CN220895742U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery and an electric device. The battery comprises a battery monomer, a first box body, a second box body and a connecting piece. The first box body comprises a first connecting plate, the first connecting plate is provided with a penetrating part, and the penetrating part penetrates through the first connecting plate along the thickness direction of the first connecting plate. The second box body and the first box body are mutually covered and jointly define an accommodating space, and the battery unit is arranged in the accommodating space. The second box includes the second connecting plate, and second connecting plate and first connecting plate range upon range of setting along the thickness direction. The connecting piece comprises a head part and a rod part, wherein the head part is arranged on one side of the first connecting plate, which is away from the second connecting plate, and the rod part extends from the head part, passes through the penetrating part and is in friction welding with the second connecting plate. In the battery provided by the application, the penetrating part can provide a yielding space for the connecting piece, so that the assembly difficulty between the first box body and the second box body is reduced, the assembly efficiency between the first box body and the second box body is improved, and the production efficiency of the battery is further improved.

Description

Battery and electricity utilization device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery and an electric device.

Background

With the development of new energy technology, the application of batteries is wider. For example, batteries are widely used not only in energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also in electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and in various fields such as military equipment and aerospace.

In a battery, a box body is used as an important part of the battery, and the assembly difficulty and the assembly efficiency of the box body directly influence the production efficiency of the battery, so that how to reduce the assembly difficulty of the battery box body and improve the assembly efficiency of the battery box body is a problem to be solved in the battery technology.

Disclosure of utility model

The embodiment of the application provides a battery and an electric device, which are used for reducing the assembly difficulty of a box body of the battery and improving the assembly efficiency of the battery.

According to a first aspect of the present application, there is provided a battery comprising: a battery cell; the first box body comprises a first connecting plate, the first connecting plate is provided with a penetrating part, and the penetrating part penetrates through the first connecting plate along the thickness direction of the first connecting plate; the second box body is mutually covered with the first box body, and jointly defines an accommodating space, and the battery unit is arranged in the accommodating space; the second box body comprises a second connecting plate, and the second connecting plate and the first connecting plate are stacked along the thickness direction; and the connecting piece comprises a head part and a rod part, the head part is arranged on one side of the first connecting plate, which is away from the second connecting plate, and the rod part extends from the head part, passes through the penetrating part and is in friction welding with the second connecting plate.

The battery provided by the embodiment of the application comprises a first box body and a second box body, wherein the first box body comprises a first connecting plate, the first connecting plate is provided with a penetrating part penetrating through the first connecting plate along the thickness direction of the first connecting plate, the second box body comprises a second connecting plate, and the second connecting plate and the first connecting plate are overlapped along the thickness direction. When utilizing the connecting piece to connect first connecting plate and second connecting plate, the portion of penetrating can provide the space of stepping down for the connecting piece, and the pole portion of connecting piece can directly pass the portion of penetrating and friction welding in the second connecting plate, and the connecting piece need not bore first connecting plate, has reduced the equipment degree of difficulty between first box and the second box, has improved the packaging efficiency between first box and the second box, and then has improved the production efficiency of battery.

Optionally, the battery further comprises: and the sealing piece is arranged between the first connecting plate and the second connecting plate and surrounds the rod part.

The sealing member can fill the gap between the first connecting plate and the second connecting plate, improves the sealing effect between the first box and the second box to improve the gas tightness of battery package. The embodiment of the application is beneficial to improving the waterproof performance of the battery, thereby improving the reliability of the battery.

Optionally, the first connection plate includes a first inner plate face facing the second connection plate, and the second connection plate includes a second inner plate face facing the first connection plate; the sealing member comprises a sealing colloid arranged on at least one of the first inner plate surface and the second inner plate surface.

According to the embodiment of the application, the sealing colloid is used for forming the sealing element, and when the sealing colloid is assembled, the sealing colloid is coated on the first inner plate surface and/or the second inner plate surface in advance, so that the positioning problem of the sealing element is not needed to be considered, and the coating mode of the sealing colloid is simple, thereby being beneficial to improving the assembly efficiency. On the other hand, the sealant has better ductility, can fill gaps with various shapes and sizes after being extruded, and has better sealing effect. Because the sealant has better ductility, a better sealing effect can be generated by using a small amount of sealant, and the thickness of a sealing piece formed after solidification can be reduced, so that the assembly gap between the first box body and the second box body is reduced, and the appearance effect is improved.

Optionally, the projection of the sealant in the preset reference plane and the projection of the penetrating part in the preset reference plane are not overlapped, and the preset reference plane is perpendicular to the thickness direction. Therefore, the sealing colloid cannot overflow to the outside of the first connecting plate through the penetrating part to influence the appearance or pollute the pressing tool connected with the connecting piece.

Optionally, the battery further comprises: the glue blocking ring is arranged between the first connecting plate and the second connecting plate and surrounds the rod part; the sealing colloid is positioned at the peripheral side of the colloid blocking ring.

According to the embodiment of the application, the glue blocking ring is arranged between the rod part and the sealing glue body, so that the sealing glue body can be prevented from extending and deforming towards the penetrating part, and the possibility of glue overflowing from the penetrating part is reduced. And moreover, the glue blocking ring can further promote the sealing colloid to extend and deform towards the radial outer side of the penetrating part, so that more gaps between the first connecting plate and the second connecting plate are filled, and the sealing effect of the sealing element is further improved.

Optionally, the projection of the glue blocking ring in the preset reference plane is provided with an inner contour line and an outer contour line; the inner contour line is in the projection of the penetrating part in the preset reference plane, and the projection of the penetrating part in the preset reference plane is in the area surrounded by the outer contour line.

In the friction welding process of the rod part and the second connecting plate, one part of the glue blocking ring is clamped between the first inner plate surface and the second inner plate surface, the other part of the glue blocking ring can be in contact with or fixedly connected with a friction welding part formed between the connecting piece and the second connecting plate, and structural stability is improved on the basis of keeping good blocking sealing colloid.

Optionally, the second connecting plate is steel with the tensile strength of 590-1500 MPa. The high-strength steel with the tensile strength of 590-1500 MPa has higher structural strength, is not easy to deform when being impacted externally, and the connection strength of the first box body and the second box body can be improved by adopting the second connecting plate made of steel, so that the battery monomer is protected, and the safety risk is reduced.

Optionally, the first connecting plate includes first interior face and the first outer face of setting relatively along the thickness direction, and the second connecting plate includes second interior face and the second outer face of setting relatively along the thickness direction, and at least one in face in first interior face, the first outer face, the second is equipped with the insulating layer in face and the second outer face. The insulating layer reduces the risk of short circuits and can improve the reliability of the battery.

Optionally, the first box body further includes a first bottom plate and at least one first side plate, where the at least one first side plate is connected to the first bottom plate and encloses with the first bottom plate to form a first cavity, and the first cavity includes a first opening opposite to the first bottom plate; the first connecting plate is located on the peripheral side of at least part of the edge of the first opening. The first connecting plate does not occupy the space in the first cavity, the molding process is simple, and the assembly connection between the first box body and the second box body is convenient.

Optionally, the second box body further includes a second bottom plate and at least one second side plate, where the at least one second side plate is connected to the second bottom plate and encloses with the second bottom plate to form a second cavity, and the second cavity has a second opening opposite to the second bottom plate; the second connecting plate is positioned on the peripheral side of at least part of the edge of the second opening. The second connecting plate does not occupy the space in the second cavity, and the forming process is simple, and the assembly connection between the first box and the second box is convenient.

Optionally, the battery further comprises: the sealing piece is arranged between the first connecting plate and the second connecting plate; the first connecting plate, the second connecting plate and the sealing piece are all of annular structures. The annular sealing piece is convenient to assemble, and can seal the interface of any position between the first connecting plate and the second connecting plate, so that the sealing effect is improved.

Optionally, the number of penetrating parts and connecting pieces is a plurality of, and the pole portion of each connecting piece passes corresponding one penetrating part and friction welding in the second connecting plate, has improved the fastness that first box and second box connect.

Optionally, the head extends radially outwardly from the stem, and a projection of the head in a predetermined reference plane covers a projection of the penetration in the predetermined reference plane, the predetermined reference plane being perpendicular to the thickness direction.

In the compression process of the connecting piece, the head part can be abutted against the plate surface, deviating from the second connecting plate, of the first connecting plate under the action of external pressure, so that the connecting strength of the connecting piece is improved.

According to a second aspect of the present application, there is also provided an electrical device comprising a battery according to any of the embodiments described above, the battery being adapted to provide electrical energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

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

Fig. 2 is a schematic structural diagram of a battery according to some embodiments of the present application.

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

Fig. 4 is a schematic side view of a battery according to some embodiments of the present application.

Fig. 5 is a schematic cross-sectional view of fig. 4 along the direction A-A.

Fig. 6 is an enlarged schematic view of the area B in fig. 5.

Fig. 7 is a schematic view of a projection structure of a portion of a battery according to an embodiment of the present application in a preset reference plane.

In the accompanying drawings:

The vehicle 1000, the battery 100, the controller 200, the motor 300, the battery cell 10, the first case 20, the first connection plate 21, the first bottom plate 22, the first side plate 23, the first cavity 24, the second case 30, the second connection plate 31, the second bottom plate 32, the second side plate 33, the second cavity 34, the connection member 40, the head 41, the stem 42, the accommodation space 50, the seal 61, the grommet 62, the penetration portion 211, the first inner plate 212, the first outer plate 213, the first opening 241, the second inner plate 312, the second outer plate 313, the second opening 341, the cavity 411, the inner contour 621, the outer contour 622, the thickness direction X, the reference plane a.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

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 "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, m and/or n may indicate: m alone, m and n simultaneously, and n alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In describing embodiments of the present application, the term "plurality" refers to more than two (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, 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 explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In embodiments of the present application, "parallel" includes not only the case of absolute parallelism, but also the case of substantially parallelism that is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering. Illustratively, the angle between the two directions is 85 ° -90 °, which can be considered to be perpendicular; the included angle between the two directions is 0-5 degrees, and the two directions can be considered to be parallel.

In the embodiment of the application, the battery cell can be a secondary battery cell, and the secondary battery cell refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., which is not limited by the embodiment of the application.

The battery cell generally includes an electrode assembly and a case. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and the present application is not particularly limited.

The battery according to the embodiment of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

With the development of new energy technology, the strength requirement of the battery on the box body is gradually improved. More and more batteries use high-strength steel as the base material of their cases. In addition, in order to improve the reliability of the battery, an insulating layer is generally provided on the case. In the assembly process of the battery, the battery monomer is required to be sealed and welded after being placed in the box body. The traditional welding mode mainly comprises friction plug rivet welding and spot welding, however, the tensile strength of the high-strength steel is too high, so that the traditional friction plug rivet welding cannot penetrate through the high-strength steel plate at all, and the traditional friction plug rivet welding is not applicable to the connection of the high-strength steel and the high-strength steel. Therefore, the parts of the traditional battery box body are made of various materials such as aluminum, steel and the like, and the structural strength of the box body is limited. Although the spot welding can be connected with high-strength steel, the spot welding is not suitable for the welding of the battery box body due to the arrangement of the insulating layer outside the box body.

In view of the above, an embodiment of the present application provides a battery including a battery cell, a first case, a second case, and a connection member. The first box includes first connecting plate, and first connecting plate is equipped with the penetrating part that runs through first connecting plate along its thickness direction, and the second box includes the second connecting plate, and second connecting plate and first connecting plate set up along thickness direction stack. When utilizing the connecting piece to connect first connecting plate and second connecting plate, the portion of penetrating can provide the space of stepping down for the connecting piece, and the pole portion of connecting piece can directly pass the portion of penetrating and friction welding in the second connecting plate, and the connecting piece need not bore first connecting plate, can reduce the equipment degree of difficulty between first box and the second box, improves the packaging efficiency between first box and the second box.

The battery disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system having the battery and the like disclosed by the application which constitute the power utilization device can be used, so that the assembly efficiency is favorably improved.

The embodiment of the application also provides an electric device using the 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 car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. Referring to fig. 1, a vehicle 1000 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended range vehicle, etc. The battery 100 is provided in the interior of 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 be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

An embodiment of the present application further provides a battery 100, fig. 2 is a schematic structural diagram of the battery 100 according to some embodiments of the present application, fig. 3 is a schematic exploded structural diagram of the battery 100 according to some embodiments of the present application, fig. 4 is a schematic structural diagram of a side view of the battery 100 according to some embodiments of the present application, fig. 5 is a schematic structural diagram of a cross-section of fig. 4 along a direction A-A, and fig. 6 is a schematic enlarged structural diagram of a region B in fig. 5. Referring to fig. 2 to 6, a battery 100 according to an embodiment of the present application includes a battery cell 10, a first case 20, a second case 30, and a connection member 40. The first casing 20 includes a first connection plate 21, the first connection plate 21 being provided with a penetration portion 211, the penetration portion 211 penetrating the first connection plate 21 in a thickness direction X of the first connection plate 21. The second case 30 and the first case 20 are mutually covered and jointly define an accommodating space 50, and the battery cells 10 are arranged in the accommodating space 50. The second case 30 includes a second connection plate 31, and the second connection plate 31 and the first connection plate 21 are stacked in the thickness direction X. The connector 40 comprises a head 41 provided on the side of the first connection plate 21 facing away from the second connection plate 31, and a stem 42 extending from the head 41 through the penetration 211 and friction welded to the second connection plate 31.

In the battery 100, the number of the battery cells 10 may be plural, and the plural battery cells 10 may be connected in series, parallel, or series-parallel, and series-parallel refers to both of the plural battery cells 10 being connected in series and parallel. The plurality of battery cells 10 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 10 is accommodated in the accommodating space 50; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 10 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the accommodating space 50. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 10.

Wherein each battery cell 10 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 10 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

At least one of the first casing 20 and the second casing 30 defines a receiving chamber. Illustratively, the first casing 20 defines a receiving chamber therein, and the second casing 30 has a plate-like structure, and when the first casing 20 and the second casing 30 are mutually covered, the receiving chamber in the first casing 20 is closed to form the receiving space 50. Or the second casing 30 defines a receiving chamber therein, and the first casing 20 has a plate-like structure, and when the first casing 20 and the second casing 30 are mutually covered, the receiving chamber in the second casing 30 is closed to form the receiving space 50. Or the first case 20 and the second case 30 are respectively defined with a receiving cavity, and when the first case 20 and the second case 30 are mutually covered, the receiving cavities in the first case 20 and the second case 30 together form a receiving space 50. The first casing 20 and the second casing 30 may be various shapes, such as a cylinder, a rectangular parallelepiped, etc.

The first casing 20 may be covered on top of the second casing 30, the first casing 20 may be referred to as an upper casing, and the second casing 30 may be referred to as a lower casing.

The side of the head 41 facing away from the stem 42 may be provided with a cavity 411 having a polygonal cross-section. During assembly, an external pressing tool can be connected to the cavity 411 of the connecting element 40 in a form-fitting manner via the pressing shaft, so that the connecting element 40 is moved. The pressing tool may be, for example, a drill capable of rotating at a high speed.

When the pressing tool applies pressure to the connection member 40, the rod portion 42 may pass through the penetration portion 211 to be in contact with the inner plate surface of the second connection plate 31 facing the first connection plate 21. By the rotation of the pressing tool and the application of pressure on the connection member 40, the rod portion 42 rubs against the second connection plate 31 to generate heat, thereby forming a friction welded portion between the rod portion 42 and the second connection plate 31, which, after curing, fixedly connects the rod portion 42 and the second connection plate 31. At the same time, the head 41 of the connecting element 40 can press the first connecting plate 21 on the side of the first connecting plate 21 facing away from the second connecting plate 31, so that the first connecting plate 21 and the second connecting plate 31 are fixedly connected.

The diameter of the stem 42 may be smaller than the size of the penetration 211, may be matched to the size of the penetration 211, or may be slightly larger than the size of the penetration 211.

The connecting member 40 may be a member suitable for friction welding. Illustratively, the connector 40 may be a rivet, steel nail, or the like.

The first connection plate 21 serves as a connection portion of the first casing 20, and may be disposed at one side of the first casing 20 adjacent to the second casing 30. The second connection plate 31 serves as a connection portion of the second casing 30, and may be disposed at a side of the second casing 30 adjacent to the first casing 20. After the first connection plate 21 and the second connection plate 31 are connected by the connection member 40, the first case 20 and the second case 30 form a unit covering the battery cell 10.

The penetrating portion 211 may be a through hole, and the shape of the through hole may include, but is not limited to, a regular shape such as a circle, a square, a polygon, and the like, and may also include an irregular shape.

The thickness direction of the second connection plate 31 may be the same as the thickness direction of the first connection plate 21, and both are the thickness direction X, so that the first connection plate 21 and the second connection plate 31 are stacked in the thickness direction X.

The first and second connection plates 21 and 31 may be of a flat plate structure. The flat plate structure is easy to form and is easy to connect by the connecting member 40.

The battery 100 provided in the embodiment of the present application includes a first case 20 and a second case 30. The first casing 20 includes a first connection plate 21, and the first connection plate 21 is provided with a penetration portion 211 penetrating the first connection plate 21 in a thickness direction thereof. The second casing 30 includes a second connection plate 31, and the second connection plate 31 and the first connection plate 21 are disposed in superposition in the thickness direction X. When the connecting piece 40 is used to connect the first connecting plate 21 and the second connecting plate 31, the penetrating part 211 can provide a yielding space for the connecting piece 40, and the rod part 42 of the connecting piece 40 can directly penetrate through the penetrating part 211 and be welded to the second connecting plate 31 in a friction manner, so that the welding process is simple, and the assembly efficiency is improved. More importantly, the connecting piece 40 does not need to drill through the first connecting plate 21, so that the assembly difficulty between the first box body 20 and the second box body 30 is reduced, the assembly efficiency between the first box body 20 and the second box body 30 is improved, and the production efficiency of the battery 100 is further improved.

Moreover, due to the arrangement of the penetrating portion 211, the first connecting plate 21 can be made of a material which is not easy to drill through by the connecting piece 40 such as high-strength steel, so that the limitation on the material of the first connecting plate 21 is reduced, and the improvement of the structural strength of the first box 20 is facilitated.

Since the first connection plate 21 and the second connection plate 31 are both hard plates and are subject to restrictions of the process, the contact surface between the first connection plate 21 and the second connection plate 31 may not be perfectly flat. Therefore, after the first connection plate 21 and the second connection plate 31 are connected, a gap may exist therebetween, resulting in poor waterproof performance of the battery 100.

In view of this, in some embodiments, the battery 100 further includes a seal 61, the seal 61 being disposed between the first and second connection plates 21, 31 and surrounding the stem 42.

The sealing member 61 can generate a certain degree of expansion deformation under the extrusion action between the first connecting plate 21 and the second connecting plate 31, so as to enhance the fitting action between the sealing member 61 and the first connecting plate 21 and the second connecting plate 31 and increase the contact area between the sealing member 61 and the first connecting plate 21 and the second connecting plate 31, thereby improving the sealing effect. Illustratively, the seal 61 may be a silicone pad, rubber pad, foam, sealant, or the like.

The sealing member 61 itself may be provided with a through hole through which the stem 42 of the connecting member 40 passes, so as to surround the circumferential side of the stem 42. The sealing member 61 may be provided without a through hole before the connecting member 40 is assembled to the first and second connection plates 21 and 31, and the sealing member 61 may be penetrated during the penetration of the connecting member 40 through the penetration portion 211 such that the sealing member 61 surrounds the circumferential side of the lever portion 42.

In the embodiment of the application, the sealing member 61 is arranged between the first connecting plate 21 and the second connecting plate 31, so that the sealing member 61 can fill the gap between the first connecting plate 21 and the second connecting plate 31, and the sealing effect between the first box body 20 and the second box body 30 is improved, thereby improving the air tightness of the package of the battery 100. The embodiment of the application is beneficial to improving the waterproof performance of the battery 100, thereby improving the reliability of the battery 100.

In some embodiments, the first connection plate 21 includes a first interior plate face 212 facing the second connection plate 31, and the second connection plate 31 includes a second interior plate face 312 facing the first connection plate 21. The seal 61 includes a sealing compound provided on at least one of the first inner panel 212 and the second inner panel 312.

Alternatively, the sealant may be cured from the sealant.

Alternatively, the sealing gel may be a solid gel, a liquid gel, or the like.

When the first and second cases 20 and 30 are assembled, the sealant may be applied to only the first inner plate surface 212, and the sealant of the first inner plate surface 212 is extruded to generate expansion deformation during the process of connecting the first and second connection plates 21 and 31 by the connection member 40, and the sealant is cured to form a sealant. Similarly, the sealant may be applied only to the second inner panel surface 312, or the sealant may be applied to both the first inner panel surface 212 and the second inner panel surface 312.

In the embodiment of the application, the sealing element 61 is formed by the sealing colloid, and the sealing colloid is coated on the first inner plate surface 212 and/or the second inner plate surface 312 in advance during assembly, so that the positioning problem of the sealing element 61 is not needed to be considered, and the coating mode of the sealing colloid is simple, thereby being beneficial to improving the assembly efficiency. On the other hand, the sealant has better ductility, can fill gaps with various shapes and sizes after being extruded, and has better sealing effect. Because the sealant has better ductility, a better sealing effect can be generated by using a small amount of sealant, and the thickness of the sealing piece 61 formed after curing can be reduced, so that the assembly gap between the first box 20 and the second box 30 is reduced, and the appearance effect is improved.

In some embodiments, the projection of the sealant in the predetermined reference plane a is not overlapped with the projection of the penetrating portion 211 in the predetermined reference plane a, and the predetermined reference plane a is perpendicular to the thickness direction X.

The second inner plate 312 has a region to be welded, and the projection of the region to be welded in the preset reference plane a and the projection of the penetrating portion 211 in the preset reference plane a overlap each other. The shank 42 may be friction welded to the region to be welded.

If the first inner plate surface 212 is coated with a sealing compound, the sealing compound avoids the penetrating portion 211. If the second inner plate surface 312 is coated with a sealing compound, the sealing compound avoids the area to be welded.

The projection of the sealing colloid in the preset reference plane a is set to be not overlapped with the projection of the penetrating part 211 in the preset reference plane a, and the sealing colloid cannot overflow to the outside of the first connecting plate 21 through the penetrating part 211 to influence the appearance or pollute the pressing tool connected with the connecting piece 40.

Because the sealing colloid has better ductility, the ductility direction of the sealing colloid is uncertain after the sealing colloid is extruded. To prevent the encapsulant from extending and deforming toward the penetration portion 211, in some embodiments, the battery 100 further includes an encapsulant ring 62, where the encapsulant ring 62 is disposed between the first and second connection plates 21 and 31 and surrounds the stem 42. The seal gel is located on the peripheral side of the gel blocking ring 62.

The stem 42, the glue retaining ring 62 and the sealant are arranged sequentially from inside to outside in the radial direction.

The glue retaining ring 62 may be a closed annular structure to block the sealing glue from deforming inwardly from all directions radially of the stem 42. Illustratively, the glue retaining ring 62 may be a regular circle, square, polygon, etc., or may be an irregular closed structure.

The glue blocking ring 62 can generate a certain extension deformation under the extrusion action of the first connecting plate 21 and the second connecting plate 31 so as to improve the tightness between the glue blocking ring and the first connecting plate 21 and the second connecting plate 31, thereby improving the effect of blocking the sealing glue.

Illustratively, the glue retaining ring 62 may be a silicone ring, a rubber ring, or the like.

According to the embodiment of the application, the glue blocking ring 62 is arranged between the rod part 42 and the sealing glue body, so that the sealing glue body can be prevented from extending and deforming towards the penetrating part 211, and the possibility of glue overflow from the penetrating part 211 is reduced. Moreover, the glue blocking ring 62 can also promote the sealing glue to extend and deform more towards the radial outer side of the penetrating part 211, so that more gaps between the first connecting plate 21 and the second connecting plate 31 are filled, and the sealing effect of the sealing piece 61 is further improved.

Fig. 7 is a schematic view of a projection structure of a portion of a battery according to an embodiment of the present application in a preset reference plane. In some embodiments, the projection of the glue collar 62 in the preset reference plane a has an inner contour 621 and an outer contour 622. The inner contour line 621 is in the projection of the penetration portion 211 in the preset reference plane a (refer to the cross-sectional line area shown in fig. 7), and the projection of the penetration portion 211 in the preset reference plane a is in the area surrounded by the outer contour line 622.

The outer contour 622 is outside the projection of the penetration 211 in the preset reference plane a.

The projection of the glue blocking ring 62 in the preset reference plane a partially coincides with the projection of the penetrating part 211 in the preset reference plane a.

The inner contour line 621 may be a projection of an inner circumferential wall of the glue collar 62 within the preset reference plane a, and the outer contour line 622 may be a projection of an outer circumferential wall of the glue collar 62 within the preset reference plane a.

Both the inner contour 621 and the outer contour 622 may be closed loop lines. Illustratively, both the inner contour 621 and the outer contour 622 may be circular, square, polygonal, etc.

The area surrounded by the inner contour 621 is in the projection of the penetrating portion 211 in the preset reference plane a. The distance between the edge of the penetrating portion 211 at any position of projection in the preset reference plane a and the inner contour line 621 is substantially the same. The distance between the edge of the penetrating portion 211 at any position of projection in the preset reference plane a and the outer contour line 622 is also substantially the same.

By the above-mentioned special arrangement of the relative positional relationship between the glue blocking ring 62 and the penetrating portion 211, during the friction welding process of the rod portion 42 and the second connecting plate 31, one part of the glue blocking ring 62 is clamped between the first inner plate surface 212 and the second inner plate surface 312, and the other part of the glue blocking ring 62 can be in contact with or fixedly connected with the friction welding portion formed between the connecting piece 40 and the second connecting plate 31, so that the structural stability is improved on the basis of keeping a better blocking sealing colloid.

In some embodiments, the base material of the first connection plate 21 and the base material of the second connection plate 31 may be the same. Therefore, the first connecting plate 21 and the second connecting plate 31 are conveniently connected in a friction welding mode, the influence caused by the material difference of the first connecting plate and the second connecting plate is not needed to be considered, and the material selecting time is saved.

Specifically, the base material of the first connection plate 21 and the base material of the second connection plate 31 may each be steel.

The tensile strength of the steel material used for the first connection plate 21 may be the same as or different from the tensile strength of the steel material used for the second connection plate 31.

In other embodiments, the base material of the first connection plate 21 and the base material of the second connection plate 31 may also be different. For example, the first connection plate 21 may be aluminum, the second connection plate 31 may be steel, or the like.

In some embodiments, the second connection plate 31 is steel with a tensile strength of 590MPa to 1500MPa.

That is, the second connection plate 31 may be high-strength steel.

According to the battery 100 provided by the embodiment of the application, the penetrating part 211 is formed on the first connecting plate 21, so that the second connecting plate 31 can be allowed to be made of high-strength steel with higher tensile strength, and the technical defect that the high-strength steel in the prior art is not suitable for being connected by adopting a friction plug rivet welding mode is overcome.

The high-strength steel with the tensile strength of 590-1500 MPa has higher structural strength, is not easy to deform when being impacted externally, and the second connecting plate 31 made of steel can improve the connection strength of the first box body 20 and the second box body 30, protect battery monomers and reduce the safety risk.

In some embodiments, referring to fig. 6, the first connection plate 21 includes a first inner plate surface 212 and a first outer plate surface 213 disposed opposite to each other in the thickness direction X, and the second connection plate 31 includes a second inner plate surface 312 and a second outer plate surface 313 disposed opposite to each other in the thickness direction X. At least one of the first inner plate surface 212, the first outer plate surface 213, the second inner plate surface 312, and the second outer plate surface 313 is provided with an insulating layer.

Optionally, to reduce the safety risk, insulating layers are disposed on the first inner plate 212, the first outer plate 213, the second inner plate 312, and the second outer plate 313.

According to the battery 100 provided by the embodiment of the application, the penetrating part 211 is formed on the first connecting plate 21, so that the first connecting plate 21 and the second connecting plate 31 can be allowed to be welded in a friction plug rivet welding mode, and the technical defect that a steel plate with an insulating layer (particularly a high-strength steel plate with an insulating layer) in the prior art cannot be connected in a spot welding and friction plug rivet welding mode is overcome.

According to the embodiment of the application, the insulating layer is arranged on at least one plate surface of the first connecting plate 21 and the second connecting plate 31, so that the risk of short circuit is reduced, and the reliability of the battery can be improved.

In some embodiments, referring to fig. 3, the first case 20 further includes a first bottom plate 22 and at least one first side plate 23, the at least one first side plate 23 being connected to the first bottom plate 22 and enclosing with the first bottom plate 22 to form a first cavity 24, the first cavity 24 including a first opening 241 disposed opposite the first bottom plate 22. The first connection plate 21 is located on the peripheral side of at least part of the edge of the first opening 241.

Alternatively, the first bottom plate 22 may be a square plate body, and the first side plate 23 may be a flat plate shape, the number of which is four. The first bottom plate 22 and the four first side plates 23 enclose a rectangular first cavity 24, and the first opening 241 is rectangular.

Alternatively, the first bottom plate 22 may be a circular plate body, and the number of the first side plates 23 may be one, and the shape thereof may be a cylinder. The first bottom plate 22 and the first side plate 23 enclose a cylindrical first cavity 24, and the first opening 241 is circular.

The number of the first connection plates 21 may be one, which extends radially outward of the first opening 241 from the circumferential edge of the first opening 241, in the shape of a ring-shaped flange.

The number of the first connection plates 21 may be plural, and the plural first connection plates 21 may extend radially outward of the first opening 241 from a part of the edge of the first opening 241 at intervals, and each first connection plate 21 may have a lug shape.

The first connecting plate 21, the first bottom plate 22 and the first side plate 23 may be made of the same material or different materials.

The first connecting plate 21, the first bottom plate 22 and the first side plate 23 may be formed separately and joined together by bonding, clamping, welding, fastening or other means. The first connection plate 21, the first bottom plate 22, and the first side plate 23 may be integrally formed.

In the embodiment of the application, the first connecting plate 21 is arranged on the peripheral side of at least part of the edge of the first opening 241, so that the space in the first cavity 24 is not occupied, the forming process is simple, and the assembly connection between the first box body 20 and the second box body 30 is convenient.

In some alternative embodiments, the first case 20 may also include a main board body, where the first connection board 21 is located on a peripheral side of the main board body, and the first connection board 21 and the main board body form a flat board surface. The first connection plate 21 may be integrally formed with the main plate body.

In some embodiments, the second box 30 further includes a second bottom plate 32 and at least one second side plate 33, where the at least one second side plate 33 is connected to the second bottom plate 32 and encloses with the second bottom plate 32 to form a second cavity 34, and the second cavity 34 has a second opening 341 disposed opposite to the second bottom plate 32. The second connection plate 31 is located at a peripheral side of at least a part of the edge of the second opening 341.

Alternatively, the second bottom plate 32 may be a square plate body, and the second side plate 33 may be a flat plate, four in number. The second bottom plate 32 and the four second side plates 33 enclose a rectangular second cavity 34, and the second opening 341 is rectangular.

Alternatively, the second bottom plate 32 may be a circular plate body, and the number of the second side plates 33 may be one, and the shape thereof may be a cylinder. The second bottom plate 32 and the second side plate 33 enclose a cylindrical second cavity 34, and the second opening 341 is circular.

The number of the second connection plates 31 may be one, which extends radially outward of the second opening 341 from the circumferential edge of the second opening 341, in the shape of a ring-shaped flange.

The number of the second connection plates 31 may be plural, and the plural second connection plates 31 may extend radially outward of the second opening 341 from a part of the edge of the second opening 341 at intervals, and each second connection plate 31 may be in a lug shape.

The materials of the second connecting plate 31, the second bottom plate 32 and the second side plate 33 may be the same or different.

The second connecting plate 31, the second bottom plate 32, and the second side plate 33 may be formed separately and attached together by bonding, clamping, welding, fastening, or other means. The second connection plate 31, the second bottom plate 32, and the second side plate 33 may be integrally formed.

In the embodiment of the application, the second connecting plate 31 is arranged on the peripheral side of at least part of the edge of the second opening 341, so that the space in the second cavity 34 is not occupied, the forming process is simple, and the assembly connection between the first box body 20 and the second box body 30 is convenient.

In some alternative embodiments, the second box 30 may also include a main board body, where the second connection board 31 is located on a peripheral side of the main board body, and the second connection board 31 forms a flat board surface with the main board body. The second connection plate 31 may be integrally formed with the main plate body.

It will be appreciated that at most one of the first and second cases 20 and 30 has a plate-like structure so as to form the receiving space 50 after the first and second cases 20 and 30 are closed.

In some embodiments, referring to fig. 3, battery 100 further includes a seal 61, seal 61 being disposed between first connection plate 21 and second connection plate 31. The first connection plate 21, the second connection plate 31 and the seal 61 are all in a ring-shaped structure.

The shapes of the first connection plate 21, the second connection plate 31 and the seal 61 are matched. Illustratively, the first connection plate 21, the second connection plate 31, and the seal 61 are each a circular ring-shaped plate body, a square ring-shaped plate body, an elliptical ring-shaped plate body, or the like.

The annular first and second connection plates 21 and 31 can equally connect the first and second cases 20 and 30 together, reducing the possibility of a gap between the first and second cases 20 and 30. The annular seal 61 facilitates assembly and seals the interface between the first web 21 and the second web 31 at any location to enhance the sealing effect.

In some embodiments, the number of penetrations 211 and connectors 40 is multiple, and the stem 42 of each connector 40 passes through a corresponding one of the penetrations 211 and is friction welded to the second connecting plate 31.

The plurality of penetrating portions 211 may be distributed on the first connecting plate 21 at intervals, and the spacing between any two adjacent penetrating portions 211 is the same. Accordingly, each penetrating portion 211 is penetrated by a connecting piece 40 for connecting the first connecting plate 21 and the second connecting plate 31, so as to improve the connection firmness of the first box 20 and the second box 30.

In some embodiments, the head 41 extends radially outward from the stem 42, and a projection of the head 41 into the predetermined reference plane a covers a projection of the penetration 211 into the predetermined reference plane a, the predetermined reference plane a being perpendicular to the thickness direction X.

The head 41 is formed into a cap shape by extending the stem 42 radially outwardly.

The head 41 and the stem 42 may be integrally formed.

After the rod portion 42 passes through the penetrating portion 211 and is friction welded to the second connecting plate 31, the head portion 41 may abut against a first outer plate surface of the first connecting plate 21 facing away from the second connecting plate 31, and press the first connecting plate 21 toward the second connecting plate 31, thereby connecting the first connecting plate 21 and the second connecting plate 31 together.

During compression of the connecting piece 40, the head 41 can abut against the outer plate surface of the first connecting plate 21 facing away from the second connecting plate 31 under the action of external pressure, so that the connection strength is improved.

According to a second aspect of the present application, there is also provided an electrical device, including a battery according to any of the above aspects, and the battery is configured to provide electrical energy to the electrical device.

The powered device may be any of the aforementioned devices or systems employing batteries.

In some embodiments, the present application provides a battery 100 including a battery cell 10, a first case 20, a second case 30, a connector 40, a seal 61, and a glue collar 62. The first casing 20 includes a first connection plate 21, the first connection plate 21 being provided with a penetration portion 211, the penetration portion 211 penetrating the first connection plate 21 in a thickness direction X of the first connection plate 21. The second case 30 and the first case 20 are mutually covered and jointly define an accommodating space 50, and the battery cells 10 are arranged in the accommodating space 50. The second case 30 includes a second connection plate 31, and the second connection plate 31 and the first connection plate 21 are stacked in the thickness direction X. The connecting member 40 includes a head 41 and a rod 42, the head 41 is disposed at a side of the first connecting plate 21 facing away from the second connecting plate 31, and the rod 42 extends from the head 41 through the penetration portion 211 and is friction-welded to the second connecting plate 31, thereby improving assembly efficiency between the first case 20 and the second case 30 and further improving production efficiency of the battery 100. The sealing member 61 and the glue retaining ring 62 are provided between the first connecting plate 21 and the second connecting plate 31 and surround the rod portion 42. The seal gel is located on the peripheral side of the gel blocking ring 62. The sealing member 61 can improve the sealing effect between the first casing 20 and the second casing 30, which is advantageous in improving the waterproof performance of the battery 100, thereby improving the reliability of the battery 100. The glue blocking ring 62 can block the sealing glue from extending and deforming towards the penetrating part 211, so that the possibility of glue overflow from the penetrating part 211 is reduced.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A battery, comprising:

a battery cell;

The first box body comprises a first connecting plate, wherein the first connecting plate is provided with a penetrating part, and the penetrating part penetrates through the first connecting plate along the thickness direction of the first connecting plate;

The second box body is mutually covered with the first box body and jointly defines an accommodating space, and the battery cells are arranged in the accommodating space; the second box body comprises a second connecting plate, and the second connecting plate and the first connecting plate are stacked along the thickness direction; and

The connecting piece comprises a head part and a rod part, wherein the head part is arranged on one side, away from the second connecting plate, of the first connecting plate, and the rod part extends from the head part, passes through the penetrating part and is in friction welding with the second connecting plate.

2. The battery of claim 1, wherein the battery further comprises:

and the sealing piece is arranged between the first connecting plate and the second connecting plate and surrounds the rod part.

3. The battery of claim 2, wherein the battery is configured to provide the battery with a plurality of cells,

The first connecting plate comprises a first inner plate surface facing the second connecting plate, and the second connecting plate comprises a second inner plate surface facing the first connecting plate;

The sealing element comprises a sealing colloid which is arranged on at least one of the first inner plate surface and the second inner plate surface.

4. The battery of claim 3, wherein the battery is provided with a battery cell,

The projection of the sealing colloid in a preset reference plane is not overlapped with the projection of the penetrating part in the preset reference plane, and the preset reference plane is perpendicular to the thickness direction.

5. The battery of claim 4, wherein the battery further comprises:

The glue blocking ring is arranged between the first connecting plate and the second connecting plate and surrounds the rod part;

the sealing colloid is positioned on the periphery of the colloid blocking ring.

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

The projection of the glue blocking ring in the preset reference plane is provided with an inner contour line and an outer contour line;

The inner contour line is in the projection of the penetrating part in the preset reference plane, and the projection of the penetrating part in the preset reference plane is in the area surrounded by the outer contour line.

7. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The second connecting plate is steel with the tensile strength of 590-1500 MPa.

8. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The first connecting plate comprises a first inner plate surface and a first outer plate surface which are oppositely arranged in the thickness direction, the second connecting plate comprises a second inner plate surface and a second outer plate surface which are oppositely arranged in the thickness direction, and at least one of the first inner plate surface, the first outer plate surface, the second inner plate surface and the second outer plate surface is provided with an insulating layer.

9. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The first box body further comprises a first bottom plate and at least one first side plate, the at least one first side plate is connected to the first bottom plate and is enclosed with the first bottom plate to form a first cavity, and the first cavity comprises a first opening opposite to the first bottom plate;

the first connecting plate is located on the peripheral side of at least part of the edge of the first opening.

10. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The second box body further comprises a second bottom plate and at least one second side plate, the at least one second side plate is connected to the second bottom plate and is enclosed with the second bottom plate to form a second cavity, and the second cavity is provided with a second opening opposite to the second bottom plate;

the second connecting plate is positioned on the peripheral side of at least part of the edge of the second opening.

11. The battery according to claim 9 or 10, characterized in that the battery further comprises:

A seal member provided between the first connection plate and the second connection plate;

The first connecting plate, the second connecting plate and the sealing piece are all in an annular structure.

12. The battery of claim 11, wherein the battery is configured to provide the battery with a battery cell,

The number of the penetrating parts and the number of the connecting pieces are multiple, and the rod part of each connecting piece penetrates through one corresponding penetrating part and is welded to the second connecting plate in a friction mode.

13. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The head extends radially outwardly from the stem, and a projection of the head in a predetermined reference plane covers a projection of the penetration in the predetermined reference plane, the predetermined reference plane being perpendicular to the thickness direction.

14. An electrical device comprising a battery according to any one of claims 1-13 for providing electrical energy.