Battery, electric device and airtightness testing method

Abstract

The present application is applicable to the technical field of batteries (100). Provided are a battery (100), an electric device and an airtightness testing method. The electric device comprises the battery (100). The battery (100) comprises battery cells (10), a case (20), a protective plate (30) and a sealing structure (50), wherein a first space (201) is provided in the case (20); the battery cells (10) are accommodated in the first space (201); a first case wall (211) of the case (20) is provided with a through hole (202); the protective plate (30) is connected to the exterior of the case (20) and encloses a second space (60) together with the first case wall (211); the second space (60) can be in communication with the first space (201) by means of the through hole (202); and the sealing structure (50) seals the through hole (202), such that the first space (201) and the second space (60) are isolated from each other. In this way, a test fixture only needs to fit the case (20) to realize airtightness testing, without the need for two different test fixtures, thereby reducing the cost of airtightness testing.

Description

Battery, electric device and air tightness detection method

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese patent application No. 202410840288.7, filed on June 26, 2024, and entitled "Battery, electric device and air tightness detection method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery, an electric device and an air tightness detection method. BACKGROUND

[0004] The battery can include a battery cell, a box body, a protection plate and a thermal management component. The box body is internally provided with a first space, and the battery cell is accommodated in the first space. The protection plate is connected to the box body and forms a second space with the outer wall of the box body. The thermal management component is arranged in the second space. Before the battery is produced, the first space and the second space need to be detected for air tightness respectively.

[0005] In some cases, at least two different test tools need to be used to detect the air tightness of the first space and the second space respectively, so that the cost of air tightness detection of the battery is high.

[0006] SUMMARY

[0007] In view of the above problems, the embodiments of the present application provide a battery, an electric device and an air tightness detection method, which can improve the technical problem of high cost of air tightness detection of the battery.

[0008] In a first aspect, the embodiments of the present application provide a battery, comprising:

[0009] a battery cell;

[0010] a box body, internally provided with a first space, the first space containing the battery cell, and a first box wall of the box body being provided with a through hole;

[0011] a protection plate connected to the outside of the box body and forming a second space with the first box wall; the second space being capable of being communicated with the first space through the through hole;

[0012] a sealing structure sealed in the through hole to isolate the first space and the second space from each other.

[0013] The battery provided by the embodiments of the present application is characterized in that a through hole is arranged on the first box wall of the box body, so that the first space in the box body can be communicated with the second space formed by the protective plate and the first box wall through the through hole, and the sealing structure can be sealed in the through hole, so that the first space and the second space can be isolated from each other through the sealing structure. In this way, when the air tightness of the battery is detected, the test tool can be matched with the box body first, and the gas is introduced into the first space to detect the air tightness of the first space. Then, the protective plate is connected to the outside of the box body, so that the second space is communicated with the first space through the through hole, and the gas is continuously introduced into the first space to detect the air tightness of the first space and the second space, so as to obtain the air tightness of the second space. Then, the sealing structure is sealed in the through hole, so that the first space and the second space are isolated from each other through the sealing structure. In this way, only one set of test tool is matched with the box body, and the air tightness of the first space and the second space can be detected, without the need for two different sets of test tools, so that the cost of air tightness detection of the battery can be reduced.

[0014] In some embodiments, the sealing structure comprises:

[0015] The fixing member is arranged in the through hole and fixed to the first box wall.

[0016] The sealing member is arranged at the connection between the fixing member and the first box wall.

[0017] By arranging the fixing member in the through hole and fixing it to the first box wall, and arranging the sealing member at the connection between the fixing member and the first box wall, the fixing member and the sealing member can cooperate to block the through hole to seal the through hole, thereby effectively isolating the first space and the second space.

[0018] In some embodiments, the at least one sealing member is a first sealing ring; the first sealing ring is arranged on the part of the fixing member located in the through hole and abuts between the outer peripheral wall of the fixing member and the inner peripheral wall of the through hole.

[0019] In this way, the fixing member and the first sealing ring jointly block the through hole to effectively isolate the first space and the second space.

[0020] In some embodiments, the fixing member comprises:

[0021] The fixing part is arranged in the through hole and fixed to the first box wall.

[0022] The limiting part is connected to the fixing part along the penetrating direction of the through hole, and the limiting part is located on the side of the first box wall away from the protective plate.

[0023] The at least one sealing member is arranged between the limiting part and the first box wall; and / or the at least one sealing member is arranged between the fixing part and the first box wall.

[0024] The fixing part is provided with a fixing portion and a limiting portion, and the limiting portion is located on the side of the first box wall away from the protective plate along the through direction of the through hole, so that the fixing stability of the fixing part on the first box wall is improved, the sealing effect of the sealing structure on the through hole is maintained, and effective isolation between the first space and the second space is achieved.

[0025] In some embodiments, the at least one sealing member is a second sealing ring; the second sealing ring is sleeved on the outer periphery of the fixing portion and elastically abuts between the limiting portion and the first box wall along the through direction of the through hole.

[0026] In this way, the limiting portion and the first box wall extrude the second sealing ring along the through direction of the through hole, so that the second sealing ring is compressed to achieve the sealing effect between the limiting portion and the first box wall, thereby sealing the through hole.

[0027] In some embodiments, the sealing structure further comprises a gasket sleeved on the outer periphery of the fixing portion; along the through direction of the through hole, the gasket is arranged on the side of the limiting portion close to the first box wall, and the second sealing ring elastically abuts between the gasket and the first box wall.

[0028] In this way, one end of the second sealing ring away from the first box wall along the through direction of the through hole can abut against the gasket with a large area, so that it can be uniformly and evenly compressed, which helps to improve the sealing effect of the second sealing ring.

[0029] In some embodiments, the first box wall comprises a wall body and a boss, and the wall body is connected to the outer periphery of the boss; the through hole is arranged on the boss; along the through direction of the through hole, the boss protrudes from the side of the wall body away from the protective plate, and the limiting portion is located on the side of the boss away from the protective plate; the second sealing ring is sleeved on the outer periphery of the boss.

[0030] By arranging the boss, the boss can position the second sealing ring. In this way, during the process of sealing the through hole by the sealing structure, the second sealing ring can be sleeved on the outer periphery of the boss first, then the fixing part is passed through the through hole and fixed to the first box wall, so that the sealing structure is conveniently sealed in the through hole.

[0031] In some embodiments, the at least one sealing member is a sealing adhesive layer; along the through direction of the through hole, the sealing adhesive layer is connected to the side of the first box wall away from the protective plate; the sealing adhesive layer is also connected to the outer peripheral wall of the limiting portion.

[0032] In this way, the sealing adhesive layer can achieve the sealing effect between the limiting portion and the first box wall, so as to effectively isolate the first space and the second space.

[0033] In some embodiments, the sealing structure further comprises a fastener; along the through direction of the through hole, the fastener is located on the side of the first box wall close to the protective plate; the fixing part is fixed to the fastener.

[0034] In this way, the fixing member can cooperate with the sealing member to block the through hole, so as to realize the sealing of the through hole and the effective isolation between the first space and the second space.

[0035] In some embodiments, the fixing member and the fastener are threadedly connected.

[0036] By adopting the above technical solution, the fixing member can be fixed to the first box wall by being screwed into the through hole, so that the fixing operation of the sealing structure on the first box wall is very simple and can be disassembled.

[0037] In some embodiments, the fastener is fixed to the first box wall.

[0038] By fixing the fastener to the first box wall, only the fixing member needs to be screwed into the through hole during the sealing process of the sealing structure, and the fixing member can be fixed to the first box wall. In this way, the fixing member can be fixed to the first box wall.

[0039] In some embodiments, the fixing member is detachably fixed to the first box wall.

[0040] By detachably fixing the fixing member to the first box wall, the sealing effect of the sealing structure can be detected.

[0041] In some embodiments, the fixing part includes a first fixing segment and a second fixing segment; the limiting part, the first fixing segment and the second fixing segment are sequentially connected along the through direction of the through hole, and the first fixing segment is located in the through hole; the outer diameter of the limiting part and the outer diameter of the second fixing segment are both greater than the hole diameter of the through hole, and the limiting part and the second fixing segment are respectively limited on opposite sides of the first box wall.

[0042] In this way, the fixing of the fixing member on the first box wall can be improved, so that the fixing member and the sealing member can stably maintain the sealing effect on the through hole, so as to realize the effective isolation between the first space and the second space.

[0043] In some embodiments, the battery further includes a thermal management component, which is arranged in the second space and is in thermal conductive connection with the battery monomer to regulate the temperature of the battery monomer.

[0044] By adopting the above technical solution, the second space can protect the thermal management component.

[0045] In a second aspect, the embodiments of the present application provide a power consumption device, which includes a battery for providing electric energy.

[0046] The power consumption device provided by the embodiments of the present application can reduce the cost of the air tightness detection of the battery by adopting the above-mentioned battery.

[0047] In a third aspect, the embodiments of the present application provide a method for detecting air tightness, applied to a battery, comprising:

[0048] introducing gas into the first space of the box, and detecting air tightness of the first space;

[0049] connecting the protective plate to the outside of the box, so that the second space formed by the protective plate and the first box wall of the box is communicated with the first space through the through hole on the first box wall;

[0050] introducing gas into the first space, and detecting air tightness of the first space and the second space;

[0051] sealing the sealing structure in the through hole, so that the first space and the second space are isolated from each other through the sealing structure.

[0052] The method for detecting air tightness provided by the embodiments of the present application can realize air tightness detection of the first space and the second space by only cooperating the test tool with the box, without the need for two different test tools, thereby reducing the cost of air tightness detection of the battery.

[0053] In some embodiments, after introducing gas into the first space of the box and detecting air tightness of the first space, before connecting the protective plate to the outside of the box so that the second space formed by the protective plate and the first box wall of the box is communicated with the first space through the through hole on the first box wall, the method comprises:

[0054] opening the through hole on the first box wall.

[0055] In this way, the through hole is opened on the box wall after the air tightness detection operation of the first space is completed, so that the sealing and plugging operation of the through hole is not needed, and the air tightness detection operation of the first space is very simple.

[0056] In some embodiments, before introducing gas into the first space of the box and detecting air tightness of the first space, the method comprises:

[0057] opening the through hole on the first box wall.

[0058] In this way, the through hole can be opened on the box wall first, and the air tightness detection can be performed after the box is cleaned, so that the problem that debris generated after the through hole is opened affects the use of the first space and the second space can be improved.

[0059] In some embodiments, the sealing structure is sealed in the through hole, so that the first space and the second space are isolated from each other through the sealing structure, comprising:

[0060] sealing the sealing structure in the through hole;

[0061] introducing gas into the first space, and detecting air tightness of the first space.

[0062] By adopting the technical scheme, the air tightness of the first space, the second space and the sealing structure is detected, and only one set of test tooling is required, so that the air tightness detection cost of the battery can be reduced.

[0063] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or exemplary technical description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0065] Fig. 1 is a schematic view of a vehicle according to some embodiments of the present application;

[0066] Fig. 2 is an exploded schematic view of a battery according to some embodiments of the present application;

[0067] Fig. 3 is a partial schematic view of a battery according to some embodiments of the present application;

[0068] Fig. 4 is an exploded schematic view of Fig. 3;

[0069] Fig. 5 is a partial sectional view of Fig. 3 along A-A;

[0070] Fig. 6 is a partial sectional view of a battery according to some other embodiments of the present application;

[0071] Fig. 7 is a partial schematic view of a battery according to some further embodiments of the present application;

[0072] Fig. 8 is a partial sectional view of Fig. 7 along B-B;

[0073] Fig. 9 is a method flowchart of an air tightness detection method according to some embodiments of the present application;

[0074] Fig. 10 is a method flowchart of an air tightness detection method according to some other embodiments of the present application;

[0075] Fig. 11 is a method flowchart of an air tightness detection method according to some further embodiments of the present application.

[0076] In the drawings, various reference numerals refer to various identical or similar elements.

[0077] 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - box body; 201 - first space; 202 - through hole; 21 - first part; 211 - first box wall; 2111 - wall body; 2112 - boss; 212 - peripheral wall; 22 - second part; 30 - protection plate; 40 - thermal management component; 50 - sealing structure; 51 - fixing piece; 511 - fixing part; 5111 - first fixing section; 5112 - second fixing section; 512 - limiting part; 52 - sealing piece; 52a - first sealing ring; 52b - second sealing ring; 52c - sealing adhesive layer; 53 - gasket; 54 - fastener; 60 - second space; Z - first direction. DETAILED DESCRIPTION

[0078] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0079] If not specifically stated, all embodiments and optional embodiments of the embodiments of the present application can be combined with each other to form new technical solutions.

[0080] If not specifically stated, all technical features and optional technical features of the embodiments of the present application can be combined with each other to form new technical solutions.

[0081] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0082] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0083] In the description of the embodiments of the present application, the meaning of "multiple" is more than two, and "more than two" includes two, unless otherwise specifically limited. Accordingly, the meaning of "multiple groups" is more than two groups, including two groups.

[0084] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also 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 meanings of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the description of the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent: there is A, there are A and B, and there is B. In addition, in the present application, the character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0086] Although the present application has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be substituted without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0087] In the related art, a battery can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that there are both series and parallel connections among the multiple battery cells.

[0088] The battery can include a battery cell, a case, a protection plate, and a thermal management component. The case has a first space, and the battery cell is accommodated in the first space. The protection plate is connected to the case and forms a second space with the outer wall of the case. The thermal management component is arranged in the second space. Understandably, the first space refers to a space of the battery for accommodating the battery cell to protect the battery cell. The second space refers to a space of the battery for accommodating the thermal management component to protect the thermal management component.

[0089] To improve the reliability of the battery, it is generally necessary to ensure the air tightness of the first space and the second space to a certain extent to achieve air tightness protection of the battery cell, the thermal management component, and the like. Based on this, before the battery is produced, the air tightness of the first space and the second space needs to be detected respectively.

[0090] When the first space is subjected to the air tightness detection, the detection tool needs to be used in cooperation with the box. When the second space is subjected to the air tightness detection, the detection tool needs to be used in cooperation with the protection plate. Due to the different structures of the box and the protection plate, and the different positions of the box and the protection plate during the air tightness detection of the battery, the position of the gas inlet of the box for passing in the gas and the position of the gas inlet of the protection plate for passing in the gas are also different. Therefore, two different detection tools are needed to be used to detect the air tightness of the first space and the second space respectively.

[0091] In some cases, the air tightness detection operation of the battery can be:

[0092] First, the first detection tool is used in cooperation with the box, and the first detection tool is used to pass in the gas into the first space to detect the air tightness of the first space.

[0093] Then, the second detection tool is used in cooperation with the protection plate, and the second detection tool is used to pass in the gas into the second space to detect the air tightness of the second space.

[0094] In the process of air tightness detection of the battery, the box can be located below the protection plate.

[0095] When the first space is subjected to the air tightness detection, the first detection tool cooperates with the box, which can be that the first detection tool presses upward against the box to seal the gas inlet on the box. In this way, the first detection tool can be used to pass in the gas into the gas inlet to pass the gas into the first space.

[0096] When the second space is subjected to the air tightness detection, the second detection tool cooperates with the protection plate, which can be that the second detection tool presses downward against the protection plate to seal the gas inlet on the protection plate. In this way, the second detection tool can be used to pass in the gas into the gas inlet to pass the gas into the second space.

[0097] The above, at least two different test tools need to be used to detect the air tightness of the battery, so that the cost of the air tightness detection of the battery is high.

[0098] Based on the above considerations, the embodiments of the present application provide a battery, an electric device and a gas tightness detection method. A through hole is arranged on the first box wall of the box body, so that the first space in the box body can be communicated with the second space formed by the protective plate and the first box wall through the through hole, and the sealing structure can be sealed in the through hole, so that the first space and the second space can be isolated from each other by the sealing structure. In this way, when the gas tightness of the battery is detected, the test tool can be matched with the box body, and the gas can be introduced into the first space to detect the gas tightness of the first space. Then, the protective plate is connected to the outside of the box body, so that the second space is communicated with the first space through the through hole, and the gas is continuously introduced into the first space to detect the gas tightness of the first space and the second space, so as to obtain the gas tightness of the second space. Then, the sealing structure is sealed in the through hole, so that the first space and the second space are isolated from each other by the sealing structure. In this way, only one set of test tool is matched with the box body, and the gas tightness detection of the first space and the second space can be realized, without the need for two different test tools, so that the cost of the gas tightness detection of the battery can be reduced.

[0099] In some embodiments, the battery related to the embodiments of the present application can be used in an electric device using the battery as a power source.

[0100] The electric device related to the embodiments of the present application 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, a vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc. According to the power source, the vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid electric car or a range extended car, etc. According to the driving mode, the vehicle can be a front-wheel drive car, a rear-wheel drive car or an all-wheel drive car.

[0101] In other embodiments, the battery related to the embodiments of the present application can be used in an energy storage system using the battery as an energy storage element. The energy storage system can include an energy storage container, an energy storage cabinet, etc.

[0102] For ease of description, the embodiments of the present application take the electric device as a vehicle as an example for description.

[0103] In some embodiments, referring to FIG. 1, which is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 is internally provided with the battery 100 described above, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0104] In some embodiments, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0105] In some embodiments, referring to FIG. 2, and in combination with other drawings. FIG. 2 is an exploded schematic diagram of the battery 100 according to some embodiments of the present application. The battery 100 can include a box 20 and a plurality of battery cells 10. The box 20 is a structure with an internal space, and the internal space of the box 20 is a first space 201, which is used to accommodate the battery cells 10.

[0106] The box 20 can adopt various structures. In some embodiments, the box 20 can include a first part 21 and a second part 22, which are mutually covered and jointly define the first space 201. Referring to FIG. 2, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 can be a plate structure, which is covered on the opening side of the first part 21 to jointly define the first space 201 with the first part 21. Alternatively, the first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the opening side of the first part 21 is covered on the opening side of the second part 22 to jointly define the first space 201.

[0107] The box 20 composed of the first part 21 and the second part 22 can have various shapes, such as a cylinder, a cuboid, etc.

[0108] In some embodiments, referring to FIG. 2, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the plurality of battery cells 10 is directly accommodated in the first space 201 of the case 20. In other embodiments, the plurality of battery cells 10 can be first connected in series, in parallel, or in a mixed connection, and then arranged and fixed to form a battery module, and the battery module is accommodated in the first space 201 of the case 20. In yet other embodiments, the plurality of battery cells 10 can be first connected in series, in parallel, or in a mixed connection, and then arranged and fixed to form a plurality of battery modules, and the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then the whole is accommodated in the first space 201 of the case 20.

[0109] As an example, the plurality of battery cells 10 can be fixed to form a battery module by a cable tie or the like.

[0110] As an example, the plurality of battery cells 10 can be fixed to form a battery module by an end plate, a side plate, or the like.

[0111] In some embodiments, the case 20 of the battery 100 can be part of a chassis structure of the vehicle 1000. For example, part of the case 20 can be at least part of the chassis of the vehicle 1000, or part of the case 20 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0112] The battery cell 10 referred to in the embodiments of the present application refers to the smallest unit that stores and outputs electric energy. The battery cell 10 can be a secondary battery or a primary battery. The battery cell 10 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0113] Referring to FIGS. 3 to 5, and in combination with other drawings. FIG. 3 is a partial schematic view of a battery 100 provided by some embodiments of the present application, FIG. 4 is an exploded schematic view of FIG. 3, and FIG. 5 is a partial sectional view of FIG. 3 along A-A. The battery 100 provided by the embodiments of the present application includes a battery cell 10, a case 20, a protective plate 30, and a sealing structure 50. The case 20 is provided with a first space 201, and the first space 201 contains the battery cell 10 described above. The case 20 is provided with a first case wall 211, and the first case wall 211 of the case 20 is provided with a through hole 202. The protective plate 30 is connected to the outside of the case 20, and surrounds the first case wall 211 of the case 20 to form a second space 60. The second space 60 can be communicated with the first space 201 through the through hole 202. The sealing structure 50 is sealed to the through hole 202 to isolate the first space 201 and the second space 60 from each other.

[0114] Specifically, the box body 20 has a plurality of box walls, and the plurality of box walls of the box body 20 surround to form a first space 201. At least one box wall of the box body 20 is formed with a through hole 202, and the box wall of the box body 20 provided with the through hole 202 is a first box wall 211. Among them, the first space 201 refers to a space of the battery 100 for accommodating components such as battery monomers 10.

[0115] The protective plate 30 refers to a structure for jointly protecting components such as the heat management component 40 with the box body 20. Specifically, the protective plate 30 is located at the bottom of the box body 20, and is connected to the outside of the box body 20, and surrounds with the first box wall 211 of the box body 20 to form a second space 60, and the second space 60 is used to accommodate components such as the heat management component 40, so as to realize the protection effect of the heat management component 40 and the like.

[0116] In the case that the protective plate 30 is connected to the outside of the box body 20 to surround with the first box wall 211 of the box body 20 to form the second space 60, and the sealing structure 50 does not seal the through hole 202, the through hole 202 is communicated with the first space 201 and the second space 60, so that the second space 60 is communicated with the first space 201 through the through hole 202.

[0117] In the case that the protective plate 30 is connected to the outside of the box body 20 to surround with the first box wall 211 of the box body 20 to form the second space 60, and the sealing structure 50 seals the through hole 202, the sealing structure 50 makes the first space 201 and the second space 60 isolated from each other.

[0118] Among them, the isolation between the first space 201 and the second space 60 can include at least one of gas isolation and liquid isolation, so that the first space 201 and the second space 60 can independently protect the corresponding components without interfering with each other. Taking the battery monomer 10 arranged in the first space 201 and the heat management component 40 arranged in the second space 60 as an example: in the case of leakage of the heat management component 40, the sealing structure 50 makes the first space 201 and the second space 60 isolated from each other, which can improve the problem that the leakage of the heat management component 40 causes the short circuit of the battery monomer 10 and the like. In addition, the sealing structure 50 makes the first space 201 and the second space 60 isolated from each other, which can also improve the problem that the communication between the first space 201 and the second space 60 causes the corrosion of the heat management component 40.

[0119] The battery 100 provided by the embodiments of the present application can be used to realize the airtightness detection of the first space 201 and the second space 60. The first space 201 can be connected to the second space 60 through the through hole 202 in the first box wall 211 of the box 20, and the sealing structure 50 can be sealed in the through hole 202, so that the first space 201 and the second space 60 can be isolated from each other through the sealing structure 50. In this way, when the airtightness of the battery 100 is detected, the test tool can be used to cooperate with the box 20, and the gas is introduced into the first space 201 to detect the airtightness of the first space 201, and the first airtightness detection result is obtained. In the case that the first airtightness detection result meets the standard, the protective plate 30 is connected to the outside of the box 20, so that the second space 60 surrounded by the protective plate 30 and the first box wall 211 of the box 20 is connected to the first space 201 through the through hole 202 on the first box wall 211. Continue to introduce gas into the first space 201 to detect the airtightness of the first space 201 and the second space 60, and obtain the second airtightness detection result. Since the first airtightness detection result meets the standard, the airtightness of the second space 60 can be obtained through the second airtightness detection result. In the case that the second airtightness detection result meets the standard, the sealing structure 50 is sealed in the through hole 202, so that the first space 201 and the second space 60 are isolated from each other through the sealing structure 50. In this way, only one set of test tool is needed to cooperate with the box 20 to realize the airtightness detection of the first space 201 and the second space 60, without the need for two different test tools, thereby reducing the cost of airtightness detection of the battery 100.

[0120] It can be understood that the airtightness detection of the first space 201 and the second space 60 can be realized by setting the through hole 202 in the first box wall 211 of the box 20. By setting the sealing structure 50, the through hole 202 can be sealed after the airtightness detection operation is completed, so that the effective isolation between the first space 201 and the second space 60 can be realized. In this way, after the battery 100 is formed by the box 20, the protective plate 30 and the like, the first space 201 and the second space 60 can be isolated from each other to realize normal protection work.

[0121] In addition, after the airtightness detection of the first space 201 and the second space 60 is realized, the sealing structure 50 can be placed in the first space 201 to seal the sealing structure 50 in the through hole 202. In this way, the sealing structure 50 is located in the first space 201, rather than outside the box 20, so that the sealing structure 50 is not easy to be damaged, and the sealing effect of the through hole 202 can be maintained, thereby effectively maintaining the effective isolation between the first space 201 and the second space 60.

[0122] For ease of description, the through direction of the through hole 202 is defined as the first direction Z. In FIGS. 3 and 4, a spatial coordinate system is established, respectively, and the X-axis, the Y-axis and the Z-axis are three coordinate axes of the spatial coordinate system, the X-axis and the Y-axis are perpendicular, the X-axis and the Z-axis are perpendicular, and the Y-axis and the Z-axis are perpendicular. The Z-axis is parallel to the first direction Z.

[0123] In some examples, the first direction Z can be parallel to the height direction of the battery 100, the X-axis can be parallel to the length direction of the battery 100, and the Y-axis can be parallel to the width direction of the battery 100.

[0124] As shown in FIGS. 3 and 4, the through hole 202 is arranged on the first part 21 of the box body 20. Specifically, the first part 21 of the box body 20 can include a first box wall 211 and a peripheral wall 212 connected to the four peripheral edges of the first box wall 211 to form a hollow structure with an opening at one end with the first box wall 211. Specifically, the opening of the hollow structure is arranged at one end of the peripheral wall 212 away from the first box wall 211 along the first direction Z, and the second part 22 of the box body 20 is arranged at one end of the peripheral wall 212 away from the first box wall 211 along the first direction Z to cover the opening. In this way, the second part 22, the first box wall 211 and the peripheral wall 212 form the first space 201.

[0125] In some embodiments, please refer to FIGS. 3 to 5, and combine with other drawings. The sealing structure 50 includes a fixing member 51 and a sealing member 52. The fixing member 51 is arranged through the through hole 202 and fixed to the first box wall 211. The sealing member 52 is arranged at the connection between the fixing member 51 and the first box wall 211.

[0126] The fixing member 51 refers to a component for being arranged through the through hole 202 and fixed to the first box wall 211. Specifically, the fixing member 51 is arranged through the through hole 202 along the first direction Z and fixed to the first box wall 211. The fixing member 51 can be, but is not limited to, a bolt, a rivet or the like which can be fixed to the first box wall 211.

[0127] The sealing member 52 refers to a component with sealing performance. Specifically, the sealing member 52 is arranged at the connection between the fixing member 51 and the first box wall 211, so that the sealing member 52 can seal the connection between the fixing member 51 and the first box wall 211. The sealing member 52 can be, but is not limited to, a rubber ring, a silica gel ring, a sealing glue layer 52c or the like.

[0128] By arranging the fixing member 51 through the through hole 202 and fixed to the first box wall 211, and arranging the sealing member 52 at the connection between the fixing member 51 and the first box wall 211, the fixing member 51 and the sealing member 52 can cooperate to block the through hole 202 to seal the through hole 202, thereby achieving effective isolation between the first space 201 and the second space 60.

[0129] After the air tightness detection operation of the first space 201 and the second space 60 is implemented, the fixing member 51 can be put into the first space 201, and the fixing member 51 is passed through the through hole 202 from the side of the first box wall 211 away from the protective plate 30, so that the fixing member 51 and the sealing member 52 cooperate to block the through hole 202, and effective isolation between the first space 201 and the second space 60 is achieved.

[0130] In other embodiments, the sealing structure 50 can cover at least one side of the first box wall 211 along the through direction of the through hole 202.

[0131] In other embodiments, please refer to FIG. 6, and combine with other drawings. FIG. 6 is a partial sectional view of the battery 100 provided by other embodiments of the application. The at least one sealing member 52 is a first sealing ring 52a. The first sealing ring 52a is sleeved on the part of the fixing member 51 located in the through hole 202, and abuts between the outer peripheral wall of the fixing member 51 and the inner peripheral wall of the through hole 202.

[0132] The first sealing ring 52a can be, but is not limited to, a rubber ring or a silica gel ring.

[0133] The fixing member 51 is passed through the through hole 202, so that at least part of the fixing member 51 is located in the through hole 202.

[0134] The fixing member 51 includes a fixing portion 511, which is the part of the fixing member 51 located in the through hole 202. The first sealing ring 52a is sleeved on the outer periphery of the fixing portion 511.

[0135] The first sealing ring 52a abutting between the outer peripheral wall of the fixing member 51 and the inner peripheral wall of the through hole 202 means that the first sealing ring 52a is arranged between the outer peripheral wall of the fixing portion 511 and the inner peripheral wall of the through hole 202, and the outer peripheral wall of the first sealing ring 52a abuts against the inner peripheral wall of the through hole 202, and the inner peripheral wall of the first sealing ring 52a abuts against the outer peripheral wall of the fixing portion 511.

[0136] In this way, the fixing member 51 and the first sealing ring 52a jointly block the through hole 202, so as to achieve effective isolation between the first space 201 and the second space 60.

[0137] In some embodiments, please refer to FIGS. 3-6, and combine with other drawings. The fixing member 51 includes a fixing portion 511 and a limiting portion 512. The fixing portion 511 is passed through the through hole 202 and fixed to the first box wall 211. Along the through direction of the through hole 202, the fixing portion 511 and the limiting portion 512 are connected, and the limiting portion 512 is limited to the side of the first box wall 211 away from the protective plate 30.

[0138] The fixing portion 511 refers to the portion of the fixing member 51 located in the through hole 202, and the limiting portion 512 refers to the portion of the fixing member 51 used for limiting the first cabinet wall 211 away from the side of the protective plate 30 along the through direction of the through hole 202.

[0139] In some possible designs, as shown in FIG. 5, at least one sealing member 52 is arranged between the limiting portion 512 and the first cabinet wall 211. The sealing member 52 can be, but is not limited to, the second sealing ring 52b and the sealing glue layer 52c mentioned below.

[0140] In another possible design, as shown in FIG. 6, at least one sealing member 52 is arranged between the fixing portion 511 and the first cabinet wall 211. Specifically, the sealing member 52 can be the first sealing ring 52a mentioned above, which is sleeved on the outer periphery of the fixing portion 511 and abuts between the outer peripheral wall of the fixing portion 511 and the inner peripheral wall of the through hole 202.

[0141] By arranging the fixing member 51 to include the fixing portion 511 and the limiting portion 512, and limiting the limiting portion 512 to the side of the first cabinet wall 211 away from the protective plate 30 along the through direction of the through hole 202, the fixing stability of the fixing member 51 on the first cabinet wall 211 can be improved, so that the sealing effect of the sealing structure 50 on the through hole 202 can be maintained, and the effective isolation between the first space 201 and the second space 60 can be achieved.

[0142] In addition, by limiting the limiting portion 512 to the side of the first cabinet wall 211 away from the protective plate 30 along the through direction of the through hole 202, the limiting portion 512 can abut against the end of the first sealing ring 52a away from the protective plate 30, so that the effect of the first sealing ring 52a abutting between the outer peripheral wall of the fixing portion 511 and the inner peripheral wall of the through hole 202 can be maintained, and the first sealing ring 52a and the fixing member 51 can jointly seal the through hole 202, so that the effective isolation between the first space 201 and the second space 60 can be achieved.

[0143] In some embodiments, please refer to FIGS. 3-5, and other drawings. The at least one sealing member 52 is the second sealing ring 52b. The second sealing ring 52b is sleeved on the outer periphery of the fixing portion 511 and elastically abuts between the limiting portion 512 and the first cabinet wall 211 along the through direction of the through hole 202.

[0144] The second sealing ring 52b can be, but is not limited to, a silica gel ring or a rubber ring.

[0145] The second sealing ring 52b elastically abuts between the limiting portion 512 and the first cabinet wall 211 along the through direction of the through hole 202, that is, the second sealing ring 52b is located between the limiting portion 512 and the first cabinet wall 211 along the through direction of the through hole 202, and an end of the second sealing ring 52b close to the first cabinet wall 211 elastically abuts against a side of the first cabinet wall 211 away from the protective plate 30, and an end of the second sealing ring 52b away from the first cabinet wall 211 elastically abuts against the limiting portion 512.

[0146] In this way, the limiting portion 512 and the first cabinet wall 211 extrude the second sealing ring 52b along the through direction of the through hole 202, so that the second sealing ring 52b is compressed to achieve the sealing effect between the limiting portion 512 and the first cabinet wall 211, thereby achieving the sealing of the through hole 202.

[0147] In addition, by extruding the second sealing ring 52b by the limiting portion 512 and the first cabinet wall 211, the second sealing ring 52b can be firmly fixed between the fixing member 51 and the first cabinet wall 211 to stably achieve the sealing effect between the fixing member 51 and the first cabinet wall 211.

[0148] In some embodiments, please refer to FIGS. 3-5, and combine with other drawings. The sealing structure 50 further comprises a gasket 53 surrounding the outer periphery of the fixing portion 511. Along the through direction of the through hole 202, the gasket 53 is arranged on a side of the limiting portion 512 close to the first cabinet wall 211, and the second sealing ring 52b elastically abuts between the gasket 53 and the first cabinet wall 211.

[0149] The gasket 53 refers to a component for transmitting the abutting force of the limiting portion 512 to the second sealing ring 52b. The gasket 53 can be a metal sheet, a plastic sheet, etc.

[0150] The second sealing ring 52b elastically abuts between the gasket 53 and the first cabinet wall 211, that is, an end of the second sealing ring 52b close to the first cabinet wall 211 elastically abuts against the first cabinet wall 211, and an end of the second sealing ring 52b away from the first cabinet wall 211 elastically abuts against the gasket 53.

[0151] The gasket 53 is arranged on the side of the limiting portion 512 close to the first cabinet wall 211 along the through direction of the through hole 202, and the second sealing ring 52b is elastically abutted between the gasket 53 and the first cabinet wall 211. Thus, along the through direction of the through hole 202, the side of the gasket 53 away from the first cabinet wall 211 is abutted against the limiting portion 512, and the side of the gasket 53 close to the first cabinet wall 211 is abutted against the second sealing ring 52b, that is, the gasket 53 is abutted between the limiting portion 512 and the second sealing ring 52b. In this way, the gasket 53 can transmit the abutting force of the limiting portion 512 to the second sealing ring 52b, so that the second sealing ring 52b is compressed to realize the sealing effect between the limiting portion 512 and the first cabinet wall 211. Moreover, the gasket 53 is arranged such that the end of the second sealing ring 52b away from the first cabinet wall 211 along the through direction of the through hole 202 can abut against the gasket 53 with a large area, so that the second sealing ring 52b can be uniformly and evenly compressed, which helps to improve the sealing effect of the second sealing ring 52b.

[0152] In some embodiments, please refer to FIGS. 3-5, and other drawings. The first cabinet wall 211 includes a wall body 2111 and a boss 2112, and the wall body 2111 is connected to the outer periphery of the boss 2112. The through hole 202 is arranged on the boss 2112. Along the through direction of the through hole 202, the boss 2112 protrudes from the side of the wall body 2111 away from the protective plate 30. Along the through direction of the through hole 202, the limiting portion 512 is limited on the side of the boss 2112 away from the protective plate 30. The second sealing ring 52b is sleeved on the outer periphery of the boss 2112.

[0153] The wall body 2111 is the main part of the first cabinet wall 211, and the boss 2112 is the part of the first cabinet wall 211 on which the through hole 202 is arranged.

[0154] The through hole 202 arranged on the boss 2112 means that the through hole 202 penetrates the boss 2112.

[0155] It can be understood that along the through direction of the through hole 202, the fixing portion 511 of the fixing member 51 is arranged in the through hole 202, so that the boss 2112 surrounds the outer periphery of the fixing portion 511. Moreover, the second sealing ring 52b is sleeved on the outer periphery of the boss 2112. Along the through direction of the through hole 202, the limiting portion 512 is limited on the side of the boss 2112 away from the protective plate 30, and elastically abuts against the end of the second sealing ring 52b away from the protective plate 30.

[0156] By arranging the boss 2112, the boss 2112 can position the second sealing ring 52b. In this way, in the process of sealing the through hole 202 by the sealing structure 50, the second sealing ring 52b can be sleeved on the outer periphery of the boss 2112 first, and then the fixing member 51 is arranged in the through hole 202 to be fixed to the first cabinet wall 211, so that the sealing structure 50 is conveniently sealed to the through hole 202.

[0157] Further, the limiting portion 512 can be limited to the side of the boss 2112 away from the protective plate 30, so that the boss 2112 can position the fixing member 51. For example, after the air tightness detection operation of the first space 201 and the second space 60 is implemented, in the process of sealing the through hole 202 by the sealing structure 50, the second sealing ring 52b can be sleeved on the outer periphery of the boss 2112 first, and then the fixing member 51 can pass through the through hole 202 until the limiting portion 512 abuts against the side of the boss 2112 away from the protective plate 30. In this way, the installation operation of the sealing structure 50 on the first cabinet wall 211 is very simple and easy to implement.

[0158] Further, by limiting the limiting portion 512 to the side of the boss 2112 away from the protective plate 30, the problem that the sealing effect of the second sealing ring 52b is invalidated due to excessive compression of the limiting portion 512 to the second sealing ring 52b can be improved.

[0159] The fixing portion 511 of the fixing member 51 passes through the through hole 202 and is fixed to the first cabinet wall 211, which can be fixed to the wall body 2111 of the first cabinet wall 211 or the boss 2112 of the first cabinet wall 211.

[0160] In some embodiments, please refer to FIGS. 3-5, and combine with other drawings. Along the through direction of the through hole 202, the gasket 53 abuts between the boss 2112 and the limiting portion 512. In this way, the gasket 53 will not excessively extrude the second sealing ring 52b, and the problem that the sealing effect of the second sealing ring 52b is invalidated due to excessive compression of the second sealing ring 52b can be improved. In addition, by the arrangement of the gasket 53, the area of the second sealing ring 52b in contact with the gasket 53 can be increased, so that the second sealing ring 52b can be more evenly compressed to achieve a higher sealing effect. Further, the arrangement of the gasket 53 can also protect the boss 2112 and the limiting portion 512 to some extent, and the problem that the limiting portion 512 and the boss 2112 are damaged due to mutual extrusion can be improved.

[0161] In some embodiments, please refer to FIGS. 7 and 8, and combine with other drawings. FIG. 7 is a partial schematic view of the battery 100 provided in some other embodiments of the present application, and FIG. 8 is a partial sectional view of FIG. 7 along B-B. The at least one sealing member 52 is a sealing glue layer 52c. Along the through direction of the through hole 202, the sealing glue layer 52c is connected to the side of the first cabinet wall 211 away from the protective plate 30. The sealing glue layer 52c is also connected to the outer peripheral wall of the limiting portion 512.

[0162] The sealing glue layer 52c refers to a structure formed by solidification of sealing glue.

[0163] As shown in FIGS. 7 and 8, the sealant layer 52c covers the side of the first tank wall 211 away from the guard plate 30 along the through direction of the through hole 202, and covers the outer circumferential wall of the limiting portion 512, so that the sealant layer 52c can cover the gap between the limiting portion 512 and the first tank wall 211.

[0164] In this way, the sealant layer 52c can achieve the sealing effect between the limiting portion 512 and the first tank wall 211, so as to effectively isolate the first space 201 and the second space 60.

[0165] Based on the above structure, as shown in FIGS. 7 and 8, after the air tightness detection operation of the first space 201 and the second space 60 is implemented, in the process of sealing the sealing structure 50 to the through hole 202, the sealant can be coated on the side of the first tank wall 211 away from the guard plate 30 along the through direction of the through hole 202, close to the limiting portion 512, and the sealant covers the outer circumferential wall of the limiting portion 512. After the sealant solidifies, the sealant layer 52c is formed, which covers the gap between the limiting portion 512 and the first tank wall 211, and is connected to the first tank wall 211 and the limiting portion 512.

[0166] In some embodiments, please refer to FIGS. 3 to 5, and combine with other drawings. The sealing structure 50 further includes a fastener 54. The fastener 54 is located on the side of the first tank wall 211 close to the guard plate 30 along the through direction of the through hole 202. The fixing member 51 is fixed to the fastener 54.

[0167] The fastener 54 refers to a component for connecting with the fixing member 51. The fastener 54 can be fixed to the fixing member 51 by clamping, bolt connection or the like. Specifically, the fixing portion 511 of the fixing member 51 is arranged through the through hole 202 and is fixed to the fastener 54.

[0168] By locating the fastener 54 on the side of the first tank wall 211 close to the guard plate 30 along the through direction of the through hole 202, and fixing the fixing member 51 to the fastener 54, the fixing member 51 can be indirectly fixed to the first tank wall 211 through the fastener 54. In this way, the fixing member 51 can cooperate with the sealing member 52 to block and seal the through hole 202, so as to effectively isolate the first space 201 and the second space 60.

[0169] In some embodiments, please refer to FIGS. 3 to 5, and combine with other drawings. The fastener 54 is located on the side of the first tank wall 211 close to the guard plate 30 along the through direction of the through hole 202, the fixing portion 511 of the fixing member 51 is arranged through the through hole 202 to be fixed to the fastener 54, and the fixing member 51 is located on the side of the first tank wall 211 away from the guard plate 30. In this way, the fixing member 51 can be firmly fixed to the first tank wall 211.

[0170] In some embodiments, referring to Figs. 3-5, and in conjunction with other figures, the fixing member 51 is threadedly connected with the fastener 54.

[0171] Specifically, the fastener 54 can be a nut, and the outer circumferential wall of the fixing portion 511 of the fixing member 51 is provided with external threads. The fixing portion 511 of the fixing member 51 is inserted into the through hole 202 to be inserted into the fastener 54, so as to be threadedly connected with the fastener 54.

[0172] By adopting the above technical solution, only the fixing member 51 needs to be screwed into the through hole 202, and the fixing of the fixing member 51 and the first cabinet wall 211 can be achieved, so that the fixing operation of the sealing structure 50 on the first cabinet wall 211 is very simple and can be disassembled.

[0173] In some embodiments, referring to Figs. 3-5, and in conjunction with other figures, the fixing member 51 is detachably fixed to the first cabinet wall 211.

[0174] In this way, after the sealing structure 50 is sealed to the through hole 202, gas can still be introduced into the first space 201 to detect the airtightness of the first space 201 again, and a third airtightness detection result is obtained. If the third airtightness detection result is not up to standard, it means that the sealing effect of the sealing structure 50 on the through hole 202 is not enough, and the sealing structure 50 can be replaced to seal the through hole 202 again, and then the airtightness of the first space 201 is continuously detected... and so on, until the airtightness detection result of the first space 201 is up to standard.

[0175] Therefore, by detachably fixing the fixing member 51 to the first cabinet wall 211, the sealing effect of the sealing structure 50 can be detected.

[0176] In some embodiments, as shown in Figs. 3-5, the fixing member 51 is threadedly connected with the fastener 54, which can achieve detachable fixing between the fixing member 51 and the first cabinet wall 211.

[0177] In some embodiments, referring to Figs. 3-5, and in conjunction with other figures, the fastener 54 is fixed to the first cabinet wall 211.

[0178] The fastener 54 can be fixed to the first cabinet wall 211 by welding, bolt fixing, etc.

[0179] By fixing the fastener 54 to the first cabinet wall 211, only the fixing member 51 needs to be screwed into the through hole 202 during the process of sealing the through hole 202 by the sealing structure 50, and the fixing member 51 can be fixed to the first cabinet wall 211. In this way, the fixing member 51 can be fixed on the first cabinet wall 211.

[0180] In some embodiments, please refer to Figures 7 and 8 together, and in conjunction with other figures. The fixing part 511 includes a first fixing segment 5111 and a second fixing segment 5112. Along the through-hole 202, the limiting part 512, the first fixing segment 5111, and the second fixing segment 5112 are connected in sequence. Along the through-hole 202, the first fixing segment 5111 is located inside the through-hole 202. The outer diameter of the limiting part 512 is larger than the diameter of the through-hole 202, and the outer diameter of the second fixing segment 5112 is larger than the diameter of the through-hole 202. Along the through-hole 202, the limiting part 512 and the second fixing segment 5112 are respectively limited to opposite sides of the first housing wall 211.

[0181] The first fixing section 5111 and the second fixing section 5112 are two sections of the fixing part 511 along the through hole 202.

[0182] Understandably, the outer diameter of the first fixed section 5111 is smaller than the diameter of the through hole 202, so that the first fixed section 5111 passes through the through hole 202.

[0183] The outer diameter of the limiting part 512 is greater than the outer diameter of the first fixing section 5111 and larger than the outer diameter of the through hole 202. The outer diameter of the second fixing section 5112 is greater than the outer diameter of the first fixing section 5111 and larger than the outer diameter of the through hole 202. Thus, when the first fixing section 5111 is located inside the through hole 202, the limiting part 512 and the second fixing section 5112 can be respectively limited to opposite sides of the first housing wall 211.

[0184] After the fixing part 511 passes through the through hole 202, the first fixing section 5111 is located inside the through hole 202, and the limiting part 512 and the second fixing section 5112 can be respectively limited to opposite sides of the first box wall 211 along the through hole 202. In this way, the fixing reliability of the fixing member 51 on the first box wall 211 can be improved, so that the fixing member 51 and the sealing member 52 can stably maintain the sealing effect on the through hole 202, thereby achieving effective isolation between the first space 201 and the second space 60.

[0185] Among them, the fastener 51 can be a rivet.

[0186] In some embodiments, please refer to FIG3, and in conjunction with other figures. The battery 100 also includes a thermal management component 40 disposed within the second space 60. The thermal management component 40 is thermally connected to the battery cell 10 to regulate the temperature of the battery cell 10.

[0187] The thermal management component 40 can be in the form of a plate, a tube, etc.

[0188] The heat management component 40 is internally provided with a flow channel, and a heat management medium can be introduced into the flow channel to perform heat management on the battery monomer 10 in the first space 201. The heat management can be heating or cooling of the battery monomer 10, which is determined based on the temperature of the heat management medium inside the heat management component 40.

[0189] By adopting the above technical solution, the second space 60 can protect the heat management component 40.

[0190] Referring to FIG. 1, the power consumption device provided by the embodiment of the application includes a battery 100 for providing electric energy. The battery 100 in the embodiment is the same as the battery 100 in the previous embodiment, and details are described in the related description of the battery 100 in the previous embodiment, which will not be repeated here.

[0191] The power consumption device provided by the embodiment of the application can reduce the cost of the air tightness detection of the battery 100 by adopting the above-mentioned battery 100.

[0192] Referring to FIG. 9, and in combination with other drawings. FIG. 9 is a method flowchart of an air tightness detection method provided by some embodiments of the application. The embodiment of the application provides an air tightness detection method, which is applied to the battery 100. The battery 100 in the embodiment is the same as the battery 100 in the previous embodiment, and details are described in the related description of the battery 100 in the previous embodiment, which will not be repeated here.

[0193] As shown in FIG. 9, and in combination with other drawings. The air tightness detection method includes the following steps:

[0194] S10, introducing a gas into the first space 201 of the box body 20 to detect the air tightness of the first space 201.

[0195] In this step, the protection plate 30 is not connected to the outside of the box body 20, that is, the second space 60 is not formed by the protection plate 30 and the box body 20.

[0196] In this step, the test tool can be matched with the box body 20, so that the test tool blocks the gas inlet of the box body 20, and the test tool can introduce a gas into the first space 201 of the box body 20 through the gas inlet of the box body 20, so as to detect the air tightness of the first space 201.

[0197] Before the second part 22 of the box body 20 is assembled to the first part 21 of the box body 20, the opening of the first part 21 close to the second part 22 can be used as the gas inlet of the box body 20 for introducing a gas. After the second part 22 of the box body 20 is assembled to the first part 21 of the box body 20, an opening can be provided on the first part 21 or the second part 22 to be used as the gas inlet of the box body 20.

[0198] In this step, after the gas is introduced into the first space 201 of the box 20, the first airtightness detection result can be obtained through the flow of the introduced gas, the volume of the first space 201, the gas pressure in the first space 201, etc. The first airtightness detection result reflects the airtightness of the first space 201.

[0199] S20, connect the protective plate 30 to the outside of the box 20, so that the second space 60 surrounded by the protective plate 30 and the first box wall 211 of the box 20 is communicated with the first space 201 through the through hole 202 on the first box wall 211.

[0200] This step is performed after the first airtightness detection result in step S10 meets the standard. Understandably, if the first airtightness detection result does not meet the standard, it means that the airtightness of the first space 201 is not enough, and the box 20 needs to be replaced or repaired until the first airtightness detection result meets the standard.

[0201] S30, introduce gas into the first space 201 and detect the airtightness of the first space 201 and the second space 60.

[0202] In this step, the cooperation between the test tooling and the box 20 can be continued, that is, the cooperation between the test tooling and the gas inlet on the box 20 is retained.

[0203] In this step, when the gas is introduced into the first space 201 of the box 20, since the second space 60 is communicated with the first space 201 through the through hole 202, the introduced gas can enter the second space 60 from the first space 201, so that the first space 201 and the second space 60 are both filled with gas.

[0204] In this step, after the gas is introduced into the first space 201 of the box 20, the second airtightness detection result can be obtained through the flow of the introduced gas, the volume of the first space 201 and the second space 60, the gas pressure of the first space 201 and the second space 60, etc. Among them, the second airtightness detection result reflects the airtightness of the large space composed of the first space 201 and the second space 60. Since the airtightness of the first space 201 meets the standard, if the second airtightness detection result meets the standard, it means that the airtightness of the second space 60 meets the standard; if the second airtightness detection result does not meet the standard, it means that the airtightness of the second space 60 does not meet the standard.

[0205] S40, seal the sealing structure 50 to the through hole 202, so that the first space 201 and the second space 60 are isolated from each other through the sealing structure 50.

[0206] The step is performed after the second airtightness detection result of step S30 meets the standard. Understandably, if the second airtightness detection result does not meet the standard, it indicates that the airtightness of the second space 60 is not enough, and the protective plate 30 or even the protective plate 30 and the box body 20 needs to be replaced or repaired.

[0207] The airtightness detection method provided by the embodiments of the present application can realize the airtightness detection of the first space 201 and the second space 60 by cooperating the test tool with the box body 20, without the need for two different test tools, thereby reducing the cost of airtightness detection of the battery 100.

[0208] In some embodiments, referring to FIG. 5 and combining other drawings. Step S40 can be specifically: first, the second sealing ring 52b is sleeved on the outer periphery of the boss 2112 of the first box wall 211, and the gasket 53 is sleeved on the outer periphery of the fixing portion 511 of the fixing member 51; then, the fixing portion 511 is inserted through the through hole 202, so that the fixing portion 511 and the first box wall 211 are bolted to the fastener 54 on the side of the first box wall 211 close to the protective plate 30, until the gasket 53 abuts between the boss 2112 away from the protective plate 30 and the limiting portion 512.

[0209] In some embodiments, referring to FIG. 8 and combining other drawings. Step S40 can be specifically: first, the fixing portion 511 of the fixing member 51 is inserted through the through hole 202 until the limiting portion 512 abuts on the side of the first box wall 211 away from the protective plate 30, and then the fixing member 51 and the first box wall 211 are riveted and fixed; then, sealant is coated on the side of the first box wall 211 away from the protective plate 30, and the sealant covers the outer periphery of the limiting portion 512, and the sealant forms a sealant layer 52c after solidification.

[0210] In some embodiments, referring to FIG. 10 and combining other drawings. FIG. 10 is a method flowchart of the airtightness detection method provided by some other embodiments of the present application. After step S10 and before step S20, the following steps are further included:

[0211] S50, a through hole 202 is formed on the first box wall 211.

[0212] In the embodiments, after the airtightness detection operation of the first space 201 is completed, the through hole 202 is formed on the first box wall 211, and then the protective plate 30 is connected to the outside of the box body 20, so that the second space 60 formed by the protective plate 30 and the first box wall 211 is communicated with the first space 201 through the through hole 202.

[0213] In this way, after the airtightness detection operation of the first space 201 is completed, the through hole 202 is formed in the box wall of the box 20, so that in step S10, the through hole 202 does not need to be sealed and plugged, and the airtightness detection operation of the first space 201 is very simple.

[0214] In some embodiments, in step S20, the protective plate 30 can be connected to the outside of the box 20, so that the protective plate 30 and the first box wall 211 form the second space 60, and then the through hole 202 is formed in the first box wall 211.

[0215] Therefore, after the through hole 202 is formed in the first box wall 211, the protective plate 30 is connected to the outside of the box 20, which can improve the problem that the through hole 202 is formed after the protective plate 30 is connected to the outside of the box 20, causing the machining debris to be retained in the second space 60.

[0216] In some embodiments, please refer to FIG. 11, and combine with other drawings. Before step S10, it includes:

[0217] S60, forming the through hole 202 in the first box wall 211 of the box 20.

[0218] It can be understood that before the airtightness detection operation of the first space 201 is performed, the first box wall 211 of the box 20 is provided with the through hole 202. Therefore, when the airtightness detection operation of the first space 201 is performed, the test tool needs to plug the through hole 202, for example, but not limited to, the sealing structure 50 or the test tool can plug the through hole 202.

[0219] In this way, the through hole 202 can be formed in the first box wall 211 of the box 20 first, and then the airtightness detection is performed after the box 20 is cleaned, so that the problem that the debris generated after the through hole 202 is formed affects the use of the first space 201 and the second space 60 can be improved.

[0220] In some embodiments, step S40 specifically includes:

[0221] S41, sealing the sealing structure 50 in the through hole 202.

[0222] S42, introducing gas into the first space 201 to detect the airtightness of the first space 201; after the airtightness of the first space 201 meets the standard, the first space 201 and the second space 60 are isolated from each other through the sealing structure 50.

[0223] It can be understood that after the sealing structure 50 is sealed in the through hole 202, the gas continues to be introduced into the first space 201 to detect the air tightness of the first space 201 again, and a third air tightness detection result is obtained. The third air tightness detection result is obtained through the flow of the introduced gas, the volume of the first space 201, the gas pressure in the first space 201, and the like, and reflects the air tightness of the first space 201.

[0224] Since the first detection result and the second detection result both meet the standards, if the third air tightness detection result does not meet the standard, it indicates that the sealing effect of the sealing structure 50 is not enough; if the third air tightness detection result meets the standard, it indicates that the sealing effect of the sealing structure 50 meets the standard, and at this time the sealing structure 50 realizes the mutual isolation of the first space 201 and the second space 60.

[0225] By adopting the above technical solution, the air tightness detection of the first space 201, the second space 60 and the sealing structure 50 is realized, and only one set of test tooling is required, so that the air tightness detection cost of the battery 100 can be reduced.

[0226] As one of the embodiments of the present application, as shown in FIGS. 3-5, the battery 100 includes a box body 20, a battery monomer 10, a protective plate 30, a thermal management component 40 and a sealing structure 50. The first space 201 is arranged in the box body 20, and the battery monomer 10 is arranged in the first space 201. The protective plate 30 is connected to the outside of the box body 20 to form the second space 60 with the first box wall 211 of the box body 20. The thermal management component 40 is arranged in the second space 60. The box body 20 is provided with the first box wall 211, and the first box wall 211 is provided with the through hole 202. The first space 201 can be communicated with the second space 60 through the through hole 202. The sealing structure 50 is sealed in the through hole 202 to isolate the first space 201 and the second space 60 from each other.

[0227] The above is only an optional embodiment of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A battery (100), wherein, The battery cell (10) comprises: a box (20) with a first space (201) containing the battery cell (10), a first box wall (211) of the box (20) being provided with a through hole (202); a protective plate (30) connected to the outside of the box (20) and surrounding the first box wall (211) to form a second space (60), the second space (60) being able to communicate with the first space (201) through the through hole (202); a sealing structure (50) sealed in the through hole (202) to isolate the first space (201) and the second space (60) from each other. The sealing structure (50) comprises:

2. The battery (100) according to claim 1, wherein a fixing member (51) penetrating the through hole (202) and fixed to the first box wall (211); a sealing member (52) arranged at the connection between the fixing member (51) and the first box wall (211). At least one of the sealing members (52) is a first sealing ring (52a) sleeved on the part of the fixing member (51) located in the through hole (202) and abutting between the outer peripheral wall of the fixing member (51) and the inner peripheral wall of the through hole (202).

3. The battery (100) according to claim 2, wherein The fixing member (51) comprises:

4. The battery (100) according to claim 2 or 3, wherein a fixing part (511) penetrating the through hole (202) and fixed to the first box wall (211); a limiting part (512) connected to the fixing part (511) along the penetrating direction of the through hole (202), the limiting part (512) being located on the side of the first box wall (211) away from the protective plate (30); wherein at least one of the sealing members (52) is arranged between the limiting part (512) and the first box wall (211); and / or at least one of the sealing members (52) is arranged between the fixing part (511) and the first box wall (211). At least one of the sealing members (52) is a second sealing ring (52b) sleeved on the outer periphery of the fixing part (511) and elastically abutting between the limiting part (512) and the first box wall (211) along the penetrating direction of the through hole (202).

5. The battery (100) according to claim 4, wherein The sealing structure (50) further comprises a gasket (53) sleeved on the outer periphery of the fixing part (511); along the penetrating direction of the through hole (202), the gasket (53) is arranged on the side of the limiting part (512) close to the first box wall (211), and the second sealing ring (52b) elastically abuts between the gasket (53) and the first box wall (211).

6. The battery (100) according to claim 5, wherein ​ 7. The battery (100) according to claim 5 or 6, wherein The first box wall (211) comprises a wall body (2111) and a boss (2112), the wall body (2111) is connected to the outer periphery of the boss (2112); the through hole (202) is arranged on the boss (2112); along the through direction of the through hole (202), the boss (2112) protrudes from the side of the wall body (2111) away from the protective plate (30), the limiting portion (512) is limited on the side of the boss (2112) away from the protective plate (30); and the second sealing ring (52b) is sleeved on the outer periphery of the boss (2112).

8. The battery (100) of claim 4, wherein, At least one of the sealing members (52) is a sealing adhesive layer (52c); along the through direction of the through hole (202), the sealing adhesive layer (52c) is connected to the side of the first box wall (211) away from the protective plate (30); and the sealing adhesive layer (52c) is also connected to the outer peripheral wall of the limiting portion (512).

9. The battery (100) according to any one of claims 2-8, wherein, The sealing structure (50) further comprises a fastener (54); along the through direction of the through hole (202), the fastener (54) is limited on the side of the first box wall (211) close to the protective plate (30); and the fixing member (51) is fixed to the fastener (54).

10. The battery (100) of claim 9, wherein, The fixing member (51) and the fastener (54) are threadedly connected.

11. The battery (100) according to claim 9 or 10, wherein The fastener (54) is fixed to the first box wall (211).

12. The battery (100) according to any one of claims 9-11, wherein, The fixing member (51) is detachably fixed to the first box wall (211).

13. The battery (100) according to any one of claims 4-8, wherein, The fixing portion (511) comprises a first fixing segment (5111) and a second fixing segment (5112); along the through direction of the through hole (202), the limiting portion (512), the first fixing segment (5111) and the second fixing segment (5112) are sequentially connected, the first fixing segment (5111) is located in the through hole (202); the outer diameter of the limiting portion (512) and the outer diameter of the second fixing segment (5112) are both greater than the hole diameter of the through hole (202), and the limiting portion (512) and the second fixing segment (5112) are respectively limited on the opposite sides of the first box wall (211).

14. The battery (100) according to any one of claims 1-13, wherein, The battery (100) further comprises a thermal management component (40), which is arranged in the second space (60) and is in thermal conductive connection with the battery monomer (10) to adjust the temperature of the battery monomer (10).

15. An electrical device, comprising: The battery (100) according to any one of claims 1-14 is used to provide electric energy.

16. A method of leak detection, wherein, The airtightness detection method is applied to the battery (100) according to any one of claims 1-14, and comprises: Introducing gas into the first space (201) of the box body (20) to detect the airtightness of the first space (201); Introducing gas into the first space (201) of the box body (20) to detect the airtightness of the first space (201); The protective plate (30) is connected to the outside of the box (20), so that the second space (60) formed by the protective plate (30) and the first box wall (211) of the box (20) is communicated with the first space (201) through the through hole (202) on the first box wall (211); Gas is introduced into the first space (201), and the air tightness of the first space (201) and the second space (60) is detected; The sealing structure (50) is sealed in the through hole (202), so that the first space (201) and the second space (60) are isolated from each other through the sealing structure (50).

17. The method of leak testing according to claim 16, wherein, After the gas is introduced into the first space (201) of the box (20), and the air tightness of the first space (201) is detected, before the protective plate (30) is connected to the outside of the box (20), so that the second space (60) formed by the protective plate (30) and the first box wall (211) of the box (20) is communicated with the first space (201) through the through hole (202) on the first box wall (211), comprising: The through hole (202) is formed on the first box wall (211).

18. The method of leak testing according to claim 16, wherein, Before the gas is introduced into the first space (201) of the box (20), and the air tightness of the first space (201) is detected, comprising: The through hole (202) is formed on the first box wall (211).

19. The method of leak testing according to any one of claims 16-18, wherein, The sealing structure (50) is sealed in the through hole (202), so that the first space (201) and the second space (60) are isolated from each other through the sealing structure (50), comprising: The sealing structure (50) is sealed in the through hole (202); Gas is introduced into the first space (201), and the air tightness of the first space (201) is detected.

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