Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. A housing having a first wall; the first electrode assembly is arranged on the first wall; the first electrode assembly comprises a first electrode terminal and an adapter, the adapter comprises a first connecting part and a second connecting part which are located on the same side of the first wall and connected with each other, the first electrode terminal is connected with the first connecting part, and the first electrode terminal and the first connecting part are made of the same material and are different from each other in material; the second electrode assembly and the first electrode assembly are arranged at intervals in the length direction of the first wall; the first connecting part and the second connecting part are arranged in the width direction of the first wall. Therefore, the occupied space of the first wall in the length direction is reduced, so that the space between the first electrode assembly and the second electrode assembly is enlarged, and the arrangement and installation of other structures outside the battery monomer are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] At present, a battery includes a plurality of battery monomers, and the plurality of battery monomers are electrically connected through connecting pieces. The material of the negative electrode terminal of the battery monomer is usually copper, and the material of the positive electrode terminal of the battery monomer is usually aluminum. In order to realize that the connecting piece of a single metal material can be well welded with the positive electrode terminal and the negative electrode terminal at the same time, copper-aluminum conversion needs to be performed on the positive electrode terminal or the negative electrode terminal.

[0004] Taking the negative electrode terminal as an example, the negative electrode terminal is made of copper material, a copper layer needs to be connected above the negative electrode terminal, and then an aluminum layer connected with the copper layer is connected with an aluminum connecting piece. However, the arrangement mode of the copper layer and the aluminum layer in the related technology limits the arrangement of other components outside the battery monomer, which affects the performance of the battery. CONTENT OF THE UTILITY MODEL

[0005] In view of the problem, the present application provides a battery monomer, a battery and a power utilization device, which can alleviate the problem that the arrangement mode of the copper layer and the aluminum layer in the related technology limits the arrangement of other components outside the battery monomer, which affects the performance of the battery.

[0006] In a first aspect, the present application provides a battery monomer, comprising:

[0007] a shell having a first wall;

[0008] a first electrode assembly arranged on the first wall; the first electrode assembly includes a first electrode terminal and an adapter, the adapter includes a first connecting part and a second connecting part which are located on the same side of the first wall and are connected with each other, the first electrode terminal is connected with the first connecting part, the material of the first electrode terminal is the same as that of the first connecting part, and the material of the first electrode terminal is different from that of the second connecting part; and

[0009] a second electrode assembly arranged spaced apart from the first electrode assembly along the length direction of the first wall;

[0010] wherein the first connecting part and the second connecting part are arranged along the width direction of the first wall.

[0011] The battery cell can arrange the first connecting part and the second connecting part along the width direction of the first wall by using the space in the width direction of the first wall, reduce the occupied space in the length direction of the first wall, and increase the distance between the first electrode assembly and the second electrode assembly in the length direction of the first wall, i.e., increase the space between the first electrode assembly and the second electrode assembly, thereby facilitating the arrangement and installation of other structures outside the battery cell.

[0012] In some embodiments, the length direction of the adapter is parallel to the width direction of the first wall.

[0013] In this way, the adapter can fully utilize the space in the width direction of the first wall, and the size in the length direction of the first wall is correspondingly reduced, thereby further reducing the occupied space of the adapter in the length direction of the first wall.

[0014] In some embodiments, along the width direction of the first wall, the second connecting part is located on one side of the first connecting part, and the size of the second connecting part is greater than that of the first connecting part.

[0015] By arranging the second connecting part on only one side of the first connecting part, the space in the width direction of the first wall can be fully utilized, and the size of the second connecting part in the width direction of the first wall can be increased, thereby increasing the contact area between the second connecting part and the bus bar and further increasing the overcurrent area and improving the electrical connection reliability.

[0016] In some embodiments, the second connecting part includes two sub-connecting parts, and along the width direction of the first wall, the two sub-connecting parts are respectively located on both sides of the first connecting part.

[0017] In this way, the sub-connecting part on any one side of the first connecting part can be connected to the bus bar, and the size of the bus bar can be consistent when the battery cells are connected in groups, thereby simplifying the structure of the bus bar.

[0018] In some embodiments, along the width direction of the first wall, the two sub-connecting parts are symmetrically arranged relative to the first connecting part.

[0019] In this way, when a plurality of battery cells are connected in groups by a plurality of bus bars, since each sub-connecting part is symmetrically arranged relative to the first connecting part, the areas of the sub-connecting parts connected to different bus bars are the same, thereby improving the electrical connection reliability and simplifying the structure of the bus bar.

[0020] In some embodiments, along the width direction of the first wall, the size of the second connecting part is L1, and the size of the first wall is L; wherein 0.4L≤L1≤0.8L.

[0021] By setting 0.4L≤L1≤0.8L, the second connecting part can be connected to the busbar with a larger connecting area while using the size in the width direction of the first wall, that is, the overcurrent area is increased, and the electrical connection is more reliable.

[0022] In some embodiments, the second electrode assembly includes a second electrode terminal and a second connecting piece, the second connecting piece is located on the same side of the first wall as the adapter, the second electrode terminal is connected to the second connecting piece, and the second electrode terminal and the second connecting piece are made of the same material.

[0023] The length direction of the second connecting piece is parallel to the width direction of the first wall.

[0024] Since the first electrode terminal needs to be converted from copper to aluminum, the second electrode terminal does not need to be converted from copper to aluminum, so by setting the second electrode terminal and the second connecting piece to be made of the same material, the second connecting piece can be reliably electrically connected to the external busbar.

[0025] In some embodiments, the second connecting part has a welding mark area welded with an external connecting piece, and the shape of the welding mark area is one of rectangular, circular, or elliptical.

[0026] The welding mark area refers to the mark formed by welding, which can also be considered as the joint area of the two parts combined together. By setting the shape of the welding mark area to be one of rectangular, circular, or elliptical, the welding area can be larger and the welding can be more reliable.

[0027] The second aspect also provides a battery including a busbar and at least two battery monomers of any of the above embodiments stacked in a first direction, the first direction being parallel to the width direction of the top cover sheet.

[0028] The material of the busbar is the same as that of the second connecting part, and the busbar is used to connect the second connecting part of one of the battery monomers.

[0029] The above battery can arrange the first connecting part and the second connecting part in the width direction of the first wall using the space in the width direction of the first wall of each battery monomer, thereby reducing the occupied space in the length direction of the first wall, increasing the distance between the first electrode assembly and the second electrode assembly in the length direction of the first wall, that is, increasing the space between the first electrode assembly and the second electrode assembly, which is beneficial to the arrangement and installation of other structures outside the battery monomer.

[0030] In some embodiments, when the second connecting part includes two sub-connecting parts, the busbar is used to connect one of the sub-connecting parts of the battery monomer; or the busbar is used to simultaneously connect the two sub-connecting parts of the battery monomer.

[0031] When the bus bar is used to connect one of the sub-connection parts in the battery monomer, the structure of the bus bar can be simplified, and when the bus bar is used to connect two sub-connection parts of the battery monomer, the connection area can be increased, and the overcurrent area is also increased.

[0032] In some embodiments, the battery further comprises a flexible circuit board, at least part of the flexible circuit board is accommodated between the first electrode assembly and the second electrode assembly of at least one battery monomer; and / or

[0033] The battery further comprises a pressing member, the pressing member is arranged on at least one side of the first electrode assembly or the second electrode assembly which faces away from each other; and / or

[0034] The battery further comprises a cooling member, the cooling member is arranged on at least one side of the first electrode assembly or the second electrode assembly which faces away from each other.

[0035] Since the space between the first electrode assembly and the second electrode assembly is increased, the flexible circuit board can be placed between the first electrode assembly and the second electrode assembly, so as to facilitate the arrangement of the flexible circuit board. By arranging the first connection part and the second connection part in the width direction, the occupied space in the length direction of the first wall is reduced, not only the space between the first electrode assembly and the second electrode assembly of the battery monomer is increased, but also the space on the side of the first electrode assembly or the second electrode assembly which faces away from each other is increased. Therefore, by arranging the pressing member on at least one side of the first electrode assembly or the second electrode assembly which faces away from each other, the arrangement of the pressing member is facilitated, and the pressing area of the pressing member is increased, and the pressing reliability is improved. In addition, by arranging the cooling member on at least one side of the first electrode assembly or the second electrode assembly which faces away from each other, the arrangement of the cooling member is also facilitated.

[0036] The third aspect further provides a power consumption device comprising the battery in any of the above embodiments.

[0037] The power consumption device can utilize the space in the width direction of the first wall of each battery monomer to arrange the first connection part and the second connection part in the width direction, reduce the occupied space in the length direction of the first wall, and increase the space between the first electrode assembly and the second electrode assembly in the length direction of the first wall, so as to facilitate the arrangement and installation of other structures distributed outside the battery monomer.

[0038] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0039] Various other advantages and benefits will become clear to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings provided herein are for illustrative purposes only and, therefore, should not be considered to be limiting in any way. Like reference characters in the drawings indicate like elements throughout the various figures. In the drawings:

[0040] Figure 1 A structural schematic of a battery according to one or more embodiments.

[0041] Figure 2 A structural schematic of a battery according to one or more embodiments.

[0042] Figure 3 A structural schematic of a battery cell according to one or more embodiments.

[0043] Figure 4 A structural schematic of a battery cell according to one or more embodiments. Figure 3 A top view of the battery cell shown.

[0044] Figure 5 A structural schematic of a battery cell according to another or more embodiments.

[0045] Figure 6 A top view of the battery cell shown. Figure 5 A top view of the battery cell shown.

[0046] Figure 7 An enlarged view of a portion A of the battery cell shown. Figure 5 An enlarged view of a portion A of the battery cell shown.

[0047] Figure 8 A structural schematic of a connection structure of a plurality of battery cells in a battery according to one or more embodiments.

[0048] Figure 9 A structural schematic of a connection structure of a plurality of battery cells in a battery according to another or more embodiments.

[0049] Figure 10 A structural schematic of a partial structure of a battery according to one or more embodiments.

[0050] Reference characters in the detailed description of the specific embodiments are as follows:

[0051] Battery 100, box 10, first part 11, second part 12, battery cell 20, end cover 21, shell 22, cell assembly 23, housing 24, first wall 241, first electrode assembly 25, first electrode terminal 251, adapter 252, first connecting part 2521, second connecting part 2522, sub connecting part 2522a, first connecting piece 2523, groove 2523a, second electrode assembly 26, second electrode terminal 261, second connecting piece 262, busbar 30, flexible circuit board 40, pressing piece 50. DETAILED DESCRIPTION

[0052] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0053] Unless otherwise defined, 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 terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0055] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, 1 and / or 2, which can represent the three cases of 1 alone, 1 and 2 together, and 2 alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0057] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] When the battery monomers are grouped, the busbars are used to connect the positive and negative terminals of the battery monomers, and the busbars are laser welded with the positive and negative terminals to improve the conductivity and the reliability of the connection. At present, the material of the negative terminal of the battery monomer is usually copper, and the material of the positive terminal of the battery monomer is usually aluminum. In order to realize laser welding and ensure the welding strength, the busbar welded with the negative terminal requires copper material, and the busbar welded with the positive terminal requires aluminum material. However, for a single material busbar, it cannot be well welded with positive and negative terminals of two different materials at the same time, so in order to realize that a single metal material busbar can be well welded with positive and negative terminals at the same time, copper-aluminum conversion needs to be performed on the positive terminal or the negative terminal.

[0061] In the related art, the copper-aluminum conversion structure includes a connecting plate and a conductive plate, the conductive plate connects the positive or negative terminal with the connecting plate, and the conductive plate and the connecting plate are arranged along the length direction of the battery. In addition, in order to improve the connection reliability of the connecting plate and the busbar, the size of the connecting plate in the length direction of the battery monomer is also large.

[0062] Therefore, the copper-aluminum conversion structure occupies the space in the length direction of the battery monomer, so that the distance between the positive electrode terminal and the negative electrode terminal in the length direction of the battery monomer is reduced, that is, the space between the positive electrode terminal and the negative electrode terminal is reduced, which affects the arrangement and installation of other structures distributed outside the battery monomer, such as a circuit board, a constraint component, a water cooling component, and the like.

[0063] In order to alleviate the problem that the copper-aluminum conversion structure occupies the space in the length direction of the battery monomer and affects the arrangement and installation of other structures distributed outside the battery monomer, an embodiment of the present application designs a battery monomer. The battery monomer comprises a shell, a first electrode assembly, and a second electrode assembly, the first electrode assembly is arranged on the first wall; the first electrode assembly comprises a first electrode terminal and a conversion piece, the conversion piece comprises a first connecting portion and a second connecting portion which are located on the same side of the first wall and are connected to each other, the first electrode terminal is connected to the first connecting portion, the material of the first electrode terminal is the same as that of the first connecting portion, and the material of the first electrode terminal is different from that of the second connecting portion, the second electrode assembly is arranged in the length direction of the first wall and is spaced apart from the second electrode assembly, wherein the first connecting portion and the second connecting portion are arranged in the width direction of the first wall.

[0064] Therefore, the first connecting portion and the second connecting portion can be arranged in the width direction by using the space in the width direction of the first wall, the occupied space in the length direction of the first wall is reduced, so that the distance between the first electrode assembly and the second electrode assembly in the length direction of the first wall is increased, that is, the space between the first electrode assembly and the second electrode assembly is increased, which is beneficial to the arrangement and installation of other structures distributed outside the battery monomer.

[0065] The battery monomer of the present application is applied to a battery, so as to solve the problem that the copper-aluminum conversion structure occupies the space in the length direction of the battery monomer and affects the arrangement and installation of other structures distributed outside the battery monomer.

[0066] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft.

[0067] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0068] In order to facilitate the description, the following embodiments take a vehicle 1000 as an example to illustrate a kind of electric device of an embodiment of the present application.

[0069] Please refer to Figure 1, Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0070] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0071] Please refer to Figure 2 , Figure 2 An exploded view of the battery 100 is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a containing space for containing the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate structure, the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the containing space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be various shapes, such as a cylinder, a cuboid, etc.

[0072] In the battery 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be in a form that the multiple battery cells 20 are connected in series, in parallel, or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the case 10. The battery 100 can also include other structures. For example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0073] Each battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in a shape of a cylinder, a flat body, a cuboid, or other shapes.

[0074] Please refer to Figure 3 , Figure 3 The battery cell 20 provided in some embodiments of the present application is shown in a structural schematic diagram. The battery cell 20 refers to the smallest unit that constitutes a battery. As shown in Figure 3 , the battery cell 20 includes an end cover 21, a shell 22, a cell assembly, and other functional components.

[0075] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easy to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as electrode terminals. The electrode terminal 211 can be used for electrical connection with the cell assembly for output or input of the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0076] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0077] A cell assembly is the component within a single battery cell 20 where an electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. A cell assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the battery output terminal connector to form a positive electrode sheet, and negative electrode material is coated onto the battery output terminal connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and a separator is disposed between the positive and negative electrode sheets, thus forming the cell assembly. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 211 to form a current loop.

[0078] Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments. Figure 4 for Figure 3 The image shows a top view of a single battery cell. Referring to the accompanying drawings, an embodiment of this application provides a battery cell 20, including a housing 24, a first electrode assembly 25, and a second electrode assembly 26.

[0079] The shell 24 has a first wall 241, and the first electrode assembly 25 is arranged on the first wall 241. The first electrode assembly 25 includes a first electrode terminal 251 and an adapter 252. The adapter 252 includes a first connecting portion 2521 and a second connecting portion 2522, which are arranged on the same side of the first wall 241 and are connected to each other. The first electrode terminal 251 is connected to the first connecting portion 2521. Specifically, the first electrode terminal 251 and the first connecting portion 2521 are made of the same material, and the first electrode terminal 251 and the second connecting portion 2522 are made of different materials. The second electrode assembly 26 is arranged at a position spaced apart from the first electrode assembly 25 along the length direction of the first wall 241. The first connecting portion 2521 and the second connecting portion 2522 are arranged along the width direction of the first wall 241.

[0080] The length direction of the first wall 241 is the left-right direction as shown in FIG. 1, the width direction of the first wall 241 is the up-down direction as shown in FIG. 1, and the thickness direction of the first wall 241 is the direction perpendicular to the paper surface as shown in FIG. 1. Figure 4 Figure 4 Figure 4 It should be noted that the length direction, the width direction and the thickness direction of the first wall 241 can correspond to the length direction, the width direction and the height direction of the battery monomer 20, respectively.

[0081] The first wall 241 is a part of the end cover 21, and the shape and size of the first wall 241 can be set according to the shape and size of the opening on the shell 22 in the battery monomer 20. For example, the first wall 241 can be set as a long strip-shaped structure.

[0082] For example, the first wall 241 can be made of a metal material such as an aluminum alloy, a magnesium alloy and stainless steel, or a plastic material such as polypropylene, polycarbonate and polystyrene.

[0083] The first electrode assembly 25 and the second electrode assembly 26 are respectively used for electrically connecting one of the positive and negative electrodes of the battery 100, that is, the first electrode assembly 25 can be used for electrically connecting the positive electrode or the negative electrode of the battery 100. Hereinafter, the first electrode assembly 25 is used for electrically connecting the negative electrode, and the second electrode assembly 26 is used for electrically connecting the positive electrode.

[0084] The adapter 252 is a component capable of conversion connection. In the embodiment of the present application, the adapter 252 is a component for converting the connection of the first electrode terminal 251 to an external bus bar.

[0085] ​​In addition, the same material in the present application refers to the same metal matrix, the metal matrix refers to the main component metal of the alloy, for example, pure aluminum and aluminum alloy have the same metal matrix aluminum, the aluminum alloy can be aluminum manganese alloy, aluminum silicon alloy, aluminum magnesium alloy, as long as the matrix metal of them is aluminum. Generally, the positive terminal of the battery monomer 20, that is, the second electrode terminal 261 of the second electrode assembly 26 in the embodiment of the present application adopts aluminum as the matrix metal, and the negative terminal, that is, the first electrode terminal 251 of the first electrode assembly 25 in the embodiment of the present application adopts copper as the metal matrix. Taking the busbar with aluminum as the metal matrix as an example, the first electrode terminal 251 and the first connecting part 2521 in the embodiment of the present application both adopt copper as the metal matrix, therefore, the negative terminal needs to be connected with copper and aluminum, that is, the second connecting part 2522 adopts aluminum as the metal matrix, and the second electrode assembly 26 adopts aluminum as the metal matrix, therefore, the positive terminal does not need to be connected with copper and aluminum.

[0086] The battery monomer 20 in the embodiment of the present application can arrange the first connecting part 2521 and the second connecting part 2522 along the width direction of the first wall 241 by using the space in the width direction of the first wall 241, reduces the occupied space in the length direction of the first wall 241, makes the distance between the first electrode assembly 25 and the second electrode assembly 26 in the length direction of the first wall 241 larger, that is, the space between the first electrode assembly 25 and the second electrode assembly 26 is larger, and is beneficial to the arrangement and installation of other structures distributed outside the battery monomer 20.

[0087] Continuing to refer to Figure 3 and Figure 4 According to some embodiments of the present application, the length direction of the adapter 252 is parallel to the width direction of the first wall 241.

[0088] In this way, the adapter 252 can fully utilize the space in the width direction of the first wall 241, and the size in the length direction of the first wall 241 is reduced accordingly, so that the occupied space of the adapter 252 in the length direction of the first wall 241 is further reduced.

[0089] According to some embodiments of the present application, along the width direction of the first wall 241, the second connecting part 2522 is located on one side of the first connecting part 2521, and the size of the second connecting part 2522 is greater than the size of the first connecting part 2521.

[0090] By arranging the second connecting part 2522 only on one side of the first connecting part 2521, the space in the width direction of the first wall 241 can be fully utilized, and at the same time, the size of the second connecting part 2522 in the width direction of the first wall 241 can be increased, so that the contact area between the second connecting part 2522 and the busbar is increased, and the overcurrent area is further increased, and the electrical connection reliability is improved.

[0091] Referring to Figure 5 、 Figure 6 and Figure 7 In some embodiments, the second connecting portion 2522 includes two sub connecting portions 2522a, which are respectively located on two sides of the first connecting portion 2521 along the width direction of the first wall 241.

[0092] In this way, the first connecting portion 2521 can be connected to the bus bar through any one of the two sub connecting portions 2522a, and the size of the bus bar can be consistent when the battery cells 20 are connected in groups, thereby simplifying the structure of the bus bar.

[0093] Specifically, the two sub connecting portions 2522a are symmetrically arranged with respect to the first connecting portion 2521 along the width direction of the first wall 241.

[0094] In this way, when the plurality of battery cells 20 are connected in groups through the plurality of bus bars, since each sub connecting portion 2522a is symmetrically arranged with respect to the first connecting portion 2521, the area of each sub connecting portion 2522a connected to the different bus bar is the same, thereby not only improving the electrical connection reliability, but also simplifying the structure of the bus bar.

[0095] According to some embodiments of the present application, the size of the second connecting portion 2522 along the width direction of the first wall 241 is L1, and the size of the first wall 241 is L; wherein 0.4L≤L1≤0.8L.

[0096] By setting 0.4L≤L1≤0.8L, the second connecting portion 2522 can have a larger connecting area connected to the bus bar while utilizing the size along the width direction of the first wall 241, that is, the overcurrent area is increased, and the electrical connection is more reliable.

[0097] Alternatively, L1 is equal to 0.4L, 0.5L, 0.6L, 0.7L or 0.8L.

[0098] It should be noted that when the second connecting portion 2522 includes two sub connecting portions 2522a, L1 is the sum of the sizes of the two sub connecting portions 2522a along the width direction of the first wall 241.

[0099] According to some embodiments of the present application, the adapter 252 includes a first connecting piece 2523, the first connecting piece 2523 includes the second connecting portion 2522, the first connecting piece 2523 is further formed with a groove 2523a, the second connecting portion 2522 is located at least one side of the groove 2523a along the width direction of the first wall 241, and the first connecting portion 2521 is embedded in the groove 2523a. Wherein, the material of the first connecting piece 2523 is the same as the material of the second connecting portion 2522.

[0100] By embedding the first connecting portion 2521 into the groove 2523a, the connection between the first connecting portion 2521 and the first connecting member 2523 can be made more secure.

[0101] In the above embodiment, the groove 2523a does not penetrate the first connecting member 2523 along the height direction of the first wall 241, and the first electrode terminal 251 can be connected to the first connecting portion 2521 by sequentially passing through the first wall 241, the bottom of the groove 2523a of the first connecting member 2523, and the first connecting portion 2521. Alternatively, the groove 2523a can be replaced by a through hole that penetrates the first connecting member 2523 along the height direction of the first wall 241.

[0102] Alternatively, the groove 2523a can also penetrate the first connecting member 2523 along the length direction of the first wall 241. In this way, the groove 2523a is easier to form, and the first connecting portion 2521 can be integrally formed on the first connecting member 2523, and then the first connecting member 2523 can be cut, which can improve the efficiency of processing and manufacturing, and also make the bonding force between the first connecting portion 2521 and the first connecting member 2523 better. It should be noted that in the above embodiment, the first connecting portion 2521 can be used as a separate component.

[0103] Further, the first connecting portion 2521 and the first connecting member 2523 form a composite surface at the groove 2523a to make them better combined and thus better electrically transmitted.

[0104] Since the first connecting portion 2521 and the first connecting member 2523 are made of different materials, the composite surface after combining them is a metallurgical bond (i.e., a bond formed by the mutual diffusion of atoms between the interfaces of two metals), which makes the bonding surface of the two stable and does not cause relative sliding and contact resistance fluctuations due to external vibration or impact.

[0105] Specifically, the composite surface can be formed by welding, cold rolling, hot rolling, explosive bonding, or explosive rolling of the first connecting portion 2521 and the first connecting member 2523.

[0106] Continuing to refer to Figure 3 and Figure 4 In some embodiments, the first connecting portion 2521 and the first connecting member 2523 can both be plate-shaped structures, which on the one hand reduces the thickness of the entire first wall 241, and on the other hand also increases the connection area between the first connecting member 2523 and the first connecting portion 2521, and between the first connecting member 2523 and the bus bar, thereby improving the reliability of electrical connection.

[0107] According to some embodiments of the present application, the second connecting portion 2522 has a welding mark area welded with the external connecting sheet, and the welding mark area has one of a rectangular shape, a circular shape, or an elliptical shape.

[0108] The welding mark area refers to a mark formed by welding, and can also be considered as a joint area where two parts are combined together. By setting the welding mark area to have one of a rectangular shape, a circular shape, or an elliptical shape, a larger welding area can be obtained, and the welding can be more reliable.

[0109] According to some embodiments of the present application, the second electrode assembly 26 includes a second electrode terminal 261 and a second connecting piece 262, the second connecting piece 262 is located on the same side of the first wall 241 as the adapter 252, the second electrode terminal 261 is connected to the second connecting piece 262, and the second electrode terminal 261 and the second connecting piece 262 are made of the same material; wherein the length direction of the second connecting piece 262 is parallel to the width direction of the first wall 241.

[0110] It can be understood that the second connecting piece 262 can be electrically connected to the external bus bar. When the second electrode terminal 261 is connected to the external bus bar, no conversion is required, and the second electrode terminal 261 can be directly connected to the bus bar through the second connecting piece 262.

[0111] In the embodiments of the present application, the copper-aluminum conversion is required for the first electrode terminal 251. Therefore, the second electrode terminal 261 does not need to be subjected to copper-aluminum conversion, and thus by setting the second electrode terminal 261 and the second connecting piece 262 to be made of the same material, the second connecting piece 262 can be reliably electrically connected to the external bus bar. Specifically, the second electrode terminal 261 and the second connecting piece 262 can be made of aluminum as a metal base.

[0112] In addition, since the length direction of the second connecting piece 262 is parallel to the width direction of the first wall 241, the second connecting piece 262 can also utilize the space in the width direction of the first wall 241, thereby reducing the occupied space in the length direction of the first wall 241, and further increasing the spacing between the first electrode assembly 25 and the second electrode assembly 26 in the length direction of the first wall 241, i.e., increasing the space between the first electrode assembly 25 and the second electrode assembly 26, which is beneficial to the arrangement and installation of other structures distributed outside the battery monomer 20.

[0113] Specifically, in the width direction of the first wall 241, the length of the second connecting piece 262 is the same as the length of the adapter 252.

[0114] According to some embodiments of the present application, the battery cell 20 further comprises a first upper insulating member, a first lower insulating member and a first sealing member. The first upper insulating member is located between the first connecting member 2523 and the upper surface of the first wall 241, and the first sealing member and the first lower insulating member are located between the lower surface of the first wall 241 and the first electrode terminal 251. The first electrode terminal 251 is connected to the first connecting portion 2521 by sequentially passing through the first sealing member, the first wall 241, the first upper insulating member and the first connecting member 2523 from bottom to top.

[0115] The battery cell 20 further comprises a second upper insulating member, a second lower insulating member and a second sealing member. The second upper insulating member is located between the second connecting member 262 and the upper surface of the first wall 241, and the second sealing member and the second lower insulating member are located between the lower surface of the first wall 241 and the second electrode terminal 261. The second electrode terminal 261 is connected to the second connecting member 262 by sequentially passing through the second sealing member, the first wall 241 and the second upper insulating member from bottom to top.

[0116] The arrangement of the above-mentioned insulating members and sealing members can insulate the first electrode assembly 25 and the second electrode assembly 26 from each other.

[0117] According to some embodiments of the present application, the present application further provides a battery 100 comprising a busbar 30 and at least two battery cells 20 of any of the above-mentioned embodiments stacked in a first direction, wherein the first direction is parallel to the width direction of the first wall 241. The material of the busbar 30 is the same as that of the second connecting portion 2522, and the busbar 30 is used to connect the second connecting portion 2522 of one of the battery cells 20.

[0118] The battery 100 provided by the embodiments of the present application can arrange the first connecting portion 2521 and the second connecting portion 2522 in the width direction of the first wall 241 by using the space in the width direction of the first wall 241 of each battery cell 20, thereby reducing the occupied space in the length direction of the first wall 241, increasing the spacing between the first electrode assembly 25 and the second electrode assembly 26 in the length direction of the first wall 241, i.e. increasing the space between the first electrode assembly 25 and the second electrode assembly 26, and thus facilitating the arrangement and installation of other structures distributed outside the battery cell 20.

[0119] Specifically, referring to FIG. 1, the busbar 30 is used to connect the second connecting portion 2522 of one of the battery cells 20. Figure 8 and 9 When the second connecting portion 2522 comprises two sub-connecting portions 2522a, the busbar 30 is used to connect one of the sub-connecting portions 2522a of the battery cell 20, or the busbar 30 is used to simultaneously connect the two sub-connecting portions 2522a of the battery cell 20.

[0120] When the busbar 30 is used to connect one of the sub-connection portions 2522a in the battery monomer 20, the structure of the busbar 30 can be simplified, and when the busbar 30 is used to connect two sub-connection portions 2522a of the battery monomer 20 at the same time, the connection area can be increased, and the overcurrent area can be increased.

[0121] According to some embodiments of the present application, the busbar 30 extends in the first direction and is used to connect the second connection portion 2522 of one battery monomer 20 and the second electrode assembly 26 of an adjacent battery monomer.

[0122] Referring to Figure 1 and Figure 10 According to some embodiments of the present application, the battery 100 further comprises a flexible circuit board 40, and at least part of the flexible circuit board 40 is accommodated between the first electrode assembly 25 and the second electrode assembly 26 of at least one battery monomer 20.

[0123] The flexible circuit board 40, which is abbreviated as FPC, can be connected with the electrode terminals of the battery monomer 20, and can collect voltage, temperature and other data of each battery monomer 20.

[0124] Since the space between the first electrode assembly 25 and the second electrode assembly 26 is increased, the flexible circuit board 40 can be placed between the first electrode assembly 25 and the second electrode assembly 26, and thus the arrangement of the flexible circuit board 40 is facilitated.

[0125] Referring to Figure 1 and Figure 10 According to some embodiments of the present application, the battery 100 further comprises a pressing member 50, and the pressing member 50 is arranged on at least one side of the first electrode assembly 25 or the second electrode assembly 26 which faces away from each other.

[0126] The pressing member 50 refers to a component capable of pressing the battery monomer 20. The pressing member 50 can be a pressing strip, which can fix the battery monomer 20.

[0127] By arranging the first connection portion 2521 and the second connection portion 2522 in the width direction, the length of the first wall 241 is reduced, which not only increases the space between the first electrode assembly 25 and the second electrode assembly 26 of the battery monomer 20, but also increases the space on the side of the first electrode assembly 25 or the second electrode assembly 26 of the battery monomer 20 which faces away from each other. Therefore, by arranging the pressing member 50 on at least one side of the first electrode assembly 25 or the second electrode assembly 26 which faces away from each other, the arrangement of the pressing member 50 is facilitated, and the pressing area of the pressing member 50 can be increased, and the pressing reliability is improved.

[0128] According to some embodiments of the present application, the battery 100 further comprises a cooling member arranged on at least one side of the first electrode assembly 25 or the second electrode assembly 26 facing away from each other.

[0129] The cooling member refers to a component capable of cooling the battery monomer 20. The cooling member can be a cooling plate. By arranging a flow channel of a cooling fluid in the cooling plate, the cooling fluid can take away the heat emitted by the battery monomer 20.

[0130] As described above, by arranging the first connecting portion 2521 and the second connecting portion 2522 in the width direction, the length direction space occupied by the first wall 241 is reduced, which not only increases the space between the first electrode assembly 25 and the second electrode assembly 26 of the battery monomer 20, but also increases the space on the side of the first electrode assembly 25 or the second electrode assembly 26 of the battery monomer 20 facing away from each other. Therefore, by arranging the cooling member on at least one side of the first electrode assembly 25 or the second electrode assembly 26 facing away from each other, the arrangement of the cooling member is facilitated.

[0131] In addition, the present application also provides a power consuming device comprising the battery 100 of any of the above embodiments.

[0132] The power consuming device provided by the embodiments of the present application can utilize the space in the width direction of the first wall 241 of each battery monomer 20 to arrange the first connecting portion 2521 and the second connecting portion 2522 in the width direction, thereby reducing the length direction space occupied by the first wall 241, increasing the length direction space between the first electrode assembly 25 and the second electrode assembly 26 of the battery monomer 20, and facilitating the arrangement and installation of other structures distributed outside the battery monomer 20.

[0133] 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 above embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery comprises: a housing having a first wall; a first electrode assembly arranged on the first wall, the first electrode assembly comprising a first electrode terminal and an adapter, the adapter comprising a first connecting portion and a second connecting portion which are both arranged on the same side of the first wall and are connected to each other, the first electrode terminal being connected to the first connecting portion, the first electrode terminal and the first connecting portion being made of the same material, and the first electrode terminal and the second connecting portion being made of different materials; a second electrode assembly arranged along the length direction of the first wall and spaced apart from the first electrode assembly; and the first connecting portion and the second connecting portion are arranged along the width direction of the first wall. The length direction of the adapter is parallel to the width direction of the first wall.

2. The battery cell of claim 1, wherein, Along the width direction of the first wall, the second connecting portion is located on one side of the first connecting portion, and the size of the second connecting portion is greater than the size of the first connecting portion.

3. The battery cell of claim 1, wherein, The second connecting portion comprises two sub-connecting portions, and the two sub-connecting portions are respectively located on both sides of the first connecting portion along the width direction of the first wall.

4. The battery cell of claim 1, wherein, The two sub-connecting portions are symmetrically arranged relative to the first connecting portion along the width direction of the first wall.

5. The battery cell of claim 4, wherein, Along the width direction of the first wall, the size of the second connecting portion is L1, and the size of the first wall is L; wherein 0.4L≤L1≤0.8L.

6. The battery cell of any one of claims 1-5, wherein, The second electrode assembly comprises a second electrode terminal and a second connecting member, the second connecting member is arranged on the same side of the first wall as the adapter, the second electrode terminal is connected to the second connecting member, and the second electrode terminal and the second connecting member are made of the same material; 7. The battery cell according to any one of claims 1 to 5, characterized in that, The length direction of the second connecting member is parallel to the width direction of the first wall. The second connecting portion has a welding mark area for welding with an external connecting sheet, and the welding mark area has one of a rectangular shape, a circular shape, or an elliptical shape.

8. The battery cell of any one of claims 1-5, wherein, The battery comprises a bus bar and at least two battery monomers arranged in a stack along a first direction, the first direction being parallel to the width direction of the first wall; 9. A battery, characterized by The material of the bus bar is the same as that of the second connecting portion, and the bus bar is used to connect the second connecting portion of one of the battery monomers. When the second connecting portion comprises two sub-connecting portions, the bus bar is used to connect one of the sub-connecting portions of the battery monomer; or the bus bar is used to simultaneously connect two of the sub-connecting portions of the battery monomer.

10. The battery of claim 9, wherein, The battery further comprises a flexible circuit board, at least part of the flexible circuit board being accommodated between the first electrode assembly and the second electrode assembly of at least one of the battery monomers; and / or 11. The battery of claim 9, wherein, The battery further comprises a pressing member arranged on at least one side of the first electrode assembly or the second electrode assembly away from each other; and / or The battery further comprises a cooling member arranged on at least one side of the first electrode assembly or the second electrode assembly away from each other. The battery comprises the battery as claimed in any one of claims 9-11.

12. An electrical device, characterized by ​

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