CN216389576U - Battery and electric device - Google Patents

Abstract

The application discloses battery, battery are including a plurality of battery monomers, and a plurality of battery monomers are arranged along thickness direction, and a plurality of battery monomers are including the first battery monomer that is located the tip and the second battery monomer that is located the centre, and first battery monomer is including the first wall that perpendicular thickness direction set up, and second battery monomer is including the second wall that perpendicular thickness direction set up, and the wall thickness of first wall is greater than the wall thickness of second wall. Under the condition that the space inside the battery occupied by the single battery is certain, more space can be reserved inside the second single battery for absorbing the expansion of the electrode assembly, so that the outward expansion degree of the second single battery is reduced, the stress condition of the electrode assembly is improved, and the service life of the single battery is prolonged. The application also discloses a power utilization device comprising the battery.

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. Whether the battery can continuously maintain good cycle performance during long-term use is closely related to the service life of the battery, and when the cycle performance of the battery is poor, the service life of the battery is easily deteriorated to be shortened. Therefore, how to improve the cycle performance of the battery in the long-term use process becomes a problem to be solved urgently in the battery field.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and an electric device, which can improve the phenomenon that the cycle performance of the battery is deteriorated in the using process, and further prolong the service life of the battery and related products.

In a first aspect, the present application provides a battery comprising:

the battery pack comprises a plurality of battery monomers, wherein the battery monomers are arranged along the thickness direction, the battery monomers comprise first battery monomers and second battery monomers, the first battery monomers are located at the end portions, the second battery monomers are located in the middle, the first battery monomers comprise first walls, the first walls are perpendicular to the thickness direction, the second battery monomers comprise second walls, the second walls are perpendicular to the thickness direction, and the wall thickness of the first walls is larger than that of the second walls.

Be provided with electrode assembly in monomer's inside of battery, at the in-process of using, the size inflation of thickness direction can take place for electrode assembly, and this electrode assembly can receive from other battery monomer to resist its expanded effort at the whole in-process that outwards expands of battery monomer, and the effort is too big can lead to this battery monomer's cycle performance to worsen, finally leads to its life to shorten and then influence the holistic life-span of battery. The second battery cell located in the middle is subjected to a large reaction force when the electrode assembly expands outward of the case, so that the cycle performance of the second battery cell is easily deteriorated at a high rate, and the service life of the whole battery is affected. By adopting the scheme, under the condition that the volume of the battery monomer is certain, the wall thickness of the second wall can be reduced to reduce the occupied inner space of the second battery monomer, and the inner space of the second battery monomer is reserved more for absorbing the expansion of the electrode assembly along the thickness direction; or, the second wall can deform to expand the inner space of the second battery cell, so that the stress condition of the electrode assembly in the second battery cell during expansion can be improved to improve the cycle performance of the second battery cell, and the service life of the whole battery can be prolonged.

In some embodiments, the first wall has a wall thickness in the range of 0.8-1.0 mm.

By adopting the above scheme, part of the deformation generated by the first battery cell arranged at the end part when the first battery cell expands can be accommodated by the clearance between the first battery cell and other parts such as the end plate, therefore, the thickness of the first wall can be set within the range of 0.8-1.0mm, and on the basis that the space reserved for accommodating the expansion of the electrode assembly in the first battery cell is sufficient, the wall thickness of the first wall is set to be thicker, so that the strength of the whole battery can be improved.

In some embodiments, the second wall has a wall thickness in the range of 0.3-0.5 mm.

Through adopting above-mentioned scheme, because set up in the middle second battery monomer when the inflation, the battery monomer of its both sides is taking place the inflation equally for can produce the interact power with the battery monomer of both sides when this second battery monomer produces deformation based on the inflation, make the resistance that second battery monomer takes place deformation increase. Therefore, setting the wall thickness of the second wall in the range of 0.3-0.5mm allows the wall thickness of the first wall to occupy a smaller internal space at a constant volume of the second battery cell, enabling more space to be reserved for accommodating expansion of the electrode assembly. When the inner space of the second battery cell is determined, the wall thickness of the second wall is thinner, and deformation is easier to generate, so that the inner space of the second battery cell is easier to further expand.

In some embodiments, the first battery cell includes a housing and an end cap, the housing has an opening, the end cap covers the opening to form the first battery cell, the housing includes a first sidewall parallel to a thickness direction, and a wall thickness of the first sidewall is less than or equal to a wall thickness of the first wall.

When the electrode assembly is a wound electrode assembly, the electrode assembly is expanded not only in the thickness direction but also in the direction perpendicular to the thickness direction as the battery is used for an increased period of time. In the plurality of arranged battery cells, the battery cells are arranged in the thickness direction, and adjacent battery cells are in contact with each other through the side wall perpendicular to the thickness direction and force transmission occurs, and therefore, the wall thickness of the first side wall can be set thinner than that of the first side wall, so that the stress of the electrode assembly when the electrode assembly expands in the direction perpendicular to the thickness direction can be reduced, and the cycle performance of the electrode assembly can be improved.

In some embodiments, the battery includes a first portion and a second portion, the first portion being disposed on both sides of the second portion in the thickness direction, the first portion being composed of a plurality of first battery cells, and the second portion being composed of a plurality of second battery cells.

Through adopting above-mentioned scheme, make first battery monomer be located the both ends of battery, because first wall thickness on the first battery monomer is thicker, be difficult to take place to warp, place in the tip and can strengthen the holistic shock resistance of battery, reduce the probability that the second battery monomer of placing in the centre takes place to warp because external impact.

In some embodiments, the plurality of battery cells includes two adjacent battery cells, and in a direction in which the first battery cell is directed to the second battery cell, the two adjacent battery cells respectively include a third wall and a fourth wall perpendicular to the thickness direction, the third wall is closer to the first battery cell than the fourth wall, and a wall thickness of the third wall is greater than a wall thickness of the fourth wall.

Through adopting above-mentioned scheme, set up first battery monomer at the tip, the great another of wall thickness is closer to first battery monomer in the adjacent battery monomer, can make the battery monomer that is closer to the intermediate position reserve more inner space and be used for holding electrode subassembly's inflation, reduces the outside expanded demand of its casing to improve the free circulation performance of this battery and in order to improve its life.

In some embodiments, the difference in wall thickness between the third wall and the fourth wall is less than or equal to 0.55 mm.

Through adopting above-mentioned scheme, make the wall thickness difference of the free vertical thickness direction's of adjacent battery lateral wall keep in certain extent, avoid causing free serious deformation of battery because free lateral wall intensity of battery is not enough, simultaneously, avoid the local regional intensity difference of battery too big to improve the holistic intensity of battery.

In some embodiments, a size of the first battery cell in the thickness direction is the same as a size of the second battery cell in the thickness direction.

Through adopting above-mentioned scheme, set up first battery monomer and second battery monomer to the same along the size of thickness direction, like this, be convenient for set up the size of battery whole and other parts, reduce because the influence of battery monomer's size difference to battery global design is with the degree of difficulty that reduces design and processing.

In a second aspect, the present application provides an electrical device comprising the battery of the first aspect, the battery being configured 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 provided in accordance with some embodiments of the present application;

fig. 3 is an exploded schematic view of a battery cell provided in some embodiments of the present application;

fig. 4 is a schematic diagram of an arrangement of a plurality of battery cells according to some embodiments of the present disclosure;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 according to some embodiments of the present application;

fig. 6 is an isometric view of a first battery cell provided by some embodiments of the present application;

fig. 7 is a schematic diagram of an arrangement of a plurality of battery cells according to another embodiment of the present disclosure;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 7;

fig. 9 is an isometric view of two adjacent cells provided by some embodiments of the present application;

fig. 10 is a cross-sectional view taken along line C-C of fig. 9.

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

Reference numerals

1-a vehicle;

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

10 a-first part, 10 b-second part, 11-box, 111-first box part, 112-second box part, 113-containing space;

12-a battery cell;

121-end cap, 122-case, 123-electrode assembly;

12 a-first cell, 12a 1-first wall, 12a 2-first side wall;

12 b-second cell, 12b 1-second wall;

12c,12 d-two adjacent cells, 12c 1-a third wall, 12d 1-a fourth wall.

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 former and latter related 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. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

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).

During the use of the battery cell, microscopic internal stress is formed due to the change of the lattice spacing of the negative electrode active material in the process of lithium ion intercalation, so that the negative electrode plate expands and the electrode assembly expands, and the battery cell is easy to expand in appearance due to the expansion of the electrode assembly, particularly in the thickness direction of the battery cell. Because other battery monomers in the battery also expand synchronously, the battery monomer can receive the acting force from other battery monomers for resisting the expansion of the battery monomer in the expansion process, and the lithium embedding difficulty on the negative pole piece can be increased when the acting force is overlarge, so that the cycle performance of the battery monomer is deteriorated, and the service life of the battery monomer is shortened.

Further, the applicant has found that the battery cell located at the end portion in the battery can absorb a part of the expansion by virtue of the fitting clearance with other members such as the end plates when the battery expands, or can absorb a part of the expansion by the end plates undergoing a slight deformation, while the battery cell located in the middle has little extra space available for absorbing the expansion itself because it is tightly abutted against other battery cells when the battery is fitted.

Based on this, the applicant has designed a battery, in which the wall thickness of the battery cells disposed at different positions in the thickness direction is designed to be different in size, and specifically, the wall thickness of the battery cell located at the end of the battery is set to be greater than that of the battery cell located in the middle, so that the battery cell located at the end of the battery can absorb a part of the expansion through other components such as the deformation of the end plate and the assembly gap between the end plate, and more internal space is reserved for the battery cell located in the middle to absorb a part of the expansion, and thus, on the basis of not sacrificing the strength of the whole battery, the possibility that the battery cell suffers from a large external force due to the expansion can be reduced, and the life shortening probability caused by the deterioration of the cycle performance of the battery cell can be reduced, so as to improve the life of the whole battery.

The embodiment of the application describes a battery cell, a battery and an electric 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.

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

Fig. 2 is an exploded view of the battery 10 provided in some embodiments of the present application. As shown in fig. 2, the battery 10 includes a case 11 and a battery cell 12, and the battery cell 12 is accommodated in the case 11.

The case 11 is used for accommodating the battery cells 12, and the case 11 may have various structures. In some embodiments, the box body 11 may include a first box body portion 111 and a second box body portion 112, the first box body portion 111 and the second box body portion 112 cover each other, and the first box body portion 111 and the second box body portion 112 together define a receiving space 113 for receiving the battery cells. The second casing part 112 may be a hollow structure with one open end, the first casing part 111 is a plate-shaped structure, and the first casing part 111 covers the open side of the second casing part 112 to form the casing 11 with the accommodating space 113; the first casing portion 111 and the second casing portion 112 may be hollow structures with one side opened, and the opening side of the first casing portion 111 may cover the opening side of the second casing portion 112 to form the casing 11 having the accommodating space 113. Of course, the first and second casing portions 111 and 112 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing property after the first casing portion 111 and the second casing portion 112 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first casing portion 111 and the second casing portion 112.

Assuming that the first box portion 111 covers the top of the second box portion 112, the first box portion 111 may also be referred to as an upper box cover, and the second box portion 112 may also be referred to as a lower box body.

In the battery 10, the number of the battery cells 12 is plural. The plurality of battery cells 12 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 12. The plurality of battery monomers 12 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 12 is accommodated in the box body 11; of course, a plurality of battery cells 12 may be connected in series, in parallel, or in series-parallel to form a battery module (not shown), and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the box 11. The plurality of battery cells 12 in the battery module may be electrically connected to each other through the bus bar, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 12 in the battery module.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 12 according to some embodiments of the present disclosure. As shown in fig. 3, the battery cell 12 includes an end cap 121, a case 122 and an electrode assembly 123, the case 122 has an inner cavity and an opening, the opening connects the inner cavity to the external environment, the electrode assembly 123 is placed in the inner cavity of the case 122 through the opening, the end cap 121 covers the opening to close the inner cavity of the case 122 to form a closed space, and the electrode assembly 123 is isolated from the external space.

Referring to fig. 4 and 5, fig. 4 is a schematic diagram illustrating an arrangement of a plurality of battery cells 12 according to some embodiments of the present disclosure, and fig. 5 is a sectional view taken along a-a direction in fig. 4.

As shown in fig. 4 and 5, in the present application, a battery 10 is provided, where the battery 10 includes a plurality of battery cells 12 arranged in a thickness direction X, the plurality of battery cells 12 includes a first battery cell 12a located at an end and a second battery cell 12b located in the middle, the first battery cell 12a includes a first wall 12a1 disposed perpendicular to the thickness direction X, the second battery cell 12b includes a second wall 12b1 disposed perpendicular to the thickness direction X, and a wall thickness of the first wall 12a1 is greater than a wall thickness of the second wall 12b 1.

The first battery cell 12a is located at an end, and when the battery includes an end plate structure, the first battery cell 12a may be considered as a battery cell adjacent to the end plate, and the second battery cell 12b may be located in the middle, all of the battery cells 12 except the first battery cell 12a located at the end may be set as the second battery cell 12b, or one or two of the battery cells 12 located at the middle of the plurality of rows may be set as the second battery cell 12 b.

The first cell 12a and the second cell 12b differ at least in that the wall thickness of the side walls of the two cells is not uniform, either entirely or only locally, for example. Specifically, the first battery cell 12a includes a first wall 12a1 disposed perpendicular to the thickness direction X, the second battery cell 12b includes a second wall 12b1 disposed perpendicular to the thickness direction X, and the wall thickness of the first wall 12a1 is greater than the wall thickness of the second wall 12b 1. It is considered that the wall thickness herein means the maximum wall thickness of the first wall 12a1 and the second wall 12b 1; alternatively, it can be considered that the wall thickness here refers to the average wall thickness of the first wall 12a1 and the second wall 12b1, and when the wall thickness refers to the average wall thickness of the first wall 12a1 and the second wall 12b1, the wall thickness can be obtained by averaging the multipoint sampling of the first wall 12a1 and the second wall 12b 1.

By adopting the above-described scheme, in the case where the volumes of the battery cells 12 are the same, i.e., the volumes of the first battery cell 12a and the second battery cell 12b are the same, a larger inner space of the second battery cell 12b is reserved for absorbing the expansion of the electrode assembly 123, to reduce the degree to which the electrode assembly 123 in the second cell 12b swells outside the case, thereby reducing the stress of the electrode assembly 123 thereof when swelling, improving the cycle performance of the second battery cell 12b, while the first cell 12a has a larger wall thickness relative to the second cell 12b, and a smaller interior space, but at the end, there is a gap in assembly with other components of the end, such as end plates and the like, the partial gap may be used to absorb the outward expansion of a portion of the first battery cell 12a, and the space caused by the slight deformation of the end plate may also absorb the expansion of a portion of the first battery cell 12 a. In addition, since the first wall 12a1 is thick, the strength of the case 122 is high, and the first battery cell 12a is disposed at the end portion, which is beneficial to reducing the deformation of the plurality of battery cells 12 when being impacted by the external force, thereby reducing the impact influence on the entire battery.

With continued reference to fig. 4 and 5, in some embodiments of the present application, the wall thickness of the first wall 12a1 may be optionally set to 0.8-1.0mm, and the wall thickness of the second wall 12b1 may be optionally set to 0.3-0.5 mm.

By adopting the above-described configuration, the first wall 12a1 has a relatively large wall thickness, a relatively small expansion space is reserved inside, the probability of expansion of the electrode assembly 123 to the outside of the case 122 is relatively high, the strength of the first wall 12a1 is also high, and the impact resistance of the whole can be improved by providing the first wall at the end portion. The wall thickness of the second wall 12b1 is set to be thinner than the first wall 12a1, more internal space can be reserved for accommodating the expansion of the electrode assembly 123, the probability of expansion of the electrode assembly 123 out of the case 122 is reduced, and the wall thickness of the second wall 12b1 is thinner, but still meets the strength requirements of the second battery cell 12b1 itself.

Referring to fig. 6, fig. 6 is an isometric view of a first battery cell 12a according to some embodiments of the present disclosure.

As shown in fig. 6, in some embodiments of the present application, optionally, the first battery cell 12a includes an end cap 121 and a housing 122, the housing 122 is provided with an opening, the end cap 121 covers the opening to form the first battery cell 12a, the housing 122 includes a first side wall 12a2 parallel to the thickness direction X, and a wall thickness of the first side wall 12a2 is smaller than or equal to a wall thickness of the first wall 12a 1.

When the electrode assembly 123 is a wound electrode assembly, the electrode assembly 123 expands not only in the thickness direction X but also in the direction Y perpendicular to the thickness direction X as the battery 10 is used for a longer period of time. In the plurality of arranged battery cells 12, the battery cells 12 are arranged in the X direction, and the adjacent battery cells 12 are abutted by the side wall perpendicular to the X direction, and based on this, the wall thickness of the first side wall 12a2 can be set thinner than that of the first wall 12a1, so that the force applied to the electrode assembly 123 when expanded in the Y direction can be reduced to improve the cycle performance of the electrode assembly 123.

Referring to fig. 7 and 8, fig. 7 is a schematic diagram illustrating an arrangement of a plurality of battery cells 12 according to another embodiment of the present disclosure, and fig. 8 is a cross-sectional view taken along the direction B-B in fig. 7.

As shown in fig. 7 and 8, in some embodiments of the present application, optionally, the battery 10 includes a first portion 10a and a second portion 10b, the first portion 10a is disposed on both sides of the second portion 10b in the thickness direction X, the first portion 10a is composed of a plurality of first battery cells 12a, and the second portion 10b is composed of a plurality of second battery cells 12 b.

The first portion 10a may be composed of one or more first battery cells 12a, and the second portion 10b may also be composed of one or more second battery cells 12b, since the wall thickness of the first wall 12a1 of the first battery cell 10a is thicker than the wall thickness of the second wall 12b1 of the second battery cell 12b, and the strength of the housing 122 is also greater, placing the plurality of first battery cells 12a constituting the first portion 10a at the end can improve the impact resistance of the entire battery 10, and placing the plurality of second battery cells 12b with relatively weak strength at the middle position, so that the probability of deformation of the second battery cells 12b due to impact can be reduced.

Referring to fig. 9 and 10, fig. 9 is an isometric view of two adjacent battery cells 12 according to some embodiments of the present disclosure, and fig. 10 is a cross-sectional view taken along line C-C of fig. 9.

As shown in fig. 9 and 10, in some embodiments of the present application, optionally, the plurality of battery cells 12 includes two adjacent battery cells 12, and in a direction in which the first battery cell 12a points to the second battery cell 12b, the two adjacent battery cells (12c and 12d) respectively include a third wall 12c1 and a fourth wall 12d1 perpendicular to the thickness direction X, the third wall 12c1 is closer to the first battery cell 12a than the fourth wall 12d1, and the wall thickness of the third wall 12c1 is greater than that of the fourth wall 12d 1.

Through the arrangement of the scheme, one of the adjacent battery cells 12 which is closer to the first battery cell 12a has higher strength, namely, the wall thickness of the third wall 12c1 is greater than that of the fourth wall 12d1, and the battery cell 12 which is closer to the middle position can reserve more internal space for accommodating the expansion of the electrode assembly 123, so that the expansion degree of the battery cell 12 which is located in the middle is reduced, the stress condition of the battery cell is improved, and the service life of the battery cell is prolonged. Alternatively, the difference in wall thickness of the third wall 12c1 and the fourth wall 12d1 may be set to be less than or equal to 0.55mm so that the difference in strength of the third wall 12c1 and the fourth wall 12d1 is maintained within a certain range, avoiding excessive local strength differences in the cell 10.

In some embodiments of the present application, the size of the first battery cell 12a in the thickness direction X may be optionally made the same as the size of the second battery cell 12b in the thickness direction X.

By setting the dimensions of the first battery cell 12a and the second battery cell 12b in the thickness direction to be the same, even if the wall thickness D of the first wall 12a1 is set to be the same₁The first battery cell 12a can be prevented from occupying more internal space of the battery 10 by being thicker, so as to improve the utilization rate of the internal space of the battery 10. In addition, the overall dimensions of the plurality of battery cells 12 are unified, so that the overall dimensions of the battery 10 and the dimensions of other components are conveniently set, the influence on the overall design of the battery 10 due to the dimensional difference of the battery cells 12 is reduced, and the difficulty in designing and processing is reduced.

Referring to fig. 4 and 5, the present application provides a battery 10, where the battery 10 includes a plurality of aligned battery cells 12, and the plurality of battery cells 12 includes a first battery cell 12a and a second battery cell 12b, where the first battery cell 12a is located at an end of the aligned battery cells 12, the second battery cell 12b is located in the middle, and the first battery cell 12a includes a first wall 12a1 perpendicular to a thickness direction X, the second battery cell 12b includes a second wall 1 perpendicular to the thickness direction X, and a wall thickness of the first wall 12a1 is greater than a wall thickness of the second wall 12b1, so that the second battery cell 12b can reserve more internal space for accommodating expansion of an electrode assembly 123, thereby reducing a rate of deterioration of cycle performance of the second battery cell 12b, and improving a service life of the entire battery 10. The first battery cell 12a has a stronger strength than the second battery cell 12b, and the impact resistance of the entire battery 10 can be improved by placing the first battery cell 12a at the end, thereby improving the reliability and safety of the entire battery 10.

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 (9)

1. A battery, comprising:

a plurality of battery cells stacked in a thickness direction, the plurality of battery cells including a first battery cell at an end and a second battery cell in a middle, the first battery cell including a first wall disposed perpendicular to the thickness direction, the second battery cell including a second wall disposed perpendicular to the thickness direction,

the first wall has a wall thickness greater than a wall thickness of the second wall.

2. The battery of claim 1, wherein the first wall has a wall thickness in the range of 0.8-0.5 mm.

3. The battery of claim 1, wherein the second wall has a wall thickness in the range of 0.3-0.5 mm.

4. The battery of claim 1, wherein the first battery cell comprises a housing and an end cap, the housing is provided with an opening, the end cap covers the opening to form the first battery cell, the housing comprises a first side wall parallel to the thickness direction, and the wall thickness of the first side wall is less than or equal to that of the first wall.

5. The battery according to any one of claims 1 to 4, wherein the battery includes a first portion and a second portion, the first portion being provided on both sides of the second portion in the thickness direction,

wherein the first portion is composed of a plurality of the first battery cells, and the second portion is composed of a plurality of the second battery cells.

6. The battery of any of claims 1-4, wherein the plurality of battery cells includes two adjacent battery cells that include a third wall and a fourth wall, respectively, perpendicular to the thickness direction, the third wall being closer to the first battery cell than the fourth wall,

the third wall has a wall thickness greater than a wall thickness of the fourth wall.

7. The battery of claim 6, wherein the difference in wall thickness between the third wall and the fourth wall is less than or equal to 0.55 mm.

8. The battery of claim 1, wherein a minimum dimension of the first battery cell in the thickness direction is the same as a minimum dimension of the second battery cell in the thickness direction.

9. An electric consumer, characterized in that the electric consumer comprises a battery according to any of claims 1-8 for providing electric energy.

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