CN216872119U

CN216872119U - Single battery shell, single battery, battery and electric equipment

Info

Publication number: CN216872119U
Application number: CN202220382733.6U
Authority: CN
Inventors: 叶伟青; 韩丰胜
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-07-01
Anticipated expiration: 2032-02-23

Abstract

The embodiment of the application provides a single battery shell, a single battery, a battery and electric equipment. The single battery shell comprises a bottom wall, two opposite first side walls and two opposite second side walls, wherein the area of the first side walls is smaller than that of the second side walls. The first surface of the first side wall far away from the inside of the shell is provided with a first groove sunken towards the inside of the shell, the second surface of the first side wall towards the inside of the shell is provided with a first convex part corresponding to the first groove and protruding towards the inside of the shell, the first groove and the first convex part extend along a first direction, and the first direction is perpendicular to the bottom wall. The first convex part that the first lateral wall of the free casing of battery of this application embodiment set up can increase the intensity of casing, has improved the security of battery.

Description

Single battery shell, single battery, battery and electric equipment

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. If the safety of the battery is not guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a single battery shell, a single battery, a battery and electric equipment, and can enhance the safety of the battery.

In a first aspect, a battery cell housing is provided, including: the battery pack comprises a bottom wall, two opposite first side walls and two opposite second side walls, wherein the bottom wall, the first side walls and the second side walls enclose a containing space for containing an electrode assembly of the battery cell, and the area of the first side walls is smaller than that of the second side walls; the first surface of the first side wall, which is far away from the inside of the shell, is provided with a first groove which is sunken towards the inside of the shell, the second surface of the first side wall, which faces towards the inside of the shell, is provided with a first convex part which is corresponding to the first groove and is convex towards the inside of the shell, the first groove and the first convex part extend along a first direction, and the first direction is perpendicular to the bottom wall.

In this application embodiment, be provided with first convex part at the first side wall of the free casing of battery, compare in the scheme that casing surface is level and smooth, increased the intensity of casing to make the difficult gaseous extrusion deformation that produces of charge-discharge in-process of casing by the battery, effectively avoid because of the casing warp the single leakproofness of battery that leads to poor, safety problems such as electrolyte blowout in the casing have even improved the security performance of battery. In addition, be provided with first recess at first lateral wall, reduced the weight energy density of casing, make the battery monomer more light, facilitate the use, and first recess has increased the specific surface area of casing first surface, is favorable to the module structure to glue the coating assembly, has improved the bonding strength of casing with other battery parts, has strengthened the mechanical strength of battery to improve the ability of the resistant vibration and the resistant impact of battery, improved the security performance of battery.

In some embodiments, an end of the first protrusion near the opening of the accommodating space has a predetermined distance from a plane in which the opening is located.

Therefore, when the end, close to the opening of the accommodating space, of the first convex part is machined and molded, a certain space is formed to form a smooth cambered surface, and the risk that the electrode assembly is scratched by the corner of the first convex part when the electrode assembly is placed into the shell is avoided.

In some embodiments, the predetermined distance is not less than 10 mm. Therefore, the problem that the space of the smooth cambered surface formed at one end of the first convex part close to the opening of the accommodating space is insufficient due to the fact that the preset distance is too small can be avoided.

In some embodiments, a width of the first protrusion in a direction perpendicular to the second sidewall is no greater than 10 mm. When the width of the first protrusion in the direction perpendicular to the second sidewall is too large, the first protrusion protruding from the second surface of the first sidewall may contact the electrode assembly inside the case, and may scratch the electrode assembly.

In some embodiments, the height of the first protrusion protruding from the second surface is 3-10 mm. When the height of the first convex part protruding from the second surface is too high, the first convex part protruding from the second surface can contact with the electrode assembly in the shell, and the electrode assembly is scratched, and even when the width of the first convex part along the direction vertical to the second side wall is too large, the space for placing the electrode assembly is occupied, so that the space for placing the electrode assembly in the shell is insufficient. Meanwhile, the height of the first convex part protruding out of the second surface is not too small, otherwise, the strength of the shell cannot be effectively improved.

In some embodiments, the housing is provided with at least two first protrusions, which are aligned in a direction perpendicular to the second sidewall.

Every first lateral wall in two relative first lateral walls all is provided with a first convex part at least, and the quantity of the first convex part that two relative first lateral walls set up is the same, and the position corresponds, can guarantee like this that the casing is when receiving the interior gas extrusion of casing, and the lateral wall atress of relative both sides is even, non-deformable.

In some embodiments, a third surface of the bottom wall away from the interior of the housing is provided with a second groove recessed toward the interior of the housing, a fourth surface of the bottom wall facing the interior of the housing is provided with a second protrusion protruding toward the interior of the housing corresponding to the second groove, and the second groove and the second protrusion extend in a second direction perpendicular to the first side wall.

By providing the bottom wall of the housing with the second convex portion, the strength of the bottom wall is increased, and the strength of the housing is further increased. In addition, be provided with the second recess at the diapire, reduced the weight energy density of casing, make the battery monomer more light, facilitate the use, and the second recess has increased the specific surface area of casing diapire, is favorable to the module structure to glue the coating assembly, has improved the bonding strength of casing with other battery parts, has strengthened the mechanical strength of battery to improve the ability of vibration-resistant and shock-resistant of battery, improved the security performance of battery.

In some embodiments, the first groove is in communication with the second groove.

Like this, first recess and second recess intercommunication form "L" shape recess, have further increased the specific surface area of casing surface, are favorable to the module structure to glue the coating assembly, improve the mechanical strength of battery to promote the security performance of battery.

In some embodiments, a width of the second protrusion in a direction perpendicular to the second sidewall is no greater than 10 mm. When the width of the second protrusion in the direction perpendicular to the second sidewall is too large, the second protrusion protruding from the fourth surface of the bottom wall may contact the electrode assembly inside the case, and may scratch the electrode assembly.

In some embodiments, the length of the second protrusion in a direction perpendicular to the first sidewall is 3-10 mm. When the length of the second protrusion in the direction perpendicular to the first sidewall is too long, the second protrusion protruding from the fourth surface may contact the electrode assembly inside the case, and may scratch the electrode assembly. Meanwhile, the length of the second convex part along the direction perpendicular to the first side wall is not too small, otherwise, the strength of the bottom wall cannot be effectively improved.

In some embodiments, the first convex portion and the second convex portion are semi-cylindrical or semi-arc shaped.

Therefore, when the first convex part and the second convex part are machined and formed, the convex parts of the first convex part and the second convex part, which are positioned in the shell, are smooth cambered surfaces, and the convex parts are prevented from scraping an electrode assembly in the shell.

In a second aspect, a battery cell is provided, including: a housing of a battery cell as described in the first aspect or any one of the possible implementations of the first aspect; an electrode assembly disposed in the receiving space; and the end cover is used for covering the opening of the accommodating space.

In some embodiments, the electrode assemblies are annular, and a junction of two adjacent electrode assemblies forms an avoidance space of the first convex portion, and the first convex portion is disposed in the avoidance space.

When the electrode assembly is annular, the curved surfaces of two adjacent electrode assemblies are tangent to form an avoiding space, so that the first convex part can be arranged in the avoiding space to avoid contacting with the electrode assembly, and the first convex part is prevented from occupying the space for placing the electrode assembly in the shell.

In a third aspect, a battery is provided, including: a plurality of battery cells as described in the second aspect or any one of the possible implementations of the second aspect.

In a fourth aspect, there is provided an electrical device comprising: a battery as in the third aspect or any one of the possible implementations of the third aspect, the battery to provide electrical energy.

Drawings

Various additional 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. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

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

fig. 5 is a top view of the housing of the battery cell of fig. 4;

fig. 6 is a side view of the housing of the battery cell of fig. 4;

fig. 7 is a partial schematic view of a top view of the housing of the battery cell of fig. 4;

fig. 8 is a schematic view of a housing of a battery cell according to some embodiments of the present application;

fig. 9 is a front view of a housing of the battery cell of fig. 8;

FIG. 10 is a schematic diagram of a battery cell according to some embodiments of the present disclosure

Fig. 11 is a top view of a case containing an electrode assembly according to some embodiments of the present application.

In the drawings, the drawings are not necessarily to scale.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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. It is explicitly and implicitly understood by a person skilled in the art that the embodiments described herein can be combined with other embodiments.

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

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In this application, a battery refers to a physical module including one or more battery cells to provide electrical energy. 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.

In order to meet different power requirements, a plurality of battery cells in the battery can be connected in series, in parallel or in series-parallel, wherein series-parallel refers to a mixture of series connection and parallel connection. Alternatively, a plurality of battery cells 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 battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanded.

In addition to improving the performance of batteries, safety issues are a considerable problem in the development of battery technology. The inventor notices that in the charge-discharge use of battery, because electrolyte decomposes and produces gas, leads to free casing internal gas expansion extrusion casing and top cap of battery, causes free casing of battery and top cap deformation, tears the welding seam between casing and top cap, reduces the welding seam intensity of casing and top cap, can influence the normal of explosion-proof valve and open, causes the safety problem easily. Moreover, the explosion of the case and the cap is easily caused, and the active material in the battery cell is sprayed out, which causes a more serious problem of high-voltage safety of the battery.

Through further research of the inventor, the existing single battery shell surface is a flat plane, when electrolyte is decomposed to generate gas and the gas expands to extrude the shell, the flat shell surface has low strength and is easily extruded and deformed, and when the gas expands to extrude the shell, the shell can be extruded and burst, so that the safety of the battery is affected.

In order to solve the problems that the strength of the shell of the single battery is low, and the safety of the battery is poor due to the deformation of the shell, the applicant researches and discovers that the structure of the shell of the single battery can be improved. Based on the consideration, the inventor designs a single battery casing through intensive research, and the first side wall that two face areas are less of this casing is provided with first convex part, compares in the scheme that casing surface is level, has increased the intensity of casing to make the difficult gaseous extrusion deformation that produces of charge-discharge in-process of casing by the battery, effectively avoid because of the casing warp the single battery leakproofness that leads to poor, safety problems such as electrolyte blowout in the casing even, improved the security performance of battery. In addition, be provided with first recess at first lateral wall, reduced the weight energy density of casing, make the battery monomer more light, facilitate the use, and first recess has increased the specific surface area of casing first surface, is favorable to the module structure to glue the coating assembly, has improved the bonding strength of casing with other battery parts, has strengthened the mechanical strength of battery to improve the ability of the resistant vibration and the resistant impact of battery, improved the security performance of battery.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system comprising the battery cell, the battery and the like disclosed by the application can be used, so that the reliability and the safety of the battery are improved.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments will be described by taking a vehicle 1 as an example of an electric device according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power source of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation in starting, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1.

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 11.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

As shown in fig. 3, which is a schematic structural diagram of a battery cell 20 according to an embodiment of the present disclosure, the battery cell 20 includes one or more electrode assemblies 22, a case 21, and an end cap 24. The housing 21 and end cap 24 form an outer shell or battery compartment. The wall of the case 21 and the end cap 24 are both referred to as the wall of the battery cell 20, wherein for the rectangular parallelepiped battery cell 20, the wall of the case 21 includes a bottom wall and four side walls, which are connected to form a receiving space 23 in which the electrode assembly 22 is placed. The case 21 is determined according to the shape of the one or more electrode assemblies 22 after being combined, for example, the case 21 may be a hollow rectangular parallelepiped, or a square or cylinder, and one of the faces of the case 21 has an opening so that the one or more electrode assemblies 22 can be placed in the case 21. For example, when the housing 21 is a hollow rectangular parallelepiped or cube, one of the planes of the housing 21 is an open plane, that is, the plane has no wall body so that the housing 21 communicates inside and outside. When the housing 21 may be a hollow cylinder, the end surface of the housing 21 is an open surface, i.e., the end surface has no wall body so that the housing 21 communicates with the inside and the outside. The end cap 24 covers the opening of the receiving space 23 and is connected with the case 21 to form a closed cavity in which the electrode assembly 22 is placed. The case 21 is filled with an electrolyte, such as an electrolytic solution.

The battery cell 20 may further include two electrode terminals 241, and the two electrode terminals 241 may be disposed on the end cap 24. The end cap 24 is generally in the shape of a flat plate, and two electrode terminals 241 are fixed on the flat plate surface of the end cap 24, the two electrode terminals 241 being a positive electrode terminal 241a and a negative electrode terminal 241b, respectively. One connecting member 25, which may also be referred to as a current collecting member 25, is disposed at each of the electrode terminals 241, between the end cap 24 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminals 241.

As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222 a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal by one connecting member 25, and the second tab 222a of one or more electrode assemblies 22 is connected to the other electrode terminal by the other connecting member 25. For example, the positive electrode terminal 241a is connected to a positive electrode tab through one connecting member 25, and the negative electrode terminal 241b is connected to a negative electrode tab through the other connecting member 25.

In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 3, 4 independent electrode assemblies 22 are provided in the battery cell 20.

Fig. 4 shows a schematic structural diagram of the housing 21 of the battery cell 20 according to an embodiment of the present application. As shown in fig. 4, the case 21 includes a bottom wall 210, two opposite first side walls 211 and two opposite second side walls 212, wherein the area of the first side walls 211 is smaller than that of the second side walls 212, and the bottom wall 210, the first side walls 211 and the second side walls 212 enclose to form a receiving space 23 for receiving the electrode assembly 22 of the battery cell 20.

The housing 21 of the battery cell 20 is formed by connecting and enclosing a bottom wall 210, two opposite first side walls 211 and two opposite second side walls 212, the two opposite first side walls 211 and the two opposite second side walls 212 form four side walls of the housing 21, and four sides of the bottom wall 210 are respectively connected with the four side walls to form an accommodating space 23 for accommodating the electrode assembly 22 of the battery cell 20. Each wall is welded, glued or otherwise connected to each other, but this is not a limitation of the present application.

In the present embodiment, as shown in fig. 4, a first surface 2121 of the first side wall 211 away from the interior of the housing 21 is provided with a first groove 2111 recessed toward the interior of the housing 21. Correspondingly, a first protrusion 2112 corresponding to the first groove 2111 is further provided on the first side wall 211, as shown in fig. 5, a second surface 2122 of the first side wall 211 facing the interior of the housing 21 is provided with a first protrusion 2112 corresponding to the first groove 2111 and protruding toward the interior of the housing 21, and the first groove 2111 and the first protrusion 2112 extend along a first direction, which is a height direction of the first groove 2111 and the first protrusion 2112 on the first side wall 211, and the first direction is perpendicular to the bottom wall 210, for example, a Z direction in fig. 6.

First notch 2111 is defined by first surface 2121 recessed into housing 21, which may be formed by a variety of processes, such as stamping, machining, etc. First protrusion 2112 is formed by second surface 2122 protruding into the housing, and this protrusion can be obtained by various processes, such as stamping, machining, etc.

Because the first side wall 2111 of the housing 21 is provided with the first convex portion 2112, compared with the scheme that the surface of the housing 21 is flat, the strength of the housing 21 is increased, so that the housing 21 is not easily extruded and deformed by gas generated in the charging and discharging processes of the battery 10, the safety problems that the sealing performance of the battery cell 20 is poor due to the deformation of the housing 21, even the electrolyte in the housing 21 is sprayed out and the like are effectively avoided, and the safety performance of the battery 10 is improved. In addition, first recess 2111 is provided with at first lateral wall 2111, has reduced the weight energy density of casing, makes the battery monomer lighter, facilitates the use, and first recess 2111 has increased the specific surface area of the first surface 2121 of casing 21, is favorable to the gluey coating assembly of module structure, has improved the adhesive strength of casing 21 with other battery parts, has strengthened the mechanical strength of battery 10 to the resistant vibration of battery 10 and the ability of shock resistance have been improved, the security performance of battery 10 has been improved.

In the present embodiment, an end of the first protrusion 2112 near the opening of the accommodating space 23 has a predetermined distance from a plane in which the opening is located, for example, a predetermined distance L as shown in fig. 6, which is a perpendicular distance from the end of the first protrusion 2112 near the opening of the accommodating space 23 to the plane in which the opening is located.

Thus, when the end of the first protrusion 2112 close to the opening of the receiving space 23 is formed, a certain space forms a smooth arc surface, and the risk of being scratched by the corner of the first protrusion 2112 when the electrode assembly 22 is placed in the case 21 is avoided.

In the embodiment of the present application, the predetermined distance is not less than 10 mm. This can avoid the problem that the predetermined distance is too small, resulting in insufficient space for the first protrusion 2112 to form a rounded arc at the end close to the opening of the accommodating space 23.

In the present embodiment, the width of the first protrusion 2112 in the direction perpendicular to the second side wall 212 is not more than 10 mm. For example, the width L1 as shown in fig. 7 is not greater than 10 mm.

The width of the first protrusion 2112 in the direction perpendicular to the second sidewall 212 can be controlled by controlling the size of the working mold that forms the first protrusion 2112.

When the width of the first protrusion 2112 in the direction perpendicular to the second sidewall 212 is too large, the first protrusion 2112 protruding from the second surface 2122 of the first sidewall 2111 may contact the electrode assembly 22 inside the case 21, and may scratch the electrode assembly 22, and even when the width of the first protrusion 2112 in the direction perpendicular to the second sidewall 212 is too large, a space for placing the electrode assembly 22 is occupied, so that there is not enough space for placing the electrode assembly 22 inside the case 21, and thus the width of the first protrusion 2112 in the direction perpendicular to the second sidewall 212 is set to be not more than 10 mm.

In the embodiment of the present application, the height of the first protrusion 2112 protruding from the second surface 2122 is 3-10 mm. For example, as shown in FIG. 7, the height L2 is 3 to 10 mm.

When the height of the first protrusion 2112 protruding from the second surface 2122 is too high, the first protrusion 2122 may contact the electrode assembly 22 inside the case 21, and may scratch the electrode assembly 22, and even when the width of the first protrusion 2112 in the direction perpendicular to the second side wall 212 is too large, the space for placing the electrode assembly 22 is occupied, and there is not enough space for placing the electrode assembly 22 inside the case 21. Meanwhile, the height of the first protrusion 2112 protruding from the second surface 2122 is not too small, otherwise, the strength of the housing 21 cannot be effectively improved, so the height of the first protrusion 2112 protruding from the second surface 2122 is set to be 3-10 mm.

In the present embodiment, the housing 21 is provided with at least two first protrusions 2112, and the at least two first protrusions 2112 are aligned in a direction perpendicular to the second side wall 212. Each of the two first side walls 211 of the case 21 is provided with at least one first protrusion 2112, the number of the first protrusions 2112 being adjusted according to the number of the electrode assemblies, for example, 2 first protrusions 2112 are provided between 2 electrode assemblies, 6 first protrusions 2112 are provided between 4 electrode assemblies, and so on. The drawings in the present application exemplify that 4 electrode assemblies 22 are accommodated in the accommodation space 23, and the first side wall 211 is provided with 6 first protrusions 2112.

Each first side wall 211 of the two opposite first side walls 211 is at least provided with one first convex portion 2112, the number of the first convex portions 2112 arranged on the two opposite first side walls 211 is the same, and the positions of the first convex portions are corresponding, so that the side walls on the two opposite sides are uniformly stressed and are not easily deformed when the shell 21 is extruded by gas in the shell 21.

Fig. 8 is a schematic structural diagram of the housing 21 according to an embodiment of the present application, and as shown in a cross-sectional view of the XOZ plane of the portion a in fig. 8, a third surface 2123 of the bottom wall 210 away from the interior of the housing 21 is provided with a second groove 2113 recessed toward the interior of the housing 21, a fourth surface 2124 of the bottom wall 210 facing the interior of the housing 21 is provided with a second protrusion 2114 corresponding to the second groove 2113 and protruding toward the interior of the housing 21, and the second groove 2113 and the second protrusion 2114 extend in a second direction perpendicular to the first side wall 211, for example, in the Y direction shown in fig. 8.

Second notch 2113 is defined by third surface 2123 recessed toward the interior of housing 21, which may be formed by a variety of processes, such as stamping, machining, etc. The second protrusion 2114 is formed by the fourth surface 2124 protruding towards the inside of the housing 21, and the protrusion can be obtained by various processes, such as punching, machining, and the like.

By providing the bottom wall 210 of the housing 21 with the second protrusion 2114, the strength of the bottom wall 210 is increased, further increasing the strength of the housing 21. In addition, be provided with second recess 2113 at diapire 210, reduced the weight energy density of casing 21, make battery monomer 20 lighter, facilitate the use, and second recess 2113 has increased the specific surface area of diapire 210 of casing 21, be favorable to the gluey coating assembly of module structure, improved the adhesive strength of casing 21 with other battery parts, strengthened the mechanical strength of battery 10, thereby the ability of vibration-resistant and shock-resistant of battery 10 has been improved, the security performance of battery 10 has been improved.

In the embodiment of the present application, as shown in fig. 8, the first notch 2111 communicates with the second notch 2113, so that the first notch 2111 communicates with the second notch 2113 to form an "L" shaped notch, and in this case, the first protrusion 2112 corresponding to the first notch 2111 communicates with the second protrusion 2114 corresponding to the second notch 2113 to form an "L" shaped protrusion.

Thus, the first notch 2111 and the second notch 2113 are communicated to form an L-shaped notch, the specific surface area of the outer surface of the shell 21 is further increased, module structure glue coating and assembly are facilitated, the mechanical strength of the battery 10 is improved, and the safety performance of the battery 10 is improved.

In the present embodiment, the width of the second protrusion 2114 in the direction perpendicular to the second side wall 212 is not more than 10 mm. For example, as shown in fig. 9, the width L3 is not greater than 10 mm.

The width of the second protrusion 2114 in the direction perpendicular to the second sidewall 212 can be controlled by controlling the size of a processing device that forms the second protrusion 2114.

When the width of the second protrusion 2114 in the direction perpendicular to the second side wall 212 is too large, the second protrusion 2114 protruding from the fourth surface 2124 of the bottom wall 210 may contact the electrode assembly 22 inside the case 21, and may scratch the electrode assembly 22, and even when the width of the second protrusion 2114 in the direction perpendicular to the second side wall 212 is too large, a space for placing the electrode assembly 22 is occupied, so that there is not enough space for placing the electrode assembly 22 inside the case 21, and thus the width of the second protrusion 2114 in the direction perpendicular to the second side wall 212 is set to be not more than 10 mm.

In the embodiment of the present application, the length of the second protrusion 2114 in the direction perpendicular to the first sidewall 211 is 3 to 10mm, and as shown in fig. 9, the length L4 is 3 to 10 mm.

The length of the second protrusion 2114 in the direction perpendicular to the first side wall 211 corresponds to the height of the first protrusion 2112 protruding from the second surface 2122, and when the length of the second protrusion 2114 in the direction perpendicular to the first side wall 211 is too long, the second protrusion 2114 protruding from the fourth surface 2124 may contact the electrode assembly 22 inside the case 21, and there is a risk of scratching with the electrode assembly 22, and even when the length of the second protrusion 2114 in the direction perpendicular to the first side wall 211 is too large, a space for placing the electrode assembly 22 is occupied, so that there is not enough space for placing the electrode assembly 22 inside the case 21. Meanwhile, the length of the second protrusion 2114 in the direction perpendicular to the first sidewall 211 is also not too small, otherwise the strength of the bottom wall 210 cannot be effectively improved, so the length of the second protrusion 2114 in the direction perpendicular to the first sidewall 211 is set to be 3-10 mm.

In the present embodiment, the first protrusion 2112 and the second protrusion 2114 have a semi-cylindrical shape or a semi-arc shape, and in the drawings, the first protrusion 2112 and the second protrusion 2114 are illustrated as being semi-cylindrical.

The first convex portion 2112 and the second convex portion 2114 having a semi-cylindrical shape or a semi-arc shape can be formed by providing a processing mold for forming the first convex portion 2112 and the second convex portion 2114 with a semi-cylindrical shape or a semi-arc shape.

Thus, when the first protrusion 2112 and the second protrusion 2114 are formed, the protruding portions of the first protrusion and the second protrusion inside the case 21 are smooth curved surfaces, and the protruding portions are prevented from scraping the electrode assembly 22 inside the case 21.

As shown in fig. 10, an embodiment of the present application further provides a battery cell 20, including: the housing 21 as described in any of the above embodiments; an electrode assembly 22 disposed in the receiving space 23; and an end cap 24 for covering the opening of the accommodating space 23.

In the embodiment of the present application, as shown in fig. 11, the electrode assemblies 22 are annular, the junction of two adjacent electrode assemblies 22 forms the avoidance space 25 of the first protrusion 2112, and the first protrusion 2112 is disposed in the avoidance space 25.

When the electrode assembly 22 is annular, curved surfaces of two adjacent electrode assemblies 22 are tangent to each other, and an avoidance space may be formed, so that the first protrusion 2112 may be disposed in the avoidance space 25 to avoid contact with the electrode assembly 22, and the first protrusion 2112 may avoid occupying a space in the case 21 where the electrode assembly 22 is placed. Meanwhile, the escape space 25 may also accommodate the second protrusion 2114, avoiding the second protrusion 2114 from occupying the space in the case 21 where the electrode assembly 22 is placed.

An embodiment of the present application further provides a battery 10, which includes a plurality of battery cells 20 as described in any of the above embodiments.

An embodiment of the application also provides an electric device. The battery 10 is included in the above embodiment, the battery 10 is used for providing electric energy, and alternatively, the electric device may be a vehicle 1, a ship, a spacecraft, or the like, but the embodiment of the present application is not limited thereto.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery cell housing (21), comprising: a bottom wall (210), two opposite first side walls (211) and two opposite second side walls (212), the bottom wall (210), the first side walls (211) and the second side walls (212) enclosing a receiving space (23) for receiving an electrode assembly (22) of the battery cell, the first side walls (211) having an area smaller than that of the second side walls (212);

wherein, a first surface (2121) of the first side wall (211) far away from the interior of the housing (21) is provided with a first groove (2111) recessed towards the interior of the housing (21), a second surface (2122) of the first side wall (211) facing towards the interior of the housing (21) is provided with a first convex part (2112) corresponding to the first groove (2111) and protruding towards the interior of the housing (21), the first groove (2111) and the first convex part (2112) extend along a first direction, and the first direction is perpendicular to the bottom wall (210).

2. A housing (21) according to claim 1, wherein an end of the first protrusion (2112) near the opening of the receiving space (23) has a predetermined distance from the plane of the opening.

3. A housing (21) according to claim 2, characterized in that the predetermined distance is not less than 10 mm.

4. The housing (21) according to claim 1, wherein a width of the first protrusion (2112) in a direction perpendicular to the second side wall (212) is not more than 10 mm.

5. The housing (21) of claim 1, wherein the first protrusion (2112) protrudes from the second surface (2122) by a height of 3-10 mm.

6. A housing (21) according to claim 1, wherein the housing (21) is provided with at least two first protrusions (2112), at least two first protrusions (2112) being aligned in a direction perpendicular to the second side wall (212).

7. An enclosure (21) as claimed in any of claims 1 to 6, wherein a third surface (2123) of the bottom wall (210) remote from the interior of the enclosure (21) is provided with a second recess (2113) recessed towards the interior of the enclosure (21), and a fourth surface (2124) of the bottom wall (210) facing the interior of the enclosure (21) is provided with a second protrusion (2114) protruding towards the interior of the enclosure (21) corresponding to the second recess (2113), the second recess (2113) and the second protrusion (2114) extending in a second direction perpendicular to the first side wall (211).

8. The housing (21) of claim 7, wherein the first recess (2111) communicates with the second recess (2113).

9. The housing (21) according to claim 7, wherein a width of the second protrusion (2114) in a direction perpendicular to the second side wall (212) is not more than 10 mm.

10. The housing (21) according to claim 7, wherein the length of the second protrusion (2114) in a direction perpendicular to the first side wall (211) is 3-10 mm.

11. The housing (21) according to claim 7, wherein the first protrusion (2112) and the second protrusion (2114) have a semi-cylindrical shape or a semi-arc shape.

12. A battery cell, comprising:

-a housing (21) according to any one of claims 1 to 11;

an electrode assembly (22) disposed in the accommodation space (23);

and the end cover (24) is used for covering the opening of the accommodating space (23).

13. The battery cell according to claim 12, wherein the electrode assemblies (22) are annular, a joint of two adjacent electrode assemblies (22) forms an avoidance space (25) of the first protrusion (2112), and the first protrusion (2112) is disposed in the avoidance space (25).

14. A battery, comprising: a plurality of battery cells according to claim 12 or 13.

15. An electrical device, comprising: the battery of claim 14, said battery for providing electrical energy.