CN216413167U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, battery and power consumption device. The battery monomer comprises a shell, an electrode assembly, an end cover, a first pole and a second pole, wherein the shell comprises two side walls which are vertical to a first direction and are arranged at intervals, and a bottom wall which is vertical to a second direction and is connected with the two side walls, the shell is provided with two side openings which are oppositely arranged in a third direction and a top opening which is oppositely arranged with the bottom wall, the coverage area of the side openings is smaller than the area of the side walls, the first direction, the second direction and the third direction are mutually vertical, and the electrode assembly is arranged in an accommodating cavity and comprises a main body part, and a first pole lug and a second pole lug which extend out of the main body part and have opposite polarities; an end cap is coupled to the housing to cover the first and second side openings and the top opening to close the housing. The first pole column and the second pole column are arranged on the end cover, the first pole column is electrically connected with the first pole lug, and the second pole column is electrically connected with the second pole lug. The assembly difficulty of the battery monomer is low.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

The lithium ion battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and is widely applied to various devices.

In addition to improving the performance of the battery, assembly problems are also a considerable problem in the development of battery technology.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell, a battery and an electric device, so as to reduce the assembly difficulty of the battery cell.

In a first aspect, the application provides a single battery, the single battery includes a housing, an electrode assembly, an end cap, a first pole and a second pole, the housing includes two sidewalls perpendicular to a first direction and arranged at an interval, and a bottom wall perpendicular to a second direction and connected to the two sidewalls, the two sidewalls and the bottom wall enclose to form a receiving cavity, the housing has two side openings oppositely arranged in the third direction and a top opening oppositely arranged to the bottom wall, the two side openings include a first side opening and a second side opening, the covering area of the side openings is smaller than the area of the sidewalls, the first direction, the second direction and the third direction are mutually perpendicular, the electrode assembly is arranged in the receiving cavity and includes a main body part and a first pole lug and a second pole lug which extend out from the main body part and have opposite polarities; an end cap is coupled to the housing to cover the first and second side openings and the top opening to close the housing. The first pole column and the second pole column are arranged on the end cover, the first pole column is electrically connected with the first pole lug, and the second pole column is electrically connected with the second pole lug.

Among the technical scheme of this application embodiment, the casing includes diapire and two lateral walls totally three walls of relative setting, can lean out and then form the flaring with two lateral walls of casing for the diapire when the assembly, so electrode assembly moving direction when going into the shell need not strictly keep perpendicular with the opening face, and then reduce the assembly degree of difficulty. And the casing includes three openings, so electrode assembly can go into the casing from three directions when going into the casing, and the assembly flexibility is high, further reduces the assembly degree of difficulty.

In some embodiments, the housing is integrally formed by bending at the junction of the side wall and the bottom wall. The shell comprises a bottom wall and two opposite side walls, and can be formed by a simple bending process, so that the processes of stretching, extruding aluminum and the like in the existing shell machining process are omitted, and the manufacturing cost is reduced.

In some embodiments, the first tab and the second tab respectively extend from two ends of the main body in the third direction, the end caps include a first end cap for disposing the first terminal and a second end cap for disposing the second terminal, and the first end cap and the second end cap are separately disposed. The first pole lug and the second pole lug extend out of two ends of the main body part respectively, the first end cover and the second end cover are arranged in a split mode, and the first pole lug and the second pole lug can be conveniently assembled with the shell in a rotating mode after the pole lugs on the end covers are welded.

In some embodiments, a first end cap covers the first side opening and at least a portion of the top opening, a second end cap covers the second side opening and at least a portion of the top opening, and the first end cap and the second end cap are coupled. The first end cover covers the first side opening and at least part of the top opening, and the second end cover covers the second side opening and at least part of the top opening, so that the end cover is composed of two parts, all openings of the shell can be covered, and welding steps in assembly are simplified.

In some embodiments, the first end cap and the second end cap are symmetrically disposed. The first end cover and the second end cover are symmetrically arranged, namely the second sub-body of the first end cover and the fourth sub-body of the second end cover are equal in length. Therefore, the first end cover and the second end cover have the same structure size, and can be manufactured in a unified manner during manufacturing, so that the manufacturing cost is reduced.

In some embodiments, the first end cover includes a first sub-body covering the first side opening and a second sub-body covering at least a part of the top opening, the second end cover includes a third sub-body covering the second side opening and a fourth sub-body covering at least a part of the top opening, the first sub-body is provided with a first pole, the third sub-body is provided with a second pole, and the second sub-body and the fourth sub-body are connected. The first pole column on the first end cover is connected with the first pole lug, the second pole column on the second end cover is connected with the second pole lug, then the second split body and the fourth split body are connected, and the assembly process is simple.

In some embodiments, the connecting end of the second section and the connecting end of the fourth section are male-female mated. The connecting end of the second sub-body and the connecting end of the fourth sub-body are matched in a concave-convex mode so as to achieve accurate positioning and matching of the second sub-body and the fourth sub-body and further prevent electrolyte leakage.

In some embodiments, the junction of the first and second sub-bodies is rounded; and/or the joint of the third split and the fourth split is a round angle. The arrangement of the round angle can avoid damage to the electrode assembly and an assembling person when the first end cover and the electrode assembly are connected and assembled.

In some embodiments, the junction of the first and/or third sub-bodies and the bottom wall is a right angle. The connecting part of the first split body and/or the third split body and the bottom wall is set to be a right angle, so that a fillet formed at the intersection angle position of the shell formed by the traditional stretching process is avoided, the interference between the fillet and the electrode assembly is reduced, the space utilization rate of the shell can be improved, and the energy density of a battery monomer is improved.

In some embodiments, the first tab and the second tab each extend from the main body portion toward the side of the top opening, the end cover is of a groove-type structure and includes two side cover portions covering the two side openings and a top cover portion covering the top opening, and the first pole and the second pole are disposed on the top cover portion. The first tab and the second tab extend from one side of the main body portion, so that the end cap of the groove type structure can be directly assembled with the electrode assembly without arranging the end cap into two separate structures, thereby reducing the connecting step of the two separate structures of the end cap and simplifying the assembling process.

In some embodiments, the junction of the side wall and the bottom wall of the housing is rounded. The bending part of the shell is set to be a round angle, so that the processing is convenient, and the damage to the electrode assembly is avoided.

In a second aspect, the present application provides a battery including the above battery cell.

In a third aspect, the present application provides an electric device comprising the above battery for providing electric energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

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

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

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

FIG. 4 is a front view of a housing according to some embodiments of the present application;

FIG. 5 is a side view schematic of a housing according to some embodiments of the present application;

FIG. 6 is a side view schematic illustration of a first endcap of some embodiments of the present application;

FIG. 7 is a side view schematic illustration of a second endcap of some embodiments of the present application;

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

FIG. 9 is a schematic cross-sectional view taken along A-A of FIG. 8;

fig. 10 is a schematic top view of a battery cell according to some embodiments of the present application;

FIG. 11 is a schematic cross-sectional view taken along line B-B of FIG. 10;

fig. 12 is a partially enlarged structural view of a portion M in fig. 11;

fig. 13 is a partial enlarged structural view of a portion N in fig. 11;

FIG. 14 is a schematic side view of a battery cell according to some embodiments of the present application;

fig. 15 is a partially enlarged structural view of a portion P in fig. 14;

fig. 16 is a schematic perspective view of a battery cell according to another embodiment of the present disclosure;

fig. 17 is a schematic cross-sectional view of the battery cell shown in fig. 16;

fig. 18 is a step diagram of a method of manufacturing a battery cell according to some embodiments of the present application.

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

Description of the labeling:

a vehicle 1000;

battery 100, controller 200, motor 300;

a box 10, a first part 11, a second part 12;

the battery cell 20, the housing 21, the side wall 211, the corner 211a, the bottom wall 212, the electrode assembly 22, the main body 221, the first tab 222, the second tab 223, the end cap 23, the first end cap 231, the first split 2311, the second split 2312, the second end cap 232, the third split 2321, the fourth split 2322, the first pole 24, and the second pole 25;

a first direction X, a second direction Z, a third direction Y.

Detailed Description

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

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

Reference 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 can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter 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), and "plural pieces" refers to two or more (including two).

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

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

Current battery cells generally include a case, an end cap, and an electrode assembly accommodated in the case, and an electrolyte is filled in the case. The electrode assembly is a part in which electrochemical reactions occur in the battery cell, the case is an assembly forming the internal environment of the battery cell, and the end cap is a part covering the opening of the case to insulate the internal environment of the battery cell from the external environment. In some existing single batteries, the side and the bottom of a shell are closed, and an opening is formed in the top of the shell; there are also cells that have a housing that is closed on the sides and that has openings in the top and bottom. Then, when assembling the battery cell, it is also necessary to put the electrode assembly into the case from the top opening or the bottom opening to complete the assembly. The inventor of the present application finds that, in the assembly process of these single batteries, since four sides of the case are closed, when the single batteries enter the case, the moving direction of the electrode assembly needs to be strictly controlled to be perpendicular to the opening surface of the case, so as to avoid the electrode assembly from being scratched due to contact with the case, and therefore, the assembly difficulty is high. And because four sides of the shell are all closed, a part of assembly space needs to be reserved when the shell is manufactured, thereby causing the loss of energy density. Moreover, since the housing is generally formed by drawing, the corners of the four edges of the housing are inevitably rounded, and for the electrode assembly adopting the lamination structure, the inner rounded corners interfere with the edges of the pole pieces, so that the width and length of the pole pieces must be reduced to avoid the inner rounded corners of the housing during the design of the electrode assembly adopting the lamination structure, which causes the loss of energy density.

In order to solve the problem that the assembly difficulty of the single battery is high, the inventor researches and discovers that two side walls of the single battery shell can be removed, the shell only comprises a bottom wall and three opposite side walls, the two side walls of the shell can be outwards inclined relative to the bottom wall during assembly to form a flared opening, the moving direction of an electrode assembly when entering the shell does not need to be strictly vertical to the opening, the assembly flexibility is high, and the assembly difficulty is reduced. And the casing only includes diapire and two lateral walls that set up relatively, can adopt simple bending process to form, has saved processes such as tensile, crowded aluminium that adopt in the current casing course of working, reduces manufacturing cost.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. A power supply system including the electric device composed of the battery cell, the battery, and the like disclosed in the present application may be used.

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

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is 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 power demand for operation when the vehicle 1000 is started, navigated, or driven.

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 10 and a battery cell 20. The battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure having one open end, the first part 11 may be a plate-shaped structure, and the first part 11 is covered on the open side of the second part 12 such that the first part 11 and the second part 12 together define a receiving space. The first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple 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 multiple 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 10; 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 accommodating the whole in the case 10. The battery 100 may further 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 perspective view of a battery cell 20 according to some embodiments of the present disclosure. As shown in fig. 3 and with reference to fig. 9, the battery cell 20 includes a housing 21, an electrode assembly 22, an end cap 23, a first terminal post 24, a second terminal post 25, and other functional components.

The case 21 is an assembly forming an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 22, an electrolyte, and other components. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained within the case 21. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. In the charging and discharging process of the battery, the anode active substance and the cathode active substance react with the electrolyte, and the tab is connected with the pole to form a current loop.

The end cap 23 refers to a member that covers an opening of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 23 may be adapted to the shape of the housing 21 to fit the housing 21. Optionally, the end cap 23 may be made of a material (e.g., an aluminum alloy) with certain hardness and strength, so that the end cap 23 is not easily deformed when being extruded and collided, the single battery 20 may have higher structural strength, the safety performance may be improved, and functional components such as a pole may be disposed on the end cap 23. The pole is used to electrically connect with the electrode assembly 22 for outputting or inputting electric energy of the battery cell 20. In some embodiments, the end cap 23 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or the temperature of the battery cell 20 reaches a threshold value, and the end cap 23 may also be made of various materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 23, which may be used to isolate the electrical connection components within the housing 21 from the end cap 23 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

Referring to fig. 3 to 11, fig. 3 is a schematic perspective view of a battery cell 10 according to some embodiments of the present disclosure. Fig. 4 is a front view of a housing according to some embodiments of the present disclosure. FIG. 5 is a side view of a housing according to some embodiments of the present application. FIG. 6 is a side view schematic illustration of a first endcap according to some embodiments of the present application. FIG. 7 is a side view schematic illustration of a second endcap according to some embodiments of the present application. Fig. 8 is a schematic front view of a battery cell according to some embodiments of the present disclosure. Fig. 9 is a schematic sectional view along a-a in fig. 8. Fig. 10 is a schematic top view of a battery cell according to some embodiments of the present disclosure. Fig. 11 is a schematic sectional view along the direction B-B in fig. 10.

The battery cell 20 provided by the embodiment of the application comprises a shell 21, an electrode assembly 22, an end cover 23, a first pole 24 and a second pole 25. The housing 21 includes two sidewalls 211 arranged at an interval perpendicular to the first direction X and a bottom wall 212 perpendicular to the second direction Z and connecting the two sidewalls 211. The two side walls 211 and the bottom wall 212 enclose a receiving cavity. And the housing 21 has two side openings oppositely disposed in the third direction Y and a top opening oppositely disposed to the bottom wall 212. The two side openings comprise a first side opening and a second side opening, the coverage area of the side openings is smaller than the area of the side walls, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other. The electrode assembly 22 is disposed within the receiving cavity and includes a body portion 221 and first and second opposite pole tabs 222 and 223 extending from the body portion 221. The end cap 23 is connected with the case 21 to cover the first and second side openings and the top opening to close the case 21. The first pole post 24 and the second pole post 25 are disposed on the end cap 23, and the first pole post 24 is electrically connected to the first tab 222, and the second pole post 25 is electrically connected to the second tab 223.

As shown in fig. 3, the first direction X is a thickness direction of the battery cell 20, the second direction Z is a height direction of the battery cell 20, and the third direction Y is a length direction of the battery cell 20.

As shown in fig. 4 and 5, the housing 21 includes two oppositely disposed side walls 211 and a bottom wall 212 connecting the two side walls 211. That is, case 21 includes three wall surfaces that enclose a receiving cavity for housing electrode assembly 22. As shown in fig. 5, the side walls 211 are perpendicular to the bottom wall 212 after the assembly of the battery cell is completed, but the side walls 211 may be slightly inclined outward with respect to the bottom wall 212 during the assembly of the battery cell to increase the degree of freedom when the electrode assembly is housed. The housing 21 comprises only three walls, such that the housing 21 has three openings, respectively a first side opening and a second side opening oppositely arranged in the third direction Y and a top opening oppositely arranged to the bottom wall 212. Wherein the first side opening and the second side opening cover an area smaller than the area of the sidewall 211.

The electrode assembly 22 is disposed within the receiving cavity and includes a body portion 221 and first and second opposite pole tabs 222 and 223 extending from the body portion 221. In the embodiment shown in fig. 3 to 11, the first tab 222 and the second tab 223 protrude from both ends of the body part 221 in the third direction Y, respectively. In other embodiments, referring to fig. 16 and 17, the first tab 222 and the second tab 223 may also both protrude from the second direction Z of the body part 221.

Since the housing 21 has the first side opening and the second side opening which are oppositely arranged in the third direction Y and the top opening which is oppositely arranged to the bottom wall 212, the end cap 23 of the embodiment of the present application is connected to the housing 21 to cover both the side openings and the top opening to close the housing 21. The end cap 23 may include a first end cap 231 and a second end cap 232 to collectively cover the above two side openings and the top opening.

The free casing 21 of battery of this application embodiment includes diapire and two lateral walls totally three walls of relative setting, can lean out and then form the flaring with two lateral walls of casing for the diapire when the assembly, and then the moving direction of electrode subassembly when going into the shell need not strictly keep perpendicular with the opening face, and then reduces the assembly degree of difficulty. And the case 21 includes three openings, the electrode assembly 22 can be inserted into the case from three directions when being inserted into the case, so that the assembly flexibility is high, and the assembly difficulty is further reduced.

According to some embodiments of the present application, the housing 21 is integrally formed by bending at the junction of the side wall 211 and the bottom wall 212.

Specifically, a single flat plate may be formed by bending at the junction of the side wall 211 and the bottom wall 212 according to the size of the side wall 211 and the bottom wall 212.

The shell 21 comprises a bottom wall 212 and two opposite side walls 211, and can be formed by a simple bending process, so that processes such as stretching, aluminum extrusion and the like adopted in the existing shell machining process are omitted, and the manufacturing cost is reduced.

According to some embodiments of the present application, referring to fig. 14 and 15, the junction of the side wall 211 and the bottom wall 212 of the housing 21 is rounded. That is, the bent portion of the case 21 is formed as a rounded corner, which facilitates processing and prevents damage to the electrode assembly 22.

According to some embodiments of the present application, the first tab 222 and the second tab 223 protrude from both ends of the body part 221 in the third direction Y, respectively. The end cap 23 comprises a first end cap 231 in which the first pole post 24 is arranged and a second end cap 232 in which the second pole post 25 is arranged. The first and second end caps 231 and 232 are provided separately.

The first tab 222 and the second tab 223 extend from both ends of the body part 221 in the third direction Y, respectively. The first end cap 231 provided with the first pole 24 and the second end cap 232 provided with the second pole 25 are separately provided. In a specific embodiment, as shown in fig. 13, the first end cap 231 is of an L-shaped structure, the first end cap 231 includes a first sub-body 2311 extending along the second direction Z and a second sub-body 2312 extending along the third direction Y, the first terminal 24 is disposed on the first sub-body 2311, the second end cap 232 is also of an L-shaped structure, the second end cap 232 includes a third sub-body 2321 extending along the second direction Z and a fourth sub-body 2322 extending along the third direction Y, and the second terminal 25 is disposed on the third sub-body 2321. Before assembly, the first and second tabs 222 and 223 of the electrode assembly 22 each extend in the third direction Y. In assembling the battery cell 20, the first sub-body 2311 is first arranged in parallel with the first tab 222, the first pole 24 on the first sub-body 2311 is connected (e.g., welded) with the first tab 222, the third sub-body 2321 is likewise arranged in parallel with the second pole 223, the second pole 25 on the third sub-body 2321 is connected (e.g., welded) with the second pole 223, then the first end cap 231 is rotated to bend the first pole 222 and rotate the second sub-body 2312 of the first end cap 231 to a position covering the top opening, the second end cap 232 is rotated to bend the second pole 232 and rotate the fourth sub-body 2322 of the second end cap 232 to a position covering the top opening, thereby completing the assembly of the end cap 23 with the electrode assembly 22, then the assembled end cap 23 and the electrode assembly 22 are placed in the housing 23121, and the second sub-body 2312 and the fourth sub-body 2322 are connected and the end cap 23 is connected with the housing 21, thereby completing final assembly. As can be seen, in the above embodiment, the first end cap 231 covers the first side opening and a portion of the top opening, and the second end cap 231 covers the second side opening and a portion of the top opening. In other embodiments, the first end cap 231 may cover only the first side opening, and the second end cap 232 covers the second side opening and the top opening; or the first end cap 231 covers the first side opening and the top opening and the second end cap 232 covers the second side opening.

The first tab 222 and the second tab 223 extend from two ends of the main body 221 respectively, and the first end cap 231 and the second end cap 232 are separately arranged, so that the first tab and the second tab can be conveniently welded to each other by the terminal on the end cap 23, and then can be rotated to be assembled with the housing 21.

According to some embodiments of the present application, the first end cap 231 covers the first side opening and at least a portion of the top opening. The second end cap 232 covers the second side opening and at least part of the top opening, and the first end cap 231 and the second end cap 232 are connected.

As shown in fig. 6, 7 and 11, the first section 2311 of the first endcap 231 covers the first side opening and the second section 2312 of the first endcap 231 covers at least a portion of the top opening. Third split 2321 of second end cap 232 covers the second side opening, fourth split 2322 of second end cap 232 covers at least a portion of the top opening, and second split 2312 and fourth split 2322 are connected to cover the entire top opening.

The first end cap 231 covers the first side opening and at least part of the top opening, and the second end cap 232 covers the second side opening and at least part of the top opening, so that the end cap 23 is formed by two parts, namely, the covering of all the openings of the shell 21 can be realized, and the welding step in assembly is simplified.

According to some embodiments of the present application, the first and second endcaps 231 and 232 are symmetrically disposed.

The first and second caps 231 and 232 are symmetrically disposed, that is, the second body 2312 of the first cap 231 and the fourth body 2322 of the second cap 232 have the same length. Therefore, the first end cap 232 and the second end cap 232 have the same structural size, and can be manufactured in a unified manner during manufacturing, so that the manufacturing cost is reduced.

Of course, in other embodiments, the lengths of the second body 2312 of the first end cap 231 and the fourth body 2322 of the second end cap 232 may be set to be unequal as desired.

According to some embodiments of the present application, the first end cap 231 includes a first section 2311 covering the first side opening and a second section 2312 covering at least a portion of the top opening. Second end cap 232 includes a third sub-body 2321 that covers the second side opening and a fourth sub-body 2322 that covers at least a portion of the top opening. The first sub-body 2311 is provided with a first pole 24. The third sub-body 2321 is provided with a second pole 25, and the second sub-body 2312 is connected with the fourth sub-body 2322.

The end cap 23 includes a first end cap 231 and a second end cap 232, the first terminal 24 on the first end cap 231 is connected to the first tab 222, the second terminal on the second end cap 232 is connected to the second tab 223, and then the second sub-body 2312 and the fourth sub-body 2322 are connected to assemble the end cap 23 and the electrode assembly 22, so that the assembling process is simple.

According to some embodiments of the present application, the connection end of second section 2312 and the connection end of fourth section 2322 are male-female mated.

Specifically, as shown in fig. 6, 7 and 12, the connection end of the second sub-body 2312 is provided with a first step surface, the connection end of the fourth sub-body 2322 is provided with a second step surface, and when the third sub-body 2312 and the fourth sub-body 2322 are assembled and connected, two vertical surfaces of the first step surface are respectively abutted with two vertical surfaces of the second step surface, so as to form positioning in the third direction Y when the third sub-body 2312 and the fourth sub-body 2322 are connected, so that the connection of the third sub-body 2312 and the fourth sub-body 2322 can form a sealing effect to prevent electrolyte leakage.

The connection end of the second segment 2312 and the connection end of the fourth segment 2322 are in concave-convex fit to achieve accurate positioning and matching of the second segment 2312 and the fourth segment 2322, thereby preventing electrolyte leakage.

According to some embodiments of the present application, referring to fig. 6, the junction of the first body 2311 and the second body 2312 is rounded. The junction between the first and second sub-bodies 2311 and 2312 is rounded, so that damage to the electrode assembly and the assembler can be prevented when the first end cap 231 and the electrode assembly 22 are coupled and assembled.

According to some embodiments of the present application, referring to fig. 7 and 13, the junction of third split 2321 and fourth split 2322 is rounded. The junction of the third sub-body 2321 and the fourth sub-body 2322 is a rounded corner, which can also avoid damage to the electrode assembly and the assembly personnel.

Specifically, as shown in fig. 4, the corner positions 211a of the two side walls 211 are set to be rounded, the joint of the first split body 2311 and the second split body 2312 is rounded, and the joint of the third split body 2321 and the fourth split body 2322 is rounded, so that when the first end cover 231 and the housing 21 are assembled, the rounded corners of the corner positions of the side walls 211 are matched with the rounded corners of the bent positions of the first end cover 231. Meanwhile, when the electrode assembly 22 is placed in the case, the corner 211a of the sidewall 211 is set to be a rounded corner, so that damage to the electrode assembly and an assembler can be further avoided.

According to some embodiments of the present application, the connection of the first sub-body 2311 and/or the third sub-body 2321 to the sidewall 211 is at a right angle.

As shown in fig. 3 in particular, the bottom edge of the first sub-body 2311 of the first end cap 231 is joined to the bottom wall 212 of the housing 21 by external welding (e.g., laser welding) so that the junction of the first sub-body 2311 and the bottom wall 212 is at a right angle. Likewise, the bottom edge of the third sub-body 2321 of the second end cap 232 is connected to the bottom wall 212 of the housing 21 by external welding (e.g., laser welding) so that the junction of the third sub-body 2321 and the bottom wall 212 is at a right angle.

The joint of the first sub-body 2311 and/or the third sub-body 2321 and the bottom wall 212 is set to be a right angle, so that a fillet formed at the intersection angle of the shell formed by the traditional stretching process is avoided, the interference between the fillet and the electrode assembly is reduced, the space utilization rate of the shell can be improved, and the energy density of the battery cell is improved.

Specifically, in the embodiment shown in fig. 3, the junction of the first sub-body 2311 of the first end cap 231 and the two side walls 211 of the housing 21 is provided at a right angle. The junction between the third sub-body 2321 of the second end cap 232 and the two side walls 211 of the housing 21 is set at a right angle. Therefore, the space utilization rate of the shell is further improved, and the energy density of the battery monomer is improved.

According to some embodiments of the present application, referring to fig. 16 and 17, both the first tab 222 and the second tab 223 protrude from the body portion 221 toward the top opening side. The end cover 23 is of a groove-shaped structure and comprises two side cover parts covering two side openings and a top cover part covering the top opening, and the first pole 24 and the second pole 25 are arranged on the top cover part.

The first tab 222 and the second tab 223 extend from the main body 221 toward the top opening side, and before assembly, the first tab 222 and the second tab 223 extend in the second direction Z, when the battery cell is assembled, firstly, the top cover portion of the end cover 23 is arranged in parallel with the first tab 222 and the second tab 223, the first pole 24 on the end cover 23 is connected with the first tab 222, the second pole 25 is connected with the second tab 223, then, the end cover 23 is rotated to bend the tabs, so that assembly of the end cover 23 and the electrode assembly 22 can be completed, and then, the end cover 23 and the electrode assembly 22 are placed into the housing 21 and the end cover 23 and the housing 21 are connected to complete assembly of the battery cell 20.

The first tab 222 and the second tab 223 protrude from one side of the body part 221 such that the end cap 23 of the groove type structure can be directly assembled with the electrode assembly 22 without providing the end cap 23 in a two-divided structure, thereby reducing the number of connection steps to the two-divided structure of the end cap 23 and simplifying the assembly process.

According to some embodiments of the present application, the end cap 23 is integrally formed. For example, the joint between the top lid part and the side lid part may be bent.

According to some embodiments of the present application, there is also provided a battery including the battery cell of any of the above aspects.

According to some embodiments of the present application, there is also provided an electric device, including the battery of any of the above aspects, and the battery is used for providing electric energy for the electric device.

The powered device may be any of the aforementioned battery-powered devices or systems.

Referring to fig. 18, the present application also provides a method of manufacturing a battery cell, according to some embodiments of the present application, including the steps of:

s101, providing a shell 21, wherein the shell 21 comprises two side walls 211 which are perpendicular to a first direction X and are arranged at intervals and a bottom wall 212 which is perpendicular to a second direction Z and is connected with the two side walls 211, the two side walls 211 and the bottom wall 212 enclose to form an accommodating cavity, the shell 21 is provided with a first side opening and a second side opening which are oppositely arranged in a third direction Y and a top opening which is oppositely arranged with the bottom wall 212, and the first direction X, the second direction Z and the third direction Y are mutually perpendicular;

s102, providing an electrode assembly 22, an end cap 23, and a first pole 24 and a second pole 25, where the electrode assembly 22 includes a main body 221, and a first tab 222 and a second tab 223 extending from the main body 221 and having opposite polarities, and the first pole 24 and the second pole 25 are disposed on the end cap 23;

s103, electrically connecting the first pole 24 with the first tab 222 and the second pole 25 with the second tab 223, placing the electrode assembly 22 in the receiving cavity of the case 21, and connecting the end cap 23 with the case 21 such that the end cap 23 closes the case 21.

The free casing 21 of battery of this application embodiment includes diapire and two lateral walls totally three walls of relative setting, can lean out and then form the flaring with two lateral walls of casing for the diapire when the assembly, and then the moving direction of electrode subassembly when going into the shell need not strictly keep perpendicular with the opening face, and then reduces the assembly degree of difficulty.

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

Claims (13)

1. A battery cell, comprising:

the shell (21) comprises two side walls (211) which are perpendicular to a first direction (X) and are arranged at intervals and a bottom wall (212) which is perpendicular to a second direction (Z) and is connected with the two side walls (211), the two side walls (211) and the bottom wall (212) enclose to form an accommodating cavity, the shell (21) is provided with two side openings which are oppositely arranged in a third direction (Y) and a top opening which is oppositely arranged with the bottom wall (212), the two side openings comprise a first side opening and a second side opening, the coverage area of the side openings is smaller than that of the side walls (211), and the first direction (X), the second direction (Z) and the third direction (Y) are mutually perpendicular;

an electrode assembly (22) disposed within the receiving cavity and including a body portion (221) and first and second tabs (222, 223) of opposite polarity protruding from the body portion (221);

an end cap (23), the end cap (23) being connected with the housing (21) to cover the first and second side openings and the top opening to close the housing (21); and

first utmost point post (24) and second utmost point post (25) set up on end cover (23), just first utmost point post (24) with first utmost point ear (222) electricity is connected, second utmost point post (25) with second utmost point ear (223) electricity is connected.

2. The battery cell according to claim 1, wherein the housing (21) is integrally formed by bending at the junction of the side wall (211) and the bottom wall (212).

3. The battery cell according to claim 1, wherein the first tab (222) and the second tab (223) respectively protrude from two ends of the main body portion (221) in the third direction (Y), the end cap (23) comprises a first end cap (231) provided with the first pole (24) and a second end cap (232) provided with the second pole (25), and the first end cap (231) and the second end cap (232) are separately provided.

4. A battery cell according to claim 3, wherein the first end cap (231) covers a first side opening and at least part of the top opening, the second end cap (232) covers a second side opening and at least part of the top opening, the first end cap (231) and the second end cap (232) being connected.

5. The battery cell according to claim 4, wherein the first end cap (231) and the second end cap (232) are symmetrically arranged.

6. The battery cell according to claim 4, wherein the first end cap (231) comprises a first sub-body (2311) covering the first side opening and a second sub-body (2312) covering at least part of the top opening, the second end cap (232) comprises a third sub-body (2321) covering the second side opening and a fourth sub-body (2322) covering at least part of the top opening, the first pole post (24) is arranged on the first sub-body (2311), the second pole post (25) is arranged on the third sub-body (2321), and the second sub-body (2312) and the fourth sub-body (2322) are connected.

7. The battery cell according to claim 6, wherein the connection end of the third division (2321) and the fourth division (2322) of the second division are concavo-convex fitted.

8. The battery cell according to claim 6, wherein the junction of the first division body (2311) and the second division body (2312) is rounded; and/or the joint of the third sub-body (2321) and the fourth sub-body (2322) is a round angle.

9. The battery cell according to claim 6, wherein the junction of the first sub-body (2311) and/or the third sub-body (2321) with the bottom wall (212) is a right angle.

10. The battery cell according to claim 1, wherein the first tab (222) and the second tab (223) each protrude from the main body portion (221) toward the top opening side, the end cap (23) is of a groove-type structure and includes two side cap portions covering the two side openings and a top cap portion covering the top opening, and the first terminal post (24) and the second terminal post (25) are each disposed on the top cap portion.

11. The battery cell according to any of claims 1 to 10, wherein the junction of the side wall (211) and the bottom wall (212) of the housing (21) is rounded.

12. A battery, comprising: the battery cell of any one of claims 1 to 11.

13. An electrical device comprising the battery of claim 12, the battery for providing electrical energy.

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