CN217444527U - Battery and electric device - Google Patents

Abstract

The present application discloses a battery and an electrical device. The battery of the embodiment of the present application includes a plurality of first battery cells and battery cells. The battery cells are stacked with the plurality of first battery cells along the first direction. The battery cell includes a plurality of second battery cells arranged along a second direction, the second direction being 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 provided between at least two adjacent second battery cells of the battery cells. The voids can provide space for the expansion of the first battery cell, thereby reducing the expansion force received by the first battery cell, improving the cycle performance of the first battery cell, and increasing the life of the battery.

Description

Batteries and Electrical Devices

technical field

The present application relates to the field of batteries, and in particular, to a battery and an electrical device.

Background technique

Batteries are widely used in electronic devices such as mobile phones, laptops, battery cars, electric cars, electric planes, electric boats, electric toy cars, electric toy boats, electric toy planes and power tools, etc.

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

Utility model content

The present application provides a battery and an electrical device that 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 battery cells. The battery cells are stacked with the plurality of first battery cells along the first direction. The battery cell includes a plurality of second battery cells arranged along a second direction, the second direction being 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 provided between at least two adjacent second battery cells of the battery cells.

In the above technical solution, since each second battery cell has a portion overlapping with the first battery cell in the first direction, each second battery cell can limit the movement of the first battery cell in the first direction. deformation to improve the morphology of the first battery cell and improve the overall strength of the battery. In this embodiment, a plurality of first battery cells and a plurality of second battery cells are mixed and arranged, so that a gap is formed between at least two second battery cells, and the gap can provide expansion of the first battery cell. Therefore, the expansion force of the first battery cell is reduced, the cycle performance of the first battery cell is improved, and the life of the battery is increased.

In some embodiments, the first battery cell has two first surfaces oppositely disposed along the first direction, and the first surfaces are flat. At least part of the outer surface of the second battery cell is an arcuate surface, and the arcuate surface is used for connecting with the first surface. In the second direction, a gap is formed between the arc surfaces of two adjacent second battery cells.

In the above technical solution, the arc-shaped surface is connected to the first surface, which can reduce the heat transfer area between the first battery cell and the second battery cell, and reduce the heat transfer area between the first battery cell and the second battery cell. When the thermal runaway occurs in a battery cell, the risk of thermal diffusion is reduced and the safety of the battery is improved.

In some embodiments, the first battery cells are prismatic battery cells and the second battery cells are cylindrical battery cells.

In the above technical solution, when the cylindrical battery cells and the prismatic battery cells are mixed and arranged, the space between the cylindrical battery cells can provide space for the expansion of the prismatic battery cells, thereby reducing the expansion force of the prismatic battery cells. Improve the cycle performance of prismatic battery cells.

In some embodiments, in the battery cells, a gap is provided between any two adjacent second battery cells. The plurality of voids can provide more space for the expansion of the first battery cell, thereby reducing the expansion force received by the first battery cell, improving the cycle performance of the first battery cell, and increasing the life of the battery.

In some embodiments, the first battery cell includes a first casing, and the first casing has a dimension L ₁ along the second direction. 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 satisfy: L ₁ ≥(n-1)·D ₁ .

In the above technical solution, the size of the area along the second direction where the second battery cell and the first battery cell located at the end of the battery cell along the second direction overlap in the first direction can be roughly guaranteed to be D ₁ /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 casing, and the first casing has a dimension L ₁ along the second direction. The number of the second battery cells of the battery unit is n, the size of each second battery cell along the second direction is D ₁ , and L ₁ , D ₁ and n satisfy: n·D ₁ ≥0.5·L ₁ .

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

In some embodiments, L ₁ , D ₁ and n satisfy: L ₁ ≦(n+1)D ₁ .

The above technical solution enables the battery unit to effectively utilize the space in the second direction, thereby reducing the loss of the energy density of the battery.

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

_D2 is positively related to the size of the void along the first direction. If _D2 is too large, space may be wasted, resulting in insufficient energy density of the battery. The above technical solution makes D ₂ <2·L ₂ to reduce the loss of energy density of the battery.

In some embodiments, the battery further includes a functional component, at least a portion of which is housed 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 exchange member, a thermal insulation member, a buffer member, and an adhesive member.

In some embodiments, a battery cell is provided between at least two adjacent first battery cells. The voids of the battery cells can provide space for expansion of the first battery cells on both sides of the battery cells, thereby improving the cycle performance of the first battery cells.

In some embodiments, a battery cell is provided between any two adjacent first battery cells. The battery cells may separate the first battery cells to prevent adjacent first battery cells from being directly pressed against each other. The voids of the battery cells can provide space for the expansion of each first battery cell, thereby improving the cycle performance of the first battery cell and prolonging the life of the battery.

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

In some embodiments, at least one end of the battery along the first direction is configured as a battery cell. When one side of the battery in the first direction receives an external impact, the voids of the battery cells can play a role in dispersing stress, thereby reducing the risk of failure of the first battery cell.

In some embodiments, both ends of the battery along the first direction are provided as battery cells. The battery cell 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 cells are provided in plurality, and the plurality of battery cells and the plurality of first battery cells are stacked along the first direction.

In some embodiments, in the first direction, the number of the second battery cells of the plurality of battery cells first decreases and then increases.

The plurality of battery cells and the plurality of first battery cells are stacked along the first direction, and the expansion amount of the plurality of first battery cells will be superimposed toward the middle of the battery. The greater the expansion force. The above technical solution reduces the number of the second battery cells of the battery cells in the middle of the battery, so as to provide more space for the expansion of the first battery cells, reduce the expansion force received by the first battery cells, and improve the first battery cells. body performance.

In some embodiments, the first battery cell includes a first casing and a first electrode terminal disposed on the first casing, and the first electrode terminal is disposed on one side of the first casing along the second direction.

In some embodiments, the first battery cell includes a first casing and a first electrode terminal disposed on the first casing, the first electrode terminal is disposed on one side of the first casing along a third direction, and the third direction is perpendicular to the first casing. one direction and the second direction.

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

In some embodiments, the first battery cell includes a first electrode terminal and a second electrode terminal of opposite polarity, and the second battery cell includes a third electrode terminal and a fourth electrode terminal of opposite polarity. The plurality of bus components includes a first bus component for electrically connecting the third electrode terminals of the plurality of second battery cells of the battery cells with the first electrode terminals.

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

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

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

In the above-mentioned technical solution, the first confluence member with the bending structure can connect the first electrode terminal and the third electrode terminal on opposite sides, thereby realizing the connection between the first battery cell and the plurality of second battery cells of the battery cell. electrical connection.

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 cell adopts a lithium-ion battery cell to ensure the energy density of the battery. The second battery cell adopts a sodium-ion battery cell, so as to reduce the risk of failure of the second battery cell when being squeezed by the first battery cell. In this embodiment, the energy density and safety of the battery can be balanced by assembling the lithium-ion battery cells and the sodium-ion battery cells into groups.

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 unit adopts a ternary lithium battery unit to ensure the energy density of the battery. The second battery cell adopts 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 when it is squeezed by the first battery cell.

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

Description of drawings

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

1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

FIG. 2 is an exploded schematic diagram of a battery provided by some embodiments of the present application;

3 is a schematic structural diagram of a battery provided by some embodiments of the present application;

FIG. 4 is an exploded schematic diagram of the first battery cell shown in FIG. 3;

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

6 is a simplified schematic diagram of a battery provided by other embodiments of the present application;

FIG. 7 is a simplified schematic diagram of a battery provided by other embodiments of the present application;

FIG. 8 is a simplified schematic diagram of a battery provided by other embodiments of the present application;

FIG. 9 is a simplified schematic diagram of a battery provided by other embodiments of the present application;

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

11 is a schematic structural diagram of a battery provided by other embodiments of the present application;

12 is a schematic structural diagram of a battery provided by other embodiments of the present application;

13 is a schematic structural diagram of a battery provided by other embodiments of the present application;

14 is a schematic structural diagram of a battery provided by other embodiments of the present application;

FIG. 15 is another schematic structural diagram of the battery of FIG. 14 , wherein the frame structure is omitted;

FIG. 16 is a schematic structural diagram of the battery shown in FIG. 15 from another angle;

17 is a schematic structural diagram of a battery provided by other embodiments of the present application;

18 is a schematic structural diagram of a battery provided by other embodiments of the present application;

19 is a simplified schematic diagram of a battery provided by other embodiments of the present application;

FIG. 20 is a simplified schematic diagram of batteries provided by other embodiments of the present application.

Reference numerals for specific embodiments are as follows:

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

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

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

40, functional component; 50, confluence part; 51, first confluence part; 511, first connection part; 512, second connection part; 513, third connection part; 52, second confluence part; 53, third confluence Parts; 60, frame structure; 61, end plate; 62, side plate; 70, battery column;

G, gap; X, first direction; Y, second direction; Z, third direction.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, 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. Some embodiments are claimed, but not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the specification of the application are only for describing specific implementations The purpose of this example is not to limit the application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary and secondary relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "attached" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

The term "and/or" in this application is only an association relationship to describe associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, independently There are three cases of B. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

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

The appearance of "plurality" in this application refers to two or more (including two).

In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of being approximately parallel in the conventional knowledge in engineering; meanwhile, the term "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of being approximately parallel in the conventional knowledge in engineering. vertical case.

In this application, the battery cells may include lithium-ion battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., which are not limited in the embodiments of this application. .

The battery mentioned in the embodiments of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity. A battery may generally include a case for enclosing one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes a casing and an electrode assembly accommodated in the casing. The electrode assembly includes a positive electrode piece, a negative electrode piece and a separator. The battery cell mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode tab, and the positive electrode current collector is coated with a positive electrode active material layer. , the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab, and the negative electrode current collector is coated with a negative electrode active material layer. , the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon or the like. The material of the spacer may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).

Since battery cells expand during charge-discharge cycles, adjacent battery cells exert expansion force on 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 will be pressed out, affecting the cycle performance of the battery cells.

In view of this, the embodiments of the present application provide a battery, in which a plurality of first battery cells and a plurality of second battery cells are mixed and arranged, so that at least two adjacent second battery cells are formed between The gap can provide space for the expansion of the first battery cell, thereby reducing the expansion force received by the first battery cell and improving the cycle performance of the first battery cell.

The technical solutions described in the embodiments of the present application are applicable to electric devices using batteries.

Electrical devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and power tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, spacecraft, etc.; electric toys include fixed Electric toys that are portable or mobile, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting power tools, grinding power tools, assembling power tools and railway power tools, such as, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical device.

In the following embodiments, for the convenience of description, the electric device is a vehicle as an example for description.

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

As shown in FIG. 1 , the interior of the vehicle 1 is provided with a battery 2 , and the battery 2 may be provided at the bottom, head or tail of the vehicle 1 . The battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .

The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to supply power to the motor 4, for example, for starting, navigating, and driving the vehicle 1 for work power requirements.

In some embodiments of the present application, the battery 2 can not only be used as the operating power source of the vehicle 1 , but can also be used as the driving power source of the vehicle 1 to provide driving power for the vehicle 1 instead of or partially instead of fuel or natural gas.

FIG. 2 is an exploded schematic diagram of a battery provided by some embodiments of the present application.

As shown in FIG. 2 , the battery 2 includes a case 5 and battery cells (not shown in FIG. 2 ), and the battery cells are accommodated in the case 5 .

The box body 5 is used for accommodating the battery cells, and the box body 5 can have various structures. In some embodiments, the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, and the first box body part 5a and the second box body part 5b The two box parts 5b together define a accommodating space 5c for accommodating the battery cells. The second box portion 5b may be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a is covered with the opening side of the second box portion 5b to form an accommodating space 5c The first box part 5a and the second box part 5b can also be a hollow structure with one side open, and the opening side of the first box part 5a is covered with the opening side of the second box part 5b. , so as to form the box body 5 with the accommodating space 5c. Of course, the first case portion 5a and the second case portion 5b may be in various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the airtightness after the first case part 5a and the second case part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., can also be arranged between the first case part 5a and the second case part 5b .

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

In the battery 2, there are a plurality of battery cells, and the plurality of battery cells can be connected in series or in parallel or in a mixed connection. A mixed connection means that the plurality of battery cells have both a series connection and a parallel connection. Multiple battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of multiple battery cells can be accommodated in the box 5; of course, multiple battery cells can also be connected in series or in parallel or The battery modules 6 are formed in a mixed connection, and a plurality of battery modules 6 are connected in series or in parallel or in a mixed connection to form a whole, and are accommodated in the box 5 .

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

As shown in FIGS. 3 to 5 , an embodiment of the present application provides a battery 2 , which includes a plurality of first battery cells 10 and battery cells 20 . The battery cells 20 are stacked along the first direction X with the plurality of first battery cells 10 . The battery cell 20 includes a plurality of second battery cells 30 arranged along a second direction Y, which is perpendicular to the first direction X. As shown in FIG. In the first direction X, each second battery cell 30 at least partially overlaps with 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 cells 20 .

The number of battery cells 20 may be one or a plurality of them.

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

In other examples, there are a plurality of battery cells 20 , and the plurality of battery cells 20 and the plurality of first battery cells 10 are stacked along the first direction X. This example does not limit the order in which the battery cells 20 and the first battery cells 10 are stacked. For example, a plurality of battery cells 20 and a plurality of first battery cells 10 may be alternately arranged along the first direction X, or a plurality of The battery cells 20 are arranged in series, the plurality of first battery cells 10 are arranged in series, and the battery cells 20 and the first battery cells 10 may also be arranged in other arrangements. The number of the second battery cells 30 of the plurality of battery cells 20 may be the same or different.

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

The first battery cell 10 and the second battery cell 30 may use the same chemical system, or may use different chemical systems. The chemical system targets the positive active material of the battery cell. Exemplarily, the first battery cells 10 may be sodium-ion battery cells, lithium-ion battery cells, magnesium-ion battery cells or other metal-ion battery cells, and the second battery cells 30 may be sodium-ion battery cells , lithium ion battery cells, magnesium ion battery cells or other metal ion battery cells. Lithium ion battery cells include but are not limited to lithium nickel cobalt manganese system battery cells, lithium iron phosphate battery cells, lithium cobalt oxide battery cells, lithium manganese iron phosphate battery cells, and lithium nickelate battery cells Or battery cells of other systems.

In some examples, the projection of the second battery cell 30 along the first direction X partially overlaps the projection of the first battery cell 10 along 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 size of the first battery cell 10 along the second direction Y is larger than the size of the second battery cell 30 along the second direction Y, so that each second battery cell 30 exists in the first direction with the first battery cell 10 The overlapping part on the X.

In the two adjacent second battery cells 30 , in the second direction Y, the gap G separates at least part of one second battery cell 30 from at least part of the other second battery cell 30 . In other words, at least a portion of the 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, in the second direction Y, the gap G only separates a portion of one second battery cell 30 from the other second battery cell 30 ; that is, two adjacent second battery cells 30 may be in contact. In other examples, in two adjacent second battery cells 30, in the second direction Y, the gap G completely separates one second battery cell 30 from the other second battery cell 30, That is, two adjacent second battery cells 30 are not in contact.

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

Since each second battery cell 30 has a portion overlapping with the first battery cell 10 in the first direction X, each second battery cell 30 can restrain the first battery cell 10 in the first direction X to improve the morphology 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 mixed and arranged, so that a gap G is formed between at least two second battery cells 30, and the gap G can be the first battery The expansion of the cells 10 provides space, thereby reducing the expansion force received by the first battery cells 10 , improving the cycle performance of the first battery cells 10 , and increasing the life of the battery 2 .

In some embodiments, the first battery cells 10 adjacent to the battery cells 20 cover the gap G from one side of the gap G along 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 flat. At least part of the outer surface 30a of the second battery cell 30 is an arc-shaped surface, and the arc-shaped surface is used for connecting with the first surface 10a. In the second direction Y, a gap G is formed between the arc surfaces of two adjacent second battery cells 30 .

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

The arc-shaped surface may directly abut with the first surface 10a, or may be connected to the first surface 10a through other structures. Exemplarily, the arc-shaped surface may be adhered to the first surface 10a by glue.

When the arc-shaped surface is in contact with the first surface 10a, the two are approximately in line contact or point contact. In this embodiment, the arc-shaped surface is connected with the first surface 10a, which can reduce the size of the first battery cell 10 and the second battery. The heat transfer area between the cells 30 reduces the heat transfer rate between the first battery cell 10 and the second battery cell 30. When a battery cell is thermally out of control, the risk of thermal diffusion is reduced and the battery is improved. 2 security.

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, which can make the shape and size of the gap G more flexible.

Exemplarily, the shape of the first battery cell 10 refers to the shape of the outer shell of the first battery cell 10 , and the shape of the second battery cell 30 refers to the shape of the outer shell of the second battery cell 30 .

Exemplarily, 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 column battery cell, an elliptical column battery cell or other shaped battery cells.

In some embodiments, the first battery cells 10 are square battery cells, and the second battery cells 30 are cylindrical battery cells.

The outer shell of the square battery cell is generally in the shape of a cuboid, and the outer shell of the cylindrical battery cell is generally in the shape of a cylinder. Cylindrical battery cells have cylindrical surfaces. When a plurality of cylindrical battery cells are arranged along the second direction Y, a gap G is formed between the cylindrical surfaces of adjacent battery cells.

When the cylindrical battery cells and the prismatic battery cells are mixed together, the gap G between the cylindrical battery cells can provide space for the expansion of the prismatic battery cells, thereby reducing the expansion force of the prismatic battery cells and improving the prismatic battery cells. circulatory performance of the body.

When arranging the cylindrical battery cells and the prismatic battery cells, the axial direction of the cylindrical battery cells is perpendicular to the first direction X and the second direction Y, so that the contact between the cylindrical battery cells and the prismatic battery cells is line contact, The heat transfer area between the cylindrical battery cells and the prismatic battery cells can be reduced, and the heat transfer rate between the cylindrical battery cells and the prismatic battery cells can be reduced.

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

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

In some embodiments, the first battery cell 10 includes a first casing 11 and a first electrode assembly 12 accommodated in the first casing 11 . The first casing 11 is a hollow structure, and a accommodating cavity for accommodating the first electrode assembly 12 and the electrolyte is formed therein. The first housing 11 can be in various shapes, for example, the first housing 11 is in the shape of a rectangular parallelepiped.

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

In some embodiments, the second battery cell 30 includes a second casing 31 and a second electrode assembly 32 accommodated in the second casing 31 . The second casing 31 is a hollow structure, and a accommodating cavity for accommodating the second electrode assembly 32 and the electrolyte is formed therein. The second housing 31 may have various shapes, for example, the second housing 31 is cylindrical.

In some embodiments, the second housing 31 includes a second shell 311 and a second end cover 312 , the second shell 311 has an opening, and the second end cover 312 is used to cover the opening of the second shell 311 .

Both the first electrode assembly 12 and the second electrode assembly 32 include a positive electrode piece, a negative electrode piece and a separator, and the separator is used to insulate and isolate the positive electrode piece and the negative electrode piece. The electrode assembly mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work.

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

In some embodiments, the dimension of the second housing 31 along the third direction Z is greater than the dimension of the second housing 31 along the first direction X, and the dimension of the second housing 31 along the third direction Z is greater than the dimension of the second housing 31 along the second direction Y dimension. 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 on the first housing 11 . One of the first electrode terminal 13 and the second electrode terminal 14 is electrically connected to the positive pole piece of the first electrode assembly 12 , and the other is electrically connected to the negative pole piece 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, so as to realize charging and discharging of the first electrode assembly 12 .

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

In some embodiments, the second battery cell 30 further includes a third electrode terminal 33 and a fourth electrode terminal 34 disposed on the second casing 31 . One of the third electrode terminal 33 and the fourth electrode terminal 34 is electrically connected to the positive pole piece of the second electrode assembly 32 , and the other is electrically connected to the negative pole piece of the second electrode assembly 32 . The third electrode terminal 33 and the fourth electrode terminal 34 are used to electrically connect the second electrode assembly 32 with an external circuit, so as to realize 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 casing 31 , or may be disposed on opposite sides of the second casing 31 respectively.

In some embodiments, the first battery cells 10 are lithium-ion battery cells, and the second battery cells 30 are sodium-ion battery cells.

Compared with lithium-ion battery cells, sodium-ion battery cells have better low temperature resistance, needle penetration resistance, extrusion resistance and other safety properties. Compared with sodium-ion battery cells, lithium-ion battery cells have higher energy density.

In this 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 adopts a sodium-ion battery cell to reduce the risk of failure of the second battery cell 30 when being squeezed by the first battery cell 10 . In this embodiment, by assembling lithium-ion battery cells and sodium-ion battery cells into groups, the energy density and safety of the battery 2 can be balanced.

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 sodium-ion battery cells and lithium iron phosphate battery cells, ternary lithium battery cells have higher energy density. Compared with ternary lithium battery cells, sodium-ion battery cells or lithium iron phosphate battery cells are safer.

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

In this embodiment, the first battery cell 10 adopts a ternary lithium battery cell to ensure the energy density of the battery 2 . The second battery cell 30 adopts 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 it is pressed by the first battery cell 10 . This embodiment can balance the energy density and safety of the battery 2 .

FIG. 6 is a simplified schematic diagram of the battery 2 provided by other embodiments of the present application.

As shown in FIG. 6 , in some embodiments, the first battery cell 10 includes a first casing 11 , and the dimension of the first casing 11 along the second direction Y is L 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 along the second direction Y is D ₁ . L ₁ , D ₁ and n satisfy: L ₁ ≥(n-1)·D ₁ .

n is a positive integer greater than 1.

L ₁ is the largest dimension of the first housing 11 along the second direction Y. Exemplarily, the first housing 11 includes two second surfaces 10b oppositely arranged along the second direction Y, the second surfaces 10b are perpendicular to the second direction Y _; L1 is the distance between the two second surfaces 10b along the second direction Y. spacing.

D ₁ is the largest dimension of the second battery cell 30 along the second direction Y. Exemplarily, D ₁ is the largest dimension along the second direction Y of the second case of the second battery cell 30 . Optionally, the second battery cell 30 is a cylindrical battery cell, and D ₁ is the diameter of the cylindrical battery cell.

n·D ₁ can be used to characterize the space occupied by the battery cells 20 in the second direction Y; if the value of n·D ₁ is too large, some of the second battery cells 30 may not be able to communicate with the first battery cells 10 in the first The overlapping in the direction X results in that the second battery cells 30 cannot be supported and limited by the first battery cells 10 . In the embodiment of the present application, n·D ₁ ≤ L ₁ +D ₁ , in this way, the second battery cell 30 located at the end of the battery cell 20 along the second direction Y overlaps with the first battery cell 10 in the first direction X The size of the area along the second direction Y can be approximately guaranteed at D ₁ /2, so that each second battery cell 30 of the battery unit 20 can be effectively supported and limited by the first battery cell 10 .

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

FIG. 7 is a simplified schematic diagram of the battery 2 provided by other embodiments of the present application.

As shown in FIG. 7 , in some embodiments, the first battery cell 10 includes a first casing 11 , and the dimension of the first casing 11 along the second direction Y is L 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 along the second direction Y is D ₁ . L ₁ , D ₁ and n satisfy: n·D ₁ ≥0.5·L ₁ .

n·D ₁ can be used to characterize the space occupied by the battery unit 20 in the second direction Y; if the value of n·D ₁ is too small, the space utilization rate of the battery unit 20 in the second direction Y is low; this application implements For example, n·D ₁ ≥ 0.5·L ₁ , so that the battery unit 20 can effectively use the space in the second direction Y.

FIG. 8 is a simplified schematic diagram of a battery 2 provided by other embodiments of the present application.

As shown in FIG. 8 , in some embodiments, L ₁ , D ₁ and n satisfy: L ₁ ≦(n+1)D ₁ .

n·D ₁ can be used to characterize the space occupied by the battery cell 20 along the second direction Y. In the embodiment of the present application, n·D ₁ ≧L ₁ -D ₁ is satisfied, so that the battery unit 20 can effectively utilize the space in the second direction Y and reduce the loss of the energy density of the battery 2 .

FIG. 9 is a simplified schematic diagram of the battery 2 provided by other embodiments 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 casing 11 , and the dimension of the first casing 11 along the first direction X is L ₂ . The dimension of each second battery cell 30 along the first direction X is D ₂ , where D ₂ <2·L ₂ .

L ₂ is the largest dimension of the first housing 11 along the first direction X. Exemplarily, the first surface 10a is perpendicular to the first direction X, and L ₂ is the distance between the two first surfaces 10a along the first direction X.

D ₂ is the largest dimension of the second battery cell 30 along the first direction X. Exemplarily, D ₂ is the largest dimension along the first direction X of the second case of the second battery cell 30 . Optionally, the second battery cell 30 is a cylindrical battery cell, and D ₁ is equal to D ₂ .

D ₂ is positively related to the size of the gap G along the first direction X. If D ₂ is too large, space may be wasted, resulting in insufficient energy density of the battery 2 . In the embodiment of the present application, D ₂ <2·L ₂ is set to reduce the loss of the energy density of the battery 2 .

In some embodiments, 0.5L ₂ &lt; D ₂ &lt; 2·L ₂ .

In some embodiments, D ₂ equals L ₂ . This embodiment can simplify the arrangement of the plurality of battery cells 20 and the plurality of first battery cells 10. For example, on the premise that the total number of the first battery cells 10 and the battery cells 20 is constant, the first battery cells 10 can be changed. The number of , will not change the overall size of the battery 2 along the first direction X.

In some embodiments, the battery 2 further includes a functional part 40 , and at least part of the functional part 40 is accommodated in the gap G.

The functional component 40 may fill only a part of the gap G, or may fill the gap G completely. 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 account for the expansion of the first battery cell 10 Provide space.

The functional component 40 is a component in the battery 2 for realizing a specific function, which includes but is not limited to components such as heat exchange components, heat insulation components, buffer components, adhesive components, sensors, and wires.

The gap G in this embodiment can provide space for the functional components 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 exchange member, a thermal insulation member, a buffer member, and an adhesive member.

In some examples, a heat exchange member may be used to exchange heat with the first battery cell 10 . The heat exchange element may be provided with a flow channel for the heat exchange medium. When the heat exchange medium flows through the heat exchange element, the heat exchange medium may exchange heat with the first battery cell 10 through the heat exchange element, so that the first battery cell The body 10 operates within a suitable temperature. Optionally, the heat exchange member may be used to exchange heat with the second battery cells 30 .

In some examples, in the second direction Y, at least a portion of the heat insulating member is positioned between two adjacent second battery cells 30 to reduce heat transfer between the two second battery cells 30 . Optionally, the heat insulating member may also be used 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 position of the second battery cell 30 in the second direction Y, so as to reduce the risk of the second battery cell 30 shifting in the second direction Y. The buffer may be compressed when the first battery cell 10 is expanded to provide 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 overall strength of the battery cells 20 . Optionally, the adhesive member can also bond the second battery cell 30 to 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, battery cells 20 are disposed between at least two adjacent first battery cells 10 .

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

The number of battery cells 20 between two adjacent first battery cells 10 may be one or multiple.

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

In some embodiments, battery cells 20 are disposed between any two adjacent first battery cells 10 .

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

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

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

Each battery cell 20 can provide space for the expansion of the first battery cell 10 adjacent to it, so that the superposition of the expansion amount of the plurality of first battery cells 10 in the first direction X can be reduced, and the first battery cell can be improved. 10 cycle performance, extending the life of the battery 2.

FIG. 11 is a schematic structural diagram of a battery 2 provided by other embodiments of the present application.

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

When one side of the battery 2 along the first direction X is subjected to an external impact, the gap G of the battery unit 20 can play a role in dispersing stress, thereby reducing the risk of failure of the first battery unit 10 .

In some embodiments, the second battery cell 30 is a cylindrical battery cell. Compared with square battery cells, cylindrical battery cells have better mechanical properties and stronger anti-collision ability. In this embodiment, the cylindrical battery cells are arranged at the end of the battery 2 , which can reduce the risk of failure of the battery 2 and improve the stability of the battery 2 .

In some embodiments, the second battery cells 30 are configured as sodium-ion battery cells or lithium iron phosphate battery cells with better safety performance.

In some embodiments, both ends of the battery 2 along the first direction X are configured as battery cells 20 . The battery cells 20 can protect the first battery cells 10 from both ends to reduce the risk of failure of the first battery cells 10 .

FIG. 12 is a schematic structural diagram of a battery 2 provided by other embodiments of the present application.

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

This embodiment does not limit the order in which the plurality of battery cells 20 and the first battery cells 10 are stacked. For example, the plurality of battery cells 20 and the plurality of first battery cells 10 may be alternately arranged along the first direction X, or The plurality of battery cells 20 are arranged in series, the plurality of first battery cells 10 are arranged in series, and the battery cells 20 and the first battery cells 10 may also be arranged in other arrangements. The number of the second battery cells 30 of the plurality of battery cells 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 cells 20 first decreases and then increases.

When arranging a plurality of battery cells 20 in a row, as long as the number of the second battery cells 30 of the plurality of battery cells 20 shows a trend of decreasing first and then increasing, it is not required that the number of the second battery cells 30 of the adjacent battery cells 20 The number of battery cells 30 must be different. Exemplarily, the number of the second battery cells 30 of some adjacent battery cells 20 is the same.

The plurality of battery cells 20 and the plurality of first battery cells 10 are stacked along the first direction X, and the expansion amount of the plurality of first battery cells 10 will be superimposed toward the middle of the battery 2, that is, the closer to the middle, the first The larger the expansion force received by the battery cell 10 is. In the embodiment of the present application, the number of the second battery cells 30 of the battery cells 20 in the middle of the battery 2 is reduced, so as to provide more space for the expansion of the first battery cells 10 and reduce the expansion force on the first battery cells 10 , the performance of the first battery cell 10 is improved.

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

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

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 10c.

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 provided by other embodiments of the present application.

As shown in FIG. 13 , in some embodiments, the first battery cell 10 includes a first casing and a first electrode terminal 13 disposed on the first casing, and the first electrode terminal 13 is disposed on the first casing along the second direction Y side.

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

14 is a schematic structural diagram of the battery 2 provided by other embodiments of the application; FIG. 15 is another structural schematic diagram of the battery 2 of FIG. 14 , wherein the frame structure 60 is omitted; FIG. 16 is the battery shown in FIG. 15 at another angle Below is the schematic diagram of the structure.

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

The plurality of bus components 50 connect the plurality of first battery cells 10 and the plurality of second battery cells 30 in series, in parallel or in a mixed connection. The mixed connection refers to the plurality of first battery cells 10 and the plurality of second battery cells. 30 in both series and parallel.

In some embodiments, the battery 2 further includes a frame structure 60 for supporting and fixing the first battery cell 10 and the second battery cell 30 .

In some embodiments, the frame structure 60 includes two end plates 61 and two side plates 62, the two end plates 61 are arranged along the first direction X, and the two side plates 62 connect the two end plates 61 to form a substantially Rectangular frame structure 60 .

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

In some embodiments, the first battery cell 10 includes a first electrode terminal 13 and a second electrode terminal 14 with opposite polarities, and the second battery cell 30 includes a third electrode terminal 33 and a fourth electrode terminal with opposite polarities 34. The plurality of bus members 50 include a first bus member 51 for electrically connecting the third electrode terminals 33 of the plurality of second battery cells 30 of the battery cell 20 to the first electrode terminals 13 .

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

In some embodiments, the polarities of the third electrode terminal 33 and the first electrode terminal 13 are opposite. The first bus member 51 connects the plurality of second battery cells 30 of the battery cells 20 to the first battery cells 10 in series.

In some embodiments, the first electrode terminal 13 is located at one end of the first battery cell 10 along the third direction Z, and the third direction Z is 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 along the third direction Z. The first bus part 51 includes a first connection part 511 , a second connection part 512 and a third connection part 513 . The third electrode terminals 33 of the plurality of second battery cells 30, and the second connecting portion 512 is used to connect the first connecting portion 511 and the third connecting portion 513, and the first connecting portion 511 and the third connecting portion 513 are opposite to each other. The second connecting portion 512 is bent.

In this embodiment, the first bus member 51 with the bent structure can connect the first electrode terminal 13 and the third electrode terminal 33 on opposite sides, thereby realizing multiple first battery cells 10 and battery cells 20 Electrical connection of the second battery cell 30 .

In some embodiments, the plurality of bus components 50 further include a second bus component 52 for connecting the fourth electrode terminals 34 of the plurality of second battery cells 30 of the battery cells 20 with the second electrode terminals 14 Electrical connections.

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, and the third electrode terminal 33 is located at the same end of the second battery cell 30 along the third direction Z The fourth electrode terminal 34 is located at one end of the second battery cell 30 facing the first electrode terminal 13 along the third direction Z, from the end facing away from the first electrode terminal 13 .

Exemplarily, two first battery cells 10 are provided on both sides of the battery cell 20 along the first direction X, and the first bus part 51 connects the third electrode terminals 33 of the plurality of second battery cells 30 of the battery cell 20 with the third electrode terminals 33 . The first electrode terminals 13 of one first battery cell 10 are electrically connected, and the second bus member 52 connects the fourth electrode terminals 34 of the plurality of second battery cells 30 of the battery cell 20 with the fourth electrode terminals 34 of the other first battery cells 10 . The second electrode terminals 14 are electrically connected. At this time, the first bus member 51 and the second bus member 52 connect the battery cell 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 on the same side of the battery 2 along the third direction Z, the second bus member 52 does not need to be bent. Exemplarily, the second collecting member 52 is an L-shaped flat plate.

FIG. 17 is a schematic structural diagram of a battery 2 provided by other embodiments of the present application.

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

In some embodiments, some of the first battery cells 10 are continuously arranged along the first direction X. Among these first battery cells 10 , there is no battery cell 20 between adjacent first battery cells 10 .

Exemplarily, the plurality of bus components further include a third bus component 53 , and the third bus component 53 is used to connect the consecutively arranged first battery cells 10 in series, in parallel or in a mixed manner.

FIG. 18 is a schematic structural diagram of a battery 2 provided by other embodiments of the present application.

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

The plurality of battery columns 70 are arranged in a direction perpendicular to the first direction X. As shown in FIG. 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 cells 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 cells 20 .

FIG. 19 is a simplified schematic diagram of the battery 2 provided by other embodiments of the present application.

As shown in FIG. 19 , in some embodiments, the second battery cells 30 may be other special-shaped battery cells. For example, the second battery cell 30 is in the shape of a racetrack, in other words, the projection of the second casing of the second battery cell 30 in the third direction is in the shape of a racetrack.

FIG. 20 is a simplified schematic diagram of a battery 2 provided by other embodiments of the present application.

As shown in FIG. 20 , in some embodiments, the second battery cell 30 can also be a prismatic battery 2 . At least two adjacent second battery cells 30 are arranged at intervals to form a gap G.

According to some embodiments of the present application, the present application further provides an electrical device, including the battery of any of the above embodiments, and the battery is used to provide electrical energy for the electrical device. The powered device may be any of the aforementioned devices or systems using batteries.

According to some embodiments of the present application, referring to FIGS. 9 and 10 , the present application provides a battery 2 , which includes a plurality of first battery cells 10 and a plurality of battery cells 20 , and a plurality of battery cells 20 and a plurality of first battery cells 20 . A battery cell 10 is alternately stacked along the first direction X. The battery cell 20 includes a plurality of second battery cells 30 arranged along a second direction Y, which is perpendicular to the first direction X. As shown in FIG. The first battery cells 10 are square battery cells, and the second battery cells 30 are cylindrical battery cells.

In the first direction X, each second battery cell 30 at least partially overlaps with 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 cells 20 .

A heat exchange element is arranged in the gap G.

The first battery cell 10 includes a first casing 11 , and the dimension of the first casing 11 along the second direction Y is L 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 satisfy: (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 in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (26)

1. a battery, is characterized in that, comprises: a plurality of first battery cells; and a battery unit stacked with a plurality of the first battery cells along a first direction, the battery unit including a plurality of second battery cells arranged along a second direction, the second direction being perpendicular to the first direction , the first battery cell and the second battery cell have different shapes; In the first direction, each of the second battery cells at least partially overlaps the first battery cell; in the second direction, at least two adjacent ones of the battery cells A gap is provided between the second battery cells. 2 . The battery according to claim 1 , wherein the first battery cell has two first surfaces opposite to each other along the first direction, and the first surfaces are flat; 2 . At least part of the outer surface of the second battery cell is an arc-shaped surface, and the arc-shaped surface is used for connecting with the first surface; In the second direction, the gap is formed between the arc 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 . 4 . The battery according to claim 1 , wherein, in the battery cells, the gap is provided between any two adjacent second battery cells. 5 . 5. The battery according to any one of claims 1-4, characterized in that, The first battery cell includes a first casing, and the dimension of the first casing along the second direction is L ₁ ; The number of the second battery cells of the battery unit is n, the size of each second battery cell along the second direction is D ₁ , and L ₁ , D ₁ and n satisfy: L ₁ ≥(n-1)·D ₁ . 6. The battery according to any one of claims 1-4, characterized in that, The first battery cell includes a first casing, and the dimension of the first casing along the second direction is L ₁ ; The number of the second battery cells of the battery unit is n, the size of each second battery cell along the second direction is D ₁ , and L ₁ , D ₁ and n satisfy: n·D ₁ ≥0.5·L ₁ . 7 . The battery according to claim 6 , wherein L ₁ , D ₁ and n satisfy: L ₁ ≤(n+1) D ₁ . 8 . 8. The battery according to any one of claims 1-4, characterized in that, The first battery cell includes a first casing, and the dimension of the first casing along the first direction is L ₂ ; The dimension of each of the second battery cells along the first direction is D ₂ , where D ₂ <2·L ₂ . 9 . The battery according to claim 1 , further comprising a functional component, at least part of which is accommodated in the void. 10 . 10 . The battery according to claim 9 , wherein the functional component comprises at least one of a heat exchange member, a heat insulation member, a buffer member and an adhesive member. 11 . 11 . The battery according to claim 1 , wherein the battery unit is provided between at least two adjacent first battery units. 12 . 12 . The battery according to claim 11 , wherein the battery unit is provided between any two adjacent first battery units. 13 . 13 . The battery according to claim 12 , wherein a plurality of the battery cells are provided, and the plurality of the battery cells and the plurality of the first battery cells are alternately arranged along the first direction. 14 . 14 . The battery according to claim 1 , wherein at least one end of the battery along the first direction is set as the battery unit. 15 . 15 . The battery according to claim 14 , wherein both ends of the battery along the first direction are set as the battery cells. 16 . 16. The battery according to any one of claims 1-4, characterized in that, the battery cells are provided in a plurality, and a plurality of the battery cells and a plurality of the first battery cells are arranged along the first direction stacking. 17 . The battery according to claim 16 , wherein, in the first direction, the number of the second battery cells of the plurality of battery cells first decreases and then increases. 18 . 18. The battery according to any one of claims 1-4, wherein the first battery cell comprises a first casing and a first electrode terminal disposed on the first casing, the first electrode The terminal is arranged on one side of the first housing along the second direction. 19. The battery according to any one of claims 1-4, wherein the first battery cell comprises a first casing and a first electrode terminal disposed on the first casing, the first electrode The terminal is disposed on one side of the first housing along a third direction, and the third direction is perpendicular to the first direction and the second direction. 20. The battery according to any one of claims 1-4, characterized in that it further comprises a plurality of bus parts for connecting a plurality of the first battery cells and the battery cells A plurality of the second battery cells are electrically connected. 21. The battery of claim 20, wherein The first battery cell includes a first electrode terminal and a second electrode terminal with opposite polarities, and the second battery cell includes a third electrode terminal and a fourth electrode terminal with 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 cell to the first electrode terminals. 22. The battery of claim 21, wherein the polarity of the third electrode terminal and the first electrode terminal are opposite. 23. The battery according to claim 21, wherein the first electrode terminal is located at one end of the first battery cell along a third direction, and the third direction is perpendicular to the first direction and the third direction. the second direction; the third electrode terminal is located at one end of the second battery cell away from the first electrode terminal along the third direction; The first bus component includes a first connection part, a second connection part and a third connection part, the first connection part is used for connecting the first electrode terminal, and the third connection part is used for connecting the battery the third electrode terminals of the plurality of the second battery cells of the unit, the second connection part is used to connect the first connection part and the third connection part, and the first connection part and the The third connecting portions are all bent relative to the second connecting portions. 24. The battery according to any one of claims 1-4, wherein the first battery cell is a lithium-ion battery cell, and the second battery cell is a sodium-ion battery cell. 25. The battery according to any one of claims 1-4, wherein the first battery cell is a ternary lithium battery cell, and the second battery cell is a sodium-ion battery cell or phosphoric acid Lithium-iron battery cell. 26. An electrical device, characterized by comprising the battery according to any one of claims 1-25, which is used to provide electrical energy.

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