Battery monomer, cover plate assembly, battery device and power utilization device

Abstract

The invention relates to a battery monomer, a cover plate assembly, a battery device and a power utilization device. The battery monomer comprises a shell body, an electrode assembly and the cover plate assembly, the shell body is provided with an accommodating cavity with an opening; the electrode assembly is accommodated in the accommodating cavity; the cover plate assembly covers the opening and comprises a cover plate body, a first electrode terminal, a movable plate and a connecting plate. The first electrode terminal comprises a first pole and a second pole; the movable plate can move close to or away from the cover plate body, and the first pole is mounted on the movable plate; the connecting plate is arranged on the side, away from the cover plate body, of the movable plate and connected with the cover plate body, the second pole is installed on the connecting plate, and the side, away from the movable plate, of the second pole is electrically connected with a tab of the electrode assembly; the movable plate has a first position and a second position relative to the cover plate body; at the first position, the first pole is propped against the second pole; and in the second position, the first pole is separated from the second pole. When the single battery is used, continuous over-charging can be blocked.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, cover plate assemblies, battery devices, and power-consuming devices. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery-powered vehicles, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools. When a battery is overcharged, the battery voltage rises rapidly as the polarization increases, which can cause irreversible changes in the structure of the positive electrode active material and the decomposition of the electrolyte, generating a large amount of gas and releasing a large amount of heat, causing the battery temperature and internal pressure to increase sharply, thereby affecting the service life and reliability of the battery. Summary of the Invention

[0003] In view of the above problems, this application provides a battery cell, a cover plate assembly, a battery device, and a power-consuming device, which can improve the service life and reliability of the battery.

[0004] In a first aspect, this application provides a battery cell, which includes a housing body, an electrode assembly, and a cover plate assembly. The housing body is configured with a receiving cavity having an opening; the electrode assembly is received in the receiving cavity; the cover plate assembly is disposed at the opening; the cover plate assembly includes a cover plate body, a first electrode terminal, a movable plate, and a connecting plate. The first electrode terminal includes a first pole column and a second pole column; the movable plate can move closer to or away from the cover plate body, and the first pole column is mounted on the movable plate; the connecting plate is disposed on a side of the movable plate facing away from the cover plate body and is connected to the cover plate body, and the second pole column is mounted on the connecting plate; a side of the second pole column away from the movable plate is electrically connected to the tab of the electrode assembly; the movable plate has a first position and a second position relative to the cover plate body; in the first position, the first pole column abuts against the second pole column; in the second position, the first pole column is separated from the second pole column.

[0005] For the battery cell provided in the embodiments of this application, since the movable plate of the cover plate assembly has a first position and a second position when moving closer to or away from the cover plate body, when the battery cell is being normally charged, the movable plate can move relative to the cover plate body to the first position, and the first pole column abuts against the second pole column, so that the external power supply can be electrically connected to the tab of the electrode assembly. When the battery cell experiences overcharging during the charging process, the movable plate can move relative to the cover plate body to the second position, so that the first pole column is separated from the second pole column, thereby disconnecting the connection between the first electrode terminal and the tab, and further disconnecting the circuit connected to the tab by the external power supply, blocking the continuous overcharging, and thus improving the service life and reliability of the battery.

[0006] In some of these embodiments, a guiding portion is constructed on one side of the cover plate body close to the movable plate, and the guiding portion penetrates through the movable plate; the cover plate assembly further includes an elastic member in a compressed state, the elastic member is sleeved on the guiding portion and abuts between the cover plate body and the movable plate; the elastic member can drive the movable plate to move closer to or away from the cover plate body, so that the movable plate switches between a first position and a second position.

[0007] By sleeving the elastic member on the guiding portion and abutting it between the cover plate body and the movable plate, when the battery cell is being normally charged, the elastic member can apply an elastic force to the movable plate, so that the movable plate is in the first position relative to the cover plate body, the first pole column abuts against the second pole column, and further realizes the abutment between the pole column and the tab of the electrode assembly, so that the external power supply is electrically connected to the tab and charges the electrode assembly. When the battery cell experiences overcharging and the internal pressure of the electrode assembly abnormally increases, when the air pressure generated inside the electrode assembly is greater than the elastic force applied by the elastic member to the movable plate, the movable plate will move towards the side close to the cover plate body, so that the movable plate moves to the second position relative to the cover plate body, so that the first pole column is separated from the second pole column, and further the circuit connected to the tab by the external power supply is disconnected, blocking the continuous progress of overcharging, and improving the service life and reliability of the battery.

[0008] In some of these embodiments, the elastic member applies a first elastic force to the movable plate, so that the movable plate moves away from and moves to the first position relative to the cover plate body.

[0009] Since the elastic member in the compressed state abuts between the cover plate body and the movable plate, the elastic member will apply a first elastic force to the movable plate, so that the movable plate has a tendency to move towards the side away from the cover plate body, and further the first pole column can abut against the second pole column, and the two are electrically connected.

[0010] In some of these embodiments, when the air pressure generated inside the electrode assembly is greater than the first elastic force, the movable plate can move closer to the cover plate body and move to the second position.

[0011] When the battery cell experiences overcharging, the electrolyte inside the electrode assembly may decompose to generate gas, thus causing a large air pressure inside the electrode assembly. When the air pressure generated inside the electrode assembly is greater than the first elastic force, the air pressure will drive the movable plate to move towards the cover plate body side to the second position, so that the first pole column is separated from the second pole column, and further the circuit connected to the tab by the external power supply is disconnected, blocking the further aggravation of overcharging.

[0012] In some of these embodiments, the cover plate body is configured with an installation cavity; the movable plate is at least partially received in the installation cavity and can move closer to or away from the bottom wall of the installation cavity so that the movable plate can switch between a first position and a second position.

[0013] By providing an installation cavity on the cover plate body and allowing the movable plate to be at least partially received in the installation cavity, the cavity wall of the installation cavity can protect the movable plate and at the same time form a moving space for the movable plate.

[0014] In some of these embodiments, the cover plate assembly further includes an elastic clamping portion; the elastic clamping portion is installed on the side cavity wall of the installation cavity and protrudes toward the inner side of the installation cavity; when the movable plate moves closer to the cover plate body to a preset position, the elastic clamping portion can deform so that the movable plate can cross the elastic clamping portion, and the elastic clamping portion supports the movable plate to the second position.

[0015] By installing the elastic clamping portion on the side cavity wall of the installation cavity and making the elastic clamping portion protrude toward the inner side of the installation cavity, when the movable plate moves closer to the cover plate body to a preset position, the elastic clamping portion can deform, so that the movable plate can cross the elastic clamping portion at the moment when the elastic clamping portion deforms, and finally the elastic clamping portion supports the movable plate to the second position, so as to avoid the situation that when the battery cell is overcharged, the air pressure generated by the electrode assembly is unstable and the air pressure changes, the first pole column and the second pole column will have multiple contacts and multiple separations. When the overcharge danger occurs for the first time, the battery cell can quickly cut off the electrical connection between the external power supply and the electrode assembly, so that the reliability during the use of the battery cell is higher.

[0016] In some of these embodiments, the elastic clamping portion and the side cavity wall of the installation cavity jointly enclose an elastic deformation space.

[0017] By jointly enclosing an elastic deformation space between the elastic clamping portion and the side cavity wall of the installation cavity, when the movable plate moves upward, the elastic clamping portion can deform at the elastic deformation space under the abutting force of the movable plate, that is to say, the elastic deformation space provides the space required for the elastic clamping portion to elastically deform when receiving the abutting force.

[0018] In some of these embodiments, the elastic clamping portion includes at least two clamping arms that are sequentially connected and arranged at an angle, and the maximum distance between at least one clamping arm and the side cavity wall of the installation cavity is greater than 0.

[0019] By setting the elastic clamping portion to include at least two clamping arms, and the maximum distance between at least one clamping arm and the side cavity wall of the installation cavity is greater than 0, the clamping arm can be elastically deformed and moved toward one side of the side cavity wall when subjected to the upward abutting force applied by the movable plate, so as to allow the movable plate to pass over the elastic clamping portion.

[0020] In some of the embodiments, a side blocking column protruding toward one side of the cavity is also constructed on the side cavity wall of the installation cavity; an avoidance hole recessed inward is also constructed on the outer wall of the movable plate; in a first position, the avoidance hole is arranged around the outer periphery of the side blocking column; in a second position, along a direction perpendicular to the movement of the movable plate, the avoidance hole and the side blocking column do not overlap.

[0021] When in the first position, the avoidance hole is arranged around the outer periphery of the side blocking column, so that the connection between the avoidance hole and the side blocking column is in an approximately sealed state, protecting the internal electrode assembly. When in the second position, along the moving direction perpendicular to the movable plate, the avoidance hole and the side blocking column do not overlap, so that when the battery cell is overcharged and the internal pressure of the electrode assembly increases abnormally and produces gas, the gas can flow and be discharged from the avoidance hole and the side blocking column, avoiding further expansion and damage to the shell.

[0022] In some of the embodiments, at the second position, along the moving direction of the movable plate, there is a distance between the surface of the side blocking column close to the bottom wall of the installation cavity and the movable plate.

[0023] Since there is a gap between the surface of the side blocking column close to the bottom wall of the installation cavity and the movable plate in the second position, there is a gap between the side blocking column and the avoidance hole. In this way, the gas generated during overcharging can be discharged from the gap between the side blocking column and the avoidance hole, thus preventing further expansion and damage to the shell.

[0024] In some of the embodiments, at the second position, the avoidance hole is connected to a side of the connecting plate facing away from the movable plate to form a first airflow channel.

[0025] The first airflow channel is formed by the distance between the avoidance hole and the side blocking column. The first airflow channel is formed by connecting the avoidance hole and the side of the connecting plate away from the movable plate, so that when the battery is overcharged and generates gas, an exhaust channel can be formed here to allow the gas to be discharged as soon as possible, thereby avoiding further damage to the battery.

[0026] In some of the embodiments, the cover plate assembly further includes a pressure relief valve; the pressure relief valve is mounted on the cover plate body.

[0027] By arranging a pressure relief valve on the cover plate body, the reliability of the battery cell during use is improved, and the risks of battery rupture and electrolyte leakage are reduced.

[0028] In some of these embodiments, at the second position, the pressure relief valve has a spacing from the side of the movable plate facing away from the connecting plate and forms a second air flow channel; the second air flow channel communicates with the first air flow channel.

[0029] By connecting the second air flow channel with the first air flow channel, when the battery is overcharged and generates gas, it is equivalent to adding more air flow conduction paths composed of the first air flow channel and the second air flow channel. As a result, compared with the traditional exhaust method, the gas has more paths and the exhaust is faster, so the reliability of the battery is higher.

[0030] In some of these embodiments, the number of guiding portions is at least one, and at least one guiding portion is configured with a diversion channel; a liquid injection port is configured on the cover body, and the liquid injection port communicates with the diversion channel; the connecting plate is also configured with a communication hole penetrating through its own thickness direction; the communication hole communicates with the side of the diversion channel facing away from the liquid injection port. By providing the liquid injection port, the diversion channel and the communication hole, after the battery cell is assembled, the electrolyte can be injected through the liquid injection port, which is more convenient.

[0031] In some of these embodiments, the cover assembly further includes a sealing plug; the sealing plug is detachably connected to the liquid injection port. By detachably connecting the sealing plug to the liquid injection port, it is more convenient for injecting and replenishing the electrolyte.

[0032] In some of these embodiments, the cover assembly further includes a connecting member; the connecting member passes through the connecting plate and is fixedly connected to the cover body.

[0033] In this application, the connecting plate and the cover body are fixedly connected through the connecting member, so that the connection between the connecting plate and the cover body is relatively stable, and the position of the second pole column is not prone to relative shaking, so that the connection between the first pole column and the pole ear is relatively stable.

[0034] In some of these embodiments, an installation through hole is further configured on the cover body; at least a part of the first pole column is received in the installation through hole; when the movable plate switches between the first position and the second position relative to the cover body, the first pole column can slide in the installation through hole.

[0035] By providing the installation through hole on the cover body and allowing at least a part of the first pole column to be received in the installation through hole, when the movable plate switches between the first position and the second position relative to the cover body, the first pole column can slide in the installation through hole. Furthermore, the sliding of the first pole column is guided by the installation through hole, and the outer periphery of the first pole column can also be protected, so that the first pole column is relatively stable when switching from the first position to the second position.

[0036] In some of these embodiments, the cover plate assembly further includes an insulating member disposed on a side of the cover plate body facing away from the movable plate, and the insulating member surrounds the outer periphery of the mounting through-hole. The outer periphery of the first pole column can be insulated through the insulating member, thereby making the battery more reliable during charging and use.

[0037] In some of these embodiments, an exhaust hole penetrating in the thickness direction is further formed in the connecting plate. By forming the exhaust hole in the connecting plate, when the battery is overcharged and generates gas, the gas can be quickly exhausted through the exhaust hole, thereby reducing the possibility of further expansion and damage of the housing body.

[0038] In some of these embodiments, the cover plate assembly further includes a sealing member; the sealing member is sleeved on the outer periphery of the second pole column. By providing the sealing member on the outer periphery of the second pole column, the connection part at the second pole column isolates the electrode assembly, reducing the possibility of leakage of the electrolyte in the electrode assembly.

[0039] In some of these embodiments, the cover plate assembly further includes a second electrode terminal, and the second electrode terminal is spaced apart from the first electrode terminal and has a different polarity. Through the cooperation of the second electrode terminal and the first electrode terminal, the conduction of the positive and negative electrodes of the battery cell and the external power supply is realized.

[0040] In some of these embodiments, the number of the first electrode terminals is two, and the two first electrode terminals are spaced apart and have different polarities. By providing two first electrode terminals with different polarities, they are connected to the two pole ears of the electrode assembly with different polarities, thereby realizing the conduction of the positive and negative electrodes of the battery cell and the external power supply.

[0041] In a second aspect, the present application provides a cover plate assembly, which includes a cover plate body, a first electrode terminal, a movable plate, and a connecting plate. The first electrode terminal includes a first pole column and a second pole column; the movable plate can move closer to or away from the cover plate body, and the first pole column is installed on the movable plate; the connecting plate is disposed on a side of the movable plate facing away from the cover plate body and is connected to the cover plate body, the second pole column is installed on the connecting plate, and the side of the second pole column away from the movable plate is used for electrically connecting to the pole ear of the electrode assembly; the movable plate has a first position and a second position relative to the cover plate body; in the first position, the first pole column abuts against the second pole column; in the second position, the first pole column is separated from the second pole column.

[0042] The cover plate assembly provided in the embodiments of the present application is assembled with the electrode assembly and the housing body of the battery cell to form a battery cell. Since the movable plate of the cover plate assembly has a first position and a second position when moving closer to or away from the cover plate body, when the battery cell is being normally charged, the movable plate can move relative to the cover plate body to the first position, and the first pole column abuts against the second pole column, so that an external power supply can be electrically connected to the tab of the electrode assembly. When overcharging occurs during the charging process of the battery cell, the movable plate can move relative to the cover plate body to the second position, so that the first pole column is separated from the second pole column, so that the connection between the first electrode terminal and the tab is disconnected, and further the circuit connected to the tab by the external power supply is disconnected, blocking the continuous progress of overcharging, thus improving the service life and reliability of the battery.

[0043] In a third aspect, the present application provides a battery device, which includes a box body and the battery cell described in any one of the above embodiments. The box body is configured with a receiving space; the battery cell is accommodated in the receiving space.

[0044] When the battery device is in use, since the pole column of each battery cell includes a first pole column and a second pole column, the external power supply can be connected or disconnected from the battery device by moving the movable plate of the cover plate assembly relative to the cover plate body to the first position or the second position, thereby blocking the continuous progress of overcharging and improving the service life and reliability of the battery device.

[0045] In a fourth aspect, the present application provides an electrical device, which includes the battery device described in any one of the above embodiments, and the battery device is used to provide electrical energy for the electrical device. When the electrical device provided in the embodiments of the present application is in use, since the movable plate of the cover plate assembly of the battery cell has a first position and a second position when moving closer to or away from the cover plate body, when the battery cell is being normally charged, the movable plate can move relative to the cover plate body to the first position, and the first pole column abuts against the second pole column, so that an external power supply can be electrically connected to the tab of the electrode assembly. When overcharging occurs during the charging process of the battery cell, the movable plate can move relative to the cover plate body to the second position, so that the first pole column is separated from the second pole column, so that the connection between the first electrode terminal and the tab is disconnected, and further the circuit connected to the tab by the external power supply is disconnected, blocking the continuous progress of overcharging, and finally improving the service life and reliability of the electrical device.

[0046] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0047] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0048] Figure 1 Schematic structural diagram of an electrical device provided for some embodiments of the present application, where the electrical device is a vehicle.

[0049] Figure 2 is Figure 1 Exploded structural diagram of the battery device shown.

[0050] Figure 3 Exploded structural diagram of a battery cell provided for some embodiments of the present application.

[0051] Figure 4 Schematic diagram of a cover plate assembly of a battery cell provided for some embodiments of the present application.

[0052] Figure 5 is Figure 4 The first schematic diagram of the exploded structure of the cover plate assembly shown.

[0053] Figure 6 is Figure 4 The second schematic diagram of the exploded structure of the cover plate assembly shown.

[0054] Figure 7 is Figure 5 Connection schematic diagram of a cover plate body and an elastic member in the cover plate assembly shown.

[0055] Figure 8 is Figure 7 Partial enlarged view at C shown.

[0056] Figure 9 is Figure 5 Schematic diagram of a movable plate in the cover plate assembly shown.

[0057] Figure 10 is Figure 5 Schematic diagram of a connecting plate in the cover plate assembly shown.

[0058] Figure 11 is Figure 4 Cross-sectional view taken along line A-A shown.

[0059] Figure 12 is a cross-sectional view taken along line B-B of the movable plate relative to the cover plate body at the first position Figure 4 shown.

[0060] Figure 13 The cross-sectional view taken along line B-B shown in Figure 4 Figure 2 when the movable plate is at the second position relative to the cover plate body.

[0061] The reference numerals in the specific embodiments are as follows:

[0062] 10000 - Vehicle;

[0063] 1000 - Battery device;

[0064] 1100 - Battery cell;

[0065] 100 - Housing body; 100a - Opening; 110 - Accommodating cavity; 200 - Electrode assembly; 210 - Tab;

[0066] 300 - Cover plate assembly;

[0067] 310 - Cover plate body; 311 - Installation cavity; 3111 - Side cavity wall; 3112 - Bottom wall; 3113 - Side plug post; 312 - Guide part; 3121 - Flow guiding channel; 313 - Liquid injection port; 314 - Installation through hole;

[0068] 320 - Movable plate; 321 - First pole; 322 - Avoidance hole; 323 - Through hole;

[0069] 330 - Connecting plate; 331 - Second pole; 332 - Communication hole; 333 - Exhaust hole; 334 - Sealing member;

[0070] 340 - Elastic member;

[0071] 350 - Elastic clamping part; 350a - Elastic deformation space; 351 - Clamping arm;

[0072] 360 - Pressure relief valve;

[0073] 370 - Plug;

[0074] 380 - Connecting part;

[0075] 390 - Insulating part;

[0076] 1200 - Box body; 1210 - First part; 1220 - Second part; 2000 - Controller; 3000 - Motor. Specific embodiments

[0077] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0079] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0080] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0081] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0082] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0083] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0084] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0085] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0086] When the battery is overcharged, the battery voltage rises rapidly with the increase of polarization, which will cause irreversible changes in the structure of the positive active material and the decomposition of the electrolyte, generating a large amount of gas and releasing a large amount of heat, resulting in a sharp increase in the battery temperature and internal pressure, thus affecting the service life and reliability of the battery.

[0087] Based on the above considerations, in order to solve the problem that the service life and reliability of the battery will be affected when the battery is overcharged, the present application provides a battery cell, which can timely block the electrical connection between the terminal post and the tab under overcharge conditions, so that the external power supply is disconnected from the circuit connected to the tab, thereby blocking the continuous progress of overcharging, and finally improving the service life and reliability of the battery.

[0088] The power battery formed by the battery cell disclosed in the embodiments of the present application can be but is not limited to being used in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0089] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0090] Please refer to Figure 1 , Figure 1The structural schematic diagram of a vehicle 10000 provided by some embodiments of the present application is shown. The vehicle 10000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle 10000, and the battery can be arranged at the bottom, the head or the tail of the vehicle 10000. The battery can be used for power supply of the vehicle 10000. For example, the battery can be used as the operating power source of the vehicle 10000. The vehicle 10000 may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery to supply power to the motor 3000. For example, it is used for the working power requirements during the start-up, navigation and driving of the vehicle 10000.

[0091] In some embodiments of the present application, the battery can not only be used as the operating power source of the vehicle 10000, but also be used as the driving power source of the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0092] Please refer to Figure 2 , Figure 2 which shows Figure 1 the explosion diagram of the battery shown. The battery includes a box body 1200 and battery cells 1100. The battery cells 1100 are accommodated in the box body 1200. Among them, the box body 1200 is used to provide an accommodation space for the battery cells 1100, and the box body 1200 can adopt various structures. In some embodiments, the box body 1200 may include a first part 1210 and a second part 1220. The first part 1210 and the second part 1220 cover each other, and the first part 1210 and the second part 1220 jointly define an accommodation space for accommodating the battery cells 1100. The second part 1220 can be a hollow structure with an opening 100a at one end, and the first part 1210 can be a plate-like structure. The first part 1210 covers the opening 100a side of the second part 1220 so that the first part 1210 and the second part 1220 jointly define an accommodation space; the first part 1210 and the second part 1220 can also both be hollow structures with an opening 100a on one side, and the opening 100a side of the first part 1210 covers the opening 100a side of the second part 1220. Of course, the box body 1200 formed by the first part 1210 and the second part 1220 can be of various shapes, such as a cylinder, a cuboid, etc.

[0093] In a battery, there may be multiple battery cells 1100. The multiple battery cells 1100 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 1100. The multiple battery cells 1100 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 1100 is accommodated in the box 1200. Of course, the battery can also be that multiple battery cells 1100 are first connected in series, in parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 1200. The battery can also include other structures. For example, the battery can also include a busbar component for realizing the electrical connection among the multiple battery cells 1100.

[0094] Please refer to Figure 3 and in combination with Figures 4 - 6 and Figures 11 - 13 , Figure 3 which shows Figure 2 an exploded view of the battery cell 1100 shown. The battery cell 1100 is the smallest unit that makes up the battery device 1000. Figure 4 which shows a schematic diagram of the cover assembly 300 of the battery cell 1100 provided in some embodiments of the present application. Figure 5 which shows Figure 4 a first schematic diagram of the exploded structure of the cover assembly 300 shown. Figure 6 which shows Figure 4 a second schematic diagram of the exploded structure of the cover assembly 300 shown. Figure 11 which shows Figure 4 a cross-sectional view taken along A-A shown. Figure 12 which shows Figure 4 a cross-sectional view taken along B-B shown of the movable plate 320 relative to the cover body 310 at the first position. Figure 13 which shows Figure 4 a cross-sectional view taken along B-B shown of the movable plate 320 relative to the cover body 310 at the second position.

[0095] The battery cell 1100 provided by some embodiments of the present application includes a housing body 100, an electrode assembly 200, and a cover plate assembly 300. The housing body 100 is configured with a receiving cavity 110 having an opening 100a; the electrode assembly 200 is received in the receiving cavity 110; the cover plate assembly 300 is covered at the opening 100a; the cover plate assembly 300 includes a cover plate body 310, a first electrode terminal, a movable plate 320, and a connecting plate 330. The first electrode terminal includes a first pole column 321 and a second pole column 331; the movable plate 320 can move closer to or away from the cover plate body 310, and the first pole column 321 is installed on the movable plate 320; the connecting plate 330 is disposed on a side of the movable plate 320 facing away from the cover plate body 310 and is connected to the cover plate body 310, the second pole column 331 is installed on the connecting plate 330, and a side of the second pole column 331 away from the movable plate 320 is electrically connected to the tab 210 of the electrode assembly 200; the movable plate 320 has a first position and a second position relative to the cover plate body 310; in the first position, the first pole column 321 abuts against the second pole column 331; in the second position, the first pole column 321 is separated from the second pole column 331.

[0096] As Figure 3 , the battery cell 1100 includes a cover plate assembly 300, a housing, an electrode assembly 200, and other functional components. The housing is a component for cooperating with the cover plate assembly 300 to form the internal environment of the battery cell 1100, wherein the formed internal environment can be used to accommodate the electrode assembly 200, the electrolyte, and other components. The housing and the cover plate assembly 300 can be independent components. An opening 100a can be provided on the housing, and the cover plate assembly 300 is covered at the opening 100a to form the internal environment of the battery cell 1100. Without limitation, the cover plate assembly 300 and the housing can also be integrated. Specifically, the cover plate assembly 300 and the housing can form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the interior of the housing, the cover plate assembly 300 is then covered on the housing. The housing can be of various shapes and sizes, such as rectangular parallelepiped shape, cylindrical shape, hexagonal prism shape, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly 200. The material of the housing can be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0097] The electrode assembly 200 is a component in the battery cell 1100 where an electrochemical reaction occurs. One or more electrode assemblies 200 can be contained within the housing. The electrode assembly 200 is mainly formed by thermally compounding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet to form a composite tape, and then laminating the composite tape. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 200, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs 210. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs 210 are connected to the electrode terminals to form a current loop.

[0098] The cover plate assembly 300 refers to a component that covers the opening 100a of the housing to isolate the internal environment of the battery cell 1100 from the external environment. Without limitation, the shape of the cover plate assembly 300 can be adapted to the shape of the housing to cooperate with the housing. Optionally, the cover plate assembly 300 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover plate assembly 300 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 1100 to have higher structural strength and improved safety performance. Functional components such as electrode posts can be provided on the cover plate assembly 300. The electrode post can be used for electrical connection with the electrode assembly 200 to output or input the electrical energy of the battery cell 1100. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1100 reaches a threshold can also be provided on the cover plate assembly 300. The material of the cover plate assembly 300 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the cover plate assembly 300, and the insulating structure can be used to isolate the electrical connection components in the housing from the cover plate assembly 300 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0099] In the battery cell 1100 provided by the embodiments of the present application, since the movable plate 320 of the cover plate assembly 300 has a first position and a second position when moving closer to or farther from the cover plate body 310, when the battery cell 1100 is being normally charged, the movable plate 320 can move relative to the cover plate body 310 to the first position, and the first electrode post 321 abuts against the second electrode post 331 (as Figure 12 shown), so that the external power supply can be electrically connected to the electrode tab 210 of the electrode assembly 200. When the battery cell 1100 experiences overcharging during the charging process, the movable plate 320 can move relative to the cover plate body 310 to the second position, so that the first electrode post 321 is separated from the second electrode post 331 (as Figure 13As shown in the figure, the connection between the first electrode terminal and the tab 210 is disconnected, so that the external power supply is disconnected from the circuit connected to the tab 210, blocking the continuous overcharging, thus improving the service life and reliability of the battery.

[0100] The battery cell 1100 provided by the embodiment of the present application can realize the on-off of the charging circuit through a physical structure. Different from the overcharge protection method that relies on a complex electronic control system, a simple and reliable mechanical structure is adopted to achieve overcharge protection. Compared with electronic components, the cover plate assembly 300 will not cause the overcharge protection function to fail due to faults, electromagnetic interference or software algorithm errors. The reliability of overcharge protection is greatly improved, making the battery cell 1100 more reliable.

[0101] It should be noted that the first electrode terminal can be a positive terminal or a negative terminal, and no special limitation is made in this regard.

[0102] The structure of the battery cell 1100 will be specifically described below. Please refer to Figures 7 - 10 , Figure 7 shows Figure 5 a schematic connection diagram of the cover plate body 310 and the elastic member 340 in the cover plate assembly 300 shown in the figure. Figure 8 shows Figure 7 a partial enlarged view of the C position shown in the figure. Figure 9 shows Figure 5 a schematic diagram of the movable plate 320 in the cover plate assembly 300 shown in the figure. Figure 10 shows Figure 5 a schematic diagram of the connecting plate 330 in the cover plate assembly 300 shown in the figure.

[0103] Please refer to Figure 6 , Figure 7 and Figures 11 - 13 In some embodiments, a guiding portion 312 is formed on one side of the cover plate body 310 close to the movable plate 320, and the guiding portion 312 penetrates through the movable plate 320; the cover plate assembly 300 further includes an elastic member 340 in a compressed state, and the elastic member 340 is sleeved on the guiding portion 312 and abuts between the cover plate body 310 and the movable plate 320; the elastic member 340 can drive the movable plate 320 to move closer to or away from the cover plate body 310, so that the movable plate 320 can be switched between a first position and a second position.

[0104] The guiding portion 312 can be in a columnar structure or a prismatic structure. The guiding portion 312 can be integrally processed with the cover plate body 310, or after the two are processed separately, the guiding portion 312 can be welded or adhered to the cover plate body 310. The elastic member 340 can be a spring or an elastic gasket structure that can be compressed and deformed to generate elastic force. A through hole 323 adapted to the guiding portion 312 is formed on the movable plate 320, so that the guiding portion 312 can pass through the movable plate 320.

[0105] By sleeving the elastic member 340 on the guiding portion 312 and abutting it between the cover plate body 310 and the movable plate 320, when the battery cell 1100 is being normally charged, the elastic member 340 can apply an elastic force to the movable plate 320, so that the movable plate 320 is in a first position relative to the cover plate body 310, and the first pole column 321 abuts against the second pole column 331, thereby realizing the abutment of the pole column and the tab 210 of the electrode assembly 200, so that the external power supply is electrically connected to the tab 210 and the electrode assembly 200 is charged. When the battery cell 1100 experiences overcharging and the internal pressure of the electrode assembly 200 rises abnormally, when the air pressure generated inside the electrode assembly 200 is greater than the elastic force applied by the elastic member 340 to the movable plate 320, the movable plate 320 will move towards the side close to the cover plate body 310, so that the movable plate 320 moves relative to the cover plate body 310 to a second position, so that the first pole column 321 is separated from the second pole column 331, thereby disconnecting the circuit connected to the tab 210 by the external power supply and blocking the continuous progress of overcharging, improving the service life and reliability of the battery.

[0106] Please refer to Figure 12 , in some embodiments, the elastic member 340 applies a first elastic force to the movable plate 320 to move the movable plate 320 away from and to a first position relative to the cover plate body 310.

[0107] The magnitude of the first elastic force can be adaptively adjusted according to the magnitude of the air pressure generated by overcharging of the battery cell 1100. The magnitude of the first elastic force can be adjusted by adjusting the stiffness and compression amount of the elastic member 340.

[0108] Since the elastic member 340 in the compressed state abuts between the cover plate body 310 and the movable plate 320, the elastic member 340 will apply a first elastic force to the movable plate 320, so that the movable plate 320 has a tendency to move towards the side away from the cover plate body 310, and further the first pole column 321 can abut against the second pole column 331, and the two are electrically connected.

[0109] Please refer to Figure 13, in some embodiments, when the air pressure generated inside the electrode assembly 200 is greater than the first elastic force, the movable plate 320 can move closer to the cover body 310 and move to the second position.

[0110] When the battery cell 1100 experiences overcharging, it may cause overheating, expansion, and leakage inside the electrode assembly 200. The electrolyte inside the electrode assembly 200 may decompose to generate gas, thereby generating a relatively large air pressure inside the electrode assembly 200.

[0111] When the air pressure generated inside the electrode assembly 200 due to overcharging is greater than the first elastic force, the air pressure will drive the movable plate 320 to move toward the cover body 310 to the second position, so that the first pole column 321 is separated from the second pole column 331, and then the external power supply is disconnected from the circuit connected to the tab 210, blocking the further aggravation of overcharging.

[0112] Please refer to Figure 6 , Figure 7 and Figures 11 - 13 , in some embodiments, the cover body 310 is configured with an installation cavity 311; the movable plate 320 is at least partially received in the installation cavity 311 and can move closer to or away from the bottom wall 3112 of the installation cavity 311, so that the movable plate 320 can switch between the first position and the second position.

[0113] The shape of the installation cavity 311 is adapted to the shape of the movable plate 320, so that the movable plate 320 can move conveniently in the installation cavity 311.

[0114] By providing the installation cavity 311 on the cover body 310 and making the movable plate 320 at least partially received in the installation cavity 311, the cavity wall of the installation cavity 311 can protect the movable plate 320 and at the same time form a moving space for the movable plate 320.

[0115] Please refer to Figure 7 and combine with Figure 8 and Figure 12 with Figure 13 , in some embodiments, the cover assembly 300 further includes an elastic clamping portion 350; the elastic clamping portion 350 is installed on the side cavity wall 3111 of the installation cavity 311 and protrudes toward the inside of the installation cavity 311; when the movable plate 320 moves closer to the cover body 310 to a preset position, the elastic clamping portion 350 can be deformed so that the movable plate 320 can cross the elastic clamping portion 350, and the elastic clamping portion 350 supports the movable plate 320 to the second position.

[0116] The elastic clamping portion 350 can be composed of multiple elastic arms that can deform. When the battery is in normal use and charging, the elastic clamping portion 350 is located between the movable plate 320 and the cover body 310. When the battery is overcharged and internal air pressure is generated, the air pressure will push the movable plate 320 to move towards the side close to the cover body 310, so that the elastic arms can deform under the abutting force of the movable plate 320, and then the movable plate 320 can cross over the elastic clamping portion 350, and the elastic clamping portion 350 supports the movable plate 320 to the second position, so that the movable plate 320 will not fall back to the first position again, reducing the possibility of the first pole 321 and the second pole 331 abutting and connecting again.

[0117] In this application, the elastic clamping portion 350 is installed on the cavity side wall of the installation cavity 311, and the elastic clamping portion 350 protrudes towards the inner side of the installation cavity 311, so that when the movable plate 320 moves closer to the cover body 310 to a preset position, the elastic clamping portion 350 can deform, so that the movable plate 320 can cross over the elastic clamping portion 350 at the moment when the elastic clamping portion 350 deforms, and finally the elastic clamping portion 350 supports the movable plate 320 to the second position, so as to avoid that when the battery cell 1100 is overcharged, the air pressure generated by the electrode assembly 200 is unstable and the air pressure changes in magnitude, there will be multiple abutting and multiple separating conditions between the first pole 321 and the second pole 331. When the overcharge danger occurs for the first time, the battery cell 1100 can quickly cut off the electrical connection between the external power supply and the electrode assembly 200, so that the reliability of the battery cell 1100 during use is higher.

[0118] It should be noted that when the battery is overcharged, the internal air pressure does not rise continuously and stably, and there may be short-term fluctuations. When the internal pressure of the battery cell 1100 provided in this application abnormally increases due to overcharging, the movable plate 320 quickly moves upward under the action of the air pressure, overcoming the elastic force of the elastic member 340. When the movable plate 320 moves upward to the preset position, the elastic clamping portion 350 can accurately block the upward-moving movable plate 320. Thereby, when the air pressure drops briefly, the movable plate 320 may move downward under the action of the first elastic force, resulting in the first pole 321 and the second pole 331 coming into contact again, and the possibility of the overcharge current flowing again can be reduced. With the existence of the elastic clamping portion 350 in this application, it is ensured that the movable plate 320 will not accidentally move downward during short-term fluctuations of the air pressure, and the disconnection state between the first pole 321 and the second pole 331 is stably maintained.

[0119] Please refer to Figure 8 , in some of the embodiments, the elastic clamping portion 350 and the side cavity wall 3111 of the installation cavity 311 jointly enclose an elastic deformation space 350a.

[0120] The elastic deformation space 350a can be a triangular prism structure with a triangular cross-section or a pentagonal prism structure with a trapezoidal cross-section, and no special limitation is made thereto.

[0121] By jointly enclosing an elastic deformation space 350a between the elastic clamping portion 350 and the side cavity wall 3111 of the installation cavity 311, when the movable plate 320 moves upward, the elastic clamping portion 350 can be elastically deformed at the elastic deformation space 350a under the abutting force of the movable plate 320. That is to say, the elastic deformation space 350a provides a space for the elastic clamping portion 350 to elastically deform when receiving the abutting force.

[0122] Please refer to Figure 8 , in some embodiments, the elastic clamping portion 350 includes at least two clamping arms 351 that are sequentially connected and arranged at an angle, and the maximum distance between at least one clamping arm 351 and the side cavity wall 3111 of the installation cavity 311 is greater than 0.

[0123] The elastic clamping portion 350 can include two clamping arms 351 arranged at an angle, and the two clamping arms 351 and the side cavity wall 3111 of the installation cavity 311 jointly form an elastic deformation space 350a with a triangular prism structure. Of course, the elastic clamping portion 350 can also include three or four clamping arms 351 that are sequentially connected and arranged at an angle, so as to form an elastic deformation space 350a with a quadrangular prism or pentagonal prism structure.

[0124] By setting the elastic clamping portion 350 to include at least two clamping arms 351, and the maximum distance between at least one clamping arm 351 and the side cavity wall 3111 of the installation cavity 311 is greater than 0, when the clamping arm 351 receives an upward abutting force applied by the movable plate 320, it can elastically deform and move toward the side cavity wall 3111, so that the movable plate 320 can pass over the elastic clamping portion 350.

[0125] Please refer to Figure 6 , Figure 7 and Figure 11 , in some embodiments, a side blocking post 3113 protruding toward the inside of the cavity is further constructed on the side cavity wall 3111 of the installation cavity 311; an avoidance hole 322 is further constructed on the outer side wall of the movable plate 320 by being recessed inward; in the first position, the avoidance hole 322 surrounds the outer periphery of the side blocking post 3113; in the second position, along the direction perpendicular to the movement direction of the movable plate 320, the avoidance hole 322 and the side blocking post 3113 do not coincide.

[0126] The side plug post 3113 can be a partial cylindrical structure, such as a semi-cylindrical shape. The avoidance hole 322 is adapted to the outer wall morphology of the side plug post 3113.

[0127] When in the first position, the avoidance hole 322 surrounds the outer periphery of the side plug post 3113, so that the connection between the avoidance hole 322 and the side plug post 3113 is in an approximately sealed state to protect the internal electrode assembly 200. When in the second position, along the direction perpendicular to the moving direction of the movable plate 320, that is, parallel to Figure 6 with Figure 7 the plane of xx'yy' in, the avoidance hole 322 does not coincide with the side plug post 3113. Thus, when the battery cell 1100 experiences overcharging and causes the internal pressure of the electrode assembly 200 to rise abnormally and generate gas, the gas can flow and discharge from the position between the avoidance hole 322 and the side plug post 3113, avoiding further expansion and damage of the housing.

[0128] In some embodiments, in the second position, along the moving direction of the movable plate 320, there is a spacing between the surface of the side plug post 3113 close to the bottom wall 3112 of the installation cavity 311 and the movable plate 320; specifically, the moving direction of the movable plate 320 is Figures 11 - 13 the zz' direction in.

[0129] By setting the minimum spacing between the side plug post 3113 and the bottom wall 3112 of the installation cavity 311 to be greater than the maximum thickness of the connecting plate 330 and by defining the installation position of the elastic clamping portion 350, when the movable plate 320 is supported on the elastic clamping portion 350, there is a spacing between the surface of the side plug post 3113 close to the bottom wall 3112 of the installation cavity 311 and the movable plate 320.

[0130] Since in the second position, there is a spacing between the surface of the side plug post 3113 close to the bottom wall 3112 of the installation cavity 311 and the movable plate 320, there is a spacing between the side plug post 3113 and the avoidance hole 322. In this way, the gas generated during overcharging can be discharged from the spacing between the side plug post 3113 and the avoidance hole 322, avoiding further expansion and damage of the housing.

[0131] In some embodiments, in the second position, the avoidance hole 322 and the side of the connecting plate 330 facing away from the movable plate 320 communicate to form a first air flow channel.

[0132] The first air flow channel is the air flow channel formed by the distance between the avoidance hole 322 and the side plug column 3113. By forming the first air flow channel through the avoidance hole 322 and the side of the connecting plate 330 facing away from the movable plate 320, when the battery is overcharged and generates gas, an exhaust channel can be formed here, so that the gas can be discharged as soon as possible, thus avoiding further damage to the battery.

[0133] Please refer to Figure 5 , Figure 6 and Figures 11 - 13 , in some embodiments, the cover plate assembly 300 further includes a pressure relief valve 360; the pressure relief valve 360 is installed on the cover plate body 310.

[0134] The pressure relief valve 360 can release the gas when the electrolyte of the battery decomposes to generate gas, thus avoiding the risk of high-pressure expansion damage to the shell body 100 of the battery.

[0135] By providing the pressure relief valve 360 on the cover plate body 310, the reliability during the use of the battery cell 1100 is higher, and the risk of the battery bursting and the electrolyte leaking is reduced.

[0136] In some embodiments, at the second position, the pressure relief valve 360 has a distance from the side of the movable plate 320 facing away from the connecting plate 330 and forms a second air flow channel; the second air flow channel is connected to the first air flow channel.

[0137] By defining that the thickness of the movable plate 320 itself is less than the distance of the pressure relief valve 360 relative to the clamping position of the elastic clamping portion 350, at the second position, the pressure relief valve 360 can have a distance from the side of the movable plate 320 facing away from the connecting plate 330 and form a second air flow channel.

[0138] In this application, by connecting the second air flow channel to the first air flow channel, when the battery is overcharged and generates gas, it is equivalent to adding more air flow conduction paths composed of the first air flow channel and the second air flow channel. Therefore, compared with the traditional exhaust method, the gas has more paths and is exhausted more quickly, so the reliability of the battery is also higher.

[0139] Please refer to Figure 6 , Figure 7 and Figure 11 , in some embodiments, the number of the guiding portions 312 is at least one, and at least one guiding portion 312 is configured with a diversion channel 3121; a liquid injection port 313 is configured on the cover plate body 310, and the liquid injection port 313 is connected to the diversion channel 3121; the connecting plate 330 is further configured with a communication hole 332 penetrating along its own thickness direction; the communication hole 332 is connected to the side of the diversion channel 3121 facing away from the liquid injection port 313.

[0140] The liquid injection port 313 can coincide with the central axis of the diversion channel 3121, facilitating processing and enabling smoother liquid flow inside. The communication hole 332 can also coincide with the central axis of the diversion channel 3121, making the alignment processing of the liquid injection port 313, the diversion channel 3121, and the communication hole 332 more convenient.

[0141] By providing the liquid injection port 313, the diversion channel 3121, and the communication hole 332 in this application, after the battery cell 1100 is assembled, it is convenient to inject the electrolyte through the liquid injection port 313.

[0142] Please refer to Figure 5 and Figure 11 , in some embodiments, the cover plate assembly 300 further includes a plug 370; the plug 370 is detachably connected to the liquid injection port 313.

[0143] The plug 370 can be in interference fit with the liquid injection port 313, enabling the plug 370 to better block the liquid injection port 313.

[0144] By detachably connecting the plug 370 to the liquid injection port 313 in this application, it is convenient to inject and supplement the electrolyte.

[0145] Please refer to Figure 5 and Figure 6 , in some embodiments, the cover plate assembly 300 further includes a connecting member 380; the connecting member 380 passes through the connecting plate 330 and is fixedly connected to the cover plate body 310.

[0146] The cover plate body 310 is configured with a convex portion, and a connecting hole is provided on the convex portion. The connecting member 380 passes through the connecting plate 330 and is fixedly connected to the connecting hole on the convex portion, thereby realizing the fixed connection between the connecting plate 330 and the cover plate body 310.

[0147] By fixedly connecting the connecting plate 330 and the cover plate body 310 through the connecting member 380 in this application, the connection between the connecting plate 330 and the cover plate body 310 is more stable, and the position of the second pole column 331 is not prone to relative shaking, making the connection between the first pole column 321 and the ear 210 more stable.

[0148] Please refer to Figures 5 - 7 , in some embodiments, the cover plate body 310 is further configured with a mounting through hole 314; at least a part of the first pole column 321 is received in the mounting through hole 314; when the movable plate 320 switches between the first position and the second position relative to the cover plate body 310, the first pole column 321 can slide in the mounting through hole 314.

[0149] The mounting through hole 314 is spaced apart from the pressure relief valve 360. The aperture of the mounting through hole 314 can be slightly larger than the outer diameter of the first pole 321, so as to facilitate the sliding of the first pole 321 within the mounting through hole 314.

[0150] In this application, by providing the mounting through hole 314 on the cover body 310 and enabling at least a part of the first pole 321 to be received within the mounting through hole 314, when the movable plate 320 switches between the first position and the second position relative to the cover body 310, the first pole 321 can slide within the mounting through hole 314. Furthermore, the sliding of the first pole 321 is guided by the mounting through hole 314, and the outer periphery of the first pole 321 can also be protected, making the first pole 321 more stable when switching from the first position to the second position.

[0151] Please refer to Figure 5 and Figures 11 - 13 , in some embodiments, the cover assembly 300 further includes an insulating member 390. The insulating member 390 is disposed on the side of the cover body 310 facing away from the movable plate 320, and the insulating member 390 surrounds the outer periphery of the mounting through hole 314.

[0152] The insulating member 390 can be made of a non-conductive material such as plastic or rubber. Thus, the outer periphery of the first pole 321 can be insulated through the insulating member 390, and further, the reliability of the battery during charging and use is higher.

[0153] Please refer to Figure 5 , Figure 6 and Figure 10 , in some embodiments, an exhaust hole 333 penetrating along the thickness direction of the connecting plate 330 is further formed on the connecting plate 330; specifically, the thickness direction of the connecting plate 330 is the zz' direction in Figure 5 , Figure 6 and Figure 10 . The exhaust hole 333 can be disposed below the pressure relief valve 360, and support ribs connected to the hole wall can also be provided within the exhaust hole 333, so as to prevent foreign objects from falling into the lower electrode assembly 200 through the exhaust hole 333.

[0154] By forming the exhaust hole 333 on the connecting plate 330, when the battery is overcharged and generates gas, the gas can be quickly exhausted through the exhaust hole 333, thereby reducing the possibility of further expansion and damage of the housing body 100.

[0155] Please refer to Figure 5 and Figure 10, in some embodiments, the cover plate assembly 300 further includes a seal 334; the seal 334 is sleeved on the outer periphery of the second pole column 331. The seal 334 can be made of materials such as rubber, and the seal 334 can be in interference fit with the second pole column 331, so that the sealing effect is better.

[0156] By providing the seal 334 on the outer periphery of the second pole column 331, the connection at the second pole column 331 isolates the electrode assembly 200, reducing the possibility of leakage of the electrolyte in the electrode assembly 200.

[0157] In some embodiments, the cover plate assembly 300 further includes a second electrode terminal, which is spaced apart from the first electrode terminal and has a different polarity.

[0158] The second electrode terminal may have the same structure as the first electrode terminal. For example, it includes a third pole column and a fourth pole column. The third pole column is installed on the movable plate 320 and is spaced apart from the first pole column 321; the fourth pole column is installed on the connecting plate 330 and is spaced apart from the second pole column 331; the side of the fourth pole column away from the movable plate 320 is electrically connected to the other tab 210 of the electrode assembly 200. Of course, the second electrode terminal may also have a different structure from the first electrode terminal. For example, the second electrode terminal is a conventional electrode terminal with only one pole column structure, and the second electrode terminal is spaced apart from the movable plate 320, and no special limitation is made thereto.

[0159] Through the cooperation of the second electrode terminal and the first electrode terminal, the conduction of the positive and negative electrodes of the battery cell 1100 with an external power source is realized.

[0160] In some embodiments, the number of the first electrode terminals is two, and the two first electrode terminals are spaced apart and have different polarities.

[0161] The two first electrode terminals are spaced apart and adapted to the positions of the two tabs 210, so as to facilitate the connection of the second pole columns 331 of the two first electrode terminals to the two tabs 210.

[0162] By providing two first electrode terminals with different polarities, they are connected to the two tabs 210 with different polarities of the electrode assembly 200, thereby realizing the conduction of the positive and negative electrodes of the battery cell 1100 with an external power source.

[0163] The battery cell 1100 provided by the embodiment of the present application includes a housing body 100, an electrode assembly 200, and a cover plate assembly 300. The housing body 100 is configured with a receiving cavity 110 having an opening 100a; the electrode assembly 200 is received in the receiving cavity 110; the cover plate assembly 300 is covered at the opening 100a; the cover plate assembly 300 includes a cover plate body 310, a first electrode terminal, a movable plate 320, a connecting plate 330, an elastic member 340 in a compressed state, an elastic clamping portion 350, a pressure relief valve 360, and a plug 370. The first electrode terminal includes a first pole column 321 and a second pole column 331; the movable plate 320 can move closer to or away from the cover plate body 310, and the first pole column 321 is installed on the movable plate 320; the connecting plate 330 is disposed on a side of the movable plate 320 facing away from the cover plate body 310 and is connected to the cover plate body 310, and the second pole column 331 is installed on the connecting plate 330, and a side of the second pole column 331 away from the movable plate 320 is electrically connected to the tab 210 of the electrode assembly 200; the movable plate 320 has a first position and a second position relative to the cover plate body 310; in the first position, the first pole column 321 abuts against the second pole column 331; in the second position, the first pole column 321 is separated from the second pole column 331. A guiding portion 312 is configured on a side of the cover plate body 310 close to the movable plate 320, and the guiding portion 312 penetrates the movable plate 320; the elastic member 340 is sleeved on the guiding portion 312 and abuts between the cover plate body 310 and the movable plate 320; the elastic member 340 can drive the movable plate 320 to move closer to or away from the cover plate body 310, so that the movable plate 320 switches between the first position and the second position. Specifically, the elastic member 340 applies a first elastic force to the movable plate 320, so that the movable plate 320 moves away from the cover plate body 310 and moves to the first position. When the air pressure generated inside the electrode assembly 200 is greater than the first elastic force, the movable plate 320 can move closer to the cover plate body 310 and move to the second position. The elastic clamping portion 350 is installed on the side cavity wall 3111 of the installation cavity 311 and protrudes toward the inner side of the installation cavity 311; the elastic clamping portion 350 and the side cavity wall 3111 of the installation cavity 311 jointly enclose an elastic deformation space 350a. When the movable plate 320 moves closer to the cover plate body 310 to a preset position, the elastic clamping portion 350 can be deformed, so that the movable plate 320 can cross over the elastic clamping portion 350, and the elastic clamping portion 350 supports the movable plate 320 to the second position. A side plug column 3113 protruding toward the inner side is further configured on the side cavity wall 3111 of the installation cavity 311; an avoidance hole 322 formed by inward depression is further configured on the outer side wall of the movable plate 320; in the first position, the avoidance hole 322 surrounds the outer periphery of the side plug column 3113; in the second position, along a direction perpendicular to the moving direction of the movable plate 320, the avoidance hole 322 does not coincide with the side plug column 3113.And at the second position, along the moving direction of the movable plate 320, there is a gap between the surface of the side plug post 3113 close to the bottom wall 3112 of the installation cavity 311 and the movable plate 320; so that the avoidance hole 322 and the side of the connecting plate 330 facing away from the movable plate 320 are penetrated to form a first air flow channel. The pressure relief valve 360 is installed on the cover body 310. At the second position, there is a gap between the pressure relief valve 360 and the side of the movable plate 320 facing away from the connecting plate 330 to form a second air flow channel; the second air flow channel is communicated with the first air flow channel. The number of the guiding parts 312 is at least one, and at least one guiding part 312 is configured with a diversion channel 3121; a liquid injection port 313 is configured on the cover body 310, and the liquid injection port 313 is communicated with the diversion channel 3121; the connecting plate 330 is further configured with a communication hole 332 penetrating along its own thickness direction; the communication hole 332 is communicated with the side of the diversion channel 3121 facing away from the liquid injection port 313. The plug 370 is detachably connected to the liquid injection port 313.

[0164] When the battery cell 1100 provided by the embodiment of the present application is in use, since the movable plate 320 of the cover assembly 300 has a first position and a second position when moving closer to or away from the cover body 310, when the battery cell 1100 is normally charged, the movable plate 320 can move relative to the cover body 310 to the first position, and the first pole column 321 abuts against the second pole column 331 (as Figure 12 shown), so that the external power supply can be electrically connected to the tab 210 of the electrode assembly 200. When the battery cell 1100 has an overcharge phenomenon during the charging process, the movable plate 320 can move relative to the cover body 310 to the second position, so that the first pole column 321 is separated from the second pole column 331 (as Figure 13As shown in the figure, the connection between the first electrode terminal and the tab 210 is disconnected, so that the external power supply is disconnected from the circuit connected to the tab 210, blocking the continuous overcharging, thus improving the service life and reliability of the battery. And the elastic member 340 in a compressed state is sleeved on the guiding portion 312 and abuts between the cover plate body 310 and the movable plate 320. Therefore, when the battery cell 1100 is normally charged, the elastic member 340 can apply a first elastic force to the movable plate 320, so that the movable plate 320 is in a first position relative to the cover plate body 310, and the first pole column 321 abuts against the second pole column 331, and then the abutment between the pole column and the tab 210 of the electrode assembly 200 is realized, so that the external power supply is electrically connected to the tab 210 and the electrode assembly 200 is charged. When the battery cell 1100 has an overcharging phenomenon and the internal pressure of the electrode assembly 200 rises abnormally, when the air pressure generated inside the electrode assembly 200 is greater than the first elastic force applied by the elastic member 340 to the movable plate 320, the movable plate 320 will move toward the side close to the cover plate body 310, so that the movable plate 320 moves relative to the cover plate body 310 to a second position, so that the first pole column 321 is separated from the second pole column 331, and then the external power supply is disconnected from the circuit connected to the tab 210, blocking the continuous overcharging, and improving the service life and reliability of the battery.

[0165] And by installing the elastic clamping portion 350 on the cavity side wall of the installation cavity 311, the elastic clamping portion 350 protrudes toward the inner side of the installation cavity 311. Therefore, when the movable plate 320 moves close to the cover plate body 310 to a preset position, the elastic clamping portion 350 can be deformed, so that the movable plate 320 can cross the elastic clamping portion 350 at the moment when the elastic clamping portion 350 is deformed, and finally the elastic clamping portion 350 supports the movable plate 320 to the second position, so as to avoid the situation that the first pole column 321 and the second pole column 331 are in multiple abutments and multiple separations when the air pressure generated by the electrode assembly 200 is unstable and the air pressure changes in magnitude after the battery cell 1100 is overcharged. When the overcharging danger occurs for the first time, the battery cell 1100 can quickly cut off the electrical connection between the external power supply and the electrode assembly 200, so that the reliability of the battery cell 1100 during use is higher. At the same time, when in the first position, the avoidance hole 322 surrounds the outer periphery of the side plug column 3113, so that the connection between the avoidance hole 322 and the side plug column 3113 is in an approximately sealed state to protect the internal electrode assembly 200. And when in the second position, along the direction perpendicular to the movement direction of the movable plate 320, that is, parallel to Figure 6 and Figure 7In the plane of xx'yy', the avoidance hole 322 does not coincide with the side plug column 3113, that is, there is a distance between the surface of the side plug column 3113 close to the bottom wall 3112 of the installation cavity 311 and the movable plate 320, so that there is a distance between the side plug column 3113 and the avoidance hole 322. When the battery cell 1100 undergoes overcharging and causes the internal pressure of the electrode assembly 200 to rise abnormally and generate gas, the gas can flow and be discharged from the avoidance hole 322 and the side plug column 3113, avoiding further expansion and damage of the housing.

[0166] By providing a pressure relief valve 360 on the cover body 310, the reliability during the use of the battery cell 1100 is higher, and the risk of the battery bursting and the electrolyte leaking is reduced. In the second position, the pressure relief valve 360 has a distance from the side of the movable plate 320 facing away from the connecting plate 330 and forms a second air flow channel; the second air flow channel is connected to the first air flow channel. Thus, when the battery is overcharged and generates gas, it is equivalent to adding more air flow conduction paths composed of the first air flow channel and the second air flow channel. Therefore, compared with the traditional exhaust method, the gas has more paths and is exhausted more quickly, so the reliability of the battery is also higher. By providing the liquid injection port 313, the diversion channel 3121, and the communication hole 332, after the battery cell 1100 is assembled, the electrolyte can be injected through the liquid injection port 313, which is more convenient. By detachably connecting the plug 370 to the liquid injection port 313, the injection and replenishment of the electrolyte are more convenient.

[0167] Please refer to Figures 4 - 6 and Figure 11 and in combination with Figure 12 and Figure 13 , in some embodiments, the present application further provides a cover assembly 300, which includes a cover body 310, a first electrode terminal, a movable plate 320, and a connecting plate 330. The first electrode terminal includes a first pole column 321 and a second pole column 331; the movable plate 320 can move closer to or away from the cover body 310, and the first pole column 321 is installed on the movable plate 320; the connecting plate 330 is disposed on the side of the movable plate 320 facing away from the cover body 310 and is connected to the cover body 310, and the second pole column 331 is installed on the connecting plate 330. The side of the second pole column 331 away from the movable plate 320 is used for electrical connection with the tab 210 of the electrode assembly 200; the movable plate 320 has a first position and a second position relative to the cover body 310; in the first position, the first pole column 321 abuts against the second pole column 331 ( Figure 12 as shown); in the second position, the first pole column 321 is separated from the second pole column 331 ( Figure 13 as shown).

[0168] Assemble the cover plate assembly 300 provided in the embodiments of the present application with the electrode assembly 200 and the housing body 100 of the battery cell 1100 to form the battery cell 1100. Since the movable plate 320 of the cover plate assembly 300 has a first position and a second position when moving closer to or away from the cover plate body 310, when the battery cell 1100 is being normally charged, the movable plate 320 can move relative to the cover plate body 310 to the first position, and the first pole column 321 abuts against the second pole column 331 (as Figure 12 shown), so that the external power supply can be electrically connected to the tab 210 of the electrode assembly 200. When overcharging occurs during the charging process of the battery cell 1100, the movable plate 320 can move relative to the cover plate body 310 to the second position, so that the first pole column 321 is separated from the second pole column 331 (as Figure 13 shown), so as to disconnect the connection between the first electrode terminal and the tab 210, and further disconnect the circuit connected to the tab 210 by the external power supply, thereby blocking the continuous progress of overcharging, thus improving the service life and reliability of the battery.

[0169] Please refer to Figure 2 , in some embodiments, the present application further provides a battery device 1000, which includes a box body 1200 and the battery cell 1100 described in any one of the above embodiments. The box body 1200 is configured with an accommodation space; the battery cell 1100 is accommodated in the accommodation space.

[0170] The box body 1200 may include a first part 1210 and a second part 1220. The first part 1210 and the second part 1220 are covered with each other, and the first part 1210 and the second part 1220 jointly define an accommodation space for accommodating the battery cell 1100. The second part 1220 may be a hollow structure with an opening 100a at one end, and the first part 1210 may be a plate-like structure. The first part 1210 covers the opening 100a side of the second part 1220, so that the first part 1210 and the second part 1220 jointly define an accommodation space; the first part 1210 and the second part 1220 may also both be hollow structures with an opening 100a at one side, and the opening 100a side of the first part 1210 covers the opening 100a side of the second part 1220.

[0171] When the battery device 1000 is in use, since the pole columns of each battery cell 1100 include a first pole column 321 and a second pole column 331, the external power supply can be connected or disconnected from the battery device 1000 by moving the movable plate 320 of the cover plate assembly 300 relative to the cover plate body 310 to the first position or the second position, thereby blocking the continuous progress of overcharging and improving the service life and reliability of the battery device 1000.

[0172] Please refer to Figure 1 , in some embodiments, the present application further provides an electrical device, which includes the battery device 1000 described in any of the above embodiments. The battery device 1000 is used to provide electrical energy for the electrical device. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0173] When the electrical device provided by the embodiments of the present application is in use, since the movable plate 320 of the cover plate assembly 300 of the battery cell 1100 has a first position and a second position when moving closer to or away from the cover plate body 310, when the battery cell 1100 is normally charged, the movable plate 320 can move relative to the cover plate body 310 to the first position, and the first pole column 321 abuts against the second pole column 331 (as shown in Figure 12 ), so that the external power supply can be electrically connected to the tab 210 of the electrode assembly 200. When overcharging occurs during the charging process of the battery cell 1100, the movable plate 320 can move relative to the cover plate body 310 to the second position, so that the first pole column 321 is separated from the second pole column 331 (as shown in Figure 13 ), so that the connection between the first electrode terminal and the tab 210 is disconnected, and further the circuit connected to the tab 210 by the external power supply is disconnected, thereby blocking the continuous progress of overcharging, and finally improving the service life and reliability of the electrical device.

[0174] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some 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 all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: A housing body (100) configured with a receiving cavity (110) having an opening (100a); An electrode assembly (200) received in the receiving cavity (110); A cover plate assembly (300) covering the opening (100a); the cover plate assembly (300) includes: A cover plate body (310); A first electrode terminal including a first pole column (321) and a second pole column (331); A movable plate (320) capable of moving closer to or away from the cover plate body (310), and the first pole column (321) is mounted on the movable plate (320); A connecting plate (330) disposed on a side of the movable plate (320) facing away from the cover plate body (310) and connected to the cover plate body (310), the second pole column (331) is mounted on the connecting plate (330), and a side of the second pole column (331) away from the movable plate (320) is electrically connected to a tab (210) of the electrode assembly (200); The movable plate (320) has a first position and a second position relative to the cover plate body (310); in the first position, the first pole column (321) abuts against the second pole column (331); in the second position, the first pole column (321) is separated from the second pole column (331).

2. The battery cell according to claim 1, wherein A guiding portion (312) is configured on a side of the cover plate body (310) close to the movable plate (320), and the guiding portion (312) penetrates through the movable plate (320); The cover plate assembly (300) further includes an elastic member (340) in a compressed state, and the elastic member (340) is sleeved on the guiding portion (312) and abuts between the cover plate body (310) and the movable plate (320); The elastic member (340) can drive the movable plate (320) to move closer to or away from the cover plate body (310) so that the movable plate (320) switches between the first position and the second position.

3. The battery cell according to claim 2, wherein, The elastic member (340) applies a first elastic force to the movable plate (320) so that the movable plate (320) moves away from and moves to the first position relative to the cover plate body (310).

4. The battery cell according to claim 3, wherein When the air pressure generated inside the electrode assembly (200) is greater than the first elastic force, the movable plate (320) can move closer to the cover plate body (310) and move to the second position.

5. The battery cell according to any one of claims 2-4, characterized in that, The cover plate body (310) is configured with a mounting cavity (311); At least a part of the movable plate (320) is received in the mounting cavity (311) and can move closer to or away from the bottom wall (3112) of the mounting cavity (311) so that the movable plate (320) switches between the first position and the second position.

6. The battery cell according to claim 5, wherein The cover plate assembly (300) further includes an elastic clamping portion (350); The elastic clamping part (350) is installed on the side cavity wall (3111) of the installation cavity (311) and protrudes towards the inner side of the installation cavity (311); When the movable plate (320) moves closer to the cover plate body (310) to a preset position, the elastic clamping part (350) can be deformed so that the movable plate (320) can cross over the elastic clamping part (350), and the elastic clamping part (350) supports the movable plate (320) to the second position.

7. The battery cell according to claim 6, wherein The elastic clamping part (350) and the side cavity wall (3111) of the installation cavity (311) jointly enclose an elastic deformation space (350a).

8. The battery cell according to claim 6, wherein The elastic clamping part (350) includes at least two clamping arms (351) that are sequentially connected and arranged at an angle, and the maximum distance between at least one of the clamping arms (351) and the side cavity wall (3111) of the installation cavity (311) is greater than 0.

9. The battery cell according to claim 5, wherein, On the side cavity wall (3111) of the installation cavity (311), a side plug post (3113) protruding towards the inner side of the cavity is further constructed; On the outer side wall of the movable plate (320), an avoidance hole (322) formed by inward depression is further constructed; In the first position, the avoidance hole (322) surrounds the outer periphery of the side plug post (3113); In the second position, along the direction perpendicular to the movement direction of the movable plate (320), the avoidance hole (322) does not coincide with the side plug post (3113).

10. The battery cell according to claim 9, wherein In the second position, along the movement direction of the movable plate (320), there is a distance between the surface of the side plug post (3113) on the side close to the bottom wall (3112) of the installation cavity (311) and the movable plate (320).

11. The battery cell according to claim 9, wherein In the second position, the avoidance hole (322) and the side of the connecting plate (330) facing away from the movable plate (320) communicate to form a first air flow channel.

12. The battery cell according to claim 11, characterized in that, The cover plate assembly (300) further includes a pressure relief valve (360); The pressure relief valve (360) is installed on the cover plate body (310).

13. The battery cell according to claim 12, wherein In the second position, there is a distance between the pressure relief valve (360) and the side of the movable plate (320) facing away from the connecting plate (330) to form a second air flow channel; The second air flow channel is communicated with the first air flow channel.

14. The battery cell according to any one of claims 2-4 and 6-13, characterized in that The number of the guiding parts (312) is at least one, and at least one of the guiding parts (312) is constructed with a diversion channel (3121); On the cover plate body (310), a liquid injection port (313) is constructed, and the liquid injection port (313) is communicated with the diversion channel (3121); The connecting plate (330) is further constructed with a communication hole (332) penetrating along its own thickness direction; the communication hole (332) is communicated with the side of the diversion channel (3121) facing away from the liquid injection port (313).

15. The battery cell according to claim 14, wherein, The cover plate assembly (300) further includes a sealing plug (370); The sealing plug (370) is detachably connected to the liquid injection port (313).

16. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, The cover plate assembly (300) further includes a connecting piece (380); The connecting member (380) passes through the connecting plate (330) and is fixedly connected to the cover body (310).

17. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, An installation through hole (314) is further formed on the cover body (310); At least a part of the first pole column (321) is accommodated in the installation through hole (314); When the movable plate (320) switches between the first position and the second position relative to the cover body (310), the first pole column (321) can slide in the installation through hole (314).

18. The battery cell according to claim 17, characterized in that, The cover assembly (300) further includes an insulating member (390), the insulating member (390) is disposed on a side of the cover body (310) facing away from the movable plate (320), and the insulating member (390) surrounds the outer periphery of the installation through hole (314).

19. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, An exhaust hole (333) penetrating in the thickness direction is further formed on the connecting plate (330).

20. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, The cover assembly (300) further includes a sealing member (334); the sealing member (334) is sleeved on the outer periphery of the second pole column (331).

21. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, The cover assembly (300) further includes a second electrode terminal, the second electrode terminal is spaced apart from the first electrode terminal and has a different polarity.

22. The battery cell according to any one of claims 1-4, 6-13, and 15, characterized in that, The number of the first electrode terminals is two, the two first electrode terminals are spaced apart and have different polarities.

23. A cover plate assembly, characterized in that, The cover assembly includes: A cover body (310); A first electrode terminal, including a first pole column (321) and a second pole column (331); A movable plate (320), capable of moving closer to or away from the cover body (310), and the first pole column (321) is installed on the movable plate (320); A connecting plate (330), disposed on a side of the movable plate (320) facing away from the cover body (310) and connected to the cover body (310), the second pole column (331) is installed on the connecting plate (330), and a side of the second pole column (331) away from the movable plate (320) can be electrically connected to the tab (210) of the electrode assembly (200); The movable plate (320) has a first position and a second position relative to the cover body (310); in the first position, the first pole column (321) abuts against the second pole column (331); in the second position, the first pole column (321) is separated from the second pole column (331).

24. A battery device, characterized in that, Including: A box body, which is provided with an accommodation space; And The battery cell according to any one of claims 1-22, the battery cell is accommodated in the accommodation space.

25. An electrical device, characterized in that, Including: The battery device according to claim 24, the battery device is used to supply electric energy to the electrical device.

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