opening, which is beneficial to rupture the weak closing structure 41 to achieve timely and effective pressure relief and temperature reduction, thereby reducing the possibility of explosion of the battery cell 20 due to high pressure and high temperature inside.

[0144] It can be understood that in some other embodiments, the groove 411 can also be located within the second opening without contacting the edge of the second opening.

[0145] According to some embodiments of the present application, the thickness of the weak closing structure 41 is less than the thickness of other regions of the separator 40 except the weak closing structure 41.

[0146] In other words, the overall thickness of the weak closing structure 41 is less than the thickness of other regions of the separator 40 except the weak closing structure 41. In some embodiments, the weak closing structure 41 can have a uniform thickness everywhere.

[0147] In some embodiments, other regions of the separator 40 except the weak closing structure 41 can have a uniform thickness.

[0148] In some embodiments, the ratio of the thickness of the weak sealing structure 41 to the thickness of other regions of the separator 40 except the weak sealing structure 41 may be greater than or equal to 0.3 and less than or equal to 0.7. Exemplarily, the ratio of the thickness of the weak sealing structure 41 to the thickness of other regions of the separator 40 except the weak sealing structure 41 may be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65 or 0.7.

[0149] In the above technical solution, the thickness of the entire weak sealing structure 41 is thinned, so that the weak sealing structure 41 is likely to be broken as a whole under the impact of the ejecta, thereby providing a large opening for the ejecta ejected inside the battery cell 20 to achieve pressure relief and further improving the exhaust efficiency.

[0150] According to some embodiments of the present application, the separator 40 is a mica sheet.

[0151] The mica sheet is composed of mica, is in a sheet or plate shape, and has good high-temperature resistance, insulation and chemical stability.

[0152] In the case where the separator 40 may include a plurality of strip-shaped sub-separators, each sub-separator may be a mica sheet, and the weak sealing structure 41 is disposed on the mica sheet. Without limitation, the mica sheet may be attached to the surface of the plate body 30 by means of bonding, bolt connection or riveting.

[0153] In the above technical solution, since the mica sheet has good heat resistance and flame retardant properties, it can protect the battery cell 20 and further reduce the possibility that other battery cells 20 also undergo thermal runaway due to the thermal runaway of the battery cell 20.

[0154] An embodiment of the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0155] The electrical device has the beneficial effects of the battery device provided by the embodiment of the present application. For specific descriptions of the battery device, reference may be made to the above embodiments, and details are not described herein again.

[0156] An embodiment of the present application provides an energy storage device, which includes the battery device in the above embodiment, and the battery device is used to store electrical energy.

[0157] The energy storage device has the beneficial effects of the battery device provided by the embodiment of the present application. For specific descriptions of the battery device, reference may be made to the above embodiments, and details are not described herein again.

[0158] An embodiment of the present application provides a battery device, which includes a box body assembly, a plurality of battery cells 20, and a separator 40. The box body assembly includes a main body 51 and a plate body 30. At least one end of the main body 51 is open. The plate body 30 is located at the opening of the main body and is connected to the main body 51. The plate body 30 and the main body 51 enclose an accommodation space 50a inside; a plurality of battery cells 20 are arranged in the accommodation space 50a. The separator 40 is arranged on the side of the plate body 30 away from the battery cells 20. The plate body 30 has a plurality of channels 31 penetrating in the thickness direction, and the plurality of channels 31 correspond to the explosion-proof valves 20a of the plurality of battery cells 20 one by one. The separator 40 includes a plurality of weak closed structures 41, and the plurality of weak closed structures 41 correspond to the plurality of channels 31 one by one; wherein, the channel 31 communicates with the corresponding explosion-proof valve 20a and the weak closed structure 41.

[0159] The explosion-proof valve 20a is arranged at the bottom of the battery cell 20. The plate body 30 is located at the bottom opening of the main body 51 to form a bottom plate. The battery device further includes a protection plate 52. The protection plate 52 is located on the side of the plate body 30 away from the battery cells 20 and is connected to the main body 51. The protection plate 52, the main body 51, and the plate body 30 enclose a cavity 52a, and the separator 40 is arranged in the cavity 52a. The channel 31 has opposite first and second openings. The edge of the first opening coincides with the edge of the explosion-proof valve 20a, and the second opening exposes the weak closed structure 41.

[0160] The weak closed structure 41 includes a first surface and a second surface opposite to each other in the thickness direction. The first surface includes at least one groove 411.

[0161] Optionally, the number of the grooves 411 can be multiple, and the multiple grooves 411 are arranged at intervals along the circumferential direction of the weak closed structure 41.

[0162] Optionally, the number of the grooves 411 can also be one, and the groove 411 extends along the circumferential direction of the weak closed structure 41.

[0163] The first surface faces the channel 31, and the second surface is a plane.

[0164] The separator 40 can be a mica sheet.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; 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 they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description 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 way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box assembly comprises a body and a plate, wherein at least one end of the body is open, the plate is located at the opening of the body and connected to the body, and the plate and the body enclose a containing space; A plurality of battery cells are arranged in the accommodation space; A spacer, arranged on a side of the plate away from the battery cell; Among them, the plate body has multiple channels running through it along the thickness direction, and the multiple channels correspond one-to-one to the explosion-proof valves of the multiple battery cells; the isolation member includes multiple weak sealing structures, and the multiple weak sealing structures correspond one-to-one to the multiple channels, and the channels connect the corresponding explosion-proof valves and the weak sealing structures.

2. The battery device according to claim 1, characterized in that: The explosion-proof valve is arranged at the bottom of the battery cell.

3. The battery device according to claim 1 or 2, characterized in that: The battery device further comprises: A guard plate is located at a side of the plate body away from the battery cell and is connected to the main body. The guard plate, the main body and the plate body together form a cavity, and the isolating member is arranged in the cavity.

4. The battery device according to claim 1, characterized in that: The passage has a first opening and a second opening opposite to each other, the edge of the first opening coincides with the edge of the explosion-proof valve, and the second opening exposes the weak sealing structure.

5. The battery device according to claim 4, characterized in that: The edge of the second opening coincides with the edge of the weak sealing structure.

6. The battery device according to claim 1, characterized in that: The weak sealing structure includes a first surface and a second surface opposite to each other in a thickness direction, and the first surface includes at least one groove.

7. The battery device according to claim 6, characterized in that: There are multiple grooves, and the multiple grooves are arranged at intervals along the circumference of the weak closed structure.

8. The battery device according to claim 6, characterized in that: The number of the groove is one, and the groove extends along the circumference of the weak closed structure.

9. The battery device according to any one of claims 6 to 8, characterized in that: The first surface is disposed toward the channel.

10. The battery device according to claim 9, characterized in that: The second surface is a plane.

11. The battery device according to any one of claims 6 to 8, characterized in that: The channel has a first opening and a second opening opposite to each other, the first opening exposes the explosion-proof valve, the second opening exposes the weak sealing structure, and the groove is arranged along the circumference of the second opening.

12. The battery device according to claim 1 or 2, characterized in that: The thickness of the weak sealing structure is smaller than the thickness of other regions of the isolation member except the weak sealing structure.

13. The battery device according to claim 1 or 2, characterized in that: The isolation member is a mica sheet.

14. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-13.

15. An energy storage device, characterized in that: The energy storage device comprises a battery device as claimed in any one of claims 1 to 13, and the battery device is used to store electrical energy.

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