CN219832818U

CN219832818U - Battery monomer, battery and electric equipment

Info

Publication number: CN219832818U
Application number: CN202320815319.4U
Authority: CN
Inventors: 徐晓富
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-04-13
Filing date: 2023-04-13
Publication date: 2023-10-13
Anticipated expiration: 2033-04-13

Abstract

The embodiment of the application provides a battery monomer, a battery and electric equipment. The battery cell includes: an electrode assembly; an electrolyte; a case having a cavity for accommodating the electrode assembly and the electrolyte; and the accommodating assembly is connected to the outside of the shell, and the accommodating cavity of the accommodating assembly is communicated with the cavity. The battery monomer, the battery and the electric equipment provided by the embodiment of the application can improve the performance and the service life of the battery monomer.

Description

Battery monomer, battery and electric equipment

Technical Field

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

Background

The new energy is developed, the replacement between the traditional energy and the new energy is realized, the main way for solving the current energy supply and demand bottleneck, the environmental pressure relief and other problems is realized, and the method is also a basic guarantee for sustainable development. Electric vehicles, as an important component of sustainable development, will become the main stream of development in the vehicle industry.

The battery cell is taken as an important component of the electric vehicle, and the use performance and reliability of the battery cell seriously influence the use experience and the use safety of a user on the electric vehicle. Therefore, how to improve the service performance and reliability of the battery cell is a problem to be solved.

Disclosure of Invention

The embodiment of the utility model provides a battery monomer, a battery and electric equipment, which can improve the performance and service life of the battery monomer.

In a first aspect, there is provided a battery cell comprising: an electrode assembly; an electrolyte; a case having a cavity for accommodating the electrode assembly and the electrolyte; the accommodating assembly is arranged outside the shell, and the accommodating cavity of the accommodating assembly is communicated with the cavity.

In the embodiment of the utility model, the accommodating component is arranged outside the shell of the battery cell, and the accommodating cavity of the accommodating component is communicated with the cavity of the shell, so that under the condition that the pressure in the cavity is increased or the electrode component and the like in the cavity are expanded, the accommodating cavity of the accommodating component is used for accommodating the electrolyte, the gas and other emissions from the cavity so as to reduce the pressure in the battery cell, thereby reducing the leakage of the electrolyte and the like in the battery cell and even the risk of explosion of the battery cell, and improving the performance and the service life of the battery cell. On the other hand, under the condition that the pressure in the cavity is reduced, electrolyte can flow back into the cavity from the accommodating cavity, so that the loss of the electrolyte in the cavity can be reduced, and the performance and the service life of the battery cell are improved.

In one possible implementation, the containment assembly includes: the communication mechanism is arranged on the shell, and the accommodating cavity is communicated with the cavity through the communication mechanism.

In the embodiment of the application, the communication between the cavity and the accommodating cavity can be realized through the communication mechanism, so that under the condition that the pressure in the cavity is increased or the electrode assembly and the like in the cavity are expanded, the discharge of electrolyte, gas and the like in the cavity can enter the accommodating cavity through the communication mechanism, and the pressure in the cavity is reduced; electrolyte and the like in the accommodating cavity can enter the cavity through the communication mechanism under the condition that the pressure in the cavity is reduced, so that the loss of electrode liquid in the cavity is reduced.

In one possible implementation, the communication mechanism includes a first state and a second state, the communication mechanism being configured to: the accommodating cavity is communicated with the cavity under the condition that the communication structure is in a first state; alternatively, in the case where the communication mechanism is in the second state, the accommodation chamber and the cavity are not communicated.

In the embodiment of the application, the accommodating cavity and the cavity are communicated when the communicating mechanism is in the first state, and the accommodating cavity and the cavity are not communicated when the communicating mechanism is in the second state, so that the communication between the cavity and the accommodating cavity can be more reasonably controlled, the electrolyte in the cavity and the like can flow between the cavity and the accommodating cavity more reasonably, and the performance of the battery monomer is improved.

In one possible implementation, the communication mechanism is configured to: in the event that the pressure within the cavity is greater than or equal to a first threshold, the communication mechanism actuation switches from the second state to the first state.

In the embodiment of the application, under the condition that the pressure ratio in the cavity is large, the communication mechanism is switched to the first state, and the accommodating cavity and the cavity can be communicated. Therefore, the possibility that electrolyte and the like in the cavity enter the accommodating cavity when the pressure in the cavity is smaller can be reduced, and accordingly loss of the electrolyte in the shell can be reduced, and the performance and the service life of the battery are improved.

In one possible implementation, the battery cell includes: the first pressure release mechanism sets up to: under the condition that the pressure in the cavity is larger than or equal to the pressure relief threshold value of the first pressure relief mechanism, the first pressure relief mechanism is used for relieving the pressure of the cavity, and the pressure relief threshold value is larger than the first threshold value.

In the embodiment of the application, the first threshold value is smaller than the pressure release threshold value of the first pressure release mechanism of the battery cell, so that under the condition that the pressure in the cavity is increased or the electrode assembly in the cavity is expanded, the discharged electrolyte, gas and the like discharged from the shell are discharged to the accommodating cavity of the accommodating assembly instead of discharging the battery cell through the first pressure release mechanism, and the electrolyte and the like in the accommodating cavity can also at least partially flow back to the cavity, so that the loss of the electrolyte discharged from the battery cell can be reduced.

In one possible implementation, the containing assembly is configured to: in the event that the pressure of the containment chamber is greater than or equal to a second threshold, the containment assembly ruptures to depressurize the cavity and the containment chamber.

According to the battery cell provided by the embodiment of the application, the accommodating component is broken under the condition that the pressure in the accommodating cavity is larger than or equal to the second threshold value, so that the internal pressure of the battery cell can be outwards released, and the risk of explosion of the battery cell can be reduced.

In one possible implementation, the wall of the containment assembly is provided with a second pressure relief mechanism arranged to: and under the condition that the pressure in the accommodating cavity is greater than or equal to a second threshold value, the second pressure release mechanism releases pressure to the cavity and the accommodating cavity.

In the embodiment of the application, the second pressure release mechanism arranged on the accommodating component can release the internal pressure of the battery cell outwards under the condition that the pressure in the accommodating cavity is larger than or equal to the second threshold value, so that the risk of explosion of the battery cell can be reduced.

In one possible implementation, the accommodation volume of the accommodation chamber is less than or equal to 3 times the volume of the cavity.

In the embodiment of the application, the accommodating cavity with the accommodating volume being smaller than or equal to 3 times of the volume of the cavity is arranged, so that under the condition that the pressure in the cavity is increased, the accommodating cavity can accommodate as much as possible the discharged matters such as electrolyte, gas and the like discharged from the shell, and simultaneously, the occupied space of the accommodating component to the inside of the battery is reduced as much as possible, thereby reducing the influence of the accommodating component on the assembly of the battery.

In one possible implementation, the material of the containment assembly comprises an elastic material.

In the embodiment of the application, the containing assembly which comprises the elastic material is arranged, so that the containing assembly can expand the volume of the unoccupied space in the battery under the condition that the discharge of electrolyte, gas and the like in the containing assembly is increased, the space in the battery can be more reasonably utilized, and the influence of the containing assembly on the battery assembly can be reduced.

In one possible implementation, the accommodation volume of the accommodation chamber is less than or equal to 0.5 times the volume of the cavity.

In the embodiment of the application, when the material of the accommodating component comprises an elastic material, the accommodating cavity with the accommodating volume smaller than or equal to 0.5 times of the cavity volume is arranged, so that the accommodating cavity occupies as little space in the battery as possible, and the influence of the accommodating component on the battery assembly is reduced.

In one possible implementation, the battery cell includes a first wall provided with electrode terminals, and the receiving assembly is connected to the first wall.

In the embodiment of the application, the accommodating component can be arranged on the wall where the electrode terminals of the battery cells are positioned, so that the space inside the battery can be more reasonably utilized.

In one possible implementation, the first wall is provided with two electrode terminals, between which the containing assembly is arranged.

In the embodiment of the application, the containing component can be arranged between the two electrode terminals, so that the space inside the battery can be more reasonably utilized, and the influence of the containing component on the structural modification inside the battery is reduced.

In a second aspect, there is provided a battery comprising: the battery cell of the first aspect and any one of the possible implementations of the first aspect.

In a third aspect, there is provided a powered device comprising: the battery cell of the first aspect and any one of possible implementation manners of the first aspect, wherein the battery cell is configured to provide electric energy to the electric device.

Drawings

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

Fig. 2 is a schematic view of the structure of a battery according to an embodiment of the present application.

Fig. 3 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 4 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 5 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 6 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 7 is a schematic structural view of a top cover of a battery cell according to an embodiment of the present application.

Fig. 8 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of a battery provided by an embodiment of the present application.

Fig. 10 is a schematic block diagram of an electric device according to an embodiment of the present application.

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," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

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 battery cell is taken as an important component of the electric vehicle, and the use performance and reliability of the battery cell seriously influence the use experience and the use safety of a user on the electric vehicle. In the charge and discharge process, the battery cell, particularly the battery cell having a large alkali metal system or volume change rate, expands an internal electrode assembly and/or generates gas therein to increase the internal pressure of the battery cell, which may cause leakage of electrolyte and the like in the battery cell, and may even cause explosion of the battery cell.

In view of this, an embodiment of the present application provides a battery cell including: an electrode assembly; an electrolyte; a case having a cavity for accommodating the electrode assembly and the electrolyte; the accommodating component is arranged outside the shell, the accommodating cavity of the accommodating component is communicated with the cavity, and under the condition that the pressure in the cavity is increased or the electrode component in the cavity is expanded, the accommodating cavity of the accommodating component is used for accommodating the electrolyte, gas and other emissions from the cavity, so that the pressure in the battery monomer is reduced, the leakage of the electrolyte and the like in the battery monomer and even the risk of explosion of the battery monomer can be reduced, and the performance and the service life of the battery monomer can be improved. On the other hand, under the condition that the pressure in the cavity is reduced, electrolyte can flow back into the cavity from the accommodating cavity, so that the loss of the electrolyte in the cavity can be reduced, and the performance and the service life of the battery cell are improved.

The battery monomer provided by the embodiment of the application is suitable for batteries and electric equipment using the batteries.

The electric equipment provided by the embodiment of the application can be an energy storage system, a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.

In the following, for brevity, a vehicle is taken as an example to describe the electric device.

Fig. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel-oil vehicle, a gas vehicle or a new energy vehicle. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like.

The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being arranged to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1.

The battery 10 may be used for power supply of the vehicle 1. In some embodiments of the application, the battery 10 may be used as an operating power source for the vehicle 1, for the circuitry of the vehicle 1, for example, for the operating power requirements at start-up, navigation and operation of the vehicle 1.

In some embodiments of the application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is a schematic structural diagram of a battery 10 according to an embodiment of the present application.

The battery 10 may include a battery cell 20. The battery 10 may further include a case 50, and the battery cells 20 are accommodated in the case 50. The case 50 may provide a sealed environment for the battery cells 20, reducing the effect of liquids or other foreign matter on the charge or discharge of the battery cells 20.

In some embodiments, the case 50 may include a first case portion 51 and a second case portion 52, the first case portion 51 covering the second case portion 52, the first case portion 51 and the second case portion 52 together defining a sealed space for accommodating the battery cell 20. The first case portion 51 and the second case portion 52 may be hollow structures each having one side opened, and the case 50 having the sealed space 53 is formed by closing the opening side of the first case portion 51 to the opening side of the second case portion 52. Of course, the first and second case parts 51 and 52 may be of various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In some embodiments, battery 10 may also include other structures. For example, the battery 10 may further include a bus bar member for realizing parallel connection, serial connection, or series-parallel connection between the plurality of battery cells 20. The hybrid connection refers to an electrical connection manner between the plurality of battery cells 20, including both series connection and parallel connection.

The bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. For example, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding.

In some embodiments, the number of battery cells 20 may be one or more. If there are multiple battery cells 20, the multiple battery cells 20 may be directly connected in series, parallel or series-parallel, and then the whole of the multiple battery cells 20 is accommodated in the case 50; alternatively, a plurality of battery cells 20 may be connected in series, in parallel, or in series to form a battery module, and the plurality of battery modules may be connected in series, in parallel, or in series to form a unit and be accommodated in the case 50.

In an embodiment of the present application, the battery cell 20 may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like. The shape of the battery cell may include a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc. The battery cells 20 may include cylindrical battery cells, prismatic battery cells, or pouch battery cells in various packaging manners.

Fig. 3 is a schematic diagram of a partial cross section of a battery cell 20 according to an embodiment of the present application.

The battery cell 20 may include: an electrode assembly 22, an electrolyte, a case 21, and a receiving assembly 23.

In the embodiment of the present application, the case 21 has a cavity 211, and the cavity 211 is used to accommodate the electrode assembly 22 and the electrolyte; the accommodating assembly 23, the accommodating assembly 23 is disposed outside the housing 21, and the accommodating chamber 231 of the accommodating assembly 23 communicates with the cavity 211.

The shape of the case 21 may be determined according to the combined shape of one or more electrode assemblies 22. For example, the housing 21 may be a hollow rectangular parallelepiped or square or cylindrical body.

The cavity 211 may be provided therein as a single electrode assembly 22, or may be provided therein as a plurality of electrode assemblies 22. For example, the cavity 211 may be provided with two electrode assemblies 22.

The electrode assembly 22 may be composed of a positive electrode sheet, a negative electrode sheet, and a separator.

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 with the coated positive electrode active material layer, and the current collector without the positive electrode active material layer is used 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 with the coated negative electrode active material layer, and the current collector without the negative electrode active material layer is used 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. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The diaphragm is used for isolating the positive plate and the negative plate, and the diaphragm can be made of polypropylene or polyethylene and the like.

The structure of the electrode assembly 22 may include a roll-to-roll structure or a lamination structure, etc.

Electrolyte is contained in the cavity 211 of the case 21 and can act as an ion transfer between the positive electrode sheet and the negative electrode sheet.

The containment assembly 23 may comprise different shapes. Illustratively, the shape of the receiving assembly 23 may be rectangular, square, spherical, or the like. Illustratively, the shape of the containment assembly 23 may also be an irregular shape, for example, depending on the shape of the available space inside the battery.

In the embodiment of the present application, by providing the receiving assembly 23 outside the case 21 of the battery cell 20 and communicating the receiving cavity 231 of the receiving assembly 23 with the cavity 211 of the case 21, it is possible to increase the internal pressure of the cavity 211 or to expand the electrode assembly 22 inside the cavity 211, etc., and the receiving cavity 231 of the receiving assembly 23 is used to receive the electrolyte, gas, etc., discharged from the cavity 211, etc., so as to reduce the internal pressure of the battery cell 20, thereby reducing the risk of leakage of the electrolyte, etc., inside the case 21 or explosion of the battery cell 20, and thus improving the performance and service life of the battery cell 20. On the other hand, in the case where the internal pressure of the cavity 211 is reduced, the electrolyte can flow back from the accommodating chamber 231 into the cavity 211, so that the loss of the electrolyte or the like in the cavity 211 can be reduced, and the performance and the life of the battery cell 20 can be improved.

In some embodiments of the present application, the receiving assembly 23 is disposed outside the housing 21 and connected to the housing 21, and the receiving chamber 231 of the receiving assembly 23 may communicate with the cavity 211.

In some embodiments of the present application, the housing 21 may have an opening, and the receiving assembly 23 may cover the opening and be connected to the outside of the housing 21, thereby enabling communication between the cavity 211 and the receiving cavity 231.

In some embodiments of the present application, the manner in which the containment assembly 23 is connected to the housing 21 may include different forms. For example, a sealant may be used to connect the containment assembly 23 to the housing 21. For example, the receiving assembly 23 and the housing 21 may be coupled together by screw coupling. For another example, the receiving assembly 23 and the housing 21 may be coupled together by welding.

In some embodiments of the present application, the receiving assembly 23 further includes a communication mechanism 232, the communication mechanism 232 being disposed on the housing 21, the receiving chamber 231 being in communication with the cavity 211 through the communication mechanism 232.

As shown in fig. 4, the accommodating assembly 23 may include a communication mechanism 232, and the communication mechanism 232 is disposed at an end of the accommodating assembly 23 near the housing 21. The communication mechanism 232 is provided on the housing 21, and communication between the cavity 211 and the accommodation chamber 231 can be achieved by the communication mechanism 232.

The connection of the communication mechanism 232 to the housing 21 may include different forms. For example, the communication mechanism 232 may be directly connected to the housing 21, or may be connected to the housing 21 by other connectors.

In the embodiment of the present application, communication between the cavity 211 and the accommodating chamber 231 is achieved through the communication mechanism 232, so that in the case where the pressure inside the cavity 211 increases or the electrode assembly 22 inside the cavity 211 or the like expands, the discharge of the electrolyte, gas or the like in the cavity 211 can enter the accommodating chamber 231 through the communication mechanism 232, reducing the pressure inside the cavity 211; in the case where the pressure in the cavity 211 is reduced, the electrolyte or the like in the accommodation chamber 231 can enter the cavity 211 through the communication mechanism 232, thereby reducing the loss of the electrolyte in the cavity 211.

In some embodiments of the present application, the communication mechanism 232 includes a first state and a second state, the communication mechanism 232 being configured to: in the case where the communication mechanism 232 is in the first state, the accommodation chamber 231 and the cavity 211 communicate; alternatively, in the case where the communication structure 232 is in the second state, the accommodation chamber 231 and the cavity 211 are not communicated.

In the embodiment of the present application, the communication structure 232 is in the first state, and the cavity 211 and the accommodation chamber 231 communicate, so that the electrolyte or the like can circulate between the cavity 211 and the accommodation chamber 231. For example, the communication mechanism 232 may be a communication valve that is opened with the communication valve in the first state, and the cavity 211 and the accommodation cavity 231 communicate.

When the communication mechanism 232 is in the second state, there is no communication between the housing chamber 231 and the cavity 211, and the electrolyte or the like cannot flow between the cavity 211 and the housing chamber 231. For example, the communication mechanism 232 may be a communication valve that is closed with the communication valve in the second state, and the cavity 211 and the accommodation cavity 231 are not in communication.

According to the battery unit 20 provided by the embodiment of the application, the communication mechanism 232 is arranged, so that the accommodating cavity 231 is communicated with the cavity 211 when the communication mechanism 232 is in the first state, and the accommodating cavity 231 is not communicated with the cavity 211 when the communication mechanism 232 is in the second state, thereby more reasonably controlling the flow of electrolyte between the accommodating cavity 231 and the cavity 211, more reasonably controlling the pressure relief of the cavity 211, and reducing the possibility of leakage of the electrolyte when the electrolyte breaks through the shell 21.

On the other hand, by providing the communication mechanism 232, the backflow of the ground electrode liquid can be more reasonable, and the influence of the loss of the electrolyte on the performance of the battery cell 20 can be reduced.

In some embodiments of the application, the communication mechanism 232 is configured to: in the case where the pressure in the cavity 211 increases, the communication mechanism 232 can be switched from the second state to the first state, so that the discharge of the electrolyte, the gas, or the like in the cavity can be made into the accommodation chamber 231.

In some embodiments of the application, the communication mechanism 232 is configured to: in the case where the pressure in the cavity 211 is greater than or equal to the first threshold value, the communication mechanism 232 is switched from the second state to the first state.

Illustratively, the communication structure 232 may include a pressure sensitive device such that communication between the receiving chamber 231 and the cavity 211 may be achieved if the pressure within the cavity 211 increases to greater than or equal to a first threshold value. For example, the communication structure 232 may include a pressure relief valve that may be adjusted so that the pressure relief valve may be automatically opened when the pressure within the cavity 211 is greater than or equal to a first threshold value, and electrolyte or the like within the cavity 211 may enter the receiving cavity 231.

In the embodiment of the present application, in the case where the pressure ratio in the cavity 211 is large, the communication mechanism 232 is switched to the first state, and communication is possible between the accommodation chamber 231 and the cavity 211. In this way, the possibility that the electrolyte and the like in the cavity 211 enter the accommodating cavity 231 when the pressure in the cavity 211 is relatively small can be reduced, so that the loss of the electrolyte in the housing 21 can be reduced, and the performance and the service life of the battery can be improved.

In some embodiments of the application, the communication mechanism 232 is configured to: in the case where the pressure in the cavity 211 is reduced, the communication mechanism 232 in the accommodation chamber 231 can be switched from the second state to the first state, so that the electrolyte or the like in the accommodation chamber 231 can be made to enter the cavity 211.

In some embodiments of the present application, the communication mechanism 232 may switch from the second state to the first state in the event that the pressure within the cavity 211 is less than or equal to the target threshold. The target threshold is less than the first threshold.

Illustratively, as the temperature of the battery cell 20 decreases, when the pressure within the cavity 211 decreases between the target threshold and the first threshold, the communication mechanism 232 is in the second state, and there is no communication between the cavity 211 and the receiving chamber 231. When the pressure in the cavity 211 continues to decrease below the target threshold, the pressure difference between the accommodation chamber 231 and the cavity 211 may switch the communication mechanism 232 from the second state to the first state, and the electrolyte or the like in the accommodation chamber 231 may reflow back into the cavity 211.

In some embodiments of the present application, the battery cell 20 may include a first pressure relief mechanism 24, the first pressure relief mechanism 24 being configured to: in the case where the pressure in the cavity 211 is greater than or equal to the relief threshold of the first relief mechanism 24, the first relief mechanism 24 relieves the pressure in the cavity 211.

Wherein the pressure relief threshold of the first pressure relief mechanism 24 is greater than the first threshold.

For example, the first pressure relief mechanism 24 may be a pressure sensitive pressure relief mechanism, the first pressure relief mechanism 24 being actuated in case the internal pressure of the housing 21 reaches a pressure relief threshold. When the first pressure release mechanism 24 is actuated, the first pressure release mechanism 24 opens or breaks, and the electrolyte, gas, and other emissions in the housing 21 are discharged out of the battery cell 20.

Generally, the electrolyte of the battery cell 20 is discharged through the first pressure release mechanism 24, for example, an explosion-proof valve, and cannot flow back into the case 21 again.

In the embodiment of the present application, by setting the first threshold value smaller than the pressure release threshold value of the first pressure release mechanism 24 of the battery cell 20, it is possible to discharge the electrolyte, gas, etc. discharged from the housing 21 to the accommodating chamber 231 of the accommodating member 23 instead of discharging the battery cell 20 through the first pressure release mechanism 24, in the case where the pressure inside the cavity 211 increases or the electrode assembly 22, etc. inside the cavity 211 expands, and the electrolyte, etc. in the accommodating chamber 231 may also be at least partially returned to the cavity 211, so that the loss of the electrolyte discharged from the battery cell 20 may be reduced.

In some embodiments of the application, the containment assembly 23 is configured to: in the event that the pressure of containment chamber 231 is greater than or equal to the second threshold, containment assembly 23 ruptures to depressurize both chamber 211 and containment chamber 231.

When the pressure inside the accommodating chamber 231 is greater, the accommodating chamber 231 is ruptured by the pressure inside the accommodating chamber 231, and the electrolyte, gas, and other emissions inside the battery cell 20 are discharged to the outside.

In the case where the pressure in the cavity 211 increases to be greater than or equal to the first threshold value, the communication mechanism 232 is braked, and the discharge of the electrolyte, gas, or the like in the cavity 211 can enter the accommodation chamber 231. This increases the pressure in the accommodation chamber 231, and when the pressure in the accommodation chamber 231 increases to be greater than or equal to the second threshold value, the accommodation assembly 23 breaks.

Alternatively, the material of the accommodating member 23 constituting the accommodating chamber 231 may include an elastic material, so that the accommodating member 23 may be ruptured in the case where the pressure in the accommodating chamber 231 is greater than or equal to the second threshold value.

According to the battery cell 20 provided by the embodiment of the application, the accommodating assembly 23 can be broken under the condition that the pressure in the accommodating cavity 231 is greater than or equal to the second threshold value, so that the internal pressure of the battery cell 20 can be outwards released, and the risk of explosion of the battery cell 20 is reduced.

In some embodiments of the application, as shown in fig. 4, the wall of the containment assembly 23 is provided with a second pressure relief mechanism 233, the second pressure relief mechanism 233 being arranged to: in case the pressure in the accommodation chamber 231 is greater than or equal to the second threshold value, the second pressure release mechanism 233 releases the pressure to the hollow chamber 211 and the accommodation chamber 231.

The housing assembly 23 has a housing chamber 231 formed in a wall portion thereof, and thus, in a case where the pressure in the housing chamber 231 is equal to or higher than a second threshold value, the pressure in the space 211 and the housing chamber 231 can be released by the second pressure release mechanism 233.

In the case where the pressure in the cavity 211 increases to be greater than or equal to the first threshold value, the communication mechanism 232 is switched to the first state, and the discharge of the electrolyte, the gas, or the like in the cavity 211 can enter the accommodating chamber 231. This will cause the pressure within the receiving chamber 231 to increase and, in the event that the pressure within the receiving chamber 231 increases to greater than or equal to the second threshold value, the second pressure relief mechanism 233 of the receiving assembly 23 may open or rupture to relieve the pressure within the chamber 211 and the receiving chamber 231.

Optionally, the material of the accommodating component 23 that forms the accommodating cavity 231 may include an inelastic material, so that the pressure in the cavity 211 may be relieved by the second pressure relieving mechanism 233 when the pressure in the cavity 211 is greater than or equal to the second threshold.

In the embodiment of the present application, the second pressure release mechanism 233 provided in the accommodating assembly 23 can release the internal pressure of the battery cell 20 to the outside when the pressure in the accommodating cavity 231 is greater than or equal to the second threshold, so that the risk of explosion of the battery cell 20 can be reduced.

In embodiments of the present application, the second threshold value at which containment assembly 23 breaks and the second threshold value at which second pressure release mechanism 233 releases may be the same or may be different. The size of the second threshold may be determined according to the material of the receiving member 23, the receiving volume of the receiving chamber 231, and the like.

Of course, the first threshold may be less than the second threshold, the first threshold may be equal to the second threshold, or the first threshold may be greater than the second threshold.

In some embodiments of the present application, the receiving volume of the receiving cavity 231 is less than or equal to 3 times the volume of the cavity 211.

The size of the receiving volume considers the volume of the electrolyte, gas, etc. discharged due to various factors such as the expansion of the electrode assembly 22, the gas generation inside the battery cell 20, etc., so that the receiving cavity 231 can receive the electrolyte, gas, etc. discharged from the cavity 211 during the life cycle of the battery cell 20.

The accommodation volume refers to the maximum volume that the accommodation chamber 231 can accommodate. For example, for the non-deformable containing assembly 23, the volume of the containing cavity 231 thereof is fixed, and the containing volume is the volume of the containing cavity 231 of the containing assembly 23. For the deformable containing assembly 23, the volume of the containing cavity 231 can be increased with the increase of the discharge of electrolyte, gas and the like, and the containing volume is the maximum volume that the containing assembly 23 can contain (such as the maximum volume that the containing assembly 23 can contain before breaking).

In the embodiment of the present application, by providing the accommodating chamber 231 having the accommodating volume of less than or equal to 3 times the volume of the cavity 211, in the case where the pressure in the cavity 211 increases or the electrode assembly 22 or the like in the cavity 211 expands, the accommodating chamber 231 accommodates as much as possible the discharged electrolyte, gas or the like discharged in the cavity 211 while reducing the occupied space of the accommodating assembly 23 inside the battery as much as possible, so that the influence of the accommodating assembly 23 on the battery assembly can be reduced.

In some embodiments of the present application, the material of the receiving member 23 comprises an elastic material.

In some embodiments of the present application, the elastic material may include: latex, rubber, silica gel, polyvinyl chloride, or the like. For example, the material of the accommodating member 23 forming the accommodating chamber 231 may be nitrile rubber, neoprene rubber, butyl rubber, or the like.

The material of the portion of the accommodating member 23 forming the accommodating chamber 231 includes an elastic material, so that the volume of the accommodating chamber 231 can be changed according to the pressure change in the cavity 211 or the volume change of the electrolyte, gas, etc. discharged from the housing 21. For example, the volume of the receiving chamber 231 may increase as the discharge of electrolyte, gas, etc. in the cavity 211 increases; and the volume of the accommodating chamber 231 decreases with the backflow of the electrolyte or the like.

In the embodiment of the application, the accommodating component 23 made of elastic materials is arranged, so that under the condition that the discharge of electrolyte, gas and the like in the accommodating component 23 is increased, the accommodating component 23 can expand the volume of the unoccupied space in the battery, thereby more reasonably utilizing the space in the battery 10 and reducing the influence of the accommodating component 23 on the assembly of the battery 10.

In some embodiments of the present application, the housing assembly 23 comprises a resilient material having a housing volume of the housing cavity 231 less than or equal to 0.5 times the volume of the cavity 211.

That is, the accommodation volume of the accommodation chamber 231 may be set slightly larger than the accommodation member 23 including the inelastic material, with respect to the accommodation member 23 including the elastic material.

In the embodiment of the present application, when the material of the accommodating component 23 includes an elastic material, by providing the accommodating cavity 231 with an accommodating volume less than or equal to 0.5 times the volume of the cavity 211, the accommodating cavity 231 occupies as little space as possible inside the battery 10, so as to reduce the influence of the accommodating component 23 on the assembly of the battery 10.

In some embodiments of the present application, the material of the containment assembly 23 may comprise a non-elastic material.

Inelastic materials can include aluminum plastic film, polyethylene terephthalate (polyethylene glycol terephthalate, PET) plastic, polytetrafluoroethylene (poly tetra fluoroethylene, PTFE) plastic, fluorinated high density polyethylene (high density polyethylene, HDPE) plastic, and the like. For example, the material of the portion of the accommodation member 23 where the accommodation chamber 231 is formed may be PET plastic.

The material of the portion of the receiving member 23 where the receiving chamber 231 is formed includes an inelastic material so that the volume of the receiving chamber 231 is substantially constant and does not vary with the pressure variation in the cavity 211 or the volume variation of the electrolyte, gas, etc. discharged from the cavity 211.

In the embodiment of the application, by arranging the accommodating assembly 23 made of the non-elastic material, the strength of the accommodating assembly 23 can be improved, the influence of other parts outside the battery cell 20 on the extrusion of the accommodating assembly 23 can be reduced, and the performance of the accommodating assembly 23 can be improved.

In some embodiments of the present application, the housing assembly 23 is comprised of a non-elastic material, and the housing volume of the housing cavity 231 is less than or equal to 0.3 times the volume of the cavity 211.

That is, for the accommodation member 23 including the inelastic material, the volume of the accommodation chamber 231 thereof may be set smaller.

In the embodiment of the present application, when the material of the accommodating component 23 includes an inelastic material, the accommodating cavity 231 may be provided with a smaller accommodating volume, so that the accommodating component 23 occupies as little space as possible in the battery 10, and the influence of the accommodating component 23 on the assembly of the battery 10 is reduced.

In some embodiments of the present application, the battery cell 20 includes a first wall provided with the electrode terminal 213, and the receiving assembly 23 is connected to the first wall.

As shown in fig. 5, the battery cell 20 may further include two electrode terminals 213, the two electrode terminals 213 being a first electrode terminal 213a and a second electrode terminal 213b, respectively. The polarities of the two electrode terminals 213 are opposite. For example, when the first electrode terminal 213a is a positive electrode terminal, the second electrode terminal 213b is a negative electrode terminal. Each electrode terminal 213 is provided with a connection member, which is located between the case 21 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminal 213.

In the embodiment of the present application, the receiving assembly 23 may be disposed on the first wall where the electrode terminals 213 of the battery cells 20 are located, so that the space within the battery 10 may be more reasonably utilized.

In some embodiments of the present application, as shown in fig. 5, the housing 21 includes a top cover 212 and a bottom cover 214. The top cover 212 and the bottom cover 214 may be coupled to form the cavity 211 of the housing 21.

In some embodiments of the present application, as shown in fig. 5, the first wall is provided with two electrode terminals, and the receiving assembly 23 is disposed between the two electrode terminals 213. For example, a first electrode terminal 213a and a second electrode terminal 213b are provided on a first wall of the top cover 212, and the receiving assembly 23 is disposed between the first electrode terminal 213a and the second electrode terminal 213 b.

In some embodiments of the application, as shown in fig. 6, the housing 21 may also include two opposing sides 214. Wherein the two opposing sides 214 include a side 214a and a side 214b.

In some embodiments of the present application, two electrode terminals 213a and 213b may be disposed on two opposite sides 214a and 214b of the case 21, respectively.

The receiving assembly 23 may be disposed on a side 214 of the housing 21. The receiving assembly 23 may be disposed on at least one of the sides 214a and 214b. For example, as shown in fig. 6, the accommodation member 23 may be provided only on the side 214b. For another example, two receiving assemblies 23 may be provided at the side 214a and the side 214b, respectively.

In some embodiments of the present application, the receiving assembly 23 is disposed between the two electrode terminals 213 of the battery cell 20.

That is, in the embodiment of the present application, for the battery cell 20 in which the two electrode terminals 213 are disposed on the same wall, the receiving assembly 23 may be disposed between the two electrode terminals. Fig. 7 is a schematic view (top view) of the top cap 212 of the battery cell 20. The top cap 212 is provided with two electrode terminals 213 of the battery cell 20, and the first electrode terminal 213a has a coordinate x=x along the x-axis ₁ The coordinate of the second electrode terminal 213b along the x-axis is x=x ₂ . X=x on top cover 212 ₁ And x=x ₂ The region therebetween may be regarded as a region between the two electrode terminals 213, in which the receiving assembly 23 may be disposed.

In the embodiment of the application, the accommodating component 23 can be arranged between the two electrode terminals 213, so that the space inside the battery 10 can be more reasonably utilized, and the influence of the accommodating component 23 on the structural modification inside the battery 10 is reduced.

In some embodiments of the present application, the receiving assembly 23 may be disposed at a relatively upper position in the battery cell 20. For example, the receiving assembly 23 may be disposed on the top cover 212, or the receiving assembly 23 may be disposed at a position above the side 214 of the battery cell 20.

In some embodiments of the present application, the battery cell 20 may be an inverted cell battery cell 20. As shown in fig. 8, the battery cells 20 of the inverted electric cell have two electrode terminals 213 facing downward. For the battery cell 20 of the inverted electric cell, the receiving assembly 23 may be disposed on the second wall 215 opposite to the wall where the electrode terminal 213 is located.

In the embodiment of the present application, the accommodating component 23 is disposed at a relatively upper position of the battery cell 20, so that the accommodating component 23 preferentially accommodates the gas generated in the battery cell 20, and the electrolyte can be located in the cavity 211 as much as possible due to the gravity effect, so that the influence of the loss of the electrolyte in the cavity 211 on the performance of the battery cell 20 can be reduced.

The embodiment of the present application provides a battery and an electric device, and the battery 800 and the electric device 900 provided by the embodiment of the present application are described below with reference to fig. 9 and 10.

Fig. 9 shows a schematic block diagram of a battery 800 provided by an embodiment of the present application. As shown in fig. 9, the battery 800 includes: and a battery cell 20.

In some embodiments of the present application, the battery 800 further includes a case 50, and the case 50 is used to accommodate the battery cells 20.

The description of the battery cell 20 and the case 50 may refer to the relevant contents in fig. 2 to 8, and the disclosure is not repeated herein for brevity.

Fig. 10 is a schematic block diagram of a powered device 900 according to an embodiment of the present application. As shown in fig. 9, the powered device 900 includes: and the battery unit 20, the battery unit 20 is used for providing electric energy for the electric equipment.

The description of the battery cell 20 may refer to the relevant contents in fig. 2 to 8, and the disclosure is not repeated herein for brevity.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. 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

1. A battery cell, comprising:

an electrode assembly (22);

an electrolyte;

-a housing (21), the housing (21) having a cavity (211), the cavity (211) for accommodating the electrode assembly (22) and the electrolyte;

and the accommodating assembly (23) is arranged outside the shell (21), and the accommodating cavity (231) of the accommodating assembly (23) is communicated with the cavity (211).

2. The battery cell according to claim 1, wherein the housing assembly (23) comprises:

and the communication mechanism (232) is arranged on the shell (21), and the accommodating cavity (231) is communicated with the cavity (211) through the communication mechanism (232).

3. The battery cell of claim 2, wherein the communication mechanism (232) comprises a first state and a second state, the communication mechanism (232) being configured to:

-said housing cavity (231) and said cavity (211) are in communication with said communication means (232) in said first state; or alternatively, the process may be performed,

the accommodation chamber (231) and the cavity (211) are not in communication with each other with the communication mechanism (232) in the second state.

4. A battery cell according to claim 3, wherein the communication mechanism (232) is arranged to:

the pressure communication mechanism (232) switches from the second state to the first state in the event that the pressure within the cavity (211) is greater than or equal to a first threshold.

5. The battery cell of claim 4, wherein the battery cell comprises:

a first pressure relief mechanism (24), the first pressure relief mechanism (24) being arranged to: the first pressure relief mechanism (24) relieves pressure in the cavity (211) when the pressure in the cavity (211) is greater than or equal to a pressure relief threshold of the first pressure relief mechanism (24), wherein the pressure relief threshold is greater than the first threshold.

6. The battery cell according to claim 1, wherein the receiving assembly (23) is arranged to:

in case the pressure of the containment chamber (231) is greater than or equal to a second threshold value, the containment assembly (23) ruptures to depressurize the cavity (211) and the containment chamber (231).

7. The battery cell according to claim 1, wherein the wall of the receiving assembly (23) is provided with a second pressure relief mechanism (233), the second pressure relief mechanism (233) being arranged to:

the second pressure release mechanism (233) releases pressure to the cavity (211) and the accommodation chamber (231) when the pressure of the accommodation chamber (231) is greater than or equal to a second threshold value.

8. The battery cell according to claim 1, wherein the accommodation volume of the accommodation chamber (231) is less than or equal to 3 times the volume of the cavity (211).

9. The battery cell according to claim 1, wherein the material of the receiving member (23) comprises an elastic material.

10. The battery cell according to claim 9, wherein the accommodation volume of the accommodation cavity (231) is less than or equal to 0.5 times the volume of the cavity (211).

11. The battery cell according to any one of claims 1 to 10, characterized in that the battery cell comprises a first wall provided with electrode terminals (213), to which the housing assembly (23) is connected.

12. The battery cell according to claim 11, wherein the first wall is provided with two of the electrode terminals (213), and the housing assembly (23) is disposed between the two electrode terminals (213).

13. A battery, comprising:

the battery cell of any one of claims 1 to 12.

14. A powered device, comprising:

the battery cell of any one of claims 1-12, the battery cell to provide electrical energy to the powered device.