CN221407463U

CN221407463U - Battery monomer, end cover assembly, battery and power utilization device

Info

Publication number: CN221407463U
Application number: CN202420816559.0U
Authority: CN
Inventors: 白璐璐; 李星; 许虎; 郭小永; 陈龙; 陈相融
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-04-19
Filing date: 2024-04-19
Publication date: 2024-07-23
Anticipated expiration: 2034-04-19

Abstract

The application provides a battery monomer, an end cover assembly, a battery and an electric device. The battery monomer includes shell and relief mechanism, and the shell includes wall portion, and relief mechanism sets up in wall portion. The wall part comprises a wall main body and a reinforcing part, the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall part, the concave part is sunken relative to the other side of the wall main body along the thickness direction, the position of the convex part corresponds to the position of the concave part, and the convex part is convexly arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction. According to the application, the structural stability of the position area of the pressure release mechanism can be effectively improved, so that the reliability of the battery cell is improved.

Description

Battery monomer, end cover assembly, battery and power utilization device

Technical Field

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

Background

With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.

Be provided with the relief mechanism that is used for releasing internal pressure when the free internal pressure of battery reaches the threshold value on the battery, the structural stability in the position region of relief mechanism place has direct influence to the normal work of relief mechanism. Therefore, how to improve the structural stability of the location area of the pressure relief mechanism is a problem to be solved in the battery technology.

Disclosure of utility model

In view of the above problems, the application provides a battery cell, an end cover assembly, a battery and an electric device, which can effectively improve the structural stability of a position area where a pressure release mechanism is located, thereby improving the reliability of the battery cell.

In a first aspect, an embodiment of the present application provides a battery unit, where the battery unit includes a housing and a pressure relief mechanism, the housing includes a wall portion, and the pressure relief mechanism is disposed on the wall portion. The wall part comprises a wall main body and a reinforcing part, the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall part, the concave part is sunken relative to the other side of the wall main body along the thickness direction, the position of the convex part corresponds to the position of the concave part, and the convex part is convexly arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction.

Above-mentioned technical scheme's reinforcing part is located around the relief mechanism, and reinforcing part can improve the structural strength of relief mechanism place region to reduce the deformation of relief mechanism place region under the effect of the inside gas pressure of battery monomer, and then can reduce the risk that relief mechanism was unusual to open, improve the structural stability of relief mechanism place region effectively, thereby improve the reliability of battery monomer.

The convex part is convexly arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction, so that the resistance effect of the convex part to the acting force applied by the gas in the battery cell can be further improved, and the structural stability of the position area where the pressure release mechanism is located can be further improved. The concave part is sunken towards the outside one side of battery monomer along thickness direction for the wall main part for the concave part can hold the battery monomer and annotate the electrolyte of liquid in-process splash, reduces electrolyte and pollutes the release mechanism and lead to the risk of release mechanism corrosion damage, thereby is favorable to improving battery monomer's reliability.

In some embodiments of the first aspect, the battery cell further includes a first insulating member disposed on a side of the wall portion facing the inside of the battery cell in the thickness direction. The first insulating member includes a relief space, and at least a portion of the projection is accommodated in the relief space.

By arranging the first insulating piece, the wall part can be insulated and isolated from other electric connection parts in the battery unit, so that the risk of short circuit caused by contact between the wall part and the other electric connection parts in the battery unit is reduced. Through setting up dodge the space dodge the convex part, can reduce the convex part and take place to interfere and influence the risk of the insulating effect of first insulating piece with first insulating piece. Thereby facilitating further improvement of the reliability of the battery cell.

In some embodiments of the first aspect, the reinforcement is annular and disposed around the pressure relief mechanism.

Annular reinforcing part encircles the relief mechanism setting, and reinforcing part can absorb the stress of relief mechanism circumference upper difference position to can further improve the structural stability of relief mechanism place region.

In some embodiments of the first aspect, the reinforcement is a plurality of reinforcements, the plurality of reinforcements being spaced apart along the circumference of the pressure relief mechanism.

Through setting up a plurality of reinforcements along relief mechanism's circumference interval, can reduce material consumption when strengthening the structural strength of relief mechanism place region, reduction in production cost.

In some embodiments of the first aspect, the plurality of reinforcing portions includes a first reinforcing portion and a second reinforcing portion, the first reinforcing portion is disposed on at least one side of the pressure relief mechanism in the first direction and extends along the first direction, and the second reinforcing portion is disposed on at least one side of the pressure relief mechanism in the second direction and extends along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other.

Through the cooperation of first enhancement portion and second enhancement portion for a plurality of enhancement portions are radial distribution around relief mechanism, can further improve the structural strength of relief mechanism place region.

In some embodiments of the first aspect, the reinforcement is an integrally formed structure with the wall body.

On the one hand, the reinforcing part and the wall main body are not required to be connected through an additional connecting process, so that the manufacturing process flow is simplified. Meanwhile, compared with the mode that the reinforcing part is connected with the wall main body through an additional connecting process, the reinforcing part and the wall main body which are in an integrated structure have higher connection firmness.

In some embodiments of the first aspect, a first dimension h1 of the convex portion in the thickness direction protruding from the wall body and a second dimension d1 of the convex portion in the width direction thereof satisfy the relationship: h1/d1 is more than or equal to 1/20 and less than or equal to 2/3, and the width direction is perpendicular to the thickness direction.

The technical proposal can effectively improve the structural performance of the convex part by setting the height-width ratio of the convex part in the range.

In some embodiments of the first aspect, the first dimension h1 and the second dimension d1 satisfy the relationship: h1/d1 is more than or equal to 1/5 and less than or equal to 1/2. The structural performance of the convex portion itself can be further improved.

In some embodiments of the first aspect, the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.3mm and less than or equal to 3mm.

According to the technical scheme, the first dimension h1 is set in the range, so that the structural strength of the position area where the pressure release mechanism is located can be improved, and the energy density of the battery monomer can be optimized.

In some embodiments of the first aspect, the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.5mm and less than or equal to 1.5mm. The balance between the structural strength of the position area where the pressure release mechanism is located and the energy density of the battery cell can be further optimized.

In some embodiments of the first aspect, in the thickness direction, the minimum spacing t between the top end of the protrusion and the bottom end of the recess and the thickness f of the wall body satisfy the relationship: t/f is more than or equal to 0.5 and less than or equal to 2.

According to the technical scheme, the ratio of the minimum distance t between the top end of the convex part and the bottom end of the concave part to the thickness f of the wall main body is set in the range, so that the structural strength of the position area where the pressure release mechanism is located can be improved, and meanwhile, the energy density of the battery cell can be optimized.

In some embodiments of the first aspect, the minimum spacing t and the thickness f satisfy the relationship: t/f is more than or equal to 0.8 and less than or equal to 1.2. The balance between the structural strength of the position area where the pressure release mechanism is located and the energy density of the battery cell can be further optimized.

In some embodiments of the first aspect, the shortest distance L between the reinforcement and the edge of the pressure relief mechanism satisfies the relationship: l is more than 0 and less than or equal to 5mm.

According to the technical scheme, the shortest distance L between the reinforcing part and the edge of the pressure relief mechanism is set in the range, so that the reinforcing effect of the reinforcing part on the structural strength of the position area where the pressure relief mechanism is located can be improved.

In some embodiments of the first aspect, the shortest distance L satisfies the relationship: l is more than or equal to 1.5mm and less than or equal to 2.5mm. The reinforcing effect of the reinforcing part on the structural strength of the position area where the pressure relief mechanism is located can be further improved.

In some embodiments of the first aspect, the battery cell further includes a second insulating member disposed on a side of the wall portion facing the outside of the battery cell in the thickness direction. The second insulating member includes a relief opening penetrating the second insulating member in a thickness direction, and a projection of the recess in the thickness direction is located in a projection of the relief opening in the thickness direction.

By providing the second insulating member, the wall portion can be insulated from other electrical connection members outside the battery cell, and the risk of short-circuiting due to contact between the wall portion and other electrical connection members outside the battery cell is reduced. Through setting up dodging the mouth in order to dodge the concave part, can reduce the electrolyte function influence to concave part hold battery monomer splash in annotating the liquid in-process.

In some embodiments of the first aspect, the housing includes a shell having an opening and an end cap for covering the opening, the end cap being configured as a wall.

In a second aspect, the present application provides an end cap assembly comprising an end cap and a pressure relief mechanism disposed on the end cap. The end cover comprises a wall main body and a reinforcing part, the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall main body, the concave part is sunken relative to the other side of the wall main body along the thickness direction, the position of the convex part corresponds to the position of the concave part, and the convex part is convexly arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction.

The concave part is sunken towards the outside one side of battery monomer along thickness direction for the wall main part for the concave part can hold the battery monomer and annotate the electrolyte of liquid in-process splash, reduces electrolyte and pollutes the release mechanism and lead to the risk of release mechanism corrosion damage, thereby is favorable to improving battery monomer's reliability.

In some embodiments of the second aspect, the end cap assembly further comprises a first insulating member disposed on a side of the end cap facing the interior of the battery cell in a thickness direction. The first insulating member includes a relief space into which at least a portion of the projection extends.

Through setting up first insulating part, can be with the insulating isolation of the inside other electric connection parts of end cover and battery monomer, reduce the risk that the end cover contacts with the inside other electric connection parts of battery monomer and takes place the short circuit. Through setting up dodge the space dodge the convex part, can reduce the convex part and take place to interfere and influence the risk of the insulating effect of first insulating piece with first insulating piece. Thereby facilitating further improvement of the reliability of the battery cell.

In a third aspect, the present application provides a battery comprising the battery cell provided by any one of the embodiments of the first aspect.

In a fourth aspect, the present application provides an electrical device, which includes a battery cell provided in any embodiment of the first aspect, where the battery cell is used to provide electrical energy.

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

Drawings

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

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

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

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

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

fig. 5 is a schematic view illustrating an exploded structure of a battery cell according to some embodiments of the present application;

fig. 6 is a schematic structural diagram of a wall portion of a battery cell according to some embodiments of the present application;

FIG. 7 is a schematic cross-sectional view of FIG. 6 along A-A;

FIG. 8 is a schematic view of a partial enlarged structure at F of FIG. 7;

fig. 9 is a schematic perspective view of another battery cell according to some embodiments of the present application;

Fig. 10 is a schematic view illustrating an exploded structure of another battery cell according to some embodiments of the present application;

fig. 11 is a schematic structural view of a wall portion of another battery cell according to some embodiments of the present application;

FIG. 12 is a schematic cross-sectional view of FIG. 10 along B-B;

Fig. 13 is a partially enlarged schematic structural view of H of fig. 12.

Reference numerals in the specific embodiments are as follows:

1. A vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a case; 5a, a first box body part; 5b, a second box body part; 5c, an accommodating space; 6. a battery module; 7. a battery cell;

10. A housing; 10a, a shell; 10b, end caps; 11. a wall portion; 111. a wall body; 112. a reinforcing part; 112a, a first reinforcement; 112b, a second reinforcing portion; 1121. a convex portion; 1122. a concave portion; 20. a pressure release mechanism; 30. a first insulating member; 31. an avoidance space; 40. a second insulating member; 41. an avoidance port; 50. an electrode assembly;

X, thickness direction; y, first direction; z, the second direction.

Detailed Description

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

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

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

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

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

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

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

The term "parallel" in the present application includes not only the case of absolute parallelism but also the case of substantially parallelism as is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering.

In the embodiment of the application, the battery cell can be a secondary battery cell, and the secondary battery cell refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., which is not limited by the embodiment of the application.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. 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.

In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode, which may function to prevent the positive electrode and the negative electrode from being shorted, while allowing the active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

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

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

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

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

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

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

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

Be provided with the relief mechanism that is used for releasing internal pressure when the free internal pressure of battery reaches the threshold value on the battery, the structural stability in the position region of relief mechanism place has direct influence to the normal work of relief mechanism.

In the normal working process of the battery monomer, gas can be generated in the battery monomer, the gas can exert certain pressure on the shell of the battery monomer, so that the battery monomer can generate certain expansion, and the position area of the pressure release mechanism is easy to generate certain deformation under the action of the gas pressure, so that the pressure release mechanism is easy to be opened abnormally, and the normal use of the battery monomer is influenced.

Based on the above consideration, the embodiment of the application provides a battery unit, which comprises a shell and a pressure release mechanism, wherein the shell comprises a wall part, and the pressure release mechanism is arranged on the wall part. The wall part comprises a wall main body and a reinforcing part, the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall main body, the concave part is sunken relative to the other side of the wall main body along the thickness direction, and the position of the convex part corresponds to the position of the concave part.

The strengthening portion can improve the structural strength of the position area of the pressure release mechanism, so that the deformation of the position area of the pressure release mechanism under the action of the gas pressure in the battery cell is reduced, the abnormal opening risk of the pressure release mechanism is reduced, the structural stability of the position area of the pressure release mechanism is effectively improved, and the reliability of the battery cell is improved.

The technical scheme described by the embodiment of the application is suitable for the battery and the power utilization device using the battery.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described batteries and electric devices, but may be applied to all batteries including battery cases and electric devices using the batteries, but for simplicity of description, the following embodiments are described by taking electric vehicles as examples.

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

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

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

In some embodiments of the application, the battery 2 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is a schematic diagram illustrating an explosion structure of a battery according to some embodiments of the present application.

With continued reference to fig. 2, the battery 2 includes a case 5 and a battery cell housed in the case 5.

The case 5 is used to accommodate the battery cells, and the case 5 may have various structures. In some embodiments, the case 5 may include a first case portion 5a and a second case portion 5b, the first case portion 5a and the second case portion 5b being overlapped with each other, the first case portion 5a and the second case portion 5b together defining an accommodating space 5c for accommodating the battery cell. The second case portion 5b may be a hollow structure having one end opened, the first case portion 5a is a plate-like structure, and the first case portion 5a is covered on the opening side of the second case portion 5b to form a case 5 having an accommodation space 5 c; the first housing part 5a and the second housing part 5b may each be a hollow structure having one side opened, and the opening side of the first housing part 5a is closed to the opening side of the second housing part 5b to form the housing 5 having the accommodation space 5c. Of course, the first and second case portions 5a and 5b may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first casing part 5a and the second casing part 5b are connected, a sealing member, such as a sealant, a seal ring, or the like, may be provided between the first casing part 5a and the second casing part 5 b.

Assuming that the first housing part 5a is covered on top of the second housing part 5b, the first housing part 5a may also be referred to as an upper case cover, and the second housing part 5b may also be referred to as a lower case.

In the battery 2, the number of battery cells may be one or more. If the number of the battery cells is multiple, the multiple battery cells can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the multiple battery cells are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery monomers is accommodated in the box body 5; of course, a plurality of battery units may be connected in series or parallel or in series to form the battery module 6, and then the plurality of battery modules 6 may be connected in series or parallel or in series to form a whole and be accommodated in the case 5.

Fig. 3 is a schematic structural diagram of a battery module according to some embodiments of the present application.

In some embodiments, with continued reference to fig. 3, the plurality of battery cells 7 are provided, and the plurality of battery cells 7 are first connected in series or in parallel or in series-parallel to form the battery module 6. The plurality of battery modules 6 are connected in series, in parallel or in series-parallel to form a whole, and are accommodated in a case.

The plurality of battery cells 7 in the battery module 6 may be electrically connected through a bus bar member to realize parallel connection or series-parallel connection of the plurality of battery cells 7 in the battery module 6.

Fig. 4 is a schematic perspective view of a battery cell according to some embodiments of the present application, fig. 5 is a schematic exploded view of a battery cell according to some embodiments of the present application, fig. 6 is a schematic structural view of a wall portion of a battery cell according to some embodiments of the present application, fig. 7 is a schematic sectional structure along A-A of fig. 6, and fig. 8 is a schematic partially enlarged structure at F of fig. 7.

Referring to fig. 4 to 8, an embodiment of the present application provides a battery cell 7, where the battery cell 7 includes a housing 10 and a pressure release mechanism 20, the housing 10 includes a wall 11, and the pressure release mechanism 20 is disposed on the wall 11. The wall 11 includes a wall main body 111 and a reinforcing portion 112, the reinforcing portion 112 is provided around the pressure release mechanism 20, the reinforcing portion 112 includes a convex portion 1121 and a concave portion 1122, the convex portion 1121 is provided to protrude from one side of the wall main body 111 in the thickness direction X of the wall 11, the concave portion 1122 is recessed from the other side of the wall main body 111 in the thickness direction X, and the position of the convex portion 1121 corresponds to the position of the concave portion 1122.

The housing 10 is illustratively a component for forming the internal environment of the battery cell 7. Wherein the formed internal environment may be used to house the electrode assembly 50, electrolyte, and other components. Alternatively, the housing 10 may be, but is not limited to being, made of a metallic or non-metallic material, for example, copper, aluminum, or stainless steel, etc.; the nonmetallic material can be polyethylene, polypropylene, polyvinyl chloride or the like.

In some examples, battery cell 7 includes an electrode assembly 50, and electrode assembly 50 is housed within housing 10. The electrode assembly 50 is a component in which electrochemical reaction occurs in the battery cell 7, and the electrode assembly 50 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the main body portion of the electrode assembly 50, 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, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop.

The pressure release mechanism 20 is used to release the internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold value. The pressure release mechanism 20 may be detachably connected to the wall 11, or may be integrally provided on the wall 11. The pressure release mechanism 20 may be directly connected to the wall 11 or may be limited to the wall 11 by other means. By way of example, the pressure release mechanism 20 may be coupled to the wall 11 by, but not limited to, bolting, riveting, bonding, clamping, or the like.

In some examples, the pressure relief mechanism 20 and the wall 11 are integrally formed, the wall 11 is provided with a weakened portion, and the thickness of the weakened portion is smaller than that of other areas on the wall 11, and the pressure relief mechanism 20 is formed by the weakened portion and the area surrounded by the weakened portion.

The reinforcement portion 112 may be integrally provided with the wall portion 11, or may be connected to the wall portion 11 by a connection such as bolting, caulking, adhesion, or clamping.

In one example, the convex portion 1121 is convex on the side of the wall body 111 facing the inside of the battery cell 7 in the thickness direction X, and the concave portion 1122 is concave on the side facing the outside of the battery cell 7 in the thickness direction X with respect to the wall body 111.

In another example, the convex portion 1121 is convex on the side of the wall body 111 facing the outside of the battery cell 7 in the thickness direction X, and the concave portion 1122 is concave with respect to the side of the wall body 111 facing the inside of the battery cell 7 in the thickness direction X.

The position of the convex portion 1121 corresponds to the position of the concave portion 1122, and it is understood that the projection of the convex portion 1121 in the thickness direction X overlaps with the projection of the concave portion 1122 in the thickness direction X.

The reinforcement 112 may be of various shapes. For example, the convex portion 1121 is a racetrack-shaped protrusion extending along a racetrack-shaped track, and the concave portion 1122 is a racetrack-shaped groove extending along a racetrack-shaped track; for another example, the protrusion 1121 is a rectangular protrusion extending along a rectangular track, and the recess 1122 is a rectangular recess extending along a rectangular track; for another example, the protrusion 1121 is a U-shaped protrusion extending along a U-shaped track, and the recess 1122 is a U-shaped groove extending along a U-shaped track.

Optionally, the reinforcement 112 is disposed around the pressure relief mechanism 20. The reinforcement 112 may completely surround the pressure release mechanism 20, or a part of the reinforcement 112 may surround the pressure release mechanism 20. When the reinforcement 112 completely encloses the pressure relief mechanism 20, the reinforcement 112 may be a closed structure extending along a closed trajectory. When a portion of the reinforcement 112 surrounds the pressure relief mechanism 20, the reinforcement 112 may be in a discontinuous configuration or in a non-closed configuration extending along a non-closed trajectory.

According to the technical scheme, the reinforcing part 112 is arranged around the pressure relief mechanism 20, the structural strength of the position area of the pressure relief mechanism 20 can be improved by the reinforcing part 112, so that the deformation of the position area of the pressure relief mechanism 20 under the action of the gas pressure in the battery cell 7 can be reduced, the risk of abnormal opening of the pressure relief mechanism 20 can be reduced, the structural stability of the position area of the pressure relief mechanism 20 can be effectively improved, and the reliability of the battery cell 7 can be improved.

In some embodiments, the convex portion 1121 is convex on the side of the wall body 111 facing the inside of the battery cell 7 in the thickness direction X, and the concave portion 1122 is concave with respect to the side of the wall body 111 facing the outside of the battery cell 7 in the thickness direction X.

It will be appreciated that the gas inside the battery cell 7 applies a force to the wall 11 in the direction from the inside of the battery cell 7 to the outside of the battery cell 7, and the convex portion 1121 has a better resistance to the force in the top-to-bottom direction. In this way, the protrusion 1121 protrudes toward the wall body 111 in the thickness direction X toward the inside of the battery cell 7, and the resistance effect of the protrusion 1121 to the acting force exerted by the gas in the battery cell 7 can be further improved, and the structural stability of the region where the pressure release mechanism 20 is located can be further improved.

The recess 1122 is recessed with respect to the wall body 111 along the thickness direction X toward one side of the exterior of the battery cell 7, so that the recess 1122 can accommodate electrolyte that is splashed by the battery cell 7 during the injection process, and the risk of corrosion damage to the pressure release mechanism 20 caused by contamination of the pressure release mechanism 20 by the electrolyte is reduced, thereby being beneficial to improving the reliability of the battery cell 7.

In some embodiments, the battery cell 7 further includes a first insulating member 30, the first insulating member 30 being disposed on a side of the wall portion 11 facing the inside of the battery cell 7 in the thickness direction X. The first insulator 30 includes a relief space 31, and at least a portion of the convex portion 1121 is accommodated in the relief space 31.

The first insulator 30 is a member having insulating properties. The first insulating member 30 may insulate the wall 11 from the electrical connection members inside the battery cell 7. For example, the first insulating member 30 may insulate the wall portion 11 from the electrode assembly 50 to reduce the risk of short circuits. The first insulator 30 may be plastic, rubber, or the like.

The first insulating member 30 may be detachably attached to the wall portion 11, or may be integrally provided on the wall portion 11. The first insulating member 30 may be directly connected to the wall portion 11, or may be restrained to the wall portion 11 by other members. As an example, the first insulating member 30 and the wall portion 11 may be connected by, but not limited to, bolting, riveting, bonding, clamping, or the like.

The escape space 31 may be of various structures. For example, the escape space 31 has a groove structure recessed with respect to a side surface of the first insulating member 30 near the wall portion 11; for another example, the avoiding space 31 is a hole structure penetrating through the first insulating member 30 in the thickness direction X; for another example, the relief space 31 is a notch structure located at the edge of the first insulating member 30.

The projection shape of the escape space 31 in the thickness direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid, an ellipse, or the like.

Optionally, the first insulating member 30 integrally forms the avoidance space 31, which is advantageous in simplifying the manufacturing process and reducing the production cost.

At least part of the convex portion 1121 protrudes into the escape space 31, it is understood that all of the convex portion 1121 protrudes into the escape space 31, or a part of the convex portion 1121 protrudes into the escape space 31.

By providing the first insulator 30, the wall 11 can be insulated from other electrical connection members inside the battery cell 7, and the risk of short-circuiting due to contact between the wall 11 and other electrical connection members inside the battery cell 7 can be reduced. By providing the escape space 31 to escape the convex portion 1121, the risk of the convex portion 1121 interfering with the first insulator 30 to affect the insulating effect of the first insulator 30 can be reduced. Thereby contributing to further improvement in the reliability of the battery cell 7.

In some embodiments, the reinforcement 112 is annular and disposed around the pressure relief mechanism 20.

The annular reinforcing portion 112 is disposed around the pressure relief mechanism 20, and the reinforcing portion 112 can absorb stress at different positions in the circumferential direction of the pressure relief mechanism 20, so that the structural stability of the region where the pressure relief mechanism 20 is located can be further improved.

Fig. 9 is a schematic perspective view of another battery cell 7 according to some embodiments of the present application, fig. 10 is a schematic exploded view of another battery cell 7 according to some embodiments of the present application, fig. 11 is a schematic structural view of a wall portion 11 of another battery cell 7 according to some embodiments of the present application, fig. 12 is a schematic sectional structure along B-B of fig. 10, and fig. 13 is a schematic partially enlarged structure at H of fig. 12.

With continued reference to fig. 9-13, in some embodiments, the reinforcement 112 is a plurality of reinforcement 112, the plurality of reinforcement 112 being spaced apart along the circumference of the pressure relief mechanism 20.

The plurality of reinforcing portions 112 may have the same shape or different shapes. For example, a part of the reinforcing portion 112 may be linear, and the other part of the reinforcing portion 112 may be circular arc; as another example, the plurality of reinforcing portions 112 are each linear.

The number of reinforcements 112 may be, but is not limited to, two, three, four, five, six, or more.

By providing the plurality of reinforcing portions 112 at intervals along the circumferential direction of the pressure relief mechanism 20, the structural strength of the location area of the pressure relief mechanism 20 can be reinforced, the material consumption can be reduced, and the production cost can be reduced.

In some embodiments, the plurality of reinforcing portions 112 includes a first reinforcing portion 112a and a second reinforcing portion 112b, the first reinforcing portion 112a is disposed on at least one side of the pressure relief mechanism 20 in the first direction Y and extends along the first direction Y, and the second reinforcing portion 112b is disposed on at least one side of the pressure relief mechanism 20 in the second direction Z and extends along the second direction Z, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other.

Illustratively, a portion of the plurality of stiffeners 112 is configured as a first stiffener 112a and another portion of the plurality of stiffeners 112 is configured as a second stiffener 112b. The number of the first reinforcement parts 112a may be, but is not limited to, two, three, four, five, six or more. The number of second reinforcing portions 112b may be, but is not limited to, two, three, four, five, six or more.

The first reinforcement portion 112a is disposed on at least one side of the pressure release mechanism 20 in the first direction Y and extends along the first direction Y, and it is understood that the first reinforcement portion 112a is disposed on one side of the pressure release mechanism 20 in the first direction Y and extends along the first direction Y, or the first reinforcement portion 112a is disposed on two opposite sides of the pressure release mechanism 20 in the first direction Y and extends along the first direction Y.

The second reinforcement portion 112b is disposed on at least one side of the pressure release mechanism 20 in the second direction Z and extends along the second direction Z, and it is understood that the first reinforcement portion 112a is disposed on one side of the pressure release mechanism 20 in the second direction Z and extends along the second direction Z, or the first reinforcement portion 112a is disposed on two opposite sides of the pressure release mechanism 20 in the second direction Z and extends along the second direction Z.

By the cooperation of the first reinforcing portion 112a and the second reinforcing portion 112b, the plurality of reinforcing portions 112 are radially distributed around the pressure relief mechanism 20, and the structural strength of the location area of the pressure relief mechanism 20 can be further improved.

In some embodiments, the reinforcement 112 is an integral structure with the wall body 111.

On the one hand, the reinforcement 112 and the wall body 111 are not required to be connected through an additional connection process, and the manufacturing process flow is simplified. Meanwhile, compared with the connection of the reinforcing part 112 and the wall body 111 through an additional connection process, the reinforcing part 112 and the wall body 111 in an integrated structure have higher connection firmness.

In some embodiments, the first dimension of the convex portion 1121 in the thickness direction X protruding from the wall body 111 is h1, the convex portion 1121 has a second dimension d1 in the width direction perpendicular to the thickness direction X, and the first and second dimensions h1 and d1 satisfy the relationship: h1/d1 is more than or equal to 1/20 and less than or equal to 2/3.

The first dimension h1 of the convex portion 1121 protruding from the wall main body 111 in the thickness direction X refers to the height of the convex portion 1121, and the second dimension d1 refers to the width of the convex portion 1121.

As an example, the ratio h1/d1 between the first dimension h1 and the second dimension d1 may be, but is not limited to, 1/20, 1/19, 1/18, 1/17, 1/16, 1/15, 1/14, 1/13, 1/12, 1/11, 1/10, 1/9, 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2, 2/3, etc.

It will be appreciated that the aspect ratio of the boss 1121 affects the structural properties of the boss 1121 itself, which in turn affects the structural strength of the region where the pressure relief mechanism 20 is located. In this way, the aspect ratio of the protruding portion 1121 is set within the above range, so that the structural performance of the protruding portion 1121 itself can be effectively improved.

Further, the first dimension h1 and the second dimension d1 satisfy the relationship: h1/d1 is 1/5 or less and 1/2 or less, and the structural performance of the convex portion 1121 can be further improved.

As an example, the ratio h1/d1 between the first dimension h1 and the second dimension d1 may be, but is not limited to, 1/5, 21/100, 11/50, 23/100, 6/25, 1/4, 13/50, 27/100, 7/25, 29/100, 3/10, 1/3, 1/25, 1/2, etc.

In some embodiments, the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.3mm and less than or equal to 3mm.

As an example, the ratio h1/d1 between the first dimension h1 and the second dimension d1 may be, but is not limited to 0.3mm、0.4mm、0.5mm、0.6mm、0.7mm、0.8mm、0.9mm、1mm、1.2mm、1.4mm、1.6mm、1.8mm、2mm、2.2mm、2.4mm、2.6mm、2.8mm、3mm, etc.

It can be understood that the higher the height of the protruding portion 1121, the better the effect of the protruding portion 1121 on strengthening the structural strength of the region where the pressure relief mechanism 20 is located, and the higher the space occupation rate of the protruding portion 1121 itself; the smaller the height of the protruding portion 1121, the less the protruding portion 1121 has a reinforcing effect on the structural strength of the region where the pressure release mechanism 20 is located, and the lower the space occupation rate of the protruding portion 1121 itself. The structural properties of the convex portion 1121 themselves refer to strength, rigidity, and the like of the convex portion 1121.

In this way, the above technical solution sets the first dimension h1 within the above range, so that the structural strength of the location area where the pressure release mechanism 20 is located can be improved, and the energy density of the battery cell 7 can be optimized.

Further, the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.5mm and less than or equal to 1.5mm, and the balance between the structural strength of the position area where the pressure release mechanism 20 is positioned and the energy density of the battery cell 7 can be further optimized.

By way of example, the ratio h1/d1 between the first dimension h1 and the second dimension d1 may be, but is not limited to, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, and the like.

In some embodiments, in the thickness direction X, the minimum spacing between the top end of the convex portion 1121 and the bottom end of the concave portion 1122 is t, the thickness of the wall main body 111 is f, and the minimum spacing t and the thickness f satisfy the relationship: t/f is more than or equal to 0.5 and less than or equal to 2.

As an example, the ratio t/f between the minimum spacing t and the thickness f may be, but is not limited to, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

It will be appreciated that the larger the ratio t/f between the minimum spacing t and the thickness f, the better the structural performance of the convex portion 1121 itself, and the higher the space occupation rate of the convex portion 1121 itself; the smaller the ratio t/f between the minimum pitch t and the thickness f, the weaker the structural performance of the convex portion 1121 itself, and the smaller the space occupation rate of the convex portion 1121 itself. The structural properties of the convex portion 1121 themselves refer to strength, rigidity, and the like of the convex portion 1121.

In this way, the above-described configuration can improve the structural strength of the pressure release mechanism 20 in the region where the pressure release mechanism is located and optimize the energy density of the battery cell 7 by setting the ratio between the minimum distance t between the top end of the protruding portion 1121 and the bottom end of the recessed portion 1122 and the thickness f of the wall body 111 in the above-described range.

Further, the minimum spacing t and the thickness f satisfy the relationship: t/f is more than or equal to 0.8 and less than or equal to 1.2, and the balance between the structural strength of the position area where the pressure release mechanism 20 is positioned and the energy density of the battery cell 7 can be further optimized.

As an example, the ratio t/f between the minimum spacing t and the thickness f may be, but is not limited to, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, etc.

In some embodiments, the shortest distance between the stiffener 112 and the edge of the pressure relief mechanism 20 is L, the shortest distance L satisfying the relationship: l is more than 0 and less than or equal to 5mm.

As an example, the shortest distance L between the reinforcement 112 and the edge of the pressure relief mechanism 20 may be, but is not limited to 0.1mm、0.2mm、0.3mm、0.4mm、0.5mm、0.6mm、0.7mm、0.8mm、0.9mm、1mm、1.2mm、1.4mm、1.6mm、1.8mm、2mm、2.2mm、2.4mm、2.6mm、2.8mm、3mm、3.2mm、3.4mm、3.6mm、3.8mm、4mm、4.2mm、4.4mm、4.6mm、4.8mm、5mm, etc.

It will be appreciated that the closer the reinforcement 112 is to the pressure relief mechanism 20, the better the reinforcement 112 will be to the structural strength of the region of the pressure relief mechanism 20. In this way, in the above-described embodiment, the shortest distance L between the reinforcing portion 112 and the edge of the pressure release mechanism 20 is set within the above-described range, so that the reinforcing effect of the reinforcing portion 112 on the structural strength of the pressure release mechanism 20 in the position region can be improved.

Further, the shortest distance L satisfies the relationship: l is 1.5mm or less and 2.5mm or less, and the reinforcing effect of the reinforcing portion 112 on the structural strength of the pressure release mechanism 20 in the position area can be further improved.

By way of example, the shortest distance L between the reinforcement 112 and the edge of the pressure relief mechanism 20 may be, but is not limited to, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

In some embodiments, the battery cell 7 further includes a second insulating member 40, the second insulating member 40 being disposed on a side of the wall portion 11 facing the outside of the battery cell 7 in the thickness direction X. The second insulator 40 includes a relief opening 41, the relief opening 41 penetrating the second insulator 40 in the thickness direction X, and a projection of the recess 1122 in the thickness direction X is located within a projection of the relief opening 41 in the thickness direction X.

The second insulator 40 is a member having insulating properties. The second insulator 40 may insulate the wall 11 from the electrical connection parts outside the battery cell 7. For example, the first insulating member 30 may insulate the wall 11 from the busbar to reduce the risk of short circuits. The second insulator 40 may be plastic, rubber, or the like.

The second insulating member 40 may be detachably attached to the wall portion 11, or may be integrally provided on the wall portion 11. The second insulating member 40 may be directly connected to the wall portion 11 or may be restrained to the wall portion 11 by other members. As an example, the second insulating member 40 and the wall portion 11 may be connected by, but not limited to, bolting, riveting, bonding, clamping, or the like.

The projection shape of the escape opening 41 in the thickness direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid, an ellipse, or the like. As an example, the projected shape of the relief port 41 in the thickness direction X matches the projected shape of the pressure release mechanism 20 in the thickness direction X.

Alternatively, the projection of the relief mechanism 20 in the thickness direction X is located within the projection of the relief port 41 in the thickness direction X.

Optionally, the second insulating member 40 is integrally formed with the avoiding opening 41, which is beneficial to simplifying the manufacturing process and reducing the production cost.

By providing the second insulator 40, the wall 11 can be insulated from other electrical connection members outside the battery cell 7, and the risk of short-circuiting due to contact between the wall 11 and other electrical connection members outside the battery cell 7 can be reduced. By providing the relief opening 41 to relieve the recess 1122, the influence on the function of the recess 1122 to accommodate the electrolyte that splashes during the injection process of the battery cell 7 can be reduced.

In some embodiments, the housing 10 includes a shell 10a and an end cap 10b, the shell 10a having an opening, the end cap 10b for covering the opening. The end cap 10b is configured as a wall portion 11.

Illustratively, the end cap 10b refers to a member that is covered at the opening of the case 10a to isolate the internal environment of the battery cell 7 from the external environment. Alternatively, the shape of the end cap 10b may be adapted to the shape of the housing 10a to fit the housing 10a. Alternatively, the end cover 10b may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cover 10b is not easy to deform when being extruded and collided, so that the battery cell 7 can have a higher structural strength, and the reliability can be improved. Functional components of the terminal group and the like may be provided on the end cap 10 b. The material of the end cap 10b may also be various, for example, the end cap 10b may be, but not limited to, made of metal or non-metal material, for example, copper, aluminum or stainless steel; the nonmetallic material can be polyethylene, polypropylene, polyvinyl chloride or the like.

The housing 10a is an assembly for mating with the end cap 10b to form the internal environment of the battery cell 7. Wherein the formed internal environment may be used to house the electrode assembly 50, electrolyte, and other components. The case 10a and the end cap 10b may be separate members, and an opening may be provided in the case 10a, and the interior of the battery cell 7 may be formed by covering the opening with the end cap 10b at the opening. Alternatively, the end cap 10b and the housing 10a may be integrated. Specifically, the end cap 10b and the housing 10a may form a common connection surface before other components are put into the housing, and when the interior of the housing 10a needs to be sealed, the end cap 10b is closed to the housing 10a. The housing 10a may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 10a may be determined according to the specific shape and size of the electrode assembly 50. The material of the housing 10a may be various, for example, the housing 10a may be, but not limited to, made of a metal or non-metal material, for example, copper, aluminum, stainless steel, or the like; the nonmetallic material can be polyethylene, polypropylene, polyvinyl chloride or the like.

Alternatively, the end cap 10b may be detachably connected to the housing 10a, or may be integrally provided on the housing 10 a. The end cap 10b may be directly connected to the housing 10a or may be restrained to the housing 10a by other means. By way of example, the end cap 10b and the housing 10a may be connected by, but not limited to, welding, riveting, bonding, or the like.

The application also provides an end cover assembly, which comprises an end cover 10b and a pressure relief mechanism 20, wherein the pressure relief mechanism 20 is arranged on the end cover 10b. The end cap 10b includes a wall body 111 and a reinforcing portion 112, the reinforcing portion 112 is provided around the pressure release mechanism 20, the reinforcing portion 112 includes a convex portion 1121 and a concave portion 1122, the convex portion 1121 is provided to protrude from one side of the wall body 111 in the thickness direction X thereof, the concave portion 1122 is recessed from the other side of the wall body 111 in the thickness direction X, and the position of the convex portion 1121 corresponds to the position of the concave portion 1122.

In some embodiments, the convex portion 1121 is provided to protrude from one side of the wall main body 111 facing the inside of the battery cell 7 in the thickness direction X. The concave portion 1122 is recessed with respect to the wall main body 111 toward the side of the outside of the battery cell 7 in the thickness direction X.

It will be appreciated that the gas inside the cell 7 applies a force to the end cap 10b in the direction from the inside of the cell 7 to the outside of the cell 7, and the convex portion 1121 resists the force in the top-to-bottom direction more effectively. In this way, the protrusion 1121 protrudes toward the wall body 111 in the thickness direction X toward the inside of the battery cell 7, and the resistance effect of the protrusion 1121 to the acting force exerted by the gas in the battery cell 7 can be further improved, and the structural stability of the region where the pressure release mechanism 20 is located can be further improved.

In some embodiments, the end cap assembly further includes a first insulating member 30, the first insulating member 30 being disposed at a side of the end cap 10b facing the inside of the battery cell 7 in the thickness direction X. The first insulating member 30 includes a relief space 31, and at least a portion of the convex portion 1121 extends into the relief space 31.

By providing the first insulator 30, the end cap 10b can be insulated from other electrical connection members inside the battery cell 7, and the risk of short-circuiting due to contact between the end cap 10b and other electrical connection members inside the battery cell 7 can be reduced. By providing the escape space 31 to escape the convex portion 1121, the risk of the convex portion 1121 interfering with the first insulator 30 to affect the insulating effect of the first insulator 30 can be reduced. Thereby contributing to further improvement in the reliability of the battery cell 7.

According to some embodiments of the application, the application also provides a battery comprising a battery cell 7 according to any of the above aspects.

According to some embodiments of the present application, the present application further provides an electric device, including the battery cell 7 according to any one of the above aspects, where the battery cell 7 is used for providing electric energy.

For better understanding of the battery cell 7 provided in the embodiment of the present application, the embodiment of the battery cell 7 in practical application is provided herein for illustration based on the same inventive concept.

The embodiment of the application provides a battery unit 7, the battery unit 7 comprises a shell 10, a pressure release mechanism 20 and a first insulating piece 30, the shell 10 comprises a shell 10a and an end cover 10b, the shell 10a is provided with an opening, the end cover 10b is used for covering the opening, and the pressure release mechanism 20 is arranged on the end cover 10b. The end cap 10b includes a wall body 111 and a reinforcing portion 112, the reinforcing portion 112 is provided around the pressure release mechanism 20, the reinforcing portion 112 includes a convex portion 1121 and a concave portion 1122, the convex portion 1121 is provided on a side of the wall body 111 facing the inside of the battery cell 7 in the thickness direction X, and the concave portion 1122 is recessed with respect to a side of the wall body 111 facing the outside of the battery cell 7 in the thickness direction X. And the position of the convex portion 1121 corresponds to the position of the concave portion 1122.

The first insulator 30 is provided on the wall 11 on the side facing the inside of the battery cell 7 in the thickness direction X. The first insulating member 30 includes a relief space 31, and at least a portion of the convex portion 1121 extends into the relief space 31.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

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

1. A battery cell, comprising:

A housing including a wall portion;

The pressure release mechanism is arranged on the wall part;

The wall part comprises a wall main body and a reinforcing part, the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall part, the concave part is sunken relative to the other side of the wall main body along the thickness direction, and the position of the convex part corresponds to the position of the concave part;

The convex part is convexly arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction.

2. The battery cell according to claim 1, further comprising a first insulating member provided on a side of the wall portion facing the inside of the battery cell in the thickness direction;

The first insulating member includes a relief space, and at least a portion of the protruding portion is accommodated in the relief space.

3. The battery cell of claim 1, wherein the reinforcement is annular and disposed around the pressure relief mechanism.

4. The battery cell of claim 1, wherein the reinforcement is a plurality of reinforcement members spaced apart along the circumference of the pressure relief mechanism.

5. The battery cell according to claim 4, wherein the plurality of reinforcing portions includes a first reinforcing portion and a second reinforcing portion, the first reinforcing portion is disposed on at least one side of the pressure release mechanism in a first direction and extends in the first direction, the second reinforcing portion is disposed on at least one side of the pressure release mechanism in a second direction and extends in the second direction, and the first direction, the second direction, and the thickness direction are perpendicular to each other.

6. The battery cell of claim 1, wherein the reinforcement is of unitary construction with the wall body.

7. The battery cell according to claim 1, wherein a first dimension h1 of the convex portion protruding in the thickness direction from the wall main body and a second dimension d1 of the convex portion in the width direction thereof satisfy the relationship: h1/d1 is more than or equal to 1/20 and less than or equal to 2/3, and the width direction is perpendicular to the thickness direction.

8. The battery cell of claim 7, wherein the first dimension h1 and the second dimension d1 satisfy the relationship: h1/d1 is more than or equal to 1/5 and less than or equal to 1/2.

9. The battery cell of claim 7, wherein the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.3mm and less than or equal to 3mm.

10. The battery cell of claim 7, wherein the first dimension h1 satisfies the relationship: h1 is more than or equal to 0.5mm and less than or equal to 1.5mm.

11. The battery cell according to claim 1, wherein a minimum distance t between a top end of the convex portion and a bottom end of the concave portion and a thickness f of the wall body in the thickness direction satisfy the relationship: t/f is more than or equal to 0.5 and less than or equal to 2.

12. The battery cell of claim 11, wherein the minimum spacing t and the thickness f satisfy the relationship: t/f is more than or equal to 0.8 and less than or equal to 1.2.

13. The battery cell of claim 1, wherein a shortest distance L between the reinforcement and an edge of the pressure relief mechanism satisfies the relationship: l is more than 0 and less than or equal to 5mm.

14. The battery cell of claim 13, wherein the shortest distance L satisfies the relationship: l is more than or equal to 1.5mm and less than or equal to 2.5mm.

15. The battery cell according to claim 1, further comprising a second insulating member provided on a side of the wall portion facing the outside of the battery cell in the thickness direction;

The second insulating member includes an escape opening penetrating through the second insulating member in the thickness direction, and a projection of the recess in the thickness direction is located in a projection of the escape opening in the thickness direction.

16. The battery cell of any one of claims 1-15, wherein the housing comprises a shell having an opening and an end cap for covering the opening;

The end cap is configured as the wall portion.

17. An end cap assembly, comprising:

An end cap;

The pressure relief mechanism is arranged on the end cover;

the end cover comprises a wall main body and a reinforcing part, wherein the reinforcing part is arranged around the pressure relief mechanism, the reinforcing part comprises a convex part and a concave part, the convex part is convexly arranged on one side of the wall main body along the thickness direction of the wall main body, the concave part is sunken relative to the other side of the wall main body along the thickness direction, and the position of the convex part corresponds to the position of the concave part;

the convex part is arranged on one side of the wall main body facing the inside of the battery cell along the thickness direction in a protruding mode.

18. The end cap assembly of claim 17, further comprising a first insulator disposed on a side of the end cap facing the interior of the battery cell in the thickness direction;

The first insulating member includes a relief space, and at least a portion of the protruding portion extends into the relief space.

19. A battery comprising a plurality of cells according to any one of claims 1-16.

20. An electrical device comprising a cell according to any one of claims 1 to 16 for providing electrical energy.