CN217641553U - Shell for battery, battery monomer, battery and power utilization device - Google Patents

Abstract

The embodiment of the application provides a casing, battery monomer, battery and with electric installation for battery. The shell is applied to a single battery and formed by rolling and folding a plate, and comprises a first connecting part, a second connecting part and a plurality of side walls, wherein the side walls enclose a containing cavity and two openings which are oppositely arranged at two ends of the containing cavity; the first connecting part and the second connecting part form a welding zone through welding; the weld zone is located between the first free end and the second free end; the first connecting part and the second connecting part are arranged in a superposition mode in the thickness direction of the side wall to form a superposition area; the accommodating cavity is used for accommodating an electrode assembly; the two end covers are used for accommodating two openings of the cavity; the shell strength is increased while the thickness of the shell is reduced, an additional space is created in the shell, the process level of manufacturing the battery shell and the product quality of the battery shell are improved, and higher possibility is provided for mass production of batteries with high energy density.

Description

Shell for battery, battery monomer, battery and power utilization device

Technical Field

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

Background

With the development of science and technology, the demand for the yield of new energy batteries is higher and higher. At present, in order to improve the overall energy density of a new energy battery, a plurality of battery cells are arranged in the new energy battery, and the product goodness of the battery is controlled, so that the flatness and the width tolerance of a plurality of combined battery cell shells are subjected to strict requirements. Therefore, how to improve the manufacturing process of the battery cell casing to improve the product yield is an urgent technical problem to be solved in the new energy battery manufacturing technology.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a novel casing, a battery cell including the novel casing, a battery and an electric device, which can improve the manufacturing goodness of the battery case and further improve the production efficiency, and simultaneously improve the space utilization rate inside the battery and further improve the energy density of the battery.

In a first aspect, an embodiment of the present application provides a case for a battery cell, where the case is formed by folding a sheet material, and the case includes a receiving cavity enclosed by the case, where the receiving cavity is used for placing an electrode assembly of the battery cell;

the shell comprises a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are arranged in an overlapped mode and fixedly connected.

In the scheme, the shell is formed by rolling and folding the plate, so that the processing steps are simplified; through the fixed connection setting of first connecting portion and second connecting portion, can effectively strengthen the intensity of casing at the junction that both ends link to each other.

In some embodiments, the first connection portion and the second connection portion are welded and form a welding region, and the welding region is formed at the first connection portion and the second connection portion, respectively.

In the above solution, the welding zones are respectively formed on the first connection portion and the second connection portion, and the welding zones are areas on the surfaces of the first connection portion and the second connection portion generated after welding and can be used for combining and connecting the first connection portion and the second connection portion.

In some embodiments, the first connection portion has a first free end and the second connection portion has a second free end, and the weld zone is located between the first free end and the second free end.

In the above solution, the first free end and the second free end are used for defining the specific position of the welding zone on the shell.

In some embodiments, the minimum circumferential distance of the weld zone from the first free end is L1, the minimum circumferential distance of the weld zone from the second free end is L2, and L1-L2| has a value less than or equal to 5mm.

In the above scheme, the absolute distance between L1 and L2 is used to define the specific distance between the first free end and the second free end and the weld zone.

In some embodiments, the first connection portion is located outside the second connection portion, and the welding region is configured to penetrate through both sides of the first connection portion and not to exceed an inner surface of the second connection portion in a direction in which the first connection portion points to the second connection portion.

In the above aspect, the first connection portion is located outside the second connection portion, and the welding zone is disposed at a position where the first connection portion and the second connection portion intersect with each other, where the welding zone is a region where the first connection portion and the second connection portion are formed by welding, and the welding zone is disposed to penetrate through the first connection portion and point in a direction of the second connection portion, but does not penetrate through an inner surface of the second connection portion, so as to protect the electrode assembly inside the case from being damaged.

In some embodiments, a thickness of the second connection portion is less than or equal to a thickness of the first connection portion.

In the above aspect, the second connection part is a surface closer to the case of the electrode assembly, and when the thickness of the second connection part is less than or equal to the thickness of the first connection part, the welded connection between the first connection part and the second connection part can be more easily completed, while giving a larger space inside the case.

In some embodiments, the first connecting portion and the second connecting portion are overlapped to form an overlapping region, the circumferential size of the welding region is L3, the circumferential size of the overlapping region is L4, and the relationship between the welding region and the overlapping region is 1/4 or more and L4/L3<1.

In the above scheme, in the manufacturing process of the size of the overlapping area, because the first connecting part and the second connecting part are arranged in an overlapping manner, the size of the overlapping area exceeds the thickness of the side of a common shell, namely, L4 is larger than the conventional set size; the size of the welding area is preset with the circumferential size length of L3, so that the welding area can be used for connecting and fixing the first connecting part and the second connecting part; the preset value of the welding zone and the superposition zone is 1/4 which is less than or equal to L4 divided by L3 and less than 1, and the welding zone and the superposition zone which meet the size relation can effectively provide support and strength for the first connecting part and the second connecting part within an error range.

In some embodiments, the shell is made of steel, and the thickness of the shell is less than or equal to 1mm.

In the above scheme, the material of the shell is replaced by the shell made of the steel material by using the aluminum material, so that the shell strength of the shell is improved, and the shell can be more easily rolled and folded in the utility model; the thickness size of each face of casing be no longer than 1mm, through reducing the thickness size of casing itself, increased the inside usage space of casing.

In some embodiments, the housing comprises a plurality of side walls that enclose the receiving cavity;

one of the side walls includes the first connection portion and the second connection portion, and the first connection portion and the second connection portion are arranged in an overlapping manner in a thickness direction of the one side wall.

In above-mentioned scheme, the coiling through the lateral wall face forms the chamber that holds that can hold battery monomer, utilizes the stack setting of first connecting portion and second connecting portion, can fix the casing both ends and strengthen casing link thickness when fixed connection, can prevent that the casing from being pierced through when connecting.

In a second aspect, an embodiment of the present application provides a battery cell, including electrode assembly, end cap and the casing in the above-mentioned embodiment, electrode assembly arranges in the holding cavity of casing, the casing includes two openings that are located the both ends of holding cavity, two the end cap is used for closing two respectively the opening.

In the above solution, the battery cell is composed of an electrode assembly, an end cap, and the case in the above embodiment; the electrode assembly is arranged in a containing cavity formed by enclosing a plurality of side walls of the shell, the shell further comprises two oppositely-arranged openings formed by enclosing a plurality of side walls to form the containing cavity, and the end covers are used for sealing the two openings.

In some embodiments, the electrode assembly includes a main body portion and a tab extending from one end of the main body portion in a thickness direction of the end cap, the main body portion includes a straight portion and a bent portion, and both ends of the straight portion in a length direction are provided with the bent portions;

the shell comprises a plurality of side walls, the side walls surround to form the accommodating cavity, the side walls comprise two first side walls which are oppositely arranged along the thickness direction of the end cover and two second side walls which are oppositely arranged along the length direction of the end cover, the straight parts are parallel to the second side walls and are arranged on the same side or different sides along the length direction of the electrode assembly, and the bending parts are positioned on the same side or different sides in the thickness direction of the electrode assembly; the distance between the bent part and the straight part and the shell in the thickness direction and the length direction are both smaller than or equal to 10mm.

In the above aspect, the electrode assembly is composed of a main body part and a tab, wherein the main body part further includes a straight part and a bent part, and the straight part and the bent part of the main body part define an overall shape of the electrode assembly, so that the electrode assembly can be placed in the case without being attached to a side wall surface of the case;

a plurality of side wall surfaces on the shell can be used for enclosing to form an accommodating cavity in the shell, so that a space is created for placing the electrode assembly; the distance between the bending part and the straight part and the inner wall surface of the shell is less than 10mm; compared with a common shell, the first connecting part and the second connecting part create an additional space for the interior of the shell in a superposition mode, so that the overall length and thickness of the electrode assembly can be increased, and the distance between the bent part and the straight part of the electrode assembly and the surface of the inner wall of the shell is reduced, thereby improving the overall energy density of the battery

In a third aspect, an embodiment of the present application further provides a battery, which includes the battery cell in the foregoing embodiment.

In the above scheme, the casing is used for providing protection and placing functions for the electrode assembly inside the battery cell, and the battery cell is used for providing electric energy for the battery.

In a fourth aspect, embodiments of the present application provide an electric device, which includes the battery mentioned in the above embodiments.

In the above solution, the electric device includes the battery in the above embodiment, and the electric device can provide electric energy to the corresponding equipment.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, some embodiments that need to be used in the embodiments of the present application will be described below, and for those skilled in the art, other drawings may also be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic illustration of a vehicle structure disclosed in some embodiments herein;

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

fig. 3 is a display view of a battery cell disclosed in some embodiments of the present application;

fig. 4 is an exploded view of a battery cell as disclosed in some embodiments of the present application;

FIG. 5 is a side wall surface attachment schematic of the housing disclosed in some embodiments herein;

FIG. 6 is a schematic illustration of a fusion zone disclosed in some embodiments of the present application;

FIG. 7 is a partially enlarged schematic illustration of a front view of a disclosed overlap region in accordance with certain embodiments of the present application;

FIG. 8 is a schematic illustration of a sheet material and shell conversion as disclosed in some embodiments herein;

FIG. 9 is a schematic view of an electrode assembly disclosed in some embodiments of the present application spaced from an inside wall surface of a case;

FIG. 10 is an enlarged schematic view of the electrode assembly disclosed in some embodiments of the present application, spaced from the inside wall surface of the case;

FIG. 11 is an enlarged partial schematic top view of an overlap region as disclosed in some embodiments of the present application.

In the drawings, the figures are not drawn to scale.

The reference numerals in the detailed description are explained as follows:

vehicle-1000; a battery-100; controller-200; a motor-300; 1-a plate material; 2-a second side wall a; 3-a first side wall a; 4-a second side wall b; 5-a first side wall b; 6-an overlap zone; 7-end cap; 8-an electrode assembly; 8 a-a tab; 9-a second connection; 10-a first connection; 11-a first free end; 12-a second free end; 13-a housing; 14-a box body; 15-a first part; 16-a second part; 17-an electrode terminal; 18-a flat portion; 19-bending part; 20-a battery cell; 21-a containing cavity; 22-a fusion zone; l1-first free end minimum distance; l2 — second free end minimum circumferential distance; l3-the circumferential dimension of the welding zone; l4-the circumferential dimension of the overlap zone; x-length direction; y-height direction; z-thickness direction.

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 to implicitly indicate 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 (including two) unless otherwise specifically limited.

Reference herein 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 application. 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 may 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 the association 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 related 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" are used in the technical terms "

Left, right, vertical, horizontal, top, bottom, inner, outer and clockwise "

The references to "counter-clockwise," "axial," "radial," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings and are intended only to facilitate the description of the embodiments and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of 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.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

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

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

With the response of countries in the world to carbon neutralization policies, people have higher and higher demand for new energy; the new energy battery is taken as an important ring in the industry, the process technology is continuously improved, the new energy battery can be more widely applied to daily life, and the application scenes are richer than before; the new energy 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 multiple 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 expanding.

The inventors have noted that there are many means for increasing the energy density of the battery cells constituting the battery, but each means is limited by other factors. For example, if the energy density of the battery cell is increased by increasing the number of electrode assemblies disposed in the battery cell case, the internal space of the battery cell case is insufficient with the current case size of the battery cell; if the energy density of the battery cells is improved by increasing the thickness of the electrode assembly, the electrode assembly may abut against the casing, and after the casings of a plurality of battery cells are connected, the battery expands to easily cause safety problems such as short circuit between adjacent battery cells and the like under the conditions of charging and discharging; if the energy density is increased by increasing the space inside the battery cell case by reducing the thickness of the battery cell case, the case may not satisfy the requirements for strength and rigidity; and the thinner shell may be scratched or even pierced when the battery cells are fixedly connected with each other or the battery cells are fixedly connected with the battery box body, resulting in serious end effects of scrapping the whole battery.

Based on the above consideration, in order to solve the problem of increasing the energy density of the existing electrode assembly in the battery to be insufficient, the applicant has studied to find that in the case where the internal space fails to satisfy the requirement, the problem of changing the space too small from the external space can be addressed; when the thickness of the shell is reduced and the material for manufacturing the shell is changed, a new connection method can be adopted to assemble the battery to expand extra space for the battery.

In view of this, the embodiment of the present application provides a new energy battery with a novel case, which can reduce the thickness of the case and increase the space inside the battery for preventing the electrode assembly by changing the existing case structure and connection manner and replacing the existing material for manufacturing the aluminum case with a material with better hardness, thereby improving the energy density of the battery cell.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric equipment using the battery; the electric equipment provided by the embodiment of the application can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range extending vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not particularly limit the above electric devices.

For convenience of description, the following embodiments are described by taking an electric device of some embodiments of the present application as an example of a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 14 and a battery cell 20, and the battery cell 20 is accommodated in the case 14. The case 14 is used to provide a receiving space for the battery cells 20, and the case 14 may have various structures. In some embodiments, the case 14 may include a first portion 15 and a second portion 16, the first portion 15 and the second portion 16 cover each other, and the first portion 15 and the second portion 16 jointly define a receiving space for receiving the battery cell 20. The second part 16 may be a hollow structure with an open end, the first part 15 may be a plate-shaped structure, and the first part 15 covers the open side of the second part 16, so that the first part 16 and the second part 16 define a receiving space together; the first portion 15 and the second portion 16 may be both hollow structures with one side open, and the open side of the first portion 15 covers the open side of the second portion 16. Of course, the housing 14 formed by the first portion 15 and the second portion 16 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 14; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and the whole is accommodated in the box 14. The battery 100 may also include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is a schematic diagram of a battery cell according to some embodiments of the present disclosure, as shown in fig. 3, a Y direction in the diagram is a height direction, an X direction in the diagram is a length direction, and a Z direction is a thickness direction.

Referring to fig. 4, fig. 4 is an exploded view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes the end cap 7, the case 13, the electrode assembly 8, the tab 8a, the flat portion 18, the bent portion 19, and other functional components.

The end cap 7 refers to a member that covers an opening of the case 13 to insulate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 7 may be adapted to the shape of the housing 13 to fit the housing 13. Alternatively, the end cap 7 may be made of a material (such as steel) having certain hardness and strength; therefore, the end cover 7 is not easy to deform when being extruded and collided, so that the single battery 20 can have higher structural strength, and the safety performance can be improved. The end cap 7 may be provided with functional components such as electrode terminals 17. The electrode terminal 17 may be used to electrically connect with the electrode assembly 8 for outputting or inputting electric energy of the battery cell 20. In some embodiments, the end cap 7 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. In some embodiments, insulation may also be provided on the inside of the end cap 7, which may be used to isolate the electrical connection components within the housing 13 from the end cap 7 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 13 is an assembly for mating with the end cap 7 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 8, electrolyte, and other components. The housing 13 and the end cap 7 may be separate components, and an opening may be provided in the housing 13, and the opening may be covered by the end cap 7 to form the internal environment of the battery cell 20. Without limitation, the end cap 7 and the housing 13 may be integrated, and specifically, the end cap 7 and the housing 13 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 13, the end cap 7 covers the housing 13. The housing 13 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 13 may be determined according to the specific shape and size of the electrode assembly 8.

The electrode assembly 8 is a component of the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 8 may be contained within the housing 13. The electrode assembly 8 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the body portion of the electrode assembly, and the portions of the positive and negative electrode sheets having no active material each constitute a tab 8a. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 8a is connected to the electrode terminal 17 to form a current loop.

According to some embodiments of the present application, referring to fig. 4, with further reference to fig. 4-8, fig. 4-8 are schematic diagrams illustrating different portions of a battery cell 20 of some embodiments of the present application. The battery cell 20 comprises a shell 13 formed by rolling and folding the plate material 1, at least one electrode component 8, an end cover 7 and other functional components; the case 13 encloses a receiving chamber 21, wherein the receiving chamber 21 can receive the electrode assembly 8 in the case 13. The shell 13 further comprises a first connecting part 10 and a second connecting part 9, wherein the first connecting part 10 and the second connecting part 9 are used as two ends of the plate after being rolled and folded to form the shell, and the two ends of the plate 1 are connected together through superposition and fixed connection to form the shell 13; by the overlapping arrangement of the first connecting part 10 and the second connecting part 9, the thickness of the shell 13 at the connecting part is increased, and the shell 13 can be prevented from being easily penetrated in the connecting process of the end part of the shell 13; the case 13 serves to provide a receiving space for the electrode assembly 8, and the case 13 may take various structures, and in some embodiments, the case 13 may include various shapes, such as a cylinder, a rectangular parallelepiped, and the like. The first connecting part 10 and the second connecting part 9 are arranged in an overlapping manner and fixedly connected to the shell 13 at the position shown in FIG. 6; the sheet 1, which is generally made of aluminum material, is replaced in the present application by a stronger steel material; the sheet 1 is used to make the housing 13; the shell 13 generally has a plurality of combination splicing schemes to form a complete shell of the battery monomer 20, and in the application, the whole shell of the shell 13 is formed by performing a rolling operation on the plate 1; the rolling is to arrange the side wall surface according to the limited size; after the sheet material 1 is rolled, the sheet material 1 forms different side wall surfaces, and the different side wall surfaces are surrounded and combined to form a shell 13 which can completely protect the electrode assembly 8; when the case 13 is enclosed, a hollow accommodating chamber 21 is formed inside the case 13 to accommodate the electrode assembly 8; the shell 13 is provided with a first connecting part 10 and a second connecting part 9 at the position enclosing the connecting end part, and the first connecting part 10 and the second connecting part 9 are overlapped and fixedly connected along the thickness direction of the shell 13; and fixedly connecting, namely fixing the first connecting part 10 and the second connecting part 9 on the basis of superposition arrangement.

According to some embodiments of the present application, referring to fig. 4 to 7, the first connecting portion 10 and the second connecting portion 9 connect two end portions of the housing 13 together by welding; the first connection portion 10 and the second connection portion 9 form a welding zone 22 by welding.

The inner surface of the first connecting part 10 and the outer surface of the second connecting part 9 are overlapped, and the first connecting part 10 and the second connecting part 9 are connected in a welding mode; by heating of the welding, the welding areas 22 are formed on the surfaces of the first connection portion 10 and the second connection portion 9, respectively; the weld zone 22 may be a weld, weld mark, or other mark produced by various welds.

The formation of the weld zone 22 fixes the first connection portion 10 and the second connection portion 9 by connecting both end portions of the case 13 by welding.

According to some embodiments of the present application, please refer to fig. 5 to 7 again, the first connecting portion 10 has a first free end 11, the second connecting portion 9 has a second free end 12, and the welding zone 22 is located between the first free end 11 and the second free end 12.

The first free end 11 and the second free end 12 are respectively located at two sides of the first connecting portion 10 and the second connecting portion 9, and the distance between the first free end 11 and the second free end 12 changes along with the change of the housing 13, so that the edge distance between the end portion of the housing 13 and the edge distance between the end portion of the housing 11 changes, which is not limited herein; the weld zone 22 is located at a position between the first free end 11 and the second free end 12, specifically, on the intersecting surface of the first connection portion 10 and the second connection portion 9.

The actual length of the side wall surface including the first and second connection portions 10 and 9 can be determined based on the circumferential dimensions of the first and second free ends 11 and 12

According to some embodiments of the present application, referring to fig. 6 to 11, the weld zone 22 is located at a distance from the first free end 11 and the second free end 12, respectively, and the absolute value of the relative distance between the weld zone and the first free end is less than 5mm, respectively, as indicated by L1 and L2.

The welding zone 22 is positioned at the part where the first connecting part 10 is connected with the second connecting part 9, and the first free end 11 and the second free end 12 are positioned at the opposite sides of the same surface of the first connecting part 10 and the second connecting part 9; the position of the welded zone 22 from the first free end 11 is set to L1, and the position of the welded zone 22 from the second free end 12 is set to L2.

The close distance between the first free end 11 and the second free end 12 which are oppositely arranged indicates that the gap behind the connection of the two end parts of the shell 13 is compact and the space is small; the stability of the housing 13 is not reduced thereby while the inner space is enlarged.

According to some embodiments of the present application, with continued reference to fig. 6 and 7, the first connecting portion 10 is located outside the second connecting portion 9, and the welding region 22 is configured to penetrate through the regions on both sides of the first connecting portion 10 and not to exceed the inner surface of the second connecting portion 9 in the direction in which the first connecting portion 10 points to the second connecting portion 9.

The fusion-bonded regions 22 are arranged to be able to penetrate both sides of the first connection portion 10; the first connecting portion 10 is located in the outer direction of the second connecting portion 9; the fused zone 22 can extend through the first connection 10 but not through the second connection 9.

The drop point of the weld can penetrate the first connection 10 and fall on the inner surface of the second connection 9, forming a weld zone 22 and connecting the first connection 10 with the second connection 9.

According to some embodiments of the present application, the thickness dimension of the second connection portion 9 on the housing 13 is smaller than the thickness dimension of the first connection portion 10.

The first connecting portion 10 is located in the outer direction of the second connecting portion 9; the first connecting part 10 is an outer surface which the shell 13 contacts for the first time during welding, and needs more thickness to bear heat and impact force caused by welding penetration, so the thickness of the first connecting part 10 is made to be larger than that of the second connecting part 9; the second connecting portion is thinned, so that space is reserved inside the shell 13, and the second connecting portion 9 and the first connecting portion 10 can be connected in a welding mode more conveniently.

Through to casing 13 surface both ends, the thickness change of first connecting portion 10 and second connecting portion 9 sets for two ends of casing 13 is convenient more for the fixed connection of casing 13, and simultaneously for the mode that welding zone 22 runs through in the embodiment that has just mentioned, the thickness of second connecting portion 9 is thinner for first connecting portion 10, can be better run through welding zone 22 and establish respectively in first connecting portion 10 in second connecting portion 9.

According to some embodiments of the present application, the first connecting portion 10 and the second connecting portion 9 are overlapped to form an overlapping area 6, the circumferential dimension of the welding area 22 is L3, the circumferential dimension of the overlapping area 6 is L4, and the relationship between the welding area 22 and the overlapping area 6 is 1/4 or more and L4/L3<1.

The first connecting part 10 and the second connecting part 9 are arranged on the shell 13 in an overlapping mode, so that an overlapping area 6 is formed; the circumferential length of the fusion-bonding zone 22 is L3, and the circumferential length of the overlap zone 6 is L4.

The circumferential sizes of the welding area 22 and the overlapping area 6 are limited by the scheme, when the circumferential size of the welding area and the circumferential size of the overlapping area 6 meet the condition that L4/L3 is more than or equal to 1/4 and less than or equal to 1/1, the strength of the overlapping area 6 can resist the impact generated by manufacturing the welding area 22 when the shell is connected, and the welding area 22 can normally penetrate through the first connecting part and the second connecting part to fix the end part of the shell.

According to some embodiments of the present application, the housing 13 is made of steel, and the thickness of the housing 13 is less than 1mm.

The shell 13 is replaced by a steel shell made of steel from an aluminum shell made of traditional materials, and meanwhile, the manufacturing thickness of the wall surface of the shell 13 is reduced.

The shell 13 is made of an aluminum shell made of a traditional material and replaced by a new steel material, so that the hardness of the shell 13 is improved, and higher possibility is provided for reducing the thickness of the shell 13; meanwhile, the hardness of the shell 13 is improved, so that the thickness of the outer wall surface of the shell 13 can be reduced to be less than 1mm, and more space is created for the interior of the battery monomer.

According to some embodiments of the present application, please refer to fig. 4 to 7, the outer surface of the housing 13 is composed of a plurality of sidewalls, and after enclosing the different sidewalls, the inner space formed by the sidewalls is the accommodating cavity in the housing;

one of the side walls includes the first connection portion 10 and the second connection portion 9, and the first connection portion 10 and the second connection portion 9 are stacked in a thickness direction of the one side wall.

The shell 13 is formed by folding the plate 1, in the folding process, the shell 13 forms a plurality of different side wall surfaces, the side wall surfaces connected with two end parts of the shell 13 comprise a first connecting part 10 and a second connecting part 9, and the first connecting part 10 and the second connecting part 9 are overlapped and connected in the thickness direction of the side wall surfaces to form the outer surface of the shell 13; while the inner space enclosed by the side wall surfaces forms the receiving chamber 21.

The accommodating cavity 21 is used for accommodating an electrode assembly, and the plate 1 forms an initial form of the case 13 by being folded, and is arranged by overlapping the first connecting part 10 and the second connecting part 9 in the thickness direction of the side wall surface so as to be different from the arrangement of other cases 13.

According to some embodiments of the present application, the battery cell 20 includes an electrode assembly 8, an end cap 7, and the case 13 described in any of the above embodiments, the electrode assembly 8 is disposed in the accommodating cavity 21 of the case 13, the case 13 includes two openings at two ends of the accommodating cavity 21, and the two end caps 7 are respectively used for covering the two openings.

In the present application, please refer to fig. 4 again, the present application further provides a battery cell 20, including the housing 13 in any one of the above solutions; the electrode assembly 8 is disposed in the accommodating cavity 21 formed by enclosing a plurality of side walls of the case 13, and the case 13 further includes two openings disposed at two ends of the accommodating cavity 21, and the two openings are combined with the case 13 by the end cap 7.

The housing of the battery cell 20 is formed by combining a shell 13, a containing cavity 21 and a cover 7, wherein the containing cavity 21 is used for placing the electrode assembly 8, and the cover 7 is used for covering the sealed shell 13; the case 13 is surrounded by a plurality of side wall surfaces, thereby forming an integral housing of the battery cell 20.

According to some embodiments of the present application, the electrode assembly 8 includes a main body portion and a tab 8a, the tab 8a extends from one end of the main body portion in the thickness direction of the end cap, and includes a straight portion 18 and a bent portion 19, the straight portion 18 is provided with the bent portion 19 at both ends in the length direction of the end cap 7;

the shell 13 comprises a plurality of side walls, the plurality of side walls enclose to form an accommodating cavity 21, the plurality of side walls comprise two first side walls which are oppositely arranged along the thickness direction of the end cover 7 and two second side walls which are oppositely arranged along the length direction of the end cover 7, the straight part 18 is parallel to the second side walls and is arranged on the same side or different sides along the length direction of the electrode assembly, and the bent part 19 is positioned on the same side or different sides along the thickness direction of the electrode assembly; the distances between the bent part 19 and the straight part and the shell in the thickness direction and the length direction are less than or equal to 10mm.

Referring to fig. 4 and 5 again, the electrode assembly in the battery cell 20 is formed by combining a main body portion and a tab 8a, the tab 8a extending outward in the height direction of the main body portion; the main body part comprises a straight part 18 and a bending part 19, and the two sides of the straight part 18 along the length direction of the end cover 7 are provided with the bending parts 19;

the housing 13 includes a plurality of side walls, and two side walls disposed opposite to each other in the thickness direction of the end cap 7 are a first side wall a and a first side wall b, respectively, and two side walls disposed opposite to each other in the length direction of the end cap 7 are a second side wall a and a second side wall b, respectively.

A tab 8a of the electrode assembly 8 is used to connect an electrode terminal 17 on the cap body 7, thereby forming an energizing circuit, and to couple the main body portion with the cap body 7; the electrode assembly 8 passes through a combination of the straight portion 18 and the bent portion 19; the housing 13 is formed of two side walls, a first side wall a and a first side wall b, which are oppositely disposed in the thickness direction, and a second side wall a and a second side wall b, which are oppositely disposed in the length direction.

According to some embodiments of the present application, the present application also provides a battery 100 including the battery cell 20 mentioned in any one of the above aspects.

The battery 100 includes a case 14 and a battery cell 20, and the battery cell 20 is accommodated in the case 14.

A plurality of battery cells 20 form the battery 100, and the battery cells 20 can be used as the battery 100 to provide an electric energy power supply source.

According to some embodiments of the present application, the present application further provides an electric device, which includes the battery 100 of any one of the above aspects, and the battery 100 is used to provide electric energy for the electric device.

According to some embodiments of the present application, referring to fig. 4 to 7, the present application provides a novel battery with a casing 13 made of steel material, the casing 13 includes two electrode assemblies 8 therein, tabs 8a are located at the upper ends of the electrode assemblies 8, and the two electrode assemblies 8 are oppositely disposed between the side walls; a first connecting part 10 and a second connecting part 9 are oppositely arranged on the thickness direction of the side wall surface at the position where two ends of the shell 13 are crossed, and a first free end 11 and a second free end 12 corresponding to the first connecting part and the second connecting part are arranged; the area where the first connecting part 10 and the second connecting part 9 are overlapped comprises a welding area 22, and the overlapped part of the first connecting part 10 and the second connecting part 9 is set as an overlapping area 6; the side wall surfaces enclose a containing cavity 21 in which the electrode assembly 8 can be placed; the case 13 hermetically stores the electrode assembly 8 in combination with the end cap 7 to form a battery cell 20.

According to some embodiments of the present application, referring to fig. 8 and 9, after the housing 13 is enclosed to form the accommodating cavity 21 in the manner of the above-mentioned embodiments, the housing 13 creates an additional space at the position where the first free end 11 and the second free end 12 intersect, i.e., the position indicated in fig. 9, so as to increase the energy density of the electrode assembly 8.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. 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 rather to cover all embodiments falling within the scope of the appended claims.

Claims (13)

1. A shell for a battery cell, wherein the shell is formed by folding a sheet material in a rolling way, and comprises a containing cavity enclosed by the shell, and the containing cavity is used for containing an electrode assembly in the battery cell;

the shell comprises a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are arranged in an overlapped mode and fixedly connected.

2. The case according to claim 1, wherein the first connection portion and the second connection portion are welded and form a welded region, and the welded region is formed at each of the first connection portion and the second connection portion.

3. The case of claim 2, wherein the first connection portion has a first free end and the second connection portion has a second free end, the weld zone being located between the first free end and the second free end.

4. The case of claim 3, wherein the minimum circumferential distance of the fused zone from the first free end is L1, the minimum circumferential distance of the fused zone from the second free end is L2, and the value of L1-L2 is less than or equal to 5mm.

5. The case according to claim 2, wherein the first connecting portion is located outside the second connecting portion, and the welding zone is disposed to penetrate both sides of the first connecting portion and not to exceed an inner surface of the second connecting portion in a direction in which the first connecting portion is directed toward the second connecting portion.

6. The housing of claim 5, wherein a thickness of the second connection portion is less than or equal to a thickness of the first connection portion.

7. The shell according to claim 2, wherein the first connecting portion and the second connecting portion are overlapped to form an overlapping region, the circumferential dimension of the welding region is L3, the circumferential dimension of the overlapping region is L4, and the relation between the welding region and the overlapping region is 1/4 or more and L4/L3<1.

8. The housing of claim 1, wherein the housing is made of steel and has a thickness of less than or equal to 1mm.

9. The housing of claim 1, wherein the housing comprises a plurality of sidewalls that enclose the receiving cavity;

one of the side walls includes the first connection portion and the second connection portion, and the first connection portion and the second connection portion are arranged in an overlapping manner in a thickness direction of the one side wall.

10. A battery cell comprising an electrode assembly, an end cap and the housing of any one of claims 1-9, wherein the electrode assembly is disposed in the receiving cavity of the housing, the housing comprises two openings at two ends of the receiving cavity, and the two end caps are respectively used for covering the two openings.

11. The battery cell as recited in claim 10, wherein the electrode assembly includes a main body portion and a tab extending from one end of the main body portion in the height direction, the main body portion includes a straight portion and a bent portion, and the straight portion is provided with the bent portion at both ends of the end cap in the length direction;

the shell comprises a plurality of side walls, the side walls enclose the accommodating cavity, and the side walls comprise two first side walls arranged oppositely along the thickness direction of the end cover and two second side walls arranged oppositely along the length direction of the end cover; the straight part is parallel to the second side wall and is arranged on the same side or different sides along the length direction of the electrode assembly, and the bent part is positioned on the same side or different sides in the thickness direction of the electrode assembly; the distance between the bent part and the straight part and the shell in the thickness direction and the length direction are both smaller than or equal to 10mm.

12. A battery comprising the battery cell of any one of claims 10-11.

13. A powered device comprising a battery as claimed in claim 12 for providing electrical power.

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