CN220544152U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application discloses a battery monomer, a battery and an electricity utilization device. The battery cell includes a housing, a venting plate, and a barrier. The shell comprises a wall part, and a pressure relief hole is formed in the wall part; the pressure release sheet covers the pressure release hole and is provided with a pressure bearing area for bearing the internal and external pressure of the shell; the blocking member is used to block the bearing zone in the direction of action of the pressure inside the housing and/or the pressure outside the housing on the bearing zone. By means of the mode, the blocking piece is used for blocking the pressure bearing area of the pressure release piece, the bulge or collapse phenomenon of the pressure bearing area of the pressure release piece caused by the internal and external pressure difference of the shell can be reduced, and therefore occupation of the pressure release piece to the battery level space is reduced.

Description

Battery monomer, battery and power consumption device

RELATED APPLICATIONS

The present application claims priority from international application number PCT/CN2022/114899 entitled "end cap assembly, battery cell, battery and consumer" filed on 8/25 of 2022.

Technical Field

The application relates to the field of batteries, in particular to a battery monomer, a battery and an electricity utilization device.

Background

Energy conservation and emission reduction are key to sustainable development, so that the adjustment of an energy structure is promoted, and the development and application of a battery technology are promoted. For example, some electrical devices are provided with a battery that discharges to power the electrical device, and when the battery is not storing energy enough, the battery may be charged to store more electrical energy.

The battery generally comprises one or more than two battery cells, and during the repeated charge and discharge cycles of the battery cells, the inside of the housing of the battery cells generates gas due to side reactions of electrochemical reaction, and as the content of the gas increases, the air pressure inside the housing also changes, which easily causes deformation of the housing of the battery cells and structural strength failure of the housing.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery and an electric device, which can reduce the deformation degree of the pressure release sheet on the basis of effectively releasing the internal pressure of the battery cell.

In a first aspect, the present application provides a battery cell. The battery cell includes a housing, a venting plate, and a barrier. The shell comprises a wall part, and a pressure relief hole is formed in the wall part; the pressure release sheet covers the pressure release hole and is provided with a pressure bearing area for bearing the internal and external pressure of the shell; the blocking member is used to block the bearing zone in the direction of action of the pressure inside the housing and/or the pressure outside the housing on the bearing zone.

In the technical scheme of the embodiment of the application, the blocking piece is utilized to block the pressure-bearing area of the pressure release piece, so that the deformation degree of the pressure release piece can be reduced, and the bulge or collapse phenomenon of the pressure-bearing area of the pressure release piece caused by the internal and external pressure difference of the shell is further reduced.

In some embodiments, the stiffness of the barrier is greater than the stiffness of the bearing zone. When the pressure-bearing area is pressed and deformed to act on the blocking piece, the blocking piece has enough strength to resist acting force, so that the deformation of the pressure relief piece is blocked.

In some embodiments, the barrier covers the geometric center of the bearing zone. The blocking effect of the blocking piece on the bulge or collapse degree of the pressure bearing area can be improved, and the deformation degree of the pressure release piece is further reduced.

In some embodiments, the barrier partially covers the bearing zone. The air permeability of the bearing area can be maintained on the basis of blocking the bulge or collapse of the bearing area, so that air flow exchange is realized, and pressure relief is carried out.

In some embodiments, the number of barriers is at least two, with at least two barriers being disposed alongside one another and/or intersecting one another. By providing two or more blocking members, the bulge/collapse of the pressure-bearing area can be blocked from more angle positions, the blocking effect of the blocking members on the bulge or collapse degree of the pressure-bearing area is improved, and the deformation degree of the pressure release sheet is further reduced.

In some embodiments, the barrier blocks the bearing zone in the direction of the effect of both the housing internal pressure and the housing external pressure on the bearing zone. The pressure release piece that can block to cause because of the inside pressure of shell is bloated, also can block the pressure release piece that the outside pressure of shell caused simultaneously and collapse, further reduces the deformation degree of pressure release piece.

In some embodiments, the barrier is located on one side of the bearing zone and is secured to the bearing zone. The blocking piece can block the bulge of the bearing area and the collapse of the bearing area, and the assembly mode can be simplified.

In some embodiments, the battery cell further includes a fixing member, the pressure release sheet is connected to the wall portion through the fixing member, and the blocking member is connected to the fixing member. The assembly mode can be simplified, and meanwhile, the structural strength of the fixing piece can be improved.

In some embodiments, the securing member is disposed around the venting sheet and defines a window region through which the bearing region is exposed and the blocking member is at least partially disposed within the window region. The blocking piece can play a blocking role, and meanwhile, the influence of the blocking piece on the pressure release effect of the pressure release piece is reduced, so that the problem of excessive bulge or depression of the pressure release piece can be relieved, and the pressure release effect is not reduced.

In some embodiments, the barrier divides the window region into at least two sub-window regions through which the bearing region is exposed. The blocking effect of the blocking piece on the bulge or collapse of the bearing area can be improved, and the pressure release effect is not reduced.

In some embodiments, the barrier is connected between the fixtures on opposite sides of the window area. The assembly mode can be simplified, better supporting effect is provided for the fixing piece simultaneously, and the structural strength of the fixing piece is improved.

In some embodiments, the window area has a length direction and a width direction, the dimension of the window area along the length direction is larger than the dimension along the width direction, and the blocking member is connected between the fixing members on two opposite sides of the window area along the width direction, so that the window area is divided into at least two sub-window areas. The manufacturing process of the blocking piece and the fixing piece can be simplified, meanwhile, the structural strength of the fixing piece can be improved, and the blocking effect on the swelling or collapse phenomenon of the pressure release piece can be improved.

In some embodiments, the fixing member includes a top wall portion and a side wall portion, the top wall portion is annular to form a window area, the side wall portion is cylindrical, the side wall portion is connected with the top wall portion, the pressure relief piece includes a membrane main body, the pressure bearing area is located on the membrane main body, the membrane main body is arranged in an area surrounded by the side wall portion, the top wall portion covers an edge of the membrane main body, the blocking member is connected with the top wall portion and located on the same side of the membrane main body as the top wall portion. In this way, the process of the fixing member is simplified, and the interference of the blocking member on the assembly of the pressure release sheet and the fixing member can be reduced by the blocking member and the top wall portion on the same side of the diaphragm body.

In some embodiments, the breathable film further includes a stiffening ring disposed around an edge of the diaphragm body and connected to the diaphragm body, the diaphragm body being clamped to the mount by the stiffening ring. The edge of the diaphragm main body is provided with the reinforcing ring, the fixing strength of the diaphragm main body and the fixing piece can be improved by utilizing the clamping connection of the reinforcing ring and the fixing piece, and the damage probability of the fixing position of the pressure release piece and the fixing piece is reduced.

In some embodiments, the battery cell further includes a sealing ring embedded in the reinforcing ring, abutting against the overlapping region of the membrane body and the top wall portion, and disposed between the wall portion and the membrane body. The sealing property between the diaphragm main body and the fixing member can be improved while reducing the probability of the electrolyte inside the casing flowing out from the inside of the casing.

In some embodiments, the bearing zone is scored. When the pressure in the shell exceeds the pressure threshold, the notch can become a stress concentration point and break first, so that the pressure sensitivity of the bearing area is improved.

In some embodiments, the score is a semi-closed curve with an opening, and the projection of the barrier in a direction perpendicular to the body of the membrane falls at least partially into the opening. By the arrangement, the blocking piece corresponds to the non-nicked area as much as possible, and the influence of the blocking piece on the nicked explosion-proof effect is reduced.

In some embodiments, the outer surface of the wall is provided with a recessed region, the pressure relief hole communicates with the pressure relief hole and the interior of the housing, and the barrier and the pressure relief piece are received in the recessed region. The blocking piece and the pressure release piece are accommodated in the concave area, so that the protruding height of the blocking piece and the pressure release piece relative to the wall part can be reduced, and the occupation of the blocking piece and the pressure release piece to the battery level space is further reduced.

In some embodiments, the venting sheet is a breathable film, and the breathable film is a polymeric material. The gas in the battery monomer can be stably discharged, external moisture can be blocked from penetrating into the battery monomer when the battery monomer is normally used, water vapor and electrolyte are blocked from flowing into the battery monomer through the breathable film, and the short circuit risk of the battery monomer is reduced.

In some embodiments, the housing includes a cover and a shell, the cover closing the opening of the shell, the wall being the cover. The processing difficulty of the concave area can be reduced.

In a second aspect, the present application provides a battery comprising the aforementioned battery cell.

In a third aspect, the present application provides an electrical device comprising the aforementioned battery.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

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 accompanying drawings. In the drawings:

FIG. 1 is a schematic structural view of a vehicle according to one or more embodiments;

FIG. 2 is an exploded view of a battery according to one or more embodiments;

FIG. 3 is an exploded schematic view of a battery cell according to one or more embodiments;

fig. 4 is an exploded schematic view of a partial structure of a battery cell according to one or more embodiments;

fig. 5 is an exploded schematic view of a partial structure of a battery cell according to one or more embodiments;

fig. 6 is an assembled structural schematic diagram of a partial structure of a battery cell according to one or more embodiments;

fig. 7 is a top view of a partial structure of a battery cell according to one or more embodiments;

fig. 8 is a top view of a partial structure of a battery cell according to one or more embodiments;

fig. 9 is a cross-sectional view of a partial structure of a battery cell according to one or more embodiments.

In the accompanying drawings:

1000. a vehicle; 300. a motor; 200. a controller; 100. a battery; 10. a case; 11. a first portion; 12. a second portion; 20. a battery cell; 21. a cover; 21a, electrode terminals; 22. a housing; 23. an electrode assembly;

110. a wall portion; 101. a pressure release tablet; 1011. a diaphragm body; 1012. a reinforcing ring; 102. a fixing member; 10211. a top wall portion; 10212. a side wall portion; 106. a blocking member; j1, a first stop rib; j2, second stop ribs; 103. a seal ring; w1, a window area; w11, a first sub-window area; w12, a second sub-window area; w2, bearing area; w3, a concave region; K. scoring; h1, a pressure relief hole; o, geometric center.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present 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 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 and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two), unless otherwise specifically defined.

Reference herein 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 present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element 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.

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 the specific circumstances.

Currently, the application of power batteries is more widespread from the development of market situation. The power 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, and a plurality of fields such as military equipment, aerospace, and the like.

The application provides an electric device. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like. The power utilization device can comprise a battery, and the power utilization device can provide electric energy through the battery so as to realize the corresponding function of the power utilization device.

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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

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.

In order to improve the performance of the electrical device, the present application also provides a battery, see fig. 2, fig. 2 being an exploded view of a battery according to one or more embodiments. The shape of the battery includes, but is not limited to, square, and in other embodiments, the shape of the battery 100 may also be cylindrical, square, or any other shape.

In some embodiments, the battery 100 of the present application includes a case 10 and a battery cell 20, the battery cell 20 being housed within the case 10. The case 10 is used to provide an accommodating space for the battery cells 20, and the case 10 may take various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 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 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.

The manufacturing method of the battery 100 includes lamination type and winding type, that is, the battery 100 is divided into two types of lamination type and winding type. The laminated battery has uniform current collecting effect, smaller internal resistance and high specific power, but has extremely high requirement on die precision, high equipment investment, complex process and low production efficiency. The coiled battery is simple to manufacture, the requirements of the flaking and assembling processes on equipment precision are common, the production efficiency is high, and the cost is low. In terms of performance, the coiled battery has excellent high-low temperature performance, is very rapid to charge, has an ultra-long service life, is stable in high output voltage, and is firm in structure and strong in shock resistance.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell according to one or more embodiments. The battery cell 20 refers to the smallest unit constituting the battery 100. The battery cell 20 includes a housing, an electrode assembly 23, and other functional components. The housing includes a cover 21 and a case 22, the cover 21 closing an opening of the case 22.

The cover 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cover 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the cover 21 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the cover 21 is not easily deformed when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved. The material of the cover 21 may also be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The cover 21 may be provided with functional components such as electrode terminals 21 a. The electrode terminal 21a may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. In some embodiments, the electrode terminals 21a may include a positive electrode terminal and a negative electrode terminal for output of current and connection with an external circuit. In some embodiments, the cover 21 may further be provided with a pressure release sheet for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. In some embodiments, insulation may also be provided on the inside of the cover 21, which may be used to isolate electrical connection components within the housing 22 from the cover 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case 22 is an assembly for cooperating with the cover 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 23, the electrolyte, and other components. The case 22 and the cover 21 may be separate members, and an opening may be provided in the case 22, and the internal environment of the battery cell 20 may be formed by closing the cover 21 at the opening. It is also possible to integrate the cover 21 and the housing 22, but specifically, the cover 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the cover 21 is then put into contact with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be a variety of materials including, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the electrode assembly 23, and the portions of the positive and negative electrode sheets having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery cell, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal 21a to form a current loop.

As the number of charge and discharge cycles of the battery cell increases, the gas generated in the interior of the case of the battery cell due to the electrochemical side reaction increases gradually, thereby causing a change in the pressure in the interior of the case. The change in air pressure inside the casing easily causes deformation of the casing of the battery cell and structural strength failure of the casing. In order to reduce the influence of the increase of the gas in the battery cell on the shell, a venting sheet is designed on the shell of the battery cell in the related art, and the venting sheet can allow the gas to pass through, so that the gas in the battery cell can be discharged to the outside of the battery cell when the gas in the battery cell is increased, and the air pressure in the battery cell is reduced. However, this solution has problems, such as the pressure release sheet will bulge outwards when exposed to the internal air pressure, and the bulge will be higher than the battery allows.

Based on the above consideration, in order to solve the technical problem existing in the battery monomer in the prior art, the application provides a battery monomer, and the battery monomer can reduce the occurrence of the bulge or collapse phenomenon of the pressure bearing area of the pressure release sheet caused by the internal and external pressure difference of the shell on the basis of effectively releasing the internal pressure of the battery monomer, so that the occupation of the pressure release sheet to the battery level space is reduced.

Referring to fig. 4 to 6, fig. 4 is an exploded view of a battery cell partial structure according to one or more embodiments, fig. 5 is an exploded view of a battery cell partial structure according to one or more embodiments, and fig. 6 is an assembled structure view of a battery cell partial structure according to one or more embodiments.

According to some embodiments of the present application, the battery cell includes a housing, a pressure relief tab 101, and a barrier 106. The housing includes a wall portion 110, and a pressure release hole H1 is provided in the wall portion 110. The relief piece 101 covers the relief hole H1, and the relief piece 101 is provided with a pressure-bearing area W2 for bearing the pressure inside and outside the casing. The blocking member 106 serves to block the bearing area W2 in the direction in which the pressure inside the casing and/or the pressure outside the casing acts on the bearing area W2.

In the present embodiment, the battery cell includes a housing including the wall portion 110, and the wall portion 110 may be the cover 21 described above, and may be a part of the case 22.

In this embodiment, the pressure relief hole H1 is disposed on the wall portion 110, which can be understood as a through hole penetrating through the wall portion 110, so that the gas inside the housing can communicate with the external environment of the housing through the pressure relief hole H1. Alternatively, the shape of the pressure relief hole H1 includes, but is not limited to, a circular hole, a triangular hole, a square hole, and the like.

The relief piece 101 covers the relief hole H1 so that gas inside the case can act on the relief piece 101 through the relief hole H1. The pressure release sheet 101 is provided with a pressure receiving area W2 for receiving the pressure inside and outside the case. The pressure-bearing area W2 of the pressure release sheet 101 has a slow ventilation function, can timely discharge gas generated in the battery cell casing to reduce or maintain the air pressure in the battery cell, and the pressure-bearing area W2 of the pressure release sheet 101 can also block the electrolyte in the battery cell from passing through so as to prevent the electrolyte from leaking. In the present embodiment, the pressure-bearing area W2 covers the pressure relief hole H1 along the orthographic projection of the wall portion 110 in the thickness direction D1. The pressure-bearing region W2 has a tendency to bulge/collapse in the first direction by the gas pressure inside/outside the cell casing.

The blocking member 106 serves to block the bearing area W2 in the direction in which the pressure inside the casing and/or the pressure outside the casing acts on the bearing area W2. When the pressure inside the casing is excessively large, the pressure-bearing area W2 is pressed with a tendency to bulge toward the outside of the casing. When the pressure outside the casing is too great, the pressure-bearing area W2 tends to collapse toward the inside of the casing. The provision of the blocking member 106 can reduce the degree of swelling/collapsing of the bearing area W2.

In the technical scheme of the embodiment of the application, the blocking piece is utilized to block the pressure bearing area of the pressure relief piece, so that the bulge or collapse phenomenon of the pressure bearing area caused by the internal and external pressure difference of the shell can be reduced, particularly, the bulge of the pressure bearing area is reduced, the occupation of the pressure relief piece to the battery level space can be reduced, and the collapse of the pressure bearing area is reduced, so that the interference of the pressure relief piece to the internal element (such as an electrode assembly) of the battery can be reduced.

According to some embodiments of the present application, the stiffness of the barrier 106 is greater than the stiffness of the bearing zone W2. The blocking piece can provide certain supporting strength for the pressure bearing area, so that the blocking piece has enough strength to resist acting force when the pressure bearing area is subjected to pressure deformation to act on the blocking piece, and the blocking of the pressure release piece is realized.

According to some embodiments of the present application, the pressure release sheet 101 is a breathable film, and the breathable film has a function of slow ventilation, so that the gas generated inside the battery cell can be timely discharged to reduce or maintain the air pressure inside the battery cell, so as to have better safety performance. The breathable film has the breathable liquid resistance, namely, can allow gas to pass through, but not allow liquid to pass through, and can block electrolyte leakage while breathable and pressure-releasing. The breathable film may be a polymer film such as fluorinated ethylene propylene copolymer (FEP) or Polychlorotrifluoroethylene (PCTFE). The breathable film has certain flexibility and toughness, can have certain stretching and swelling properties when being pressurized by the air inside/outside the battery cell shell, and is not easy to burst. That is, the pressure release sheet 101 may be made of a relatively flexible polymer material. In other embodiments, pressure relief sheet 101 may also be a metal sheet, such as an aluminum sheet, nickel sheet, steel sheet, or the like.

The blocking member 106 may be made of a material having relatively high strength. The material of the barrier 106 includes, but is not limited to, aluminum, iron, copper, etc.; of course, the blocking member 106 may be made of a non-metal material such as a polymer material, and when the blocking member 106 is made of a polymer material, the blocking member 106 is made of a polymer material with high hardness, and the pressure release sheet is made of a polymer material with high flexibility.

According to some embodiments of the present application, the barrier 106 covers the geometric center of the bearing zone W2. The geometric center may be understood as the most central position of the bearing area W2, and the bearing area W2 may be a shape having a certain symmetry, and the geometric center thereof is the symmetry center. For example, the bearing area W2 is circular, the geometric center is the center of a circle, and for example, the bearing area W2 is elliptical, and the geometric center is the center of symmetry of the ellipse. The geometric center of the barrier 106 covering the bearing zone W2 is understood to be the geometric center of the bearing zone W2 covered by the orthographic projection of the barrier 106 onto the bearing zone W2. As shown in fig. 5, in the present embodiment, the orthographic projection of the blocking member 106 in the thickness direction D1 of the wall portion 110 covers the bearing area W2. The center point O of the bearing zone W2 shown in the figure is the geometric center of the bearing zone W2.

When the bearing zone W2 is subjected to pressure from the inside of the casing and/or the outside of the casing, the pressure is more likely to gather toward the central region of the bearing zone W2, so that the geometric central region is more likely to be deformed away from its position in the natural state with respect to the other positions on the bearing zone W2, and so that the height of the bulge/collapse is higher. Covering the blocking member 106 on the geometric center of the pressure-bearing area W2 can preferentially block the geometric center area, reducing the degree of bulge or collapse of the pressure relief piece 101. Further, the blocking piece acts on the geometric center of the bearing area, can provide balanced blocking force for the bearing area, symmetrically acts on different positions of the bearing area, so that the deformation degree of the bearing area is more uniform, the local position is blocked, and the phenomenon that the symmetrical position has larger bulge degree occurs.

According to some embodiments of the present application, the barrier 106 partially covers the bearing zone W2. The air permeability of the bearing area can be maintained on the basis of blocking the bulge/collapse of the bearing area, so that air flow exchange is realized, and the explosion-proof pressure relief effect is not reduced.

According to some embodiments of the present application, the blocking member 106 blocks the bearing zone W2 in the direction of action of both the housing internal pressure and the housing external pressure on the bearing zone W2.

The stoppers 106 may be provided on the side of the pressure-receiving area W2 facing the outside of the housing and the side of the pressure-receiving area W2 facing the inside of the housing, respectively. Blocking the degree of bulge of the pressure-bearing area W2 toward the outside of the casing by the blocking member 106 located at the side of the pressure-bearing area W2 toward the outside of the casing; the degree of collapse of the bearing area W2 toward the inside of the housing is blocked by the blocking member 106 toward the side of the inside of the housing. To enable a blocking effect in both directions.

In other embodiments, the stopper 106 may be incorporated in the pressure release sheet 101. For example, when the pressure release sheet 101 is a breathable film, a rib may be wrapped in the breathable film as the barrier 106. The strength of ventilated membrane can be improved to the setting of strengthening rib, blocks the deformation degree of ventilated membrane simultaneously. Because the blocking piece is arranged inside the pressure release piece, the performance of the pressure release piece is improved, and the acting force in the two-side direction of the film layer can be dealt with. In this case, the two sides of the pressure release sheet can be free of additional independent blocking pieces, and blocking of the swelling/collapsing degree of the pressure release sheet can be achieved.

According to some embodiments of the present application, the blocking member 106 is located at one side of the bearing area W2 and is fixed to the bearing area W2. That is, the blocking member 106 may be fixedly connected to the pressure relief sheet 101, including but not limited to, adhesive, snap fit, etc. The blocking member 106 is located at a side of the pressure-bearing area W2 facing the outside of the casing, and the blocking member 106 is connected to a side of the pressure release sheet 101 facing the outside of the casing. The blocking member 106 is located at a side of the pressure-bearing area W2 facing the inside of the casing, and the blocking member 106 is connected to a side of the pressure release sheet 101 facing the inside of the casing. Through blocking piece and pressure release piece fixed connection for blocking piece can pull the deformation that limits the pressure release piece, realizes blocking to the inflation/collapse degree of pressure release piece. For example, the blocking member 106 is located at a side of the pressure bearing area W2 facing the outside of the casing and is fixedly connected to the pressure release sheet 101, and when the pressure release sheet 101 is inflated by the pressure inside the casing, the blocking member 106 can block the inflation degree; when pressure relief piece 101 collapses under the pressure external to the housing, because pressure relief piece 101 is secured to barrier 106, barrier 106 is able to pull on pressure relief piece 101, reducing the degree of collapse.

According to some embodiments of the present application, the battery cell further includes a fixing member 102, the venting sheet 101 is connected to the wall portion 110 through the fixing member 102, and the blocking member 106 is connected to the fixing member 102.

The blocking member 106 may be connected to the fixing member 102, then the pressure release sheet 101 may be connected to the fixing member 102 with the blocking member 106, and then the fixing member 102 may be fixedly connected to the wall portion 110, where the fixing connection manner includes, but is not limited to, bonding, welding, clamping, and the like. In some embodiments, the relief piece 101 may be provided with a clamping protrusion, and the fixing piece 102 may be provided with a clamping groove at a position corresponding to the relief piece 101, and the relief piece 101 and the fixing piece 102 may be connected by using the clamping protrusion and the clamping groove. Through utilizing the mounting to be fixed in the wall with the pressure release piece on, the while is blocked the piece and is also set up on the mounting, can simplify the assembly fixed mode of pressure release piece and wall, improves the stability of fixing simultaneously.

According to some embodiments of the present application, the fixing member 102 is disposed around the venting sheet 101 and surrounds the window area W1, the bearing area W2 is exposed through the window area W1, and the blocking member 106 is at least partially located in the window area W1.

The fixing member 102 may be an annular plate with a hole in the center, and the material of the annular plate may be metal, including but not limited to aluminum, iron, copper, or non-metal materials such as organic polymers, and the material of the fixing member 102 may be selected by those skilled in the art according to the product and process requirements.

When the pressure release sheet 101 is connected with the fixing piece 102, the pressure bearing area W2 corresponds to the window area W1 so as to expose the pressure bearing area W2, so that shielding coverage of the fixing piece 102 on the pressure bearing area W2 is reduced, and further, the influence of the blocking piece on the explosion-proof effect of the pressure bearing area is reduced. Meanwhile, the blocking member 106 is at least partially located within the window area W1 so that the blocking member 106 can block the bearing area W2 in the acting direction of the pressure inside the casing and/or the pressure outside the casing to the bearing area W2. Through the mode, the blocking piece can play a blocking role, the influence of the blocking piece on pressure relief of the pressure relief piece is reduced, the problem of excessive bulge or sinking of the pressure relief piece can be relieved, and the pressure relief effect is not reduced.

According to some embodiments of the present application, barrier 106 divides window area W1 into at least two sub-window areas, the number of sub-windows including, but not limited to, two, three, four, five, eight, ten, etc. Taking two sub-window areas as an example, the window area W1 includes a first sub-window area W11 and a second sub-window area W12. The bearing area W2 is exposed through at least two sub-window areas, so that the blocking effect of the blocking piece on the bulge or collapse of the bearing area can be improved, and the explosion-proof effect is not reduced. As the air pressure inside or outside the housing increases, the pressure bearing zone W2 bulges or collapses through the sub-window. The first and second sub-window areas W11 and W12 are capable of providing a passage for pressure relief of the side of the pressure bearing area W2 facing away from the barrier 106 when the pressure of the side of the pressure bearing area W2 facing away from the barrier 106 is greater than a predetermined pressure threshold such that the pressure bearing area W2 bulges or collapses. Therefore, the blocking area plays a role in blocking, the influence of the blocking piece on pressure relief of the pressure relief piece is reduced, and the problem of excessive bulge or sinking of the pressure relief piece is relieved.

According to some embodiments of the present application, the barrier 106 is connected between the fixtures 102 on opposite sides of the window area W1. That is, the blocking member 106 spans between the fixing members 102 on opposite sides of the window area W1. The assembly mode can be simplified, and simultaneously the blocking piece can provide supporting and fixing effects for the fixing piece, so that the structural strength of the fixing piece is improved.

According to some embodiments of the present application, the window area W1 has a length direction D2 and a width direction D3, the dimension of the window area W1 along the length direction D2 is greater than the dimension along the width direction D3, and the blocking member 106 is connected between the fixing members 102 on two opposite sides of the window area W1 along the width direction, so as to divide the window area W1 into at least two sub-window areas.

The blocking member 106 is disposed in a strip shape and is bridged between the fixing members 102 on two opposite sides of the window area W1 along the width direction D3, and the window area W1 is divided into a first sub-window area W11 and a second sub-window area W12 along the length direction D2. This embodiment can simplify the process of the stopper 106 and the fixing member 102. This stopper 106 sets up along window area W1's width direction, can reduce the length of stopper 106, and when release piece 101 bloated and exert pressure to stopper 106, be favorable to reducing the arm of force of stopper 106, improves the holistic structural strength of stopper 106 and mounting 102, promotes the blocking effect of stopper 106 to release piece 101. Of course, in other embodiments, the blocking member 106 may also be bridged between the fixing members 102 on two opposite sides of the window area W1 along the length direction D2, in other embodiments, the blocking member 106 may also be bridged between the fixing members 102 on two opposite sides of the window area W1 along other directions forming a certain included angle with the length direction D2 and the width direction D3, and those skilled in the art may choose the direction of the blocking member 106 according to practical needs.

Referring to fig. 7 and 8, fig. 7 is a top view of a partial structure of a battery cell according to one or more embodiments in accordance with some embodiments of the present application; fig. 8 is a top view of a partial structure of a battery cell according to one or more embodiments. The number of stops 106 is at least two, including but not limited to two, three, four, five, ten, etc. The number of the stoppers 106 can be appropriately set according to the size of the bearing zone W2 by those skilled in the art.

At least two stops 106 are disposed side-by-side and/or intersecting each other, with the shape between the two stops 106 including, but not limited to, a bar, "a cross," an X, "etc. In other embodiments, the barrier 106 includes, but is not limited to, annular, wavy, polygonal, etc., and the shape and size of the barrier 106 may be designed as desired by those skilled in the art. The shape of the barrier 106 includes, but is not limited to, elongated, mesh, and the like.

Referring to fig. 7, taking two bar-shaped blocking members 106 disposed side by side as an example, the two blocking members 106 are disposed side by side and cover opposite sides of the bearing area W2, and the center of the blocking member 106 is not covered at the geometric center of the bearing area W2. It is possible that two side-by-side barriers 106 are symmetrically arranged with respect to the geometric center of the bearing area W2. When the bearing zone W2 bulges or collapses, the two stoppers 106 limit the degree of bulge or collapse of the geometric center of the bearing zone W2 by stopping the bulge or collapse of the opposite sides of the bearing zone W2.

Referring to fig. 8, taking a cross shape as an example, the center of the cross-shaped blocking member 106 may cover the geometric center of the bearing area W2, and the blocking member 106 extends with the geometric center to partially cover the bearing area W2 in different directions. When the bearing area W2 bulges or collapses, the cross-shaped blocking member 106 blocks the geometric center of the bearing area W2 from bulging or collapsing while limiting the degree of bulging or collapsing of other areas bearing.

In this way, providing two or more blocking members can block the bulge/collapse of the bearing area from more angular positions while improving the structural strength of the blocking members. At least two barriers are arranged side by side and/or intersecting each other, which simplifies the manufacturing process of the barriers while providing a blocking effect.

As an example, referring to fig. 8, the blocking member 106 includes a first blocking rib J1 and a second blocking rib J2 intersecting each other, the first blocking rib J1 and the second blocking rib J2 may be vertically disposed, such that the blocking member 106 is disposed in a cross shape, the window area W1 has a length direction D2 and a width direction D3, the first blocking rib J1 may extend in the length direction D2, and the second blocking rib J2 may extend in the width direction D3. The first stop rib J1 and the second stop rib J2 may be at an angle other than 90 degrees to each other. By the method, the manufacturing process of the fixing piece can be simplified, meanwhile, the structural strength of the fixing piece is improved, and the stopping effect on the pressure release piece is improved.

According to some embodiments of the present application, the fixing member 102 includes a top wall portion 10211 and a side wall portion 10212, the top wall portion 10211 is disposed in a ring shape to form a window area W1, the side wall portion 10212 is disposed in a cylinder shape, the side wall portion 10212 is connected with the top wall portion 10211, the pressure release sheet 101 includes a diaphragm body 1011, the pressure bearing area W2 is located on the diaphragm body 1011, the diaphragm body 1011 is disposed in an area surrounded by the side wall portion 10212, the top wall portion 10211 covers an edge of the diaphragm body 1011, and the blocking member 106 is connected with the top wall portion 10211 and is located on the same side of the top wall portion 10211 as the diaphragm body 1011.

The side wall 10212 can be used to fix the edge of the diaphragm body 1011, and the pressure-bearing area W2 of the diaphragm body 1011 is generally located in the middle area of the diaphragm body 1011, and the side wall 10212 is used to fix the edge of the diaphragm body 1011 to the fixing member 102, so that the integrity of the pressure-bearing area W2 is maintained. The top wall 10211 covers the diaphragm main body 1011 along the edge of the diaphragm main body 1011, so that when the diaphragm main body 1011 bulges toward the fixing member 102 side, the top wall 10211 plays a role in blocking the edge of the diaphragm main body 1011, thereby reducing the probability of detachment of the pressure release sheet 101 from the fixing member 102 and improving the fixing strength of the pressure release sheet 101 and the fixing member 102. The connection of the stopper 106 to the top wall 10211 is advantageous in simplifying the process of the fixing member 102, and the stopper 106 and the top wall 10211 are located on the same side of the diaphragm body 1011 to reduce the interference of the stopper 106 to the assembly of the pressure release sheet 101 and the fixing member 102. By the method, the blocking piece is connected with the top wall part, so that the manufacturing process of the fixing piece is simplified, and interference of the blocking piece on the assembly of the pressure release piece and the fixing piece can be reduced on the same side of the diaphragm main body.

According to some embodiments of the present application, the pressure relief piece 101 further includes a reinforcing ring 1012, wherein the reinforcing ring 1012 is disposed around an edge of the diaphragm body 1011 and is connected to the diaphragm body 1011, and the diaphragm body 1011 is clamped with the fixing member 102 by the reinforcing ring 1012.

The reinforcing ring 1012 can be integrally formed with the diaphragm main body 1011, and in the direction D1 perpendicular to the diaphragm main body 1011, the thickness of the reinforcing ring 1012 is greater than the thickness of the diaphragm main body 1011, and by increasing the thickness, the strength of the reinforcing ring 1012 area can be improved, thereby improving the fixing strength of the diaphragm main body 1011 and the fixing member 102, and reducing the probability of breakage of the fixing portion of the pressure release sheet 101 and the fixing member 102.

In another embodiment, the stiffener ring 1012 is snapped into engagement with the mount 102. The reinforcing ring 1012 may be provided with a snap protrusion and the fixing member 102 may be provided with a snap groove. The buckling bulge and the clamping groove are buckled to form a fixation. The fastening bulges on the reinforcing ring penetrate through the clamping grooves and are connected with the fixing piece. Specifically, the inner wall surface of the outer wall surface side wall portion 10212 of the reinforcing ring 1012 is bonded to the outer wall surface of the top wall portion 10211, and the sealing performance of the fixing member is advantageously improved.

In other embodiments, the pressure relief piece 101 may not be provided with the reinforcing ring 1012, and the diaphragm body 1011 may be directly fixed to the fixing member 102. Pressure relief tab 101 may be injection molded with mount 102. Holes penetrating through the fixing piece 102 are formed in the fixing piece 102, then a pressure release sheet material is injected, a pressure bearing area is formed in a window area of the fixing piece 102 by the pressure release sheet material, meanwhile, a connecting structure with the fixing piece 102 is formed in a wall area of the fixing piece 102, specifically, the pressure release sheet material is injected into the holes of the fixing piece to form a clamping structure, and fixed connection is achieved. By the method, the reinforcing ring is arranged at the edge of the diaphragm main body, so that the fixing strength of the diaphragm main body and the fixing piece can be improved, and the damage probability of the fixing position of the pressure release piece and the fixing piece is reduced. According to some embodiments of the present application, the battery cell further includes a sealing ring 103, where the sealing ring 103 is embedded in the reinforcing ring 1012, abuts against the overlapping area of the membrane main body 1011 and the top wall 10211, and is disposed between the wall 110 and the membrane main body 1011.

The material of the seal ring 103 includes, but is not limited to, a polymer elastomer and the like. The overlapping area of the sealing ring 103 abutting the diaphragm body 1011 and the top wall portion 10211 may be understood as the orthographic projection of the sealing ring 103 on the top wall portion 10211 overlapping the overlapping area of the top wall portion 10211 and the diaphragm body 1011. The seal ring 103 is embedded in the reinforcing ring 1012, so that the seal ring 103 and the pressure release sheet 101 can be assembled conveniently, the seal ring 103 can improve the tightness between the wall portion 110 and the diaphragm main body 1011, and meanwhile, the probability that electrolyte inside the casing flows out from the inside of the casing is reduced.

By the method, the sealing ring is abutted against the overlapping area of the diaphragm main body and the top wall part, so that the sealing performance between the diaphragm main body and the fixing piece can be improved, and meanwhile, the probability that electrolyte in the shell flows out from the shell can be reduced.

According to some embodiments of the present application, the barrier 106 may also be directly connected to the edge of the pressure relief sheet 101 without passing through the fasteners; it is also possible that the blocking member 106 is directly connected to the wall portion 110 without passing through the fixing member.

In accordance with some embodiments of the present application, there is a score K in the bearing zone W2. The notch K is a non-through groove provided in the pressure-bearing area W2, and may be formed by press forming, milling forming, or the like. The shape of the score K includes, but is not limited to, annular, arcuate, U-shaped, linear, and H-shaped grooves, etc.

When the pressure inside or outside the shell exceeds the pressure threshold, the notch K can become a stress concentration point and break preferentially relative to other parts of the bearing area W2 to form an opening for gas discharge, which is beneficial to improving the pressure sensitivity of the bearing area W2. The tearing strength of the notch K can be directionally regulated and controlled by a person skilled in the art through the depth, the length, the width and the like of the notch K, so that the pressure relief requirements of different products are met.

By the method, the notch can serve as a stress concentration point and is preferentially broken relative to other parts of the bearing area to form an opening for gas discharge, so that the pressure sensitivity of the bearing area is improved.

According to some embodiments of the present application, score K is a semi-closed curve having an opening H, and the projection of barrier 106 in a direction D1 perpendicular to film body 1011 falls at least partially within opening H. The blocking piece corresponds to the non-nicked area as much as possible, and the influence of the blocking piece on the nicked explosion-proof effect is reduced.

By the method, the probability of complete falling of the area surrounded by the scores can be reduced, fragments generated by the rupture of the diaphragm main body can be reduced, and the damage of the rupture of the diaphragm main body to the electrode assembly and the circuit in the shell can be reduced.

Referring to fig. 9, fig. 9 is a cross-sectional view of a partial structure of a battery cell according to one or more embodiments. According to some embodiments of the present application, the outer surface of the wall portion 110 is provided with a recessed area W3, and the pressure relief hole H1 communicates with the pressure relief hole H1 and the inside of the housing, and the blocking member 106 and the pressure relief piece 101 are accommodated in the recessed area W3. The side of the wall portion 110 facing the inside of the housing is recessed to form a recessed area W3.

The wall portion 110 includes a wall portion main body 1101, the wall portion main body 1101 includes a first main surface a1 and a second main surface a2 disposed opposite to each other, the second main surface a2 is disposed toward the interior of the housing, and a recess area W3 concavely disposed with respect to the first main surface a1 and a pressure relief hole H1 communicating the interior of the housing with the recess area W3 are disposed on the wall portion 110.

In particular, the wall body 1101 may be provided in a plate shape including, but not limited to, a square plate shape, a kidney-shaped plate shape, an oval plate shape. For different battery cells, wall bodies 1101 of different shapes may be provided. The major surface may be defined as the surface of the wall body 1101 that is the largest in area. In the present embodiment, the wall portion 110 may be the cover 21 described above, and may be a part of the housing 22.

In this embodiment, the pressure relief hole H1 is disposed at the bottom of the recessed area W3, and in other embodiments, the pressure relief hole H1 may be disposed at another position, so that the gas inside the casing may be only required to be communicated with the external environment of the battery cell through the pressure relief hole H1 and the recessed area W3. The stopper 106 and the pressure release sheet 101 are accommodated in the recessed area W3, and an orthographic projection of the stopper 106 and the pressure release sheet 101 in the thickness direction D1 of the wall portion 110 covers the pressure release hole H1.

Through the mode, the pressure release hole is covered by the pressure release sheet, and the gas in the battery cell shell can be continuously discharged through the ventilation characteristic of the pressure release sheet, so that pressure release is effectively realized. Further, the pressure release piece sets up in the depressed area at least partially, can reduce the protruding height of pressure release piece for the first main surface of wall portion main part, and then reduces the occupation of pressure release piece to battery level space.

In summary, the present application provides a battery cell, a battery and an electric device. The battery cell includes a housing, a pressure relief tab 101, and a barrier 106. The shell comprises a wall part 110, and a pressure relief hole H1 is formed in the wall part 110; the pressure release sheet 101 covers the pressure release hole H1, and the pressure release sheet 101 is provided with a pressure bearing area W2 for bearing the internal and external pressure of the shell; the blocking member 106 serves to block the bearing area W2 in the direction in which the pressure inside the casing and/or the pressure outside the casing acts on the bearing area W2. In the technical scheme of the embodiment of the application, the blocking piece is utilized to block the pressure-bearing area of the pressure release sheet, so that the bulge or collapse phenomenon of the pressure-bearing area of the pressure release sheet caused by the internal and external pressure difference of the shell can be reduced, and the service life of the pressure release sheet is prolonged.

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 present application has been described in detail with reference to the foregoing embodiments, it should 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 embodiments, and are intended to be included within the scope of the 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 (22)

1. A battery cell, the battery cell comprising:

the shell comprises a wall part, and a pressure relief hole is formed in the wall part;

the pressure release sheet covers the pressure release hole and is provided with a pressure bearing area for bearing the internal and external pressure of the shell;

and the blocking piece is used for blocking the bearing area in the acting direction of the pressure inside the shell and/or the pressure outside the shell on the bearing area.

2. The battery cell of claim 1, wherein the barrier has a stiffness greater than the stiffness of the compression zone.

3. The battery cell of claim 1, wherein the barrier covers a geometric center of the pressure-bearing region.

4. The battery cell of claim 1, wherein the barrier partially covers the pressure bearing region.

5. The battery cell according to claim 1, wherein the number of the blocking members is at least two, and at least two of the blocking members are arranged side by side and/or intersect each other.

6. The battery cell of claim 1, wherein the blocking member blocks the pressure-bearing region in a direction in which the pressure inside the case and the pressure outside the case act on the pressure-bearing region at the same time.

7. The battery cell of claim 1, wherein the barrier is located on one side of the compression zone and is secured to the compression zone.

8. The battery cell of any one of claims 1-7, further comprising a securing member, wherein the pressure relief tab is coupled to the wall portion via the securing member, and wherein the blocking member is coupled to the securing member.

9. The battery cell of claim 8, wherein the securing member is disposed around the pressure relief tab and defines a window region through which the pressure bearing region is exposed, and wherein the blocking member is at least partially disposed within the window region.

10. The battery cell of claim 9, wherein the barrier divides the window region into at least two sub-window regions through which the bearing region is exposed.

11. The battery cell of claim 9, wherein the barrier member is coupled between the securing members on opposite sides of the window region.

12. The battery cell of claim 10, wherein the window region has a length direction and a width direction, the window region has a greater dimension along the length direction than along the width direction, and the blocking member is coupled between the fixing members on opposite sides of the window region along the width direction, thereby dividing the window region into at least two of the sub-window regions.

13. The battery cell as recited in claim 9, wherein the securing member includes a top wall portion and a side wall portion, the top wall portion is disposed in an annular shape to form the window area, the side wall portion is disposed in a cylindrical shape, the side wall portion is connected with the top wall portion, the pressure relief sheet includes a membrane body, the pressure bearing area is located on the membrane body, the membrane body is disposed in an area surrounded by the side wall portion, the top wall portion covers an edge of the membrane body, and the blocking member is connected with the top wall portion and is located on a same side of the membrane body as the top wall portion.

14. The battery cell of claim 13, wherein the pressure relief tab further comprises a stiffening ring disposed around an edge of the diaphragm body, the diaphragm body being snap-fit to the mount via the stiffening ring.

15. The battery cell of claim 14, further comprising a sealing ring embedded within the stiffener ring and abutting the overlapping region of the membrane body and the top wall portion and disposed between the wall portion and the membrane body.

16. The cell defined in claim 1, wherein the pressure bearing region is scored.

17. The battery cell of claim 16, wherein the score is a semi-closed curve having an opening, and wherein a projection of the barrier in a direction perpendicular to the bearing region falls at least partially within the opening.

18. The battery cell of claim 1, wherein the outer surface of the wall portion is provided with a recessed region, the pressure relief hole communicates with the pressure relief hole and the interior of the housing, and the barrier and the pressure relief piece are received in the recessed region.

19. The battery cell according to claim 1, wherein the pressure release sheet is a gas permeable film, and the gas permeable film is a polymer material.

20. The battery cell of claim 1, wherein the housing comprises a cover and a shell, the cover closing an opening of the shell, the wall being the cover.

21. A battery comprising a cell according to any one of claims 1-20.

22. An electrical device comprising the battery of claim 21.