CN216903164U - Battery and electric device - Google Patents

Abstract

The application discloses battery and electric device, the battery includes a plurality of battery monomer and the first mounting panel of arranging the setting along the first direction, first mounting panel sets up in the one end of a plurality of battery monomer along the first direction, a plurality of battery monomer are including the first battery monomer that is located the tip, and, first mounting panel is adjacent to with the first wall of first battery monomer, first battery monomer includes end cover and casing, the casing has the opening, the end cover closes this opening and is connected with the casing along the second direction lid, first wall includes this body portion and protruding portion, the protruding portion is located one side that this body portion is close to the end cover and along first direction salient in this body portion, along the second direction, at least part of protruding portion surpasss first mounting panel, the second direction is perpendicular with the first direction. The battery can reduce the probability of early failure of the first battery monomer and improve the overall reliability and safety.

Description

Battery and electric device

Technical Field

The present application relates to the field of batteries, and more particularly, to a battery and a power consumption device.

Background

With the economic development, battery technology is widely used in various fields, particularly in the field of vehicles such as electric automobiles. When the failure of the battery leads to the failure of the electric device, the personal safety of related users is easily threatened. Therefore, the reliability and safety of the battery are related to the personal safety of users, and are a very important research topic in the battery field.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and a power consumption device, which can improve the reliability and the safety of the battery in the use process.

In a first aspect, the present application provides a battery, which includes a plurality of battery cells arranged in a first direction, and a first mounting plate, where the plurality of battery cells include a first battery cell arranged at an end portion; the first mounting plate is arranged at one end of the plurality of battery cells along the first direction, and the first mounting plate is adjacent to the first wall of the first battery cell. The first battery cell comprises an end cover and a shell, the shell is provided with an opening, the end cover covers the opening along a second direction and is connected with the shell, the first wall comprises a body part and a protruding part, the protruding part is located on one side of the body part close to the end cover and protrudes out of the body part along the first direction, at least part of the protruding part protrudes out of the first mounting plate along the second direction, and the second direction is perpendicular to the first direction.

The size of the first mounting plate along the second direction is smaller than that of the first battery cell, and the part, close to the connecting part of the end cover and the shell, of the first wall is not abutted to the first mounting plate after mounting. In the free charge-discharge process of first battery, because the expansion and contraction constantly takes place for first battery, the part of first wall and first mounting panel butt is difficult to take place to warp, and the part of first wall not with first mounting panel butt then takes place to warp easily relatively, and the free shrink and expansion of first battery leads to the junction of end cover and casing to receive the power of dragging repeatedly easily to lead to this junction fracture inefficacy easily. By adopting the scheme, the protruding part is arranged on the first wall, and at least part of the protruding part exceeds the first mounting plate along the second direction, so that the strength of the part, close to the end cover, of the first wall can be improved by the protruding part, the deformation of the first wall is reduced, and the risk of cracking of the joint of the shell and the end cover due to the deformation of the first wall is reduced.

In some embodiments, the protrusion is disposed on a surface of the first wall proximate to the first mounting plate.

Through adopting above-mentioned scheme, can set up the protruding portion in first battery monomer's outside to reduce the occupation of the inner space of first battery monomer.

In some embodiments, the protrusion extends completely beyond the first mounting plate in the second direction, the first mounting plate including a first end face perpendicular to the second direction, the protrusion including a second end face perpendicular to the second direction, the second end face abutting the first end face in the second direction.

Through adopting above-mentioned scheme, can be so that set up in the outside protruding portion of first battery and the coincidence of first mounting panel along the projection of second direction for the protruding portion does not additionally take up the battery along the space of first direction, improves the space utilization to the battery.

In some embodiments, a surface of the first mounting plate facing the first battery cell defines a receiving groove for receiving at least a portion of the protrusion.

When the size of the protruding part along the second direction is larger, or the protruding part does not completely exceed the mounting plate along the second direction, by adopting the scheme, the accommodating groove can be used for accommodating the protruding part of the part so as to reduce the occupation of the space of the battery along the first direction.

In some embodiments, the protrusion is disposed on a surface of the first wall remote from the first mounting plate.

By adopting the scheme, the protruding part can be arranged inside the first battery monomer, so that the protruding part can be prevented from abutting against the first mounting plate, and more assembly space is occupied; meanwhile, the situation that the stress of the first battery monomer is uneven and the overall mechanical property of the battery is influenced due to the gap between the body part and the first mounting plate can be avoided.

In some embodiments, the first wall includes a transition surface connected to the protrusion and the body portion, the transition surface being a curved surface.

Through adopting above-mentioned scheme, avoid the protruding portion to be provided with sharp-pointed edges and easily stab the inside other parts of electrode subassembly or first battery monomer, cause first battery monomer state unusual.

In some embodiments, a maximum dimension of the protrusion portion protruding from the body portion in the first direction is less than or equal to 0.5 mm.

By adopting the scheme, the problem that the size of the part, protruding out of the body part, of the protruding part arranged in the first single battery is overlarge along the first direction is avoided, so that the utilization rate of the internal space of the first single battery is reduced; meanwhile, the influence of the arrangement of the protruding parts on the margin of the electrode assembly in the shell group is reduced, so that the assembly of the electrode assembly is facilitated.

In some embodiments, the maximum dimension of the protrusion in the first direction is less than or equal to 1.2 mm.

By adopting the scheme, the maximum thickness of the protruding part is smaller than or equal to 1.2mm, so that on one hand, the size of the first battery cell can be set to meet the design requirement of light weight; on the other hand, the size of the protruding part along the first direction is prevented from being too large, and the difficulty in processing and manufacturing the shell is reduced.

In some embodiments, the maximum dimension of the protrusion in the second direction is less than or equal to 8 mm.

When the size of the protruding portion in the second direction is large, stretching of the base material during molding into the housing is not facilitated, and it is difficult to achieve the wall thickness requirement of the housing. Through adopting above-mentioned scheme, avoid the protruding part to follow the size of second direction too big to the degree of difficulty when reducing the casing shaping, simultaneously, also can save material, reduce cost.

In some embodiments, the maximum dimension of the protrusion in the second direction is 5% -10% of the maximum dimension of the first wall in the second direction.

Through adopting above-mentioned scheme, can make the size setting of first battery monomer more accord with the light-weighted design requirement, when reducing the probability that the junction of casing and end cover takes place the fracture, save casing material, reduce cost.

In some embodiments, the end cap is welded to the shell to form a weld, and the maximum distance between the protrusion and the weld in the second direction is less than or equal to 0.3 mm.

When the distance between the protruding part and the welding seam is too large, the wall body between the protruding part and the welding seam is easily stressed repeatedly due to repeated contraction and expansion of the first battery cell because the strength is not improved, and the welding seam is easily damaged and cracked. Through adopting above-mentioned scheme, avoid the position of protruding portion to be too far away from the welding seam to promote the protruding portion and strengthen the effect to the intensity of the wall body part that is close to the welding seam.

In a second aspect, the present application provides an electrical device comprising a battery according to any of the embodiments of the first aspect, wherein the battery can be used to provide electrical energy to the electrical device.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

fig. 2 is an exploded schematic view of a battery pack provided in some embodiments of the present application;

fig. 3 is an exploded schematic view of a battery module;

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

FIG. 5 is a perspective isometric view of FIG. 3;

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

FIG. 7 is an enlarged view at G of FIG. 6;

FIG. 8 is an enlarged view of a portion of this application in accordance with still another embodiment G;

FIG. 9 is an enlarged view of a portion of some other embodiment G of the present application;

fig. 10 is a partial enlarged view of fig. 9 at K.

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

Reference numerals

1-a vehicle;

10-battery, 20-controller, 30-motor;

10 '-battery pack, 10' -battery module, 11-box body, 11 a-first box body part, 11 b-second box body part, 11 c-containing space, 11 d-first mounting plate, 11d 1-containing groove and 11 e-side plate;

100-cell, 100 a-first cell, 110-end cap, 120-case, 121-first wall, 121 a-body portion, 121 b-protrusion, 130-electrode assembly;

P₁a first end face, P₂A second end face, P₃-a transition surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 in the description of the application in the present application 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. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. 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.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the preceding and following associated objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

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

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc.

The battery cell comprises a shell, an end cover, an electrode assembly and electrolyte, wherein the end cover and the shell are sealed to form a containing space, and the electrode assembly and the electrolyte are placed in the containing space. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive current collector comprises a positive current collecting part and a positive convex part protruding out of the positive current collecting part, the positive current collecting part is coated with a positive active material layer, at least part of the positive convex part is not coated with the positive active material layer, and the positive convex part is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative convex part protruding out of the negative current collecting part, the negative current collecting part is coated with a negative active material layer, at least part of the negative convex part is not coated with the negative active material layer, and the negative convex part is used as a negative electrode tab. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the spacer may be PP (polypropylene) or PE (polyethylene).

In a conventional battery, a plurality of battery cells are generally arranged and are packaged by end plates, side plates, an upper cover, a bottom plate, and the like, wherein the end plates are generally made of a conductive material such as aluminum material or steel material, and in order to increase a conductive distance between the end plates and electrode terminals, the end plates are generally set to be lower than a height of a case of the battery cells, such that a lower portion of the case is abutted against the end plates, and an upper portion of the case is not abutted against the end plates. Because battery monomer can contract the inflation repeatedly at the charge cycle in-process, make easily not follow battery monomer's contraction expansion with the casing part of end plate butt and take place deformation repeatedly, lead to the junction intensity reduction of casing and end cover and more easy fracture easily, further lead to the holistic reliability of battery module to reduce, life also reduces.

Based on this, the applicant has designed a battery, which includes a plurality of battery cells arranged in a first direction and a first mounting plate (i.e., the aforementioned end plate), where the plurality of battery cells includes a first battery cell adjacent to the first mounting plate, a housing of the first battery cell is provided with a protruding portion, the protruding portion is disposed near a joint of the end cover and the housing, and at least a portion of the protruding portion exceeds the first mounting plate, so that the protruding portion can be used to enhance the strength of a portion of the housing near the joint with the end cover, reduce the deformation degree of the portion of the housing to reduce the risk of repeated stress on the joint of the end cover and the housing, thereby reducing the probability of cracking of the joint, and improve the reliability and the service life of the first battery cell to improve the reliability and the service life of the entire battery.

The embodiment of the application describes a battery and a power consumption device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.

For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. As shown in fig. 1, a battery 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1. The vehicle 1 may further include a controller 20 and a motor 30, the controller 20 being configured to control the battery 10 to power the motor 30, for example, for start-up, navigation, and operational power requirements while the vehicle 1 is traveling. In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Referring to fig. 2 and 3, fig. 2 is an exploded view of a battery pack 10' according to some embodiments of the present disclosure, and fig. 3 is an exploded view of a battery module 10 ″.

As shown in fig. 2, the battery pack 10' may include a case 11 and a battery module 10 ″ received in the case 11.

The case 11 may be used to house the battery module 10 ", and the case 11 may have various structures. In some embodiments, the case 11 may include a first case portion 11a and a second case portion 11b, the first case portion 11a and the second case portion 11b cover each other, and the first case portion 11a and the second case portion 11b together define a receiving space 11c for receiving the battery cell 100. The second casing part 11b may be a hollow structure with one open end, the first casing part 11a is a plate-shaped structure, and the first casing part 11a covers the open side of the second casing part 11b to form the casing 11 with the accommodating space 11 c; the first casing portion 11a and the second casing portion 11b may be hollow structures each having one side opened, and the opening side of the first casing portion 11a may be covered with the opening side of the second casing portion 11b to form the casing 11 having the accommodation space 11 c. Of course, the first casing portion 11a and the second casing portion 11b may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first tank 11a and the second tank 11b are connected, a sealing member, such as a sealant or a gasket, may be provided between the first tank 11a and the second tank 11 b.

Assuming that the first casing part 11a covers the top of the second casing part 11b, the first casing part 11a may also be referred to as an upper casing and the second casing part 11b may also be referred to as a lower casing.

As shown in fig. 3, the battery module 10 "may include an end plate (referred to as a first mounting plate 11d in the following embodiments) and a side plate 11e, the end plate 11d and the side plate 11e may be enclosed to form a frame, a plurality of battery cells 100 are arranged in the frame to form the battery module 10", and the battery module 10 "may further include other functional components such as a bottom plate and a cover plate.

In the battery pack 10' or the battery module 10 ″, there are a plurality of battery cells 100. The plurality of battery cells 100 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 100. In the battery pack 10', as shown in fig. 2 and 3, a plurality of battery cells 100 may be connected in series, in parallel, or in series-parallel to form a battery module 10 ", and a plurality of battery modules 10" may be connected in series, in parallel, or in series-parallel to form a whole, and are accommodated in the case 11. The plurality of battery cells 100 in the battery module 10 "may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 100 in the battery module 10".

Referring to fig. 4, fig. 4 is an exploded view of a battery cell 100 according to some embodiments of the present disclosure.

As shown in fig. 4, the battery cell 100 includes an end cap 110, a case 120, and an electrode assembly 130, the case 120 has an inner cavity and an opening, the opening connects the inner cavity to the external environment, the electrode assembly 130 is placed in the inner cavity of the case 120 through the opening, and the end cap 110 covers the opening to close the inner cavity of the case 120 to form a closed space, which isolates the electrode assembly 130 from the external space.

Referring to fig. 5, 6 and 7, fig. 5 is a perspective view of fig. 3, fig. 6 is a sectional view taken along a-a in fig. 5, and fig. 7 is an enlarged view taken at G in fig. 6.

As shown in fig. 5, 6 and 7, the present application provides a battery 10, the battery 10 including a plurality of battery cells 100 arranged in a row in a first direction X and a first mounting plate 11 d. The plurality of battery cells 100 include a first battery cell 100a disposed at an end; the first mounting plate 11d is disposed at one end of the plurality of battery cells 100 along the first direction X, and the first mounting plate 11d is adjacent to the first wall 121 of the first battery cell 100a, the first battery cell 100a includes an end cap 110 and a housing 120, the housing 120 has an opening, the end cap 110 covers the opening along the second direction Y and is connected to the housing 120, the first wall 121 includes a main body 121a and a protrusion 121b, the protrusion 121b is located on a side of the main body 121a close to the end cap 110 and protrudes from the main body 121a along the first direction X, at least a part of the protrusion 121b protrudes beyond the first mounting plate 11d along the second direction Y, and the second direction Y is perpendicular to the first direction X.

The first mounting plate 11d is mounted at an end of the arranged plurality of battery cells 100 in the first direction X for defining positions of the plurality of battery cells 100. The first direction X is an arrangement direction of the plurality of battery cells 100, and as shown in fig. 6, the battery cell 100 closer to the first mounting plate 11d along the first direction X is a first battery cell 100 a.

The first battery cell 100a may have two sidewalls perpendicular to the first direction X, wherein a sidewall closer to the first mounting plate 11d is the first wall 121, the first wall 121 is adjacent to the first mounting plate 11d, and a dimension of the first mounting plate 11d along the second direction Y is smaller than a dimension of the first wall 121 along the second direction Y. Here, the first wall 121 and the first mounting plate 11d being adjacent to each other may mean that the first wall 121 and the first mounting plate 11d face each other in the first direction X, and the first wall 121 may partially abut against the first mounting plate 11d, or may be considered to have a gap therebetween and not abut against the same. When the first battery cell 100a swells in the first direction X, both cases easily cause the first battery cell 100a and the first wall 121 to be able to abut on a portion in the second direction Y, and some portions of the first battery cell 100a fail to abut on the first wall 121.

The first wall 121 includes a body portion 121a and a protrusion portion 121b, where the protrusion portion 121b is located on a side of the body portion 121a close to the end cap 110 and protrudes from the body portion 121a along the first direction X, in some embodiments of the present application, the protrusion portion 121b may protrude toward the inside of the first battery cell 100a along the first direction X, and in other embodiments of the present application, the protrusion portion 121b may also protrude away from the inside of the first battery cell 100a along the first direction X.

At least a portion of the protrusion 121b extends beyond the first mounting plate 11d along the second direction Y, and it is considered that, when the protrusion 121b and the first mounting plate 11d are projected along the first direction X, at least a portion of the projection of the protrusion 121b does not coincide with the projection of the first mounting plate 11d, or the projection of the protrusion 121b does not coincide with the projection of the first mounting plate 11d at all.

Since the partial wall body of the first wall 121 near the joint between the end cap 110 and the housing 120 is not abutted against the first mounting plate 11d, when the first battery cell 100a expands and contracts for a plurality of times due to charge and discharge cycles, the joint is likely to be subjected to pulling, which leads to a decrease in connection strength, and thus the joint is likely to fail. The protrusion 121b is disposed on the first wall 121, and the protrusion 121b can be used to reduce the deformation of the wall body that is not abutted to the first mounting plate 11d, so as to reduce the pulling force that may be applied to the connection due to the deformation, so as to improve the safety and reliability of the first battery cell 100a, and improve the safety and reliability of the whole battery 10.

With continued reference to fig. 7, in some embodiments of the present application, the protrusion 121b may be disposed on a surface of the first wall 121 adjacent to the first mounting plate 11 d.

The protrusion 121b may be disposed on a surface of the first wall 121 close to the first mounting plate 11d, that is, the protrusion 121b may be disposed to protrude in the first direction X in a direction away from the first battery cell 100a, so that the strength of a partial wall body of the first wall 121 close to the end cap 110 and the housing 120 may be enhanced without occupying the inner space of the first battery cell 100 a.

With continued reference to fig. 7, in some embodiments of the present application, the protrusion 121b extends completely beyond the first mounting plate 11d along the second direction Y, and the first mounting plate 11d includes a first end face P perpendicular to the second direction Y₁The protrusion 121b includes a second end surface P perpendicular to the second direction Y₂Second end face P₂Along the second direction Y and the first end surface P₂And (4) abutting.

In the second direction Y, the protrusion 121b completely protrudes beyond the first mounting plate 11d, that is, the protrusion 121b and the first mounting plate 11d are projected in the first direction X, and the projection of the protrusion 121b does not coincide with the first mounting plate 11d, or only the edge line coincides, so that the protrusion 121b completely protrudes beyond the first mounting plate 11d in the second direction Y.

The first mounting plate 11d includes two end surfaces perpendicular to the second direction Y, and one end surface closer to the protrusion 121b is a first end surface P₁(ii) a The projection 121b also includes two end faces perpendicular to the second direction Y, of which the end face is closer to the first end face P₁Is a second end surface P₂First end face P₂Along the second direction Y and the first end surface P₁And (4) abutting.

In some embodiments of the present application, the protrusion 121b may be completely beyond the first mounting plate 11d in the second direction Y, and the first mounting plate 11d includes a first end face P perpendicular to the second direction Y₁The protrusion 121b includes a second end surface P perpendicular to the second direction Y₂The second end face P can be made₂And the first end face P₁Abutting along the second direction Y. In this way, the protruding portion 121b and the first mounting plate 11d can be at least partially overlapped when projected along the second direction Y, so as to reduce the influence of the arrangement of the protruding portion 121b on the overall size of the battery 10 and improve the utilization rate of space.

Referring to FIG. 8, FIG. 8 is an enlarged view of a portion of another embodiment G of the present application.

As shown in fig. 8, according to some embodiments of the present disclosure, a receiving groove 11d1 is opened on a surface of the first mounting plate 11d facing the first battery cell 100a, and the receiving groove 11d1 can be used for receiving at least a part of the protrusion 121 b.

The receiving groove 11d1 may be formed by recessing the surface of the first mounting plate 11d, and as shown in fig. 8, the cross section of the first mounting plate 11d provided with the receiving groove 11d1 taken along the first direction X may be L-shaped as shown in the figure. The receiving groove 11d1 can be used to receive at least part of the protrusion 121b, and it is considered that, a projection of the receiving groove 11d1 along the first direction X and a projection of the protrusion 121b along the first direction X may partially overlap, and the protrusion 121b may not fill the receiving groove 11d 1; alternatively, as shown in fig. 8, the protrusion 121b may completely fill the accommodating groove 11d1, and the projection of the accommodating groove 11d1 may be completely located in the projection of the protrusion 121b in the first direction X.

When the protrusion 121b does not completely extend beyond the first mounting plate 11d in the second direction Y, a receiving groove 11d1 may be formed on the surface of the first mounting plate 11d facing the first battery cell 100a, so that a portion of the first battery cell 100a not extending beyond the first mounting plate 11d in the second direction Y may be received by the receiving groove 11d1, so that the size of the first battery cell 100a in the first direction X after being mounted in cooperation with the first mounting plate 11d is small to reduce the influence of the arrangement of the protrusion 121b on the overall size.

Referring to fig. 9, fig. 9 is a partial enlarged view of the region G according to some other embodiments of the present application.

As shown in fig. 9, according to some embodiments of the present application, a protrusion 121b may be provided on a surface of the first wall 121 remote from the first mounting plate 11 d.

The protrusion 121b is disposed on the surface of the first wall 121 far from the first mounting plate 11d, that is, the protrusion 121b may be disposed toward the inside of the first battery cell 100a, so that the protrusion 121b may be disposed by using the inner space of the first battery cell 100a, and the outer size of the housing of the first battery cell 100a may be kept unchanged, so as to reduce the influence on the overall size, thereby avoiding the increase in the assembly difficulty due to the difference in the outer sizes of the plurality of battery cells 100.

Referring to fig. 10, fig. 10 is a partial enlarged view of the portion K in fig. 9.

As shown in fig. 10, in some embodiments of the present application,the first wall 121 may include a transition plane P connecting the protrusion 121b and the body portion 121a₃The transition plane P₃Is a cambered surface.

A protrusion 121b may be provided inside the first battery cell 100a, and a transition surface P may be provided between the protrusion 121b and the body 121a₃By passing the transition plane P₃The first wall 121 is provided as a curved surface, so that it is possible to prevent the first wall from having a sharp corner and easily damaging the electrode assembly 130 placed in the case 120, thereby improving reliability and safety of the first battery cell 100 a.

Referring to fig. 10, in some embodiments of the present application, the protrusion 121b protrudes from the maximum dimension D of the body 121a along the first direction X₁Less than or equal to 0.5 mm.

The protrusion 121b protrudes from the maximum dimension D of the body 121a along the first direction X₁Refers to the maximum distance that the protrusion portion 121b protrudes from the inner surface of the body portion 121a in the first direction X with respect to the inner surface. In the specific measurement, the size of the protrusion 121b and the size of the main body 121a may be subtracted from each other to obtain the value, when the size of the protrusion 121b or the main body 121a is measured, the value may be obtained by averaging in a multi-point measurement or measuring in another manner that can better reflect the average value, and the maximum value after the multiple additions and subtractions is the maximum size D of the present embodiment₁。

Such that the protrusion 121b protrudes from the body 121a by the maximum dimension D₁Less than 0.5mm, so as to avoid occupying too much internal space of the first battery cell 100a, and avoid increasing the difficulty of inserting the electrode assembly 130 into the case when the first battery cell 100a is assembled. In addition, since the electrode assembly 130 is shrunk and expanded during the charge and discharge cycles, the partial region of the protrusion 121b is easily brought into contact with the electrode assembly 130 due to the oversize of the protrusion 121b, and the stress concentration of the electrode assembly 130 is easily caused in a local region, and thus, the maximum dimension D of the protrusion 121b protruding from the body portion 121a is increased₁Less than 0.5mm, the probability of stress concentration due to the contact with the protrusions 121b after the expansion of the electrode assembly 130 can be reduced, and the reliability and safety of the first battery cell 100a can be improved.

With continued reference to fig. 10, according to some embodiments of the present application, the maximum dimension D of the protrusion 121b along the first direction X₂Less than or equal to 1.2 mm.

Maximum dimension D of protrusion 121b in first direction X₂Refers to the maximum distance between the inner and outer surfaces of the protrusion 121b in the first direction X.

The maximum dimension D in the first direction X of the measuring protrusion 121b₂The measurement can be carried out by taking the average value by multipoint measurement or other means capable of better reflecting the average value, and the maximum value obtained by comparison after the measurement values are obtained for multiple times is the maximum size D₂。

The maximum dimension D of the protrusion 121b along the first direction X₂Less than or equal to 1.2mm, so that the energy density of the first battery unit 100a can be prevented from being too low due to the oversize of the first wall 121, and the weight of the housing 120 can be reduced due to the arrangement of the protrusion 121b, so that the first battery unit 100a meets the requirement of light weight.

According to some embodiments of the present application, a maximum dimension of the protrusion 121b in the second direction Y is less than or equal to 8 mm.

The maximum dimension of the protrusion 121b in the second direction Y refers to the maximum distance between the upper edge and the lower edge of the protrusion 121b in the second direction Y.

When measuring the maximum size of the protrusion 121b along the second direction Y, the measurement value may be obtained by taking an average value through multi-point measurement or by measuring in another manner that can better reflect the average value, and the maximum size obtained through comparison after obtaining the measurement values multiple times is the maximum size.

By making the maximum dimension of the protrusion 121b in the second direction Y less than or equal to 8mm, the first wall 121 can be more easily stretched, the difficulty in molding the case 120 can be reduced, the material and weight of the case 120 can be reduced, material can be saved to reduce cost, and weight reduction of the first battery cell 100a can be facilitated.

According to some embodiments of the present application, the maximum dimension of the protrusion 121b in the second direction Y is 5% -10% of the maximum dimension of the first wall 121 in the second direction Y.

Since stress concentration is likely to occur on the electrode assembly 130 when the portion of the protrusion 121b is partially abutted against the electrode assembly 130, problems of lithium deposition, pole piece breakage, and the like are likely to occur in the electrode assembly 130. The maximum dimension of the protrusion 121b in the second direction Y is 5% -10% of the maximum dimension of the first wall 121 in the second direction Y, so that the probability of the electrode assembly 130 abutting against a part of the protrusion 121b can be reduced to reduce the risk of problems of lithium precipitation, pole piece breakage, etc. of the electrode assembly 130.

According to some embodiments of the present application, the end cap 110 is welded with the housing 120 to form a weld, and the maximum distance between the protrusion 121b and the weld in the second direction Y is less than or equal to 0.3 mm. That is, the maximum distance between the edge of the protrusion 121b close to the weld bead along the second direction Y and the weld bead is less than or equal to 0.3mm, so that the risk of crack failure at the joint can be reduced, and the reliability and safety of the first battery cell 100a can be improved.

In some embodiments of the present application, there is also provided an electrical device comprising a battery of any of the embodiments of the present application for providing electrical energy to the device.

Referring to fig. 5 and 6, in some embodiments provided herein, a battery 10 is provided, where the battery 10 includes a first mounting plate 11d, a side plate 11e, and a plurality of battery cells 100 arranged along a first direction X, and a size of the first mounting plate 11d along a second direction Y is smaller than a size of the first battery cell 100a along the second direction Y. The plurality of battery cells 100 include a first battery cell 100a adjacent to the first mounting plate 11d, the first battery cell 100a includes a first wall 121 facing the first mounting plate 11d, and the first wall 121 is provided with a body portion 121a and a protrusion portion 121b protruding from the body portion 121 a. In the second direction Y, the protrusion 121b completely protrudes beyond the first mounting plate 11 d. The first mounting plate 11d includes a first end face P1 perpendicular to the second direction Y, and the protrusion 121b includes a second end face P2 perpendicular to the second direction Y, and the second end face P2 abuts the first end face P1 along the second direction Y. In this way, the partial wall body of the first wall 121 close to the joint can improve the strength, and at the same time, the projection of the protrusion 121b along the second direction Y can be partially overlapped with the projection of the first mounting plate 11d along the second direction Y, so that the influence of the arrangement of the protrusion 121b on the size of the whole battery 10 is reduced, and the whole battery 10 is more compact.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (12)

1. A battery, comprising:

the battery pack comprises a plurality of battery units arranged in a first direction, wherein the battery units comprise first battery units arranged at the end parts;

a first mounting plate provided at one end of the plurality of battery cells in the first direction, and abutting a first wall of the first battery cell,

the first battery cell comprises an end cover and a shell, the shell is provided with an opening, the end cover covers the opening along a second direction and is connected with the shell, the first wall comprises a body part and a protruding part, the protruding part is located on one side, close to the end cover, of the body part and protrudes out of the body part along the first direction, at least part of the protruding part protrudes out of the first mounting plate along the second direction, and the second direction is perpendicular to the first direction.

2. The battery of claim 1, wherein the protrusion is disposed on a surface of the first wall proximate to the first mounting plate.

3. The cell defined in claim 2, wherein the protrusion extends completely beyond the first mounting plate in the second direction, the first mounting plate including a first end face perpendicular to the second direction, the protrusion including a second end face perpendicular to the second direction, the second end face abutting the first end face in the second direction.

4. The battery of claim 2, wherein a surface of the first mounting plate facing the first battery cell defines a receiving groove for receiving at least a portion of the protrusion.

5. The battery of claim 1, wherein the protrusion is disposed on a surface of the first wall distal from the first mounting plate.

6. The battery of claim 5, wherein the first wall includes a transition surface connected to the protrusion and the body portion, the transition surface being an arcuate surface.

7. The battery of claim 5, wherein a maximum dimension of the protrusion protruding from the body portion in the first direction is less than or equal to 0.5 mm.

8. The battery of claim 7, wherein a maximum dimension of the protrusion in the first direction is less than or equal to 1.2 mm.

9. The battery of any of claims 1-8, wherein a maximum dimension of the protrusion in the second direction is less than or equal to 8 mm.

10. The battery of any of claims 1-8, wherein a maximum dimension of the protrusion in the second direction is 5% -10% of a maximum dimension of the first wall in the second direction.

11. The battery of any of claims 1-8, wherein the end cap is welded to the housing to form a weld, and the maximum distance of the protrusion from the weld in the second direction is less than or equal to 0.3 mm.

12. An electric consumer, characterized in that the electric consumer comprises a battery according to any of claims 1-11 for providing electric energy.

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