Battery cells, cover plate assemblies, battery devices, and power-consuming devices

Abstract

The present application relates to a battery cell, a cover plate assembly, a battery device and an electrical device. The battery cell includes a shell body, an electrode assembly and a cover plate assembly. The shell body is constructed with a receiving cavity having an opening; the electrode assembly is received in the receiving cavity; the cover plate assembly is covered at the opening, and includes a cover plate body, a first electrode terminal, a movable plate and a connecting plate. The first electrode terminal includes a first pole and a second pole; the movable plate can move closer 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 of the movable plate away from the cover plate body and is connected to the cover plate body, the second pole is mounted on the connecting plate, and the second pole is electrically connected to the pole lug of the electrode assembly on the side away from the movable plate; the movable plate has a first position and a second position relative to the cover plate body; in the first position, the first pole abuts the second pole; in the second position, the first pole is separated from the second pole. When this battery cell is in use, it can prevent overcharging from continuing.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, cover plate assemblies, battery devices, and electrical devices. Background Art

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. When a battery is overcharged, the battery voltage rises rapidly as polarization increases, causing irreversible changes in the structure of the positive electrode active material and decomposition of the electrolyte, generating large amounts of gas and heat, causing a sharp increase in battery temperature and internal pressure, thereby affecting the battery's service life and reliability. Summary of the Invention

[0003] In view of the above problems, the present application provides a battery cell, a cover plate assembly, a battery device and an electrical device, which can improve the service life and reliability of the battery.

[0004] In the first aspect, the present application provides a battery cell, which includes a shell body, an electrode assembly and a cover assembly. The shell body is constructed with a receiving cavity having an opening; the electrode assembly is received in the receiving cavity; the cover assembly is covered at the opening; the cover assembly includes a cover body, a first electrode terminal, a movable plate and a connecting plate. The first electrode terminal includes a first pole and a second pole; the movable plate can move toward or away from the cover body, and the first pole is mounted on the movable plate; the connecting plate is arranged on the side of the movable plate away from the cover body and is connected to the cover body, and the second pole is mounted on the connecting plate; the side of the second pole away from the movable plate is electrically connected to the pole ear of the electrode assembly; the movable plate has a first position and a second position relative to the cover body; in the first position, the first pole abuts the second pole; in the second position, the first pole is separated from the second pole.

[0005] In the battery cell provided in the embodiments of the present application, the movable plate of the cover assembly has a first position and a second position when it moves toward or away from the cover body. Therefore, when the battery cell is normally charged, the movable plate can move relative to the cover body to the first position, causing the first electrode terminal to abut against the second electrode terminal, thereby enabling an external power source to be electrically connected to the electrode tab of the electrode assembly. However, when the battery cell is overcharged during charging, the movable plate can move relative to the cover body to the second position, thereby separating the first electrode terminal from the second electrode terminal, thereby disconnecting the first electrode terminal from the tab, and further disconnecting the external power source from the circuit connected to the tab, thereby preventing continued overcharging and improving the battery's service life and reliability.

[0006] In some embodiments, a guide portion is constructed on one side of the cover body close to the movable plate, and the movable plate is passed through the guide portion; the cover assembly also includes an elastic member in a compressed state, which is sleeved on the guide portion and abuts between the cover body and the movable plate; the elastic member can drive the movable plate to move closer or farther relative to the cover body, so that the movable plate can switch between the first position and the second position.

[0007] By placing the elastic member on the guide portion and abutting between the cover body and the movable plate, the elastic member can apply an elastic force to the movable plate when the battery cell is normally charged, so that the movable plate is in a first position relative to the cover body, the first pole abuts the second pole, and the pole abuts the electrode tab of the electrode assembly, so that the external power supply is electrically connected to the tab and the electrode assembly is charged. When the battery cell is overcharged and the pressure inside the electrode assembly increases abnormally, when the air pressure generated inside the electrode assembly is greater than the elastic force applied to the movable plate by the elastic member, the movable plate will move toward the side close to the cover body, causing the movable plate to move to the second position relative to the cover body, separating the first pole from the second pole, and disconnecting the circuit connected to the external power supply and the tab, preventing continued overcharging and improving the battery's service life and reliability.

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

[0009] Since the elastic member in the compressed state abuts between the cover body and the movable plate, the elastic member applies a first elastic force to the movable plate, so that the movable plate has a movement tendency toward the side away from the cover body, thereby enabling the first pole to abut against the second pole, and the two are connected.

[0010] In some 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 a battery cell is overcharged, the electrolyte inside the electrode assembly may decompose to generate gas, resulting in a high gas pressure inside the electrode assembly. When the gas pressure generated inside the electrode assembly exceeds the first elastic force, it drives the movable plate toward the cover body to the second position, separating the first and second poles. This disconnects the external power supply and the circuit connected to the tab, preventing further overcharging.

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

[0013] By arranging a mounting cavity on the cover body and accommodating the movable plate at least partially in the mounting cavity, the cavity wall of the mounting cavity can protect the movable plate and form a moving space for the movable plate.

[0014] In some embodiments, the cover assembly further includes an elastic clip portion; the elastic clip portion is mounted on a side cavity wall of the mounting cavity and protrudes toward one side of the cavity of the mounting cavity; when the movable plate moves closer to a preset position relative to the cover body, the elastic clip portion can be deformed so that the movable plate passes over the elastic clip portion, and the elastic clip portion supports the movable plate to the second position.

[0015] By installing an elastic clamping portion on the side wall of the mounting cavity and protruding toward the inner side of the mounting cavity, the elastic clamping portion can deform when the movable plate moves relative to the cover plate body to a preset position, allowing the movable plate to pass over the elastic clamping portion at the moment of deformation. Finally, the elastic clamping portion supports the movable plate to a second position, thereby preventing the first and second poles from repeatedly contacting and separating due to unstable air pressure generated by the electrode assembly and changes in air pressure after the battery cell is overcharged. When the risk of overcharging first occurs, the battery cell can quickly cut off the electrical connection between the external power supply and the electrode assembly, thereby improving the reliability of the battery cell during use.

[0016] In some embodiments, the elastic clamping portion and the side wall of the installation cavity are jointly arranged to form an elastic deformation space.

[0017] By jointly enclosing an elastic deformation space with the elastic clamping part and the side cavity wall of the installation cavity, when the movable plate moves up, the elastic clamping part can be elastically deformed in the elastic deformation space when subjected to the abutment force of the movable plate. In other words, the elastic deformation space provides the space required for the elastic clamping part to undergo elastic deformation when subjected to the abutment force.

[0018] In some embodiments, the elastic clamping portion includes at least two clamping arms connected in sequence and arranged at an angle, and the maximum distance between at least one clamping arm and the side 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 that the movable plate can pass over the elastic clamping portion.

[0020] In some embodiments, a side blocking column protruding toward one side of the cavity is further constructed on the side cavity wall of the installation cavity; an avoidance hole formed by an inward recess 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 escape holes are arranged around the outer periphery of the side blocking posts, making the connection between the escape holes and the side blocking posts nearly sealed, protecting the electrode assembly inside. When in the second position, perpendicular to the movement direction of the movable plate, the escape holes and the side blocking posts do not overlap. This allows, when the battery cells are overcharged and the internal pressure of the electrode assembly increases abnormally, generating gas, the gas can flow through the escape holes and the side blocking posts and be discharged, preventing further expansion and damage to the shell.

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

[0023] Because there's a gap between the movable plate and the surface of the side blocking post near the bottom wall of the mounting cavity in the second position, there's also a gap between the side blocking post and the escape hole. This allows gas generated during overcharging to escape through the gap between the side blocking post and the escape hole, preventing further expansion and damage to the housing.

[0024] In some 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. By connecting the avoidance hole and the side of the connecting plate facing away from the movable plate, the first airflow channel is formed. When the battery is overcharged and generates gas, a venting channel is formed here, allowing the gas to be discharged as quickly as possible, thereby preventing further damage to the battery.

[0026] In some 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 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 embodiments, in the second position, the pressure relief valve is spaced apart from a side of the movable plate facing away from the connecting plate and forms a second air flow channel; the second air flow channel is connected to 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 an air flow conduction path composed of the first air flow channel and the second air flow channel. Compared with traditional exhaust methods, the gas has more paths and the exhaust is faster, so the battery reliability is also higher.

[0030] In some embodiments, there is at least one guide portion, and at least one guide portion is configured with a flow channel. The cover body is configured with a liquid injection port, which is connected to the flow channel. The connecting plate is also configured with a communication hole extending through its thickness, which is connected to the side of the flow channel facing away from the liquid injection port. The provision of the liquid injection port, flow channel, and communication hole facilitates the injection of electrolyte through the liquid injection port after the battery cell is assembled.

[0031] In some embodiments, the cover assembly further comprises a sealing plug which is detachably connected to the liquid injection port. By detachably connecting the sealing plug to the liquid injection port, it is more convenient to inject and replenish the electrolyte.

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

[0033] The present application uses a connector to fix the connection plate to the cover body, thereby making the connection between the connection plate and the cover body more stable, and the position of the second pole is not prone to relative shaking, thereby making the connection between the first pole and the pole ear more stable.

[0034] In some embodiments, a mounting hole is further constructed on the cover body; the first pole is at least partially accommodated in the mounting hole; when the movable plate switches between the first position and the second position relative to the cover body, the first pole can slide in the mounting hole.

[0035] By providing a mounting through hole on the cover body and allowing the first pole to be at least partially accommodated in the mounting through hole, when the movable plate switches between the first position and the second position relative to the cover body, the first pole can slide in the mounting through hole, thereby guiding the sliding of the first pole through the mounting through hole and protecting the outer periphery of the first pole, so that the first pole is more stable when switching from the first position to the second position.

[0036] In some 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 is disposed around the periphery of the mounting hole. The insulating member can insulate the periphery of the first terminal, thereby enhancing battery reliability during charging and use.

[0037] In some embodiments, the connecting plate is further provided with vent holes extending through the thickness thereof. By providing the vent holes on the connecting plate, when the battery is overcharged and generates gas, the vent holes can be quickly exhausted, thereby reducing the possibility of further expansion and damage to the housing.

[0038] In some embodiments, the cap plate assembly further includes a seal disposed around the outer periphery of the second electrode post. Providing the seal around the outer periphery of the second electrode post isolates the electrode assembly at the connection point at the second electrode post, thereby reducing the possibility of electrolyte leakage within the electrode assembly.

[0039] In some embodiments, the cover plate assembly further includes a second electrode terminal spaced apart from the first electrode terminal and having a different polarity. The second electrode terminal cooperates with the first electrode terminal to achieve electrical conduction between the battery cell and the positive and negative electrodes of an external power source.

[0040] In some embodiments, there are two first electrode terminals, which are spaced apart and have different polarities. By providing two first electrode terminals with different polarities, the two first electrode terminals can be connected to two tabs of different polarities of the electrode assembly, thereby achieving electrical conduction between the battery cell and the positive and negative electrodes of an external power source.

[0041] In a second aspect, the present application provides a cover assembly, comprising a cover 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 is capable of moving toward or away from the cover body, and the first pole is mounted on the movable plate; the connecting plate is disposed on a side of the movable plate facing away from the cover body and connected to the cover body, and the second pole is mounted on the connecting plate, and the side of the second pole facing away from the movable plate is used to electrically connect to the electrode tab of the electrode assembly; the movable plate has a first position and a second position relative to the cover body; in the first position, the first pole abuts the second pole; in the second position, the first pole is separated from the second pole.

[0042] The cover assembly provided in the embodiment of the present application is assembled with the electrode assembly and shell body of the battery cell to form a battery cell. Since the movable plate of the cover assembly has a first position and a second position when moving toward or away from the cover body, when the battery cell is normally charged, the movable plate can move to the first position relative to the cover body, abutting the first electrode terminal with the second electrode terminal, thereby enabling an external power source to be electrically connected to the electrode lug of the electrode assembly. When the battery cell is overcharged during charging, the movable plate can move to the second position relative to the cover body, thereby separating the first electrode terminal from the second electrode terminal, thereby disconnecting the first electrode terminal from the electrode lug, and further disconnecting the external power source from the circuit connected to the electrode lug, thereby preventing continued overcharging and improving the battery's service life and reliability.

[0043] In a third aspect, the present application provides a battery device comprising a housing and a battery cell according to any one of the above embodiments. The housing is configured with a receiving space; the battery cell is received in the receiving space.

[0044] When the battery device is in use, since the poles of each battery cell include a first pole and a second pole, the external power supply and the battery device can be connected or disconnected by moving the movable plate of the cover assembly relative to the cover body to the first position or the second position, thereby preventing the continued 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 a battery device as described in any one of the above embodiments, and the battery device is used to provide electrical energy to the electrical device. When the electrical device provided by the embodiment of the present application is in use, since the movable plate of the cover assembly of the battery cell has a first position and a second position when it moves closer to or away from the cover body, when the battery cell is normally charged, the movable plate can be moved to the first position relative to the cover body, and the first pole abuts the second pole, thereby enabling the external power supply to be electrically connected to the pole ear of the electrode assembly. When the battery cell is overcharged during the charging process, the movable plate can be moved to the second position relative to the cover body, thereby separating the first pole from the second pole, so that the connection between the first electrode terminal and the pole ear is disconnected, and the external power supply is disconnected from the circuit connected to the pole ear, blocking the continued overcharging, thereby ultimately 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 more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0048] Figure 1 A schematic structural diagram of a vehicle is provided as the electrical device provided in some embodiments of the present application.

[0049] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the battery device shown.

[0050] Figure 3 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

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

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

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

[0054] Figure 7 for Figure 5 The diagram shows the connection between the cover plate body and the elastic member in the cover plate assembly.

[0055] Figure 8 for Figure 7 A partial enlarged view of point C is shown.

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

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

[0058] Figure 11 for Figure 4 A cross-sectional view at AA is shown.

[0059] Figure 12 The movable plate is in the first position relative to the cover plate body. Figure 4 A cross-sectional view at BB is shown.

[0060] Figure 13 The movable plate is at the second position relative to the cover plate body. Figure 4 A cross-sectional view at BB is shown.

[0061] The accompanying drawings in the specific implementation manner are as follows:

[0062] 10,000-vehicles;

[0063] 1000-battery device;

[0064] 1100-battery monomer;

[0065] 100 - shell body; 100a - opening; 110 - accommodating cavity; 200 - electrode assembly; 210 - electrode tab;

[0066] 300-cover assembly;

[0067] 310 - cover body; 311 - mounting cavity; 3111 - side cavity wall; 3112 - bottom wall; 3113 - side blocking column; 312 - guide portion; 3121 - flow guide channel; 313 - liquid injection port; 314 - mounting through hole;

[0068] 320 - movable plate; 321 - first pole; 322 - avoidance hole; 323 - penetration hole;

[0069] 330 - connecting plate; 331 - second pole; 332 - communicating hole; 333 - exhaust hole; 334 - sealing member;

[0070] 340-elastic part;

[0071] 350-elastic clamping portion; 350a-elastic deformation space; 351-clamping arm;

[0072] 360-pressure relief valve;

[0073] 370-sealed;

[0074] 380-connector;

[0075] 390-Insulation;

[0076] 1200- cabinet; 1210- first part; 1220- second part; 2000- controller; 3000- motor. DETAILED DESCRIPTION

[0077] The following 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 are therefore only examples and are not intended to limit the scope of protection of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0079] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0080] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0081] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

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

[0083] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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 the present application.

[0084] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0085] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[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 electrode active material and 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 battery life and reliability.

[0087] Based on the above considerations, in order to solve the problem that the battery life and reliability will be affected when it is overcharged, the present application provides a battery cell, which can timely block the electrical connection between the pole and the tab under overcharge conditions, thereby disconnecting the external power supply from the circuit connected to the tab, thereby blocking the continued overcharging and ultimately improving the battery life and reliability.

[0088] The power battery formed by the battery cells disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0089] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

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

[0091] In some embodiments of the present application, the battery can serve not only as an operating power source for the vehicle 10000, but also as a driving power source for 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 Shown Figure 1 The battery includes a housing 1200 and a battery cell 1100, with the battery cell 1100 housed within the housing 1200. The housing 1200 is used to provide a storage space for the battery cell 1100 and can have various structures. In some embodiments, the housing 1200 can include a first portion 1210 and a second portion 1220, which overlap each other and together define a storage space for the battery cell 1100. The second portion 1220 may be a hollow structure with an opening 100a at one end, and the first portion 1210 may be a plate-like structure. The first portion 1210 covers the opening 100a side of the second portion 1220, so that the first portion 1210 and the second portion 1220 jointly define a storage space. The first portion 1210 and the second portion 1220 may also be hollow structures with an opening 100a at one end, with the opening 100a side of the first portion 1210 covering the opening 100a side of the second portion 1220. Of course, the box 1200 formed by the first portion 1210 and the second portion 1220 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0093] In a battery, there may be multiple battery cells 1100, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 1100. Multiple battery cells 1100 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 1100 is housed within a housing 1200. Alternatively, a battery may be constructed by first connecting multiple battery cells 1100 in series, in parallel, or in a hybrid configuration to form a battery module. The battery module is then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 1200. The battery may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 1100.

[0094] See also Figure 3 Combined with Figure 4-Figure 6 as well as Figure 11-13 , Figure 3 Shown Figure 2 The exploded view of the battery cell 1100 is shown. The battery cell 1100 is the smallest unit constituting the battery device 1000. Figure 4 A schematic diagram of a cover plate assembly 300 of a battery cell 1100 provided in some embodiments of the present application is shown. Figure 5 Shown Figure 4 A first schematic diagram of the exploded structure of the cover assembly 300 is shown. Figure 6 Shown Figure 4 A second schematic diagram of the exploded structure of the cover assembly 300 is shown. Figure 11 Shown Figure 4 A cross-sectional view at AA is shown. Figure 12 The movable plate 320 is shown in the first position relative to the cover body 310. Figure 4 A cross-sectional view at BB is shown. Figure 13 The movable plate 320 is shown in the second position relative to the cover body 310. Figure 4 A cross-sectional view at BB is shown.

[0095] Some embodiments of the present application provide a battery cell 1100, which includes a housing 100, an electrode assembly 200, and a cap assembly 300. The housing 100 is configured with a receiving cavity 110 having an opening 100a; the electrode assembly 200 is received in the receiving cavity 110; the cap assembly 300 covers the opening 100a; and the cap assembly 300 includes a cap body 310, a first electrode terminal, a movable plate 320, and a connecting plate 330. The first electrode terminal includes a first pole 321 and a second pole 331; the movable plate 320 can move toward or away from the cover body 310, and the first pole 321 is installed on the movable plate 320; the connecting plate 330 is arranged on the side of the movable plate 320 away from the cover body 310 and is connected to the cover body 310, and the second pole 331 is installed on the connecting plate 330, and the side of the second pole 331 away from the movable plate 320 is electrically connected to the pole ear 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 321 abuts the second pole 331; in the second position, the first pole 321 is separated from the second pole 331.

[0096] like 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 that cooperates with the cover plate assembly 300 to form an internal environment for the battery cell 1100, wherein the formed internal environment can be used to accommodate the electrode assembly 200, 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 placed over the opening 100a to form the internal environment of the battery cell 1100. Alternatively, the cover plate assembly 300 and the housing can be integrated. Specifically, the cover plate assembly 300 and the housing can form a common connection surface before other components are inserted into the housing. When the interior of the housing needs to be encapsulated, the cover plate assembly 300 is placed over the housing. The housing can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing can be determined based on the specific shape and size of the electrode assembly 200. The shell can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0097] The electrode assembly 200 is a component in the battery cell 1100 where electrochemical reactions occur. One or more electrode assemblies 200 may be contained in the shell. The electrode assembly 200 is mainly composed of a positive electrode sheet, a negative electrode sheet, and a separator provided between the positive electrode sheet and the negative electrode sheet, which are thermally composited to form a composite material strip, and the composite material strips are stacked. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 200, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 210. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 210 connects the electrode terminals to form a current loop.

[0098] The cover plate assembly 300 is a component that covers the opening 100a of the housing to isolate the internal environment of the battery cell 1100 from the external environment. The shape of the cover plate assembly 300 can be adapted to the shape of the housing to fit the housing. Optionally, the cover plate assembly 300 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation of the cover plate assembly 300 during compression and collision, providing the battery cell 1100 with greater structural strength and improved safety. The cover plate assembly 300 can be provided with functional components such as terminals. Terminals can be used to electrically connect to the electrode assembly 200 to transmit or receive electrical energy from the battery cell 1100. In some embodiments, the cover plate assembly 300 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 1100 reaches a threshold. The cover plate assembly 300 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not specifically limited in this embodiment of the present application. In some embodiments, an insulating structure may be provided inside the cover assembly 300 to isolate the electrical connection components in the housing from the cover assembly 300 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0099] In the battery cell 1100 provided in the embodiment of the present application, the movable plate 320 of the cover plate assembly 300 has a first position and a second position when it moves toward or away from the cover plate body 310, so that when the battery cell 1100 is normally charged, the movable plate 320 can move to the first position relative to the cover plate body 310, and the first pole 321 abuts against the second pole 331 (such as Figure 12 As shown), the external power source can be electrically connected to the tab 210 of the electrode assembly 200. When the battery cell 1100 is overcharged during charging, the movable plate 320 can move to the second position relative to the cover body 310, thereby separating the first pole 321 from the second pole 331 (as shown). Figure 13As shown), the connection between the first electrode terminal and the tab 210 is disconnected, thereby disconnecting the circuit connected to the external power supply and the tab 210, thereby blocking the continuation of overcharging, thereby improving the service life and reliability of the battery.

[0100] The battery cell 1100 provided in the embodiments of the present application can achieve overcharge protection by physically switching the charging circuit on and off. Unlike overcharge protection methods that rely on complex electronic control systems, this overcharge protection is achieved through a simple and reliable mechanical structure. Compared to electronic components, the cover plate assembly 300 is immune to failures in the overcharge protection function due to malfunctions, electromagnetic interference, or software algorithm errors. This significantly improves the reliability of overcharge protection, making the battery cell 1100 even more reliable.

[0101] It should be noted that the first electrode terminal may be a positive electrode terminal or a negative electrode terminal, and there is no special limitation on this.

[0102] The structure of the battery cell 1100 is described in detail below. Figure 7-10 , Figure 7 Shown Figure 5 The diagram shows a connection diagram of the cover plate body 310 and the elastic member 340 in the cover plate assembly 300. Figure 8 Shown Figure 7 A partial enlarged view of point C is shown. Figure 9 Shown Figure 5 A schematic diagram of the movable plate 320 in the cover plate assembly 300 is shown. Figure 10 Shown Figure 5 A schematic diagram of the connecting plate 330 in the cover plate assembly 300 is shown.

[0103] See also Figure 6 、 Figure 7 as well as Figure 11-13 In some embodiments, a guide portion 312 is constructed on one side of the cover body 310 close to the movable plate 320, and the guide portion 312 passes through the movable plate 320; the cover assembly 300 also includes an elastic member 340 in a compressed state, which is sleeved on the guide portion 312 and abuts between the cover 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 body 310, so that the movable plate 320 switches between the first position and the second position.

[0104] The guide portion 312 can have a columnar or prismatic structure. The guide portion 312 can be integrally formed with the cover body 310, or they can be separately processed and then welded or bonded to the cover body 310. The elastic member 340 can be a spring or a compressible elastic gasket that can deform and generate elastic force. The movable plate 320 is provided with a through-hole 323 that is compatible with the guide portion 312, allowing the guide portion 312 to pass through the movable plate 320.

[0105] By sleeved the elastic member 340 on the guide portion 312 and abutting it between the cover body 310 and the movable plate 320, the elastic member 340 can apply an elastic force to the movable plate 320 when the battery cell 1100 is normally charged, so that the movable plate 320 is in the first position relative to the cover body 310, and the first pole 321 abuts the second pole 331, thereby realizing the abutment between the pole and the pole ear 210 of the electrode assembly 200, so that the external power supply is electrically connected to the pole ear 210 and the electrode assembly 200 is charged. When the battery cell 1100 is overcharged 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 to the movable plate 320 by the elastic member 340, the movable plate 320 will move toward the side close to the cover body 310, thereby causing the movable plate 320 to move to the second position relative to the cover body 310, so that the first pole 321 is separated from the second pole 331, and the circuit connected to the external power supply and the tab 210 is disconnected, thereby blocking the continued overcharging and improving the service life and reliability of the battery.

[0106] See also Figure 12 In some embodiments, 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 body 310 and moves to the first position.

[0107] The magnitude of the first elastic force can be adaptively adjusted according to the magnitude of the gas 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 of the elastic member 340.

[0108] Since the elastic member 340 in a compressed state abuts between the cover body 310 and the movable plate 320, the elastic member 340 applies a first elastic force to the movable plate 320, so that the movable plate 320 has a movement tendency toward the side away from the cover body 310, thereby enabling the first pole 321 to abut against the second pole 331, and the two are connected.

[0109] See also Figure 13In 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 is overcharged, 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 higher gas 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 side of the cover body 310 to the second position, thereby separating the first pole 321 from the second pole 331, and then disconnecting the circuit connected to the external power supply and the electrode ear 210, preventing further aggravation of overcharging.

[0112] See also Figure 6 、 Figure 7 as well as Figure 11-13 In some embodiments, the cover body 310 is constructed with a mounting cavity 311; the movable plate 320 is at least partially accommodated 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 can switch between the first position and the second position.

[0113] The shape of the installation cavity 311 matches the shape of the movable plate 320 , so that the movable plate 320 can be easily moved in the installation cavity 311 .

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

[0115] See also Figure 7 Combined with Figure 8 and Figure 12 and Figure 13 In some embodiments, the cover assembly 300 further includes an elastic clip 350; the elastic clip 350 is mounted on the side cavity wall 3111 of the mounting cavity 311 and protrudes toward one side of the cavity of the mounting cavity 311; when the movable plate 320 moves closer to a preset position relative to the cover body 310, the elastic clip 350 can be deformed so that the movable plate 320 passes over the elastic clip 350, and the elastic clip 350 supports the movable plate 320 to the second position.

[0116] The elastic clamping portion 350 can be composed of multiple deformable elastic arms. 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 in danger of overcharging and air pressure is generated inside, the air pressure pushes the movable plate 320 toward the side close to the cover body 310, so that the elastic arms can deform under the abutment force of the movable plate 320, thereby causing the movable plate 320 to pass over the elastic clamping portion 350, so that 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 the present application, an elastic clip 350 is installed on the side wall of the mounting cavity 311, and the elastic clip 350 is protruded toward the inner side of the mounting cavity 311. This allows the movable plate 320 to deform when it moves relative to the cover body 310 to a predetermined position, allowing the movable plate 320 to pass over the elastic clip 350 at the moment of deformation. Finally, the elastic clip 350 supports the movable plate 320 to the second position. This prevents the first terminal 321 and the second terminal 331 from repeatedly contacting and separating when the air pressure generated by the electrode assembly 200 is unstable and changes in pressure after the battery cell 1100 is overcharged. When the risk of overcharging first occurs, the battery cell 1100 can quickly cut off the electrical connection between the external power supply and the electrode assembly 200, thereby improving the reliability of the battery cell 1100 during use.

[0118] It should be noted that when the battery is overcharged, the internal air pressure does not continue to rise steadily, and short-term fluctuations may occur. When the battery cell 1100 provided in the present application is overcharged and the internal pressure rises abnormally, the movable plate 320 overcomes the elastic force of the elastic member 340 under the action of air pressure and moves upward rapidly. When the movable plate 320 moves up to the preset position, the elastic clamping portion 350 can accurately block the upward movable plate 320. This can reduce the possibility that when the air pressure drops briefly, the movable plate 320 may move downward due to the action of the first elastic force, causing the first pole 321 and the second pole 331 to re-contact, allowing the overcharge current to flow again. The present application ensures that the movable plate 320 will not accidentally move downward when the air pressure fluctuates briefly through the presence of the elastic clamping portion 350, and stably maintains the disconnected state between the first pole 321 and the second pole 331.

[0119] See also Figure 8 In some embodiments, the elastic clamping portion 350 and the side cavity wall 3111 of the installation cavity 311 are jointly configured to form an elastic deformation space 350a.

[0120] The elastic deformation space 350a may be a triangular prism structure with a triangular cross section, or a pentagonal prism structure with a trapezoidal cross section, and there is no special limitation on this.

[0121] An elastic deformation space 350a is formed by jointly enclosing the elastic clamping portion 350 and the side cavity wall 3111 of the installation cavity 311, so that when the movable plate 320 moves upward, the elastic clamping portion 350 is subjected to the abutment force of the movable plate 320, and the elastic clamping portion 350 can be elastically deformed in the elastic deformation space 350a. That is to say, the elastic deformation space 350a provides the space for the elastic clamping portion 350 to undergo elastic deformation when subjected to the abutment force.

[0122] See also Figure 8 In some embodiments, the elastic clamping portion 350 includes at least two clamping arms 351 connected in sequence 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 may include two clamping arms 351 arranged at an angle. The two clamping arms 351 and the side cavity wall 3111 of the installation cavity 311 together form an elastic deformation space 350a with a triangular prism structure. Of course, the elastic clamping portion 350 may also include three or four clamping arms 351 connected in sequence and arranged at an angle to form an elastic deformation space 350a with a quadrangular 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, the clamping arm 351 can be elastically deformed and moved toward the side of the side cavity wall 3111 when subjected to the upward abutting force applied by the movable plate 320, so that the movable plate 320 can pass over the elastic clamping portion 350.

[0125] See also Figure 6 、 Figure 7 and Figure 11 In some embodiments, a side blocking column 3113 protruding toward one side of the cavity is further constructed on the side cavity wall 3111 of the mounting cavity 311; an avoidance hole 322 recessed inward is further constructed on the outer wall of the movable plate 320; in a first position, the avoidance hole 322 is arranged around the outer periphery of the side blocking column 3113; in a second position, along a moving direction perpendicular to the movable plate 320, the avoidance hole 322 and the side blocking column 3113 do not overlap.

[0126] The side blocking column 3113 may be a partially cylindrical structure, such as a semi-cylindrical structure, and the avoidance hole 322 may be adapted to the shape of the outer wall of the side blocking column 3113 .

[0127] When in the first position, the avoidance hole 322 is arranged around the outer periphery of the side blocking column 3113, so that the connection between the avoidance hole 322 and the side blocking column 3113 is in an approximately sealed state, protecting the internal electrode assembly 200. When in the second position, the movable plate 320 is perpendicular to the moving direction, that is, parallel to the moving direction. Figure 6 and Figure 7 In the plane of xx'yy', the avoidance hole 322 and the side blocking column 3113 do not overlap, so that when the battery cell 1100 is overcharged and the internal pressure of the electrode assembly 200 increases abnormally and produces gas, the gas can flow and be discharged from the avoidance hole 322 and the side blocking column 3113, avoiding further expansion and damage to the shell.

[0128] In some embodiments, in the second position, along the moving direction of the movable plate 320, there is a gap between the surface of the side blocking column 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 Figure 11-13 zz' direction in.

[0129] By setting the minimum distance between the side blocking column 3113 and the bottom wall 3112 of the mounting cavity 311 to be greater than the maximum thickness of the connecting plate 330, and by limiting the installation position of the elastic clip 350, when the movable plate 320 is supported on the elastic clip 350, there is a distance between the surface of the side blocking column 3113 close to the bottom wall 3112 of the mounting cavity 311 and the movable plate 320.

[0130] Because there is a gap between the surface of the side blocking pillar 3113 near the bottom wall 3112 of the mounting cavity 311 and the movable plate 320 in the second position, there is also a gap between the side blocking pillar 3113 and the escape hole 322. This allows gas generated during overcharging to be discharged from the gap between the side blocking pillar 3113 and the escape hole 322, preventing further expansion and damage to the housing.

[0131] In some embodiments, at the second position, the avoidance hole 322 is connected to a side of the connecting plate 330 facing away from the movable plate 320 to form a first airflow channel.

[0132] The first airflow channel is formed by the distance between the avoidance hole 322 and the side blocking column 3113. The first airflow channel is formed by the connection between the avoidance hole 322 and the side of the connecting plate 330 facing away from the movable plate 320. This allows for a venting channel to be formed when the battery is overcharged and generates gas, allowing the gas to be discharged quickly, thereby preventing further damage to the battery.

[0133] See also Figure 5 、 Figure 6 as well as Figure 11-13 In some embodiments, the cover plate assembly 300 further includes a pressure relief valve 360 ​​; the pressure relief valve 360 ​​is mounted on the cover plate body 310 .

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

[0135] By providing the pressure relief valve 360 ​​on the cover body 310 , the reliability of the battery cell 1100 during use is improved, and the risks of battery rupture and electrolyte leakage are reduced.

[0136] In some embodiments, in the second position, the pressure relief valve 360 ​​is spaced apart 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 limiting the thickness of the movable plate 320 itself to be smaller than the distance of the pressure relief valve 360 ​​relative to the clamping position of the elastic clamping portion 350, the pressure relief valve 360 ​​can be spaced apart from the side of the movable plate 320 away from the connecting plate 330 in the second position and form a second air flow channel.

[0138] The present application connects the second air flow channel with the first air flow channel, so that when the battery is overcharged and generates gas, it is equivalent to adding an air flow conduction path composed of the first air flow channel and the second air flow channel. As a result, compared with traditional exhaust methods, the gas has more paths and the exhaust is faster, thereby improving the reliability of the battery.

[0139] See also Figure 6 、 Figure 7 as well as Figure 11 In some embodiments, there is at least one guide portion 312, and at least one guide portion 312 is configured with a flow guide channel 3121; a liquid injection port 313 is configured on the cover body 310, and the liquid injection port 313 is connected to the flow guide channel 3121; the connecting plate 330 is also configured with a connecting hole 332 that passes through its own thickness direction; the connecting hole 332 is connected to the side of the flow guide channel 3121 away from the liquid injection port 313.

[0140] The liquid injection port 313 can be aligned with the central axis of the flow channel 3121, thereby facilitating processing and allowing the liquid to flow more smoothly therein. The communication hole 332 can also be aligned with the central axis of the flow channel 3121, thereby facilitating alignment processing of the liquid injection port 313, the flow channel 3121, and the communication hole 332.

[0141] The present application provides a liquid injection port 313 , a flow channel 3121 and a communication hole 332 , so that after the battery cell 1100 is assembled, electrolyte can be injected through the liquid injection port 313 , which is more convenient.

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

[0143] The sealing plug 370 may be interference fit with the liquid injection port 313 , so that the sealing plug 370 can better block the liquid injection port 313 .

[0144] The present application makes it more convenient to inject and replenish the electrolyte by detachably connecting the sealing plug 370 to the liquid injection port 313 .

[0145] See also Figure 5 and Figure 6 In some embodiments, the cover assembly 300 further includes a connector 380 ; the connector 380 passes through the connecting plate 330 and is fixedly connected to the cover body 310 .

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

[0147] In this application, the connecting plate 330 is fixedly connected to the cover body 310 through the connecting member 380, so that the connection between the connecting plate 330 and the cover body 310 is relatively stable, and the position of the second pole 331 is not prone to relative shaking, thereby making the connection between the first pole 321 and the pole ear 210 relatively stable.

[0148] See also Figure 5-Figure 7 In some embodiments, a mounting through hole 314 is further constructed on the cover body 310; the first pole 321 is at least partially accommodated in 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 in the mounting through hole 314.

[0149] The mounting hole 314 is spaced apart from the pressure relief valve 360 ​​. The diameter of the mounting hole 314 may be slightly larger than the outer diameter of the first pole 321 , thereby facilitating the sliding of the first pole 321 in the mounting hole 314 .

[0150] The present application provides a mounting through hole 314 on the cover body 310, and allows the first pole 321 to be at least partially accommodated in the mounting through hole 314, so that 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 in the mounting through hole 314, and then 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 be protected, so that the first pole 321 is relatively stable when switching from the first position to the second position.

[0151] See also Figure 5 as well as Figure 11-13 In some embodiments, 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 is disposed around the periphery of the mounting through hole 314 .

[0152] The insulating member 390 can be made of non-conductive materials such as plastic or rubber, so that the outer periphery of the first pole 321 can be insulated by the insulating member 390, thereby making the battery more reliable during charging and use.

[0153] See also Figure 5 、 Figure 6 and Figure 10 In some embodiments, the connecting plate 330 is further provided with an exhaust hole 333 extending along its thickness direction; specifically, the thickness direction of the connecting plate 330 is Figure 5 、 Figure 6 and Figure 10 The exhaust hole 333 may be provided below the pressure relief valve 360 ​​, and a support rib connected to the hole wall may also be provided in the exhaust hole 333 to prevent foreign matter from falling into the electrode assembly 200 below from the exhaust hole 333 .

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

[0155] See also Figure 5 and Figure 10In some embodiments, the cover assembly 300 further includes a seal 334, which is sleeved around the outer periphery of the second pole 331. The seal 334 can be made of a material such as rubber, and can have an interference fit with the second pole 331, thereby achieving a better sealing effect.

[0156] By providing a seal 334 on the outer periphery of the second electrode column 331 , the electrode assembly 200 is isolated at the connection point of the second electrode column 331 , thereby reducing the possibility of leakage of the electrolyte in the electrode assembly 200 .

[0157] In some embodiments, the cap 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 can have the same structure as the first electrode terminal, for example, including a third pole and a fourth pole, wherein the third pole is mounted on the movable plate 320 and spaced apart from the first pole 321; the fourth pole is mounted on the connecting plate 330 and spaced apart from the second pole 331; and the side of the fourth pole 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 can also have a different structure from the first electrode terminal, for example, the second electrode terminal can be a conventional electrode terminal with a single pole structure, and the second electrode terminal can be spaced apart from the movable plate 320, without any special limitation.

[0159] The second electrode terminal cooperates with the first electrode terminal to achieve conduction between the battery cell 1100 and the positive and negative electrodes of the external power source.

[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 matched with the positions of the two electrode tabs 210 , so as to facilitate connection between the second poles 331 of the two first electrode terminals and the two electrode tabs 210 .

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

[0163] The battery cell 1100 provided in the embodiment of the present application includes a housing 100, an electrode assembly 200, and a cover assembly 300. The housing 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 assembly 300 covers the opening 100a; and the cover assembly 300 includes a cover body 310, a first electrode terminal, a movable plate 320, a connecting plate 330, a compressed elastic member 340, an elastic clamping portion 350, a pressure relief valve 360, and a sealing plug 370. The first electrode terminal includes a first pole 321 and a second pole 331; the movable plate 320 can move toward or away from the cover body 310, and the first pole 321 is installed on the movable plate 320; the connecting plate 330 is arranged on the side of the movable plate 320 away from the cover body 310 and is connected to the cover body 310, and the second pole 331 is installed on the connecting plate 330, and the side of the second pole 331 away from the movable plate 320 is electrically connected to the pole ear 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 321 abuts the second pole 331; in the second position, the first pole 321 is separated from the second pole 331. A guide portion 312 is constructed on one side of the cover body 310 near the movable plate 320, and the guide portion 312 passes through the movable plate 320; an elastic member 340 is sleeved on the guide portion 312 and abuts between the cover 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 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 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 body 310 and move to the second position. The elastic engaging portion 350 is mounted on the side wall 3111 of the mounting cavity 311 and projects toward one side of the mounting cavity 311. Together, the elastic engaging portion 350 and the side wall 3111 of the mounting cavity 311 enclose an elastically deformable space 350a. When the movable plate 320 moves toward the cover body 310 to a predetermined position, the elastic engaging portion 350 deforms, allowing the movable plate 320 to pass over the elastic engaging portion 350, and the elastic engaging portion 350 supports the movable plate 320 to the second position. The side cavity wall 3111 of the mounting cavity 311 is also constructed with a side blocking column 3113 protruding toward one side of the cavity; the outer wall of the movable plate 320 is also constructed with an avoidance hole 322 formed by an inward recess; in the first position, the avoidance hole 322 is arranged around the outer periphery of the side blocking column 3113; in the second position, along the moving direction perpendicular to the movable plate 320, the avoidance hole 322 and the side blocking column 3113 do not overlap.Furthermore, in the second position, along the direction of movement of the movable plate 320, a gap exists between the surface of the side blocking column 3113 on the side closest to the bottom wall 3112 of the mounting cavity 311 and the movable plate 320. This allows the avoidance hole 322 to connect with the side of the connecting plate 330 facing away from the movable plate 320, forming a first airflow channel. The pressure relief valve 360 ​​is mounted on the cover body 310. In the second position, the pressure relief valve 360 ​​is spaced apart from the side of the movable plate 320 facing away from the connecting plate 330, forming a second airflow channel; the second airflow channel is connected to the first airflow channel. There is at least one guide portion 312, and at least one guide portion 312 is configured with a flow channel 3121. The cover body 310 is configured with a liquid injection port 313, which communicates with the flow channel 3121. The connecting plate 330 is also configured with a communication hole 332 extending through its thickness. The communication hole 332 communicates with the side of the flow channel 3121 facing away from the liquid injection port 313. A sealing plug 370 is detachably connected to the liquid injection port 313.

[0164] When the battery cell 1100 provided in the embodiment of the present application is in use, the movable plate 320 of the cover assembly 300 has a first position and a second position when it moves toward or away from the cover body 310, so that when the battery cell 1100 is normally charged, the movable plate 320 can move to the first position relative to the cover body 310, and the first pole 321 abuts against the second pole 331 (such as Figure 12 As shown), the external power source can be electrically connected to the tab 210 of the electrode assembly 200. When the battery cell 1100 is overcharged during charging, the movable plate 320 can move to the second position relative to the cover body 310, thereby separating the first pole 321 from the second pole 331 (as shown). Figure 13As shown in FIG, 1 ), the first electrode terminal is disconnected from the tab 210, thereby disconnecting the circuit connecting the external power source and the tab 210, preventing continued overcharging and improving the battery's service life and reliability. Furthermore, a compressed elastic member 340 is sleeved within the guide portion 312 and abutted between the cover body 310 and the movable plate 320. Thus, during normal charging of the battery cell 1100, the elastic member 340 can apply a first elastic force to the movable plate 320, causing the movable plate 320 to be in a first position relative to the cover body 310, abutting the first pole 321 against the second pole 331, and thereby achieving abutment between the pole poles and the tab 210 of the electrode assembly 200, thereby electrically connecting the external power source to the tab 210 and charging the electrode assembly 200. When the battery cell 1100 is overcharged 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 to the movable plate 320 by the elastic member 340, the movable plate 320 will move toward the side close to the cover body 310, thereby causing the movable plate 320 to move to the second position relative to the cover body 310, so that the first pole 321 is separated from the second pole 331, and the circuit connected to the external power supply and the pole ear 210 is disconnected, thereby blocking the continued overcharging and improving the service life and reliability of the battery.

[0165] An elastic clip 350 is installed on the sidewall of the mounting cavity 311, protruding toward the inner side of the mounting cavity 311. This allows the movable plate 320 to deform when it approaches the cover plate body 310 to a predetermined position. This allows the movable plate 320 to pass over the elastic clip 350 at the instant of deformation, ultimately supporting the movable plate 320 to the second position. This prevents the first terminal 321 from repeatedly contacting and separating from the second terminal 331 when the pressure generated by the electrode assembly 200 fluctuates and becomes unstable after the battery cell 1100 is overcharged. When the initial overcharge risk occurs, the battery cell 1100 can quickly disconnect the external power supply from the electrode assembly 200, thereby enhancing the reliability of the battery cell 1100 during use. At the same time, when in the first position, the avoidance hole 322 is arranged around the outer periphery of the side blocking column 3113, so that the connection between the avoidance hole 322 and the side blocking column 3113 is in an approximately sealed state, protecting 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 and Figure 7In the plane of xx'yy', the avoidance hole 322 and the side blocking column 3113 do not overlap. In other words, there is a gap between the surface of the side blocking column 3113 near the bottom wall 3112 of the mounting cavity 311 and the movable plate 320, thereby creating a gap between the side blocking column 3113 and the avoidance hole 322. When the battery cell 1100 is overcharged and the internal pressure of the electrode assembly 200 abnormally increases and gas is generated, the gas can flow and be discharged through the avoidance hole 322 and the side blocking column 3113, preventing further expansion and damage to the housing.

[0166] The provision of a pressure relief valve 360 ​​on the cover plate body 310 enhances the reliability of the battery cell 1100 during use, reducing the risk of battery rupture and electrolyte leakage. In the second position, the pressure relief valve 360 ​​is spaced from the side of the movable plate 320 facing away from the connecting plate 330, forming a second airflow channel; the second airflow channel is connected to the first airflow channel. This effectively adds an additional airflow path, formed by the first and second airflow channels, when the battery is overcharged and gas is generated. This provides more paths for gas to escape and allows for faster exhaust compared to traditional venting methods, thereby enhancing battery reliability. The provision of the liquid inlet 313, the flow channel 3121, and the connecting hole 332 facilitates electrolyte injection through the liquid inlet 313 after assembly of the battery cell 1100. The removable connection of the sealing plug 370 to the liquid inlet 313 facilitates electrolyte injection and replenishment.

[0167] See also Figure 4-Figure 6 as well as Figure 11 and combined 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 321 and a second pole 331; the movable plate 320 can move toward or away from the cover body 310, and the first pole 321 is installed on the movable plate 320; the connecting plate 330 is arranged on a side of the movable plate 320 away from the cover body 310 and is connected to the cover body 310, and the second pole 331 is installed on the connecting plate 330, and the side of the second pole 331 away from the movable plate 320 is used to electrically connect to the pole ear 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 321 abuts against the second pole 331 ( Figure 12 In the second position, the first pole 321 is separated from the second pole 331 ( Figure 13 shown).

[0168] The cover assembly 300 provided in the embodiment of the present application is assembled with the electrode assembly 200 of the battery cell 1100 and the shell body 100 to form the battery cell 1100. 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 to the first position relative to the cover body 310, and the first pole 321 abuts against the second pole 331 (as shown in FIG. Figure 12 As shown), the external power source can be electrically connected to the tab 210 of the electrode assembly 200. When the battery cell 1100 is overcharged during charging, the movable plate 320 can move to the second position relative to the cover body 310, thereby separating the first pole 321 from the second pole 331 (as shown). Figure 13 As shown), the connection between the first electrode terminal and the tab 210 is disconnected, thereby disconnecting the circuit connected to the external power supply and the tab 210, thereby blocking the continuation of overcharging, thereby improving the service life and reliability of the battery.

[0169] See also Figure 2 In some embodiments, the present application further provides a battery device 1000, which includes a housing 1200 and a battery cell 1100 as described in any of the above embodiments. The housing 1200 is configured with a receiving space; the battery cell 1100 is received in the receiving space.

[0170] The housing 1200 may include a first portion 1210 and a second portion 1220. The first portion 1210 and the second portion 1220 overlap each other and together define a storage space for accommodating the battery cell 1100. The second portion 1220 may be a hollow structure with an opening 100a at one end. The first portion 1210 may be a plate-like structure, with the first portion 1210 overlapping the opening 100a of the second portion 1220, so that the first portion 1210 and the second portion 1220 together define the storage space. The first portion 1210 and the second portion 1220 may also each be a hollow structure with an opening 100a at one end, with the opening 100a of the first portion 1210 overlapping the opening 100a of the second portion 1220.

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

[0172] See also Figure 1 In some embodiments, the present application further provides an electrical device, comprising the battery device 1000 described in any of the above embodiments, wherein the battery device 1000 is configured to provide electrical energy to the electrical device. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0173] When the electric device provided by the embodiment of the present application is in use, since the movable plate 320 of the cover assembly 300 of the battery cell 1100 has a first position and a second position when it moves toward or away from the cover body 310, when the battery cell 1100 is normally charged, the movable plate 320 can move to the first position relative to the cover body 310, and the first pole 321 abuts against the second pole 331 (such as Figure 12 As shown), the external power source can be electrically connected to the tab 210 of the electrode assembly 200. When the battery cell 1100 is overcharged during charging, the movable plate 320 can move to the second position relative to the cover body 310, thereby separating the first pole 321 from the second pole 331 (as shown). Figure 13 As shown), the connection between the first electrode terminal and the tab 210 is disconnected, thereby disconnecting the circuit connected to the external power supply and the tab 210, thereby blocking the continuation of overcharging, thereby ultimately 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The shell body (100) is configured with a receiving cavity (110) having an opening (100a); An electrode assembly (200) is accommodated in the accommodation cavity (110); A cover plate assembly (300) is provided to cover the opening (100a); the cover plate assembly (300) comprises: The cover plate body (310) is constructed with a mounting cavity (311); a side cavity wall (3111) of the mounting cavity (311) is further constructed with a side blocking column (3113) protruding toward one side of the cavity; A first electrode terminal, comprising a first pole (321) and a second pole (331); A movable plate (320) is at least partially accommodated in the installation cavity (311), and an inwardly recessed avoidance hole (322) is formed on the outer side wall of the movable plate (320); and the first pole (321) is installed on the movable plate (320); a connecting plate (330) disposed on a side of the movable plate (320) away from the cover plate body (310) and connected to the cover plate body (310); a second pole (331) mounted on the connecting plate (330); and a side of the second pole (331) away from the movable plate (320) being electrically connected to the pole lug (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); the movable plate (320) can move toward 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; In the first position, the first pole (321) abuts against the second pole (331), and the avoidance hole (322) is arranged around the outer periphery of the side blocking pole (3113); In the second position, the first pole (321) and the second pole (331) are separated, and along the moving direction perpendicular to the movable plate (320), the avoidance hole (322) and the side blocking column (3113) do not overlap, and along the moving direction of the movable plate (320), there is a gap between the surface of the side blocking column (3113) on the side close to the bottom wall (3112) of the installation cavity (311) and the movable plate (320), and the avoidance hole (322) and the side of the connecting plate (330) facing away from the movable plate (320) are connected to form a first airflow channel.

2. The battery cell according to claim 1, wherein: A guide portion (312) is constructed on one side of the cover plate body (310) close to the movable plate (320), and the guide portion (312) passes through the movable plate (320); The cover plate assembly (300) further comprises an elastic member (340) in a compressed state, wherein the elastic member (340) is sleeved on the guide 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 farther 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, characterized in that: The elastic member (340) applies a first elastic force to the movable plate (320) so as to move the movable plate (320) away from the cover plate body (310) and to the first position.

4. The battery cell according to claim 3, characterized in that 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 claim 1, characterized in that The cover plate assembly (300) further includes an elastic clamping portion (350); The elastic clamping portion (350) is mounted on a side cavity wall (3111) of the mounting cavity (311) and is protruded toward one side of the cavity of the mounting cavity (311); When the movable plate (320) moves closer to a preset position relative to the cover plate body (310), the elastic clamping portion (350) can be deformed so that the movable plate (320) passes over the elastic clamping portion (350), and the elastic clamping portion (350) supports the movable plate (320) to the second position.

6. The battery cell according to claim 5, characterized in that The elastic clamping portion (350) and the side cavity wall (3111) of the installation cavity (311) are jointly arranged to form an elastic deformation space (350a).

7. The battery cell according to claim 5, characterized in that The elastic clamping portion (350) comprises at least two clamping arms (351) connected in sequence 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.

8. The battery cell according to claim 1, wherein: The cover plate assembly (300) further includes a pressure relief valve (360); The pressure relief valve (360) is mounted on the cover plate body (310).

9. The battery cell according to claim 8, characterized in that In the second position, the pressure relief valve (360) is spaced apart 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 communicated with the first air flow channel.

10. The battery cell according to any one of claims 2 to 4, characterized in that: The number of the guide portion (312) is at least one, and at least one of the guide portions (312) is configured with a flow guide channel (3121); A liquid injection port (313) is formed on the cover plate body (310), and the liquid injection port (313) is connected to the flow guide 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 a side of the flow guide channel (3121) facing away from the liquid injection port (313).

11. The battery cell according to claim 10, characterized in that The cover plate assembly (300) further includes a sealing plug (370); The sealing plug (370) is detachably connected to the liquid injection port (313).

12. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The cover plate assembly (300) further includes a connecting member (380); The connecting piece (380) passes through the connecting plate (330) and is fixedly connected to the cover plate body (310).

13. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The cover plate body (310) is also provided with a mounting through hole (314); The first pole (321) is at least partially accommodated 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 (321) can slide in the mounting through hole (314).

14. The battery cell according to claim 13, characterized in that The cover plate assembly (300) further includes an insulating member (390), wherein the insulating member (390) is arranged on a side of the cover plate body (310) facing away from the movable plate (320), and the insulating member (390) is arranged around the periphery of the mounting through hole (314).

15. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The connecting plate (330) is also provided with an exhaust hole (333) extending through the connecting plate along its thickness direction.

16. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The cover plate assembly (300) further comprises a sealing member (334); the sealing member (334) is sleeved on the outer periphery of the second pole (331).

17. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The cover plate assembly (300) further comprises a second electrode terminal, which is spaced apart from the first electrode terminal and has a different polarity.

18. The battery cell according to any one of claims 1 to 9 and 11, characterized in that: The number of the first electrode terminals is two, and the two first electrode terminals are spaced apart and have different polarities.

19. A cover plate assembly, characterized in that: The cover plate assembly comprises: The cover plate body (310) is constructed with an installation cavity (311); a side cavity wall (3111) of the installation cavity (311) is further constructed with a side blocking column (3113) protruding toward one side of the cavity; A first electrode terminal, comprising a first pole (321) and a second pole (331); A movable plate (320) is at least partially accommodated in the installation cavity (311), and an inwardly recessed avoidance hole (322) is formed on the outer side wall of the movable plate (320); and the first pole (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 plate body (310) and connected to the cover plate body (310); a second pole (331) mounted on the connecting plate (330); and a side of the second pole (331) away from the movable plate (320) capable of being electrically connected to the pole lug (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); the movable plate (320) can move toward 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; In the first position, the first pole (321) abuts against the second pole (331), and the avoidance hole (322) is arranged around the outer periphery of the side blocking pole (3113); In the second position, the first pole (321) and the second pole (331) are separated, and along the moving direction perpendicular to the movable plate (320), the avoidance hole (322) and the side blocking column (3113) do not overlap, and along the moving direction of the movable plate (320), there is a gap between the surface of the side blocking column (3113) on the side close to the bottom wall (3112) of the installation cavity (311) and the movable plate (320), and the avoidance hole (322) and the side of the connecting plate (330) facing away from the movable plate (320) are connected to form a first airflow channel.

20. A battery device, characterized in that: include: The box body is constructed with a receiving space; as well as The battery cell according to any one of claims 1 to 18, wherein the battery cell is accommodated in the accommodation space.

21. An electrical device, characterized in that: include: The battery device as claimed in claim 20, wherein the battery device is used to provide electrical energy to the electrical device.

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