Battery cell, related device, system and charging network

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a related device, a system and a charging network, and the battery monomer comprises a shell; the pressure relief structure is arranged on the shell; the protection structure is arranged on the shell, the protection structure is located on the side, away from the shell, of the pressure relief structure, and the protection structure covers the pressure relief structure so as to shield the pressure relief structure; the protection structure is at least partially transparent; in the battery monomer provided by the embodiment of the invention, the protection structure covering the pressure relief structure is arranged on the outer side of the pressure relief structure so as to shield and protect the pressure relief structure and prevent external impurities from contacting the pressure relief structure, so that the possible damage of the external impurities to the pressure relief structure is reduced; the protection structure is at least partially transparent, so that the state of the pressure relief structure can be observed conveniently, and the pressure relief structure can be visually detected conveniently.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a battery monomer, a related device, a system and a charging network. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the case of thermal runaway of the battery monomer, high-temperature impurities carried by the high-temperature smoke eruption are easy to cause damage to the pressure relief structure of the adjacent battery monomer, and thus are easy to cause damage to the adjacent battery monomer. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a related device, a system and a charging network, which can alleviate the problem that the pressure relief structure is easy to be damaged by external high-temperature impurities.

[0005] In the first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0006] a shell, a pressure relief structure provided on the shell, and a protection structure provided on the shell, the protection structure being located on a side of the pressure relief structure away from the shell, the protection structure covering the pressure relief structure to shield the pressure relief structure, and the protection structure being at least partially transparent.

[0007] In the technical solution of the present embodiment, the protection structure covering the pressure relief structure is arranged outside the pressure relief structure to shield and protect the pressure relief structure, thereby preventing external impurities from contacting the pressure relief structure and reducing the damage that the external impurities may cause to the pressure relief structure. The protection structure is at least partially transparent to facilitate observation of the state of the pressure relief structure, thereby facilitating visual inspection of the pressure relief structure.

[0008] In some embodiments, the melting point of the protection structure is greater than the melting point of the pressure relief structure.

[0009] In the technical solution of the present embodiment, most of the high-temperature impurities generated due to thermal runaway of the battery monomer are fragments of the pressure relief structure. Therefore, the melting point of the protection structure is greater than the melting point of the pressure relief structure, so that the protection structure is difficult to be melted by the fragments generated by the melting of the pressure relief structure, thereby enabling the protection structure to better protect the pressure relief structure.

[0010] In some embodiments, the melting point of the protection structure ranges from 600 DEG C to 1600 DEG C.

[0011] The technical scheme of the embodiment provides a melting point range of the protection structure, so that the protection structure is difficult to be melted by high-temperature impurities generated by thermal runaway of the battery monomer, and the protection structure can better protect the pressure relief structure.

[0012] In some embodiments, the protection structure comprises a protection member covering at least part of the pressure relief structure, and the protection member is a transparent structure.

[0013] The technical scheme of the embodiment provides a specific structure of the protection structure, so that the protection member protects the pressure relief structure and covers at least part of the pressure relief structure, so as to prevent external impurities from contacting the pressure relief structure through the protection member, thereby reducing damage to the pressure relief structure caused by external impurities; and the protection member is a transparent structure, so as to facilitate observation of the state of the pressure relief structure, thereby facilitating visual inspection of the pressure relief structure.

[0014] In some embodiments, the protection member is a glass member.

[0015] In the technical scheme of the embodiment, the protection member is a glass member, so that the protection member is difficult to be melted by high-temperature impurities generated by thermal runaway of the adjacent battery monomer, and the protection member is transparent, so as to facilitate observation of the state of the pressure relief structure.

[0016] In some embodiments, the protection structure further comprises a connecting member arranged on the side of the protection member facing the shell, and the connecting member is used to connect the protection member to the shell.

[0017] The technical scheme of the embodiment provides a specific structure of the protection structure, and the connecting member is arranged to connect the protection member to the shell.

[0018] In some embodiments, the connecting member covers and is connected to the protection member, and the connecting member is a transparent structure.

[0019] In the technical scheme of the embodiment, the connecting member covers the protection member, so that the connecting member can connect the protection member to the shell, and the connecting member can also improve the strength of the protection member to reduce the risk of damage to the protection member caused by falling of external impurities, thereby better protecting the pressure relief structure; and the connecting member is a transparent structure, so as to facilitate observation of the pressure relief structure through the protection member and the connecting member, and reduce the interference of the connecting member with observation of the state of the pressure relief structure.

[0020] In some embodiments, the connecting member covers part of the protection member and forms a blank area on the protection member.

[0021] The technical scheme of the embodiment makes the connecting piece cover only a part of the protection piece, so that the connecting piece can connect the protection piece to the shell, and the connecting piece can also improve the strength of the covered part of the protection piece; the protection piece is a transparent structure, and the blank area not covered by the connecting piece is a transparent structure, so that the state of the pressure relief structure can be observed.

[0022] In some embodiments, the connecting piece is an adhesive structure and is bonded to the shell and the protection piece.

[0023] The technical scheme of the embodiment provides a specific structure of the connecting piece, so that the connecting piece is an adhesive structure, and the protection piece is bonded to the shell through the adhesion of the connecting piece.

[0024] In some embodiments, the protection piece is arranged in a spaced manner with the pressure relief structure, and a cavity is formed between the protection piece and the pressure relief structure.

[0025] In the technical scheme of the embodiment, the cavity is arranged between the protection piece and the pressure relief structure, so as to hinder the conduction of the temperature of the protection piece to the pressure relief structure through the cavity; at the same time, the arrangement of the cavity can also reduce the damage to the pressure relief structure in the case of deformation of the protection piece, so as to better protect the pressure relief structure.

[0026] In some embodiments, the shell is provided with a ventilation groove, one end of the ventilation groove is communicated with the cavity, the other end of the ventilation groove is communicated with a space outside the cavity, and the protection structure cover is arranged on the ventilation groove and covers at least part of the ventilation groove.

[0027] In the technical scheme of the embodiment, the ventilation groove is arranged on the shell and communicated with the cavity, so as to facilitate the staff to carry out the air tightness detection, and to detect the air tightness of the pressure relief structure.

[0028] In some embodiments, the connecting piece is provided with a notch, and the notch is opposite to the ventilation groove.

[0029] In the technical scheme of the embodiment, the notch opposite to the ventilation groove is arranged on the connecting piece, so as to reduce the risk that the connecting piece blocks the ventilation groove, thereby reducing the interference of the connecting piece to the air tightness detection and improving the accuracy of the air tightness detection.

[0030] In some embodiments, the color of the connecting piece is different from the color of the protection piece.

[0031] In the technical scheme of the embodiment, the color of the connecting piece is different from the color of the protection piece, so as to facilitate the staff to confirm the position of the notch, thereby reducing the situation that the notch is misaligned with the ventilation groove due to the installation error of the protection piece, and playing a foolproof role.

[0032] In some embodiments, the notch has at least two, and each notch is symmetrically arranged about the center of the protection piece.

[0033] The technical scheme of the embodiment makes the notches at least two and symmetrically arranged, in the case of incorrect installation of the protection member, one of the notches is opposite to the air passage, thereby reducing the interference of the connecting member on the air tightness detection and achieving the function of preventing incorrect installation.

[0034] In some embodiments, the protection structure further comprises a reinforcing member arranged on the side of the protection member away from the shell; the reinforcing member is at least partially transparent, and / or the reinforcing member covers part of the protection member.

[0035] The technical scheme of the embodiment provides specific structures of the protection structure, and the reinforcing member is arranged on the side of the protection member away from the shell to improve the strength of the protection member through the reinforcing member and reduce the risk of deformation or damage of the protection member caused by external impact.

[0036] In some embodiments, the protection structure further comprises a shielding member covering part of the pressure relief structure and connected to the shell; the shielding member is provided with a first through hole, and the protection member is connected to the shielding member and covers the first through hole.

[0037] The technical scheme of the embodiment provides specific structures of the protection structure, and the shielding member is arranged and the protection member is embedded on the shielding member, so that the shielding member and the protection member can protect the pressure relief structure; the protection member is arranged to facilitate observation of the state of the pressure relief structure through the protection member, and the shielding member can be an opaque structure to facilitate selection of a material with a higher melting point and strength for the shielding member.

[0038] In some embodiments, the melting point of the shielding member is greater than the melting point of the protection member, and the melting point of the protection member is greater than the melting point of the pressure relief structure.

[0039] In the technical scheme of the embodiment, the melting point of the shielding member is greater than the melting point of the protection member, so that the shielding member can better protect the pressure relief structure.

[0040] In some embodiments, the shell is provided with a second through hole, the pressure relief structure is accommodated in the second through hole, and at least part of the protection structure covers the second through hole.

[0041] In the technical scheme of the embodiment, the second through hole is arranged on the shell to accommodate the pressure relief structure through the second through hole, and the protection structure connected to the shell covers the pressure relief structure, and the hole wall of the second through hole can protect the circumferential side of the pressure relief structure, so that the protection structure only needs to protect the pressure relief structure in the axial direction of the second through hole, thereby facilitating the protection structure to better protect the pressure relief structure and facilitating the formation of a cavity between the protection structure and the pressure relief structure.

[0042] In some embodiments, the shell is provided with a boss surrounding the pressure relief structure, and the protection structure is connected to the boss.

[0043] In the technical solution of the embodiment, the boss surrounding the pressure relief structure is arranged to block liquid, dust and other impurities that may accumulate on the shell, so as to reduce the risk of liquid, dust and other impurities accumulated on the shell falling on the pressure relief structure. At the same time, the boss can also provide a fixing base for the protection structure, and the connection position of the protection structure and the boss can be higher than the surface of the corresponding shell of the protection structure, so as to reduce the negative impact of liquid, dust and other impurities accumulated on the shell on the connection stability of the protection structure.

[0044] In some embodiments, the shell includes a shell body and an end cover connected to the shell body, and the pressure relief structure and the protection structure are arranged on the end cover.

[0045] The technical solution of the embodiment provides a specific structure of the shell, so that the shell includes an end cover and a shell body, and the pressure relief structure and the protection structure are arranged on the end cover, so as to facilitate processing.

[0046] In the second aspect, some embodiments of the application also provide a battery device including the battery cell provided by some embodiments of the first aspect.

[0047] In the third aspect, some embodiments of the application also provide an energy storage device including the battery cell provided by some embodiments of the first aspect or the battery device provided by some embodiments of the second aspect; the battery cell is used for storing or providing electric energy.

[0048] In the fourth aspect, some embodiments of the application also provide an energy storage system including the energy storage device provided by some embodiments of the third aspect and a power conversion device; the power conversion device is used for electrically connecting a power generation device and the energy storage device.

[0049] In the fifth aspect, some embodiments of the application also provide a power consumption device including the battery cell provided by some embodiments of the first aspect, the battery device provided by some embodiments of the second aspect, the energy storage device provided by some embodiments of the third aspect, or the energy storage system provided by some embodiments of the fourth aspect; the battery cell is used for storing or providing electric energy.

[0050] In the sixth aspect, some embodiments of the application also provide a charging network including the energy storage device provided by some embodiments of the third aspect or the energy storage system provided by some embodiments of the fourth aspect; the charging network further includes a charging pile, and the energy storage device is used for providing electric energy for the charging pile.

[0051] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0052] 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 accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to be a limitation on the scope of the application. Moreover, in the drawings, like reference numerals refer to similar components throughout the several views. In the drawings:

[0053] Figure 1 A structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0054] Figure 2 An exploded structural schematic diagram of a battery device provided for some embodiments of the present application;

[0055] Figure 3 An exploded structural schematic diagram of a battery cell provided for some embodiments of the present application;

[0056] Figure 4 A top structural schematic diagram of an end cover of a battery cell provided for some embodiments of the present application;

[0057] Figure 5 A sectional schematic diagram in A-A line of Figure 4

[0058] A partial enlarged schematic diagram in B of Figure 6 Figure 5 A sectional schematic diagram in C of

[0059] Figure 7 A perspective schematic diagram of a protection structure provided for some embodiments of the present application;

[0060] Figure 8 A perspective schematic diagram of a protection structure provided for some other embodiments of the present application;

[0061] Figure 9 A partial enlarged schematic diagram in C of Figure 6

[0062] A perspective schematic diagram of a protection structure provided for some other embodiments of the present application Figure 10 ; Figure 1

[0063] Figure 11 A perspective schematic diagram of a protection structure provided for some other embodiments of the present application Figure 2 ;

[0064] Figure 12 A perspective schematic diagram of a protection structure provided for some other embodiments of the present application;

[0065] Figure 13 A perspective schematic diagram of a protection structure provided for some other embodiments of the present application; ​​

[0066] Figure 14 Structure diagram of energy storage system provided for some embodiments of the application;

[0067] Figure 15 Structure diagram of charging network provided for some embodiments of the application.

[0068] The meanings of the marks in the figure are:

[0069] 1, energy storage device; 2, power conversion device; 3, power generation device; 4, charging pile; 5, connector;

[0070] 1000, vehicle;

[0071] 100, battery device;

[0072] 10, box; 11, first box; 12, second box;

[0073] 20, battery cell; 21, shell; 211, end cover; 2111, cavity; 2112, air vent groove; 2113, second through hole; 2114, boss; 212, shell body; 22, pressure relief structure; 23, protection structure; 231, protection piece; 2311, blank area; 232, connecting piece; 2321, notch; 233, reinforcing piece; 234, shielding piece; 2341, first through hole; 24, electrode assembly; 25, electrode terminal;

[0074] 200, motor;

[0075] 300, controller. DETAILED DESCRIPTION

[0076] The embodiments of the technical solutions of the application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the application; the terms "include" and "have" and any variations thereof in the specification and claims of the application and the above description of drawings are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of the application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0079] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase “in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in to another embodiment.

[0080] In the description of the embodiments of the present application, the term “and / or” is merely used to describe an associated relationship between associated objects, and indicates that there can be three relationships, for example, A and / or B can indicate that there are three cases of A alone, A and B together, and B alone. In addition, the character “ / ” herein generally indicates that the front and rear associated objects are in an “or” relationship.

[0081] In the description of the embodiments of the present application, the term “a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0082] 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”, “axial”, “radial”, “circumferential”, and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0083] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms “mounting”, “connection”, “connection”, “fixing”, and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0084] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric vehicles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0085] In the case of thermal runaway of one or more battery cells in the battery device, the high-temperature smoke generated by thermal runaway is sprayed from the pressure relief structure of the battery cell, and the sprayed high-temperature smoke carries the fragments of the pressure relief structure, and the sprayed pressure relief structure fragments fall on the adjacent other normal battery cells. The sprayed pressure relief structure fragments are usually high in temperature, and part of these fragments are easy to fall on the pressure relief structure of the adjacent normal battery cell, thereby causing the pressure relief structure to fail and causing the battery cell to be damaged or broken.

[0086] Based on the above considerations, in order to alleviate the problem that the pressure relief structure is easy to be damaged by external high-temperature impurities, the battery cell provided by the embodiments of the present application is provided. A protection structure is arranged on one side of the pressure relief structure to cover and shield the pressure relief structure; at the same time, at least part of the protection structure is transparent.

[0087] In such a battery cell, the protection structure can shield the pressure relief structure, and the impurities from the outside can first fall on the protection structure to hinder the impurities from the outside from contacting the pressure relief structure through the protection structure, thereby reducing the contact between the impurities from the outside and the pressure relief structure and reducing the damage that the impurities from the outside may cause to the pressure relief structure. At the same time, at least part of the protection structure is transparent, so as to facilitate the observation of the state of the pressure relief structure, thereby facilitating the visual inspection of the pressure relief structure by the staff or detection equipment during production and installation, and also facilitating the observation of the pressure relief structure by the staff during the maintenance or other processes of the battery device.

[0088] The battery device disclosed by the embodiments of the present application can be used in a power consumption device using a battery as a power source or a variety of energy storage systems using a battery as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0089] The following embodiments take a power consumption device of an embodiment of the present application as an example for illustration.

[0090] Reference Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery can be used for power supply of the vehicle 1000, for example, the battery can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 300 and a motor 200, and the controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0091] In some embodiments of the present application, the battery can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0092] Reference Figure 2 , Figure 2 A disassembled structural schematic diagram of a battery apparatus 100 is provided for some embodiments of the present application.

[0093] The battery apparatus 100 mentioned in the embodiments of the present application can include one or more battery assemblies for providing voltage and capacity. The battery assembly can include a plurality of battery cells 20 connected in series, parallel, or mixed connection through busbar components.

[0094] In some embodiments, the battery assembly is generally formed by arranging a plurality of battery cells 20.

[0095] As an example, the battery assembly can be a battery module formed by arranging and fixing a plurality of battery cells 20 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 20 with a cable tie.

[0096] In some embodiments, the battery assembly can be a battery pack including a box 10 and one or more battery assemblies, and the battery assemblies are accommodated in the box 10.

[0097] As an example, the battery assembly can be a battery module, and the battery assembly can be accommodated in the box 10 by fixing the battery module in the box 10.

[0098] As an example, the battery assembly can also be accommodated in the box 10 by directly fixing a plurality of battery cells 20 in the box 10.

[0099] As an example, the case 10 can include a first case 11 and a second case 12. The first case 11 and the second case 12 are fastened so that an enclosed space is formed inside the case 10 to accommodate the battery assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first case 11 can be a top cover or a bottom plate.

[0100] As an example, the case 10 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame so that an enclosed space is formed inside the case 10 to accommodate the battery assembly.

[0101] In some embodiments, the case 10 can be part of the chassis structure of the vehicle 1000. For example, part of the case 10 can be at least part of the floor of the vehicle 1000, or part of the case 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0102] Reference Figure 3 , Figure 3 A schematic diagram of the exploded structure of the battery cell 20 is provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. As shown in the figure, the battery cell 20 includes a case 21, an electrode assembly 24, and other functional components; the case 21 includes a case body 212 and an end cover 211.

[0103] The end cover 211 refers to a component that covers the opening of the case body 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 211 can be adapted to the shape of the case body 212 to fit the case body 212. Alternatively, the end cover 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 211 is not easily deformed when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The end cover 211 can be provided with functional components such as electrode terminals 25. The electrode terminals 25 can be used to electrically connect with the electrode assembly 24 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cover 211 can also be provided with a pressure relief structure 22 for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value. The material of the end cover 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 211, which can be used to isolate the electrical connection components in the case body 212 from the end cover 211 to reduce the risk of short circuit. For example, the insulating piece can be plastic, rubber, etc.

[0104] The shell body 212 is a component for cooperating with the end cover 211 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 24, electrolyte and other components. The shell body 212 and the end cover 211 can be independent components, and an opening can be provided on the shell body 212, and the end cover 211 is made to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 211 and the shell body 212 can also be integrated, specifically, the end cover 211 and the shell body 212 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell body 212, the end cover 211 is made to cover the shell body 212. The shell body 212 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell body 212 can be determined according to the specific shape and size of the electrode assembly 24. The material of the shell body 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations.

[0105] The electrode assembly 24 is a component where electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 24 can be contained in the shell 21. The electrode assembly 24 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have parts with active materials constituting the main body of the electrode assembly 24, and the parts without active materials of the positive and negative electrode sheets each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect the electrode terminal 25 to form a current loop.

[0106] In a first aspect, with reference to Figures 3 to 6 The present application provides a battery cell 20, which comprises a shell 21, a pressure relief structure 22 and a protection structure 23. The pressure relief structure 22 is provided on the shell 21; the protection structure 23 is provided on the shell 21, and the protection structure 23 is located on the side of the pressure relief structure 22 away from the shell 21, the protection structure 23 covers the pressure relief structure 22 to shield the pressure relief structure 22; the protection structure 23 is at least partially transparent.

[0107] The shell 21 refers to a structure for forming an internal ring of the battery cell 20, that is, the shell 21 has an accommodation space for accommodating the electrode assembly 24, electrolyte and other structures; the shell 21 is also used to provide a fixing basis for the pressure relief structure 22 and the protection structure 23.

[0108] The pressure relief structure 22 refers to a structure in the battery monomer 20 for relieving internal pressure, and is used to relieve the internal pressure when the internal pressure or temperature of the battery monomer 20 reaches a threshold value. The pressure relief structure 22 can include a burst valve, a burst membrane, or other structures.

[0109] The pressure relief structure 22 is arranged on the shell 21, and can be in communication with the containing space in the shell 21, so that the pressure relief structure 22 can relieve the pressure in the containing space to the space outside the shell 21. The pressure relief structure 22 can be located on any side of the shell 21, that is, the pressure relief structure 22 can be arranged on the end face or bottom face of the shell 21, or can be arranged on the side face of the shell 21.

[0110] The protection structure 23 refers to a structure in the battery monomer 20 for protecting the pressure relief structure 22. The protection structure 23 is arranged on the side of the pressure relief structure 22 away from the shell 21, that is, the protection structure 23 is arranged on the side of the pressure relief structure 22 facing outside the shell 21. The protection structure 23 is connected to the shell 21, and can be connected to the shell 21 by welding, bonding, or the like.

[0111] The protection structure 23 covers the pressure relief structure 22, that is, the protection structure 23 can shield the pressure relief structure 22, so that external impurities are difficult to directly contact the pressure relief structure 22 by passing through the protection structure 23. That is, the external impurities are blocked by the protection structure 23, and it is difficult for the external impurities to contact the pressure relief structure 22 before the protection structure 23 is damaged. The external impurities can refer to water, dust, and other impurities with small weight, or can refer to structural fragments (metal fragments, plastic fragments, etc.) and other impurities with a certain weight.

[0112] According to the mounting mode of the pressure relief structure 22, the protection structure 23 can have various different structures. For example, when at least part of the pressure relief structure 22 protrudes from the shell 21, the protection structure 23 can be a box-shaped structure with an open side, and the open end is connected to the shell 21. At this time, the protection structure 23 can protect the side of the pressure relief structure 22 and the side facing outside the shell 21. For example, when the pressure relief structure 22 is embedded in the shell 21, the protection structure 23 can be a planar plate, a membrane, or other structures to cover and shield the pressure relief structure 22. It can be understood that the protection structure 23 can also include other structures, and is not limited to the above two structures.

[0113] At least part of the protection structure 23 is transparent, the protection structure 23 can be only partially transparent, or can be completely transparent; the transparency of the protection structure 23 means that the protection structure 23 can transmit light, so as to observe the pressure relief structure 22; therefore, under the premise that at least part of the protection structure 23 is transparent, the transparent part of the protection structure 23 can have color or can have no color. Since the protection structure 23 covers and shields the pressure relief structure 22, it is difficult for the staff or detection equipment to bypass the protection structure 23 to observe the pressure relief structure 22. Therefore, at least part of the protection structure 23 is made transparent, so that the staff or detection equipment can observe the pressure relief structure 22 through the transparent part of the protection structure 23.

[0114] While the protection structure 23 reduces the influence on the observation of the pressure relief structure 22, the protection structure 23 also needs to hinder external impurities from contacting the pressure relief structure 22; that is, the protection structure 23 needs to be at least partially transparent and also needs to have a certain strength; therefore, the material of the protection structure 23 can include glass, transparent ceramic and other transparent materials with a certain strength.

[0115] Since the pressure relief structure 22 is used to open and release pressure when the pressure or temperature inside the battery monomer 20 reaches a threshold value, that is, when the battery monomer 20 is in a normal state, the pressure relief structure 22 should be in a closed state, and external impurities falling on the pressure relief structure 22 are easy to cause damage or false opening of the pressure relief structure 22, thereby causing the pressure relief structure 22 to fail and easily causing the battery monomer 20 to leak electrolyte, short circuit and other situations. Therefore, the protection structure 23 is arranged to protect the pressure relief structure 22 and hinder external impurities from contacting the pressure relief structure 22, thereby improving the stability of the pressure relief structure 22 and improving the stability of the battery monomer 20.

[0116] For example, in the case of thermal runaway of one or more battery monomers 20 in the battery device 100, high-temperature flue gas generated by thermal runaway is sprayed from the pressure relief structure 22 of the battery monomer 20, and the sprayed high-temperature flue gas can carry fragments of the pressure relief structure 22; at this time, the protection structure 23 can hinder these fragments from contacting the pressure relief structure 22, thereby reducing the damage that these fragments can cause to the pressure relief structure 22, thereby reducing the influence of the thermal runaway battery monomer 20 on the adjacent normal battery monomer 20 and inhibiting the spread of thermal runaway.

[0117] In the production, maintenance and other working conditions of the battery monomer 20, the staff or detection equipment usually needs to visually detect the state of the pressure relief structure 22, so at least part of the protection structure 23 is made transparent to facilitate the staff or detection equipment to observe and detect the state of the pressure relief structure 22.

[0118] It can be understood that, in the case of thermal runaway of the battery monomer 20, the force of the gas pressure generated by the thermal runaway of the battery monomer 20 acting on the protection structure 23 is much greater than the force of the foreign matter (such as the fragments of the pressure relief structure 22) falling on the protection structure 23, so that the arrangement of the protection structure 23 is difficult to interfere with the relief of the internal pressure of the corresponding battery monomer 20; in the case of thermal runaway of the corresponding battery monomer 20, the gas pressure generated by the thermal runaway can damage the protection structure 23 to be released to the outside, or the protection structure 23 can be disconnected with the shell 21 to be released to the outside.

[0119] In the embodiment, the protection structure 23 is arranged outside the pressure relief structure 22 to cover the pressure relief structure 22, so as to shield and protect the pressure relief structure 22, hinder the foreign matter from contacting the pressure relief structure 22, and thus reduce the damage that the foreign matter can cause to the pressure relief structure 22; the protection structure 23 is at least partially transparent, so as to facilitate observation of the state of the pressure relief structure 22, and thus facilitate visual detection of the pressure relief structure 22.

[0120] In some embodiments, the melting point of the protection structure 23 is greater than the melting point of the pressure relief structure 22.

[0121] The melting point of the protection structure 23 refers to the temperature required for the protection structure 23 to change from a solid state to a liquid state; in the case where the protection structure 23 includes only one component, the melting point of the protection structure 23 is the melting point of the component; in the case where the protection structure 23 includes multiple components, the melting point of the protection structure 23 at least refers to the melting point of the component of the protection structure 23 that can be directly contacted by the foreign matter.

[0122] The melting point of the pressure relief structure 22 refers to the temperature required for the pressure relief structure 22 to change from a solid state to a liquid state; in the process of melting of the pressure relief structure 22, the temperature of the pressure relief structure 22 will be relatively stable until it completely changes from a solid state to a liquid state.

[0123] The pressure relief structure 22 can relieve the internal pressure of the battery monomer 20 when the internal temperature of the battery monomer 20 reaches a threshold value, that is, the pressure relief structure 22 is opened in the case of thermal runaway of the battery monomer 20. For example, in the case of thermal runaway of the battery monomer 20, the temperature generated by the thermal runaway of the battery monomer 20 will reach the melting point of the pressure relief structure 22, and cause the pressure relief structure 22 to partially melt and be damaged, the damaged pressure relief structure 22 is difficult to continue to close the accommodation space of the shell 21, at this time the internal pressure of the battery monomer 20 can be released from the pressure relief structure 22 to the outside of the shell 21.

[0124] The high-temperature impurities generated due to thermal runaway of the battery cell 20 are mostly fragments of the pressure relief structure 22; for example, in the case of thermal runaway of the battery cell 20, high-temperature smoke generated due to thermal runaway is sprayed out of the pressure relief structure 22, the sprayed high-temperature smoke can carry fragments of the pressure relief structure 22 out of the battery cell 20, and the fragments of the pressure relief structure 22 are likely to fall on the protection structure 23, at this time, the fragments of the pressure relief structure 22 are partially melted and have a relatively high temperature.

[0125] Accordingly, the melting point of the protection structure 23 is greater than the melting point of the pressure relief structure 22 in the embodiment, so that the protection structure 23 is difficult to be melted by the fragments generated due to melting of the pressure relief structure 22, and the damage of the fragments to the pressure relief structure 22 is reduced, so that the protection structure 23 can better protect the pressure relief structure 22, and the influence of the battery cell 20 in thermal runaway on the adjacent normal battery cell 20 is reduced, and the spread of thermal runaway is inhibited.

[0126] In some embodiments, the melting point of the protection structure 23 ranges from 600°C to 1600°C.

[0127] The melting point of the protection structure 23 ranges from 600°C to 1600°C, for example, the melting point of the protection structure 23 can be 600°C, 800°C, 1000°C, 1200°C, 1400°C, 1600°C or other values.

[0128] In the melting point range, the material of the protection structure 23 can include some plastics, glass, transparent ceramics and other materials. For example, in the case that the material of the protection structure 23 includes plastic, the material of the protection structure 23 can include polyimide (PI) and the like; for example, in the case that the material of the protection structure 23 includes glass, the material of the protection structure 23 can include silicate glass, quartz glass, borosilicate glass and the like; for example, in the case that the material of the protection structure 23 includes transparent ceramic, the material of the protection structure 23 can include alumina, yttrium-stabilized zirconia (YSZ), magnesium aluminate spinel, silicon carbide, aluminum nitride, zirconia and the like; for example, the material of the protection structure 23 can also include diamond, sapphire and the like.

[0129] For example, the melting point of the protection structure 23 can be 600°C, at this time, the protection structure 23 is convenient to process and form, and the material of the protection structure 23 can be selected more, so that the cost is controlled; for example, the material of the protection structure 23 can include polyimide, glass, transparent ceramic, diamond and the like.

[0130] For example, the melting point of the protection structure 23 can be 1100°C, at this time, the protection structure 23 has good high-temperature melting resistance, so that the damage of the high-temperature impurities to the pressure relief structure 22 can be better prevented; at the same time, the material of the protection structure 23 can also be selected more, for example, glass, transparent ceramic, diamond and the like.

[0131] For example, the melting point of the protective structure 23 can be 1600℃, and the protective structure 23 has excellent high-temperature melting resistance, so as to better prevent the high-temperature impurities from damaging the pressure relief structure 22, such as diamond, zirconia, etc.

[0132] The embodiment provides a melting point range of the protective structure 23, so that the protective structure 23 is difficult to be melted by the high-temperature impurities generated by the thermal runaway of the battery monomer 20, and the protective structure 23 can better protect the pressure relief structure 22.

[0133] Reference Figures 4 to 7 In some embodiments, the protective structure 23 includes a protective piece 231 covering at least part of the pressure relief structure 22, and the protective piece 231 is a transparent structure.

[0134] The protective piece 231 refers to a structure in the protective structure 23 for protecting the pressure relief structure 22, and the protective piece 231 covers at least part of the pressure relief structure 22, that is, the protective piece 231 can completely cover the pressure relief structure 22, or only cover at least part of the pressure relief structure 22 and cover the remaining part of the pressure relief structure 22 through other parts of the protective structure 23; the protective piece 231 is connected to the shell 21, and the protective piece 231 can be directly connected to the shell 21 by clamping, bonding or the like, and the protective piece 231 can be indirectly connected to the shell 21 through other structures of the protective structure 23.

[0135] The protective piece 231 is a transparent structure, that is, the staff or detection equipment can observe the pressure relief structure 22 through the protective piece 231; under the premise that the protective piece 231 is a transparent structure, the protective piece 231 can have a color or no color.

[0136] For example, because the protective piece 231 needs to protect the pressure relief structure 22 and facilitate observation by the staff or detection equipment, the protective piece 231 should be a structure with certain strength and transparency, and the protective piece 231 can be a glass member, a transparent ceramic member, etc.

[0137] The embodiment provides specific structures of the protective structure 23, so that the protective piece 231 of the protective structure 23 covers at least part of the pressure relief structure 22, so as to prevent external impurities from contacting the pressure relief structure 22 through the protective piece 231, thereby reducing damage to the pressure relief structure 22 caused by external impurities; and the protective piece 231 is a transparent structure, so as to facilitate observation of the state of the pressure relief structure 22, thereby facilitating visual inspection of the pressure relief structure 22.

[0138] In some embodiments, the protective piece 231 is a glass member.

[0139] The protection member 231 is a glass component. For example, the protection member 231 can be a silicate glass, a quartz glass, a borosilicate glass, or the like.

[0140] Glass has high hardness, high temperature resistance, strong waterproof performance, good light transmission performance, and good insulation performance. Therefore, the protection member 231 is a glass component. In this case, foreign matter falling on the protection member 231 is less likely to cause damage to the protection member 231. In addition, foreign matter is less likely to melt through the protection member 231. Therefore, the protection member 231 can better protect the pressure relief structure 22.

[0141] In this embodiment, the protection member 231 is a glass component. Therefore, the protection member 231 is difficult to be melted by high-temperature foreign matter generated by thermal runaway of the adjacent battery cell 20. In addition, the protection member 231 is transparent, so that the state of the pressure relief structure 22 can be observed.

[0142] Reference Figures 4 to 8 In some embodiments in which the protection structure 23 includes the protection member 231, the protection structure 23 further includes a connecting member 232. The connecting member 232 is arranged on the side of the protection member 231 facing the housing 21. The connecting member 232 is used to connect the protection member 231 to the housing 21.

[0143] The connecting member 232 refers to a structure in the protection structure 23 for connecting the protection member 231 to the housing 21. The connecting member 232 is arranged on the side of the protection member 231 facing the housing 21, so as to connect the protection member 231 to the housing 21. The connecting member 232 can be directly connected to the protection member 231, or indirectly connected to the protection member 231 through other structures of the protection structure 23. According to the material of the protection member 231, the connecting member 232 can be a bolt, a buckle, a glue layer, or other structures. The material of the connecting member 232 can include metal, plastic, adhesive material, or the like.

[0144] According to the structure of the connecting member 232, the connecting member 232 can only connect a part of the protection member 231. The connecting member 232 can also cover and be connected to the entire protection member 231. That is, in addition to being able to connect the protection member 231 to the housing 21, the connecting member 232 can also improve the strength of the protection member 231. In the case where the connecting member 232 connects a part of the protection member 231, the connecting member 232 can improve the strength of the connected part of the protection member 231. In the case where the connecting member 232 connects and covers the entire protection member 231, the connecting member 232 can improve the strength of the entire protection member 231.

[0145] This embodiment provides specific structures of some protection structures 23. The connecting member 232 is arranged to connect the protection member 231 to the housing 21 through the connecting member 232.

[0146] Reference Figures 4 to 7In some embodiments in which the protection structure 23 comprises the protection member 231 and the connecting member 232, the connecting member 232 covers and connects to the protection member 231, and the connecting member 232 is a transparent structure.

[0147] The connecting member 232 covers the protection member 231, that is, the connecting member 232 can completely cover the protection member 231. In this case, the connecting member 232 can not only connect the protection member 231 to the shell 21, but also share the force acting on the protection member 231, thereby improving the strength of the protection member 231. In the case where foreign matters fall on the protection member 231, part of the collision energy of the foreign matters can be transferred to the connecting member 232, so that the protection member 231 can better bear the foreign matters and is less likely to be damaged. Meanwhile, in the case where the protection member 231 is damaged, the foreign matters and the fragments generated by the damaged protection member 231 can also fall on the connecting member 232 and be blocked by the connecting member 232. In this case, the connecting member 232 can also hinder the foreign matters from falling on the pressure relief structure 22, thereby better protecting the pressure relief structure 22.

[0148] The connecting member 232 is a transparent structure, that is, the staff or detection equipment can observe the pressure relief structure 22 through the connecting member 232. In the case where the connecting member 232 is a transparent structure, the connecting member 232 can have a color or can have no color.

[0149] For example, in the case where the connecting member 232 is a buckle or the like, the material of the connecting member 232 can include plastic, glass or the like. For example, in the case where the connecting member 232 is a glue layer, the connecting member 232 can include polyethylene (PE) transparent glue, acrylic transparent glue, transparent acrylic double-sided adhesive or the like.

[0150] In this embodiment, the connecting member 232 covers the protection member 231. In this case, the connecting member 232 can not only connect the protection member 231 to the shell 21, but also improve the strength of the protection member 231, thereby reducing the risk of damage to the protection member 231 caused by falling of foreign matters, and better protecting the pressure relief structure 22. The connecting member 232 is a transparent structure, so that the pressure relief structure 22 can be observed through the protection member 231 and the connecting member 232, and the interference of the connecting member 232 with the observation of the state of the pressure relief structure 22 is reduced.

[0151] Reference Figures 4 to 6 、 Figure 8 In some embodiments in which the protection structure 23 comprises the protection member 231 and the connecting member 232, the connecting member 232 covers part of the protection member 231 and forms a blank area 2311 on the protection member 231.

[0152] The connecting member 232 only covers part of the protection member 231, that is, the connecting member 232 does not completely cover the protection member 231.

[0153] For the part of the protection piece 231 covered by the connecting piece 232, the connecting piece 232 can also play a role in improving the strength of the protection piece 231; in the case that foreign impurities fall on the area of the protection piece 231 covered by the connecting piece 232, part of the collision energy of the foreign impurities can be transmitted to the connecting piece 232, so that the protection piece 231 can better bear the foreign impurities and is less likely to be damaged, thereby better playing a role in protecting the pressure relief structure 22.

[0154] For the part of the protection piece 231 not covered by the connecting piece 232, this part is also the blank area 2311 formed on the protection piece 231; since the connecting piece 232 is not arranged in the blank area 2311, the connecting piece 232 is difficult to hinder the workers or detection equipment from observing the pressure relief structure 22 through the blank area 2311.

[0155] According to the structure and coverage area of the connecting piece 232, the connecting piece 232 can form one blank area 2311 on the protection piece 231, or form two or more blank areas 2311; in the case that the connecting piece 232 forms only one blank area 2311, the blank area 2311 can be located at the middle of the protection piece 231, or can be located at the edge of the protection piece 231.

[0156] For example, the connecting piece 232 can be a ring structure surrounding the protection piece 231, so as to connect the edge of the protection piece 231 to the shell 21; at this time, the blank area 2311 is formed at the middle of the protection piece 231, so as to facilitate the workers or detection equipment to observe the state of the pressure relief structure 22 through the blank area 2311.

[0157] It can be understood that, due to the arrangement of the blank area 2311, the connecting piece 232 in the embodiment can be a transparent structure, or can be an opaque structure; the connecting piece 232 has lower requirements on the material, and the material selection range of the connecting piece 232 is wider.

[0158] In the embodiment, the connecting piece 232 only covers part of the protection piece 231, so that the connecting piece 232 can connect the protection piece 231 to the shell 21, thereby the connecting piece 232 can also improve the strength of the covered part of the protection piece 231; since the protection piece 231 is a transparent structure, the blank area 2311 not covered by the connecting piece 232 is also a transparent structure, so as to facilitate the observation of the state of the pressure relief structure 22.

[0159] In some embodiments in which the protection structure 23 includes the protection piece 231 and the connecting piece 232, the connecting piece 232 is an adhesive structure, and is adhered to the shell 21 and the protection piece 231.

[0160] The connecting piece 232 is a sticky structure, that is, the connecting piece 232 can bond the protective piece 231 to the shell 21; the connecting piece 232 can include transparent glue, and can also include double-sided adhesive or other sticky structures.

[0161] For example, in the case where the connecting piece 232 includes transparent glue, the connecting piece 232 can include polyethylene (PE) transparent glue, acrylate transparent glue, etc., at this time, the connecting piece 232 can be formed in a liquid state and solidified, and the connecting piece 232 has high transparency and causes less interference to the observation of the pressure relief structure 22 by the staff or detection equipment.

[0162] For example, in the case where the connecting piece 232 includes double-sided adhesive, the connecting piece 232 can include transparent acrylic double-sided adhesive, etc., at this time, the connecting piece 232 can be directly in a solid state, and the connecting piece 232 has high strength and can better improve the strength of the protective piece 231.

[0163] In the case where the connecting piece 232 is a sticky structure, the connecting piece 232 can also provide resistance to the penetration of foreign impurities through the protective structure 23; in the case where the foreign impurities damage the protective piece 231, the sticky connecting piece 232 can provide greater resistance to the penetration of foreign impurities through the connecting piece 232, so that the foreign impurities are difficult to penetrate through the connecting piece 232 and fall on the pressure relief structure 22; at the same time, in the case where the protective piece 231 is broken, the sticky connecting piece 232 can also bond the fragments of the protective piece 231, so as to reduce the case where the fragments of the protective piece 231 fall on the pressure relief structure 22, thereby better playing a role in protecting the pressure relief structure 22.

[0164] The embodiment provides specific structures of some connecting pieces 232, so that the connecting piece 232 is a sticky structure, and the protective piece 231 is bonded to the shell 21 through the stickiness of the connecting piece 232.

[0165] Reference Figures 4 to 6 In some embodiments, the protective piece 231 is arranged in a spaced manner with the pressure relief structure 22, and a cavity 2111 is formed between the protective piece 231 and the pressure relief structure 22.

[0166] The protective piece 231 is arranged in a spaced manner with the pressure relief structure 22, and a cavity 2111 is formed between the protective piece 231 and the pressure relief structure 22, the cavity 2111 is mainly used to play a buffering role; in the case where the protective piece 231 is deformed due to the collision of foreign impurities, the protective piece 231 can be deformed into the cavity 2111, thereby reducing the damage of the deformation of the protective piece 231 to the pressure relief structure 22; in the case where a high-temperature impurity falls on the protective piece 231, the cavity 2111 can hinder the temperature of the protective piece 231 from being transmitted to the pressure relief structure 22, thereby better playing a role in protecting the pressure relief structure 22.

[0167] According to the mounting mode and specific structure of the pressure relief structure 22 and the protection structure 23, the cavity 2111 can be a space structure formed in the wall surface of the shell 21, or a space structure surrounded by the wall surface of the shell 21 and the protection structure 23. For example, in the case that at least part of the pressure relief structure 22 protrudes from the shell 21, the protection structure 23 can be a box-shaped structure with one side open, and the open end is connected to the shell 21, at this time the cavity 2111 is mainly surrounded by the protection structure 23; for example, in the case that the pressure relief structure 22 is embedded in the shell 21, a through hole is formed on the shell 21 and the pressure relief structure 22 is embedded in the through hole, at this time the hole wall of the through hole and the protection structure 23 jointly surround the cavity 2111; it can be understood that the cavity 2111 can also be formed by other structures, and is not limited to the above two.

[0168] In this embodiment, the cavity 2111 is arranged between the protection member 231 and the pressure relief structure 22, so as to hinder the temperature conduction of the protection member 231 to the pressure relief structure 22 through the cavity 2111; at the same time, the arrangement of the cavity 2111 can also reduce the damage to the pressure relief structure 22 in the case of deformation of the protection member 231, so as to better protect the pressure relief structure 22.

[0169] Reference Figures 4 to 6 , Figure 9 In some embodiments, the shell 21 is provided with a ventilation groove 2112, one end of the ventilation groove 2112 is in communication with the cavity 2111, and the other end of the ventilation groove 2112 is in communication with the space outside the cavity 2111.

[0170] The ventilation groove 2112 refers to a channel structure on the shell 21 for detecting the gas tightness of the explosion-proof valve, which can be a straight groove structure extending along a straight line, or a curved groove structure extending along a reference straight line; in the direction perpendicular to the extension direction of the ventilation groove 2112, the cross-sectional shape of the ventilation groove 2112 can be square, semicircular or other shapes.

[0171] The ventilation groove 2112 is arranged on the shell 21, and the protection structure 23 is arranged on the ventilation groove 2112 to form a channel for gas circulation between the protection structure 23 and the ventilation groove 2112; the protection structure 23 can only cover part of the ventilation groove 2112, or can completely cover the ventilation groove 2112.

[0172] One end of the vent groove 2112 is in communication with the cavity 2111, and the other end of the vent groove 2112 is in communication with the space outside the cavity 2111, that is, one end of the passage is in communication with the cavity 2111 and the other end is in communication with the space outside the cavity 2111. In the process of the air tightness detection, the air tightness detection device can fill the detection gas into the battery monomer 20 through the detection hole of the battery monomer 20, and if the air tightness of the pressure relief structure 22 is unqualified, the detection gas can enter the cavity 2111 through the pressure relief structure 22 and can be discharged to the outside through the passage, that is, in the process of the air tightness detection, whether the detection gas leaking exists in the vent groove can be detected to determine whether the air tightness of the pressure relief structure 22 meets the requirements.

[0173] Because the wall of the shell 21 should not be too thick, it is difficult to process the airflow passage in the wall of the shell 21, and the inner diameter of the airflow passage is also small. Accordingly, the vent groove 2112 is arranged on the shell 21 in the embodiment, the vent groove 2112 is in communication with the cavity 2111, and the vent groove 2112 cooperates with the protection structure 23 to form the passage, so as to facilitate the air tightness detection of the staff and reduce the processing difficulty of the passage.

[0174] Reference Figures 4 to 6 , Figure 9 , Figure 10 In some embodiments in which the shell 21 is provided with the vent groove 2112, the connecting piece 232 is provided with the notch 2321, and the notch 2321 is opposite to the vent groove 2112.

[0175] The notch 2321 is arranged on the connecting piece 232 and is used to be opposite to the vent groove 2112 to reduce the negative influence of the connecting piece 232 on the ventilation performance of the vent groove 2112; when the protection structure 23 covers the vent groove 2112, the notch 2321 is opposite to the vent groove 2112, at this time, the notch 2321 can be combined with the vent groove 2112 to form the airflow passage; the notch 2321 can be a straight groove structure extending along a straight line, the notch 2321 can also be a curved groove structure extending along a reference straight line, and the shape of the notch 2321 can be the same as that of the straight groove.

[0176] According to the length of the protection structure 23 covering the vent groove 2112, the length of the notch 2321 can be equal to the length of the vent groove 2112 or can be less than the length of the vent groove 2112.

[0177] It can be understood that during the installation of the protection structure 23, the notch 2321 of the connecting piece 232 should be opposite to the vent groove 2112.

[0178] In the case that the connecting piece 232 is transparent glue or double-sided tape, the transparent glue or double-sided tape is easy to fall into the vent groove 2112 and seal the vent groove 2112, and in the case that the vent groove 2112 is sealed by the transparent glue or double-sided tape, the detection gas leaked from the pressure relief structure 22 is difficult to be discharged to the outside through the vent groove 2112, thereby causing an error in the detection result of the air tightness detection and failing to accurately detect the air tightness of the pressure relief structure 22. At this time, the provision of the notch 2321 can reduce the interference of the connecting piece 232 on the gas flow performance of the vent groove 2112, thereby being able to more accurately detect the air tightness of the pressure relief structure 22.

[0179] In the embodiment, the notch 2321 is provided on the connecting piece 232 opposite to the vent groove 2112, so as to reduce the risk of the connecting piece 232 blocking the vent groove 2112, thereby being able to reduce the interference of the connecting piece 232 on the air tightness detection and improve the accuracy of the air tightness detection.

[0180] In some embodiments in which the connecting piece 232 is provided with the notch 2321, the color of the connecting piece 232 is different from the color of the protective piece 231.

[0181] In the case that the connecting piece 232 is provided with the notch 2321, the color of the connecting piece 232 is different from the color of the protective piece 231, which facilitates the staff to confirm the position of the notch 2321, thereby being able to reduce the risk of mispositioning of the notch 2321 and the vent groove 2112.

[0182] In the case that the connecting piece 232 covers part of the protective piece 231, the color of the connecting piece 232 can be different from the color of the protective piece 231. In the case that the connecting piece 232 completely covers the protective piece 231 and is a transparent structure, the connecting piece 232 needs to be transparent in addition to being different from the color of the protective piece 231. For example, the protective piece 231 is a colorless transparent structure, and at this time, the connecting piece 232 can be green, yellow or transparent structure of other colors.

[0183] In the embodiment, the color of the connecting piece 232 is different from the color of the protective piece 231, so as to facilitate the staff to confirm the position of the notch 2321, thereby being able to reduce the case of mispositioning of the notch 2321 and the vent groove 2112 caused by the installation error of the protective piece 231, and play a foolproof role.

[0184] Reference Figures 4 to 6 , Figure 9 , Figure 11 In some embodiments in which the connecting piece 232 is provided with the notch 2321, the notch 2321 has at least two, and each notch 2321 is symmetrically arranged about the center of the protective piece 231.

[0185] The notches 2321 are at least two, and the notches 2321 can be two, three or more; the notches 2321 are symmetrically arranged about the center of the protection member 231, so that the notches 2321 are opposite the air passage 2112 when the protection structure 23 is installed in different directions.

[0186] For example, the protection structure 23 can be a circular structure, and the notches 2321 can be symmetrically arranged about the center of the protection structure 23, so that the notches 2321 are opposite the protection member 231 when the protection structure 23 is installed in different directions.

[0187] For example, the protection structure 23 can also be a rectangular or elliptical structure, and the notches 2321 can be arranged along the length direction of the protection structure 23 according to the position of the air passage 2112; in this case, the notches 2321 are symmetrically arranged about the center of the protection structure 23 along the length direction of the protection structure 23, or the notches 2321 are symmetrically arranged about the center of the protection structure 23 along the width direction of the protection structure 23; in this case, the notches 2321 are opposite the protection member 231 when the protection structure 23 is installed in different directions.

[0188] For example, the protection structure 23 is an elliptical structure, the connecting member 232 is provided with two notches 2321, and the two notches 2321 are symmetrically arranged about the center of the protection structure 23 along the length direction of the protection structure 23; in this case, when the protection structure 23 is installed at any end along the length direction on the side of the shell 21 with the air passage 2112, the notches 2321 are opposite the air passage 2112, thereby playing a role of symmetrical foolproofing.

[0189] In the embodiment, the notches 2321 are at least two, and the notches 2321 are symmetrically arranged; in the case of incorrect installation of the protection member 231, one of the notches 2321 is opposite the air passage 2112, thereby reducing the interference of the connecting member 232 with the air tightness test and playing a role of foolproofing.

[0190] Reference Figure 12 In some embodiments in which the protection member 231 is a transparent structural member, the protection structure 23 further comprises a reinforcing member 233 arranged on the side of the protection member 231 away from the shell 21; the reinforcing member 233 is at least partially transparent, and / or the reinforcing member 233 covers part of the protection member 231.

[0191] The reinforcing member 233 is a structure in the protection structure 23 for improving the strength of the protection structure 23; the reinforcing member 233 can be a sheet structure, a rib structure or other shaped structure; the number of reinforcing members 233 can be one, two or more.

[0192] The reinforcing member 233 is arranged on the side of the protection member 231 away from the shell 21, so that the reinforcing member 233 can improve the strength of the protection structure 23 and reduce the interference of the reinforcing member 233 with the arrangement of the connecting member 232; the reinforcing member 233 can be connected to the protection member 231 by adhesion, clamping or the like, or the reinforcing member 233 can be integrally formed with the protection member 231.

[0193] In the case where the protection member 231 is a transparent structural member, to reduce the interference of the reinforcing member 233 with the observation of the pressure relief structure 22 by the staff or detection equipment, the reinforcing member 233 can be at least partially transparent, or the reinforcing member 233 can cover only a part of the protection member 231, so that the staff or detection equipment can observe the pressure relief structure 22 through the part of the protection member 231 not covered by the reinforcing member 233.

[0194] For example, the reinforcing member 233 can be at least partially transparent, that is, the reinforcing member 233 can be entirely transparent or only partially transparent, and the material of the reinforcing member 233 can include glass, plastic or the like, for example, the reinforcing member 233 can be a polymethyl methacrylate film; for example, the reinforcing member 233 can cover only a part of the protection member 231, and the staff or detection equipment can observe the pressure relief structure 22 from the part of the protection member 231 not covered by the reinforcing member 233, and in this case, the reinforcing member 233 can be a reinforcing rib, which can be transparent or non-transparent.

[0195] The embodiment provides some specific structures of the protection structure 23, the reinforcing member 233 is arranged on the side of the protection member 231 away from the shell 21, so as to improve the strength of the protection member 231 by the reinforcing member 233 and reduce the risk of deformation or damage of the protection member 231 caused by external impact; at least part of the reinforcing member 233 is transparent, so as to reduce the interference of the reinforcing member 233 with the observation of the state of the pressure relief structure 22.

[0196] Reference Figure 13 In some embodiments in which the protection member 231 is a transparent structural member, the protection structure 23 further comprises a shielding member 234, the shielding member 234 covers a part of the pressure relief structure 22 and is connected to the shell 21; the shielding member 234 is provided with a first through hole 2341, and the protection member 231 is connected to the shielding member 234 and covers the first through hole 2341.

[0197] The shielding member 234 refers to a structure in the protection structure 23 for protecting the pressure relief structure 22, the shielding member 234 protects a part of the pressure relief structure 22, so as to protect the part of the pressure relief structure 22 shielded by the shielding member 234, and another part of the pressure relief structure 22 is protected by the protection member 231.

[0198] The shielding piece 234 is connected to the shell 21. The shielding piece 234 can be directly connected to the shell 21 by clamping, bonding or the like. The shielding piece 234 can also be indirectly connected to the shell 21 through other structures of the protection structure 23. When the protection structure 23 includes the connecting piece 232, the shielding piece 234 can be connected to the shell 21 through the connecting piece 232. At this time, the protection piece 231 is indirectly connected with the connecting piece 232 through the shielding piece 234. The protection piece 231 is indirectly connected with the shell 21 through the shielding piece 234 and the connecting piece 232.

[0199] The first through hole 2341 refers to a hole structure provided on the shielding piece 234. The first through hole 2341 can be a square hole, a circular hole or a hole structure of other shapes. The first through hole 2341 can be a straight hole, a stepped hole, a tapered hole or a hole structure of other shapes. The number of the first through hole 2341 can be one, two or more.

[0200] The protection piece 231 covers the first through hole 2341 to block impurities in the outside world from directly falling on the pressure relief structure 22 through the first through hole 2341. The protection piece 231 can be embedded in the first through hole 2341. The protection piece 231 can be provided on the side of the shielding piece 234 facing the outside world or the pressure relief structure 22 to cover the first through hole 2341. The protection piece 231 can be connected to the shielding piece 234 by bonding, clamping or the like.

[0201] Because the protection structure 23 includes the transparent protection piece 231, the protection piece 231 can serve as an observation window. Workers or detection equipment can observe the state of the pressure relief structure 22 through the protection piece 231. At this time, the shielding piece 234 does not need to be transparent. The shielding piece 234 can be made of a material with a higher melting point and strength to better protect the pressure relief structure 22. For example, the material of the shielding piece 234 can include metal.

[0202] For example, the shielding piece 234 can be provided with one first through hole 2341, and the protection piece 231 can be embedded in the first through hole 2341. For example, the shielding piece 234 can also be provided with a plurality of first through holes 2341, and the protection piece 231 can be embedded in each first through hole 2341. At this time, the shielding piece 234 is a mesh structure.

[0203] The embodiment provides some specific structures of the protection structure 23. The shielding piece 234 is provided, and the protection piece 231 is embedded on the shielding piece 234. At this time, the shielding piece 234 and the protection piece 231 can protect the pressure relief structure 22. The protection piece 231 is provided to facilitate observation of the state of the pressure relief structure 22 through the protection piece 231. At this time, the shielding piece 234 can be an opaque structure to facilitate selection of a material with a higher melting point and strength for the shielding piece 234.

[0204] In some embodiments, the melting point of the shielding member 234 is greater than the melting point of the protective member 231, and the melting point of the protective member 231 is greater than the melting point of the pressure relief structure 22.

[0205] The melting point of the pressure relief structure 22 refers to the temperature required for the pressure relief structure 22 to change from a solid state to a liquid state. During the melting process of the pressure relief structure 22, the temperature of the pressure relief structure 22 will be relatively stable until it completely changes from a solid state to a liquid state.

[0206] The melting point of the protective member 231 refers to the temperature required for the protective member 231 to change from a solid state to a liquid state.

[0207] The melting point of the protective member 231 is greater than the melting point of the pressure relief structure 22, so that the protective member 231 is difficult to be melted by the fragments generated by the melting of the pressure relief structure 22, reducing the damage that these fragments may cause to the pressure relief structure 22, so that the protective structure 23 can play a role in protecting the pressure relief structure 22.

[0208] The melting point of the shielding member 234 refers to the temperature required for the shielding member 234 to change from a solid state to a liquid state. By making the melting point of the shielding member 234 greater than the melting point of the protective member 231, the shielding member 234 can better protect the pressure relief structure 22, and it is more difficult for external impurities to melt the shielding member 234, so that the protective structure 23 can better protect the pressure relief structure 22. At this time, in addition to the fragments of the pressure relief structure 22, the protective structure 23 also has better protection capability for other structural fragments.

[0209] In the present embodiment, the melting point of the shielding member 234 is greater than the melting point of the protective member 231, so that the shielding member 234 can better protect the pressure relief structure 22.

[0210] Reference Figures 4 to 6 、 Figure 9 In some embodiments, the shell 21 is provided with a second through hole 2113, and the pressure relief structure 22 is accommodated in the second through hole 2113, and at least part of the protective structure 23 covers the second through hole 2113.

[0211] The second through hole 2113 refers to a hole structure provided on the shell 21. The second through hole 2113 can be a square hole, a circular hole, or a hole structure of other shapes. The second through hole 2113 can be a straight hole, a stepped hole, a tapered hole, or a hole structure of other shapes. The second through hole 2113 is used to accommodate the pressure relief structure 22. According to the required installation position of the pressure relief structure 22, the second through hole 2113 can be provided on the end face, side face, or bottom face of the shell 21.

[0212] The pressure relief structure 22 is accommodated in the second through hole 2113, and the pressure relief structure 22 is connected to the hole wall of the second through hole 2113 and seals the second through hole 2113, so that the gas in the battery monomer 20 can only be discharged to the outside of the battery monomer 20 through the pressure relief structure 22.

[0213] The protection structure 23 covers at least part of the second through hole 2113, so that the protection structure 23 can cover the pressure relief structure 22 and can hinder the external impurities from directly contacting the pressure relief structure 22, thereby playing a protective effect on the pressure relief structure 22.

[0214] The protection structure 23 can be connected to the hole wall of the second through hole 2113 or the surface of the shell 21 facing the outside; in the case of providing the second through hole 2113, the protection structure 23 can be more easily arranged apart from the pressure relief structure 22, so as to form the cavity 2111 between the protection structure 23 and the pressure relief structure 22.

[0215] In the embodiment, the second through hole 2113 is provided on the shell 21 to accommodate the pressure relief structure 22 through the second through hole 2113, and the protection structure 23 connected to the shell 21 covers the pressure relief structure 22, the hole wall of the second through hole 2113 can protect the circumferential side of the pressure relief structure 22, at this time, the protection structure 23 only needs to protect the pressure relief structure 22 in the axial direction of the second through hole 2113, thereby facilitating the protection structure 23 to better protect the pressure relief structure 22, and facilitating the formation of the cavity 2111 between the protection structure 23 and the pressure relief structure 22.

[0216] Reference Figures 4 to 6 , Figure 9 In some embodiments, the shell 21 protrudes a boss 2114 around the pressure relief structure 22, and the protection structure 23 is connected to the boss 2114.

[0217] The boss 2114 refers to a structure protruding outward from the shell 21 on the shell 21, the boss 2114 is arranged around the pressure relief structure 22, the boss 2114 can be a circular ring structure, or a square ring structure or other shaped structure; in the direction perpendicular to the extension of the boss 2114, the cross-sectional shape of the boss 2114 can be square, trapezoidal or other shapes; the boss 2114 can be connected to the shell 21 by welding, bonding or other methods, the boss 2114 can also be integrally formed with the shell 21; the material of the boss 2114 can include metal, plastic or other materials, and the material of the boss 2114 can be the same as or different from that of the shell 21.

[0218] The boss 2114 is arranged around the pressure relief structure 22 to form a space on the shell 21 for accommodating the pressure relief structure 22, and the pressure relief structure 22 can be arranged in the space; in the case of providing the second through hole 2113 on the shell 21, the second through hole 2113 can also be arranged in the space.

[0219] The protection structure 23 is connected to the boss 2114. The protection structure 23 can be connected to the side of the boss 2114 facing the outside world, or the protection structure 23 can be connected to the inner side wall of the boss 2114 and located in the space surrounded by the boss 2114.

[0220] The boss 2114 protrudes from the outer surface of the shell 21, so that the boss 2114 can provide protection for the pressure relief structure 22 from the side. In the case of accumulation of liquid, dust and other impurities on the shell 21, the boss 2114 can block the impurities from contacting the pressure relief structure 22, thereby protecting the pressure relief structure 22. At the same time, the arrangement of the boss 2114 can also reduce the contact of external impurities with the connection position of the protection structure 23 and the boss 2114, thereby improving the stability of the connection of the protection structure 23.

[0221] In this embodiment, the boss 2114 is arranged around the pressure relief structure 22 to block the liquid, dust and other impurities that may accumulate on the shell 21, thereby reducing the risk of liquid, dust and other impurities accumulated on the shell 21 falling on the pressure relief structure 22. At the same time, the boss 2114 can also provide a fixing base for the protection structure 23, and the connection position of the protection structure 23 and the boss 2114 can be higher than the surface of the shell 21 corresponding to the protection structure 23, so as to reduce the negative impact of liquid, dust and other impurities accumulated on the shell 21 on the connection stability of the protection structure 23.

[0222] Reference Figures 3 to 5 In some embodiments, the shell 21 includes a shell body 212 and an end cover 211 connected to the shell body 212. The pressure relief structure 22 and the protection structure 23 are both arranged on the end cover 211.

[0223] The end cover 211 refers to a component that covers the opening of the shell body 212 to isolate the internal environment of the battery monomer 20 from the external environment. The electrode terminal 25 of the battery monomer 20 can be arranged on the end cover 211.

[0224] The shell body 212 is a component used in cooperation with the end cover 211 to form the internal environment of the battery monomer 20, wherein the formed internal environment can be used to accommodate the electrode assembly 24, the electrolyte and other components.

[0225] The pressure relief structure 22 and the protection structure 23 are both arranged on the end cover 211 to facilitate processing. Since the circumferential side of the battery monomer 20 is usually provided with other battery monomers 20, and the bottom surface of the battery monomer 20 is usually connected to the box body 10, arranging the pressure relief structure 22 and the protection structure 23 on the end cover 211 can also reduce the negative impact of other structures on the pressure relief of the pressure relief structure 22.

[0226] The embodiment provides specific structures of the shell 21, so that the shell 21 comprises an end cover 211 and a shell body 212, and the pressure relief structure 22 and the protection structure 23 are arranged on the end cover 211, so as to facilitate processing.

[0227] In some embodiments, the battery monomer 20 comprises the shell 21, the pressure relief structure 22 and the protection structure 23.

[0228] The shell 21 comprises the shell body 212 and the end cover 211 arranged on the shell body 212; the end cover 211 is provided with a second through hole 2113, and the pressure relief structure 22 is embedded in the second through hole 2113; the end cover 211 is further provided with a boss 2114 surrounding the second through hole 2113; and the protection structure 23 is connected to a side of the boss 2114 away from the shell body 212.

[0229] The protection structure 23 comprises a protection piece 231 and a connecting piece 232, and the protection piece 231 is a glass structure.

[0230] The connecting piece 232 is arranged on a side of the protection piece 231 facing the boss 2114, one end of the connecting piece 232 is connected to the boss 2114, and the other end of the connecting piece 232 is connected to the protection piece 231; the connecting piece 232 is a structure formed by curing of glue, the connecting piece 232 is also transparent, and the connecting piece 232 completely covers a side of the protection piece 231 facing the pressure relief structure 22.

[0231] The boss 2114 is provided with a ventilation groove 2112, and the protection structure 23 covers the ventilation groove 2112 and forms an air flow channel; the connecting piece 232 is provided with notches 2321 on both sides along the length direction, the two notches 2321 are symmetrical about the center of the connecting piece 232, and any one of the two notches 2321 is opposite to the ventilation groove 2112.

[0232] In the second aspect, some embodiments of the battery device 100 comprise the battery monomer 20 provided by some embodiments of the first aspect.

[0233] In the battery device 100, the protection structure 23 can protect the pressure relief structure 22, and in the case that other battery monomers 20 adjacent to each other are in thermal runaway, high-temperature impurities generated by thermal runaway are difficult to melt through the protection structure 23 and fall on the pressure relief structure 22; meanwhile, the protection structure 23 is at least partially transparent, so that the pressure relief structure 22 can be observed by workers or detection equipment.

[0234] In the third aspect, some embodiments of the energy storage device 1 comprise the battery monomer 20 provided by some embodiments of the first aspect or the battery device 100 provided by some embodiments of the second aspect; and the battery monomer 20 is used for storing or providing electric energy.

[0235] The energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of the energy storage device 1. The battery cluster can include a plurality of battery devices 100 connected in series by busbars to increase the voltage of the energy storage device 1. When the energy storage device 1 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device 1.

[0236] The energy storage device 1 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device 1 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 1 can store electrical energy during a low electricity consumption period and provide electrical energy to relevant users or electrical equipment during a high electricity consumption period. The energy storage system provided by the embodiments of the present application can be any power system that needs to use the energy storage device 1.

[0237] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0238] In some embodiments, the energy storage device 1 can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0239] In some embodiments, the energy storage device 1 can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0240] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid to each battery device 100 through a pipeline to adjust the temperature of the battery cell 20.

[0241] As an example, the master control module can serve as a battery management unit of the battery cluster to monitor and manage the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fuse switch, and other modules.

[0242] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0243] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0244] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 1 that require electricity.

[0245] Fourthly, refer to Figure 14 Some embodiments of this application also provide an energy storage system, including an energy storage device 1 and a power conversion device 2 provided in some embodiments of the third aspect, wherein the power conversion device 2 is used to electrically connect a power generation device 3 and an energy storage device 1.

[0246] An energy storage system may include one or more energy storage devices 1 and a power conversion system 2 (PCS), wherein the power conversion system 2 is connected between a power generation device 3 and an energy storage device 1. The power generation device 3 generates electrical energy, which can be stored in the energy storage device 1 via the power conversion system 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device 3, a thermal power generation device 3, a wind power generation device 3, etc. The specific type of the power generation device 3 is not limited in this application.

[0247] Fifthly, some examples of this application also provide an electrical device, including a battery cell 20 provided in some embodiments of the first aspect, or a battery device 100 provided in some embodiments of the second aspect; or an energy storage device 1 provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect. The battery cell 20 is used to store or provide electrical energy.

[0248] Sixth aspect, refer to Figure 15 Some embodiments of this application also provide a charging network, including a charging pile 4 and an energy storage device 1 provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect. The energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0249] The charging pile 4 is electrically connected with the energy storage device 1, and the energy storage device 1 is used to provide electric energy for the charging pile 4. The charging pile 4 is electrically connected with the battery device 100 in the energy storage device 1 through a cable, and the battery device 100 can provide the stored electric energy to the charging pile 4. The charging pile 4 has one or more connectors 5, which are used to connect with the electric equipment (such as a vehicle 1000), so as to charge the electric equipment.

[0250] The energy storage device 1 can be located inside the charging pile 4 (for example, a charging and storing integrated machine), or outside the charging pile 4.

[0251] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature 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 falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, comprising: a shell; a pressure relief structure arranged on the shell; a protection structure arranged on the shell, the protection structure being located on a side of the pressure relief structure away from the shell, the protection structure covering the pressure relief structure to shield the pressure relief structure; the protection structure being at least partially transparent.

2. The battery cell of claim 1, wherein, The melting point of the protection structure is greater than the melting point of the pressure relief structure.

3. The battery cell according to claim 1 or 2, characterized in that, The melting point of the protection structure ranges from 600 DEG C to 1600 DEG C.

4. The battery cell of any one of claims 1-3, wherein, The protection structure comprises a protection member covering at least part of the pressure relief structure; the protection member being a transparent structure.

5. The battery cell of claim 4, wherein, The protection member is a glass member.

6. The battery cell according to claim 4 or 5, characterized in that The protection structure further comprises a connecting member arranged on a side of the protection member facing the shell, the connecting member being used to connect the protection member to the shell.

7. The battery cell of claim 6, wherein, The connecting member covers and is connected to the protection member, and the connecting member is a transparent structure.

8. The battery cell of claim 6, wherein, The connecting member covers part of the protection member and forms a blank area on the protection member.

9. The battery cell of any one of claims 6-8, wherein, The connecting member is an adhesive structure and is bonded to the shell and the protection member.

10. The battery cell of any one of claims 6-9, wherein, The protection member is spaced apart from the pressure relief structure and forms a cavity between the protection member and the pressure relief structure.

11. The battery cell of claim 10, wherein, The shell is provided with a ventilation groove, one end of the ventilation groove is in communication with the cavity, and the other end of the ventilation groove is in communication with a space outside the cavity. The protection structure cover is arranged on the ventilation groove and covers at least part of the ventilation groove.

12. The battery cell of claim 11, wherein, The connecting member is provided with a notch, and the notch is opposite to the ventilation groove.

13. The battery cell of claim 12, wherein, The color of the connecting member is different from the color of the protection member.

14. The battery cell of claim 12, wherein, The notch has at least two, and each notch is symmetrically arranged about the center of the protection member.

15. The battery cell of any one of claims 4-14, wherein, The protection structure further comprises a reinforcing member arranged on a side of the protection member away from the shell. The reinforcing member is at least partially transparent, and / or the reinforcing member covers part of the protection member.

16. The battery cell of any one of claims 4-15, wherein, The protection structure further comprises a shielding member covering part of the pressure relief structure and connected to the shell. The shielding member is provided with a first through hole, and the protection member is connected to the shielding member and covers the first through hole.

17. The battery cell of claim 16, wherein, The melting point of the shielding member is greater than the melting point of the protection member, and the melting point of the protection member is greater than the melting point of the pressure relief structure.

18. The battery cell of any one of claims 1-17, wherein, The shell is provided with a second through hole, the pressure relief structure is accommodated in the second through hole, and at least part of the protection structure covers the second through hole.

19. The battery cell of any one of claims 1-18, wherein, The shell is provided with a boss surrounding the pressure relief structure, and the protection structure is connected to the boss.

20. The battery cell of any one of claims 1-19, wherein, The shell comprises a shell body and an end cover connected to the shell body, and the pressure relief structure and the protection structure are arranged on the end cover.

21. A battery device, characterized by The application further relates to a battery device comprising a plurality of battery cells as claimed in any one of claims 1 to 20 or a plurality of battery devices as claimed in claim 21, the battery cells being used to store or provide electric energy.

22. An energy storage device, comprising: The application further relates to an energy storage device as claimed in claim 22 and a power conversion device, the power conversion device being used to electrically connect a power generation device and the energy storage device.

23. An energy storage system characterized by, ​ 24. An electrical device, comprising: A battery monomer as claimed in any one of claims 1-20, a battery device as claimed in claim 21, an energy storage device as claimed in claim 22, or an energy storage system as claimed in claim 23, for storing or providing electrical energy.

25. A charging network characterized in that, An energy storage device as claimed in claim 22, or an energy storage system as claimed in claim 23; The charging network further comprises a charging post, the energy storage device being configured to provide electrical energy to the charging post.

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