CN217444527U

CN217444527U - Battery and electric device

Info

Publication number: CN217444527U
Application number: CN202221478328.0U
Authority: CN
Inventors: 陈佳华; 刘倩; 李全国; 孙婧轩; 肖得隽; 喻春鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-09-16
Anticipated expiration: 2032-06-14
Also published as: WO2023240797A1

Abstract

The application discloses a battery and a power consumption device. The battery of the embodiment of the present application includes a plurality of first battery cells and a battery unit. The battery unit is stacked with a plurality of first battery cells in a first direction. The battery unit includes a plurality of second battery cells arranged in a second direction, which is perpendicular to the first direction. The first battery cell and the second battery cell have different shapes. In the first direction, each second battery cell at least partially overlaps the first battery cell. In the second direction, a gap is arranged between at least two adjacent second battery cells of the battery unit. The gap can provide a space for the expansion of the first battery monomer, so that the expansion force applied to the first battery monomer is reduced, the cycle performance of the first battery monomer is improved, and the service life of the battery is prolonged.

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

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

In the development of battery technology, how to improve the cycle performance of batteries is an important research direction in battery technology.

SUMMERY OF THE UTILITY MODEL

Provided are a battery and a power consumption device, which can improve the cycle performance of the battery.

In a first aspect, the present application provides a battery including a plurality of first battery cells and a battery unit. The battery unit is stacked with a plurality of first battery cells in a first direction. The battery unit includes a plurality of second battery cells arranged in a second direction perpendicular to the first direction. The first battery cell and the second battery cell have different shapes. In the first direction, each second battery cell at least partially overlaps the first battery cell. In the second direction, a gap is arranged between at least two adjacent second battery cells of the battery unit.

In the technical scheme, because each second battery cell has the part overlapped with the first battery cell in the first direction, each second battery cell can limit the deformation of the first battery cell in the first direction, so that the appearance of the first battery cell is improved, and the overall strength of the battery is improved. In the embodiment, a plurality of first battery monomers and a plurality of second battery monomers are arranged in a mixed manner, so that a gap is formed between at least two second battery monomers, and the gap can provide a space for the expansion of the first battery monomer, thereby reducing the expansion force applied to the first battery monomer, improving the cycle performance of the first battery monomer and prolonging the service life of the battery.

In some embodiments, the first battery cell has two first surfaces disposed opposite to each other in the first direction, and the first surfaces are planar. At least part of the outer surface of the second battery monomer is an arc-shaped surface, and the arc-shaped surface is used for being connected with the first surface. In the second direction, a gap is formed between the arc-shaped surfaces of two adjacent second battery cells.

Among the above-mentioned technical scheme, the arcwall face is connected with first surface, can reduce the heat transfer area between first battery monomer and the second battery monomer, reduces the heat transfer rate between first battery monomer and the second battery monomer, when certain battery monomer thermal runaway appears, reduces the risk of thermal diffusion, improves the security of battery.

In some embodiments, the first battery cell is a prismatic battery cell and the second battery cell is a cylindrical battery cell.

Among the above-mentioned technical scheme, when cylinder battery monomer and square battery monomer mix and arrange, the space between the cylinder battery monomer can provide the space for the free inflation of square battery, and then reduces the free bulging force who receives of square battery, improves the free circulation performance of square battery.

In some embodiments, a space is provided between any two adjacent second battery cells in the battery unit. The plurality of gaps can provide more space for the expansion of the first battery monomer, so that the expansion force applied to the first battery monomer is reduced, the cycle performance of the first battery monomer is improved, and the service life of the battery is prolonged.

In some embodiments, the first battery cell includes a first housing having a dimension L along the second direction ₁ . The number of the second battery cells of the battery unit is n, and the dimension of each second battery cell along the second direction is D ₁ 。L ₁ 、D ₁ And n satisfies: l is ₁ ≥（n-1）·D ₁ 。

In the above technical solution, the size of the overlapping area of the second battery cell and the first battery cell in the first direction at the end of the battery unit in the second direction can be substantially ensured at D ₁ And/2, so that each second battery cell of the battery unit can be effectively supported and limited by the first battery cell.

In some embodiments, the first battery cell includes a first housing having a dimension L along the second direction ₁ . The number of the second battery cells of the battery unit is n, and the dimension of each second battery cell along the second direction is D ₁ ，L ₁ 、D ₁ And n satisfies: n.D ₁ ≥0.5·L ₁ 。

The above technical solution can make the battery cell effectively utilize the space in the second direction.

In some embodiments, L ₁ 、D ₁ And n satisfies: l is ₁ ≤（n+1）D ₁ 。

The technical scheme can ensure that the battery unit effectively utilizes the space in the second direction and reduce the loss of the energy density of the battery.

In some embodiments, the first battery cell includes a first housing having a dimension L along the first direction ₂ . The dimension of each second battery cell along the first direction is D ₂ ，D ₂ ＜2·L ₂ 。

D ₂ Is positively correlated with the dimension of the void in the first direction if D ₂ Too large, may result in wasted space, resulting in insufficient energy density of the battery. The technical proposal leads D ₂ ＜2·L ₂ To reduce the loss of energy density of the battery.

In some embodiments, the battery further comprises a functional component, at least a portion of the functional component being received in the void. The voids can provide space for functional components, thereby making the overall structure of the battery more compact.

In some embodiments, the functional component includes at least one of a heat exchanger, a thermal insulator, a buffer, and an adhesive.

In some embodiments, a battery unit is disposed between at least two adjacent first battery cells. The void of the battery cell may provide a space for the expansion of the first battery cell at both sides thereof, thereby improving the cycle performance of the first battery cell.

In some embodiments, a battery unit is disposed between any two adjacent first battery cells. The battery cell may separate the first battery cells to prevent adjacent first battery cells from directly pressing against each other. The void of the battery cell may provide a space for the expansion of each first battery cell, thereby improving the cycle performance of the first battery cell and extending the life of the battery.

In some embodiments, the battery cell is provided in plurality, and the plurality of battery cells and the plurality of first battery cells are alternately arranged in the first direction. Each battery unit can provide space for the expansion of the first battery unit adjacent to the battery unit, so that the superposition of the expansion amount of the plurality of first battery units in the first direction can be reduced, the cycle performance of the first battery units is improved, and the service life of the battery is prolonged.

In some embodiments, at least one end of the battery in the first direction is provided as a battery cell. When one side of the battery in the first direction is subjected to external impact, the voids of the battery cell may function to disperse stress, thereby reducing the risk of failure of the first battery cell.

In some embodiments, both ends of the battery in the first direction are provided as battery cells. The battery unit can protect the first battery cell from both ends to reduce the risk of failure of the first battery cell.

In some embodiments, the battery cell is provided in plurality, and the plurality of battery cells and the plurality of first battery cells are stacked in the first direction.

In some embodiments, the number of the second battery cells of the plurality of battery cells tends to decrease first and then increase in the first direction.

The plurality of battery units and the plurality of first battery cells are stacked in the first direction, and the expansion amount of the plurality of first battery cells is overlapped toward the middle of the battery, that is, the closer to the middle, the larger the expansion force received by the first battery cells. According to the technical scheme, the number of the second battery monomers of the battery unit in the middle of the battery is reduced, more space is provided for expansion of the first battery monomer, the expansion force of the first battery monomer is reduced, and the performance of the first battery monomer is improved.

In some embodiments, the first battery cell includes a first case and a first electrode terminal disposed at one side of the first case in the second direction.

In some embodiments, the first battery cell includes a first case and a first electrode terminal disposed at the first case, the first electrode terminal being disposed at one side of the first case in a third direction perpendicular to the first and second directions.

In some embodiments, the battery further includes a plurality of bus members for electrically connecting the plurality of first battery cells and the plurality of second battery cells of the battery unit.

In some embodiments, the first battery cell includes first and second electrode terminals having opposite polarities, and the second battery cell includes third and fourth electrode terminals having opposite polarities. The plurality of bus members includes a first bus member for electrically connecting the third electrode terminals of the plurality of second battery cells of the battery unit with the first electrode terminals.

In the above-described technical solution, the first bus member connects the third electrode terminals of the plurality of second battery cells of the battery unit to connect the plurality of second battery cells of the battery unit in parallel. The first bus member is also connected to the first electrode terminal of the first battery cell, so that the first battery cell can be connected in series or in parallel with the battery cell.

In some embodiments, the polarity of the third electrode terminal and the first electrode terminal is opposite. The first bus member connects a plurality of second battery cells of the battery unit in series with the first battery cell.

In some embodiments, the first electrode terminal is located at one end of the first battery cell in a third direction perpendicular to the first and second directions. The third electrode terminal is located at one end of the second battery cell away from the first electrode terminal in the third direction. The first bus member includes a first connection part for connecting the first electrode terminals, a second connection part for connecting the third electrode terminals of the plurality of second battery cells of the battery unit, and a third connection part for connecting the first connection part and the third connection part, and both the first connection part and the third connection part are bent with respect to the second connection part.

Among the above-mentioned technical scheme, the first electrode terminal and the third electrode terminal that are located opposite both sides can be connected to the first part of converging that has the structure of buckling, and then realize the electric connection of first battery monomer and a plurality of second battery monomers of battery unit.

In some embodiments, the first battery cell is a lithium ion battery cell and the second battery cell is a sodium ion battery cell. The first battery monomer adopts a lithium ion battery monomer to ensure the energy density of the battery. The second battery monomer adopts the single sodium ion battery to reduce the single risk of losing efficacy when receiving the single extrusion of first battery of second battery. In the embodiment, the energy density and the safety of the battery can be balanced by assembling the lithium ion battery monomer and the sodium ion battery monomer into a group.

In some embodiments, the first battery cell is a ternary lithium battery cell, and the second battery cell is a sodium ion battery cell or a lithium iron phosphate battery cell. The first battery monomer adopts a ternary lithium battery monomer to ensure the energy density of the battery. The second battery monomer adopts a sodium ion battery monomer or a lithium iron phosphate battery monomer to reduce the risk of failure of the second battery monomer when being extruded by the first battery monomer.

In a second aspect, the present application provides an electric device, which includes the battery provided in any embodiment of the first aspect, and the battery is used for providing electric energy.

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 a schematic structural diagram of a battery provided in some embodiments of the present application;

fig. 4 is an exploded view of the first battery cell shown in fig. 3;

fig. 5 is a schematic cross-sectional view of the second battery cell shown in fig. 3;

FIG. 6 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application;

FIG. 7 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application;

FIG. 8 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application;

FIG. 9 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application;

FIG. 10 is a schematic top view of the battery shown in FIG. 3;

FIG. 11 is a schematic diagram of a battery according to further embodiments of the present application;

FIG. 12 is a schematic diagram of a battery according to further embodiments of the present application;

FIG. 13 is a schematic diagram of a battery according to still another embodiment of the present application;

FIG. 14 is a schematic diagram of a battery according to further embodiments of the present application;

fig. 15 is a schematic view of another structure of the battery of fig. 14, in which a frame structure is omitted;

fig. 16 is a schematic view of the battery shown in fig. 15 at another angle;

FIG. 17 is a schematic diagram of a battery according to further embodiments of the present application;

FIG. 18 is a schematic diagram of a battery according to further embodiments of the present application;

FIG. 19 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application;

fig. 20 is a simplified schematic diagram of a battery provided in accordance with further embodiments of the present application.

The reference numerals for the specific embodiments are as follows:

1. a vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a box body; 5a, a first tank portion; 5b, a second tank portion; 5c, an accommodating space; 6. a battery module;

10. a first battery cell; 10a, a first surface; 10b, a second surface; 10c, a third surface; 11. a first housing; 111. a first housing; 112. a first end cap; 12. a first electrode assembly; 13. a first electrode terminal; 14. a second electrode terminal;

20. a battery cell; 30. a second battery cell; 30a, an outer surface; 31. a second housing; 311. a second housing; 312. a second end cap; 32. a second electrode assembly; 33. a third electrode terminal; 34. a fourth electrode terminal;

40. a functional component; 50. a bus member; 51. a first bus member; 511. a first connection portion; 512. a second connecting portion; 513. a third connecting portion; 52. a second bus member; 53. a third bus member; 60. a frame structure; 61. an end plate; 62. a side plate; 70. a battery row;

G. a void; x, a first direction; y, a second direction; z, third direction.

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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. 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 the case may be.

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).

The term "parallel" in this application includes not only the case of absolute parallelism, but also the case of substantially parallel as conventionally recognized in engineering; meanwhile, "vertical" also includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering.

In this application, the battery cell may include a lithium ion battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in this application.

The embodiments of the present application refer to a battery that refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity. The battery may 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 includes a case and an electrode assembly accommodated in the case, the electrode assembly including 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 electrode lug, wherein the positive current collecting part is coated with a positive active substance layer, and the positive electrode lug is not coated with the positive active substance layer. 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 electrode lug, wherein the negative current collecting part is coated with a negative active material layer, and the negative electrode lug is not coated with the negative active material layer. 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. The material of the spacer may be PP (polypropylene) or PE (polyethylene).

Since the battery cells may expand during charge and discharge cycles, the adjacent battery cells may exert an expansion force against each other due to the expansion. If the expansion force between the two battery cells is too large, the electrolyte inside the electrode assembly of the battery cells may be pressed out, affecting the cycle performance of the battery cells.

In view of this, an embodiment of the present application provides a battery, in which a plurality of first battery cells and a plurality of second battery cells are arranged in a mixed manner, so that a gap is formed between at least two adjacent second battery cells, and the gap can provide a space for expansion of the first battery cell, thereby reducing an expansion force applied to the first battery cell, and improving cycle performance of the first battery cell.

The technical scheme described in the embodiment of the application is suitable for the 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 tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric 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 according to some embodiments of the present disclosure.

As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 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 schematic view of a battery provided in some embodiments of the present application.

As shown in fig. 2, the battery 2 includes a case 5 and a battery cell (not shown in fig. 2) accommodated in the case 5.

The case 5 is used for accommodating the battery cells, and the case 5 may have various structures. In some embodiments, the case 5 may include a first case portion 5a and a second case portion 5b, the first case portion 5a and the second case portion 5b cover each other, and the first case portion 5a and the second case portion 5b together define a receiving space 5c for receiving the battery cell. The second casing part 5b may be a hollow structure with one open end, the first casing part 5a is a plate-shaped structure, and the first casing part 5a covers the open side of the second casing part 5b to form a casing 5 with a containing space 5 c; the first casing portion 5a and the second casing portion 5b may each be a hollow structure having one side opened, and the opened side of the first casing portion 5a may be covered with the opened side of the second casing portion 5b to form the casing 5 having the accommodation space 5 c. Of course, the first casing portion 5a and the second casing portion 5b 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 5a and the second tank 5b are connected, a sealing member, such as a sealant or a gasket, may be provided between the first tank 5a and the second tank 5 b.

Assuming that the first box portion 5a covers the top of the second box portion 5b, the first box portion 5a may also be referred to as an upper box cover, and the second box portion 5b may also be referred to as a lower box cover.

In the battery 2, a plurality of battery cells may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that a plurality of battery cells are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body 5; of course, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series or in parallel or in series-parallel to form a whole and accommodated in the box 5.

Fig. 3 is a schematic structural diagram of a battery provided in some embodiments of the present application; fig. 4 is an exploded view of the first battery cell shown in fig. 3; fig. 5 is a schematic cross-sectional view of the second battery cell shown in fig. 3.

As shown in fig. 3 to 5, the present embodiment provides a battery 2 including a plurality of first battery cells 10 and a battery unit 20. The battery unit 20 is stacked with a plurality of first battery cells 10 in the first direction X. The battery unit 20 includes a plurality of second battery cells 30 arranged in a second direction Y, which is perpendicular to the first direction X. In the first direction X, each of the second battery cells 30 at least partially overlaps the first battery cell 10. In the second direction Y, a gap G is provided between at least two adjacent second battery cells 30 of the battery unit 20.

One or more battery cells 20 may be provided.

In some examples, there is one battery unit 20, and the plurality of first battery cells 10 may be disposed on the same side of the battery unit 20 along the first direction X, or may be disposed on both sides of the battery unit 20 along the first direction X.

In other examples, the battery cell 20 is a plurality of, and the plurality of battery cells 20 and the plurality of first battery cells 10 are stacked in the first direction X. The present example does not limit the stacking order of the battery units 20 and the first battery cells 10, and for example, the plurality of battery units 20 and the plurality of first battery cells 10 may be alternately arranged along the first direction X, the plurality of battery units 20 may be continuously arranged, the plurality of first battery cells 10 may be continuously arranged, or the battery units 20 and the first battery cells 10 may be arranged in other arrangements. The number of the second battery cells 30 of the plurality of battery units 20 may be the same or different.

In the present embodiment, the second direction Y is perpendicular to the first direction X. Of course, the second direction Y is not absolutely perpendicular to the first direction X, and a certain error is allowed. Exemplarily, the first direction X may be considered to be perpendicular to the second direction Y when the angle between the second direction Y and the first direction X is 80 ° -100 °.

The first battery cell 10 and the second battery cell 30 may adopt the same chemical system or different chemical systems. The chemical system is directed to the positive active material of the battery cell. Illustratively, the first battery cell 10 may be a sodium ion battery cell, a lithium ion battery cell, a magnesium ion battery cell, or other metal ion battery cell, and the second battery cell 30 may be a sodium ion battery cell, a lithium ion battery cell, a magnesium ion battery cell, or other metal ion battery cell. The lithium ion battery monomer includes, but is not limited to, a lithium nickel cobalt manganese system battery monomer, a lithium iron phosphate system battery monomer, a lithium cobalt oxide system battery monomer, a lithium iron manganese phosphate system battery monomer, a lithium nickel oxide system battery monomer or a battery monomer of other systems.

In some examples, a projection of the second battery cell 30 in the first direction X partially overlaps a projection of the first battery cell 10 in the first direction X. In other alternative examples, the projection of the second battery cell 30 along the first direction X is located within the projection of the first battery cell 10 along the first direction X.

The dimension of the first battery cell 10 in the second direction Y is larger than the dimension of the second battery cell 30 in the second direction Y, so that each second battery cell 30 has a portion overlapping the first battery cell 10 in the first direction X.

In two adjacent second battery cells 30, the gap G separates at least a portion of one second battery cell 30 from at least a portion of the other second battery cell 30 in the second direction Y. In other words, at least a portion of a surface of one second battery cell 30 facing the other second battery cell 30 in the second direction Y is spaced apart from the other second battery cell 30 to form the gap G.

In some examples, in two adjacent second battery cells 30, the gap G separates only a portion of one second battery cell 30 from the other second battery cell 30 in the second direction Y; that is, two adjacent second battery cells 30 may have a contact. In other examples, the gap G completely separates one second battery cell 30 from another second battery cell 30 in the second direction Y among two adjacent second battery cells 30, that is, the two adjacent second battery cells 30 do not contact.

Other members may or may not be provided in the gap G.

Since each of the second battery cells 30 has a portion overlapping the first battery cell 10 in the first direction X, each of the second battery cells 30 can limit deformation of the first battery cell 10 in the first direction X, so as to improve the appearance of the first battery cell 10 and improve the overall strength of the battery 2. In this embodiment, a plurality of first battery cells 10 and a plurality of second battery cells 30 are arranged in a mixed manner, so that a gap G is formed between at least two second battery cells 30, and the gap G can provide a space for the expansion of the first battery cell 10, thereby reducing the expansion force applied to the first battery cell 10, improving the cycle performance of the first battery cell 10, and prolonging the service life of the battery 2.

In some embodiments, the first battery cell 10 adjacent to the battery cell 20 covers the gap G from one side of the gap G in the first direction X.

In some embodiments, the first battery cell 10 has two first surfaces 10a oppositely disposed along the first direction X, and the first surfaces 10a are planar. At least a portion of the outer surface 30a of the second battery cell 30 is an arc-shaped surface, and the arc-shaped surface is used for being connected with the first surface 10 a. In the second direction Y, a gap G is formed between the arc-shaped surfaces of two adjacent second battery cells 30.

The arc-shaped surface can be an elliptical arc surface, a cylindrical surface, a spherical surface or other arc-shaped curved surfaces.

The arc-shaped surface can directly abut against the first surface 10a, and can be connected to the first surface 10a through other structures. Illustratively, the arc-shaped surface may be adhered to the first surface 10a by glue.

When the arc-shaped surface contacts the first surface 10a, the arc-shaped surface and the first surface are approximately in line contact or point contact, and the arc-shaped surface is connected with the first surface 10a in this embodiment, so that the heat transfer area between the first battery cell 10 and the second battery cell 30 can be reduced, the heat transfer rate between the first battery cell 10 and the second battery cell 30 can be reduced, and when a certain battery cell is out of control due to heat, the risk of heat diffusion is reduced, and the safety of the battery 2 is improved.

In some embodiments, the first battery cell 10 and the second battery cell 30 have different shapes.

The first battery cell 10 and the second battery cell 30 have different shapes, so that the shape and the size of the gap G can be more flexible.

Illustratively, the shape of the first battery cell 10 refers to the shape of the outer case of the first battery cell 10, and the shape of the second battery cell 30 refers to the shape of the outer case of the second battery cell 30.

For example, the first battery cell 10 may be a square battery cell, and the second battery cell 30 may be a cylindrical battery cell, a hexagonal prism battery cell, an elliptical pillar battery cell, or another shape battery cell.

In some embodiments, the first battery cell 10 is a square battery cell and the second battery cell 30 is a cylindrical battery cell.

The housing of the square battery cell is substantially cuboid, and the housing of the cylindrical battery cell is substantially cylindrical. The cylindrical battery cell has a cylindrical surface. When a plurality of cylindrical battery cells are arranged in the second direction Y, a gap G may be formed between the cylindrical surfaces of the adjacent battery cells.

When the cylindrical battery monomer and the square battery monomer are mixed and arranged, the gap G between the cylindrical battery monomers can provide a space for the expansion of the square battery monomer, so that the expansion force of the square battery monomer is reduced, and the cycle performance of the square battery monomer is improved.

When arranging cylinder battery monomer and square battery monomer, make the free axial perpendicular to first direction X of cylinder battery and second direction Y, like this, the free contact of cylinder battery and square battery is line contact, can reduce the heat transfer area between cylinder battery monomer and the square battery monomer, reduces the heat transfer rate between cylinder battery monomer and the square battery monomer.

In some embodiments, in the battery unit 20, a gap G is provided between any two adjacent second battery cells 30.

The plurality of gaps G may provide more space for the expansion of the first battery cell 10, thereby reducing the expansion force applied to the first battery cell 10, improving the cycle performance of the first battery cell 10, and prolonging the life of the battery 2.

In some embodiments, the first battery cell 10 includes a first case 11 and a first electrode assembly 12 housed within the first case 11. The first case 11 has a hollow structure, and a receiving cavity for receiving the first electrode assembly 12 and an electrolyte is formed inside thereof. The first housing 11 may have various shapes, and illustratively, the first housing 11 has a rectangular parallelepiped shape.

In some embodiments, the first housing 11 includes a first shell 111 and a first end cover 112, the first shell 111 has an opening, and the first end cover 112 is used for covering the opening of the first shell 111.

In some embodiments, the second battery cell 30 includes a second case 31 and a second electrode assembly 32 housed within the second case 31. The second case 31 has a hollow structure, and a receiving chamber for receiving the second electrode assembly 32 and the electrolyte is formed inside thereof. The second housing 31 may have various shapes, and the second housing 31 is illustratively cylindrical.

In some embodiments, the second housing 31 includes a second housing 311 and a second end cap 312, the second housing 311 has an opening, and the second end cap 312 is used for covering the opening of the second housing 311.

The first electrode assembly 12 and the second electrode assembly 32 each include a positive electrode tab, a negative electrode tab, and a separator for insulating the positive electrode tab from the negative electrode tab. The electrode assembly operates by primarily relying on metal ions to move between the positive and negative electrode plates.

In some embodiments, in the battery cell 20, a gap G is formed between the second housings 31 of two adjacent second battery cells 30. Illustratively, in the battery unit 20, a gap G is formed between the second cases 311 of two adjacent second battery cells 30.

In some embodiments, a dimension of the second housing 31 in the third direction Z is larger than a dimension of the second housing 31 in the first direction X, and a dimension of the second housing 31 in the third direction Z is larger than a dimension of the second housing 31 in the second direction Y. The third direction Z is perpendicular to the first direction X and the second direction Y.

In some embodiments, the first battery cell 10 further includes a first electrode terminal 13 and a second electrode terminal 14 disposed at the first case 11. One of the first electrode terminal 13 and the second electrode terminal 14 is electrically connected to a positive electrode tab of the first electrode assembly 12, and the other is electrically connected to a negative electrode tab of the first electrode assembly 12. The first electrode terminal 13 and the second electrode terminal 14 are used to electrically connect the first electrode assembly 12 with an external circuit to achieve charge and discharge of the first electrode assembly 12.

In some embodiments, the first electrode terminal 13 and the second electrode terminal 14 may be disposed on the same side of the first housing 11, or may be disposed on opposite sides of the first housing 11.

In some embodiments, the second battery cell 30 further includes a third electrode terminal 33 and a fourth electrode terminal 34 provided to the second case 31. One of the third electrode terminal 33 and the fourth electrode terminal 34 is electrically connected to the positive electrode tab of the second electrode assembly 32, and the other is electrically connected to the negative electrode tab of the second electrode assembly 32. The third and

fourth electrode terminals

33 and 34 serve to electrically connect the second electrode assembly 32 with an external circuit to enable charging and discharging of the second electrode assembly 32.

In some embodiments, the third electrode terminal 33 and the fourth electrode terminal 34 may be disposed on the same side of the second housing 31, or may be disposed on opposite sides of the second housing 31.

In some embodiments, the first battery cell 10 is a lithium ion battery cell and the second battery cell 30 is a sodium ion battery cell.

Compared with a lithium ion battery monomer, the sodium ion battery monomer has better low temperature resistance, acupuncture resistance, extrusion resistance and other safety performances. Lithium ion battery cells have a higher energy density than sodium ion battery cells.

In the present embodiment, the first battery cell 10 is a lithium ion battery cell to ensure the energy density of the battery 2. The second battery cell 30 employs a sodium ion battery cell to reduce the risk of the second battery cell 30 failing when being pressed by the first battery cell 10. In the present embodiment, the energy density and safety of the battery 2 can be balanced by assembling the lithium ion battery cells and the sodium ion battery cells into a group.

In some embodiments, the first battery cell 10 is a ternary lithium battery cell, and the second battery cell 30 is a sodium ion battery cell or a lithium iron phosphate battery cell.

Compared with a sodium ion battery monomer and a lithium iron phosphate battery monomer, the ternary lithium battery monomer has higher energy density. Compared with a ternary lithium battery monomer, the safety of the sodium ion battery monomer or the iron phosphate lithium battery monomer is better.

In the battery unit 20, all the second battery cells 30 may be sodium-ion battery cells, all the second battery cells 30 may be lithium iron phosphate battery cells, or part of the second battery cells 30 may be sodium-ion battery cells, and part of the second battery cells 30 may be lithium iron phosphate battery cells.

In the present embodiment, the first battery cell 10 is a ternary lithium battery cell to ensure the energy density of the battery 2. The second battery cell 30 is a sodium ion battery cell or a lithium iron phosphate battery cell, so as to reduce the risk of failure of the second battery cell 30 when being squeezed by the first battery cell 10. The present embodiment can balance the energy density and safety of the battery 2.

Fig. 6 is a simplified schematic diagram of a battery 2 according to further embodiments of the present application.

As shown in fig. 6, in some embodiments, the first battery cell 10 includes a first housing 11, and the first housing 11 has a dimension L along the second direction Y ₁ . The number of the second battery cells 30 of the battery unit 20 is n, and the dimension of each second battery cell 30 in the second direction Y is D ₁ 。L ₁ 、D ₁ And n satisfies: l is ₁ ≥（n-1）·D ₁ 。

n is a positive integer greater than 1.

L ₁ Is the largest dimension of the first housing 11 in the second direction Y. Exemplarily, the first housing 11 includes two second surfaces 10b oppositely disposed along the second direction Y, the second surfaces 10b being perpendicular to the second direction Y; l is ₁ The spacing of the two second surfaces 10b in the second direction Y.

D ₁ Is the maximum dimension of the second battery cell 30 in the second direction Y. Exemplarily, D ₁ Which is the maximum dimension of the second housing of the second battery cell 30 in the second direction Y. Optionally, the second battery cell 30 is a cylindrical battery cell, D ₁ Is the diameter of the cylindrical battery cell.

n·D ₁ May be used to characterize the space occupied by the battery cells 20 in the second direction Y; if n.D ₁ If the value of (a) is too large, some of the second battery cells 30 may not overlap with the first battery cell 10 in the first direction X, so that the second battery cells 30 may not be supported and limited by the first battery cell 10. In the examples of the present application, n.D ₁ ≤L ₁ +D ₁ In this way, the dimension of the second direction Y of the overlapping region of the second battery cell 30 at the end of the battery unit 20 in the second direction Y and the first battery cell 10 in the first direction X can be substantially ensured at D ₁ 2 so that each second battery cell 30 of the battery unit 20 can be placed in the second positionA battery cell 10 is effectively supported and restrained.

In some embodiments, the area of the first surface 10a is greater than the area of the second surface 10 b.

Fig. 7 is a simplified schematic diagram of a battery 2 according to further embodiments of the present application.

As shown in fig. 7, in some embodiments, the first battery cell 10 includes a first housing 11, and the first housing 11 has a dimension L along the second direction Y ₁ . The number of the second battery cells 30 of the battery unit 20 is n, and the dimension of each second battery cell 30 in the second direction Y is D ₁ 。L ₁ 、D ₁ And n satisfies: n.D ₁ ≥0.5·L ₁ 。

n·D ₁ May be used to characterize the space occupied by the battery cells 20 in the second direction Y; if n.D ₁ Is too small, the space utilization of the battery cell 20 in the second direction Y is low; in the examples of the present application, n.D ₁ ≥0.5·L ₁ So that the battery cell 20 effectively utilizes the space in the second direction Y.

Fig. 8 is a simplified schematic diagram of a battery 2 according to further embodiments of the present application.

As shown in FIG. 8, in some embodiments, L ₁ 、D ₁ And n satisfies: l is ₁ ≤（n+1）D ₁ 。

n·D ₁ May be used to characterize the space occupied by the battery cells 20 in the second direction Y. In the examples of the present application, n.D ₁ ≥L ₁ -D ₁ So that the battery cells 20 effectively utilize the space in the second direction Y, reducing the loss of the energy density of the battery 2.

Fig. 9 is a simplified schematic diagram of a battery 2 according to another embodiment of the present application.

As shown in FIG. 9, in some embodiments, (n-1). D ₁ ≤L ₁ ≤（n+1）D ₁ 。

In some embodiments, L ₁ =n·D ₁ 。

In some embodiments, the first battery cell 10 includes a first housing 11, the first housing 11 having a dimension L along the first direction X ₂ . Each second battery cell 30 has a dimension D in the first direction X ₂ ，D ₂ ＜2·L ₂ 。

L ₂ Is the largest dimension of the first housing 11 in the first direction X. Exemplarily, the first surface 10a is perpendicular to the first direction X, L ₂ Is the spacing of the two first surfaces 10a along the first direction X.

D ₂ Is the maximum dimension of the second battery cell 30 in the first direction X. Exemplarily, D ₂ Which is the largest dimension of the second housing of the second battery cell 30 in the first direction X. Optionally, the second battery cell 30 is a cylindrical battery cell, D ₁ Is equal to D ₂ 。

D ₂ Is positively correlated with the dimension of the gap G in the first direction X, if D ₂ Too large, it may cause a waste of space, resulting in an insufficient energy density of the battery 2. Examples of the present application ₂ ＜2·L ₂ To reduce the loss of energy density of the battery 2.

In some embodiments, 0.5L ₂ ＜D ₂ ＜2·L ₂ 。

In some embodiments, D ₂ Is equal to L ₂ . In this embodiment, the arrangement of the plurality of battery units 20 and the plurality of first battery cells 10 may be simplified, for example, on the premise that the total number of the first battery cells 10 and the total number of the battery units 20 are fixed, the number of the first battery cells 10 is changed, and the total size of the battery 2 along the first direction X is not changed.

In some embodiments, the battery 2 further includes a functional component 40, at least a portion of the functional component 40 being received in the void G.

The functional component 40 may fill only a part of the gap G, or may fill the gap G. In some examples, the functional component 40 fills the gap G, and the functional component 40 is configured to be compressible such that the functional component 40 is compressed when the first battery cell 10 expands to provide space for the expansion of the first battery cell 10.

The functional component 40 is a component for realizing a specific function in the battery 2, and includes, but is not limited to, a heat exchanger, a heat insulator, a buffer, an adhesive, a sensor, a wire, and the like.

The gap G of the present embodiment can provide a space for the functional part 40, thereby making the overall structure of the battery 2 more compact.

In some embodiments, the functional component 40 includes at least one of a heat exchanger, a thermal insulator, a buffer, and an adhesive.

In some examples, the heat exchange member may be used to exchange heat with the first battery cell 10. A flow channel for a heat exchange medium can be arranged in the heat exchange member, and when the heat exchange medium flows through the heat exchange member, the heat exchange medium can exchange heat with the first battery cell 10 through the heat exchange member, so that the first battery cell 10 can work at a proper temperature. Alternatively, the heat exchange member may be used to exchange heat with the second battery cell 30.

In some examples, at least a portion of the thermal insulation member is positioned between two adjacent second battery cells 30 in the second direction Y to reduce heat transfer between the two second battery cells 30. Optionally, the thermal insulation may also serve to block heat transfer between the first battery cell 10 and the second battery cell 30.

In some examples, the buffer is configured to be compressible. The buffer member can limit the second battery cell 30 in the second direction Y, and the risk of the second battery cell 30 shifting in the second direction Y is reduced. The buffer member may be compressed when the first battery cell 10 expands to provide a space for the expansion of the first battery cell 10.

In some examples, the adhesive member may connect two adjacent second battery cells 30 to improve the strength of the entire battery unit 20. Alternatively, the adhesive member may also adhere the second battery cell 30 and the first battery cell 10.

Fig. 10 is a schematic top view of the battery 2 shown in fig. 3.

As shown in fig. 10, in some embodiments, a battery unit 20 is disposed between at least two adjacent first battery cells 10.

The two first battery cells 10 are adjacent to each other means that no other first battery cell 10 is disposed between the two first battery cells 10.

One or more battery cells 20 may be provided between two adjacent first battery cells 10.

In the embodiment of the present application, the gap G of the battery cell 20 may provide a space for the expansion of the first battery cell 10 at both sides thereof, thereby improving the cycle performance of the first battery cell 10.

In some embodiments, a battery unit 20 is disposed between any two adjacent first battery cells 10.

The battery unit 20 may separate the first battery cells 10 to prevent the adjacent first battery cells 10 from being directly pressed against each other. The gap G of the battery cell 20 may provide a space for the expansion of each first battery cell 10, thereby improving the cycle performance of the first battery cell 10 and extending the life of the battery 2.

In some embodiments, the battery cells 20 are provided in plurality, and the plurality of battery cells 20 and the plurality of first battery cells 10 are alternately arranged in the first direction X.

One battery unit 20 is disposed between any two adjacent first battery cells 10, and one first battery cell 10 is disposed between any two adjacent battery units 20.

Each battery unit 20 may provide a space for the expansion of the first battery cell 10 adjacent thereto, which may reduce the superposition of the expansion amounts of the plurality of first battery cells 10 in the first direction X, improve the cycle performance of the first battery cell 10, and prolong the life of the battery 2.

Fig. 11 is a schematic structural diagram of a battery 2 according to another embodiment of the present application.

As shown in fig. 11, in some embodiments, at least one end of the battery 2 in the first direction X is provided as a battery unit 20.

When the battery 2 receives an external impact at one side in the first direction X, the voids G of the battery cell 20 may function to disperse stress, thereby reducing the risk of failure of the first battery cell 10.

In some embodiments, the second battery cell 30 is a cylindrical battery cell. Compared with a square battery monomer, the cylindrical battery monomer has better mechanical property and stronger anti-collision capacity. This embodiment sets up the cylinder battery monomer in the tip of battery 2, can reduce the risk that battery 2 became invalid, improves battery 2's stability.

In some embodiments, the second battery cell 30 is configured as a sodium ion battery cell or a lithium iron phosphate battery cell with better safety performance.

In some embodiments, both ends of the battery 2 in the first direction X are provided as the battery cells 20. The battery unit 20 may protect the first battery cell 10 from both ends to reduce the risk of failure of the first battery cell 10.

Fig. 12 is a schematic structural diagram of a battery 2 according to another embodiment of the present application.

As shown in fig. 12, the battery cell 20 is provided in plurality, and the plurality of battery cells 20 and the plurality of first battery cells 10 are stacked in the first direction X.

The present embodiment does not limit the stacking order of the plurality of battery units 20 and the first battery cells 10, for example, the plurality of battery units 20 and the plurality of first battery cells 10 may be alternately arranged along the first direction X, the plurality of battery units 20 may be continuously arranged, the plurality of first battery cells 10 may be continuously arranged, or the battery units 20 and the first battery cells 10 may be arranged in other arrangements. The number of the second battery cells 30 of the plurality of battery units 20 may be the same or different.

In some embodiments, in the first direction X, the number of the second battery cells 30 of the plurality of battery units 20 tends to decrease first and then increase.

When the plurality of battery units 20 are arranged in an array, the number of the second battery cells 30 of the plurality of battery units 20 is not required to be different as long as the tendency that the number of the second battery cells 30 is increased after being decreased is satisfied. Illustratively, the number of the second battery cells 30 of the partially adjacent battery cells 20 is the same.

The plurality of battery cells 20 and the plurality of first battery cells 10 are stacked in the first direction X, and the amount of expansion of the plurality of first battery cells 10 is superimposed toward the middle of the battery 2, that is, the closer to the middle, the greater the expansion force the first battery cell 10 receives. The embodiment of the application reduces the number of the second battery cells 30 of the battery unit 20 in the middle of the battery 2, so as to provide more space for the expansion of the first battery cell 10, reduce the expansion force applied to the first battery cell 10, and improve the performance of the first battery cell 10.

In some embodiments, the first battery cell 10 includes a first case and a first electrode terminal 13 disposed at the first case, the first electrode terminal 13 being disposed at one side of the first case along a third direction Z perpendicular to the first direction X and the second direction Y.

In some embodiments, the first case includes two third surfaces 10c oppositely disposed along the third direction Z, and the first electrode terminal 13 protrudes from one of the third surfaces 10 c.

The area of the first surface 10a is larger than that of the second surface 10b, and the area of the first surface 10a is larger than that of the third surface 10 c.

In some embodiments, the first battery cell 10 further includes a second electrode terminal 14, and the second electrode terminal 14 and the first electrode terminal 13 are disposed on the same side of the first housing along the third direction Z.

Fig. 13 is a schematic structural diagram of a battery 2 according to another embodiment of the present application.

As shown in fig. 13, in some embodiments, the first battery cell 10 includes a first case and a first electrode terminal 13 disposed at the first case, the first electrode terminal 13 being disposed at one side of the first case in the second direction Y.

The first housing includes two second surfaces 10b oppositely disposed in the second direction Y, and the first electrode terminal 13 protrudes from one of the second surfaces 10 b.

Fig. 14 is a schematic structural diagram of a battery 2 according to another embodiment of the present application; fig. 15 is another structural schematic view of the battery 2 of fig. 14, in which the frame structure 60 is omitted; fig. 16 is a schematic view of the battery shown in fig. 15 at another angle.

As shown in fig. 14 to 16, in some embodiments, the battery 2 further includes a plurality of bus members 50, and the plurality of bus members 50 are used to electrically connect the plurality of first battery cells 10 and the plurality of second battery cells 30 of the battery unit 20.

The plurality of bus members 50 connect the plurality of first battery cells 10 and the plurality of second battery cells 30 in series, in parallel, or in series-parallel, which means that the plurality of first battery cells 10 and the plurality of second battery cells 30 are connected in series and in parallel.

In some embodiments, the battery 2 further includes a frame structure 60, and the frame structure 60 is used to support and fix the first battery cell 10 and the second battery cell 30.

In some embodiments, the frame structure 60 comprises two end plates 61 and two side plates 62, the two end plates 61 being arranged along the first direction X, the two side plates 62 connecting the two end plates 61 to form the substantially rectangular frame structure 60.

The battery unit 20 and the plurality of first battery cells 10 are stacked between two end plates 61 in the first direction X, and the two end plates 61 clamp the plurality of battery units 20 and the plurality of first battery cells 10.

In some embodiments, the first battery cell 10 includes first and

second electrode terminals

13 and 14 having opposite polarities, and the second battery cell 30 includes third and

fourth electrode terminals

33 and 34 having opposite polarities. The plurality of bus members 50 include a first bus member 51, and the first bus member 51 is used to electrically connect the third electrode terminals 33 of the plurality of second battery cells 30 of the battery unit 20 with the first electrode terminals 13.

The first bus member 51 connects the third electrode terminals 33 of the plurality of second battery cells 30 of the battery unit 20 to connect the plurality of second battery cells 30 of the battery unit 20 in parallel. The first bus member 51 is also connected to the first electrode terminal 13 of the first battery cell 10, so that the first battery cell 10 can be connected in series or in parallel with the battery unit 20.

In some embodiments, the polarity of the third electrode terminal 33 and the first electrode terminal 13 is opposite. The first bus member 51 connects the plurality of second battery cells 30 of the battery unit 20 in series with the first battery cell 10.

In some embodiments, the first electrode terminal 13 is located at one end of the first battery cell 10 in a third direction Z perpendicular to the first direction X and the second direction Y. The third electrode terminal 33 is located at one end of the second battery cell 30 facing away from the first electrode terminal 13 in the third direction Z. The first bus member 51 includes a first connection part 511, a second connection part 512, and a third connection part 513, the first connection part 511 is used to connect the first electrode terminals 13, the third connection part 513 is used to connect the third electrode terminals 33 of the plurality of second battery cells 30 of the battery unit 20, the second connection part 512 is used to connect the first connection part 511 and the third connection part 513, and both the first connection part 511 and the third connection part 513 are bent with respect to the second connection part 512.

In the present embodiment, the first bus member 51 having the bent structure may connect the first electrode terminal 13 and the third electrode terminal 33 at opposite sides, thereby electrically connecting the first battery cell 10 and the plurality of second battery cells 30 of the battery unit 20.

In some embodiments, the plurality of bus members 50 further includes a second bus member 52, the second bus member 52 for electrically connecting the fourth electrode terminals 34 of the plurality of second battery cells 30 of the battery unit 20 with the second electrode terminals 14.

In some embodiments, the first electrode terminal 13 and the second electrode terminal 14 are located at the same end of the first battery cell 10 along the third direction Z, the third electrode terminal 33 is located at an end of the second battery cell 30 facing away from the first electrode terminal 13 along the third direction Z, and the fourth electrode terminal 34 is located at an end of the second battery cell 30 facing the first electrode terminal 13 along the third direction Z.

Illustratively, the battery unit 20 is provided with two first battery cells 10 on both sides in the first direction X, the first bus member 51 electrically connects the third electrode terminals 33 of the plurality of second battery cells 30 of the battery unit 20 with the first electrode terminal 13 of one first battery cell 10, and the second bus member 52 electrically connects the fourth electrode terminals 34 of the plurality of second battery cells 30 of the battery unit 20 with the second electrode terminal 14 of another first battery cell 10. At this time, the first and

second bus members

51 and 52 connect the battery unit 20 and the two first battery cells 10 in series.

In some embodiments, since the second electrode terminal 14 and the fourth electrode terminal 34 are located at the same side of the battery 2 in the third direction Z, the second bus member 52 does not need to be bent. Illustratively, the second bus member 52 is an L-shaped flat plate.

Fig. 17 is a schematic structural diagram of a battery 2 according to another embodiment of the present application.

As shown in fig. 17, in some embodiments, the battery cells 20 may be disposed at both ends and a middle portion of the battery 2 in the first direction X.

In some embodiments, some of the first battery cells 10 are continuously disposed in the first direction X. Among the first battery cells 10, no battery unit 20 exists between adjacent first battery cells 10.

Illustratively, the plurality of bus members further includes a third bus member 53, and the third bus member 53 is used for connecting the first battery cells 10 arranged in series, in parallel, or in series-parallel.

Fig. 18 is a schematic structural diagram of a battery 2 according to another embodiment of the present application.

As shown in fig. 18, in some embodiments, the battery 2 includes a plurality of battery columns 70, each battery column 70 including a plurality of battery cells 20 and a plurality of first battery cells 10 stacked in the first direction X.

The plurality of battery columns 70 are arranged in a direction perpendicular to the first direction X. In some examples, the arrangement direction of the plurality of battery columns 70 is parallel to the arrangement direction of the plurality of second battery cells 30 of the battery unit 20. In another example, the arrangement direction of the plurality of battery columns 70 is perpendicular to the arrangement direction of the plurality of second battery cells 30 of the battery unit 20.

Fig. 19 is a simplified schematic diagram of a battery 2 according to further embodiments of the present application.

As shown in fig. 19, in some embodiments, the second battery cell 30 may be another shaped battery cell. For example, the second battery cell 30 has a racetrack shape, in other words, a projection of the second housing of the second battery cell 30 in the third direction has a racetrack shape.

Fig. 20 is a simplified schematic diagram of a battery 2 according to further embodiments of the present application.

As shown in fig. 20, in some embodiments, the second battery cell 30 may also be a prismatic battery 2. At least two adjacent second battery cells 30 are spaced apart to form a gap G.

According to some embodiments of the present application, there is also provided an electric device, including the battery of any of the above embodiments, the battery is used for providing electric energy for the electric device. The powered device may be any of the aforementioned battery-powered devices or systems.

According to some embodiments of the present application, referring to fig. 9 and 10, the present application provides a battery 2 including a plurality of first battery cells 10 and a plurality of battery units 20, the plurality of battery units 20 being alternately stacked with the plurality of first battery cells 10 in a first direction X. The battery unit 20 includes a plurality of second battery cells 30 arranged in a second direction Y, which is perpendicular to the first direction X. The first battery cell 10 is a square battery cell, and the second battery cell 30 is a cylindrical battery cell.

In the first direction X, each of the second battery cells 30 at least partially overlaps the first battery cell 10. In the second direction Y, a gap G is provided between any two second battery cells 30 of the battery unit 20.

The gap G is internally provided with a heat exchange piece.

The first battery cell 10 includes a first housing 11, and the first housing 11 has a dimension L in the second direction Y ₁ . The number of the second battery cells 30 of the battery unit 20 is n, and the diameter of each second battery cell 30 is D ₁ 。L ₁ 、D ₁ And n satisfies: (n-1). D ₁ ≤L ₁ ≤（n+1）D ₁ . The dimension of the first housing 11 along the first direction X is L ₂ ，D ₁ =L ₂ 。

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

1. A battery, comprising:

a plurality of first battery cells; and

a battery unit stacked with a plurality of the first battery cells in a first direction, the battery unit including a plurality of second battery cells arranged in a second direction, the second direction being perpendicular to the first direction, the first battery cells and the second battery cells having different shapes;

in the first direction, each of the second battery cells at least partially overlaps the first battery cell; in the second direction, a gap is arranged between at least two adjacent second battery cells of the battery unit.

2. The battery of claim 1, wherein the first battery cell has two first surfaces disposed opposite to each other along the first direction, the first surfaces being planar;

at least part of the outer surface of the second battery monomer is an arc-shaped surface, and the arc-shaped surface is used for being connected with the first surface;

in the second direction, the gap is formed between the arc-shaped surfaces of two adjacent second battery cells.

3. The battery of claim 2, wherein the first battery cell is a prismatic battery cell and the second battery cell is a cylindrical battery cell.

4. The battery according to claim 1, wherein the gap is provided between any two adjacent second battery cells in the battery unit.

5. The battery according to any one of claims 1 to 4,

the first battery cell comprises a first shell, and the size of the first shell along the second direction is L ₁ ；

The number of the second battery cells of the battery unit is n, and the size of each second battery cell along the second direction is D ₁ ，L ₁ 、D ₁ And n satisfies:

L ₁ ≥（n-1）·D ₁ 。

6. the battery according to any one of claims 1 to 4,

n·D ₁ ≥0.5·L ₁ 。

7. the battery of claim 6, wherein L is ₁ 、D ₁ And n satisfies: l is ₁ ≤（n+1）D ₁ 。

8. The battery according to any one of claims 1 to 4,

the first battery cell includes a first housing having a dimension L along the first direction ₂ ；

The dimension of each second battery cell along the first direction is D ₂ ，D ₂ ＜2·L ₂ 。

9. The battery of any of claims 1-4, further comprising a functional component, at least a portion of which is received in the void.

10. The battery of claim 9, wherein the functional component comprises at least one of a heat exchanger, a thermal insulator, a buffer, and an adhesive.

11. The battery according to any one of claims 1-4, wherein the battery unit is disposed between at least two adjacent first battery cells.

12. The battery of claim 11, wherein the battery unit is disposed between any two adjacent first battery cells.

13. The battery according to claim 12, wherein the battery cell is provided in plurality, and the plurality of battery cells and the plurality of first battery cells are alternately arranged in the first direction.

14. The battery according to any one of claims 1 to 4, wherein at least one end of the battery in the first direction is provided as the battery cell.

15. The battery according to claim 14, wherein both ends of the battery in the first direction are provided as the battery cells.

16. The battery according to any one of claims 1 to 4, wherein the battery cell is provided in plurality, and a plurality of the battery cells and a plurality of the first battery cells are stacked in the first direction.

17. The battery of claim 16, wherein the number of the second battery cells of the plurality of battery units tends to decrease first and then increase in the first direction.

18. The battery according to any one of claims 1 to 4, wherein the first battery cell includes a first case and a first electrode terminal provided to the first case, the first electrode terminal being provided to one side of the first case in the second direction.

19. The battery according to any one of claims 1 to 4, wherein the first battery cell comprises a first case and a first electrode terminal provided to the first case, the first electrode terminal being provided to one side of the first case in a third direction perpendicular to the first direction and the second direction.

20. The battery of any of claims 1-4, further comprising a plurality of bus members for electrically connecting a plurality of the first cells and a plurality of the second cells of the battery unit.

21. The battery of claim 20,

the first battery cell comprises a first electrode terminal and a second electrode terminal with opposite polarities, and the second battery cell comprises a third electrode terminal and a fourth electrode terminal with opposite polarities;

the plurality of bus members include a first bus member for electrically connecting third electrode terminals of the second battery cells of the battery unit with the first electrode terminals.

22. The battery of claim 21, wherein the third electrode terminal and the first electrode terminal are of opposite polarity.

23. The battery of claim 21, wherein the first electrode terminal is located at one end of the first battery cell in a third direction, the third direction being perpendicular to the first and second directions;

the third electrode terminal is positioned at one end of the second battery cell, which is away from the first electrode terminal along the third direction;

the first bus member includes a first connection part for connecting the first electrode terminals, a second connection part for connecting the third electrode terminals of the second battery cells, and a third connection part for connecting the first connection part and the third connection part, and both the first connection part and the third connection part are bent with respect to the second connection part.

24. The battery according to any one of claims 1-4, wherein the first cell is a lithium ion cell and the second cell is a sodium ion cell.

25. The battery according to any one of claims 1 to 4, wherein the first battery cell is a ternary lithium battery cell, and the second battery cell is a sodium ion battery cell or a lithium iron phosphate battery cell.

26. An electrical device comprising a battery as claimed in any one of claims 1 to 25 for providing electrical energy.