CN219873678U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The application discloses a battery monomer, a battery and electric equipment, and belongs to the technical field of batteries. The battery cell includes a housing including a first wall, an electrode assembly, a detection unit, a transfer assembly, and a first lead. The electrode assembly is disposed inside the case. The detection unit is disposed inside the case for detecting information of the electrode assembly. The switching subassembly sets up in first wall, and the switching subassembly includes first interface and second interface, and the second interface is used for being connected with the second wire that sets up in the battery monomer outside. The first wire is arranged in the shell, one end of the first wire is connected with the detection unit, and the other end of the first wire is connected with the first interface. The detection signals obtained by the detection unit inside the battery cell are sequentially transmitted to the battery management system through the first lead, the first interface, the second interface and the second lead in time. Therefore, the battery forms a risk management and control mechanism for early warning, early isolation and early treatment, and the reliability of the battery in use is improved.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Batteries are widely used in electronic devices such as electric vehicles, electric automobiles, electric airplanes, electric ships, and the like.

How to improve the reliability of the battery during use is a problem to be solved in battery technology.

Disclosure of Invention

In view of the above problems, the utility model provides a battery cell, a battery and electric equipment, which can improve the reliability of the battery in use.

In a first aspect, the present utility model provides a battery cell including a housing including a first wall, an electrode assembly, a detection unit, a switch assembly, and a first lead. The electrode assembly is disposed inside the case. The detection unit is disposed inside the case for detecting information of the electrode assembly. The switching subassembly sets up in first wall, and the switching subassembly includes first interface and second interface, and the second interface is used for being connected with the second wire that sets up in the battery monomer outside. The first wire is arranged in the shell, one end of the first wire is connected with the detection unit, and the other end of the first wire is connected with the first interface.

In the technical solution of the embodiment of the utility model, the housing comprises a first wall. The electrode assembly is disposed inside the case. The detection unit is disposed inside the case for detecting information of the electrode assembly. The switching subassembly sets up in first wall, and the switching subassembly includes first interface and second interface, and the second interface is used for being connected with the second wire that sets up in the battery monomer outside. The first wire is arranged in the shell, one end of the first wire is connected with the detection unit, and the other end of the first wire is connected with the first interface. The switching component provides a physical path for the detection unit inside the battery cell and the battery management system outside the battery cell, so that detection signals obtained by the detection unit inside the battery cell can be transmitted to the battery management system in time sequentially through the first lead, the first interface, the second interface and the second lead. Therefore, the battery forms a risk management and control mechanism for early warning, early isolation and early treatment, and the reliability of the battery in use is improved.

In some embodiments, a through hole is provided in the first wall, and the adapter assembly is disposed through the through hole. The through hole is worn to locate by the switching subassembly, on the one hand, and the assembly benchmark of switching subassembly can be regarded as to the through hole, improves the assembly efficiency of switching subassembly, on the other hand, and the through hole has been sealed to the switching subassembly simultaneously, has improved the solitary leakproofness of battery to a certain extent.

In some embodiments, the adapter assembly includes a first adapter plate and a second adapter plate, at least a portion of the first adapter plate being located inside the first wall, at least a portion of the second adapter plate being located outside the first wall, the first interface being disposed on the first adapter plate, the second interface being disposed on the second adapter plate, the first adapter plate and the second adapter plate being electrically connected. The first wire and the first adapter plate can be electrically connected first, the second wire and the second adapter plate can be electrically connected, and then the first adapter plate and the second adapter plate can be electrically connected, so that the first wire and the second wire can be electrically connected. The assembly action which needs to be completed in a narrower space inside the battery monomer is reduced, and the assembly difficulty of the battery monomer is reduced.

In some embodiments, the first interface is disposed on a side of the first adapter plate facing away from the first wall, and the second interface is disposed on a side of the second adapter plate facing away from the first wall. By the design, the first lead and the first interface are connected, and the second lead and the second interface are connected with each other with larger assembly space, so that the assembly difficulty of the battery cell is reduced.

In some embodiments, the switching assembly further comprises a butt-joint wire, the butt-joint wire is arranged through the through hole in a penetrating mode, a third interface is arranged on one side, facing the first wall, of the first switching plate, a fourth interface is arranged on one side, facing the first wall, of the second switching plate, one end of the butt-joint wire is connected with the third interface, and the other end of the butt-joint wire is connected with the fourth interface. The first adapter plate and the second adapter plate are electrically connected through the opposite wiring, so that the risk of interference of electromagnetic environment on transmission signals is reduced, and the strength of the transmission signals is improved.

In some embodiments, the adapter assembly further comprises a first seal disposed between the first adapter plate and the first wall, the first seal disposed around the through-hole; and/or, the adapter assembly further comprises a second sealing element, the second sealing element is arranged between the second adapter plate and the first wall, and the second sealing element surrounds the through hole. The first sealing piece and the second sealing piece improve the tightness of the switching assembly when being matched with the first wall, reduce the risk that foreign matters enter the battery monomer through the through holes to cause abnormal conditions such as short circuit and the like of the battery monomer, and improve the reliability of the battery monomer when in use.

In some embodiments, one of the first wall and the first adapter plate is provided with a first positioning hole, and the other is provided with a first positioning protrusion matched with the first positioning hole; and/or one of the first wall and the second adapter plate is provided with a second positioning hole, and the other one is provided with a second positioning protrusion matched with the second positioning hole. And the first positioning holes are matched with the first positioning protrusions, and/or the second positioning holes are matched with the second positioning protrusions, so that the assembly difficulty of the first adapter plate and the second adapter plate during assembly with the first wall is reduced.

In some embodiments, the first locating hole is disposed in the first adapter plate, the first locating protrusion is disposed in the first wall, and the first locating protrusion is welded to the first adapter plate. The welding operation can be implemented from one side of the first adapter plate, which is away from the first wall, so that the operation space is larger and the assembly difficulty is lower.

In some embodiments, the second locating hole is disposed in the second adapter plate, the second locating protrusion is disposed in the first wall, and the second locating protrusion is welded to the second adapter plate. The welding operation can be implemented from one side of the second adapter plate, which is away from the first wall, so that the operation space is larger and the assembly difficulty is lower.

In some embodiments, the first adapter plate has a maximum thickness T that satisfies: t is less than or equal to 5mm. In some embodiments, the minimum distance between the first wall and the electrode assembly is generally 5mm, and the maximum thickness of the first adapter plate is set within a reasonable range, so that the first adapter plate meets the actual working condition, and the additional cost is reduced.

In some embodiments, the first adapter plate and the second adapter plate are identical in structure. By the design, processing and assembly costs are saved.

In some embodiments, the battery cell further comprises an electrode terminal disposed on the first wall, and the height of the adapter assembly protruding from the outer surface of the first wall is no more than the height of the electrode terminal protruding from the outer surface of the first wall. By the design, the risk that the height of the switching component protruding out of the outer surface of the first wall is too high, and the assembling difficulty of the electrode terminal and the confluence part of the battery is increased is reduced.

In some embodiments, the battery cell further comprises a pressure relief mechanism disposed on the first wall. Along the thickness direction of the first wall, the projection of the switching component is not overlapped with the projection of the pressure release mechanism. By the design, the risk that the switching assembly interferes with normal pressure relief of the pressure relief mechanism when a battery cell body is in thermal runaway is reduced.

In some embodiments, the housing includes a shell having an opening and an end cap closing the opening, the first wall being the end cap. Compared with the scheme that the switching is gradually arranged on the side wall of the shell, the risk that the first interface and the second interface of the switching assembly are damaged due to the fact that the switching assembly is soaked in electrolyte can be reduced.

In some embodiments, the battery cell further includes a protective film for wrapping the electrode assembly, and the detection unit is formed on the protective film by spraying, screen printing, or 3D printing. By the design, the assembly of the detection unit can be completed while the protective film is produced, and the assembly efficiency is improved.

In some embodiments, the detection unit includes a circuit and an insulating layer, the circuit being located between the insulating layer and the protective film. By the design, the protective film is a part of the detection unit, so that the space occupied by the detection unit and the protective film in the battery cell is reduced, and the group margin in the battery cell is improved.

In some embodiments, the circuit is formed on the protective film by spraying, screen printing, or 3D printing, and the insulating layer is formed on the protective film by spraying, screen printing, or 3D printing. The detection unit adopts the forming mode, so that after the processing of the protective film is finished, the circuit can not protrude out of the protective film, and the risk of single-point overvoltage of the electrode assembly due to the fact that the circuit protrudes out of the protective film is reduced.

In some embodiments, the detection unit is located between the electrode assembly and an inner surface of the housing and is connected with the housing. The detection unit uses the shell as an assembly matrix, so that the assembly cost is low.

In some embodiments, the detecting unit is provided with a plurality of detecting units, and the first conductive wire is a flat cable. The flat cable is small in size and light in weight, and occupies small internal space of the battery monomer.

In a second aspect, the present application provides a battery comprising a battery management system and the battery cells of the above embodiments. The second interface of the switching assembly is connected with the battery management system through a second wire.

In a third aspect, the present application provides an electric device, where the electric device includes a battery unit in the foregoing embodiment, and the battery unit is used to provide electric energy; and/or the electric equipment comprises the battery in the embodiment, and the battery is used for providing electric energy.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the technical means thereof may be more clearly understood, and in order that the other objects, features and advantages of the present application may be more readily understood, the following detailed description of the application.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

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

fig. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present application;

fig. 4 is an exploded view of a partial structure of a battery cell according to some embodiments of the present application;

FIG. 5 is a bottom view of a first adapter plate according to some embodiments of the present application;

FIG. 6 is a top view of a first adapter plate according to some embodiments of the present application;

FIG. 7 is a front view of a first adapter plate according to some embodiments of the present application;

FIG. 8 is an isometric view of a second interposer according to some embodiments of the present application;

fig. 9 is a top view of a first wall of some embodiments of the application.

Reference numerals in the specific embodiments are as follows:

1000-vehicle; 200-a controller; 300-motor; 100-cell; 11-a box body; 111-a first part; 112-a second portion; 12-battery cells; 121-a housing; 1211-end caps; 1212-a housing; 1213-a first wall; 12131-through holes; 122-electrode assembly; 123-protective film; 124-a swivel plate; 125-electrode terminals; 126-a detection unit; 127-adaptor assembly; 1271-first adapter plate; 12711-first interface; 12712-third interface; 1272-a second adapter plate; 12721-second interface; 12722-fourth interface; 1273-pair wiring; 1274-a first seal; 1275-a second seal; 1276-a first positioning hole; 1277-second positioning hole; 128-a first wire; 129-second wire; 1210-pressure release mechanism.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by 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", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the present application, the battery cell may include, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like. The shape of the battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc. The battery cells may include, but are not limited to, cylindrical battery cells, prismatic battery cells, and pouch battery cells in a packaged manner.

In some high power applications, such as electric vehicles, the application of batteries includes three levels: battery cell, battery module, and battery. The battery module is formed by electrically connecting a certain number of battery cells together and putting the same into one frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system incorporated into the electric vehicle. Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a case for enclosing one or more battery cells. The case may reduce the risk of liquids or other foreign matter affecting the charging or discharging of the battery cells.

Hereinafter, it will be mainly developed around the rectangular parallelepiped battery cells. It should be understood that the embodiments described hereinafter are also applicable in certain respects to cylindrical battery cells or pouch battery cells.

In a typical cell structure, the cell includes a housing member, an electrode assembly, and an electrolyte. The case member may be an end cap, which closes an opening of the case, to define a receiving space for receiving the electrode assembly, or may be a case.

An electrode assembly is received in the receiving space, the electrode assembly including a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The number of positive electrode tabs is plural and stacked together, and the number of negative electrode tabs is plural and stacked together, so that the positive electrode tabs are not fused by a large current. In addition, the electrode assembly may be formed in a manner including, but not limited to, a roll type or a lamination type, etc.

The tabs typically draw electrical energy from the electrode assembly through electrical connection with a conductive member, which in some cases is a tab connecting the tab to an electrode terminal, and in some other cases is an electrode terminal.

The electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For rectangular parallelepiped battery cells, electrode terminals are typically provided at the end cap portions. In some other cases, the electrode terminals may also be provided at the case part. A plurality of battery cells are connected in series and/or parallel together via electrode terminals and through a bus member for use in various applications. Wherein the bus bar member may be referred to as a bus bar, and in some embodiments, the electrode terminals are welded to the bus bar to form an electrical connection.

For the battery cells, the main safety hazard comes from the charging and discharging process, and at the same time, the battery cells are generally provided with at least three protection measures for effectively avoiding unnecessary loss due to the proper environmental temperature design. In particular, the protective measures comprise at least a switching element, a selection of a suitable isolating membrane material and a pressure relief mechanism. A pressure relief mechanism refers to an element or component that actuates to relieve internal pressure or temperature of a battery cell when the internal pressure or temperature or other condition reaches a predetermined threshold. The threshold design varies according to design requirements. The threshold value may depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte and the separator in the battery cell. The pressure release mechanism may take the form of, for example, an explosion-proof valve, a gas valve, a pressure release valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell or other conditions reach a predetermined threshold, the pressure release mechanism performs an action or a weak structure provided in the pressure release mechanism is broken, thereby forming an opening or a channel through which the internal pressure or temperature can be released.

The term "actuated" as used herein refers to the pressure relief mechanism being actuated or activated to a state such that the internal pressure and temperature of the battery cells are relieved. When the pressure release mechanism is actuated, high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated position as emissions. In this way, the pressure and temperature of the battery cell can be relieved under the condition of controllable pressure or temperature, so that the occurrence of a potential serious accident is avoided.

The development of battery technology is to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and also to consider the reliability of the battery during use.

The method for monitoring the safety of the battery generally comprises the steps of deploying detection units such as voltage, current, temperature, stress, gas and the like on a battery cell or a battery module from a control panel, reporting data acquired by the detection units to a main controller, and carrying out abnormality diagnosis and processing by the main controller. But the external signal cannot timely feed back the internal change due to the blocking of the battery cell metal shell. Once failure warning signals such as lithium precipitation and short circuit occur in the battery cell, a main controller outside the battery cell cannot timely feed back the warning signals, and a risk management and control mechanism for early warning, early isolation and early disposal cannot be formed. The reliability of the battery is lower when the battery is used. But when the detection unit is arranged inside the battery, the problems of space constraint inside the battery and how internal signals are transmitted to the outside of the battery are faced.

In view of this, the present application provides a battery cell including a housing including a first wall, an electrode assembly, a detection unit, a switching assembly, and a first lead. The electrode assembly is disposed inside the case. The detection unit is disposed inside the case for detecting information of the electrode assembly. The switching subassembly sets up in first wall, and the switching subassembly includes first interface and second interface, and the second interface is used for being connected with the second wire that sets up in the battery monomer outside. The first wire is arranged in the shell, one end of the first wire is connected with the detection unit, and the other end of the first wire is connected with the first interface. The switching component provides a physical path for the detection unit inside the battery cell and the battery management system outside the battery cell, so that detection signals obtained by the detection unit inside the battery cell can be transmitted to the battery management system in time sequentially through the first lead, the first interface, the second interface and the second lead. Therefore, the battery forms a risk management and control mechanism for early warning, early isolation and early treatment, and the reliability of the battery in use is improved.

The technical scheme described by the embodiment of the application is suitable for battery monomers, batteries and electric equipment using the batteries.

Powered devices include, but are not limited to: battery cars, electric vehicles, ships, and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft, etc.

For convenience of description, the following embodiments take a powered device according to an embodiment of the present application as an example of the vehicle 1000.

For example, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application, where the vehicle 1000 may be a fuel-oil vehicle, a gas-oil vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The motor 300, the controller 200, and the battery 100 may be provided in the vehicle 1000, and the controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 may be provided at the bottom or the head or tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for circuitry of vehicle 1000, for example, for operating power requirements during start-up, navigation, and operation of vehicle 1000. In another embodiment of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

To meet different power requirements, the battery 100 may include a plurality of battery cells 12, where the plurality of battery cells 12 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to a mixture of series and parallel connections. Battery 100 may also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 may be connected in series or parallel or in series to form a battery module, and then connected in series or parallel or in series to form the battery 100. That is, the plurality of battery cells 12 may be directly assembled into the battery 100, or may be assembled into a battery module, and the battery module may be assembled into the battery 100.

For example, referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application, and the battery 100 may include a plurality of battery cells 12. The battery 100 may further include a case 11, in which the case 11 has a hollow structure, and a plurality of battery cells 12 are accommodated in the case 11. As shown in fig. 2, referred to herein as first portion 111 and second portion 112, respectively, first portion 111 and second portion 112 snap together. The shape of the first portion 111 and the second portion 112 may be determined according to the shape of the combination of the plurality of battery cells 12, and each of the first portion 111 and the second portion 112 may have one opening. For example, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and each has only one surface as an open surface, the opening of the first portion 111 and the opening of the second portion 112 are disposed opposite to each other, and the first portion 111 and the second portion 112 are fastened to each other to form the case 11 having a closed chamber. The plurality of battery cells 12 are mutually connected in parallel or in series-parallel combination and then are placed in the box 11 formed by buckling the first part 111 and the second part 112.

Alternatively, the battery 100 may further include other structures, which are not described in detail herein. For example, the cell may also include a bussing member for making electrical connection between the plurality of cells 12, such as parallel or series-parallel. Specifically, the bus member may realize electrical connection between the battery cells 12 by connecting the electrode terminals 125 of the battery cells 12. Further, the bus member may be fixed to the electrode terminal 125 of the battery cell 12 by welding. The electric power of the plurality of battery cells 12 may be further led out through the case 11 by the conductive mechanism.

The number of battery cells 12 may be set to any number depending on the different power requirements. The plurality of battery cells 12 may be connected in series, parallel, or series-parallel to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, the battery cells 12 may be arranged in groups for easy installation, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in the battery module is not limited and may be set according to requirements. The battery 100 may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 12 according to some embodiments of the present application, the battery cell 12 including one or more electrode assemblies 122 and a housing 121. The case 121 may include a case 1212, and a plurality of walls of the case 1212, i.e., a plurality of walls of the case 121, enclose a cavity, which may be used to accommodate the electrode assembly 122. The case 1212 is determined according to the shape of the combined one or more electrode assemblies 122, for example, the case 1212 may be a hollow rectangular parallelepiped or square or regular polyhedron, and one face of the case 1212 has an opening so that one or more electrode assemblies 122 may be placed in the case 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

The battery cell 12 may further include two electrode terminals 125, and the two electrode terminals 125 may be disposed on the end cap 1211. The end cap 1211 is generally in the shape of a flat plate, and two electrode terminals 125 are fixed to the flat plate surface of the end cap 1211, the two electrode terminals 125 being a positive electrode terminal and a negative electrode terminal, respectively. Each electrode terminal 125 is provided with a corresponding one of the adapter pieces 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 125. In the battery cell 12, the electrode assembly 122 may be provided in a single unit, or in a plurality of units, according to actual use requirements, and a plurality of independent electrode assemblies 122 are provided in the battery cell 12.

Referring to fig. 3 and 4, according to some embodiments of the present application, a battery cell 12 is provided, wherein the battery cell 12 includes a housing 121, an electrode assembly 122, a detection unit 126, a switching assembly 127, and a first wire 128, and the housing 121 includes a first wall 1213. The electrode assembly 122 is disposed inside the case 121. The detection unit 126 is disposed inside the case 121 for detecting information of the electrode assembly 122. The adapter assembly 127 is disposed on the first wall 1213, and the adapter assembly 127 includes a first interface 12711 and a second interface 12721, the second interface 12721 being configured to connect with a second wire 129 disposed on the exterior of the battery cell 12. The first wire 128 is disposed inside the housing 121, and one end of the first wire 128 is connected to the detecting unit 126, and the other end is connected to the first interface 12711.

The case 121 generally includes a case 1212 and an end cap 1211, the case 1212 having an opening, the end cap 1211 closing the opening to form an accommodating space for accommodating the electrode assembly 122, the inside of the case 121 generally referring to the inside of the accommodating space, and the outside of the case 121 generally referring to the outside of the accommodating space. The first wall 1213 may be an end cap 1211 or a wall portion of the housing 1212.

The first interface 12711 and the second interface 12721 may be wire connectors, may be flat cable connectors, or may be soldered joints for making electrical connection with conductive members.

The detection unit 126 may be a thin film sensor, typically comprising an insulating layer, circuitry, and a substrate, the circuitry typically comprising a sensitive layer and electrodes. The sensitive layer is a powdery substance, typically made of oxide particles or nano-materials. The resistance of the sensitive layer changes, and information such as pressure, stress, temperature of the electrode assembly 122, and gas pressure generated by the electrode assembly 122 can be reflected. The electrodes are used to convert the resistance change of the sensitive layer into an electrical signal. The electrode is typically electrically connected to the second wire 129 and the host.

The shape, size and accuracy of the detection unit 126 can be adjusted according to the detection requirements.

In some embodiments, a plurality of detection units 126 may be disposed, where the plurality of detection units 126 are distributed on the entire outer peripheral surface of the electrode assembly 122, and the plurality of detection units 126 formed on the protective film 123 may form a plurality of detection areas, where each detection area may obtain a sensing signal such as expansion force of multiple points of the electrode assembly 122 and/or stress and/or air pressure and/or temperature, so as to detect signals such as expansion force of the electrode assembly 122, stress of the electrode assembly 122, air pressure inside the battery cell 12 and temperature of the electrode assembly 122. The signals can be transmitted to an upper computer for processing through wires and the like, the upper computer can be a computer, a processor and the like in the process of testing the battery 100, the upper computer can be a battery management system of the battery 100 in the process of using the battery 100, the battery management system can present the expansion force of the regional electrode assembly 122, the stress of the electrode assembly 122, the air pressure in the battery cell 12 and the temperature distribution diagram of the electrode assembly 122 and corresponding specific values after processing the sensing signals, and the information of each region is compared and analyzed, and the operations such as targeted early warning and the like are carried out on the region with abnormal information.

The signal of the detecting unit 126 is led out through the switching assembly 127, so that the wire for transmitting the signal of the detecting unit 126 is at least partially positioned inside the first wall 1213, thereby saving the space inside the battery 100 to some extent.

In the embodiment of the present application, the housing 121 includes a first wall 1213. The electrode assembly 122 is disposed inside the case 121. The detection unit 126 is disposed inside the case 121 for detecting information of the electrode assembly 122. The adapter assembly 127 is disposed on the first wall 1213, and the adapter assembly 127 includes a first interface 12711 and a second interface 12721, the second interface 12721 being configured to connect with a second wire 129 disposed on the exterior of the battery cell 12. The first wire 128 is disposed inside the housing 121, and one end of the first wire 128 is connected to the detecting unit 126, and the other end is connected to the first interface 12711. The switching component 127 provides a physical path for the detection unit 126 inside the battery cell 12 and the battery management system outside the battery cell 12, so that the detection signal obtained by the detection unit 126 inside the battery cell 12 can be transmitted to the battery management system in time sequentially through the first wire 128, the first interface 12711, the second interface 12721 and the second wire 129. So that the battery 100 forms a risk management and control mechanism of early warning, early isolation and early treatment, and the reliability of the battery 100 in use is improved.

Referring to fig. 4, a through hole 12131 is provided in the first wall 1213, and the adapter 127 is disposed through the through hole 12131 according to some embodiments of the present application.

The fact that the adapter assembly 127 is disposed through the through hole 12131 means that a portion of the adapter assembly 127 is disposed within the through hole 12131, another portion of the adapter assembly 127 is disposed inside the first wall 1213, and another portion of the adapter assembly 127 is disposed outside the first wall 1213. Wherein the inside of the first wall 1213 generally refers to the inside of the accommodation space and the outside of the first wall 1213 generally refers to the outside of the accommodation space.

In some embodiments, after the adaptor assembly 127 is inserted through the through hole 12131, the adaptor assembly 127 generally closes the through hole 12131.

The through hole 12131 is worn to locate by the switching subassembly 127, on the one hand, and the through hole 12131 can be regarded as the assembly benchmark of switching subassembly 127, improves the assembly efficiency of switching subassembly 127, and on the other hand, switching subassembly 127 has sealed through hole 12131 simultaneously, has improved the leakproofness of battery monomer 12 to a certain extent.

Referring to fig. 4 and 5, according to some embodiments of the present application, the adapter assembly 127 includes a first adapter plate 1271 and a second adapter plate 1272, at least a portion of the first adapter plate 1271 is located on the inner side of the first wall 1213, at least a portion of the second adapter plate 1272 is located on the outer side of the first wall 1213, a first interface 12711 is provided on the first adapter plate 1271, a second interface 12721 is provided on the second adapter plate 1272, and the first adapter plate 1271 and the second adapter plate 1272 are electrically connected.

The materials of the first adapter plate 1271 and the second adapter plate 1272 may include, but are not limited to, fiberglass cloth, polyvinyl chloride, etc.

The first and second adapter plates 1271 and 1272 may be identical or different in structure.

The first interface 12711 may be disposed within the first adapter plate 1271, i.e., in the thickness direction of the first adapter plate 1271, the first interface 12711 does not protrude beyond the surface of the first adapter plate 1271. The second interface 12721 may be disposed inside the second adapter plate 1272, i.e., in the thickness direction of the second adapter plate 1272, the second interface 12721 does not protrude from the surface of the second adapter plate 1272.

The first attachment plate 1271 may be attached to the first wall 1213 by welding or by a fastener connection or the like. The second adapter plate 1272 may be coupled to the first wall 1213 by welding or by a fastener connection, or the like.

When the first and second patch panels 1271, 1272 are electrically connected, at least a portion of the first patch panel 1271 and/or at least a portion of the second patch panel 1272 are positioned within the through-hole 12131.

In some embodiments, the first adapter plate 1271 and the second adapter plate 1272 may be directly plugged to form an electrical connection, the first interface 12711 is a flat cable, and the second interface 12721 is a flat cable plug interface; alternatively, the first interface 12711 is a flat cable interface and the second interface 12721 is a flat cable.

The electrical connection between the first conductive line 128 and the first patch panel 1271 and the electrical connection between the second conductive line 129 and the second patch panel 1272 may be performed first, and then the electrical connection between the first patch panel 1271 and the second patch panel 1272 may be performed, so that the electrical connection between the first conductive line 128 and the second conductive line 129 may be performed. The assembly action which needs to be completed in a narrower space inside the battery cell 12 is reduced, and the assembly difficulty of the battery cell 12 is reduced.

Referring to fig. 4 and 5, according to some embodiments of the present application, the first interface 12711 is disposed on a side of the first adapter plate 1271 facing away from the first wall 1213, and the second interface 12721 is disposed on a side of the second adapter plate 1272 facing away from the first wall 1213.

Because the first adapter plate 1271 and the second adapter plate 1272 are connected to the first wall 1213 and substantially fit the first wall 1213, a side of the first adapter plate 1271 facing away from the first wall 1213 and a side of the second adapter plate 1272 facing away from the first wall 1213 have relatively large installation spaces.

The first interface 12711 is disposed on a side of the first adapter plate 1271 facing away from the first wall 1213, and the second interface 12721 is disposed on a side of the second adapter plate 1272 facing away from the first wall 1213. Meaning that the connection of the first interface 12711 to the first wire 128 and the connection of the second interface 12721 to the second wire 129 may be completed after the first and second patch panels 1271 and 1272 are connected to the first wall 1213.

The first interface 12711 is disposed on a side of the first adapter plate 1271 facing away from the first wall 1213, and the second interface 12721 is disposed on a side of the second adapter plate 1272 facing away from the first wall 1213. By adopting the design, the first lead 128 and the first interface 12711 are connected, and the second lead 129 and the second interface 12721 are connected, so that a larger assembly space is provided, and the assembly difficulty of the battery cell 12 is reduced.

Referring to fig. 4-8, according to some embodiments of the present application, the adapter assembly 127 further includes a docking line 1273, the docking line 1273 is disposed through the through hole 12131, a third interface 12712 is disposed on a side of the first adapter plate 1271 facing the first wall 1213, a fourth interface 12722 is disposed on a side of the second adapter plate 1272 facing the first wall 1213, one end of the docking line 1273 is connected to the third interface 12712, and the other end of the docking line 1273 is connected to the fourth interface 12722.

The docking line 1273 may be a wire or a flat cable.

In the example of a bit line for the docking line 1273, the docking line 1273 generally includes leads and pins, the pins being integrated on the leads, the number of pins generally being equal to or greater than two.

After the first conductive wire 128 is connected to the first adapter plate 1271, the assembly process of the first adapter plate 1271, the docking line 1273 and the second adapter plate 1272 is generally as follows, wherein the first adapter plate 1271 and the docking line 1273 are connected first, and the docking line 1273 passes through the through hole 12131 from bottom to top and out of the first wall 1213. Next, the first adapter plate 1271 is fixed inside the first wall 1213 so that the first wall 1213 is tightly engaged with the first adapter plate 1271. And then connecting the docking line 1273 and the second adapter plate 1272, fixing the second adapter plate 1272 outside the first wall 1213, and after the second lead 129 is connected with the second interface 12721, leading out the signal of the detection unit 126 inside the battery cell 12 to the outside of the battery cell 12 through the adapter assembly 127.

Transmitting the signal of the detection unit 126 through the first wire 128, the second wire 129 and the docking wire 1273 may reduce the risk of data loss due to wireless transmission. Meanwhile, the data transmission rate and the transmission efficiency can be improved, the power supply of the detection unit 126 can also be directly supplied by the power supply outside the battery cell 12 through the docking line 1273, and the risk of the electric quantity loss of the battery cell 12 is reduced.

The first adapter plate 1271 and the second adapter plate 1272 are electrically connected through the butt joint line 1273, so that the risk of interference of electromagnetic environment on transmission signals is reduced, and the strength of the transmission signals is improved.

Referring to fig. 4-8, according to some embodiments of the present application, the adapter assembly 127 further includes a first seal 1274, the first seal 1274 being disposed between the first adapter plate 1271 and the first wall 1213, the first seal 1274 being disposed around the through-hole 12131; and/or, the adapter assembly 127 further includes a second seal 1275, the second seal 1275 being disposed between the second adapter plate 1272 and the first wall 1213, the second seal 1275 being disposed about the through-hole 12131.

The material of the first seal 1274 and/or the second seal 1275 may include, but is not limited to, polyvinyl chloride, polyimide, and the like.

The first seal 1274 may be a separate seal ring or may be a seal formed on the first adapter plate 1271. The second seal 1275 may be a separate seal ring or may be a seal formed with the second adapter plate 1272.

The first sealing member 1274 and the second sealing member 1275 improve the sealing performance when the switching assembly 127 is matched with the first wall 1213, reduce the risk of abnormal conditions such as short circuit and the like of the battery cell 12 caused by foreign matters entering the battery cell 12 through the through hole 12131, and improve the reliability of the battery cell 12 in use.

Referring to fig. 4-8, according to some embodiments of the present application, one of the first wall 1213 and the first adapter plate 1271 is provided with a first positioning hole 1276, and the other is provided with a first positioning protrusion that mates with the first positioning hole 1276; and/or, one of the first wall 1213 and the second adapter plate 1272 is provided with a second positioning hole 1277, and the other is provided with a second positioning protrusion which is matched with the second positioning hole 1277.

The number of the first positioning holes 1276 and/or the second positioning holes 1277 may be one or a plurality. The first positioning hole 1276 and/or the second positioning hole 1277 may be a through hole 12131 or a blind hole.

The above-mentioned mating means that at least part of the protrusions are located in the holes.

The mating of the first locating hole 1276 and the first locating protrusion, and/or the mating of the second locating hole 1277 and the second locating protrusion, reduces the difficulty of assembly when the first adapter plate 1271 and the second adapter plate 1272 are assembled with the first wall 1213.

Referring to fig. 4-6, according to some embodiments of the present application, a first positioning hole 1276 is provided on a first adapter plate 1271, a first positioning protrusion is provided on a first wall 1213, and the first positioning protrusion is welded to the first adapter plate 1271.

The first protrusion may be welded to the first attachment plate 1271 by a multi-point welding or by a circumferential welding.

The welding operation can be performed from the side of the first adapter plate 1271 facing away from the first wall 1213, which is more space-consuming and less difficult to assemble.

Referring to fig. 4 and 8, according to some embodiments of the present application, a second positioning hole 1277 is provided on the second adapter plate 1272, a second positioning protrusion is provided on the first wall 1213, and the second positioning protrusion is welded to the second adapter plate 1272.

The second protrusion may be welded to the second adapter plate 1272 by a multi-point welding or a circumferential welding.

The welding operation can be performed from the side of the second adapter plate 1272 away from the first wall 1213, so that the operation space is larger and the assembly difficulty is lower.

Referring to fig. 7, according to some embodiments of the present application, the maximum thickness of the first adapting plate 1271 is T, which satisfies the following: t is less than or equal to 5mm.

The maximum thickness of the first adapting plate 1271 generally refers to the maximum dimension of the first adapting plate 1271 in the thickness direction of the first adapting plate 1271.

The maximum thickness T of the first adapter plate 1271 may be any value greater than 0 and equal to or less than 5, for example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm.

In some embodiments, the minimum distance between the first wall 1213 and the electrode assembly 122 is typically 5mm, and the maximum thickness of the first adapter plate 1271 is set within a reasonable range, so that the first adapter plate 1271 conforms to the actual conditions, and additional costs are reduced.

Referring to fig. 4-8, the first patch panel 1271 and the second patch panel 1272 are identical in structure according to some embodiments of the present application.

In some embodiments, the first and second patch panels 1271 and 1272 are identical in construction and are symmetrically disposed about the first wall 1213.

The first and second patch panels 1271 and 1272 are identical in structure. By the design, processing and assembly costs are saved.

According to some embodiments of the present application, the battery cell 12 further includes an electrode terminal 125, the electrode terminal 125 is disposed on the first wall 1213, and the height of the adapter component 127 protruding from the outer surface of the first wall 1213 does not exceed the height of the electrode terminal 125 protruding from the outer surface of the first wall 1213. Such a design reduces the risk that the height of the adapter assembly 127 protruding from the outer surface of the first wall 1213 is too high, resulting in increased difficulty in assembling the electrode terminal 125 with the bus member of the battery 100.

Referring to fig. 3 and 9, according to some embodiments of the present application, the battery cell 12 further includes a pressure release mechanism 1210, and the pressure release mechanism 1210 is disposed on the first wall 1213. Along the thickness of the first wall 1213, the projection of the adapter assembly 127 does not overlap with the projection of the pressure relief mechanism 1210.

The pressure relief mechanism 1210 may be various possible pressure relief structures, for example, the pressure relief mechanism 1210 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 12 provided with the pressure relief mechanism 1210 reaches a threshold value, and/or the pressure relief mechanism 1210 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal air pressure of the battery cell 12 provided with the pressure relief mechanism 1210 reaches a threshold value.

The pressure relief mechanism 1210 is disposed on the first wall 1213. Along the thickness of the first wall 1213, the projection of the adapter assembly 127 does not overlap with the projection of the pressure relief mechanism 1210. Such a design reduces the risk of the adapter assembly 127 interfering with the normal pressure relief of the pressure relief mechanism 1210 in the event of thermal runaway of the battery cells 12.

Referring to fig. 3, according to some embodiments of the present application, the housing 121 includes a housing 1212 and an end cap 1211, the housing 1212 has an opening, the end cap 1211 closes the opening, and the first wall 1213 is the end cap 1211.

In some embodiments, end cap 1211 closes open back end cap 1211 and housing 1212 are connected by welding.

The risk of damage to the first and second ports 12711, 12721 of the adapter assembly 127 by the electrolyte soaking the adapter assembly 127 can be reduced compared to an approach in which the adapter is gradually disposed on the side wall of the housing 121.

Referring to fig. 3, according to some embodiments of the present application, the battery cell 12 further includes a protective film 123, the protective film 123 is used to wrap the electrode assembly 122, and the detection unit 126 is formed on the protective film 123 by spraying, screen printing or 3D printing.

The molding of the detection unit 126 to the protection film 123 means that the detection unit 126 is molded to the protection film 123 while the protection film 123 is produced, and the protection film 123 may serve as an insulating layer and/or a base of the detection unit 126 while keeping the thickness of the protection film 123 substantially unchanged. Further, the group margin of the battery cells 12 is improved, which can be understood as a percentage of the electrode assembly 122 in the internal space of the battery cells 12.

The detection unit 126 may be formed on both surfaces of the protective film 123 in the thickness direction thereof or inside the protective film 123.

The spraying may be referred to as a powder spraying process, whereby different raw materials may be sprayed onto the carrier table, forming a layered structure after solidification of the powder, such as an insulating layer, a circuit, a substrate, etc. forming the detection unit 126.

The screen printing process may print the circuit on the substrate, heat cure the printed circuit after the printing is completed to form the circuit on the protective film 123, then attach the insulating layer on the substrate, and form the insulating layer, the circuit and the substrate into an integrated structure through a hot pressing process or the like. The protective film 123 may serve as a base and/or an insulating layer. In the embodiment in which the protective film 123 is used as the base and the insulating layer, the base, the insulating layer, and the circuit may be used as a three-layer structure, the protective film 123 may be formed by a hot pressing process, and the thickness of the protective film 123 may be substantially uniform with that of the protective film 123 manufactured by a conventional method.

The detection unit 126 may be formed on the protective film 123 by printing the substrate using a 3D printing apparatus, replacing the powder to print the circuit on the substrate, and finally replacing the powder to cover the circuit and the substrate with an insulating layer.

By the design, the assembly of the detection unit 126 can be completed while the protective film 123 is produced, and the assembly efficiency is improved.

Referring to fig. 3, the detecting unit 126 includes a circuit and an insulating layer, and the circuit is located between the insulating layer and the protective film 123 according to some embodiments of the present application.

The circuit is located between the insulating layer and the protective film 123, meaning that the unnecessary substrate of the detection unit 126 need only include the circuit and the insulating layer, and its total thickness is reduced. Or it can be understood that the protective film 123 serves as a base of the detecting unit 126, that is, the protective film 123 is a part of the detecting unit 126.

The detection unit 126 includes a circuit and an insulating layer, and the circuit is located between the insulating layer and the protective film 123, so that the protective film 123 is a part of the detection unit 126, the space inside the battery cell 12 is reduced by the detection unit 126 and the protective film 123 together, and the group margin inside the battery cell 12 is improved.

By the design, the protective film 123 is a part of the detection unit 126, so that the space occupied by the detection unit 126 and the protective film 123 in the battery cell 12 is reduced, and the group margin in the battery cell 12 is improved.

According to some embodiments of the present application, referring to fig. 3, the circuit is formed on the protective film 123 by spraying, screen printing or 3D printing, and the insulating layer is formed on the protective film 123 by spraying, screen printing or 3D printing.

The insulating layer is formed on the protective film 123 by spraying, screen printing or 3D printing, which means that in some embodiments, the insulating layer can completely cover the protective film 123, the circuit is located between the insulating layer and the protective film 123, the gaps between adjacent circuits can be filled with powder for forming the insulating layer through the above process, so that the circuit cannot protrude out of the protective film 123, and meanwhile, the number of points where stress concentration exists in the protective film 123 can be reduced, and the risk of single-point overvoltage of the electrode assembly 122 is reduced.

The detection unit 126 adopts the above-mentioned shaping mode, makes the protection film 123 after processing is accomplished, and the circuit can not bulge in the protection film 123, has reduced because the circuit bulge in the protection film 123, leads to the risk of electrode assembly 122 single-point excessive pressure.

According to some embodiments of the present application, referring to fig. 3, a detection unit 126 is positioned between the electrode assembly 122 and the inner surface of the case 121 and is connected to the case 121.

In some embodiments, the detection unit 126 may be secured to the inner surface of the housing 121 by fasteners such as bolts.

The detection unit 126 uses the housing 121 as an assembly substrate, so that the assembly cost is low.

According to some embodiments of the present application, the detecting unit 126 is provided with a plurality of detecting wires, and the first conductive wire 128 is a flat cable. The flat cable is small in size and light in weight, and occupies a small internal space of the battery cell 12.

According to some embodiments of the present application, there is provided a battery 100 including a battery management system and a battery cell 12 as described in any of the above aspects. Wherein the second interface 12721 of the adapter assembly 127 is connected to the battery management system via the second wire 129.

According to some embodiments of the present application, there is provided an electric device, where the electric device includes a battery cell 12 according to any of the above schemes, and the battery cell 12 is used to provide electric energy; and/or the electric equipment comprises the battery 100 according to any of the above schemes, and the battery 100 is used for providing electric energy.

According to some embodiments of the present application, referring to fig. 3-9, the present application provides a battery cell 12, the battery cell 12 including a housing 121, an electrode assembly 122, a detection unit 126, a transfer assembly 127, and a first lead 128, the housing 121 including a case 1212 and an end cap 1211, the case 1212 having an opening, the end cap 1211 closing the opening. The electrode assembly 122 is disposed inside the case 121. The battery cell 12 further includes a protective film 123, the protective film 123 is used for wrapping the electrode assembly 122, and the detection unit 126 is formed on the protective film 123 by spraying, screen printing or 3D printing. The detection unit 126 is disposed inside the case 121 for detecting information of the electrode assembly 122.

The adapter assembly 127 is disposed on the end cap 1211, and the adapter assembly 127 includes a first interface 12711 and a second interface 12721, the second interface 12721 being configured to connect with a second wire 129 disposed on the exterior of the battery cell 12. The first wire 128 is disposed inside the housing 121, and one end of the first wire 128 is connected to the detecting unit 126, and the other end is connected to the first interface 12711. The end cap 1211 is provided with a through hole 12131, and the adapter assembly 127 is disposed through the through hole 12131.

The adapter assembly 127 includes a first adapter plate 1271 and a second adapter plate 1272, the first adapter plate 1271 and the second adapter plate 1272 being identical in construction. At least a portion of the first patch panel 1271 is positioned inside the end cap 1211 and at least a portion of the second patch panel 1272 is positioned outside the end cap 1211, the first interface 12711 is disposed on the first patch panel 1271, the second interface 12721 is disposed on the second patch panel 1272, and the first patch panel 1271 and the second patch panel 1272 are electrically connected by a docking line 1273.

The docking line 1273 is disposed through the through hole 12131, a third interface 12712 is disposed on a side of the first adapter plate 1271 facing the end cover 1211, a fourth interface 12722 is disposed on a side of the second adapter plate 1272 facing the end cover 1211, one end of the docking line 1273 is connected to the third interface 12712, and the other end of the docking line 1273 is connected to the fourth interface 12722.

The adapter assembly 127 further includes a first seal 1274 and a second seal 1275, the first seal 1274 being disposed between the first adapter plate 1271 and the end cap 1211, the first seal 1274 being disposed about the through-hole 12131, the second seal 1275 being disposed between the second adapter plate 1272 and the end cap 1211, the second seal 1275 being disposed about the through-hole 12131.

The first adapter plate 1271 is provided with first positioning holes 1276, first positioning protrusions are provided on the end cover 1211, and the first positioning protrusions are welded with the first adapter plate 1271. The second adapter plate 1272 is provided with a second positioning hole 1277, a second positioning protrusion is provided at the end cover 1211, and the second positioning protrusion is welded with the second adapter plate 1272.

The battery cell 12 further includes an electrode terminal 125, the electrode terminal 125 is disposed on the end cover 1211, and the height of the adapter component 127 protruding from the outer surface of the end cover 1211 does not exceed the height of the electrode terminal 125 protruding from the outer surface of the end cover 1211. The battery cell 12 further includes a pressure relief mechanism 1210, where the pressure relief mechanism 1210 is disposed in the end cap 1211. Along the thickness of end cap 1211, the projection of adapter assembly 127 does not overlap with the projection of pressure relief mechanism 1210.

When the adapter assembly 127 is applied to the battery cells 12 having dimensions 141mm×50mm×95mm (length×width×height), the end cap 1211 has dimensions 141mm×50mm (length×width). The number of pins of the docking line 1273 is 13, the width of a single pin is 1mm, the size of the docking line 1273 is 30mm×5mm (length×width), the size of the first and second interposer 1271 and 1272 is 10mm×4.5mm (length×width), and the width of the through hole 12131 is 30mm.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (21)

1. A battery cell, comprising:

a housing comprising a first wall;

an electrode assembly disposed inside the case;

a detection unit disposed inside the case for detecting information of the electrode assembly;

the switching assembly is arranged on the first wall and comprises a first interface and a second interface, and the second interface is used for being connected with a second lead arranged outside the battery cell;

the first lead is arranged in the shell, one end of the first lead is connected with the detection unit, and the other end of the first lead is connected with the first interface.

2. The battery cell of claim 1, wherein the first wall is provided with a through hole, and the adapter assembly is disposed through the through hole.

3. The battery cell of claim 2, wherein the adapter assembly comprises a first adapter plate and a second adapter plate, at least a portion of the first adapter plate is positioned inside the first wall, at least a portion of the second adapter plate is positioned outside the first wall, the first interface is disposed on the first adapter plate, the second interface is disposed on the second adapter plate, and the first adapter plate and the second adapter plate are electrically connected.

4. The battery cell of claim 3, wherein the first interface is disposed on a side of the first adapter plate facing away from the first wall, and the second interface is disposed on a side of the second adapter plate facing away from the first wall.

5. The battery cell of claim 3, wherein the adapter assembly further comprises a pair of wires, the pair of wires are arranged through the through hole, a third interface is arranged on one side of the first adapter plate facing the first wall, a fourth interface is arranged on one side of the second adapter plate facing the first wall, one end of the pair of wires is connected with the third interface, and the other end of the pair of wires is connected with the fourth interface.

6. The battery cell of claim 3, wherein the adapter assembly further comprises a first seal disposed between the first adapter plate and the first wall, the first seal disposed around the through-hole;

and/or, the switching assembly further comprises a second sealing piece, wherein the second sealing piece is arranged between the second switching plate and the first wall, and the second sealing piece surrounds the through hole.

7. The battery cell of claim 3, wherein one of the first wall and the first adapter plate is provided with a first positioning hole, and the other is provided with a first positioning protrusion that mates with the first positioning hole;

and/or one of the first wall and the second adapter plate is provided with a second positioning hole, and the other one is provided with a second positioning protrusion matched with the second positioning hole.

8. The battery cell of claim 7, wherein the first locating hole is disposed in the first adapter plate, the first locating protrusion is disposed in the first wall, and the first locating protrusion is welded to the first adapter plate.

9. The battery cell of claim 7, wherein the second locating hole is disposed in the second adapter plate, the second locating protrusion is disposed in the first wall, and the second locating protrusion is welded to the second adapter plate.

10. The battery cell of claim 3, wherein the first adapter plate has a maximum thickness T that satisfies: t is less than or equal to 5mm.

11. The battery cell of claim 3, wherein the first adapter plate and the second adapter plate are identical in structure.

12. The battery cell of claim 3, further comprising an electrode terminal disposed on the first wall, wherein the height of the adapter assembly protruding from the outer surface of the first wall does not exceed the height of the electrode terminal protruding from the outer surface of the first wall.

13. The battery cell of any one of claims 1-12, further comprising a pressure relief mechanism disposed on the first wall; along the thickness direction of the first wall, the projection of the switching component is not overlapped with the projection of the pressure relief mechanism.

14. The battery cell of any one of claims 1-12, wherein the housing further comprises a shell having an opening and an end cap closing the opening, the first wall being an end cap.

15. The battery cell of any one of claims 1-12, further comprising a protective film for encasing the electrode assembly, wherein the detection unit is molded onto the protective film by spraying, screen printing, or 3D printing.

16. The battery cell of claim 15, wherein the detection unit includes a circuit and an insulating layer, the circuit being located between the insulating layer and the protective film.

17. The battery cell of claim 16, wherein the circuit is formed on the protective film by spraying, screen printing, or 3D printing, and the insulating layer is formed on the protective film by spraying, screen printing, or 3D printing.

18. The battery cell of any one of claims 1-12, wherein the detection unit is located between the electrode assembly and an inner surface of the housing and is connected to the housing.

19. The battery cell of any one of claims 1-12, wherein the detection unit is provided in plurality, and the first wire is a flat cable.

20. A battery comprising a battery management system and the battery cell of any one of claims 1-19;

the second interface of the switching assembly is connected with the battery management system through a second wire.

21. An electrical device comprising a battery cell as claimed in any one of claims 1-19, the battery cell being configured to provide electrical energy;

and/or the powered device includes a battery as claimed in claim 20 for providing electrical energy.