CN216054934U

CN216054934U - Battery cell, battery and power consumption device

Info

Publication number: CN216054934U
Application number: CN202120841566.2U
Authority: CN
Inventors: 钟礼斌; 郭志君
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2022-03-15
Anticipated expiration: 2031-04-22

Abstract

The embodiment of the utility model relates to the technical field of batteries, and discloses a battery monomer, a battery and an electric device. The battery monomer is used for a battery provided with a first plate, comprises an end cover, and an electrode terminal and an insertion structure which are positioned on the outer surface of the end cover, and the projection of the insertion structure in the thickness direction of the end cover is staggered with the projection of the electrode terminal in the thickness direction of the end cover. The plugging structure is used for plugging with the first plate to limit the first plate. Wherein the plug-in structures are arranged asymmetrically with respect to the center of the outer surface of the end cap. Through the mode, when the single battery is used for the battery, the single battery can be assembled with the first plate to limit the first plate, the single battery is prevented from being assembled with the first plate in error, and the reliability and the assembly efficiency of the battery are improved.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

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

In the development of battery technology, the assembly of a battery involves critical factors such as the reliability of the assembly between the components in the battery and the efficiency at the time of battery assembly. The reliability of installation among all parts is related to the battery safety performance in the later use of the battery, and the efficiency of battery assembly is related to the problem of economic cost, so that the method has great significance for the related research of battery assembly.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, embodiments of the present invention provide a battery cell, a battery and an electric device, which can improve reliability and assembly efficiency during assembly of components inside the battery.

In a first aspect, the present application provides a battery cell for a battery, the battery including a first plate, the battery cell including an end cap and a plug structure. The end cap includes at least one electrode terminal; the plug-in structure is located the end cover surface, and the plug-in structure is used for pegging graft with the first board, along the thickness direction of end cover, the projection of plug-in structure with the projection dislocation of electrode terminal to, the projection of plug-in structure is about the central asymmetric setting of end cover surface.

According to the technical scheme, the inserting structure used for inserting the first plate is arranged on the end cover of the single battery, the projection of the inserting structure is asymmetrically arranged about the center of the outer surface of the end cover, the probability of assembly errors in the assembly process can be reduced on the basis of improving the matching reliability of the single battery and the first plate, and the battery cost is saved.

In some embodiments, the at least one electrode terminal includes a first electrode terminal and a second electrode terminal having opposite polarities, and projections of the first electrode terminal, the second electrode terminal and the insertion structure are asymmetrically distributed about a center of the insertion structure in a thickness direction of the end cap to prevent the first plate from being assembled to the battery cell in a wrong assembly manner.

In some embodiments, the minimum width of the plug structure is greater than or equal to 5mm, so that the plug structure has high strength and rigidity and is not easy to bend or break under stress when the displacement of the first plate is limited.

In some embodiments, the minimum distance between the edge of the plug structure and the edge of the end cap is greater than or equal to 3mm to avoid the plug structure affecting the welding of the end cap.

In some embodiments, the plug structure includes a protrusion for cooperating with a groove on the first plate to restrain the first plate, the end cap further including a liquid injection hole closer to the first electrode terminal than the second electrode terminal, the protrusion being located between the liquid injection hole and the first electrode terminal. Thus, when the electrolyte is sprayed out from the liquid injection hole in the liquid injection process, the bulge can prevent the electrolyte from being sprayed to the first electrode terminal to corrode the first electrode terminal.

In some embodiments, the height of the protrusion is less than or equal to the height of the first electrode terminal in the thickness direction of the end cap to avoid interference with electrical connection of the first electrode terminal and other components.

In some embodiments, the height of the protrusion is greater than or equal to 0.5mm along the thickness direction of the end cap to improve the reliability of the protrusion and the groove in matching, so that the mutually matched protrusion and groove are not easy to fail.

In some embodiments, the end caps include a first end cap and a second end cap respectively located at two ends of the battery cell, the first end cap is provided with a first electrode terminal, the second end cap is provided with a second electrode terminal, and the plug-in structure is disposed on the first end cap to prevent the installation direction of the battery cell and the first plate from being incorrect.

In some embodiments, the first end cap is further provided with a liquid injection hole, the insertion structure is a protrusion, and the protrusion is disposed between the first electrode terminal and the liquid injection hole, so that the protrusion has a certain shielding effect, and shields the first electrode terminal when electrolyte is splashed during a liquid injection process.

In some embodiments, the projection includes an arc-shaped projection centered on the hole axis of the liquid injection hole, and the arc-shaped projection is used to prevent the liquid from splashing to the first electrode terminal during liquid injection, which helps to improve the effect of the projection for shielding the electrolyte from splashing.

In some embodiments, the protrusion is provided with a snap structure for limiting the displacement of the first plate along the plugging direction when plugging so as to avoid the plugging of the first plate and the battery cell from being loosened, which is helpful for improving the reliability of the matching of the battery cell and the first plate.

In a second aspect, a battery is provided, which includes at least one battery cell in the above embodiments, and a first plate, where the first plate is installed at an end of the battery cell, and the first plate is provided with a protrusion or a groove corresponding to the plug structure for being engaged with the plug structure.

In a third aspect, a power consuming device is provided, wherein the power consuming device comprises the battery of the above embodiments, and the battery is used for providing electric energy, and in some embodiments, the power consuming device is a vehicle, a ship or a spacecraft.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

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

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

fig. 4 is a schematic structural view of an end cap in a battery cell according to some embodiments of the present application;

FIG. 5 is a top view of FIG. 4 taken along the X direction;

fig. 6 is an exploded view of an end cap and end cap patch of a battery cell according to some embodiments of the present application;

fig. 7 is an exploded view of an end cap and a harness spacer in a battery cell according to some embodiments of the present application;

fig. 8 is a schematic structural view of an end cap in a battery cell according to some embodiments of the present application;

fig. 9 is an isometric view of an end cap in a battery cell of other embodiments of the present application;

FIG. 10 is a front view of the end cap shown in FIG. 9;

fig. 11 is a schematic structural view of a battery cell according to some embodiments of the present application;

fig. 12 is a schematic structural view of a first end cap in a battery cell according to some embodiments of the present application;

fig. 13 is a schematic view of a first end cap of a battery cell according to further embodiments of the present disclosure;

fig. 14 is a partial enlarged view of a portion a in fig. 7.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

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

a battery cell 20;

the electrode structure comprises an end cover 21, a first end cover 21a, a second end cover 21b, an electrode terminal 211, a first electrode terminal 211a, a second electrode terminal 211b, an inserting structure 212, a protrusion 212a, a groove 212b, an avoiding hole 212c, a buckling structure 212d and a liquid injection hole 213;

a housing 22;

an electrode assembly 23;

an end cap patch 30, a harness isolation plate 40;

center O of outer surface of end cap₁Center O of the plug-in connection₂₁₂The thickness direction X of the end cover, the minimum width D of the plug-in structure and the minimum distance L between the plug-in structure and the edge of the end cover.

Detailed Description

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

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

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

Reference 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.

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

In the field of electric vehicles such as electric automobiles and the like, a power supply system consisting of power batteries replaces a fuel oil tank in a certain sense. The power supply system is usually a battery box or a battery casing which contains a plurality of modules and other functional components (such as a water cooling device), wherein the modules are usually required to be composed of a plurality of series-parallel connected battery cells and other components. In the case of a battery cell and other component combinations or different functional component combinations, additional connecting components such as frames, straps, etc. are often added to improve the reliability of the cooperating components. On the one hand, however, since the structural design of modern automobiles tends to be fixed, the spatial layout reserved for batteries is very limited, and the adoption of additional connecting components can occupy a part of the space inside the batteries, thereby increasing the space occupied by the whole batteries; on the other hand, the combination of the connecting members increases the manufacturing cost of the battery and further complicates the process. In addition, since there are many parts (e.g., bus bars) for electrically connecting with the battery cells inside the battery, when the parts are mounted on the battery cells, the wrong mounting of the parts to the positive and negative electrodes may cause a short circuit inside the battery cells, and once the battery is short-circuited, more serious safety accidents, such as the ignition of the battery or even the explosion of the battery, may occur.

Based on the above consideration, the applicant designs a battery cell, which includes an end cap, an electrode terminal, and a plug structure located on the outer surface of the end cap, wherein the plug structure is asymmetrically arranged about the center of the outer surface of the end cap. The plug structure can be used for being plugged with other components provided with corresponding matching structures so as to improve the assembly efficiency, and can prevent the other components from being installed outside the battery monomer in a wrong mode (such as a mode that the positions of the positive electrode and the negative electrode are opposite) so as to cause short circuit inside the battery and cause serious safety accidents such as battery ignition, battery explosion and the like.

The disclosed battery monomer of this application embodiment, this battery monomer is including being located the grafting structure of end cover surface, and this battery monomer can but not be used to in the electrical installation such as vehicle, boats and ships or aircraft. Particularly, in an electric device such as an electric vehicle or a hybrid electric vehicle, on one hand, due to the requirement for reliability of the battery, a plurality of connecting parts are generally provided, which causes the battery itself to occupy a larger volume in the electric device without changing the capacity, which causes an increase in space cost in the electric device, and also causes a troublesome assembly step; on the other hand, when the electric devices of this kind are installed incorrectly (for example, the assembly of the positive and negative electrodes of the battery cell is incorrect), the battery is easily short-circuited internally, thereby causing serious safety accidents such as vehicle fire and vehicle explosion. Therefore, the power supply system of the electric device can be formed by the battery monomer, the battery module, the battery pack and the like, so that the installation space of the whole battery is saved, the steps of installing components in the battery are simplified, and the probability of safety accidents caused by errors in the assembly process of the battery is reduced.

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 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 10 and a battery cell 20, and 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 with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing 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, a plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole and be accommodated in the box 10.

Referring to fig. 3, fig. 3 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 a battery module or a battery pack. As shown in fig. 3, the battery cell 20 may include an end cap 21, a case 22, an electrode assembly 23, and other functional components. The case 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23 and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be formed in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. Without limitation, the housing 22 and the end cap 21 may be integrated, and specifically, the end cap 21 and the housing 22 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 22, the end cap 21 covers the housing 22. The case 22 may have various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, etc., and particularly, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. 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.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of an end cap 21 according to some embodiments of the present disclosure, and fig. 5 is a top view of fig. 4 along an X direction. The end cap 21 is a component included in a battery cell 20 provided in the embodiment of the present application. Such a battery cell 20 may be used in a battery 100, the battery 100 being provided with a first plate, the battery cell 20 being adapted to cooperate with the first plate. The battery cell 20 includes an end cap 21. As shown in fig. 4, the end cap 21 includes at least one electrode terminal 211 (e.g., a first electrode terminal 211a and a second electrode terminal 211b shown in the figure), and a plug structure 212 (e.g., a protrusion shown in the figure) disposed on an outer surface of the end cap 21. Wherein, the plug structure 212 is used for plugging with the first plate, the end cover 21 is overlooked along the thickness direction X of the end cover 21, as shown in fig. 5, the projection of the plug structure 212 is dislocated with the projection of the electrode terminal 211, and the plug structure 212 is located at the center O of the outer surface of the end cover 21₁And (4) the asymmetric arrangement.

The first plate refers to a component that can be mounted on the battery cell 20 in an inserting manner, and in the embodiment of the present application, the first plate may be one or more of a harness isolation plate, an end plate, a bottom plate, a side plate, an end cover patch, and the like on the battery 100. Without limitation, the first plate may be considered to be a part of a matching component, such as a part of the wiring harness isolation plate, a part of the end plate, a part of the bottom plate, a part of the side plate, or a part of the end cover patch, so that the wiring harness isolation plate, the end plate, the bottom plate, the side plate, or the end cover patch needs to be simultaneously matched with the plug-in structures on the plurality of battery cells 20 to be correctly installed in the battery 100, and thus, whether the battery cells 20 are correctly installed may also be checked.

Referring to fig. 6 and 7, fig. 6 is an exploded structural view of an end cap 21 and an end cap patch 30 in a battery cell 20 provided in an embodiment of the present application, and fig. 7 is an exploded structural view of the battery cell 20 and a wire harness isolation plate 40 provided in an embodiment of the present application. In the embodiment shown in fig. 6, the first plate is the end cap patch 30, which is provided with mating structures, such as grooves 212b, for mating with mating structures (such as the protrusions 212a shown in the figure) on the end cap 21. In the embodiment shown in fig. 7, the first plate is a part of the harness isolation plate 40, and is provided with a matching structure, such as an avoiding hole 212c, for plugging with a plugging structure (such as a protrusion 212a shown in the figure) on the end cover 21 of the battery unit 20.

The end cap 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 21 may be provided with functional components such as the electrode terminal 211. The electrode terminal 211 may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20. Specifically, the electrode terminal 211 is mounted on the end cap 21, and without limitation, a portion of the electrode terminal 211 may protrude from the end cap 21. In some embodiments, the end cap 21 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The electrode terminal 211 is a functional part for accomplishing the electrical connection of the internal part and the external other parts of the battery cell 20. The electrode terminal 211 may be composed of a single member, or may be composed of a plurality of members in combination, without limitation. The electrode terminal 211 may be provided with a conductive portion, which may be composed of a material having good conductivity, including silver, copper, aluminum, etc., and an insulating portion, which may be made of a material having good insulating properties, such as plastic, rubber, etc. Without limitation, the number of the electrode terminals 211 may be one or more.

The mating structure 212 refers to a structure that can be mated in a mating manner, such as a protrusion and a recess that are appropriately shaped and sized to allow the protrusion and the recess to be located on the mating two components, respectively. In the embodiment of the present application, the insertion structure 212 on the outer surface of the end cover 21 is used for inserting the first plate, specifically, a protrusion may be provided on the outer surface of the end cover 21, and correspondingly, a groove corresponding to the shape and size of the protrusion is provided on the first plate, and in use, the protrusion on the end cover 21 is inserted into the groove on the first plate to realize the insertion. Without limitation, a groove may be formed on the outer surface of the end cap 21, and correspondingly, a protrusion matching the shape of the groove is formed on the first plate, and when in use, the protrusion on the first plate is inserted into the groove on the end cap 21 to realize plugging. Furthermore, a plurality of pairs of corresponding plug-in structures 212 may be provided on the end cap 21 and the first plate to enable plugging. Without limitation, the plug structure 212 may be formed integrally with the end cap 21 or the first plate on which it is located, or the plug structure 212 and the end cap 21 or the first plate on which it is located may be provided separately, and when in use, the plug structure 212 is fixed to the corresponding end cap 21 or the first plate by welding, riveting, or the like. When the plugging structure 212 is used for plugging with the first plate, the displacement of the first plate in the plane perpendicular to the plugging direction is limited, and when the displacement of the first plate relative to the battery cell 20 in the plane perpendicular to the plugging direction changes or has a tendency to change, the battery cell 20 can transmit the force for limiting the displacement to the first plate through the matched plugging structure 212. Thus, the relative displacement between the battery cell 20 and the first plate can be limited within a certain range of displacement by inserting the battery cell 20 and the first plate, and the reliability of the whole battery 100 is improved.

The projection of the plug-in structure 212 is misaligned with the projection of the electrode terminal 211 in the thickness direction X of the end cap. Specifically, the insertion structure 212 is provided at a position shifted from the electrode terminal 211 on the outer surface of the end cap 21. In this way, the insertion structure 212 may be made not to overlap or overlap the electrode terminal 211 position, thereby not affecting the electrical connection of the electrode terminal 211; the overall height of the battery cell 20 after mating with the first plate may also be reduced to reduce the space occupied inside the battery 100.

"center O of plug structure 212 with respect to the outer surface of the end cap₁By asymmetrically disposed is meant that the plug-in structures 212 are centered O about the outer surface of the end cap 21 in terms of location, number and shape₁And (4) the asymmetric arrangement. For example, when the number of the plug structures 212 of the outer surface of the end cap 21 is one, the projection shape of the plug structures 212 (e.g., grooves or projections) in the direction X of the thickness of the end cap 21 is about the center O of the outer surface of the end cap 21₁Is asymmetrical, the inserting structure 212 covers the center O of the outer surface of the end cover 21₁The arrow shape of (a), or other asymmetric shapes; it can also mean that the projection center of the plug-in structure 212 (such as a groove or a protrusion) along the direction X of the thickness of the end cover 21 is located at the center O of the outer surface of the end cover 21₁The other region. Alternatively, in some embodiments, when the number of the plug structures 212 on the outer surface of the end cover 21 is plural, the shape of plural projections of the plug structures 212 (e.g., grooves or protrusions) in the direction X of the thickness of the end cover 21 is about the center O of the outer surface of the end cover 21₁Is asymmetric; it can also mean that the center of the projections of the plug-in structures 212, such as grooves or projections, in the direction of the end cap thickness, is relative to the center O of the outer surface of the end cap 21₁An asymmetric distribution. Therefore, the single battery 20 and the first plate can be inserted in a specific direction only, and the opposite direction of the single battery 20 and the first plate, particularly the opposite direction of the positive electrode and the negative electrode, can be avoided, so that the occurrence probability of battery faults can be reduced, and the assembly efficiency and the reliability of the battery 100 can be improved. Further, it will be understood by those skilled in the art that the plug structure 212 is centered with respect to the center O of the outer surface of the end cap 21₁Asymmetric arrangements, including any combination of the above.

The embodiment of the application discloses a battery cell 20. The battery cell 20 is used in the battery 100, the battery 100 is provided with a first plate, the battery cell 20 is used for matching with the first plate, and the battery cell 20 comprises an end cover 21, at least one electrode terminal 211 and a plug structure 212 positioned on the outer surface of the end cover 21. Wherein, the plug structure 212 is used for plugging with the first plate to limit the first plate, along the thickness direction X of the end cover 21, the projection and electricity of the plug structure 212The projections of the pole terminals 211 are offset and the plug-in structures 212 are centered with respect to the center O of the outer surface of the end cap 21₁And (4) the asymmetric arrangement. In this way, the battery cell 20 may be enabled to be fitted with one or more of the harness partition plate, the end plate, the bottom plate, or the side plate on the battery 100, reliability of the battery 100 may be improved, and the battery cell 20 and the first plate may be prevented from being mounted in the battery 100 in a wrong manner with respect to the mounting position, thereby improving assembly efficiency of the battery 100 and improving safety performance of the battery 100.

According to an embodiment of the present application, referring to fig. 8, optionally, fig. 8 is a schematic structural diagram of an end cap 21 in a battery cell 20 provided in some embodiments of the present application. At least one of the electrode terminals 211 comprises a first electrode terminal 211a and a second electrode terminal 211b with opposite polarities, and projections of the first electrode terminal 211a, the second electrode terminal 211b and the plug-in structure 212 (such as a projection shown in the figure) are about a center O of the plug-in structure along a thickness direction X of the end cap₂₁₂An asymmetric distribution.

At least one of the electrode terminals 211 includes a first electrode terminal 211a and a second electrode terminal 211b having opposite polarities. Alternatively, the first electrode terminal 211a may be a positive electrode of the battery cell 20, and correspondingly, the second electrode terminal 211b may be a negative electrode of the battery cell 20; the first electrode terminal 211a may be a negative electrode of the battery cell 20, and correspondingly, the second electrode terminal 211b may be a positive electrode of the battery cell 20. Alternatively, the first and

second electrode terminals

211a and 211b may be made of copper and aluminum, respectively, and may be the same or different protrusion heights at the outer surface of the end cap 21.

Projections of the first electrode terminal 211a, the second electrode terminal 211b and the plug-in structure 212 on the outer surface of the end cap with respect to the center O of the plug-in structure 212 in the thickness direction X of the end cap 21₂₁₂An asymmetric distribution. Specifically, without considering the shape of the projection of the first electrode terminal 211a, the second electrode terminal 211b, and the insertion structure 212, the center of projection of the first electrode terminal 211a and the center of projection of the second electrode terminal 211b may be made with respect to the center of projection O of the insertion structure 212₂₁₂The asymmetric distribution, for example, may be such that the center of projection of the first electrode terminal 211a is aligned withThe distance of the projection center of the plug-in structure 212 is different from the distance of the projection center of the second electrode terminal 211b from the projection center of the plug-in structure 212. Alternatively, the distance between the projection center of the first electrode terminal 211a and the projection center of the plug-in structure 212 and the distance between the projection center of the second electrode terminal 211b and the projection center of the plug-in structure 212 may be the same, and the projection of the plug-in structure 212 may have an asymmetric shape. In the latter case, for example, the plugging structure 212 may have an arrow shape facing the first electrode terminal 211a or the second electrode terminal 211b, or an arc shape having an intrados facing the first electrode terminal 211a or the second electrode terminal 211b, or other asymmetric shapes.

At least one electrode terminal 211 comprises a first electrode terminal 211a and a second electrode terminal 211b with opposite polarities, and the projection of the first electrode terminal 211a, the second electrode terminal 211b and the plug-in structure 212 can be enabled to be related to the projection center O of the plug-in structure along the thickness direction X of the end cover₂₁₂An asymmetric distribution. Therefore, the probability of assembly errors of the battery 100 in assembly, particularly assembly errors of the positive electrode and the negative electrode can be reduced, and the safety performance of the battery 100 can be improved while the assembly efficiency is improved.

According to an embodiment of the present application, optionally, with continued reference to fig. 8, the minimum width D of the plug-in structure 212 (e.g., the protrusion shown in the figures) is greater than or equal to 5 mm. In a projection of the insertion structure 212 in the thickness direction X of the end cap, a distance between two points farthest in any direction is referred to as a "width". The "minimum width D" is then the minimum of the widths. For example, when the plug structure 212 is circular, the width is the diameter of the circle; when the plug structure 212 is square, the width is the side length of the square; when the inserting structure 212 is an equilateral triangle, the width is the height of the equilateral triangle; when the plugging structure 212 is a rhombus, the width is the height of the rhombus; when the plug structure 212 is oval, the width is the minor axis length of the oval. In this way, the plug structure 212 can have high strength and rigidity to realize plugging and is not easy to bend or break under stress when limiting the displacement of the first plate.

According to an embodiment of the present application, optionally, referring to fig. 8, the minimum distance L of the plugging structure 212 (e.g., the protrusion shown in the figure) from the edge of the end cap 21 is greater than or equal to 3 mm. The "minimum distance L" is the minimum distance between the projection of the insertion structure 212 in the thickness direction X of the end cover 21 and the edge of the end cover 21. In this way, by making the minimum distance between the plug structure 212 and the edge of the end cover 21 greater than the predetermined value, the plug structure 212 can be prevented from affecting the welding operation of the end cover 21, such as welding of the electrode terminals 211 (e.g., the first electrode terminal 211a and the second electrode terminal 211b) on the end cover 21 and the interposer, sealing welding of the end cover patch, and the like during the assembly of the battery cell 20. In addition, damage to the plug structure 212 by heat generated during the above-described welding process can also be avoided.

According to one embodiment of the present application, and referring optionally to fig. 9, fig. 9 provides an isometric view of an end cap 21 in a battery cell 20 according to other embodiments of the present application. The plugging structure 212 includes a protrusion 212a for engaging with the groove on the first plate to restrain the first plate, and the cap 21 is further provided with a liquid injection hole 213, the liquid injection hole 213 being closer to the first electrode terminal 211a than to the second electrode terminal 211b, the protrusion 212a being located between the liquid injection hole 213 and the first electrode terminal 211 a.

The outer surface of the end cover 21 may be provided with a protrusion 212a protruding from the outer surface of the end cover 21 in the thickness direction X of the end cover, preferably, the protrusion 212a may be cylindrical, and the protrusion 212a may be formed by a process such as stamping, turning, and the like. Thus, the battery pack is convenient to process and easy to form, and does not occupy the internal space of the battery cell 20. Correspondingly, a recess adapted to the shape and size of the protrusion 212a may be provided on the first plate. The battery cell 20 is inserted into the groove by inserting the protrusion 212a into the groove, so that the displacement of the first plate can be limited.

The end cap 21 may further be provided with a liquid injection hole 213, the liquid injection hole 213 may be used to inject the electrolyte into the battery cell 20, and the liquid injection hole 213 may have any shape and size, and may be specifically designed according to the liquid injection requirement of the battery cell 20. Without limitation, the pour hole 213 may be located closer to the first electrode terminal 211a than the second electrode terminal 211b, i.e., the distance between the pour hole 213 and the first electrode terminal 211a may be smaller than the distance between the pour hole 213 and the second electrode terminal 211 b. The protrusion 212a may be provided between the liquid inlet 213 and the first electrode terminal 211a, and the center of the protrusion 212a may be located on the line connecting the center of the liquid inlet 213 and the center of the first electrode terminal 211 a. Like this, in the notes liquid in-process of battery monomer 20, when electrolyte by annotate liquid hole 213 department splash and go out, protruding 212a can play the effect of stopping to a certain extent, blocks when annotating liquid on liquid splash to first electrode terminal 211a, avoids because electrolyte splash causes the corruption to first electrode terminal 211a, has promoted the security of battery. Without limitation, the protrusion 212a may be provided between the liquid inlet 213 and the second electrode terminal 211 b.

According to an embodiment of the present application, optionally, referring to fig. 10, fig. 10 is a front view of the end cap 21 shown in fig. 9. The height H of the projection 212a in the thickness direction X of the end cap 21₁Is less than or equal to the height H of the first electrode terminal 211a₂. On one hand, when the first plate is inserted into the battery cell 20, the overlap ratio between the thickness of the first plate and the height of the first electrode terminal 211a along the thickness direction X of the end cap is relatively high, which is helpful for reducing the overall height of the first plate after the first plate is matched with the battery cell 20, so as to reduce the occupation of the internal space of the battery 100. On the other hand, it is also possible to avoid interference with the electrical connection of the first electrode terminal 211a and other components (such as the bus bar).

According to an embodiment of the present application, optionally, referring to FIG. 10, the height H of the protrusions 212a is along the thickness direction X of the end cap₁Greater than or equal to 0.5 mm. Thus, on the one hand, it is possible to avoid that the height of the protrusion 212a is too small to affect the reliability of the protrusion 212a for fitting with the groove, so that the protrusion 212a and the groove fitted with each other are not easily failed. On the other hand, when the height of the protrusion 212a is too small, the situation that the plug is not fit in place is also easy to occur, for example, the protrusion 212a is not inserted into the groove and abuts on the outer surface of the end cover 21, when the height of the protrusion 212a is too small, the wrong assembly mode is less easily perceived, so that the height of the protrusion 212a is too smallThe height is greater than or equal to 0.5mm, so that the probability of occurrence of such erroneous assembly can be reduced, and the safety performance of the battery 100 can be improved.

According to an embodiment of the present application, optionally, referring to fig. 11, fig. 11 is a schematic structural diagram of a battery cell in some embodiments of the present application. As shown in fig. 11, the end cap 21 includes a first end cap 21a and a second end cap 21b respectively located at two ends of the battery cell 20, the first end cap 21a is provided with a first electrode terminal 211a, the second end cap 21b is provided with a second electrode terminal 211b, and a plug-in structure 212 (e.g., a protrusion in the figure) is disposed on the first end cap 21 a.

The first end cap 21a and the second end cap 21b are respectively located at two ends of the battery cell 20, specifically, the housing 22 may have a structure with openings at two ends, and the openings at two ends form an internal environment of the battery cell 20 in a manner that the end caps 21 cover the openings, for example, when the battery cell 20 is cylindrical, openings may be provided at two ends of the housing 22 along an axial direction of the cylinder, and the first end cap 21a and the second end cap 21b are respectively covered at the openings at two ends. For example, when the battery cell 20 has a rectangular parallelepiped shape, the openings may be provided on the two opposing surfaces of the case 22, and the first end cap 21a and the second end cap 21b may be fitted to the openings on the two surfaces. When the first end cap 21a is provided with the first electrode terminal 211a and the second end cap 21b is provided with the second electrode terminal 211b, the plug-in structure 212 may be provided on the first end cap 21a, or the plug-in structure 212 may be provided on the second end cap 21 b. Of course, different plug structures 212, such as different shaped protrusions and grooves, different sized protrusions and grooves, etc., may be disposed on the two end caps, respectively. In this way, it is also possible to avoid an error in the mounting direction of the battery cells 20 and the first plate.

According to an embodiment of the present application, referring optionally to fig. 12, fig. 12 is a schematic structural view of a first end cap 21a in a battery cell 20 according to some embodiments of the present application. The first cap 21a further has a liquid inlet 213, the insertion structure is a protrusion 212a, and the protrusion 212a is disposed between the first electrode terminal 211a and the liquid inlet 213. As described above, when the pour hole 213 and the protrusion 212a are located on the same end cap, the protrusion 212a can be located between the electrode terminal 211 and the pour hole 213, so that the protrusion can have a certain shielding effect to shield the electrode terminal 211 when the electrolyte is splashed during the pouring process.

According to an embodiment of the present application, referring optionally to fig. 13, fig. 13 is a schematic structural diagram of a first end cap in a battery cell provided in some embodiments of the present application. The insertion structure 212 includes an arc-shaped projection 212a centered on the hole axis of the liquid pouring hole 213, and the projection of the projection may be crescent-shaped, for example. Thus, the arc-shaped protrusion 212a can achieve a larger shielding area of the injection hole 213 with the same protrusion volume, which helps to improve the effect of the protrusion for shielding the electrolyte from splashing to the electrode terminal. Without limitation, the projection of the protrusion 212a may also be a polygonal line, which also helps to improve the effect of shielding the electrolyte from splashing.

According to an embodiment of the present application, optionally, referring to fig. 14, fig. 14 is a partial enlarged view at a in fig. 7. As shown in fig. 14, the protrusion 212a may be provided with a snap structure 212d for limiting the displacement of the first plate along the plugging direction when plugging. For example, as shown in the figures, the snap feature 212d may be a flange along the top of the protrusion 212a, and correspondingly, a mating feature may be provided at a corresponding location on the first plate. The structure on the first plate that mates with the snap structure 212d can be, for example, a protrusion in a recess or relief hole that mates with a flange, the protrusion protruding toward the center of the recess or relief hole. Thus, when the end cover 21 is in plug fit with the first plate, the protrusion on the first plate can be clamped below the flange on the end cover 21, so that when the displacement of the first plate relative to the battery cell 20 changes or there is a tendency to change, the force for restricting the displacement can be transmitted to the first plate by the cooperation of the protrusion on the first plate and the flange on the end cover 21, and the reliability of the whole battery 100 is improved.

The present application also discloses a battery 100 comprising a battery cell 20 and a first plate (e.g., an end cap patch, a cover plate, a wire harness isolation plate, etc.), wherein the battery cell 20 is plugged with the first plate. Specifically, the battery cell 20 is provided with the plug structure 212, and a protrusion or a groove corresponding to the plug structure 212 is provided on the first plate at a position corresponding to the plug structure 212, so that the first plate can be mounted on the end of the battery cell 20. For example, when the plug structure 212 on the battery cell 20 is a protrusion, a groove matching with the protrusion may be correspondingly provided on the first plate. Alternatively, when the insertion structure 212 of the battery cell 20 is a groove, a protrusion matching with the groove may be correspondingly provided on the first plate. In addition, the application also discloses an electric device 1000 comprising the battery 100.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled 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 invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. A battery cell for a battery, the battery including a first plate, the battery cell comprising:

an end cover, at least one electrode terminal and an inserting structure arranged on the outer surface of the end cover, wherein the inserting structure is used for inserting the first plate,

the projection of the plug-in structure is staggered with the projection of the electrode terminal along the thickness direction of the end cover, and the projection of the plug-in structure is asymmetrically arranged relative to the center of the outer surface of the end cover.

2. The battery cell as recited in claim 1, wherein the at least one electrode terminal comprises a first electrode terminal and a second electrode terminal with opposite polarities, and projections of the first electrode terminal, the second electrode terminal and the insertion structure are asymmetrically distributed about a center of the insertion structure along a thickness direction of the end cap.

3. The battery cell according to any of claims 1-2, wherein the minimum width of the plugging structure is greater than or equal to 5 mm.

4. The battery cell according to any of claims 1-2, wherein a minimum distance of an edge of the plug-in structure from an edge of the end cap is greater than or equal to 3 mm.

5. The battery cell as claimed in claim 2, wherein the insertion structure includes a protrusion for engaging with a groove on the first plate to restrain the first plate, the end cap further includes a liquid injection hole, the liquid injection hole is closer to the first electrode terminal than to the second electrode terminal, and the protrusion is located between the liquid injection hole and the first electrode terminal.

6. The battery cell according to claim 5, wherein the height of the protrusion is less than or equal to the height of the first electrode terminal in the thickness direction of the end cap.

7. The battery cell as recited in claim 6, wherein the height of the protrusion is greater than or equal to 0.5mm in the thickness direction of the end cap.

8. The battery cell as claimed in claim 1, wherein the end cap comprises a first end cap and a second end cap respectively located at two ends of the battery cell, the first end cap is provided with a first electrode terminal, the second end cap is provided with a second electrode terminal, and the insertion structure is disposed on the first end cap.

9. The battery cell as claimed in claim 8, wherein the first end cap further has a liquid injection hole, and the insertion structure is a protrusion disposed between the first electrode terminal and the liquid injection hole.

10. The battery cell as recited in claim 5, wherein the protrusion includes an arc-shaped protrusion centered on a hole axis of the injection hole, the arc-shaped protrusion being configured to prevent the electrolyte from being splashed onto the first electrode terminal during injection.

11. The battery cell as claimed in claim 5, wherein the protrusion is provided with a snap structure for limiting displacement of the first plate along the plugging direction when plugging.

12. A battery, comprising:

the battery cell of any one of claims 1-11; and

the first plate is arranged at the end part of the battery monomer, and a protrusion or a groove used for being matched with the plug-in structure is arranged at the position, corresponding to the plug-in structure, of the first plate.

13. An electrical consumer, characterized in that the consumer comprises a battery according to claim 12 for providing electrical energy.