CN221102326U - 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 a pressure relief piece, the shell forms an accommodating space, the shell is provided with a through hole, the accommodating space can be communicated with the outside through the through hole, the electrode assembly is arranged in the accommodating space, the pressure relief piece covers the through hole and is connected with the shell, the pressure relief piece comprises an extension part, and the projection of the extension part is positioned in the range of the through hole in the axial direction of the through hole. In the above structure, the pressure release piece covered on the through hole comprises the extension part, and the projection of the extension part on the axial direction of the through hole is positioned in the range of the through hole, so that the extension part can be subjected to extension deformation under the deformation state (such as the expansion of the battery cell) of the battery cell, the acting force born by the joint of the pressure release piece and the housing is relieved, the possibility of damage of the joint of the pressure release piece and the housing is reduced, and the reliability of the battery cell is improved.

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 battery application field, the reliability problem of the battery is increasingly receiving 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, wherein the battery cell has high reliability.

In a first aspect, some embodiments of the present application provide a battery cell including a case forming an accommodating space, an electrode assembly, and a pressure relief member, the case being provided with a through hole capable of communicating the accommodating space with the outside; the electrode assembly is disposed in the receiving space; the pressure release piece covers in the through-hole and is connected with the shell, and the pressure release piece includes extension, and in the axial of through-hole, the projection of extension is located the within range of through-hole.

In the above structure, the pressure release piece covered on the through hole comprises the extension part, and the projection of the extension part on the axial direction of the through hole is positioned in the range of the through hole, so that the extension part can be subjected to extension deformation under the deformation state (such as the expansion of the battery cell) of the battery cell, the acting force born by the joint of the pressure release piece and the housing is relieved, the possibility of damage of the joint of the pressure release piece and the housing is reduced, and the reliability of the battery cell is improved.

According to some embodiments of the present application, the pressure release member further includes a main body connected to the extension portion, and the extension portion is sleeved on the outer periphery of the main body and located between the main body and the wall of the through hole. Through setting up extension portion between the pore wall of main part and through-hole, not only make main part and extension portion all be located the through-hole in axial projection scope at the axial with the ascending projection of through-hole for the shell is under the state of exerting tensile to the pressure release piece, and extension portion can radially extend the deformation at the through-hole, and the buffering shell is to the tensile that the pressure release piece was exerted, thereby reduces the atress of pressure release piece and shell junction, reduces the impaired possibility of pressure release piece and shell junction.

According to the battery cell provided by some embodiments of the present application, the main body portion has the cracking structure configured to crack in a state that the pressure in the accommodating space exceeds the first threshold value to communicate the accommodating space with the outside, so that when the pressure in the accommodating space in the battery cell exceeds the first threshold value, the cracking structure of the main body portion can crack to communicate the accommodating space with the outside, thereby reducing the possibility that the pressure in the accommodating space continues to increase, being beneficial to reducing the possibility of explosion of the battery cell, and improving the reliability of the battery cell.

According to some embodiments of the present application, the main body includes a first region and a second region connected to each other, and the thickness of the first region is smaller than that of the second region in the axial direction of the through hole, and the first region forms a split structure. By setting the thickness of the first region to be smaller than the thickness of the second region, the structural strength of the first region is made smaller than that of the second region, so that the first region can be formed to be more easily broken than the second region, so that the body portion can be broken at the first region, so that the breaking position of the body portion can be controlled by a person skilled in the art.

According to the battery cell provided by some embodiments of the application, the extension part comprises the fold structure, so that the extension part can stretch when being acted by external tensile force, the pressure release piece can stretch and deform greatly, acting force applied to the joint of the pressure release piece and the shell is relieved, and the possibility of damage to the joint of the pressure release piece and the shell is reduced.

According to the battery cell provided by the embodiments of the application, the pressure release piece is welded on the wall surface of the shell facing the electrode assembly, so that the pressure release piece is positioned in the accommodating space of the electrode assembly, the pressure release piece is not easy to collide with an external device of the battery cell, and the possibility of damage to the pressure release piece is reduced.

According to the battery cell provided by some embodiments of the present application, the battery cell further includes a connection structure, wherein a projection of the connection structure passes through a range of the through hole in an axial direction of the through hole, and the connection structures located at both sides of the through hole are connected to the housing. When the shells on two sides of the passing direction of the connecting structure are far away from each other, the connecting structure can bear the mutual far away pulling force of the shells on two sides of the passing direction of the connecting structure, so that the pulling force of the shells on two sides of the passing direction of the connecting structure on the pressure release piece is reduced, acting force born by the joint of the pressure release piece and the shells is reduced, and the possibility of damage to the joint of the pressure release piece and the shells is reduced.

According to the battery cell provided by some embodiments of the application, the connection structure is arranged apart from the pressure release member. Through setting up connection structure and pressure release piece mutually for connection structure is not connected with the pressure release piece, makes connection structure be difficult for covering the first district of main part, has reduced connection structure's influence to the pressure release piece.

According to some embodiments of the application, the connecting structure is welded to a wall surface of the case facing away from the electrode assembly.

According to the battery cell provided by some embodiments of the application, the connection structure comprises a plurality of connection parts and a plurality of support parts, the support parts are connected between two adjacent connection parts, in the axial direction of the through hole, the projection of the connection parts passes through the range of the through hole, the projection of the support parts is positioned in the range of the through hole, and the connection parts positioned at two sides of the through hole are connected with the shell.

According to the battery cell provided by some embodiments of the application, the connecting structure is an integrally formed structure, so that the integral structure of the connecting structure has good strength.

In a second aspect, some embodiments of the present application provide a battery, which includes the battery cell provided in any one of the above-mentioned aspects.

In a third aspect, some embodiments of the present application provide an electric device, where the electric device includes a battery provided by the above technical solution, and the battery is used to provide electric energy.

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

Some embodiments of the present application provide a battery cell including a case forming an accommodating space, the case being provided with a through hole capable of communicating the accommodating space with the outside, an electrode assembly disposed in the accommodating space, and a pressure relief member covered on the through hole and connected to the case, the pressure relief member including an extension, a projection of the extension being located within a range of the through hole in an axial direction of the through hole. In the above structure, the pressure release piece covered on the through hole comprises the extension part, and the projection of the extension part on the axial direction of the through hole is positioned in the range of the through hole, so that the extension part can be subjected to extension deformation under the deformation state (such as the expansion of the battery cell) of the battery cell, the acting force born by the joint of the pressure release piece and the housing is relieved, the possibility of damage of the joint of the pressure release piece and the housing is reduced, and the reliability of the battery cell is improved.

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.

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

fig. 2 is a schematic structural diagram of a battery according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

fig. 4 is a schematic structural diagram of a battery cell according to another embodiment of the application;

fig. 5 is an enlarged view of a pressure relief member in a battery cell according to some embodiments of the present application;

FIG. 6 is a cross-sectional view at A-A in FIG. 5;

FIG. 7 is an enlarged view of a pressure relief member in a battery cell according to other embodiments of the present application;

fig. 8 is an enlarged view of a pressure relief member in a battery cell according to still other embodiments of the present application;

Fig. 9 is a cross-sectional view at B-B in fig. 7.

In the drawings:

1. An end cap; 2. a housing; 3. a through hole; 4. a pressure release member; 41. an extension; 411. a pleated structure; 42. a main body portion; 421. a first zone; 422. a second zone; 423. a cracking structure; 5. a connection structure; 51. a connection part; 52. a support part; 53. a reinforcing block; 10. a case; 101. a first case; 102. a second case; 20. a battery cell; 201. an electrode assembly; 202. a housing; 203. an accommodation space; 1000. a vehicle; 100. a battery; 200. a controller; 300. a motor.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

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.

Embodiments of the present application refer to a battery that includes one or more battery modules, which 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 casing is used for packaging the electrode assembly, electrolyte and other components. 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, where there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form a battery module, and the plurality of battery cells are connected in series, in parallel, or in series-parallel, where the series-parallel refers to both series connection and parallel connection of the plurality of battery cells.

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.

Since the internal pressure of the battery cell varies during the use of the battery. In the related art, a pressure release member is generally arranged on a housing of a battery cell to reduce pressure fluctuation inside the battery cell, so as to improve reliability of the battery cell and prolong service life of the battery cell. However, with the use of the battery monomer, the expansion of the battery monomer can be caused by the change of the internal pressure of the battery monomer, and the connection part of the pressure release piece and the shell can be subjected to the action force of pulling in the expanded state of the battery monomer, so that the possibility of deformation and even cracking exists, and the improvement of the reliability of the battery monomer is not facilitated.

In order to improve the reliability of a battery cell, some embodiments of the present application provide a battery cell including a case forming a receiving space, the case being provided with a through hole capable of communicating the receiving space with the outside, an electrode assembly disposed in the receiving space, and a pressure relief member covering the through hole and connected to the case, the pressure relief member including an extension portion having a projection in an axial direction of the through hole within a range of the through hole. In the structure, the pressure release piece covered on the through hole comprises the extension part, and the projection of the extension part on the axial direction of the through hole is positioned in the range of the through hole, so that the extension part can be extended and deformed under the deformation state of the battery shell, the acting force born by the joint of the pressure release piece and the shell is slowed down, the possibility that the joint of the pressure release piece and the shell is damaged is reduced, and the reliability of the battery shell 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 battery cell can be used for a battery, but not limited to, a vehicle, an airplane, a ship, an electronic device, an electric tool and other products, and the reliability of the products can be improved.

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.

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

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

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. Wherein the case 10 is used to provide an accommodation space for the battery cells 20. The number of the battery cells 20 in the battery 100 may be plural, and the plural battery cells 20 may be connected in series, parallel, or series-parallel, and series-parallel refers to that the plural battery cells 20 are connected in both series and parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10.

The case 10 may include a first case 101 and a second case 102, the first case 101 and the second case 102 being covered with each other to define a placement space for accommodating the battery cells 20. The first casing 101 and the second casing 102 may be various shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first case 101 may have a hollow structure with one side opened, and the second case 102 may have a hollow structure with one side opened, and the open side of the second case 102 is closed to the open side of the first case 101 to form the case 10 having a space for placement.

The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

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

In some embodiments of the present application, as shown in fig. 3, the battery cell 20 includes a case 202 and an electrode assembly 201, and the electrode assembly 201 is accommodated in the case 202. The case 202 may be a wall structure provided at the outer circumference of the battery cell 20, which can form a container for accommodating other components of the battery cell 20, such as the electrode assembly 201, and an electrolyte. The electrode assembly 201 is in contact with an electrolyte as a component contained in the case 202, and active ions (e.g., lithium ions) can be conducted between the electrode assembly 201 and the electrolyte.

The housing 202 includes an end cap 1 and a housing 2, wherein the housing 2 has an opening, and the end cap 1 covers the opening.

Some embodiments of the present application provide a battery cell 20, as shown in fig. 4, the battery cell 20 including a case 202, an electrode assembly 201, and a pressure relief member 4, the case 202 forming an accommodating space 203, the case 202 being provided with a through-hole 3, the through-hole 3 being capable of communicating the accommodating space 203 with the outside, the electrode assembly 201 being disposed in the accommodating space 203, the pressure relief member 4 covering the through-hole 3 and being connected to the case 202. With continued reference to fig. 5, the pressure relief piece 4 comprises an extension 41, the projection of which extension 41 is located within the extent of the through hole 3 in the axial direction of the through hole 3.

The casing 202 of the battery cell 20 according to the embodiment of the present application may include an end cap 1 and a case 2, which are hermetically connected to each other to together define an accommodating space 203 for accommodating components such as the electrode assembly 201. The case 2 may be illustratively a cylindrical structure having an opening at least one end, the cap 1 being sealed to the opening, the cap 1 and the case 2 together forming a receiving space 203 for receiving the electrode assembly 201, the electrolyte, etc.

The through hole 3 may be a hole structure formed on the end cover 1 or the housing 2, which can communicate the accommodating space 203 surrounded by the housing 202 with the outside, so that the through hole 3 can allow the gas in the accommodating space 203 to exchange with the outside, and the through hole 3 can be used as a channel for balancing the pressure in the accommodating space 203 with the outside pressure.

The electrode assembly 201 is immersed in the electrolyte by being disposed in the receiving space 203, and the electrode assembly 201 includes a positive electrode and a negative electrode. During charge and discharge of the battery cell 20, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode.

The pressure relief member 4 may be a member provided at the through hole 3 for controlling whether the through hole 3 communicates the accommodating space 203 with the outside. By covering the pressure release member 4 at the through hole 3 and sealing-connecting with the housing 202, the communication function of the through hole 3 is controlled by the pressure release member 4.

Illustratively, the pressure release member 4 may be a sheet member, so that the hydraulic member can be conveniently connected to the through hole 3 through a cover, so as to realize plugging of the through hole 3. The connection of the pressure release member 4 to the housing 202 may be such that the peripheral edge portion of the pressure release member 4 is sealingly connected to the housing 202 at the periphery of the through hole 3. Illustratively, the pressure relief member 4 may be adhered to the housing 202 by an adhesive substance such as glue, so that the pressure relief member 4 is conveniently connected to the housing 202; the pressure release piece 4 can also be welded to the housing 202, so that the connection between the pressure release piece 4 and the housing 202 has good connection strength and good tightness.

The extension 41 may be a portion of the pressure release member 4 that can be deformed by stretching, and may stretch when subjected to a tensile force. Illustratively, the extension 41 may be made of a material that is easy to deform, such as rubber, or a soft and ductile metal, such as copper or silver, for part of the structure of the pressure release member 4; the extension 41 may be formed by forming a structure such as a fold or a lamination in the pressure release material 4, and the structure such as the fold or the lamination may be stretched and deformed by a tensile force.

By arranging the projection of the extension part 41 in the axial direction of the through hole 3 in the range of the projection of the through hole 3 in the axial direction of the extension part, the extension part 41 is positioned on the inner side of the joint of the pressure relief part 4 and the shell 202, and the part of the pressure relief part 4 positioned on the inner side of the joint of the pressure relief part 4 and the shell 202 can be stretched and deformed, so that the pressure relief part 4 can be stretched and deformed under the state that the shell 202 is deformed or stressed to pull the pressure relief part 4, the acting force applied to the joint of the pressure relief part 4 and the shell 202 is relieved, and the possibility that the joint of the pressure relief part 4 and the shell 202 is damaged is reduced.

In some embodiments, the pressure relief member 4 further includes a main body portion 42 connected to the extension portion 41, and the extension portion 41 is sleeved on the outer periphery of the main body portion 42 and located between the main body portion 42 and the wall of the through hole 3.

The main body 42 may be a main body structure part in the pressure release member 4, and the extension 41 is connected to the main body 42, which together function to block the through hole 3.

The extension portion 41 may be fitted around the outer periphery of the main body portion 42, the extension portion 41 having a ring-shaped structure, and the main body portion 42 may be connected to the inner side of the extension portion 41 having the ring-shaped structure. Through setting up extension 41 between the pore wall of main part 42 and through-hole 3, not only make the projection of main part 42 and extension 41 in through-hole 3 axial direction all be located through-hole 3 axial direction's projection within range for shell 202 is in the state of exerting the pulling force to pressure release piece 4, and extension 41 can radially extend deformation at through-hole 3, and the pulling force that buffering shell 202 exerted pressure release piece 4 to the pressure release piece 4, thereby reduce the atress of pressure release piece 4 and shell 202 junction, reduce the possibility that pressure release piece 4 and shell 202 junction is impaired.

In some embodiments, the main body portion 42 has a cracking structure 423, the cracking structure 423 being configured to crack to communicate the accommodating space 203 with the outside in a state in which the pressure in the accommodating space 203 exceeds a first threshold.

The cleavage structure 423 may be a structure provided on the main body 42 for breaking the pressure release member 4 to communicate the accommodating space 203 with the outside. By configuring the cracking structure 423 to crack in a state in which the pressure in the accommodating space 203 exceeds the first threshold, the cracking structure 423 of the main body portion 42 can crack when the pressure in the accommodating space 203 in the battery cell 20 exceeds the first threshold, the accommodating space 203 is communicated with the outside, the possibility that the pressure in the accommodating space 203 continues to increase is reduced, the possibility that the battery cell 20 explodes is reduced, and the reliability of the battery cell 20 is improved.

Illustratively, the material strength of the material at the cracking structure 423 may be configured to be lower than the material strength of the material at other locations such that the body 42 may crack at the cracking structure 423 to communicate the accommodation space 203 with the outside; the thickness of the material of the cracking structure 423 may be lower than that of the material of other parts of the main body 42 by thinning the cracking structure 423, so that the structural strength of the cracking structure 423 is lower than that of the other parts of the main body 42, and when the pressure applied to the cracking structure 423 exceeds a first threshold value, cracking occurs.

In some embodiments, with continued reference to fig. 6, the body portion 42 includes a first region 421 and a second region 422 that are connected to each other, the first region 421 having a thickness that is less than the thickness of the second region 422 in the axial direction of the through hole 3, the first region 421 forming a split structure 423.

The first area 421 and the second area 422 may be different areas connected to each other in the main body 42, and may be adjacent two second areas 422 connected to each other through the first area 421. By setting the thickness of the first region 421 to be smaller than the thickness of the second region 422, the structural strength of the first region 421 is made smaller than that of the second region 422, so that the first region 421 can be formed to be more easily broken than the second region 422, so that the body portion 42 can be broken at the first region 421, so that the broken position of the body portion 42 can be controlled by those skilled in the art.

In some embodiments, extension 41 includes a pleat structure 411.

The pleated structure 411 may refer to a structure that undergoes wave bending without losing its continuity. By making the extension 41 include the fold structure 411, at least part of the fold structure 411 is laminated in the radial direction of the through hole 3, so that when the extension 41 is acted by external tensile force, the extension can stretch, so that the pressure release piece 4 is greatly stretched and deformed, the acting force applied to the connection part of the pressure release piece 4 and the housing 202 is relieved, and the possibility that the connection part of the pressure release piece 4 and the housing 202 is damaged is reduced.

The number of layers of the fold structure 411 can be set by a person skilled in the art according to the tensile force applied by the case 202 to the pressure release member 4, and if the expansion of the battery cell 20 makes the tensile force applied by the case 202 to the pressure release member 4 larger, the number of layers of the fold structure 411 can be increased; if the expansion of the battery cell 20 makes the tension applied by the case 202 to the pressure release member 4 smaller, the number of layers of the pleated structure 411 can be reduced.

In some embodiments, pressure relief piece 4 is welded to the wall of housing 202 that faces electrode assembly 201.

By welding the pressure release member 4 to the wall surface of the case 202 facing the electrode assembly 201, the pressure release member 4 is located in the accommodating space 203 of the electrode assembly 201, so that the pressure release member 4 is not easy to collide with devices outside the battery cell 20, which is beneficial to reducing the possibility of damage to the pressure release member 4.

In some embodiments, the pressure relief piece 4 may also be welded to the wall of the through hole 3, and the side of the pressure relief piece 4 facing the electrode assembly 201 is disposed flush with the side of the case 202 facing the electrode assembly 201.

Through welding pressure release piece 4 on the pore wall of through-hole 3 and with pressure release piece 4 towards the surface of electrode subassembly 201 with the surface parallel and level of shell 202 towards electrode subassembly 201 for the surface of pressure release piece 4 and the surface interval of shell 202 make pressure release piece 4 be difficult for receiving the bump of battery cell 20 external device equally, are favorable to reducing pressure release piece 4 impaired possibility.

In some embodiments, with continued reference to fig. 7 and 8, the battery cell 20 further includes a connection structure 5, and in the axial direction of the through-hole 3, the connection structure 5 projects through the range of the through-hole 3, and the connection structures 5 located at both sides of the through-hole 3 are connected to the housing 202.

The connection structure 5 may be a structure connected to the casing 202 around the pressure release member 4, which is used to reduce the pulling force of the casing 202 on the pressure release member 4 when the battery unit 20 expands, so as to slow down the acting force applied to the connection between the pressure release member 4 and the casing 202, and reduce the possibility of damage to the connection between the pressure release member 4 and the casing 202.

Through making the projection of connection structure 5 in the axial direction of through-hole 3 pass the scope of through-hole 3 for connection structure 5 can pass the scope that through-hole 3 corresponds from the outside of through-hole 3, make the both ends of connection structure 5 be located the through-hole 3 both sides respectively, and can connect respectively in the shell 202 of through-hole 3 in connection structure 5 pass the direction both sides, make this battery monomer 20 inflation expand, when the shell 202 of through-hole 3 in connection structure 5 pass the direction both sides keep away from each other, connection structure 5 can bear the shell 202 of through-hole 3 in connection structure 5 pass the direction both sides keep away from pulling force each other, thereby reduce the pulling force of through-hole 3 to pressure release 4 at connection structure 5 pass the shell 202 of direction both sides, be favorable to slowing down the effort that pressure release 4 and shell 202 junction received, be favorable to reducing pressure release 4 and shell 202 junction impaired possibility.

Illustratively, the connection structures 5 located at two sides of the through hole 3 are connected with the housing 202, and it may be that the connection structures 5 located at two sides of the through hole 3 are connected with the housing 202 by welding, so that the connection structures 5 are firmly connected with the housing 202, and the connection structures 5 can bear a larger tensile force of the housing 202.

Illustratively, the through hole 3 is formed in the end cover 1 of the housing 202, the pressure relief piece 4 covering the through hole 3 is welded to the housing 202, and the connection structure 5 may be welded to the end cover 1 of the housing 202 or may be welded to the shell 2 of the housing 202.

Illustratively, the through hole 3 is formed in the housing 2 of the casing 202, the pressure relief member 4 covering the through hole 3 is welded to the housing 2, and the connection structure 5 is welded to the housing 2 of the casing 202.

In some embodiments, with continued reference to fig. 9, a reinforcing block 53 may be disposed at the welding position of the connection structure 5 and the housing 202, and the reinforcing block 53 may be welded to the housing 202, so as to enhance the structural strength of the welding position of the connection structure 5 and the housing 202, so that the connection position of the connection structure 5 and the housing 202 may bear a larger force.

In some embodiments, the connection structure 5 is located separate from the pressure relief piece 4.

The connection structure 5 is disposed apart from the pressure relief member 4, which may mean that the connection structure 5 is disposed apart from the pressure relief member 4. Through setting up connection structure 5 and pressure release piece 4 mutually for connection structure 5 is not connected with pressure release piece 4, makes connection structure 5 be difficult for covering the first district 421 of main part 42, has reduced connection structure 5 to pressure release piece 4's influence.

In some embodiments, the connection structure 5 includes a plurality of connection portions 51 and support portions 52, the connection portions 51 are provided in plurality, the support portions 52 are connected between two adjacent connection portions 51, in the axial direction of the through hole 3, the projection of the connection portions 51 passes through the range of the through hole 3, the projection of the support portions 52 is located within the range of the through hole 3, and the connection portions 51 located at both sides of the through hole 3 are connected to the housing 202.

The connection portion 51 and the support portion 52 may be different structural parts of the connection structure 5, and are connected to each other to transmit the tensile force caused by the housing 202. Here, the connection portion 51 may be a portion of the connection structure 5 for connection with the housing 202, and the support portion 52 may be a portion of the connection structure 5 for connection with the connection portion 51, which is not directly connected with the housing 202.

Through setting up a plurality of connecting portions 51 to make the connecting portion 51 that is located the through-hole 3 both sides all connect in shell 202, make connection structure 5 have the many positions of being connected with shell 202, make connection structure 5 and shell 202's connection more firm, make connection structure 5 can connect in the shell 202 around pressure release piece 4 better, connection structure 5 can reduce the pulling force of shell 202 to pressure release piece 4 when this battery cell 20 expands better.

By connecting the support portion 52 between the two adjacent connection portions 51, not only can the support portion 52 connect the plurality of connection portions 51 to function as a whole, but also forces can be transmitted between the two adjacent connection portions 51, which is advantageous in making the stress of the connection structure 5 uniform throughout.

By passing the projection of the connection portion 51 in the axial direction of the through hole 3 through the range of the through hole 3, the connection portion 51 is enabled to traverse both sides of the through hole 3 and connect with the housings 202 on both sides of the through hole 3. By positioning the projection of the supporting portion 52 in the axial direction of the through hole 3 within the range of the through hole 3, the supporting portion 52 can enhance the strength of the portion of the connection structure 5 located within the range of the through hole 3, which is beneficial to improving the capability of the connection structure 5 to bear tensile force.

Illustratively, the plurality of connection portions 51 may be disposed in a cross shape or a cross shape, the support portion 52 is disposed in a ring shape, and the support portion 52 is disposed around the connection portion of the connection portion 51 and connected with the connection portion 51, so that the connection portion 51 and the support portion 52 are connected into an integral structure, and the connection structure 5 has better structural strength.

In some embodiments, the two adjacent connection portions 51 may be connected to the housing 202 after being intersected and connected at a predetermined angle near the end of the housing 202, and the supporting portion 52 is connected between the two adjacent connection portions 51 far from the housing 202 to form a triangle structure. The supporting parts 52 in the two triangular structures are connected with each other to form a connecting unit, and the connecting parts 51 thereon are respectively connected to the shells 202 on two opposite sides of the pressure release member 4, so that when the shells 202 on two opposite sides of the pressure release member 4 apply a tensile force to the connecting structure 5, the supporting parts 52 can resist the whole connecting structure 5 to be pulled by being pressed. Illustratively, a plurality of connection units are connected in sequence along the extension direction of the through-hole 3 to form a connection structure 5.

In some embodiments, the connection structure 5 is an integrally formed structure.

The connecting part 51 and the supporting part 52 can be manufactured by adopting an integrally formed processing method such as stamping, so that the connecting structure 5 can be manufactured integrally and synchronously, the processing and manufacturing of the connecting structure 5 are convenient, and the integral structure of the connecting structure 5 has good strength; the connecting portion 51 and the supporting portion 52 may be formed by machining a whole blank by a machining method such as milling.

Some embodiments of the present application further provide a battery 100, where the battery 100 includes the battery cell 20 provided by the above technical solution.

Some embodiments of the present application further provide an electric device, where the electric device includes the battery 100 provided by the above technical solution, and the battery 100 is used for providing electric energy.

Some embodiments of the present application provide a battery cell 20, where the battery cell 20 includes a housing 202, an electrode assembly 201, a pressure relief member 4, and a connection structure 5, the electrode assembly 201 is disposed in a receiving space 203 formed by the housing 202, the housing 202 is provided with a through hole 3 capable of communicating the receiving space 203 with the outside, the pressure relief member 4 covers the through hole 3 and is welded to the housing 202, the pressure relief member 4 includes an extension 41 formed with a fold structure 411, and a projection of the extension 41 is located within a range of the through hole 3 in an axial direction of the through hole 3. The pressure relief piece 4 further comprises a main body portion 42 connected to the extension portion 41, wherein the thickness of a first area 421 on the main body portion 42 is smaller than that of a second area 422, and the first area 421 forms a cracking structure 423. In the axial direction of the through hole 3, the projection of the connection structure 5 passes through the range of the through hole 3, and the connection structures 5 located on both sides of the through hole 3 are connected to the housing 202. In the above structure, since the pressure release member 4 covered on the through hole 3 includes the extension portion 41, and the projection of the extension portion 41 in the axial direction of the through hole 3 is located in the range of the through hole 3, the extension portion 41 can be extended and deformed in a deformed state (for example, the battery cell 20 is expanded) of the housing 202 of the battery cell 20, so that the acting force exerted on the connection portion of the pressure release member 4 and the housing 202 is relieved, the possibility of damage to the connection portion of the pressure release member 4 and the housing 202 is reduced, and the reliability of the battery cell 20 is improved.

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 (13)

1. A battery cell, comprising:

A housing forming an accommodation space, the housing being provided with a through hole capable of communicating the accommodation space with the outside;

An electrode assembly disposed in the receiving space;

And the pressure release piece covers the through hole and is connected with the shell, the pressure release piece comprises an extension part, and the projection of the extension part is positioned in the range of the through hole in the axial direction of the through hole.

2. The battery cell of claim 1, wherein the pressure relief member further comprises a body portion connected to an extension portion, the extension portion being disposed around the body portion and between the body portion and a wall of the through hole.

3. The battery cell of claim 2, wherein the body portion has a fracture structure configured to fracture to communicate the accommodation space with the outside in a state in which a pressure in the accommodation space exceeds a first threshold.

4. The battery cell as recited in claim 3, wherein the body portion includes a first region and a second region that are connected to each other, the first region having a thickness in an axial direction of the through-hole that is smaller than a thickness of the second region, the first region forming the cleavage structure.

5. The battery cell of claim 1, wherein the extension comprises a pleated structure.

6. The battery cell of claim 1, wherein the pressure relief member is welded to a wall of the housing that faces the electrode assembly.

7. The battery cell of claim 1, further comprising a connection structure, wherein a projection of the connection structure in an axial direction of the through-hole passes through a range of the through-hole, and the connection structures located at both sides of the through-hole are connected to the housing.

8. The battery cell of claim 7, wherein the connection structure is disposed apart from the pressure relief member.

9. The battery cell of claim 7, wherein the connecting structure is welded to a wall of the housing facing away from the electrode assembly.

10. The battery cell according to claim 7, wherein the connection structure includes a plurality of connection parts and a support part, the support part is connected between two adjacent connection parts, in an axial direction of the through hole, a projection of the connection part passes through a range of the through hole, a projection of the support part is located in a range of the through hole, and the connection parts located at both sides of the through hole are connected to the housing.

11. The battery cell of claim 7, wherein the connection structure is an integrally formed structure.

12. A battery comprising a battery cell according to any one of claims 1 to 11.

13. An electrical device comprising a battery as claimed in claim 12, said battery being arranged to provide electrical energy.