CN221201462U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery and an electric device. The battery comprises a battery monomer, a battery box, a power supply unit, a detection unit and a battery management unit, the pressure relief mechanism comprises a valve body, a movable assembly and an elastic piece, the valve body comprises a valve body and an electromagnet arranged on the valve body, the valve body is used for being fixed with the box body of the battery box, and the valve body is provided with a pressure relief hole; the movable assembly covers the pressure relief hole, a permanent magnet is arranged on the movable assembly, the permanent magnet is arranged opposite to the electromagnet, and the electromagnet is used for generating a repulsive action on the permanent magnet after being electrified so as to push the movable assembly to move in a direction away from the valve body; the elastic piece is arranged between the valve body and the movable assembly and is used for driving the movable assembly to reset; the power supply unit is connected with the electromagnet and is used for supplying power to the electromagnet; the detection unit is arranged in the battery box and is used for detecting the air pressure parameter of the battery; the battery management unit is respectively in communication connection with the power supply unit and the detection unit. The application improves the reliability of the battery.

Description

Battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery and an electric device.

Background

In recent years, with the rapid development of new energy technology, new energy automobiles are increasingly widely applied and gradually replace traditional fuel automobiles, and become one of the mainstream transportation means. The power battery is used as a power source of the new energy automobile and is one of core equipment of the new energy automobile.

The pressure release mechanism of the battery box is used as an exhaust device of the battery, and the reliability of the battery is directly affected.

Disclosure of utility model

The embodiment of the application provides a battery and an electric device, which can improve the reliability of the battery.

In a first aspect, an embodiment of the present application provides a battery, where the battery includes a battery unit, a battery box, a power supply unit, a detection unit, and a battery management unit, the battery box includes a box body and a pressure release mechanism disposed on the box body, the battery unit is disposed in the box body, the pressure release mechanism includes a valve body, a movable assembly, and an elastic member, the valve body includes a valve body and an electromagnet disposed on the valve body, the valve body is used for being fixed with the box body of the battery box, and the valve body is provided with a pressure release hole; the movable assembly covers the pressure relief hole, a permanent magnet is arranged on the movable assembly, the permanent magnet is arranged opposite to the electromagnet, and the electromagnet is used for generating a repulsive action on the permanent magnet after being electrified so as to push the movable assembly to move in a direction away from the valve body; the elastic piece is arranged between the valve body and the movable assembly and is used for driving the movable assembly to reset; the power supply unit is connected with the electromagnet and is used for supplying power to the electromagnet; the detection unit is arranged in the battery box and is used for detecting the air pressure parameter of the battery; the battery management unit is respectively in communication connection with the power supply unit and the detection unit.

In the above-mentioned scheme, when detecting that the inside atmospheric pressure of battery box is too big exceeds first default, gaseous can act on the movable cover by the pressure release hole, promotes movable assembly to the direction removal of keeping away from the valve body for the outside of gas discharge to the battery box. Meanwhile, the battery management unit controls the power supply unit to supply power to the electromagnet to provide a first voltage, the electromagnet is electrified to generate a magnetic field, a repulsive action is generated on the permanent magnet on the movable assembly, the opening amplitude of the movable assembly is controlled, the gas discharge inside the battery box is accelerated, and the exhaust efficiency is improved. When the internal air pressure of the battery box is recovered to be normal, the battery management unit controls the power supply circuit of the power supply unit for the electromagnet to be disconnected, the electromagnet is not electrified, the action between the electromagnet and the permanent magnet disappears, the movable assembly moves towards the direction of the valve body under the action of the elastic piece, the pressure relief mechanism is closed, secondary risks such as water inflow in the battery box are reduced, and the reliability of the battery is improved. When the pressure difference between the inside and the outside of the battery box occurs, and when the pressure difference between the inside and the outside of the battery box is larger than a second preset value, for example, during air transportation, the power supply unit can be only controlled to provide smaller second voltage for the electromagnet, so that the pressure release mechanism is opened and closed in a small extent, and the pressure release mechanism is equivalent to the action of the balance valve.

In some embodiments, the movable assembly includes a movable cover and a movable rod, the movable cover covering the pressure relief aperture; the movable rod is connected with the movable cover, penetrates through the valve body and is connected with the elastic piece.

In the scheme, through the cooperation of movable cover and movable rod, can improve the connection steadiness between movable assembly and the valve body.

In some embodiments, the movable lever comprises a lever body and a first limit seat, the lever body is connected with the movable cover, and the lever body passes through the valve body; the first limiting seat is detachably connected with the movable rod, and the elastic piece is arranged between the valve body and the first limiting seat.

In the scheme, the first limiting seat is detachably connected with the movable rod, so that the elastic piece is convenient to assemble and disassemble. If the elastic piece, the first limiting seat or the valve body is damaged, maintenance and replacement can be independently carried out, and the cost is reduced.

In some embodiments, the electromagnet is circumferentially disposed along the periphery of the movable rod.

In the scheme, the electromagnet is arranged on the periphery of the movable cover, so that the magnetic flux of the electromagnet can be ensured to a certain extent, and the occupied space can be reduced.

In some embodiments, the permanent magnets are circumferentially disposed along the outer circumference of the movable bar.

In the scheme, the permanent magnet and the electromagnet which are oppositely arranged are arranged along the periphery of the movable rod, so that acting force between the electromagnet and the permanent magnet can be enhanced.

In some embodiments, the movable assembly is provided with a recess in which the permanent magnet is embedded.

In the scheme, the permanent magnet is clamped in the groove of the movable assembly, so that the permanent magnet can be fixed, and the space can be saved.

In some embodiments, the valve body comprises a bracket and a second limiting seat, the bracket is fixed with the box body, and the bracket is provided with a pressure relief hole; the second limiting seat is detachably connected with the support, and the elastic piece is arranged between the second limiting seat and the movable assembly.

In the scheme, the second limiting seat is detachably connected with the support, and if the second limiting seat or the support is damaged, the second limiting seat or the support can be independently maintained or replaced, so that the cost is reduced.

In some embodiments, the pressure relief mechanism further includes a first seal disposed between the movable assembly and the valve body. The sealing performance between the movable assembly and the valve body can be improved through the first sealing piece.

In some embodiments, the pressure relief mechanism further includes a second seal disposed on a side of the valve body facing the tank and in contact with the tank. The second sealing member can improve sealing performance between the pressure release mechanism and the box body of the battery box.

In a second aspect, an embodiment of the present application further provides an electrical device, including the above battery, where the battery is used to provide electrical energy.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the application;

fig. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is a schematic view illustrating a structure of a battery module according to some embodiments of the present application;

fig. 4 is a schematic exploded view of a battery cell according to some embodiments of the present application;

FIG. 5 is a schematic diagram of a pressure relief mechanism according to some embodiments of the present application;

FIG. 6 is a schematic view of a portion of a pressure relief mechanism provided in some embodiments of the present application;

FIG. 7 is a block diagram of a battery provided in some embodiments of the application;

Fig. 8 is a schematic structural diagram of a first limiting seat according to some embodiments of the present application;

FIG. 9 is a schematic diagram of a movable assembly provided in some embodiments of the application;

FIG. 10 is a schematic view of a portion of a valve body provided in accordance with some embodiments of the present application;

Fig. 11 is an exploded view of a pressure relief mechanism provided in some embodiments of the present application.

Reference numerals illustrate:

1000. A vehicle; 100. a battery; 110. a battery box; 200. a controller; 300. a motor; 10. an upper cover; 30. a case; 400. a battery module; 20. a battery cell; 22. a housing; 21. an end cap; 26. an electrode terminal; 23. an electrode assembly; 500. a pressure release mechanism; 40. a valve body; 41. a valve body; 42. an electromagnet; 411. a pressure relief hole; 412. a through hole; 413. a bracket; 414. the second limiting seat; 415. a third ring segment; 416. a fourth ring segment; 50. a movable assembly; 51. a movable cover; 511. an annular step; 512. a groove; 52. A movable rod; 53. a permanent magnet; 521. a lever body; 522. the first limiting seat; 523. a first ring segment; 524. a second ring segment; 60. an elastic member; 71. a first seal; 72. a second seal; 600. a power supply unit; 610. an auxiliary power supply; 620. a relay; 700. a detection unit; 710. a first air pressure sensor; 720. a second air pressure sensor; 800. and a battery management unit.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

In the present application, the battery cells may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protrudes out of the current collector coated with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated to serve as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector without the negative electrode active material layer protrudes out of the current collector coated with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated to serve as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the battery cells, batteries and the like disclosed by the application can be used for forming the power utilization device, so that the stability of the battery performance and the service life of the battery are improved.

The cell may generate a certain amount of gas, such as hydrogen, during operation. If these gases are not effectively vented, the pressure within the battery compartment will continue to increase. If the pressure exceeds the bearing capacity of the battery box, the battery box may be exploded or leaked, thereby posing a serious threat to the surrounding environment and personal safety. The working principle of the pressure release mechanism such as the explosion-proof valve is to establish an adjustable ventilation channel inside the battery box. When the internal pressure of the battery box is increased, the valve is opened, so that the gas is released from the battery box, and the pressure is relieved. At present, after the battery thermal runaway occurs, the decompression mechanism is opened, and the opening amplitude is unstable, so that the state that the decompression mechanism is opened for a while and closed for a while is easily maintained, the exhaust efficiency is influenced, and even if the internal air pressure of the battery box is recovered to be normal after the decompression mechanism is opened, the decompression mechanism is not closed all the time, so that risks such as secondary short circuit and the like are caused by easy water inflow in the process of battery delivery or repair, and the reliability of the battery is reduced.

In order to solve the technical problem, the application provides a battery, when a detection unit detects that the internal air pressure of a battery box is too large to exceed a first preset value, air can act on a movable cover through a pressure relief hole to push a movable assembly to move in a direction away from a valve body, so that the air can be discharged to the outside of the battery box. Meanwhile, the battery management unit controls the power supply unit to supply power to the electromagnet to provide a first voltage, the electromagnet is electrified to generate a magnetic field, a repulsive action is generated on the permanent magnet on the movable assembly, the opening amplitude of the movable assembly is controlled, the gas discharge inside the battery box is accelerated, and the exhaust efficiency is improved. When the internal air pressure of the battery box is recovered to be normal, the battery management unit controls the power supply circuit of the power supply unit for the electromagnet to be disconnected, the electromagnet is not electrified, the action between the electromagnet and the permanent magnet disappears, the movable assembly moves towards the direction of the valve body under the action of the elastic piece, the pressure relief mechanism is closed, secondary risks such as water inflow in the battery box are reduced, and the reliability of the battery is improved. When the pressure difference between the inside and the outside of the battery box occurs, and when the pressure difference between the inside and the outside of the battery box is larger than a second preset value, for example, during air transportation, the power supply unit can be only controlled to provide smaller second voltage for the electromagnet, so that the pressure release mechanism is opened and closed in a small extent, and the pressure release mechanism is equivalent to the action of the balance valve.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a battery case 110 and a battery cell 20. In some embodiments, the battery case 110 may include an upper cover 10 and a case 30, the upper cover 10 and the case 30 being covered with each other, the upper cover 10 and the case 30 together defining a receiving chamber for receiving the battery cell 20. The case 30 may have a hollow structure with one end opened, and the upper cover 10 may have a plate-shaped structure, and the upper cover 10 covers the opening side of the case 30, so that the upper cover 10 and the case 30 together define a receiving cavity; the upper cover 10 and the case 30 may be hollow structures with one side open, and the open side of the upper cover 10 may be closed to the open side of the case 30. Of course, the battery case 110 formed by the upper cover 10 and the case 30 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

Fig. 3 is a schematic structural view of the battery module 400 shown in fig. 2. In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box body; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in a case. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery cell or a primary battery cell; but not limited to, lithium sulfur battery cells, sodium ion battery cells, or magnesium ion battery cells. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 4, fig. 4 is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional components.

The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with functional parts such as electrode terminals 26. The electrode terminals 26 may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case 22 is an assembly for cooperating with the end cap 21 to form an internal environment of the battery cell 20, which may be used to house the electrode assembly 23, electrolyte, and other components. The case 22 and the end cap 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. In some examples, the housing 22 is a hollow structure with one side open, and the end cap 21 is one and covers the opening of the housing 22. In other examples, the housing 22 is a hollow structure with two openings on two sides, and two end caps 21 are respectively covered on the two openings of the housing 22. It is also possible to integrate the end cap 21 and the housing 22, but specifically, the end cap 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then put into place with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the main body of the electrode assembly 23, and the portions of the positive and negative electrode sheets having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or located at two ends of the main body respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal 26 to form a current loop.

FIG. 5 is a schematic diagram of a pressure relief mechanism according to some embodiments of the present application; FIG. 6 is a schematic view of a portion of a pressure relief mechanism provided in some embodiments of the present application; fig. 7 is a block diagram of a battery provided in some embodiments of the application.

Referring to fig. 5-7 in combination, in a first aspect, an embodiment of the present application provides a battery 100, including a battery unit 20, a battery box 110, a power supply unit 600, a detection unit 700, and a battery management unit 800, where the battery box 110 includes a box body 30 and a pressure release mechanism 500, the pressure release mechanism 500 includes a valve body 40, a movable assembly 50, and an elastic member 60, the valve body 40 includes a valve body 41 and an electromagnet 42 disposed on the valve body 41, the valve body 41 is used for being fixed with the box body 30 of the battery box 110, and the valve body 41 is provided with a pressure release hole 411; the movable assembly 50 covers the pressure relief hole 411, the movable assembly 50 is provided with a permanent magnet 53, the permanent magnet 53 is arranged opposite to the electromagnet 42, and the electromagnet 42 is used for generating a repulsive action on the permanent magnet 53 after being electrified so as to push the movable assembly 50 to move in a direction away from the valve body 40; the elastic member 60 is disposed between the valve body 41 and the movable assembly 50, and is used for driving the movable assembly 50 to reset. The battery cell 20 is disposed inside the battery case 110; the power supply unit 600 is electrically connected with the electromagnet 42 and supplies power to the electromagnet 42; the detection unit 700 is disposed inside the battery case 110 for detecting an air pressure parameter of the battery 100; the battery management unit 800 is communicatively connected to the power supply unit 600 and the detection unit 700, respectively.

The valve body 41 may be coupled to the case 30 of the battery case 110 by means of bolts, snaps, welding, or the like. For example, bolt holes may be provided in the valve body 41, and the valve body 41 may be locked to the case 30 by bolts passing through the bolt holes. The pressure release hole 411 is a through hole, so that a portion of the movable assembly 50 is exposed from the pressure release hole 411. Part of the movable assembly 50 is located at the outer side of the battery case 110, and when the gas pressure inside the battery case 110 is excessively high, high-pressure gas can directly act on the movable assembly 50 to push the movable assembly 50 to move outwards to be opened.

The elastic member 60 may be a coil spring, a diaphragm spring, or the like. One end of the elastic member 60 abuts against the valve body 41, and the other end abuts against the movable assembly 50. Under normal air pressure inside the battery box 110, the elastic member 60 is in a certain compressed state, and has a pretightening force on the movable assembly 50, so that the pressure release mechanism 500 is in a closed state. When the air pressure inside the battery box 110 is too large, the air pushes the movable assembly 50 to move outwards, the elastic member 60 is further compressed, when the air pressure inside the battery box 110 is recovered to be normal, the electromagnet 42 is stopped to supply power, the elastic force of the elastic member 60 to the movable assembly 50 towards the inside of the battery box 110 is larger than the acting force of the air inside the battery box 110 to the movable assembly 50, so that the elastic release force of the elastic member 60 acts on the movable assembly 50, the movable assembly 50 moves towards the inner side of the battery box 110, and the movable assembly 50 gradually covers the pressure relief hole 411 of the closed valve body 40.

The electromagnet 42 is a device for generating electromagnetic force by energizing, and is a device in which a conductive winding matching the power of the electromagnet is wound around the outside of the iron core, and the coil to which current is applied has magnetism like a magnet. The electromagnet 42 is magnetized when energized, and the magnetization is lost when de-energized. The permanent magnet 53 is a permanent magnet, and is a material that maintains constant magnetism once magnetized.

The electromagnet 42 and the permanent magnet 53 may be disposed at a certain interval, and the electromagnet 42 generates a magnetic field to repel the permanent magnet 53 only when the electromagnet 42 is energized. When the air pressure inside the battery 100 returns to normal, the electromagnet 42 is not energized, and the action on the permanent magnet 53 is lost. The electromagnet 42 may be connected to a power supply unit 600, and the electromagnet 42 may be powered on or off by the power supply unit 600.

The power supply unit 600 may include an auxiliary power source 610 and a relay 620 electrically connected to each other, and the auxiliary power source 610 and the relay 620 are electrically connected to the electromagnet 42, respectively, to form a loop of a power supply circuit. The relay 620 controls the on-off of the power supply circuit, and outputs voltages of different magnitudes to the electromagnet 42 through the auxiliary power supply 610, so as to change the magnetic field intensity of the electromagnet 42. For example, when the battery 100 is applied to the aviation field, when a pressure difference occurs between the inside and the outside of the battery box 110 during air transportation, the auxiliary power supply 610 can output a smaller voltage to the electromagnet 42, so that the pressure release mechanism 500 is opened and closed by a small extent, and the pressure release mechanism 500 acts as a balance valve. When the battery 100 is out of control, the auxiliary power supply 610 can output a larger voltage to the electromagnet 42, so that the pressure release mechanism 500 is opened and closed greatly, and the gas in the battery box 110 is discharged faster.

The detecting unit 700 may be an air pressure sensor, a first air pressure sensor 710 may be disposed inside the battery case 110, a second air pressure sensor 720 may be disposed outside the battery case 110, and the difference between the internal and external air pressures of the battery case 110 may be obtained by obtaining the difference between the first air pressure sensor 710 and the second air pressure sensor 720. The value of the first air pressure sensor 710 may be obtained separately to obtain the air pressure value inside the battery case 110.

The Battery management unit 800 (BMS) is provided to intelligently manage and maintain the respective Battery cells 20, prevent the Battery 100 from being overcharged and overdischarged, extend the service life of the Battery 100, and monitor the state of the Battery 100. The battery management unit 800 may be communicatively connected to the first and second air pressure sensors 710 and 720 inside and outside the battery case 110, respectively, and also communicatively connected to the relay 620 of the power supply unit 600. The battery management unit 800 receives the data detected by the detection unit 700 and then controls the opening or closing of the relay 620, and may also control the magnitude of the output voltage of the auxiliary power source 610, thereby controlling the opening amplitude of the pressure release mechanism 500.

Illustratively, the control method of the pressure relief mechanism 500 includes the steps of:

S10, acquiring a first air pressure value inside the battery box 110 detected by the detecting unit 700.

The detecting unit 700 may be an air pressure sensor, a first air pressure sensor 710 may be disposed inside the battery case 110, and the battery management unit 800 obtains the value of the first air pressure sensor 710 to obtain the air pressure value inside the battery case 110.

S20, if the first air pressure value is larger than a first preset value.

The first preset value may be set according to design requirements, and is a critical value for thermal runaway of the battery 100.

S30, the power supply unit 600 is controlled to provide the electromagnet 42 with the first voltage.

The battery management unit 800 controls the relay 620 to be opened, the electromagnet 42 is electrified, and the first voltage can be set according to requirements, so that after the electromagnet 42 is electrified, the movable cover 51 can be pushed to move outwards to a larger extent, and compared with the mode of pushing only by the gas in the battery box 110, a larger acting force is provided, so that the pressure release mechanism 500 is always kept open to a larger extent.

In some embodiments, the step of acquiring the first air pressure value inside the battery box 110 detected by the detection unit 700 further includes:

s40, acquiring the air pressure difference between the inside and the outside of the battery box 110 detected by the detecting unit 700.

The first air pressure sensor 710 may be disposed inside the battery case 110, and the second air pressure sensor 720 may be disposed outside the battery case 110, and the difference between the inside and outside air pressures of the battery case 110 may be obtained by obtaining the difference between the first air pressure sensor 710 and the second air pressure sensor 720.

S50, if the air pressure difference value is larger than a second preset value;

S60, controlling the power supply unit 600 to provide a second voltage for the electromagnet 42; wherein the first voltage is greater than the second voltage.

When the battery 100 is applied to the aviation field, when a pressure difference occurs between the inside and the outside of the battery box 110 in the air transportation process, the auxiliary power supply 610 can output a smaller second voltage to the electromagnet 42, and the second voltage is smaller than the first voltage when the heat is out of control, so that the pressure release mechanism 500 is opened and closed in a small extent, and the pressure release mechanism 500 serves as a balance valve.

In the above-mentioned scheme, when the internal air pressure of the battery case 110 is too high, the air acts on the movable cover 51 through the pressure release hole 411 to push the movable assembly 50 to move away from the valve body 40, so that the air can be discharged to the outside of the battery case 110. Simultaneously, the electromagnet 42 is electrified to generate a magnetic field, which generates a repulsive action on the permanent magnet 53 on the movable assembly 50, controls the opening range of the movable assembly 50, accelerates the gas discharge in the battery box 110, and improves the exhaust efficiency. When the internal air pressure of the battery box 110 is recovered to be normal, the electromagnet 42 is not electrified, the action between the electromagnet and the permanent magnet 53 is eliminated, the movable assembly 50 moves towards the valve body 40 under the action of the elastic piece 60, the pressure release mechanism 500 is closed, secondary risks such as water inflow in the battery box 110 are reduced, and the reliability of the battery 100 is improved.

Fig. 6 is a schematic view of a portion of a pressure relief mechanism according to some embodiments of the present application. As shown in fig. 6, in some embodiments, the movable assembly 50 includes a movable cover 51 and a movable rod 52, the movable cover 51 covering the pressure relief aperture 411; the movable lever 52 is connected to the movable cover 51, and the movable lever 52 passes through the valve body 41 and is connected to the elastic member 60.

A through hole 412 may be provided in the valve body 41, and the movable rod 52 may be connected to the valve body 41 through the elastic member 60 after passing through the through hole 412, and the movable rod 52 may slide in the through hole 412 of the valve body 41.

The movable cover 51 and the valve body 41 may have a circular, rectangular or other polygonal shape. An annular step 511 may be formed in a recess in the valve body 41 on a side facing the movable cover 51 so that the movable cover 51 abuts against the step, thereby improving the sealing property between the valve body 41 and the movable cover 51. The movable rod 52 may be disposed at a middle position of the movable rod 52, and similarly, may be disposed at a middle position of the valve body 41 so that the movable assembly 50 is balanced during movement.

In the above-described aspect, the connection stability between the movable assembly 50 and the valve body 41 can be improved by the cooperation of the movable cover 51 and the movable lever 52.

In some embodiments, the movable lever 52 includes a lever body 521 and a first stopper 522, the lever body 521 being connected to the movable cover 51, the lever body 521 passing through the valve body 41; the first limiting seat 522 is detachably connected to the movable rod 52, and the elastic member 60 is disposed between the valve body 41 and the first limiting seat 522.

An external thread may be disposed at one end of the movable rod 52 far away from the movable cover 51, the first limiting seat 522 is disposed with an internal thread, and the first limiting seat 522 is connected with the movable rod 52 through a thread. One of the movable rod 52 and the first limiting seat 522 may be provided with a protrusion, and the other one may be provided with a recess, so that the movable rod 52 and the first limiting seat 522 may be detachably connected by the engagement of the protrusion and the recess.

Fig. 8 is a schematic structural diagram of a first limiting seat according to some embodiments of the present application. As shown in fig. 8, the first limiting seat 522 may include a first ring segment 523 and a second ring segment 524 sequentially connected along an axial direction of the movable rod 52, where an edge of the second ring segment 524 is disposed in a protruding manner with respect to an edge of the first ring segment 523, so that an end portion of the elastic element 60 can be abutted against the second ring segment 524.

In the above-mentioned scheme, the first limiting seat 522 is detachably connected with the movable rod 52, so as to facilitate the disassembly and assembly of the elastic member 60. If the elastic member 60, the first limiting seat 522 or the valve body 41 is damaged, maintenance and replacement can be independently performed, thereby reducing the cost.

In some embodiments, the electromagnet 42 is circumferentially disposed along the outer periphery of the movable rod 52.

The electromagnet 42 is arranged in the through hole 412 of the valve body 41, the middle of the electromagnet 42 is of a hollow structure, the electromagnet 42 is sleeved on the periphery of the movable rod 52, and the movable rod 52 can slide relative to the electromagnet 42.

In the above-mentioned scheme, the electromagnet 42 is arranged on the periphery of the movable cover 51, so that the magnetic flux of the electromagnet 42 can be ensured to a certain extent, and the occupied space can be reduced.

In some embodiments, the permanent magnet 53 is circumferentially disposed along the outer circumference of the movable rod 52.

The permanent magnet 53 and the electromagnet 42 may be sequentially arranged at intervals in the same axial direction. The permanent magnet 53 may be fixed to the movable cover 51, and disposed along the outer circumference of the movable rod 52 near one end of the movable cover 51; alternatively, the permanent magnet 53 may be provided only along the outer periphery of the movable rod 52 without being fixed to the movable cover 51.

In the above-described embodiment, the force between the electromagnet 42 and the permanent magnet 53 can be enhanced by designing the permanent magnet 53 and the electromagnet 42 to be disposed along the outer periphery of the movable rod 52.

Fig. 9 is a schematic structural view of a movable assembly according to some embodiments of the present application. As shown in fig. 9, in some embodiments, the movable assembly 50 is provided with a recess 512, and the permanent magnet 53 is embedded in the recess 512.

For example, the groove 512 may be disposed on the movable cover 51 and disposed around the periphery of the movable rod 52, which is an annular groove 512. Correspondingly, the permanent magnet 53 is a ring-shaped magnet and is fixed in the groove 512, and the permanent magnet 53 is circumferentially arranged along the periphery of the movable rod 52.

In the above-mentioned scheme, by clamping the permanent magnet 53 in the groove 512 of the movable assembly 50, not only the permanent magnet 53 can be fixed, but also the space can be saved.

FIG. 10 is a schematic view of a portion of a valve body according to some embodiments of the present application. As shown in fig. 10, in some embodiments, the valve body 41 includes a bracket 413 and a second limiting seat 414, the bracket 413 is used for being fixed with the case 30 of the battery case 110, and the bracket 413 is provided with a pressure release hole 411; the second limiting seat 414 is detachably connected with the bracket 413, and the elastic piece 60 is arranged between the second limiting seat 414 and the movable assembly 50.

The movable rod 52 passes through the second limiting seat 414 and can slide relative to the second limiting seat 414. The second limiting seat 414 can be detachably connected with the bracket 413 through a bolt, a buckle or a pin and the like. The second limiting seat 414 may also include a third ring segment 415 and a fourth ring segment 416 sequentially connected along the axial direction of the movable rod 52, where an edge of the fourth ring segment 416 is protruding relative to an edge of the third ring segment 415, so that an end of the elastic element 60 can be abutted against the fourth ring segment 416, and the bracket 413 is also convenient to be connected and fixed with the fourth ring segment 416.

In the above scheme, the second limiting seat 414 is detachably connected with the bracket 413, if the second limiting seat 414 or the bracket 413 is damaged, maintenance or replacement can be independently performed, and the cost is reduced.

In some embodiments, pressure relief mechanism 500 further includes a first seal 71, first seal 71 being disposed between movable assembly 50 and valve body 41.

FIG. 10 is a schematic view of a portion of a valve body provided in accordance with some embodiments of the present application; fig. 11 is an exploded view of a pressure relief mechanism provided in some embodiments of the present application.

Referring to fig. 10 and 11 in combination, the first seal 71 may be a fluororubber, nitrile rubber, silicone rubber, polytetrafluoroethylene, neoprene rubber, or the like. The first seal 71 may be fixed to the side of the valve body 41 facing the movable cover 51 by adhesion, clamping, or the like, and the first seal 71 may improve the sealing performance between the movable cover 51 and the valve body 41.

In some embodiments, the pressure relief mechanism 500 further includes a second seal 72, the second seal 72 being disposed on a side of the valve body 41 facing the case 30 and in contact with the case 30 of the battery case 110.

The second seal 72 may be a fluororubber, nitrile rubber, silicone rubber, polytetrafluoroethylene, neoprene, or the like. The second seal member 72 may be fixed to the valve body 41 on the side facing the inside of the battery case 110 by adhesion, engagement, or the like, and after the valve body 41 is attached to the case 30 of the battery case 110, the second seal member 72 is engaged between the valve body 41 and the case 30 of the battery case 110. The second seal 72 can improve the sealing performance between the pressure release mechanism 500 and the case 30 of the battery case 110.

In a second aspect, an embodiment of the present application further provides an electrical device, including the above battery 100, where the battery 100 is configured to provide electrical energy.

According to some embodiments of the present application, there is provided a pressure relief mechanism 500, the pressure relief mechanism 500 including a valve body 40, a movable assembly 50 and an elastic member 60, the valve body 40 including a valve body 41 and an electromagnet 42 provided on the valve body 41, the valve body 41 being for fixing with a case 30 of a battery case 110, the valve body 41 being provided with a pressure relief hole 411; the movable assembly 50 covers the pressure relief hole 411, the movable assembly 50 is provided with a permanent magnet 53, the permanent magnet 53 is arranged opposite to the electromagnet 42, and the electromagnet 42 is used for generating a repulsive action on the permanent magnet 53 after being electrified so as to push the movable assembly 50 to move in a direction away from the valve body 40; the elastic member 60 is disposed between the valve body 41 and the movable assembly 50, and is used for driving the movable assembly 50 to reset. The movable assembly 50 comprises a movable cover 51 and a movable rod 52, wherein the movable cover 51 covers the pressure release hole 411; the movable lever 52 is connected to the movable cover 51, and the movable lever 52 passes through the valve body 41 and is connected to the elastic member 60.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery, comprising:

A battery cell;

The battery box comprises a box body and a pressure release mechanism arranged on the box body, and the battery unit is arranged in the box body; the pressure relief mechanism comprises a valve body, a movable assembly and an elastic piece, wherein the valve body comprises a valve body and an electromagnet arranged on the valve body, the valve body is used for being fixed with a box body of the battery box, and the valve body is provided with a pressure relief hole; the movable assembly covers the pressure relief hole, a permanent magnet is arranged on the movable assembly, the permanent magnet is arranged opposite to the electromagnet, and the electromagnet is used for generating a repulsive interaction on the permanent magnet after being electrified; the elastic piece is arranged between the valve body and the movable assembly and is used for driving the movable assembly to reset;

The power supply unit is connected with the electromagnetic iron and is used for supplying power to the electromagnet;

The detection unit is arranged in the battery box and is used for detecting the air pressure parameter of the battery;

and the battery management unit is respectively in communication connection with the power supply unit and the detection unit.

2. The battery of claim 1, wherein the movable assembly comprises:

A movable cover covering the pressure relief hole;

The movable rod is connected with the movable cover, penetrates through the valve body and is connected with the elastic piece.

3. The battery of claim 2, wherein the movable bar comprises:

The rod body is connected with the movable cover and penetrates through the valve body;

The first limiting seat is detachably connected with the movable rod, and the elastic piece is arranged between the valve body and the first limiting seat.

4. The battery of claim 2, wherein the electromagnet is circumferentially disposed along the periphery of the movable rod.

5. The battery of claim 4, wherein the permanent magnet is circumferentially disposed along the periphery of the movable rod.

6. The battery according to claim 1, wherein the movable assembly is provided with a groove, and the permanent magnet is embedded in the groove.

7. The battery of claim 1, wherein the valve body comprises:

The bracket is fixed with the box body and is provided with a pressure relief hole;

the second limiting seat is detachably connected with the support, and the elastic piece is arranged between the second limiting seat and the movable assembly.

8. The battery of any of claims 1-5, wherein the pressure relief mechanism further comprises a first seal disposed between the movable assembly and the valve body.

9. The battery of any one of claims 1-5, wherein the pressure relief mechanism further comprises a second seal disposed on a side of the valve body facing the housing and in contact with the housing.

10. An electrical device comprising a battery according to any one of claims 1-9 for providing electrical energy.