CN217740650U

CN217740650U - Shell, battery monomer, battery and consumer

Info

Publication number: CN217740650U
Application number: CN202221171173.6U
Authority: CN
Inventors: 苏华圣; 李全坤; 邢承友; 徐春光; 杜香龙; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-11-04
Anticipated expiration: 2032-05-16

Abstract

The embodiment of the application provides a shell, a single battery, a battery and electric equipment, and belongs to the technical field of batteries. A housing including a peripheral wallAnd the groove group comprises a first groove body and a second groove body which are arranged on the peripheral wall, the first groove body and the second groove body are arranged at intervals along the circumferential direction of the peripheral wall, and the residual thickness of the peripheral wall at the position where the first groove body is arranged is smaller than the residual thickness of the peripheral wall at the position where the second groove body is arranged. Wherein the volume of the first groove body is V ₁ The volume of the second groove body is V ₂ The smaller one of the first trough body and the second trough body has a volume V ₃ And satisfies the following conditions: v is more than or equal to 0 ₁ ‑V ₂ |≤3V ₃ . The difference value of the volume of the first groove body and the volume of the second groove body is set within a reasonable range, so that the stress deformation of the peripheral wall generated at the positions of the first groove body and the second groove body is uniform, the deformation of the peripheral wall is reduced, the shape of the peripheral wall is more regular, and the assembly quality of the battery monomers is improved.

Description

Shell, battery monomer, battery and consumer

Technical Field

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

Background

With the development of new energy technology, batteries are more and more widely used, for example, in mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric steamships, electric toy cars, electric toy steamships, electric toy airplanes, electric tools, and the like.

The battery cell serves as an energy storage element, and generally chemically reacts with the electrolyte through an electrode assembly, thereby outputting electric energy. In order to ensure the normal use of the battery cell, the battery cell needs to meet certain assembly requirements, such as the assembly of the housing and the end cover. Therefore, how to improve the assembly quality of the battery cells is an urgent problem to be solved in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a shell, a single battery, a battery and electric equipment, and can effectively improve the assembly quality of the single battery.

In a first aspect, an embodiment of the present application provides a housing, which includes a peripheral wall and a groove set, where the groove set includes a first groove body and a second groove body that are disposed on the peripheral wall, and the first groove body and the second groove body are disposed along a periphery of the peripheral wallThe residual thickness of the peripheral wall at the position where the first groove body is arranged is smaller than that of the peripheral wall at the position where the second groove body is arranged; wherein the volume of the first groove body is V ₁ The volume of the second trough body is V ₂ The smaller one of the first trough body and the second trough body has a volume V ₃ And satisfies the following conditions: v is more than or equal to 0 ₁ -V ₂ |≤3V ₃ 。

Among the above-mentioned technical scheme, the difference setting of the volume of first cell body and the volume of second cell body is in reasonable within range for crowded material volume when the shaping second cell body can not differ too greatly with crowded material volume when the first cell body of shaping, make the perisporium more even in the stress deformation ratio that first cell body and second cell body position produced, reduce the deformation of perisporium, make the shape of perisporium more regular, in order to satisfy the assembly requirement of shell, improve the free assembly quality of battery.

In some embodiments, 0 ≦ V ₁ -V ₂ |≤V ₃ . Therefore, the difference between the volume of the first groove body and the volume of the second groove body is further reduced, the difference between the extrusion amount when the second groove body is formed and the extrusion amount when the first groove body is formed is reduced, stress deformation of the peripheral wall generated at the positions of the first groove body and the second groove body is more uniform, and deformation of the peripheral wall is further reduced.

In some embodiments, V ₁ ≤V ₂ . Therefore, the second groove body can be made large, and the forming difficulty of the second groove body is reduced.

In some embodiments, the depth of the first channel is greater than the depth of the second channel such that the residual thickness of the peripheral wall at the location where the first channel is located is less than the residual thickness of the peripheral wall at the location where the second channel is located. Through making the degree of depth of first cell body be greater than the degree of depth of second cell body, realize that the perisporium is less than the perisporium in the remaining thickness of the position that sets up the second cell body in the remaining thickness of the position that sets up the first cell body, realization mode is simple, can set up the perisporium to the structure that the wall thickness is even.

In some embodiments, the first channel has a depth T ₁ The depth of the second groove body is T ₂ And satisfies the following conditions: t is a unit of ₁ ≤3T ₂ . In such a way thatThe second groove body has a certain depth, so that the situation that the extruding quantity of the second groove body is insufficient due to the fact that the depth of the second groove body is small is avoided, and stress deformation of the peripheral wall generated at the positions of the first groove body and the second groove body is more uniform.

In some embodiments, the first channel has a depth T ₁ The wall thickness of the peripheral wall is L, and the following conditions are satisfied: t is more than or equal to 0.1 ₁ the/L is less than 1. The shell can be guaranteed to crack at the first groove body position to release pressure when the internal pressure reaches the detonation pressure, and the shell can be guaranteed not to crack at the first groove body position due to fatigue in the service life cycle.

In some embodiments, the groove group comprises a plurality of first groove bodies arranged at intervals along the circumferential direction of the circumferential wall, and at least one second groove body is arranged between two adjacent first groove bodies. A plurality of first cell bodies set up along the circumference interval of perisporium, and when the internal pressure of shell reached detonation pressure, the shell can carry out the pressure release from the position of a plurality of first cell bodies, improves the pressure release efficiency of shell. At least one second groove body is arranged between every two adjacent first groove bodies, so that stress deformation generated at each groove body position of the peripheral wall in the circumferential direction is more uniform, and the shape of the peripheral wall is more regular.

In some embodiments, a plurality of second grooves are provided between adjacent two of the first grooves in the circumferential direction of the circumferential wall.

In some embodiments, the first and second slots alternate circumferentially of the peripheral wall.

In some embodiments, the plurality of first groove bodies in the groove group are uniformly arranged on the peripheral wall along the circumferential direction of the peripheral wall. When the internal pressure of shell reached detonation pressure, the shell can follow the even pressure release in the position of a plurality of cell bodies, improves the pressure release efficiency of shell.

In some embodiments, the first channel and the second channel are both disposed on an outer surface of the perimeter wall. The molding difficulty of the first groove body and the second groove body is reduced.

In some embodiments, the peripheral wall has a relief, and the first slot extends around the relief along a curved path. When the internal pressure of shell reached detonation pressure, the pressure release portion will use first cell body to open as the boundary, and the position that corresponds with pressure release portion on the perisporium will form the opening, and the emission in the shell will be discharged through the opening, has great pressure release area for the emission can discharge the shell fast, has improved pressure release rate.

In some embodiments, the first channel extends along a non-closed path with a distance between the ends. When the internal pressure of the shell reaches the initiation pressure, the pressure relief part can be opened outwards in a turnover mode, the opened pressure relief part is still locally connected with other parts of the peripheral wall except the pressure relief part, and the pressure relief part cannot be separated from and fly out due to rapid discharge of emissions.

In some embodiments, the first channel comprises a first channel, a second channel and a third channel, the first channel and the third channel being disposed opposite to each other along the extension of the peripheral wall, the first channel, the second channel and the third channel being connected in series to define the pressure relief portion. The simple structure of first cell body, when the internal pressure of shell reached detonation pressure, the perisporium cracked the back along the second slot part, can cracked along first slot part and third slot part for the decompression portion outwards overturns gradually and opens, has great pressure release area.

In some embodiments, the second groove portion is arc-shaped, and the first groove portion and the third groove portion are both tangent to the second groove portion. The circular arc-shaped second groove part enables the position of the peripheral wall in the second groove part to be easier to crack than the position of the first groove part and the position of the third groove part, and the pressure relief part can be opened to a greater extent during pressure relief. Because first slot part and third slot part all are tangent with the second slot part, the perisporium splits along the second slot part back, can split along first slot part and second slot part more smoothly.

In some embodiments, the first channel extends along a closed path that is end-to-end. When the internal pressure of the shell reaches the detonation pressure, the pressure relief part can be completely separated from other parts of the peripheral wall except the pressure relief part, and the pressure relief area is larger.

In some embodiments, the second channel body is a circular, elliptical, or polygonal channel.

In some embodiments, the peripheral wall is provided with a plurality of groove groups, and the groove groups are arranged at intervals along the extending direction of the peripheral wall. The plurality of groove groups are arranged on the circumferential wall, so that the pressure relief capacity of the shell is improved, the shell can relieve pressure from more positions, and the pressure relief rate is improved.

In some embodiments, the two adjacent groove groups are respectively a first groove group and a second groove group, the first groove body in the first groove group is opposite to the second groove body in the second groove group along the extending direction of the peripheral wall, and the first groove body in the second groove group is opposite to the second groove body in the first groove group along the extending direction of the peripheral wall. The structure can ensure that the shape of the peripheral wall at each groove group position is more regular, and the shape of the peripheral wall in the area between two adjacent groove groups is more regular.

In some embodiments, two groove sets are provided on the peripheral wall.

In some embodiments, the housing is a cylinder. The difference value between the volume of the first groove body and the volume of the second groove body is set within a reasonable range, the roundness of the circumferential wall can be improved, and therefore the assembly quality of the battery monomer is improved.

In a second aspect, embodiments of the present application provide a battery cell, including an electrode assembly and the case provided in any one of the embodiments of the first aspect; the electrode assembly is accommodated in the case.

In a third aspect, an embodiment of the present application provides a battery, which includes a box and a single battery provided in any one of the embodiments of the second aspect, where the single battery is accommodated in the box.

In a fourth aspect, an embodiment of the present application further provides an electric device, including the battery provided in any one of the embodiments of the third aspect.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

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

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

fig. 3 is an exploded view of a battery cell provided in some embodiments of the present application;

FIG. 4 is a schematic structural view of the housing shown in FIG. 3;

FIG. 5 is a front view of the housing of FIG. 4;

FIG. 6 isbase:Sub>A cross-sectional view A-A of the housing shown in FIG. 5;

FIG. 7 is a front view of a housing according to other embodiments of the present application;

FIG. 8 is a cross-sectional view B-B of the housing shown in FIG. 7;

FIG. 9 is an enlarged view of a portion of the housing shown in FIG. 5 at C;

FIG. 10 is a front view of a housing provided in accordance with further embodiments of the present application;

fig. 11 is a front view of a housing provided in accordance with further embodiments of the present application.

Icon: 1-a housing; 11-a peripheral wall; 111-an outer surface; 112-a pressure relief portion; 113-a first end; 114-a second end; 12-groove group; 12 a-a first groove set; 12 b-a second groove set; 121-a first trough; 1211-first trough; 1212-a second groove portion; 1213-third groove; 122-a second trough; 13-a bottom wall; 2-an electrode assembly; 21-positive tab; 22-negative tab; 3-end cover; 4-an electrode terminal; 5-a current collecting member; 10-a battery cell; 20-a box body; 201-a first portion; 202-a second portion; 100-a battery; 200-a controller; 300-a motor; 1000-a vehicle; x-circumferential direction; z-extension direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not 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 can be included in at least one embodiment of the specification. The appearances of the phrase 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 as the case may be.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is to this also not limited.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, the positive active substance layer is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance layer protrudes out of the positive current collector which is coated with the positive active substance layer, and the positive current collector which is not coated with the positive active substance layer is used as a positive tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative plate comprises a negative current collector and a negative active substance layer, the negative active substance layer is coated on the surface of the negative current collector, the negative current collector which is not coated with the negative active substance layer protrudes out of the negative current collector which is coated with the negative active substance layer, and the negative current collector which is not coated with the negative active substance layer is used as a negative tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, a plurality of positive electrode tabs are stacked, and a plurality of negative electrode tabs are stacked. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology requires consideration of various design factors, such as energy density, cycle life, discharge capacity, charge/discharge rate, and other performance parameters, as well as battery safety.

For the single battery, in order to ensure the safety of the single battery, a pressure relief mechanism can be arranged in the single battery, and the pressure inside the single battery is released through the pressure relief mechanism so as to reduce the risks of explosion and fire of the single battery.

The inventor has noted that even if a pressure relief mechanism is provided in the battery cell, the risk of fire or explosion of the battery cell often occurs. The reason for this is that, present pressure release mechanism generally sets up the tip at the free shell of battery, and a plurality of battery monomer pile back together, the pressure release mechanism on the shell tip can be sheltered from by other battery monomer, leads to the pressure release untimely, takes place the incident.

In order to increase the pressure relief rate of the casing, the pressure relief mechanism may be disposed on a peripheral wall of the casing, for example, a pressure relief groove may be disposed on the peripheral wall of the casing, and when the internal pressure of the casing reaches the initiation pressure, the peripheral wall may be ruptured along the pressure relief groove to release the internal pressure of the casing.

The inventor finds that after the pressure relief groove bodies are arranged on the peripheral wall of the shell, along with the release of stress at the positions where the pressure relief groove bodies are arranged on the peripheral wall, the peripheral wall is easy to deform, so that the shape of the peripheral wall is irregular, the assembly requirements of the shell cannot be met, for example, the shell is difficult to assemble with the end cover, and the assembly quality of a single battery is reduced.

In view of this, an embodiment of the present application provides an enclosure, where the enclosure includes a peripheral wall and a slot group, where the slot group includes a first slot body and a second slot body that are disposed on the peripheral wall, and the first slot body and the second slot body are disposed at an interval in a circumferential direction of the peripheral wall, and a residual thickness of the peripheral wall at a position where the first slot body is disposed is smaller than a residual thickness of the peripheral wall at a position where the second slot body is disposed. The volume of the first groove body is V ₁ The volume of the second trough body is V ₂ The smaller one of the first trough body and the second trough body has a volume V ₃ And satisfies the following conditions: v is more than or equal to 0 ₁ -V ₂ |≤3V ₃ 。

In such shell, the difference value of the volume of the first groove body and the volume of the second groove body is set within a reasonable range, so that the difference between the extruding amount when the second groove body is formed and the extruding amount when the first groove body is formed is not too large, the stress deformation of the peripheral wall generated at the positions of the first groove body and the second groove body is more uniform, the deformation of the peripheral wall is reduced, the shape of the peripheral wall is more regular, the assembly requirement of the shell is met, and the assembly quality of the battery monomer is improved.

The housing described in the embodiments of the present application is suitable for a battery cell, a battery, and an electric device using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a 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 extending vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The battery 100 is provided inside 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 serve as an operation power source of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure, in which the battery 100 includes a battery cell 10 and a case 20, and the case 20 is used for accommodating the battery cell 10.

The case 20 is a component for accommodating the battery cell 10, the case 20 provides an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, and the first portion 201 and the second portion 202 cover each other to define a receiving space for receiving the battery cell 10. The first portion 201 and the second portion 202 may be in various shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first portion 201 may be a hollow structure with one side open, the second portion 202 may also be a hollow structure with one side open, and the open side of the second portion 202 is closed to the open side of the first portion 201, so as to form the box body 20 with a receiving space. The first portion 201 may have a hollow structure with one side opened, the second portion 202 may have a plate-like structure, and the second portion 202 may cover the opened side of the first portion 201 to form the case 20 having the receiving space. The first portion 201 and the second portion 202 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

In the battery 100, one or more battery cells 10 may be provided. If there are a plurality of battery cells 10, the plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 10 are connected in series or in parallel. A plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 20. Or all the single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by all the single batteries 10 is accommodated in the box 20.

In some embodiments, the battery 100 may further include a bus member, and the plurality of battery cells 10 may be electrically connected to each other through the bus member, so as to connect the plurality of battery cells 10 in series or in parallel or in series-parallel. The bus member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present disclosure, where the battery cell 10 includes a housing 1, an electrode assembly 2, and an end cap 3.

The case 1 is a member for receiving the electrode assembly 2, and the case 1 may have a hollow structure with one end opened, or the case 1 may have a hollow structure with opposite ends opened. The housing 1 may be in various shapes, such as a cylinder, a rectangular parallelepiped, etc. The material of the housing 1 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 2 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 2 may have a winding type structure in which the positive electrode sheet, the separator, and the negative electrode sheet are wound, or a lamination type structure in which the positive electrode sheet, the separator, and the negative electrode sheet are stacked. The electrode assembly 2 has a positive electrode tab 21 and a negative electrode tab 22, and the positive electrode tab 21 may be a portion of the positive electrode sheet not coated with the positive electrode active material layer, and the negative electrode tab 22 may be a portion of the negative electrode sheet not coated with the negative electrode active material layer.

The end cap 3 is a member that closes the opening of the case 1 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 3 defines a sealed space for accommodating the electrode assembly 2, an electrolyte, and other components together with the case 1. The end cap 3 may be welded to the housing 1 to close the opening of the housing 1. The shape of the end cap 3 can be adapted to the shape of the housing 1, for example, the housing 1 is a rectangular parallelepiped structure, the end cap 3 is a rectangular plate structure adapted to the housing 1, and for example, the housing 1 is a cylinder, and the end cap 3 is a circular plate structure adapted to the housing 1. The end cap 3 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In the embodiment that the shell 1 is a hollow structure with an opening formed at one end, the end covers 3 can be correspondingly arranged one by one; in the embodiment that the housing 1 is a hollow structure with two open ends, two end caps 3 may be correspondingly arranged.

The end cap 3 may be provided with an electrode terminal 4, and the electrode terminal 4 is used to electrically connect with the electrode assembly 2 to output electric power of the battery cell 10. The electrode terminal 4 and the electrode assembly 2 may be directly connected or indirectly connected, for example, the electrode terminal 4 and the positive electrode tab 21 or the negative electrode tab 22 of the electrode assembly 2 are indirectly connected through the current collecting member 5. In the embodiment shown in fig. 3, in which the end cap 3 is one in the battery cell 10, one electrode terminal 4 in the battery cell 10 may be correspondingly disposed, and the electrode terminal 4 may be connected to the positive tab 21 through the current collecting member 5, and the negative tab 22 is connected to the case 1.

Referring to fig. 4, fig. 4 is a schematic structural diagram of the housing 1 shown in fig. 3. The embodiment of the present application provides a housing 1, including a peripheral wall 11 and a slot group 12, where the slot group 12 includes a first slot 121 and a second slot 122 disposed on the peripheral wall 11, the first slot 121 and the second slot 122 are disposed at an interval along a circumferential direction X of the peripheral wall 11, and a residual thickness of the peripheral wall 11 at a position where the first slot 121 is disposed is smaller than a residual thickness of the peripheral wall 11 at a position where the second slot 122 is disposed. Wherein the first groove body 121 has a volume V ₁ The volume of the second groove 122 is V ₂ The smaller one of the first and

second grooves

121 and 122 has a volume V ₃ And satisfies the following conditions: v is more than or equal to 0 ₁ -V ₂ |≤3V ₃ 。

The peripheral wall 11 is a main body portion of the housing 1 extending in the longitudinal direction. Taking the case 1 as a cylinder as an example, the length direction of the case 1 is consistent with the axial direction, the peripheral wall 11 is a part of the case 1 extending along the axial direction, the peripheral wall 11 is a cylindrical structure surrounding the axis of the case 1, and the cross section of the peripheral wall 11 is circular ring-shaped and perpendicular to the axis of the case 1.

The housing 1 may further include a bottom wall 13, the bottom wall 13 is located at one end of the peripheral wall 11 in the extending direction Z, the bottom wall 13 and the peripheral wall 11 are integrally formed, the peripheral wall 11 is open at the end opposite to the bottom wall 13, and the housing 1 is a hollow structure with one end open.

The tank group 12 includes a plurality of tank bodies arranged on the circumferential wall 11 and arranged along the circumferential direction X of the circumferential wall 11, and a part of the tank bodies is a first tank body 121 and the other part of the tank bodies is a second tank body 122. In the groove group 12, there may be one or more first grooves 121, and there may be one or more second grooves 122. One or more groove groups 12 may be provided in the peripheral wall 11. Taking the housing 1 as an example of a cylinder, the first tank body 121 and the second tank body 122 in each tank group 12 are located on the same circumference of the peripheral wall 11.

The first groove body 121 is a pressure relief groove body, when the internal pressure of the housing 1 reaches the initiation pressure, the circumferential wall 11 can be cracked at the position of the first groove body 121 to release the internal pressure of the housing 1, and at this time, the circumferential wall 11 cannot be cracked at the position of the second groove body 122. The second tank 122 functions to correct the deformation of the peripheral wall 11 so that the shape of the peripheral wall 11 is more regular. The first groove 121 and the second groove 122 may be formed in the peripheral wall 11 by various methods, such as punch forming, milling, etc. The first and

second tanks

121 and 122 may be provided on the outer surface 111 of the peripheral wall 11, or may be provided on the inner surface of the peripheral wall 11. The shape of the first groove 121 may be the same as or different from that of the second groove 122. The first groove body 121 may be a linear groove extending along a linear trajectory, which may be circular, elliptical, polygonal, U-shaped, C-shaped, linear, or the like; the first groove 121 may be a circular, oval, polygonal groove, or the like. The second slot 122 may be a linear slot extending along a linear trajectory, which may be circular, elliptical, U-shaped, C-shaped, or linear, etc.; the second channel 122 may also be a circular, oval, polygonal channel, etc.

The remaining thickness of the peripheral wall 11 at the position where the first groove 121 is provided is the thickness of the remaining portion of the peripheral wall 11 at the position of the first groove 121 after the first groove 121 is provided. The remaining thickness of the peripheral wall 11 at the position where the second groove 122 is provided is the thickness of the remaining portion of the peripheral wall 11 at the position of the second groove 122 after the second groove 122 is provided. The residual thickness of the peripheral wall 11 at the position where the first groove body 121 is arranged is smaller than the residual thickness of the peripheral wall 11 at the position where the second groove body 122 is arranged, so that the peripheral wall 11 is weaker at the position where the first groove body 121 is arranged than at the position where the second groove body 122 is arranged, and the pressure can be normally relieved at the position of the first groove body 121 when the internal pressure of the housing 1 reaches the detonation pressure.

The volume of the first tank body 121 is equal to the volume of the material corresponding to the inner space of the first tank body 121 when the first tank body 121 is molded on the peripheral wall 11. The volume of the second groove 122 is equal to the volume of the material corresponding to the inner space of the second groove 122 when the second groove 122 is formed on the peripheral wall 11. Taking the first groove 121 and the second groove 122 as an example of press forming, when the first groove 121 is press formed, the volume (extrusion amount) of the portion of the peripheral wall 11 to be extruded and removed is equal to the volume of the first groove 121, and when the second groove 122 is press formed, the volume (extrusion amount) of the portion of the peripheral wall 11 to be extruded and removed is equal to the volume of the second groove 122.

Referring to fig. 5 and 6, fig. 5 isbase:Sub>A front view of the housing 1 shown in fig. 4, and fig. 6 isbase:Sub>A sectional view of the housing 1 shown in fig. 5 taken alongbase:Sub>A linebase:Sub>A-base:Sub>A. Taking the first groove 121 as a linear groove extending along the linear track as an example, V ₁ ＝a ₁ ×b ₁ ×T ₁ Wherein a is ₁ (not shown in fig. 5 and 6) is the length of the first channel 121 extending along the linear trajectory; b is a mixture of ₁ Is the width, T, of the first slot 121 ₁ The depth of the first groove 121; taking the second groove 122 as a rectangular groove as an example, V ₂ ＝a ₂ ×b ₂ ×T ₂ Wherein a is ₂ Is the length of the second slot 122, b ₂ Is the width, T, of the second slot 122 ₂ The depth of the second channel 122.

In the examples of the present applicationIn the above description, the volume of the first slot 121 may be smaller than that of the second slot 122, the volume of the first slot 121 may be larger than that of the second slot 122, or the volume of the first slot 121 may be equal to that of the second slot 122, at this time, any one of the first slot 121 and the second slot 122 may be referred to as the minimum. If V ₁ ＜V ₂ Then V is ₃ ＝V ₁ (ii) a If V ₂ ＜V ₁ Then V is ₃ ＝V ₂ (ii) a If V ₂ ＝V ₁ Then V is ₃ ＝V ₂ ＝V ₁ 。V ₃ Can also be expressed as ((V) ₁ +V ₂ )-|V ₁ -V ₂ |)/2。V ₁ 、V ₂ And V ₃ All units of (a) are mm ³ 。

In a general case 1, after the pressure relief groove body (the first groove body 121) is provided on the circumferential wall 11, the circumferential wall 11 may deform along with the release of the stress at the position of the pressure relief groove body, so that the case 1 may not meet the assembly requirement. Taking the case 1 as a cylinder, when the peripheral wall 11 is deformed, the roundness of the peripheral wall 11 may not meet the assembling requirement, which may affect the welding quality between the case 1 and the end cap 3.

In the embodiment of the present application, the second groove body 122 is disposed on the peripheral wall 11, and the difference between the volume of the first groove body 121 and the volume of the second groove body 122 is set within a reasonable range, so that the difference between the extrusion amount when the second groove body 122 is formed and the extrusion amount when the first groove body 121 is formed is not too large, the stress deformation of the peripheral wall 11 generated at the positions of the first groove body 121 and the second groove body 122 is relatively uniform, the deformation of the peripheral wall 11 is reduced, the shape of the peripheral wall 11 is more regular, the assembly requirement of the housing 1 is met, and the assembly quality of the battery cell 10 is improved.

Taking the case 1 as a cylinder as an example, setting the difference between the volume of the first groove body 121 and the volume of the second groove body 122 within a reasonable range can improve the roundness of the peripheral wall 11, so that the case 1 meets the assembly requirements, thereby improving the assembly quality of the battery cell 10.

In some embodiments, 0 ≦ V ₁ -V ₂ |≤V ₃ 。

Can clean upSolved if V ₁ ＜V ₂ Then satisfy V ₂ -V ₁ ≤V ₁ (ii) a If V ₂ ＜V ₁ Then satisfy V ₁ -V ₂ ≤V ₂ 。

In this embodiment, the difference between the volume of the first groove 121 and the volume of the second groove 122 is further reduced, and the difference between the extrusion amount when the second groove 122 is formed and the extrusion amount when the first groove 121 is formed is reduced, so that the stress deformation of the peripheral wall 11 at the positions of the first groove 121 and the second groove 122 is more uniform, and the deformation of the peripheral wall 11 is further reduced.

In some embodiments, V ₁ ≤V ₂ . Thus, the second slot 122 can be enlarged, and the difficulty in forming the second slot 122 is reduced.

In some embodiments, with reference to fig. 6, the depth of the first slot 121 is greater than the depth of the second slot 122, so that the residual thickness of the peripheral wall 11 at the position where the first slot 121 is disposed is less than the residual thickness of the peripheral wall 11 at the position where the second slot 122 is disposed.

The depth of the first channel 121 is greater than the depth of the second channel 122, i.e. T ₁ ＞T ₂ . The peripheral wall 11 has a thickness L, and the remaining thickness of the peripheral wall 11 at the position where the first groove 121 is provided is L ₁ The remaining thickness of the peripheral wall 11 at the position where the second groove 122 is provided is L ₂ ，L ₁ ＝L-T ₁ ，L ₂ ＝L-T ₂ Due to T ₁ ＞T ₂ Then L is ₁ ＜L ₂ 。

Taking the second groove 122 as a rectangular groove as an example, since T is ₁ ＞T ₂ It is possible to increase the length a of the second slot 122 ₂ (see FIG. 5) and/or width b ₂ (see FIG. 5) to realize V ₁ ≤V ₂ 。

By making the depth of the first groove 121 greater than the depth of the second groove 122, the residual thickness of the peripheral wall 11 at the position where the first groove 121 is provided is less than the residual thickness of the peripheral wall 11 at the position where the second groove 122 is provided, the implementation is simple, and the peripheral wall 11 can be set to have a structure with a uniform wall thickness.

In some embodimentsIn, T ₁ ≤3T ₂ 。

In this way, the second slot body 122 has a certain depth, and the situation that the material extruding amount of the second slot body 122 is insufficient due to the small depth of the second slot body 122 is avoided, so that the stress deformation of the peripheral wall 11 at the positions of the first slot body 121 and the second slot body 122 is more uniform.

In some embodiments, 0.1 ≦ T ₁ /L＜1。

Not only can the shell 1 be guaranteed to crack and release pressure at the position of the first groove body 121 when the internal pressure reaches the detonation pressure, but also the shell 1 can be guaranteed not to crack at the position of the first groove body 121 due to fatigue in the service life cycle.

In some embodiments, with continued reference to fig. 6, the groove group 12 includes a plurality of first groove bodies 121 arranged at intervals along the circumferential direction X of the circumferential wall 11, and at least one second groove body 122 is arranged between two adjacent first groove bodies 121.

One second groove 122 may be provided between two adjacent first grooves 121 along the circumferential direction X of the circumferential wall 11, or a plurality of second grooves 122 may be provided. For convenience of description, the three first grooves 121 in the groove group 12 are respectively positioned as a first pressure relief groove, a second pressure relief groove and a third pressure relief groove, the second groove 122 between the first pressure relief groove and the second pressure relief groove may be one or more, the second groove 122 between the second pressure relief groove and the third pressure relief groove may be one or more, and the second groove 122 between the third pressure relief groove and the first pressure relief groove may be one or more. The number of the second slot bodies 122 between the first pressure relief slot body and the second pressure relief slot body may be equal to or different from the number of the second slot bodies 122 between the second pressure relief slot body and the third pressure relief slot body. The number of the second grooves 122 between the second pressure relief groove and the third pressure relief groove may be equal to or different from the number of the second grooves 122 between the third pressure relief groove and the first pressure relief groove.

The plurality of first grooves 121 are arranged at intervals along the circumferential direction X of the circumferential wall 11, and when the internal pressure of the housing 1 reaches the detonation pressure, the housing 1 can be decompressed from the positions of the plurality of first grooves 121, so that the decompression efficiency of the housing 1 is improved. At least one second groove body 122 is arranged between two adjacent first groove bodies 121, so that stress deformation of the circumferential wall 11 at each groove body position in the circumferential direction X is more uniform, and the shape of the circumferential wall 11 is more regular.

In some embodiments, with reference to fig. 6, the first grooves 121 and the second grooves 122 are alternately arranged along the circumferential direction X of the circumferential wall 11.

It can be understood that, in the groove group 12, the number of the second grooves 122 is equal to that of the first grooves 121, and one second groove 122 is provided between two adjacent first grooves 121 along the circumferential direction X of the circumferential wall 11. Taking the example that the first groove body 121 and the second groove body 122 in the groove group 12 are three, the arrangement order of the three first groove bodies 121 and the three second groove bodies 122 in the groove group 12 in the circumferential direction X of the circumferential wall 11 is: first slot 121-second slot 122-first slot 121-second slot 122.

In other embodiments, referring to fig. 7 and 8, fig. 7 is a front view of the housing 1 according to other embodiments of the present application. Fig. 8 is a sectional view B-B of the housing 1 shown in fig. 7. A plurality of second groove bodies 122 are provided between adjacent two of the first groove bodies 121 in the circumferential direction X of the circumferential wall 11.

The second groove bodies 122 between the adjacent two first groove bodies 121 may be two, three, four or more in the circumferential direction X of the circumferential wall 11. The volume of each second groove 122 between two adjacent first grooves 121 is V ₂ . Illustratively, in fig. 7 and 8, two second grooves 122 are formed between two adjacent first grooves 121.

In some embodiments, referring to fig. 6 and 8, the first grooves 121 in the groove group 12 are uniformly arranged on the peripheral wall 11 along the circumferential direction X of the peripheral wall 11.

It can be understood that, in the groove group 12, along the circumferential direction X of the circumferential wall 11, the angle between any two adjacent first groove bodies 121 is equal. Taking the housing 1 as a cylinder as an example, the distance between two adjacent first grooves 121 is 360 °/N, where N is the number of the first grooves 121. For example, there are three first grooves 121 in the groove group 12, and an angle between two adjacent first grooves 121 is 120 °.

In the present embodiment, the plurality of first groove bodies 121 in the groove group 12 are uniformly disposed on the peripheral wall 11 along the circumferential direction X of the peripheral wall 11, so that the stress of the peripheral wall 11 after the plurality of first groove bodies 121 are disposed is uniformly released, and the deformation of the peripheral wall 11 is reduced. In addition, when the internal pressure of the housing 1 reaches the detonation pressure, the housing 1 can uniformly release pressure from the positions of the plurality of first groove bodies 121, thereby improving the pressure release efficiency of the housing 1.

In some embodiments, with continued reference to fig. 6 and 8, the first and

second slots

121, 122 are disposed on the outer surface 111 of the peripheral wall 11.

Taking the housing 1 as a cylinder as an example, the outer surface 111 is the outer cylindrical surface of the peripheral wall 11.

During forming, the first groove body 121 and the second groove body 122 are both recessed from the outer surface 111 of the peripheral wall 11 along the wall thickness direction of the peripheral wall 11, so that the forming difficulty of the first groove body 121 and the second groove body 122 is reduced, and the first groove body 121 and the second groove body 122 are conveniently formed in a stamping mode.

In some embodiments, referring to fig. 9, fig. 9 is a partial enlarged view of the housing 1 shown in fig. 5 at a point C, the peripheral wall 11 has a pressure relief portion 112, and the first slot 121 extends around the pressure relief portion 112 along a bending track.

The pressure relief portion 112 is an area defined by the first slot 121 extending along the bending track on the peripheral wall 11, and the first slot 121 is located at an edge position of the pressure relief portion 112. The bending track is a linear track, which can be in various shapes, such as a circle, an ellipse, a polygon, a U-shape, a C-shape, etc.

When the internal pressure of the housing 1 reaches the detonation pressure, the pressure relief portion 112 is opened with the first groove body 121 as a boundary, an opening portion is formed in the position, corresponding to the pressure relief portion 112, on the peripheral wall 11, the emissions in the housing 1 are discharged through the opening portion, and the pressure relief area is large, so that the emissions can be rapidly discharged out of the housing 1, and the pressure relief rate is improved.

In some embodiments, with continued reference to fig. 9, the first slot 121 extends along a non-closed path with a distance between the end and the tail.

The non-closed tracks are linear tracks, and the non-closed tracks can be in various shapes, such as U-shaped and C-shaped. As shown in fig. 9, taking the non-closed track as a U-shape as an example, the first groove 121 is a U-shaped groove, and a U-shaped area defined by the first groove 121 is the pressure relief portion 112.

When the internal pressure of the housing 1 reaches the initiation pressure, the pressure relief portion 112 can be opened outward in an inverted manner, the opened pressure relief portion 112 remains partially connected to the other portions of the peripheral wall 11 except for the pressure relief portion 112, and the pressure relief portion 112 does not escape and fly due to rapid discharge of the emissions.

In some embodiments, with continued reference to fig. 9, the first slot 121 includes a first slot 1211, a second slot 1212 and a third slot 1213, the first slot 1211 and the third slot 1213 are disposed opposite to each other along the extending direction Z of the peripheral wall 11, and the first slot 1211, the second slot 1212 and the third slot 1213 are sequentially connected to define the pressure relief portion 112.

The first groove portion 1211 and the third groove portion 1213 may each extend in the circumferential direction X (not shown in fig. 9) of the peripheral wall 11, and the second groove portion 1212 may be linear or non-linear extending in the extending direction Z of the peripheral wall 11. The first, second and

third groove portions

1211, 1212 and 1213 are connected in sequence to form a U-shaped structure, and it is understood that the first groove 121 is a U-shaped groove.

Taking the case 1 as a cylinder, the extending direction Z of the peripheral wall 11 is the axial direction of the peripheral wall 11.

It can be understood that in the present embodiment, the first groove body 121 is a linear groove extending along the linear track, and then V ₁ ＝a ₁ ×b ₁ ×T ₁ . Wherein, a ₁ Is the sum of the extended length of the first groove portion 1211, the extended length of the second groove portion 1212, and the extended length of the third groove portion 1213.

In the present embodiment, the first groove 121 has a simple structure, and when the internal pressure of the housing 1 reaches the initiation pressure, the peripheral wall 11 can be split along the first groove 1211 and the third groove 1213 after splitting along the second groove 1212, so that the pressure relief portion 112 is gradually turned outward and opened, and has a large pressure relief area.

In some embodiments, referring to fig. 9, the second groove portion 1212 is circular, and the first groove portion 1211 and the third groove portion 1213 are tangent to the second groove portion 1212.

The position of the middle point of the circular arc-shaped second groove portion 1212 is tangent to a straight line arranged along the extending direction Z of the peripheral wall 11, at which the peripheral wall 11 is more easily ruptured, and the position of the middle point of the second groove portion 1212 is used as a starting position of the rupture of the peripheral wall 11 along the first groove body 121 during the pressure relief process, so that the peripheral wall 11 is more easily ruptured at the position of the second groove portion 1212 than at the position of the first groove portion 1211 and at the position of the third groove portion 1213, and the pressure relief portion 112 can be opened to a greater extent during the pressure relief process. Since the first groove 1211 and the third groove 1213 are both in contact with the second groove 1212, the peripheral wall 11 can be more smoothly split along the first groove 1211 and the second groove 1212 when the peripheral wall 11 is split along the second groove 1212.

In other embodiments, the first slot 121 extends along a closed path that is end-to-end.

The closed track is a linear track, and the closed track can be in various shapes, such as a circle, an ellipse and a polygon.

When the internal pressure of the housing 1 reaches the detonation pressure, the relief portion 112 can be completely separated from the other portions of the peripheral wall 11 except for the relief portion 112, and has a larger relief area.

In some embodiments, the second slot body 122 is a circular slot, an oval slot, or a polygonal slot. The polygonal groove comprises a three-edge groove, a rectangular groove, a trapezoidal groove, a parallelogram groove, a pentagonal groove, a hexagonal groove and the like. Illustratively, in fig. 4-6, the second slot body 122 is a rectangular slot.

It can be understood that if the second slot body 122 is a circular slot, the cross section of the slot side of the second slot body 122 is circular; if the second groove body 122 is an elliptical groove, the cross section of the groove side surface of the second groove body 122 is elliptical; if the second groove body 122 is a polygonal groove, the cross section of the groove side surface of the second groove body 122 is polygonal. Wherein the cross section of the groove side is perpendicular to the depth direction of the second groove body 122.

In some embodiments, referring to fig. 10 and 11, fig. 10 is a front view of a housing 1 according to still other embodiments of the present application; fig. 11 is a front view of a housing 1 according to further embodiments of the present application. The peripheral wall 11 is provided with a plurality of groove groups 12, and the groove groups 12 are arranged at intervals along the extending direction Z of the peripheral wall 11.

In this embodiment, the groove groups 12 on the peripheral wall 11 may be two, three, four or more. The pressure relief capacity of the shell 1 is improved, so that the shell 1 can be relieved from more positions, and the pressure relief rate is improved.

In some embodiments, with continued reference to fig. 10 and fig. 11, two adjacent groove sets 12 are a first groove set 12a and a second groove set 12b, respectively, a first groove body 121 in the first groove set 12a and a second groove body 122 in the second groove set 12b are disposed opposite to each other along the extending direction Z of the peripheral wall 11, and a first groove body 121 in the second groove set 12b and a second groove body 122 in the first groove set 12a are disposed opposite to each other along the extending direction Z of the peripheral wall 11.

One first groove 121 of the first groove group 12a may be disposed opposite to one second groove 122 of the second groove group 12b in the extending direction Z of the peripheral wall 11, and one first groove 121 of the second groove group 12b may be disposed opposite to one second groove 122 of the first groove group 12a in the extending direction Z of the peripheral wall 11. For example, as shown in fig. 10, a second groove 122 is disposed between two first grooves 121 in the first groove group 12a, and a second groove 122 is also disposed between two first grooves 121 in the second groove group 12b, so that one first groove 121 in the first groove group 12a and one second groove 122 in the second groove group 12b are disposed opposite to each other along the extending direction Z of the peripheral wall 11, and one first groove 121 in the second groove group 12b and one second groove 122 in the first groove group 12a are disposed opposite to each other along the extending direction Z of the peripheral wall 11.

One first groove body 121 in the first groove group 12a may be disposed opposite to the plurality of second groove bodies 122 in the second groove group 12b in the extending direction Z of the peripheral wall 11, and one first groove body 121 in the second groove group 12b may be disposed opposite to the plurality of second groove bodies 122 in the first groove group 12a in the extending direction Z of the peripheral wall 11. For example, as shown in fig. 11, two second groove bodies 122 are disposed between two first groove bodies 121 in the first groove group 12a, and two second groove bodies 122 are also disposed between two first groove bodies 121 in the second groove group 12b, so that one first groove body 121 in the first groove group 12a and two second groove bodies 122 in the second groove group 12b are disposed opposite to each other in the extending direction Z of the peripheral wall 11, and one first groove body 121 in the second groove group 12b and two second groove bodies 122 in the first groove group 12a may be disposed opposite to each other in the extending direction Z of the peripheral wall 11.

The first groove bodies 121 in the first groove group 12a and the first groove bodies 121 in the second groove group 12b are arranged offset from each other in the circumferential direction X of the circumferential wall 11, the circumferential wall 11 may be divided into a plurality of regions in the circumferential direction X of the circumferential wall 11, and the first groove bodies 121 in the first groove group 12a and the first groove bodies 121 in the second groove group 12b are alternately arranged in the plurality of regions. Taking the first groove bodies 121 in the first groove group 12a and the second groove group 12b as an example, the circumferential wall 11 may be divided into six regions along the circumferential direction X of the circumferential wall 11, and the three first groove bodies 121 in the first groove group 12a and the three first groove bodies 121 in the second groove group 12b are alternately arranged in the six regions. In two adjacent regions, one first groove body 121 in the first groove group 12a and the corresponding second groove body 122 in the second groove group 12b are located in one region, and one first groove body 121 in the second groove group 12b and the corresponding second groove body 122 in the first groove group 12a are located in the other region, so that the sum of the volumes of the first groove body 121 and the second groove body 122 in one region is substantially equal to the sum of the volumes of the first groove body 121 and the second groove body 122 in the other region, and the shape of the region of the peripheral wall 11 between the two adjacent groove groups 12 is more regular.

This structure not only makes the shape of the peripheral wall 11 at each groove group 12 more regular, but also makes the shape of the peripheral wall 11 in the region between two adjacent groove groups 12 more regular. Taking the case 1 as a cylinder as an example, for each groove group 12, since the difference between the volume of the first groove body 121 and the volume of the second groove body 122 is set within a reasonable range, the shape of the circumferential wall 11 at the position where the groove group 12 is provided is more regular, and the roundness of the circumferential wall 11 at the position where the groove group 12 is provided is improved; with respect to two adjacent groove groups 12, since the first groove body 121 in the first groove group 12a and the at least one second groove body 122 in the second groove group 12b are disposed opposite to each other in the extending direction Z of the peripheral wall 11, and the first groove body 121 in the second groove group 12b and the at least one second groove body 122 in the first groove group 12a are disposed opposite to each other in the extending direction Z of the peripheral wall 11, this structure can improve the roundness of the region of the peripheral wall 11 between the two adjacent groove groups 12.

In some embodiments, with continued reference to fig. 10 and 11, two groove sets 12 are provided on the peripheral wall 11.

Illustratively, along the extending direction Z of the peripheral wall 11, the peripheral wall 11 has a first end 113 and a second end 114 opposite to each other, two groove sets 12 are respectively close to the first end 113 and the second end 114, the distance from the groove set 12 close to the first end 113 is smaller than the distance between the two groove sets 12, and the distance from the groove set 12 close to the second end 114 is also smaller than the distance between the two groove sets 12. The distance of the groove group 12 near the first end 113 to the first end 113 may be equal to the distance of the groove group 12 near the second end 114 to the second end 114 in the extension direction Z of the peripheral wall 11.

In some embodiments, the housing 1 is a cylinder.

The embodiment of the application provides a battery cell 10, which comprises an electrode assembly 2 and a shell 1 provided by any one of the above embodiments, wherein the electrode assembly 2 is accommodated in the shell 1.

The embodiment of the application provides a battery 100, which comprises a box body 20 and the single battery 10 provided by any one of the above embodiments, wherein the single battery 10 is accommodated in the box body 20.

The embodiment of the present application provides an electric device, including the battery 100 provided in any one of the above embodiments.

The powered device may be any of the devices described above that employ battery 100.

In addition, as shown in fig. 10, the present embodiment further provides a cylindrical housing, which includes a peripheral wall 11 and two slot groups 12, each slot group 12 includes a plurality of first slot bodies 121 and a plurality of second slot bodies 122 arranged on the peripheral wall 11, the first slot bodies 121 and the second slot bodies 122 are arranged at intervals along a circumferential direction X of the peripheral wall 11, one second slot body 122 is arranged between two adjacent first slot bodies 121 along the circumferential direction X of the peripheral wall 11 (not shown in fig. 10), and a residual thickness of the peripheral wall 11 at a position where the first slot body 121 is arranged is smaller than a residual thickness of the peripheral wall 11 at a position where the second slot body 122 is arranged. The first groove body 121 in one groove group 12 and the other groove groupThe second tank bodies 122 in the groove groups 12 are arranged oppositely in the extending direction Z of the peripheral wall 11, and the first tank body 121 in the other groove group 12 is arranged oppositely to the second tank body 122 in the one groove group 12 in the extending direction Z of the peripheral wall 11. Wherein the first groove body 121 has a volume V ₁ The volume of the second groove 122 is V ₂ The smaller one of the first and

second grooves

For each groove group 12, since the difference between the volume of the first groove body 121 and the volume of the second groove body 122 is set within a reasonable range, the shape of the peripheral wall 11 at the position where the groove group 12 is provided is made more regular, and the roundness of the peripheral wall 11 at the position where the groove group 12 is provided is improved; with respect to the two groove groups 12, since the first groove body 121 in one groove group 12 and the second groove body 122 in the other groove group 12 are disposed opposite to each other in the extending direction Z of the circumferential wall 11, and the first groove body 121 in the other groove group 12 and the second groove body 122 in the one groove group 12 are disposed opposite to each other in the extending direction Z of the circumferential wall 11, the circularity of the region of the circumferential wall 11 between the adjacent two groove groups 12 can be improved, thereby improving the circularity of the cylindrical shell as a whole.

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

The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An enclosure, comprising:

a peripheral wall;

the groove group comprises a first groove body and a second groove body which are arranged on the peripheral wall, the first groove body and the second groove body are arranged at intervals along the circumferential direction of the peripheral wall, and the residual thickness of the peripheral wall at the position where the first groove body is arranged is smaller than the residual thickness of the peripheral wall at the position where the second groove body is arranged;

wherein the volume of the first groove body is V ₁ The volume of the second groove body is V ₂ The volume of the smaller one of the first trough body and the second trough body is V ₃ And satisfies the following conditions: v is more than or equal to 0 ₁ -V ₂ |≤3V ₃ 。

2. A casing according to claim 1, wherein | V > 0 ≦ V ₁ -V ₂ |≤V ₃ 。

3. The housing of claim 1, wherein V is ₁ ≤V ₂ 。

4. The enclosure of claim 1, wherein the depth of the first slot is greater than the depth of the second slot such that the residual thickness of the perimeter wall at the location where the first slot is disposed is less than the residual thickness of the perimeter wall at the location where the second slot is disposed.

5. The enclosure of claim 4, wherein the first channel has a depth T ₁ The depth of the second groove body is T ₂ Satisfies the following conditions: t is a unit of ₁ ≤3T ₂ 。

6. The enclosure of claim 1, wherein the first channel has a depth T ₁ The wall thickness of the peripheral wall is L, and the following conditions are met: t is more than or equal to 0.1 ₁ /L＜1。

7. The housing of claim 1, wherein the groove group comprises a plurality of the first grooves arranged at intervals along a circumferential direction of the circumferential wall, and at least one of the second grooves is arranged between two adjacent first grooves.

8. The housing according to claim 7, wherein a plurality of the second grooves are provided between adjacent two of the first grooves in a circumferential direction of the circumferential wall.

9. The enclosure of claim 7, wherein the first slots alternate with the second slots in a circumferential direction of the peripheral wall.

10. The housing of claim 7, wherein the first slots of the slot set are disposed uniformly about the perimeter wall in a circumferential direction of the perimeter wall.

11. The enclosure of any one of claims 1-10, wherein the first channel and the second channel are both disposed on an outer surface of the perimeter wall.

12. The enclosure of any one of claims 1-10, wherein the peripheral wall has a relief portion, the first slot extending around the relief portion along a curved trajectory.

13. The enclosure of claim 12, wherein the first channel extends along a non-closed path having a distance from end to end.

14. The housing of claim 13, wherein the first slot includes a first slot, a second slot, and a third slot, the first slot and the third slot being disposed opposite to each other along an extension direction of the peripheral wall, the first slot, the second slot, and the third slot being connected in sequence to define the pressure relief portion.

15. The housing of claim 14, wherein the second slot portion is circular arc-shaped, and the first slot portion and the third slot portion are each tangent to the second slot portion.

16. The enclosure of claim 12, wherein the first channel extends along an end-to-end closed path.

17. The enclosure of any one of claims 1-10, wherein the second channel body is a circular, elliptical, or polygonal channel.

18. A casing according to any one of claims 1 to 10, wherein a plurality of said groove sets are provided in said peripheral wall, said groove sets being spaced apart along the extent of said peripheral wall.

19. The housing of claim 18, wherein two adjacent slot sets are a first slot set and a second slot set, respectively, the first slot of the first slot set and the second slot of the second slot set are disposed opposite to each other along the extending direction of the peripheral wall, and the first slot of the second slot set and the second slot of the first slot set are disposed opposite to each other along the extending direction of the peripheral wall.

20. A casing according to claim 18, wherein two of said groove sets are provided in said peripheral wall.

21. A casing according to any one of claims 1 to 10, wherein the casing is a cylinder.

22. A battery cell, comprising:

the housing of any one of claims 1-21;

an electrode assembly housed within the case.

23. A battery, comprising:

a box body;

the battery cell of claim 22, the battery cell being housed within the case.

24. An electrical device comprising the battery of claim 23.