CN221282304U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, a battery and an electricity utilization device, wherein the battery monomer comprises a shell, an electrode assembly and an air guide mechanism, the shell comprises a first wall and a second wall which are oppositely arranged, the first wall is provided with a pressure release mechanism, the electrode assembly is accommodated in the shell, the air guide mechanism is accommodated in the shell and is provided with an air guide channel, and the air guide channel is used for communicating a space between the electrode assembly and the pressure release mechanism with a space between the second wall and the electrode assembly. Through the structure, the space between the electrode assembly and the pressure release mechanism in the battery cell can be communicated with the space between the second wall and the electrode assembly, so that gas between the second wall and the electrode assembly can smoothly reach the position of the pressure release mechanism without accumulation, and the gas generated by thermal runaway in the battery cell can be smoothly discharged through the pressure release mechanism, thereby being beneficial to improving the reliability of the battery cell.

Description

Battery monomer, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery and an electric device.

Background

The battery has the advantages of high specific energy, high power density and the like, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric tools and the like.

With the continuous expansion of the application range of batteries, the requirements of people on the working reliability of the batteries are also increasing. How to improve the reliability of batteries has been a focus of attention of those skilled in the art.

Disclosure of utility model

In view of the above, the present application provides a battery cell, a battery, and an electric device, the battery cell having good reliability.

In a first aspect, some embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, and an air guide mechanism, the housing comprising oppositely disposed first and second walls, the first wall being provided with a pressure relief mechanism; the electrode assembly is accommodated in the case; the air guide mechanism is accommodated in the shell and is provided with an air guide channel, and the air guide channel is used for communicating the space between the electrode assembly and the pressure release mechanism with the space between the second wall and the electrode assembly.

Through the structure, the space between the electrode assembly and the pressure release mechanism in the battery cell can be communicated with the space between the second wall and the electrode assembly, so that gas between the second wall and the electrode assembly can smoothly reach the position of the pressure release mechanism without accumulation, and the gas generated by thermal runaway in the battery cell can be smoothly discharged through the pressure release mechanism, thereby being beneficial to improving the reliability of the battery cell.

According to the battery cell provided by some embodiments of the application, the air guide mechanism comprises the air guide pipe and the flexible layer, the air guide pipe is provided with the air guide channel, and the flexible layer covers at least part of the air guide pipe and separates the electrode assembly from the air guide pipe, so that the damage of the electrode assembly caused by the direct contact of the air guide pipe and the electrode assembly is reduced.

According to some embodiments of the present application, a battery cell is provided, the electrode assembly including a body portion including a first end face facing a first wall and a second end face facing a second wall, and a tab connected to the body portion; the air duct comprises a first port and a second port along the self extending direction, the first port is flush with or extends out of the first end face of the main body part, and the second port is flush with or extends out of the second end face of the main body part, so that the air in the space between the second wall and the electrode assembly can smoothly flow to the position of the pressure relief mechanism through the air duct, and the air duct can be conveniently discharged.

According to the battery monomer provided by some embodiments of the application, the elastic modulus of the air duct is larger than that of the flexible layer, the flexible layer is easy to deform, the air duct is not easy to deform, and the reduction of the air duct capacity of the air duct mechanism caused by extrusion is facilitated.

According to the battery cell provided by some embodiments of the application, the flexible layer comprises a first clamping layer and a second clamping layer, and the air duct is connected between the first clamping layer and the second clamping layer, so that good separation between the air duct and the electrode assembly is realized.

According to the battery cell provided by some embodiments of the application, the electrode assembly comprises a plurality of pole pieces which are arranged in a stacked manner, and the air guide mechanism is clamped between two adjacent pole pieces, so that the air guide mechanism can buffer the expansion of the electrode assembly, and is beneficial to slowing down the increase of the expansion force.

According to the battery cell provided by some embodiments of the application, in the thickness direction of the pole piece, the projection of the pole piece is positioned in the projection range of the flexible layer, so that the flexible layer can well isolate the pole pieces on two sides in the thickness direction of the pole piece, and the expansion of the electrode assembly can be uniformly buffered by the flexible layer.

According to the battery cell provided by some embodiments of the application, the plurality of electrode assemblies are arranged, and the air guide mechanism is arranged between two adjacent electrode assemblies, so that the air guide mechanism can be arranged between the two adjacent electrode assemblies when the battery cell is assembled, the air guide mechanism can be conveniently arranged in the battery cell, and expansion of the electrode assemblies can be buffered.

According to the battery cell provided by some embodiments of the application, the electrode assembly is of a winding structure, and the air guide mechanism is arranged at the winding center of the electrode assembly, so that the air guide mechanism can be conveniently arranged in the battery cell and other components in the battery cell are not easy to influence.

In a second aspect, the application further provides a battery, which comprises the battery cell provided by any one of the above technical schemes.

In a third aspect, the present application further provides an electric device, where the electric device includes the battery provided by the above technical solution, and the battery is used for providing electric energy.

The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects:

Some embodiments of the application provide a battery cell, which includes a housing, an electrode assembly, and an air guide mechanism, wherein the housing includes a first wall and a second wall that are disposed opposite to each other, the first wall is provided with a pressure release mechanism, the electrode assembly is accommodated in the housing, the air guide mechanism is accommodated in the housing and is provided with an air guide channel, and the air guide channel is used for communicating a space between the electrode assembly and the pressure release mechanism with a space between the second wall and the electrode assembly. Through the structure, the space between the electrode assembly and the pressure release mechanism in the battery cell can be communicated with the space between the second wall and the electrode assembly, so that gas between the second wall and the electrode assembly can smoothly reach the position of the pressure release mechanism without accumulation, and the gas generated by thermal runaway in the battery cell can be smoothly discharged through the pressure release mechanism, thereby being beneficial to improving the reliability of the battery cell.

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

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present 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 an internal structure of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic diagram of an air guide mechanism according to some embodiments of the present application;

FIG. 5 is a schematic view of an air guide mechanism according to some embodiments of the present application with a second supporting layer removed;

FIG. 6 is a schematic view of an electrode assembly with an air guide mechanism according to some embodiments of the present application;

fig. 7 is a schematic view of another embodiment of an electrode assembly with a gas guide mechanism.

Reference numerals in the specific embodiments are as follows:

1. A vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a case; 51. a first case; 52. a second case; 53. an accommodation space; 6. a battery cell; 61. a housing; 611. a first wall; 612. a second wall; 62. an electrode assembly; 621. a main body portion; 6211. a first end face; 6212. a second end face; 622. a tab; 623. a pole piece; 63. an air guide mechanism; 631. an air duct; 6311. a first port; 6312. a second port; 632. a flexible layer; 6321. a first clamping layer; 6322. a second clamping layer; 7. and a pressure release mechanism.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

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. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

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.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

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: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

In embodiments of the present application, "parallel" includes not only the case of absolute parallelism, but also the case of substantially parallelism that is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering. Illustratively, the angle between the two directions is 85 ° -90 °, which can be considered to be perpendicular; the included angle between the two directions is 0-5 degrees, and the two directions can be considered to be parallel.

The term "plurality" as used herein refers to two or more (including two).

Currently, the more widely the battery is used in view of the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, as well as a plurality of fields such as military equipment, aerospace, and the like.

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.

The battery cell may be a secondary battery cell, and the secondary battery cell refers to a battery cell that can activate an active material by charging after discharging the battery cell and continue to use.

The battery cell can be lithium ion battery cell, sodium lithium ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium sulfur battery cell, magnesium ion battery cell, nickel-hydrogen battery cell, nickel-cadmium battery cell, lead storage battery cell, etc.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In some embodiments, the electrode assembly is a wound structure or a lamination stack. Alternatively, the electrode assembly is a cylindrical rolled structure.

In some embodiments, the battery cell may include a housing. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

As examples, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like.

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

In some embodiments, a pressure relief mechanism may also be provided on the housing of the battery cell for relieving the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold.

In the related art, under the condition that thermal runaway occurs in the battery monomer, the gas circulation inside the battery monomer is not smooth, and the internal pressure can't act on the relief mechanism in time, causes the risk that the relief mechanism can't actuate in time, and gaseous piling up leads to the battery monomer to break easily, has seriously influenced the reliability of battery monomer.

In order to improve reliability of a battery cell, an embodiment of the application provides a battery cell, which comprises a housing, an electrode assembly and an air guide mechanism, wherein the housing comprises a first wall and a second wall which are oppositely arranged, the first wall is provided with a pressure release mechanism, the electrode assembly is accommodated in the housing, the air guide mechanism is accommodated in the housing and is provided with an air guide channel, and the air guide channel is used for communicating a space between the electrode assembly and the pressure release mechanism with a space between the second wall and the electrode assembly. Because the space between the electrode assembly and the pressure release mechanism in the battery monomer can be communicated with the space between the second wall and the electrode assembly through the air guide mechanism, the air between the second wall and the electrode assembly can smoothly reach the position of the pressure release mechanism without accumulation, so that the air generated by thermal runaway in the battery monomer can be smoothly discharged through the pressure release mechanism, and the reliability of the battery monomer is improved.

The battery cell described in the embodiment of the application is suitable for a battery and an electric device using the battery.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or 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. The embodiment of the application does not limit the electric device in particular.

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

Fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.

As shown in fig. 1, the interior of the vehicle 1 is provided with a battery 2, and the battery 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being arranged to control the battery 2 to power the motor 4, for example for operating power requirements during start-up, navigation and driving of the vehicle 1.

In some embodiments of the application, the battery 2 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 an exploded view of a battery according to some embodiments of the present application. As shown in fig. 2, the battery 2 includes a case 5 and a battery cell 6 (not shown), and the battery cell 6 is accommodated in the case 5. Wherein the case 5 is used for providing an accommodation space for the battery cell 6. The number of the battery cells 6 in the battery 2 can be multiple, and the multiple battery cells 6 can be connected in series or parallel or in series-parallel, wherein the series-parallel refers to that the multiple battery cells 6 are connected in series or parallel. The plurality of battery cells 6 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 6 is accommodated in the box body 5; of course, the battery 2 may also be a battery module form formed by connecting a plurality of battery cells 6 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 5.

The case 5 may include a first case 51 and a second case 52, and the first case 51 and the second case 52 are covered with each other to define an accommodating space 53 for accommodating the battery cell 6. The first casing 51 and the second casing 52 may be various shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first case 51 may have a hollow structure with one side opened, and the second case 52 may have a hollow structure with one side opened, and the open side of the second case 52 is closed to the open side of the first case 51 to form the case 5 having the accommodation space 53.

As shown in fig. 3, some embodiments of the present application provide a battery cell 6, where the battery cell 6 includes a housing 61, an electrode assembly 62, and an air guide mechanism 63, the housing 61 includes a first wall 611 and a second wall 612 disposed opposite to each other, the first wall 611 is provided with a pressure release mechanism 7, the electrode assembly 62 is accommodated in the housing 61, the air guide mechanism 63 is accommodated in the housing 61 and is provided with an air guide channel for communicating a space between the electrode assembly 62 and the pressure release mechanism 7 with a space between the second wall 612 and the electrode assembly 62.

The case 61 may be a wall structure provided at the outer circumference of the battery cell 6, which can form a chamber for accommodating other components of the battery cell 6, such as the electrode assembly 62, and an electrolyte. The electrode assembly 62 is in contact with an electrolyte as a member accommodated in the case 61, and active ions (e.g., lithium ions) can be conducted between the electrode assembly 62 and the electrolyte. By accommodating the electrode assembly 62 in the case 61 such that the electrode assembly 62 can be protected by the case 61, it is advantageous to reduce the possibility that the electrode assembly 62 is bumped by the outside, and to improve the reliability of the electrode assembly 62.

The first wall 611 and the second wall 612 may be part of wall structures disposed opposite to each other in the case 61 with a gap between the electrode assembly 62 received in the case 61 and the first wall 611 and the second wall 612. Wherein the pressure relief mechanism 7 may be provided on the first wall 611.

The pressure release mechanism 7 may be a member provided on the housing 61 for releasing the internal pressure of the battery cell 6, which is capable of communicating the cavity inside the housing 61 with the outside, so that the pressure inside the battery cell 6 is released to the outside. Illustratively, the pressure relief mechanism 7 is located between the positive electrode terminal and the negative electrode terminal.

Illustratively, the pressure relief mechanism 7 may include components such as an explosion-proof valve, an explosion-proof piece, a gas valve, a pressure relief valve, or a safety valve, which may be provided at a through hole opened in the first wall 611 so that the cavity inside the housing 61 can communicate with the outside through such components. When the temperature and pressure inside the battery cell 6 exceeds a threshold value, the pressure release mechanism 7 will actuate and expel the gas or liquid inside the battery cell 6, reducing the risk of rupture or explosion of the battery cell 6.

The pressure release mechanism 7 may further include a weak structure on the first wall 611, when the pressure of the cavity inside the casing 61 reaches a threshold value, the weak structure is pushed open under the action of an impact force, so that the cavity inside the casing 61 is communicated with the outside, and the high-temperature gas can be released in time, so that the risk of cracking or explosion of the battery unit 6 is reduced.

The gas guide 63 may be a mechanism for guiding the gas in the space between the second wall 612 and the electrode assembly 62 to the space between the electrode assembly 62 and the pressure release mechanism 7. The gas guide channel may be a channel structure formed in the gas guide mechanism 63, and the gas guide channel enables the gas in the space between the second wall 612 and the electrode assembly 62 to smoothly enter the space between the electrode assembly 62 and the pressure release mechanism 7 by communicating the space between the electrode assembly 62 and the pressure release mechanism 7 with the space between the second wall 612 and the electrode assembly 62, so that the gas generated by thermal runaway in the battery cell 6 can smoothly be discharged through the pressure release mechanism 7, which is beneficial to improving the reliability of the battery cell 6.

In some embodiments, the gas guide 63 includes a gas guide tube 631 and a flexible layer 632, the gas guide tube 631 providing a gas guide channel, the flexible layer 632 encasing at least a portion of the gas guide tube 631 and separating the electrode assembly 62 from the gas guide tube 631.

The gas guide tube 631 may be a tube structure provided in the gas guide mechanism 63, which is provided with a gas guide passage for guiding the gas in the space between the second wall 612 and the electrode assembly 62 along the extending direction of the gas guide tube 631.

The flexible layer 632 may be a structural layer for coating at least a portion of the air duct 631, which reduces damage to the electrode assembly 62 due to direct contact of the air duct 631 with the electrode assembly 62 by coating the outer wall of the air duct 631 such that the air duct 631 is spaced apart from the electrode assembly 62.

In some embodiments, the elastic modulus of the airway tube 631 is greater than the elastic modulus of the flexible layer 632.

By setting the elastic modulus of the air duct 631 to be greater than the elastic modulus of the flexible layer 632, the flexible layer 632 is more easily compressed than the air duct 631, so that the flexible layer 632 can buffer the extrusion of the air duct 631, deformation of the air duct 631 is reduced, the air duct 63 is easy to deform when being extruded by the electrode assembly 62 and other components, the air duct 631 is difficult to deform, and the air duct 63 is reduced in air guide capacity caused by extrusion.

Illustratively, the elastic modulus of the air duct 631 is greater than the elastic modulus of the electrode assembly 62.

By setting the elastic modulus of the air duct 631 to be greater than the elastic modulus of the electrode assembly 62, the air duct 631 is not easily compressed compared with the electrode assembly 62, so that the air duct 631 in the air duct 63 is not easily deformed when the air duct 63 and the electrode assembly 62 are mutually pressed, which is beneficial to reducing the air duct capability reduction of the air duct 63 caused by the pressing.

In some embodiments, the air duct 631 may be made of polypropylene, polyethylene or metal, so that the air duct 631 is a hard tube, and has a large elastic modulus, and is not easy to deform. In some embodiments, the flexible layer 632 may be made of polyethylene terephthalate, polycarbonate, or polyvinyl chloride, such that the flexible layer 632 has excellent insulation and physical and mechanical properties.

Illustratively, the air duct 631 may be configured as a circular tube or a flat tube, and those skilled in the art may configure the type of the air duct 631 according to actual situations.

In some embodiments, the air guide tubes 631 in the air guide mechanism 63 may be provided with a plurality of air guide tubes 631 at intervals, so that the air guide mechanism 63 has a strong air guide capability, and the air in the space between the second wall 612 and the electrode assembly 62 can be smoothly introduced into the space between the electrode assembly 62 and the pressure release mechanism 7.

In some embodiments, as shown in fig. 4, the flexible layer 632 includes a first grip layer 6321 and a second grip layer 6322, with the airway 631 connected between the first grip layer 6321 and the second grip layer 6322.

The first grip layer 6321 and the second grip layer 6322 are two different structural layers in the flexible layer 632, respectively. By having the flexible layer 632 include two different structural layers, the air duct 631 can be enabled to achieve good separation between the air duct 631 and the electrode assembly 62 by being disposed between the first and second clamping layers 6321, 6322.

Illustratively, the air duct 631 may be connected between the first clamping layer 6321 and the second clamping layer 6322 by bonding or welding, so that the air duct 631 is firmly connected to the flexible layer 632, and the possibility of shaking the air duct 631 is reduced.

In some embodiments, as shown in fig. 5, the air duct 631 may be adhered to the first clamping layer 6321 to effect the securement of the air duct 631 in the flexible layer 632.

In some embodiments, as shown in fig. 6, electrode assembly 62 includes a plurality of stacked pole pieces 623 with gas directing mechanism 63 sandwiched between adjacent two pole pieces 623.

Electrode assembly 62 includes a plurality of pole pieces 623 arranged in a stacked configuration such that electrode assembly 62 is a laminated structure. By sandwiching the air guide 63 between two adjacent pole pieces 623 in the electrode assembly 62, the air guide 63 can buffer expansion of the electrode assembly 62, which is beneficial to slowing down the increase of expansion force.

Illustratively, in the thickness direction of the pole piece 623, the projection of the pole piece 623 is within the projection range of the flexible layer 632.

By setting the projection of the pole piece 623 in the thickness direction thereof within the projection range of the flexible layer 632 in the thickness direction of the pole piece 623, the flexible layer 632 can well isolate the pole pieces 623 on both sides in the thickness direction of the pole piece 623, so that the flexible layer 632 can uniformly buffer the expansion of the electrode assembly 62.

In some embodiments, as shown in fig. 7, the electrode assembly 62 is a wound structure, and the gas guide 63 is disposed at the winding center of the electrode assembly 62.

By arranging the air guide mechanism 63 in the winding center of the electrode assembly 62, the air guide mechanism 63 can be conveniently arranged in the battery cell 6, and other components in the battery cell 6 are not easy to influence.

In some embodiments, a plurality of electrode assemblies 62 are provided, and a gas guide 63 is provided between two adjacent electrode assemblies 62.

By providing a plurality of electrode assemblies 62 in the battery cell 6, the performance of the battery cell 6 can be improved. By disposing the gas guide 63 between the adjacent two electrode assemblies 62, not only can the gas guide 63 be installed between the adjacent two electrode assemblies 62 when the battery cells 6 are assembled, but also the gas guide 63 can be conveniently disposed in the battery cells 6 and can buffer the expansion of the electrode assemblies 62.

Illustratively, the gas guide 63 may be sandwiched between two adjacent electrode assemblies 62 and may also be disposed between two adjacent electrode assemblies 62 by being connected to at least one of the two adjacent electrode assemblies 62.

In some embodiments, the projection of the flat region of the electrode assembly 62 is within the projection range of the flexible layer 632 in the arrangement direction of the electrode assembly 62.

By setting the projection of the flat regions of the electrode assemblies 62 in the arrangement direction of the electrode assemblies 62 within the projection range of the flexible layer 632 in the spacing direction of the electrode assemblies 62, the flexible layer 632 can well isolate the electrode assemblies 62 on both sides in the spacing direction of the electrode assemblies 62, so that the flexible layer 632 can uniformly cushion the expansion of the electrode assemblies 62.

In some embodiments, the electrode assembly 62 includes a body portion 621 and a tab 622, the body portion 621 including a first end face 6211 facing the first wall 611 and a second end face 6212 facing the second wall 612, the tab 622 being connected to the body portion 621; the air duct 631 includes a first port 6311 and a second port 6312 along the self-extending direction, the first port 6311 is flush with the first end surface 6211 of the main body 621 or extends out of the first end surface 6211, and the second port 6312 is flush with the second end surface 6212 of the main body 621 or extends out of the second end surface 6212.

The body portion 621 may be a body structure in the electrode assembly 62, which includes a first end surface 6211 facing the first wall 611 and a second end surface 6212 facing the second wall 612, with a space capable of storing gas between the first end surface 6211 and the first wall 611, and a space capable of storing gas between the second end surface 6212 and the second wall 612. Tab 622 may be a member of electrode assembly 62 that is connected to main body 621 for electrically connecting pole piece 623 of main body 621 with other members of battery cell 6 for input or output of electrical energy.

The first port 6311 and the second port 6312 may be two ports of the gas-guide tube 631 in the self-extending direction, and by making the first port 6311 flush with the first end face 6211 of the main body portion 621 or protruding from the first end face 6211, making the second port 6312 flush with the second end face 6212 of the main body portion 621 or protruding from the second end face 6212, the gas-guide tube 631 can communicate the space between the electrode assembly 62 and the pressure relief mechanism 7 and the space between the second wall 612 and the electrode assembly 62 through the first port 6311 and the second port 6312, so that the gas in the space between the second wall 612 and the electrode assembly 62 can smoothly pass through the gas-guide tube 631 to the position of the pressure relief mechanism 7, facilitating its smooth relief.

In some embodiments, the housing 61 includes a shell and an end cap, which are separate components of the housing, and which are connected to one another to form the housing. The casing may be configured as a cylindrical structure with an opening, the end cover is sealed to the opening, and the end cover and the casing enclose a cavity inside the battery unit 6. The first wall 611 may be an end cover of the foregoing technical solution, the second wall 612 may be a housing of the foregoing technical solution, and the first wall 611 may be sealed and connected to the opening of the second wall 612 by welding.

Some embodiments of the present application further provide a battery 2, where the battery 2 includes a battery cell 6 provided in any of the above-mentioned embodiments.

Some embodiments of the present application further provide an electric device, where the electric device includes the battery 2 provided by any one of the above technical solutions, and the battery 2 is used to provide electric energy.

The powered device may be any of the aforementioned devices or systems employing the battery 2.

According to some embodiments of the present application, referring to fig. 3, the present application provides a battery cell 6, the battery cell 6 includes a case 61, an electrode assembly 62 and a gas guide mechanism 63, the electrode assembly 62 includes a main body portion 621 and a tab 622, a first end surface 6211 and a second end surface 6212 of the main body portion 621 face a first wall 611 and a second wall 612 of the case 61, respectively, and the gas guide mechanism 63 is sandwiched between two adjacent electrode assemblies 62. The gas-guide mechanism 63 comprises a gas-guide tube 631 and a flexible layer 632, the gas-guide tube 631 is connected between a first clamping layer 6321 and a second clamping layer 6322 of the flexible layer 632, a first port 6311 of the gas-guide tube 631 extends out of a first end face 6211 of the electrode assembly 62, and a second port 6312 is flush with a second end face 6212 of the electrode assembly 62, so that a gas-guide channel in the gas-guide tube 631 communicates a space between the electrode assembly 62 and the pressure relief mechanism 7 with a space between the second wall 612 and the electrode assembly 62.

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 (11)

1. A battery cell, comprising:

The shell comprises a first wall and a second wall which are oppositely arranged, and the first wall is provided with a pressure relief mechanism;

an electrode assembly accommodated in the case;

And the gas guide mechanism is accommodated in the shell and is provided with a gas guide channel, and the gas guide channel is used for communicating the space between the electrode assembly and the pressure release mechanism with the space between the second wall and the electrode assembly.

2. The battery cell of claim 1, wherein the gas guide mechanism comprises a gas guide tube provided with the gas guide channel and a flexible layer encasing at least a portion of the gas guide tube and separating the electrode assembly and the gas guide tube.

3. The battery cell of claim 2, wherein the electrode assembly comprises a body portion including a first end face facing the first wall and a second end face facing the second wall, and a tab connected to the body portion; the air duct comprises a first port and a second port along the self extending direction, wherein the first port is flush with the first end face or extends out of the first end face, and the second port is flush with the second end face or extends out of the second end face.

4. The battery cell of claim 2, wherein the airway tube has a modulus of elasticity that is greater than a modulus of elasticity of the flexible layer.

5. The battery cell of claim 2, wherein the flexible layer comprises a first grip layer and a second grip layer, the gas-guide tube being connected between the first grip layer and the second grip layer.

6. The battery cell of claim 2, wherein the electrode assembly comprises a plurality of stacked pole pieces, and the gas guide mechanism is sandwiched between two adjacent pole pieces.

7. The battery cell of claim 6, wherein a projection of the pole piece is within a projection range of the flexible layer in a thickness direction of the pole piece.

8. The battery cell according to claim 2, wherein a plurality of the electrode assemblies are provided, and the gas guide mechanism is disposed between two adjacent electrode assemblies.

9. The battery cell according to claim 1, wherein the electrode assembly is a winding structure, and the gas guide mechanism is disposed at a winding center of the electrode assembly.

10. A battery comprising a battery cell according to any one of claims 1 to 9.

11. An electrical device comprising a battery as claimed in claim 10, said battery being arranged to provide electrical energy.