CN219017775U

CN219017775U - Housing, battery cell, battery and electricity utilization device

Info

Publication number: CN219017775U
Application number: CN202222976097.2U
Authority: CN
Inventors: 吴宁生; 杨开焕; 白璐璐; 梅祥; 杨道伟; 李全坤
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-05-12
Anticipated expiration: 2032-11-07

Abstract

The application discloses a casing, battery monomer, battery and power consumption device relates to battery technology field, and the casing includes including bottom plate, curb plate and transition fillet, and the bottom plate has first internal wall surface, and first internal wall surface includes first surface and second surface, and the periphery side of first surface is located to the second surface, and the curb plate has the second internal wall surface, and the transition fillet has the third internal wall surface, and the third internal wall surface is connected second surface and second internal wall surface; at least one of the second surface and the third inner wall surface is formed with an avoidance groove, and the avoidance groove is configured to avoid corner portions of the battery cell. The shell of this application can avoid the electric core to be pressed and hinder, has simplified the single structure of battery simultaneously.

Description

Housing, battery cell, battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a shell, a battery cell, a battery and an electric device.

Background

In the related art, in the molding process of the single battery shell, a transition fillet is formed at a bending position, so that the inner bottom of the shell is uneven.

For this reason, in some technologies, a bottom support plate is generally separately arranged in a shell to raise a battery cell on standing at a certain height, so as to prevent interference between the edge of the battery cell and the inner wall surface of the shell, resulting in crush injury and decarburization of the edge of the battery cell, and the bottom support plate needs to be separately assembled, so that the assembly process of the battery cell is relatively complex and the cost is relatively high.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the related art. Therefore, the application provides a shell, which can avoid the cell from being crushed and simplify the structure of the battery cell.

The application also provides a battery cell with the shell.

The application also provides a battery with the battery cell.

The application also provides an electric device with the battery.

According to the shell of this application first aspect embodiment for hold battery cell, the shell includes bottom plate, curb plate and transition fillet, the curb plate connect in the outward flange of bottom plate, transition fillet transitional coupling is in the bottom plate with between the curb plate, just the transition fillet the curb plate with the bottom plate defines and holds the chamber, hold the chamber and be used for holding the cell, the bottom plate has the orientation hold the first internal face in chamber, first internal face includes first surface and second surface, the second surface is located the periphery side of first surface, the curb plate has the orientation hold the second internal face in chamber, the transition fillet has the orientation hold the third internal face in chamber, the third internal face is connected the second surface with the second internal face, wherein, the second surface with at least one of the third internal face is formed with dodges the recess, just the recess is constructed as the corner of cell.

According to the shell, the avoidance groove is formed on at least one of the second surface of the bottom plate and the third inner wall surface of the transition fillet, so that the distance between the battery cell and the inner wall surface of the shell is increased, and the corner part of the battery cell is prevented from being crushed by the inner wall surface of the shell; therefore, the battery cell standing station is not required to be set up to a certain height on the bottom support plate alone at the shell, so that the assembly process and the fixing process of the bottom support plate are saved, the installation cost of the bottom support plate is reduced, for example, the bottom support plate is fixedly arranged at the hot melting cost of the shell, the number of battery monomer parts is reduced, and the structure of a battery monomer is simplified.

In some embodiments, the housing has a first reference curved arcuate surface and a reference plane, the first reference curved arcuate surface is tangent to the second inner wall surface and the reference plane, respectively, and the third inner wall surface is concavely disposed with respect to the first reference curved arcuate surface such that the third inner wall surface is formed with the relief groove. Therefore, on the premise of ensuring that the corner part of the battery cell is not interfered with the bottom plate and the transition fillet, the structure of avoiding the groove is simplified, and the processing is convenient.

In some embodiments, the first surface and the second surface are both disposed coplanar with the reference plane; alternatively, at least one of the first surface and the second surface is provided protruding from the reference plane to form a supporting protrusion. It can be seen that the first surface and the second surface are provided flexibly, so that the shell can meet the different requirements of different battery monomers.

In some embodiments, the casing has a first reference arc curved surface and a reference plane, the first reference arc curved surface is tangent to the second inner wall surface and the reference plane respectively, the second surface is concavely arranged relative to the reference plane, so that the second surface is formed with the avoidance groove, the first surface protrudes out of the reference plane to form a supporting protrusion, and then the supporting protrusion can stand on the battery cell at a certain height, so that the corner part of the battery cell is further far away from the transition fillet and the second surface.

In some embodiments, the casing has a reference plane, the curved surface where the third inner wall surface is located is tangent to the second inner wall surface and the reference plane, at least one of the first surface and the second surface protrudes out of the reference plane to form a supporting protrusion, and then the supporting protrusion can stand the battery cell on the standing position by a certain height, so that the corner part of the battery cell is further far away from the transition fillet and the second surface.

In some embodiments, the two circumferential ends of the arc-shaped curved surface where the third inner wall surface is located are a first end and a second end, the first end is connected with the second inner wall surface, the second end is connected with the reference plane, the second surface protrudes out of the reference plane, the supporting protrusion extends to between the first end and the second end, and the structural strength of the bottom plate is convenient to guarantee on the premise that the corner part of the battery core and the shell are avoided.

In some embodiments, the projection area of the supporting protrusion on the plane perpendicular to the thickness direction of the bottom plate is s1, and the projection area of the bottom plate on the plane perpendicular to the thickness direction of the bottom plate is s, and s1/s is less than or equal to 0.1 and less than or equal to 0.9, so that the supporting protrusion can be conveniently designed in a diversified shape on the premise of ensuring the reliable arrangement of the battery cells.

In some embodiments, at least one of the first surface and the second surface protrudes from the reference plane to form a supporting protrusion, and the height of the supporting protrusion protruding from the reference plane is h, and is more than or equal to 0.1mm and less than or equal to 2.0mm, so that the supporting protrusion can be used for standing on the battery cell at a proper height position, and the corner part of the battery cell is not interfered with the inner wall of the shell.

In some embodiments, the supporting protrusion includes at least one rib extending in a long shape along a straight line or a curved line, so as to facilitate flexible adjustment of a supporting area of the supporting protrusion.

In some embodiments, the plurality of ribs includes at least one first rib and at least one second rib, the first rib extends in a long strip shape along a first direction, the second rib extends in a long strip shape along a second direction, and the first direction and the second direction intersect, so that stable support of the plurality of ribs on the battery cell is guaranteed.

In some embodiments, the ribs include third ribs that extend in a ring shape along a circumferential direction of the bottom plate to ensure stable support of the cells by the third ribs.

In some embodiments, the third ribs are a plurality of, and the third ribs are coaxially arranged, so that stable support of the third ribs on the battery cell is further ensured.

In some embodiments, the ribs extend continuously or intermittently to further flexibly adjust the support area of the support protrusions.

In some embodiments, the support protrusions are formed as solid protrusions and the support protrusions are formed as circular structures, oval structures, or polygonal structures. From this, the supporting bulge sets up in a flexible way, is convenient for satisfy actual differentiation demand.

In some embodiments, at least one of the first surface and the second surface is configured to abut a cell; and/or, at least one of the first surface and the second surface is provided with a containing groove for containing electrolyte, so that stable arrangement of the battery cell and infiltration effect of the electrolyte on the bottom of the battery cell are both facilitated.

In some embodiments, the bottom plate has an outer wall surface facing away from the accommodating cavity, and the outer wall surface is formed into a plane, so as to simplify the processing procedure of the outer wall surface and facilitate the arrangement of the batteries.

In some embodiments, the casing has first benchmark curved surface and reference plane, first benchmark curved surface with the second internal wall face with the reference plane is tangent respectively, first surface protrusion in the reference plane sets up, in order to form the supporting bulge, the bottom plate has the dorsad hold the outer wall face in chamber, the outer wall face is formed with first recess, first recess with the supporting bulge sets up relatively, is favorable to promoting the material utilization of bottom plate.

In some embodiments, the first groove has a depth t,0 < t.ltoreq.2 mm; and/or the height of the supporting protrusion protruding out of the reference plane is equal to the depth of the first groove, so that the structural strength of the bottom plate is ensured.

In some embodiments, the bottom plate has an outer wall surface facing away from the accommodating cavity, and the outer wall surface is formed with at least one reinforcing rib, so that the structural strength of the bottom plate is improved, and the problem of safety caused by degumming of the bottom of the shell and a pack interface due to excessive deformation of the bottom plate is prevented.

In some embodiments, the reinforcing ribs are long-strip-shaped, simple in structure and convenient to arrange.

In some embodiments, the outer wall surface is formed with a first groove, and the reinforcing rib is formed on the bottom wall of the first groove, so that the occupied space of the shell is saved.

In some embodiments, the height of the reinforcing rib is smaller than or equal to the depth of the first groove, and the reinforcing rib does not protrude from the outer wall surface, so as to save the occupied space of the housing.

In some embodiments, the first inner wall surface is further formed with a second groove, and the second groove is disposed opposite to the reinforcing rib along the thickness direction of the bottom plate, so as to improve the material utilization rate of the bottom plate.

In some embodiments, the base plate is an integral stamping, facilitating tooling.

A battery cell according to an embodiment of the second aspect of the present application comprises a housing according to an embodiment of the first aspect of the present application described above.

In some embodiments, the battery cell further comprises a battery cell, the battery cell is accommodated in the accommodating cavity of the housing, the battery cell is provided with a bottom wall, a side wall and a connecting wall, the connecting wall is connected with the bottom wall and the side wall, the connecting wall extends along the length direction of the transition fillet, the battery cell is further provided with a second reference arc-shaped curved surface, the second reference arc-shaped curved surface is tangent to the bottom wall and the side wall respectively, and the connecting wall is located on the radial inner side of the second reference arc-shaped curved surface.

A battery according to an embodiment of a third aspect of the present application includes a battery cell according to an embodiment of the second aspect of the present application described above.

An electrical device according to an embodiment of a fourth aspect of the present application comprises a battery according to an embodiment of the above third aspect of the present application, the battery being configured to provide electrical energy.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of an electrical device 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 a schematic view of the battery module shown in fig. 2;

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

FIG. 5 is another schematic view of the battery cell shown in FIG. 4;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;

FIGS. 7 a-7 k are partial cross-sectional views of a housing according to various embodiments of the present application;

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

FIG. 9 is an enlarged view of portion C of FIG. 8;

FIG. 10 is a bottom view of the housing shown in FIG. 8;

FIGS. 11 a-11 g are top views of a housing according to various embodiments of the present application;

FIG. 12 is a partial cross-sectional view of a housing according to some embodiments of the present application;

fig. 13 is a cross-sectional view of a battery cell according to some embodiments of the present application;

fig. 14 is an enlarged view of a portion D circled in fig. 13;

FIG. 15 is a cross-sectional view of the housing shown in FIG. 13;

FIG. 16 is another cross-sectional view of the housing shown in FIG. 15;

FIG. 17 is an enlarged view of portion E of FIG. 16;

FIG. 18 is a bottom view of the housing shown in FIG. 16;

FIG. 19 is a top view of a housing according to some embodiments of the present application;

FIG. 20 is a cross-sectional view taken along line F-F in FIG. 19;

fig. 21 is an enlarged view of a portion G circled in fig. 20;

FIG. 22 is a bottom view of the housing shown in FIG. 19;

FIG. 23 is a bottom view of a housing according to further embodiments of the present application;

fig. 24 a-24 j are partial cross-sectional views of battery cells according to various embodiments of the present application.

Reference numerals:

power consumption device 1000, battery 200, controller 300, motor 400,

Battery cell 100, battery module 101,

A case 102, a first case portion 102a, a second case portion 102b, a housing space 102c,

A shell 1, a avoiding groove 1a, a containing cavity 10, an opening 10a,

A first reference arc-shaped curved surface R1, a first end R11, a second end R12, a reference plane R2,

A bottom plate 11,

A first inner wall surface 11a, a first surface 11b, a second surface 11c, a receiving groove 11d,

An outer wall surface 11e, a first groove 11f, a second groove 11g,

Support protrusions 111, ribs 1111, first ribs 1111a, second ribs 1111b, third ribs 1111c,

A reinforcing rib 112,

A side plate 12, a second inner wall surface 12a,

A transition fillet 13, a third inner wall surface 13a,

A top cover 2,

A battery core 3, a second reference arc-shaped curved surface R3,

A main body 31, a tab 32, a bottom wall 311, a side wall 312, a connecting wall 313,

An insulating film 4, a first insulating portion 41, and a second insulating portion 42.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

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

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

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

In the present application, the battery cell 100 may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in the embodiment of the present application. The battery cell 100 may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which are not limited in this embodiment. The battery cells 100 are generally divided into three types in a package manner: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

References to battery 200 in the embodiments of the present application refer to a single physical module that includes one or more battery cells 100 to provide higher voltages and capacities. For example, the battery 200 mentioned in the present application may be the battery module 101 or the battery pack or the like. The battery 200 generally includes a case 102 for enclosing one or more battery cells 100, and the case 102 can prevent liquid or other foreign materials from affecting the charge or discharge of the battery cells 100; of course, the battery 200 may not include the case 102.

For example, the battery cell 100 includes a battery cell 3 and an electrolyte, and the battery cell 3 is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell 100 operates primarily by virtue of metal ions moving between the positive and negative electrode tabs. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. 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 electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode 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 high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The battery cell 100 further includes a case 1 and a top cover 2, the case 1 having an opening 10a, the top cover 2 being provided to cover the opening 10a and being hermetically connected such that the case 1 and the top cover 2 form a receiving chamber 10 for receiving the battery cell 3 and the electrolyte. The housing 1 may be made of a material such as aluminum, aluminum alloy, or plastic.

The material of the separator may be PP (polypropylene) or PE (polyethylene). Of course, the battery cell 100 using the solid electrolyte may not be provided with a separator.

The inventor finds that in the forming process of the single battery shell, a transition fillet is formed at a bending position, so that the inner bottom of the shell is uneven, and a bottom support plate is usually arranged in the shell independently to avoid interference between the edge of the battery core and the inner wall surface of the shell, so that the assembly process is complex.

In view of this, the present application provides a technical solution, under the premise of ensuring the structural strength and the use reliability of the housing 1, by providing at least one of the second surface 11b of the bottom plate 11 and the third inner wall surface 13a of the transition fillet 13 with an avoidance groove 1a, so as to increase the distance between the cell 3 and the inner wall surface of the housing 1, so that a proper distance is provided between the corner portion of the cell 3 and the transition fillet 13 of the housing 1, so as to avoid the situation that the corner portion of the cell 3 is crushed by the transition fillet 13, resulting in decarburization of the cell 3, resulting in reduced capacity of the cell 3 and easy short circuit of the cell 3; therefore, the battery cell 3 is placed on top of the standing position by a certain height without independently arranging the bottom support plate on the shell 1, so that the assembly process and the fixing process of the bottom support plate are saved, the installation cost of the bottom support plate is reduced, for example, the hot melting cost of the bottom support plate fixedly arranged on the shell 1 is reduced, the number of parts of the battery cell 100 is reduced, and the structure of the battery cell 100 is simplified.

The technical solution described in the embodiments of the present application is applicable to a battery 200 and an electric device 1000 using the battery 200, where the battery 200 is used to provide electric energy.

The power consumption device 1000 may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the present application does not particularly limit the above-described power consumption device 1000.

For convenience of description, the following embodiments will be described with reference to the power consumption device 1000 as an example of a vehicle.

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

As shown in fig. 1, the vehicle is provided with a battery 200, and the battery 200 may be provided at the bottom, or at the head, or at the tail of the vehicle. The battery 200 may be used for power supply of a vehicle, for example, the battery 200 may be used as an operating power source of the vehicle.

The vehicle may also include a controller 300 and a motor 400, the controller 300 being configured to control the battery 200 to power the motor 400, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

In some embodiments of the present application, battery 200 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle to provide driving power for the vehicle instead of or in part instead of fuel oil or natural gas.

Fig. 2 is a schematic diagram of a battery 200 provided in some embodiments of the present application.

As shown in fig. 2, the battery includes a case 102 and a battery cell 100, and the battery cell 100 is accommodated in the case 102.

The case 102 is for accommodating the battery cell 100, and the case 102 may have various structures. In some embodiments, the case 102 may include a first case portion 102a and a second case portion 102b, the first case portion 102a and the second case portion 102b being mutually covered, the first case portion 102a and the second case portion 102b together defining an accommodating space 102c for accommodating the battery cell 100. The second case portion 102b may be a hollow structure having one end opened, the first case portion 102a is a plate-like structure, and the first case portion 102a is covered on the opening side of the second case portion 102b to form a case 102 having an accommodation space 102 c; the first case 102a and the second case 102b may each have a hollow structure with one side opened, and the opening side of the first case 102a is closed to the opening side of the second case 102b to form the case 102 having the accommodation space 102c. Of course, the first and

second case portions

102a and 102b may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first housing 102a and the second housing 102b are connected, a sealing member, such as a sealant, a seal ring, or the like, may be provided between the first housing 102a and the second housing 102 b.

Assuming that the first housing portion 102a is covered on top of the second housing portion 102b, the first housing portion 102a may also be referred to as an upper case cover, and the second housing portion 102b may also be referred to as a lower case.

In the battery 200, the number of the battery cells 100 may be one or more. If there are multiple battery cells 100, the multiple battery cells 100 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 100. The plurality of battery cells 100 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 100 is accommodated in the box 102; of course, a plurality of battery units 100 may be connected in series or parallel or series-parallel to form the battery module 101, and then the plurality of battery modules 101 may be connected in series or parallel or series-parallel to form a whole and be accommodated in the case 102.

Fig. 3 is a schematic diagram of a battery module 101 according to some embodiments of the present application.

In some embodiments, the battery module 101 includes a plurality of battery cells 100, and the plurality of battery cells 100 are connected in series, in parallel, or in series-parallel to form the battery module 101. The plurality of battery modules 101 are then connected in series or parallel or a series-parallel combination to form a unit and are accommodated in the case 102. The plurality of battery cells 100 in the battery module 101 may be electrically connected through a bus member, so as to realize parallel connection, serial connection or series-parallel connection of the plurality of battery cells 100 in the battery module 101.

Fig. 4 is a schematic diagram of a battery cell 100 according to some embodiments of the present application.

As shown in fig. 4 and 5, the battery cell 100 includes a battery cell 3, a housing 1 and a top cover 2, an opening 10a is formed at one end of the accommodating cavity 10 far away from the bottom plate 11, the top cover 2 covers the opening 10a, the top cover 2 is fixedly connected with the side plate 12, and the battery cell 3 is arranged in the accommodating cavity 10.

It can be seen that the housing 1 is of hollow construction, the interior of which forms a receiving chamber 10 for receiving the battery cell 3 and the electrolyte. The housing 1 may be of various shapes, such as a rectangular parallelepiped, a hexagonal prism, or the like. The shape of the housing 1 may be determined according to the specific shape of the battery cell 3. For example, if the battery cell 3 has a rectangular parallelepiped structure, the rectangular parallelepiped housing 1 may be selected. Wherein, the top cover 2 is connected with the shell 1 in a sealing way to form a sealing space for accommodating the battery cell 3 and electrolyte; the cover 2 is connected to the housing 1, for example, by welding.

The battery cell 3 is a core component for realizing the charge and discharge functions of the battery cell 100, the battery cell 3 can be one or more, the application is not particularly limited, the battery cell 3 comprises a first pole piece, a second pole piece and a separator, the polarities of the first pole piece and the second pole piece are opposite, and the separator is used for insulating and isolating the first pole piece and the second pole piece. The battery cell 3 mainly depends on metal ions to move between a first pole piece and a second pole piece, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece. Wherein, the first pole piece can be one or more, and the second pole piece can be one or more; the number of the first and second electrode sheets may be determined according to the structure of the electrode assembly 10.

In some embodiments, the cells 3 may be wound cells, laminated cells, or other forms of structure.

When the battery cell 3 is a laminated battery cell, the battery cell 3 may include a plurality of laminated negative electrode sheets and a plurality of laminated positive electrode sheets, the plurality of negative electrode sheets are identical in composition and size (length×width×thickness), and the plurality of positive electrode sheets are also identical in composition and size (length×width×thickness). Thus, the total length L1 of the negative current collector in the present application is the sum of the lengths of the negative current collectors in a plurality of negative electrode plates (i.e., the product of the length of the negative current collector in a certain negative electrode plate and the number of negative electrode plates), and the total length L2 of the positive current collector in the present application is the sum of the lengths of the positive current collectors in a plurality of positive electrode plates (i.e., the product of the length of the positive current collector in a certain positive electrode plate and the number of positive electrode plates). Since several negative electrode tabs have the same size (length×width×thickness), the width and thickness of the negative electrode current collector of the present application are consistent with those of a negative electrode current collector in one of the negative electrode tabs. Also, since the plurality of positive electrode tabs all have the same size (length×width×thickness), the width and thickness of the positive electrode current collector of the present application are kept identical to those of the positive electrode current collector in one of the positive electrode tabs.

When the battery cell 3 is a winding type battery cell, the negative electrode lugs can be uniformly distributed on the negative electrode plate, and the positive electrode lugs can be uniformly distributed on the positive electrode plate.

In some embodiments, the battery cell 100 further includes two electrode terminals mounted to the top cover 2, and the two electrode terminals are respectively electrically connected to the first electrode tab and the second electrode tab, so as to conduct out the electric energy generated by the electric core 3.

In some embodiments, the cell 3 includes a body portion 31 and a tab 32 connected to the body portion 31. The main body 31 is an electricity generating portion of the battery cell 3, and an active material therein is used to electrochemically react with an electrolyte or the like to generate a charge-discharge process. The tab 32 is led out from an end of the main body 31 and is connected to an electrode terminal to conduct out electric energy generated in the main body 31.

The main body portion 31 includes a positive electrode current collecting portion, a positive electrode active material layer, a negative electrode current collecting portion, a negative electrode active material layer, and a separator, and the tab 32 includes a positive electrode tab and a negative electrode tab.

Next, the structure of the housing 1 provided in some embodiments of the present application is described with reference to the drawings.

As shown in fig. 6 and 7 a-7 k, the housing 1 includes a bottom plate 11, a side plate 12 and a transition fillet 13, the side plate 12 is connected to an outer edge of the bottom plate 11, the transition fillet 13 is connected between the bottom plate 11 and the side plate 12 in a transition manner, and the transition fillet 13, the side plate 12 and the bottom plate 11 define a receiving cavity 10, and the receiving cavity 10 is used for receiving the battery cell 3.

As shown in fig. 7a to 7k, the bottom plate 11 has a first inner wall surface 11a facing the accommodating chamber 10, at least part of the first inner wall surface 11a is for supporting the battery cell 3, the first inner wall surface 11a includes a first surface 11b and a second surface 11c, the second surface 11c is provided on the outer peripheral side of the first surface 11b, the side plate 12 has a second inner wall surface 12a facing the accommodating chamber 10, the transition rounded corner 13 has a third inner wall surface 13a facing the accommodating chamber 10, and the third inner wall surface 13a connects the second surface 11c and the second inner wall surface 12a.

Wherein, at least one of the second surface 11c and the third inner wall surface 13a is formed with an avoiding groove 1a, the avoiding groove 1a is configured to avoid the corner part of the battery core 3, the corner part of the battery core 3 is the corner part corresponding to the transition round angle 13, the avoiding groove 1a extends along the length direction of the transition round angle 13, when the battery core 3 is arranged on the bottom plate 11, the corner part of the battery core 3 cannot interfere with the second surface 11c and the third inner wall surface 13a, and the corner part of the battery core 3 cannot be crushed by the second surface 11c and the third inner wall surface 13a to cause decarburization so as to reduce the capacity of the battery core 3, facilitate short circuit and the like, thereby ensuring the use reliability and safety of the battery core 3. The corner portions of the battery cell 3 can be understood as portions of adjacent two surfaces of the battery cell 3 and the two surfaces that meet.

For example, when the second surface 11c is formed with the escape recess 1a, the second surface 11c is concavely provided with respect to at least one of the first surface 11b and the third inner wall surface 13 a; when the third inner wall surface 13a is formed with the escape groove 1a, the third inner wall surface 13a is concavely provided with respect to at least one of the second surface 11c and the second inner wall surface 12 a; when the second surface 11c and the third inner wall surface 13a are each formed with the escape recess 1a, the second surface 11c is concavely disposed with respect to the first surface 11b, and the third inner wall surface 13a is concavely disposed with respect to the second inner wall surface 12 a.

It can be seen that when the housing 1 is used for the battery 200, the battery core 3 can be directly arranged on the bottom plate 11, so that the corner portion of the battery core 3 can be ensured not to be crushed, and then, compared with some technologies, the bottom plate is arranged in the accommodating cavity so as to place the battery core on standing by a standing position by utilizing the bottom plate, thereby avoiding crushing the edge of the battery core, the application does not need to separately arrange the bottom plate, and the assembly process and the installation cost of the bottom plate are saved (for example, the bottom plate is connected to the bottom of the insulating film wrapped around the battery core in a hot-melt manner, in the related technologies, the battery core is accommodated in the bag-shaped insulating film so as to ensure that the battery core is insulated from the housing, and the bottom plate is fixed on the bottom surface of the bag-shaped insulating film in a hot-melt manner.

It will be appreciated that the first surface 11b and the second surface 11c may be directly connected, or the first surface 11b and the second surface 11c may be spaced apart and the first surface 11b and the second surface 11c may be indirectly connected through other portions of the first inner wall surface 11a

For example, the housing 1 includes a plurality of side plates 12, the plurality of side plates 12 are disposed around the bottom plate 11, and each side plate 12 and the bottom plate 11 have a transition rounded corner 13 therebetween, and at least one of the corresponding second surface 11c and the corresponding third inner wall surface 13a of at least one of the plurality of side plates 12 is formed with the escape recess 1a. In the example of fig. 4, four side plates 12 are respectively a front side plate, a rear side plate, a left side plate and a right side plate, at least one of a second surface 11c corresponding to the front side plate and a third inner wall surface 13a corresponding to the front side plate is formed with a relief groove 1a, and/or at least one of a second surface 11c corresponding to the rear side plate and a third inner wall surface 13a corresponding to the rear side plate is formed with a relief groove 1a, and/or at least one of a second surface 11c corresponding to the left side plate and a third inner wall surface 13a corresponding to the left side plate is formed with a relief groove 1a, and/or at least one of a second surface 11c corresponding to the right side plate and a third inner wall surface 13a corresponding to the right side plate is formed with a relief groove 1a.

It should be noted that, in the description of the present application, the terms "front," "rear," "left," "right," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. For example, for the front side plate described above, the front side plate may be located at the front side, the rear side, the upper side, the lower side, the left side, the right side, or the like of the battery 200 when the battery 200 is in use.

According to the housing 1 of the battery cell 100 in the embodiment of the application, the avoidance groove 1a is formed by setting at least one of the second surface 11b of the bottom plate 11 and the third inner wall surface 13a of the transition fillet 13, so that the distance between the battery cell 3 and the inner wall surface of the housing 1 is increased, and a proper interval is formed between the corner part of the battery cell 3 and the inner wall surface of the housing 1, so that the situation that the corner part of the battery cell 3 is crushed by the transition fillet 13, the battery cell 3 is decarburized, the capacity of the battery cell 3 is reduced, and the battery cell 3 is easy to short circuit is avoided; therefore, the battery cell 3 is standing on top of the standing on top of a standing position by a certain height is not required to be arranged on the shell 1, so that the assembly process and the fixing process of the bottom support plate are saved, the installation cost of the bottom support plate, such as the hot melting cost for fixedly arranging the bottom support plate on the shell 1, is reduced, the number of parts of the battery cell 100 is reduced, the structure of the battery cell 100 is simplified, and the assembly efficiency and the production efficiency of the battery cell 100 are improved.

It can be appreciated that the depth of the avoidance groove 1a and the cross-sectional shape of the avoidance groove 1a can be specifically set according to actual requirements; for example, in the examples of fig. 7a to 7k, the wall surface of the relief groove 1a may be a flat surface or a curved surface.

In some embodiments, as shown in fig. 7a to 7d, the housing 1 has a first reference arc-shaped curved surface R1 and a reference plane R2, the first reference arc-shaped curved surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is concavely disposed with respect to the first reference arc-shaped curved surface R1, so that the third inner wall surface 13a is formed with the avoidance groove 1a, and at this time, the third inner wall surface 13a is concavely disposed with respect to the second inner wall surface 12 a. Therefore, on the premise of ensuring that the corner part of the battery cell 3 is not interfered with the bottom plate 11 and the transition fillet 13, the avoidance groove 1a is simple in structure and convenient to process.

In some embodiments, as shown in fig. 7a, the first surface 11b and the second surface 11c are all arranged coplanar with the reference plane R2, that is, the first surface 11b and the second surface 11c are both located on the reference plane R2, at this time, the second surface 11c does not need to process to avoid the groove 1a, and can avoid the corner of the battery core 3 only through the avoiding groove 1a on the third inner wall surface 13a, so that the processing procedure of the casing 1 is saved, the cost is reduced, and meanwhile, the battery core 3 can be directly arranged on the first surface 11b and the second surface 11c, which is beneficial to ensuring the utilization rate of the accommodating cavity 10 and ensuring the energy density of the battery 200.

Of course, in other embodiments of the present application, as shown in fig. 7 b-7 d, at least one of the first surface 11b and the second surface 11c protrudes from the reference plane R2 to form the supporting protrusion 111, a portion of the base plate 11 protruding from the reference plane R2 may form the supporting protrusion 111, the supporting protrusion 111 is a portion of the base plate 11, or the supporting protrusion 111 is integrally formed on the main body of the base plate 11, and the supporting protrusion 111 may stand on the battery cell 3 at a certain height, so that the corner portion of the battery cell 3 is further far away from the transition rounded corner 13, so as to achieve the effect of protecting the battery cell 3, at this time, the battery cell 3 may be directly disposed on the supporting protrusion 111, or the battery cell 3 may be directly disposed on the above one of the first surface 11b and the second surface 11 c. Thus, the first surface 11b and the second surface 11c are flexibly arranged, so that the housing 1 can meet the different requirements of different battery cells 100.

For example, in the example of fig. 7b, the third inner wall surface 13a is concavely disposed with respect to the first reference arc-shaped curved surface R1, and the first surface 11b and the second surface 11c are both disposed to protrude from the reference plane R2, so that the portions of the bottom plate 11 corresponding to the first surface 11b and the second surface 11c protruding from the reference plane R2 form the supporting protrusions 111, and at this time, on the plane of the bottom plate 11, the supporting protrusions 111 are in contact with the third inner wall surface 13a to be directly connected; for another example, in the example of fig. 7c, the third inner wall surface 13a is concavely disposed with respect to the first reference arc-shaped curved surface R1, the first surface 11b is disposed coplanar with the reference plane R2, and the second surface 11c is disposed protruding from the reference plane R2, such that the portion of the bottom plate 11 corresponding to the second surface 11c protruding from the reference plane R2 forms the supporting protrusion 111, and at this time, on the plane of the bottom plate 11, the supporting protrusion 111 contacts with the third inner wall surface 13a to be directly connected; for another example, in the example of fig. 7d, the third inner wall surface 13a is concavely disposed with respect to the first reference arc-shaped curved surface R1, the second surface 11c is disposed coplanar with the reference plane R2, and the first surface 11b is disposed protruding from the reference plane R2, so that the portion of the bottom plate 11 corresponding to the first surface 11b protruding from the reference plane R2 forms the supporting protrusion 111, and at this time, on the plane of the bottom plate 11, the supporting protrusion 111 is disposed spaced apart from the third inner wall surface 13 a.

In some embodiments, as shown in fig. 7e and fig. 7f, the casing 1 has a first reference curved arc surface R1 and a reference plane R2, the first reference curved arc surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, the second surface 11c is concavely disposed relative to the reference plane R2, so that the second surface 11c is formed with a recess 1a, the first surface 11b protrudes from the reference plane R2 to form a supporting protrusion 111, and then the supporting protrusion 111 may stand on the battery cell 3 by a certain height, so that the corner portion of the battery cell 3 is further far away from the transition fillet 13 and the second surface 11c, so as to avoid interference between the connection position of the second surface 11c and the third inner wall surface 13a and the corner portion of the battery cell 3, so as to achieve the effect of protecting the battery cell 3, and at this time, the battery cell 3 may be directly disposed on the first surface 11b, and on the plane where the bottom plate 11 is located, the supporting protrusion 111 contacts with the third inner wall surface 13a to be directly connected.

It will be appreciated that, when the second surface 11c is disposed concavely with respect to the reference plane R2 and the first surface 11b is disposed convexly with respect to the reference plane R2, the third inner wall surface 13a is disposed in such a manner that: as shown in fig. 7e, the third inner wall surface 13a may be tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a may be formed as an arc-shaped curved surface; alternatively, as shown in fig. 7f, the third inner wall surface 13a is concavely disposed with respect to the first reference curved arc surface R1 such that the third inner wall surface 13a is formed with the escape groove 1a, and at this time, the depth of the escape groove 1a of the second surface 11c may be equal to or different from the depth of the escape groove 1a of the third inner wall surface 13 a.

In some embodiments, as shown in fig. 7 g-7 k, the housing 1 has a reference plane R2, and the curved surface (e.g., the first reference curved surface R1) on which the third inner wall surface 13a is located is tangent to the second inner wall surface 12a and the reference plane R2, respectively; at least one of the first surface 11b and the second surface 11c protrudes from the reference plane R2 to form a supporting protrusion 111, and then the supporting protrusion 111 can stand on the battery cell 3 at a certain height, so that the corner part of the battery cell 3 is further far away from the transition fillet 13 and the second surface 11c, interference between the connection position of the second surface 11c and the third inner wall surface 13a and the corner part of the battery cell 3 is avoided, so that the effect of protecting the battery cell 3 is achieved, and the battery cell 3 can be directly arranged on the at least one of the first surface 11b and the second surface 11 c.

For example, in the example of fig. 7g, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface, the first surface 11b and the second surface 11c are both provided to protrude from the reference plane R2, so that the portion of the bottom plate 11 corresponding to the first surface 11b and the second surface 11c protruding from the reference plane R2 forms the supporting protrusion 111, at which time the third inner wall surface 13a is concavely provided with respect to the second surface 11c, so that the third inner wall surface 13a is formed with the escape groove 1a, and on the plane of the bottom plate 11, the supporting protrusion 111 is in contact with the third inner wall surface 13a to be directly connected; for another example, in the example of fig. 7h, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface, the first surface 11b is disposed coplanar with the reference plane R2, the second surface 11c is disposed protruding from the reference plane R2, such that the portion of the bottom plate 11 corresponding to the second surface 11c protruding from the reference plane R2 forms the supporting protrusion 111, at this time, the third inner wall surface 13a is disposed concavely with respect to the second surface 11c, such that the third inner wall surface 13a is formed with the avoiding groove 1a, and the supporting protrusion 111 is in contact with the third inner wall surface 13a on the plane of the bottom plate 11 to be directly connected; for another example, in the example of fig. 7i, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface, the second surface 11c is disposed coplanar with the reference plane R2, the first surface 11b is disposed protruding from the reference plane R2, such that the portion of the bottom plate 11 corresponding to the first surface 11b protruding from the reference plane R2 forms the supporting protrusion 111, at this time, the second surface 11c is disposed concavely with respect to the first surface 11b, such that the second surface 11c is formed with the avoiding groove 1a, and on the plane of the bottom plate 11, the supporting protrusion 111 is disposed at a distance from the third inner wall surface 13 a.

In some embodiments, as shown in fig. 7j and fig. 7k, two circumferential ends of the curved surface where the third inner wall surface 13a is located are a first end R11 and a second end R12, where the first end R11 is connected with the second inner wall surface 12a, the second end R12 is far away from the second inner wall surface 12a, and the second end R12 is connected with the reference plane R2, the second surface 11c protrudes out of the reference plane R2, the supporting protrusion 111 extends between the first end R11 and the second end R12, at this time, on the plane where the bottom plate 11 is located, the supporting protrusion 111 contacts with the third inner wall surface 13a to be directly connected, and the supporting protrusion 111 is connected between two circumferential ends of the first reference curved surface R1, so that the corner portion of the battery cell 3 can be set away from the housing 1, and the battery cell 3 can be directly set on the second surface 11c, while the structural strength of the bottom plate 11 is convenient to be ensured.

It will be appreciated that when the support protrusion 111 extends between the first end R11 and the second end R12, the first surface 11b is flush with the reference plane R2 (as shown in fig. 7 j), or the first surface 11b protrudes from the reference plane R2 to be flush with the second surface 11c (as shown in fig. 7 k) or not.

In the description of the present application, the first surface 11b is disposed coplanar with the reference plane R2, which may be understood that the first surface 11b is formed as a part of the reference plane R2, and the second surface 11c is disposed coplanar with the reference plane R2, which may be understood that the second surface 11c is formed as a part of the reference plane R2. It can be seen that the "first reference curved surface R1", "reference plane R2", and "second reference curved surface R3" described later in this application are not the actual surfaces of the case 1, but are merely used as auxiliary reference surfaces to define the actual surfaces of the case 1 and the actual surfaces of the cells 3.

In some embodiments, the projection area of the supporting protrusion 111 along the thickness direction of the bottom plate 11 is s1, the projection area of the bottom plate 11 along the thickness direction is s, and s1/s is 0.1 is less than or equal to 0.9, so that the surface area of the supporting protrusion 111 for supporting the battery core 3 can be flexibly set according to actual requirements, so that the supporting protrusion 111 can be conveniently designed in a diversified shape on the premise of ensuring that the battery core 3 is reliably arranged, and the supporting protrusion 111 and the bottom surface of the battery core 3 can be conveniently provided with a proper stopping area, so that the infiltration effect of electrolyte on the bottom of the battery core 3 is ensured.

Alternatively, s1/s may be 0.1, or 0.2, or 0.3, or 0.4, or 0.5, or 0.6, or 0.7, or 0.8, or 0.9, etc.

In some embodiments, as shown in fig. 7 a-7 k, the height of the supporting protrusion 111 protruding from the reference plane R2 is h, where h is 0.1 mm.ltoreq.h.ltoreq.2.0 mm, so as to ensure that the supporting protrusion 111 stands on the side of the battery cell 3 at a proper height position, thereby ensuring that a certain distance exists between the corner part of the battery cell 3 and the inner wall of the casing 1, so that the corner part of the battery cell 3 does not interfere with the inner wall of the casing 1.

For example, h may be greater than or equal to the radius of the first reference arc; of course, h may be suitably smaller than the radius of the first reference arc.

Alternatively, h may be 0.1mm, or 0.5mm, or 0.8mm, or 1mm, or 1.3mm, or 1.5mm, or 1.8mm, or 2mm.

In some embodiments, as shown in fig. 11a to 11g, the supporting protrusion 111 includes at least one protruding rib 1111, and the protruding rib 1111 extends in a long shape along a straight line or a curved line, so that the protruding rib 1111 is flexibly disposed, and the supporting area of the supporting protrusion 111 is conveniently adjusted by adjusting at least one of the top surface area of the protruding rib 1111 and the number of the protruding ribs 1111, etc., to ensure stable arrangement of the battery cells 3.

It is understood that the length, width, cross-sectional shape, etc. of the ribs 1111 may be specifically set according to actual needs.

In some embodiments, as shown in fig. 11 a-11 c, the ribs 1111 are plural, and the plural ribs 1111 include at least one first rib 1111a and at least one second rib 1111b, the first rib 1111a extends in a long shape along a first direction, the second rib 1111b extends in a long shape along a second direction, and the first direction and the second direction are not parallel if the first direction and the second direction intersect, so as to ensure stable support of the battery cell 3 by the plural ribs 1111.

Of course, in other embodiments of the present application, the extending directions of the plurality of ribs 1111 may also be the same, so that the plurality of ribs 1111 are disposed in parallel.

In some embodiments, as shown in fig. 11b and 11c, the first and

second ribs

1111a and 1111b are disposed to intersect, so as to secure the support stability of the support protrusion 111. Alternatively, in the examples of fig. 11b and 11c, the first ribs 1111a and the second ribs 1111b vertically intersect, and the number of the first ribs 1111a and the number of the second ribs 1111b may be equal or unequal. Of course, the intersecting angle of the first rib 1111a and the second rib 1111b may also be an acute angle. In other embodiments of the present application, as shown in fig. 11a, the first ribs 1111a and the second ribs 1111b may also be disposed apart.

In some embodiments, as shown in fig. 11d, the rib 1111 includes a third rib 1111c, and the third rib 1111c extends in a ring shape along the circumferential direction of the base plate 11, so as to ensure stable support of the cell 3 by the third rib 1111 c.

It should be noted that "annular" as used herein is to be understood in a broad sense, that is, not limited to "annular", but may also be "polygonal ring", for example; also, the "ring shape" defines the extending trend of the third bead 1111c, and the third bead 1111c may extend continuously or intermittently. Further, "annular" also includes an open 10a annular shape (e.g., a C-shaped structure, etc.) and a closed annular shape.

It is understood that the third ribs 1111c may be one or more; when the third ribs 1111c are plural, the arrangement of the plural third ribs 1111c may be specifically set according to actual requirements.

In some embodiments, the number of the third ribs 1111c is plural, and the plurality of third ribs 1111c are coaxially disposed, that is, central axes of a plurality of annular structures corresponding to the plurality of third ribs 1111c coincide, and at this time, one of the two adjacent third ribs 1111c is sleeved on the radial outer side of the other third rib 1111c, so as to further ensure stable support of the battery cell 3.

Of course, the arrangement of the plurality of third beads 1111c may be also set as follows: the entire annular structures corresponding to the plurality of third ribs 1111c are sequentially arranged along the preset direction as shown in fig. 11 f.

In some embodiments, the plurality of ribs 1111 includes a first rib 1111a, a second rib 1111b, and a third rib 1111c.

In some embodiments, the ribs 1111 extend continuously (as shown in fig. 11a, 11b and 11 d) or intermittently (as shown in fig. 11c and 11 e) to facilitate further flexible adjustment of the support area of the support protrusions 111.

In some embodiments, the supporting protrusions 111 are formed as solid protrusions, and the supporting protrusions 111 are formed as circular structures, or elliptical structures, or polygonal structures (as shown in fig. 11 g), etc., so as to ensure stable support of the battery cells 3 by the supporting protrusions 111.

In some embodiments, as shown in fig. 7 a-7 k, at least one of the first surface 11b and the second surface 11c is configured to abut the cell 3, at least one of the first surface 11b and the second surface 11c is adapted to directly contact the cell 3 or indirectly abut through other components (e.g., the insulating film 4 of the surface of the cell 3),

in some embodiments, as shown in fig. 12, at least one of the first surface 11b and the second surface 11c is formed with a containing groove 11d for containing electrolyte, when the cell 3 is disposed on the upper side of the one of the first surface 11b and the second surface 11c, at least a wall surface of the containing groove 11d is disposed spaced apart from the cell 3, and the electrolyte is contained in the containing groove 11d, so that the electrolyte in the containing groove 11d can infiltrate the bottom of the cell 3, and the infiltration effect of the cell 3 is ensured.

It can be appreciated that the depth, shape, number, arrangement and the like of the accommodating grooves 11d can be specifically set according to actual requirements, so as to ensure the wetting effect of the electrolyte on the bottom of the battery cell 3.

In some embodiments, as shown in fig. 12, at least one of the first surface 11b and the second surface 11c is configured to abut against the cell 3, at least one of the first surface 11b and the second surface 11c is formed with a receiving groove 11d for receiving an electrolyte, and at least one of the first surface 11b and the second surface 11c is adapted to directly contact with the cell 3 or indirectly abut against by other components (e.g., an insulating film 4 on a surface of the cell 3), so that the at least one of the first surface 11b and the second surface 11c applies a certain supporting force to the cell 3 to ensure stable placement of the cell 3, and when the cell 3 is placed on the at least one of the first surface 11b and the second surface 11c, a wall surface of the receiving groove 11d is disposed apart from the cell 3, and the electrolyte is received in the receiving groove 11d, so that the electrolyte in the receiving groove 11d can infiltrate the bottom of the cell 3, ensuring the infiltration effect of the cell 3.

For example, in the examples of fig. 4 and 12, the insulating film 4 includes a first insulating portion 41 and a second insulating portion 42, the second insulating portion 42 is stopped between the battery cell 3 and the bottom plate 11, and the first insulating portion 41 is provided between the battery cell 3 and the side plate 12. Wherein the insulating film 4 may be a Mylar film.

It will be appreciated that when one of the first surface 11b and the second surface 11c is not in abutment with the cell 3 (fig. 7 c-7 f, 7 h-7 j), then one of the first surface 11b and the second surface 11c is recessed with respect to the other, and then there is a space between the one of the first surface 11b and the second surface 11c and the cell 3, which space also serves to contain electrolyte, so as to guarantee the wetting effect of the bottom of the cell 3.

In some embodiments, as shown in fig. 6 to 9 and 12, the bottom plate 11 has an outer wall surface 11e facing away from the receiving chamber 10, and the outer wall surface 11e is formed in a plane so as to simplify the process of the outer wall surface 11e and facilitate the arrangement of the battery 200.

In some embodiments, as shown in fig. 13 to 18, the housing 1 has a first reference curved arc surface R1 and a reference plane R2, the first reference curved arc surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, respectively, the first surface 11b protrudes from the reference plane R2 to form the supporting protrusion 111, the bottom plate 11 has an outer wall surface 11e facing away from the accommodating cavity 10, the outer wall surface 11e is formed with a first groove 11f, the first groove 11f is disposed opposite to the supporting protrusion 111, and then a portion of the material of the bottom plate 11 corresponding to the supporting protrusion 111 may be at least partially derived from a portion of the material corresponding to the first groove 11f, so as to improve the material utilization rate of the bottom plate 11.

In some embodiments, as shown in FIGS. 14 and 17, the depth of the first groove 11f is t,0 < t.ltoreq.2 mm, so that the bottom plate 11 still has a proper thickness after the first groove 11f is provided; and/or, the height h of the supporting protrusion 111 protruding from the reference plane R2 is equal to the depth t of the first groove 11f, which is also convenient for ensuring that the bottom plate 11 has a proper thickness after the first groove 11f is provided. Alternatively, the depth of the first groove 11f may be 0.1mm, or 0.8mm, or 1mm, or 1.5mm, or 1.7mm, or 2mm, or the like.

In some embodiments, as shown in fig. 20 to 23, the bottom plate 11 has an outer wall surface 11e facing away from the accommodating cavity 10, and the outer wall surface 11e is formed with a reinforcing rib 112 to improve the structural strength of the bottom plate 11, reduce the deformation of the bottom plate 11, and reduce the deformation of the bottom of the housing 1, so as to prevent the bottom of the housing 1 from being degummed at the interface between the bottom of the housing 1 and the pack module due to excessive deformation, and ensure the use safety of the battery 200. Wherein the number of the reinforcing ribs 112 is one or more; when the reinforcing ribs 112 are plural, the arrangement of the reinforcing ribs 112 may be specifically set according to practical applications, for example, the plural reinforcing ribs 112 are arranged at intervals, or at least two of the plural reinforcing ribs 112 are arranged to intersect.

It will be appreciated that when the outer wall surface 11e is formed as a plane, the reinforcing bead 112 may be provided on the plane, and the reinforcing bead 112 protrudes from the plane; when the outer wall surface 11e is formed with the first groove 11f, as shown in fig. 21, the reinforcing bead 112 may be provided on a side wall surface of the first groove 11f facing the accommodating chamber 10 (i.e., a bottom wall of the first groove 11 f), and the reinforcing bead 112 protrudes from the above wall surface of the first groove 11f, so that it is convenient to save the occupied space of the case 1 at this time, so as to improve the space utilization of the battery 200; of course, the reinforcing bead 112 may also be provided outside the first groove 11 f.

In some embodiments, as shown in fig. 23, the stiffener 112 is elongated, facilitating placement of the stiffener 112.

It is understood that when the outer wall surface 11e is formed with the first groove 11f, the length of the reinforcing bead 112 may be less than or equal to the length of the first groove 11 f.

Of course, in other embodiments, the extending direction of the reinforcing ribs 112 intersects the length direction of the bottom plate 11 at a non-zero angle, and then the extending direction of the reinforcing ribs 112 intersects the length direction of the bottom plate 11 at an acute angle or at a right angle (e.g., the extending direction of the reinforcing ribs 112 is the width direction of the bottom plate 11). For example, in the example of fig. 22, the reinforcing bead 112 extends in the width direction of the bottom plate 11; at this time, if the outer wall surface 11e is formed with the first groove 11f, the length of the reinforcing bead 112 may be less than or equal to the width of the first groove 11 f.

It should be noted that the reinforcing ribs 112 may extend in a straight line or a curved line.

In some embodiments, as shown in fig. 21, the height h1 of the reinforcing rib 112 is less than or equal to the depth t of the first groove 11f, and the reinforcing rib 112 is not protruding from the outer wall surface 11e, so as to save the space occupied by the housing 1.

In some embodiments, as shown in fig. 21, the first inner wall surface 11a is further formed with a second groove 11g, and the second groove 11g is disposed opposite to the reinforcing rib 112 along the thickness direction of the base plate 11, so that a portion of the material of the base plate 11 corresponding to the reinforcing rib 112 may be at least partially derived from a portion of the material corresponding to the second groove 11g, so as to improve the material utilization rate of the base plate 11. Of course, the first inner wall surface 11a may not be formed with the second groove 11g.

In some embodiments, as shown in fig. 5-23, the base plate 11 is a unitary stamping, facilitating the forming of the base plate 11.

For example, the first inner wall surface 11a has the supporting projection 111, the outer wall surface 11e of the base plate 11 is formed with the first groove 11f, the first groove 11f is disposed opposite to the supporting projection 111, and at this time the first groove 11f and the supporting projection 111 may be simultaneously formed by a punching process, that is, a punching apparatus is punched in alignment with the disposed position of the first groove 11f to simultaneously form the first groove 11f and the supporting projection 111.

For another example, the first inner wall surface 11a is formed with the second groove 11g, the outer wall surface 11e is formed with the reinforcing bead 112, the second groove 11g is disposed opposite to the reinforcing bead 112, and at this time the second groove 11g and the reinforcing bead 112 may be simultaneously formed by a pressing process, that is, a pressing device is pressed in alignment with the disposed position of the second groove 11g to simultaneously form the second groove 11g and the reinforcing bead 112.

In some embodiments, as shown in fig. 24 a-24 j, the battery cell 100 further includes a battery cell 3, where the battery cell 3 is accommodated in the accommodating cavity 10 of the housing 1, and the battery cell 3 has a bottom wall 311, a side wall 312, and a connecting wall 313, where the connecting wall 313 connects the bottom wall 311 and the side wall 312, and the connecting wall 313 extends along the length direction of the transition fillet 13; the battery cell 3 is further provided with a second reference arc-shaped curved surface R3, the second reference arc-shaped curved surface R3 is tangent to the bottom wall 311 and the side wall 312 respectively, the connecting wall 313 is located on the radial inner side of the second reference arc-shaped curved surface R3, the connecting wall 313 is in double fit with the housing 1 to avoid the groove 1a, the distance between the corner part of the battery cell 3 and the inner wall surface of the housing 1 is further improved, the corner part of the battery cell 3 is prevented from being crushed by the inner wall surface of the housing 1, and the use reliability and safety of the battery cell 3 are further improved.

It will be appreciated that the size of the connecting wall 313 may be adapted according to the radius of the second reference curved arc surface R3. For example, in the example of fig. 24 a-24 j, the connecting wall 313 has a third end connected to the bottom wall 311 and a fourth end connected to the side wall 312, the second reference curved arc surface R3 is tangential to the bottom wall 311 at a first predetermined position, the second reference curved arc surface R3 is tangential to the side wall 312 at a second predetermined position, the third end is located at the first predetermined position or at a side of the first predetermined position remote from the second reference curved arc surface R3, and the fourth end is located at the second predetermined position or at a side of the second predetermined position remote from the second reference curved arc surface R3.

Alternatively, the battery cell 3 having the above-described connection wall 313 may be a laminated battery cell, but is not limited thereto.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A housing for accommodating a battery cell, the housing comprising a bottom plate, side plates and transition fillets, the side plates being connected to the outer edges of the bottom plate, the transition fillets being in transitional connection between the bottom plate and the side plates, and the transition fillets, the side plates and the bottom plate defining an accommodating cavity for accommodating the battery cell,

The bottom plate is provided with a first inner wall surface facing the accommodating cavity, the first inner wall surface comprises a first surface and a second surface, the second surface is arranged on the outer periphery side of the first surface, the side plate is provided with a second inner wall surface facing the accommodating cavity, the transition fillet is provided with a third inner wall surface facing the accommodating cavity, the third inner wall surface is connected with the second surface and the second inner wall surface,

at least one of the second surface and the third inner wall surface is provided with an avoidance groove, and the avoidance groove is configured to avoid the corner part of the battery cell.

2. The housing of claim 1, wherein the housing has a first reference arcuate surface and a reference plane, the first reference arcuate surface being tangent to the second inner wall surface and the reference plane, respectively,

the third inner wall surface is concavely arranged relative to the first reference arc-shaped curved surface, so that the avoidance groove is formed on the third inner wall surface.

3. The housing of claim 2, wherein the housing is configured to receive the cartridge,

the first surface and the second surface are arranged coplanar with the reference plane; or alternatively, the process may be performed,

at least one of the first surface and the second surface is provided protruding from the reference plane to form a supporting protrusion.

4. The housing of claim 1, wherein the housing has a first reference arcuate surface and a reference plane, the first reference arcuate surface being tangent to the second inner wall surface and the reference plane, respectively,

the second surface is concavely arranged relative to the reference plane, so that the avoidance groove is formed on the second surface, and the first surface protrudes out of the reference plane to form a supporting protrusion.

5. The housing of claim 1, wherein the housing has a reference plane, the curved surface of the third inner wall surface is tangent to the second inner wall surface and the reference plane, and at least one of the first surface and the second surface protrudes from the reference plane to form a supporting protrusion.

6. The housing of claim 5, wherein the third inner wall surface has a curved arcuate surface with a first end and a second end at each of two ends in a circumferential direction, the first end being connected to the second inner wall surface, the second end being connected to the reference plane, the second surface protruding from the reference plane, and the support protrusion extending between the first end and the second end.

7. A housing according to claim 3, wherein at least one of the first surface and the second surface is provided protruding from the reference plane to form a supporting projection, a projected area of the supporting projection on a plane perpendicular to the thickness direction of the base plate is s1, and a projected area of the base plate on a plane perpendicular to the thickness direction of the base plate is s, 0.1.ltoreq.s1/s.ltoreq.0.9.

8. A housing according to claim 3, wherein at least one of the first surface and the second surface is arranged to protrude from the reference plane to form a supporting protrusion, the supporting protrusion protruding from the reference plane by a height h of 0.1 mm.ltoreq.h.ltoreq.2.0 mm.

9. A housing according to claim 3, wherein at least one of the first and second surfaces is raised from the datum plane to form a support protrusion comprising at least one ridge extending in a straight or curved line.

10. The housing of claim 9, wherein the ribs are a plurality, the plurality of ribs comprising at least one first rib and at least one second rib, the first rib extending in a first direction as an elongated shape, the second rib extending in a second direction as an elongated shape, the first direction intersecting the second direction.

11. The housing of claim 9, wherein the bead comprises a third bead that extends in a circumferential direction of the base plate in a ring shape.

12. The housing of claim 11, wherein the third ribs are a plurality of and the plurality of third ribs are coaxially disposed.

13. The housing of claim 9, wherein the ribs extend continuously or intermittently.

14. A housing according to claim 3, wherein at least one of the first surface and the second surface is provided protruding from the reference plane to form a support protrusion, the support protrusion being formed as a solid protrusion, and the support protrusion being formed as a circular structure, an elliptical structure, or a polygonal structure.

15. The housing of any one of claims 1-14, wherein at least one of the first surface and the second surface is configured to abut a battery cell; and/or at least one of the first surface and the second surface is formed with a receiving groove for receiving an electrolyte.

16. The housing according to any one of claims 1 to 14, wherein the bottom plate has an outer wall surface facing away from the accommodation chamber, the outer wall surface being planar.

17. The housing of any one of claims 1-14, wherein the housing has a first reference arcuate surface and a reference plane, the first reference arcuate surface being tangent to the second inner wall surface and the reference plane, respectively, the first surface protruding from the reference plane to form a support protrusion, the base plate having an outer wall surface facing away from the receiving cavity, the outer wall surface being formed with a first recess, the first recess being disposed opposite the support protrusion.

18. The housing of claim 17, wherein the housing is configured to receive the fluid,

the depth of the first groove is t, and t is more than 0 and less than or equal to 2mm; and/or the number of the groups of groups,

the height of the supporting protrusion protruding out of the reference plane is equal to the depth of the first groove.

19. The housing according to any one of claims 1 to 14, wherein the bottom plate has an outer wall surface facing away from the receiving chamber, the outer wall surface being formed with at least one reinforcing bead.

20. The housing of claim 19, wherein the stiffener is elongate.

21. The housing of claim 19, wherein the outer wall surface is formed with a first groove, and the reinforcing bead is formed on a bottom wall of the first groove.

22. The housing of claim 21, wherein the height of the stiffener is less than or equal to the depth of the first groove.

23. The housing of claim 21, wherein the first inner wall surface is further formed with a second groove, the second groove being disposed opposite the reinforcing bead in a thickness direction of the bottom plate.

24. The housing of claim 1 wherein the base plate is a unitary stamping.

25. A battery cell comprising the housing of any one of claims 1-24.

26. The battery cell of claim 25, further comprising a cell received in the receiving cavity of the housing, the cell having a bottom wall, a side wall, and a connecting wall connecting the bottom wall and the side wall, the connecting wall extending along a length of the transition fillet, the cell further having a second reference arcuate surface, the second reference arcuate surface being tangent to the bottom wall and the side wall, respectively, the connecting wall being radially inward of the second reference arcuate surface.

27. A battery comprising a plurality of cells according to claim 25 or 26.

28. An electrical device comprising the battery of claim 27 for providing electrical energy.