Battery cell, battery and electric device

Abstract

A battery (100) comprises a battery cell (12). The battery cell (12) comprises a casing (121), an electrode assembly (122), a test unit (126), an adapter assembly (127) and a first wire (128), wherein the casing (121) comprises a first wall (1213), and the electrode assembly (122) is arranged inside the casing (121). The test unit (126) is arranged inside the casing (121), and the test unit (126) is configured to test information of the electrode assembly (122). The adapter assembly (127) is arranged on the first wall (1213), and the adapter assembly (127) comprises a first interface (12711) and a second interface (12721), the second interface (12721) being configured to connect to a second wire (129) which is arranged outside the battery cell (12). The first wire (128) is arranged inside the casing (121), one end of the first wire (128) being connected to the test unit (126), and the other end thereof being connected to the first interface (12711). A test signal obtained by the test unit (126) inside the battery cell (12) is timely transmitted to a battery management system through the first wire (128), the first interface (12711), the second interface (12721) and the second wire (129) in sequence; thus, the battery (100) forms a risk management and control mechanism of early warning, early isolation and early disposal, thereby improving the reliability of the battery (100) when in use.

Description

Battery cells, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202321866338.6, filed on July 17, 2023, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Batteries are widely used in electronic devices such as electric vehicles, electric cars, electric airplanes, electric ships, etc.

[0005] How to improve the reliability of batteries during use is an urgent problem to be solved in battery technology.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery during use.

[0008] In a first aspect, the present application provides a battery cell, which includes a housing, an electrode assembly, a detection unit, a switching assembly, and a first wire, wherein the housing includes a first wall. The electrode assembly is disposed inside the housing. The detection unit is disposed inside the housing for detecting information about the electrode assembly. The switching assembly is disposed on the first wall, and the switching assembly includes a first interface and a second interface, wherein the second interface is used to connect to a second wire disposed outside the battery cell. The first wire is disposed inside the housing, and one end of the first wire is connected to the detection unit, and the other end is connected to the first interface.

[0009] In the technical solution of the embodiment of the present application, the housing includes a first wall. The electrode assembly is arranged inside the housing. The detection unit is arranged inside the housing to detect information of the electrode assembly. The adapter assembly is arranged on the first wall, and the adapter assembly includes a first interface and a second interface, and the second interface is used to connect to a second wire arranged outside the battery cell. The first wire is arranged inside the housing, one end of the first wire is connected to the detection unit, and the other end is connected to the first interface. The adapter assembly provides a physical path for the detection unit inside the battery cell and the battery management system outside the battery cell, so that the detection signal obtained by the detection unit inside the battery cell can be transmitted to the battery management system in a timely manner by the first wire, the first interface, the second interface and the second wire in sequence. This enables the battery to form a risk control mechanism of early warning, early isolation and early disposal, thereby improving the reliability of the battery during use.

[0010] In some embodiments, a through hole is provided on the first wall, and the adapter assembly is inserted through the through hole. Inserting the adapter assembly through the through hole not only serves as an assembly reference for the adapter assembly, improving assembly efficiency, but also seals the through hole, improving the sealing of the battery cell to a certain extent.

[0011] 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 is located on the inner side of the first wall, and at least a portion of the second adapter plate is located on the outer side of the first wall. A first interface is provided on the first adapter plate, and a second interface is provided on the second adapter plate. The first adapter plate and the second adapter plate are electrically connected. The electrical connection between the first wire and the first adapter plate and the second wire and the second adapter plate can be completed first, and then the electrical connection between the first adapter plate and the second adapter plate can be completed. This reduces the assembly operations that need to be completed in the narrow space inside the battery cell, and reduces the difficulty of assembling the battery cell.

[0012] 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. This design provides ample assembly space for connecting the first wire to the first interface and the second wire to the second interface, thereby reducing the difficulty of assembling the battery cells.

[0013] In some embodiments, the adapter assembly further includes a docking wire, which is disposed through the through-hole. A third interface is provided on the side of the first adapter plate facing the first wall, and a fourth interface is provided on the side of the second adapter plate facing the first wall. One end of the docking wire is connected to the third interface, and the other end of the docking wire is connected to the fourth interface. The electrical connection between the first adapter plate and the second adapter plate via the docking wire reduces the risk of electromagnetic interference on the transmitted signal and improves the strength of the transmitted signal.

[0014] In some embodiments, the adapter assembly further includes a first seal disposed between the first adapter plate and the first wall, the first seal surrounding the through-hole; and / or the adapter assembly further includes a second seal disposed between the second adapter plate and the first wall, the second seal surrounding the through-hole. The first and second seals enhance the seal between the adapter assembly and the first wall, reduce the risk of foreign matter entering the battery cell through the through-hole, and thereby causing abnormalities such as a short circuit in the battery cell, thereby improving the reliability of the battery cell during use.

[0015] 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 that cooperates 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 is provided with a second positioning protrusion that cooperates with the second positioning hole. The cooperation between the first positioning hole and the first positioning protrusion, and / or the cooperation between the second positioning hole and the second positioning protrusion, reduces the difficulty of assembling the first adapter plate and the second adapter plate with the first wall.

[0016] In some embodiments, the first positioning hole is provided on the first adapter plate, the first positioning protrusion is provided on the first wall, and the first positioning protrusion is welded to the first adapter plate. The welding operation can be performed from the side of the first adapter plate facing away from the first wall, which provides a larger operating space and reduces the assembly difficulty.

[0017] In some embodiments, the second positioning hole is provided on the second adapter plate, the second positioning protrusion is provided on the first wall, and the second positioning protrusion is welded to the second adapter plate. The welding operation can be performed from the side of the second adapter plate facing away from the first wall, which provides a larger operating space and reduces the assembly difficulty.

[0018] In some embodiments, the maximum thickness of the first adapter plate is T, satisfying: T ≤ 5 mm. In some embodiments, the minimum distance between the first wall and the electrode assembly is generally 5 mm. The maximum thickness of the first adapter plate is set within a reasonable range to ensure that the first adapter plate meets actual working conditions and reduce additional costs.

[0019] In some embodiments, the first adapter plate and the second adapter plate have the same structure. This design saves design, processing and assembly costs.

[0020] In some embodiments, the battery cell further includes an electrode terminal, which is disposed on the first wall. 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. This design reduces the risk of the adapter assembly protruding too high from the outer surface of the first wall, thereby increasing the difficulty of assembling the electrode terminal with the battery's current collector.

[0021] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the first wall. Along the thickness of the first wall, the projection of the adapter assembly and the projection of the pressure relief mechanism do not overlap. This design reduces the risk of the adapter assembly interfering with the normal pressure relief of the pressure relief mechanism in the event of thermal runaway of the battery cell.

[0022] In some embodiments, the housing includes a shell and an end cap, the shell having an opening, the end cap sealing the opening, and the first wall serving as the end cap. Compared to a solution where the adapter is gradually disposed on a side wall of the housing, this reduces the risk of electrolyte soaking the adapter assembly and damaging the first and second interfaces of the adapter assembly.

[0023] In some embodiments, the battery cell also includes a protective film that wraps the electrode assembly. The detection unit is formed on the protective film by spraying, screen printing, or 3D printing. This design allows the detection unit to be assembled simultaneously with the production of the protective film, improving assembly efficiency.

[0024] In some embodiments, the detection unit includes a circuit and an insulating layer, with the circuit located between the insulating layer and the protective film. This design makes the protective film part of the detection unit, reducing the space occupied by the detection unit and the protective film within the battery cell and improving the group margin within the battery cell.

[0025] In some embodiments, the circuit is formed on the protective film by spraying, screen printing, or 3D printing, and the insulating layer is also formed on the protective film by spraying, screen printing, or 3D printing. The detection unit adopts the above-mentioned forming methods, so that after the protective film is processed, the circuit does not protrude from the protective film, thereby reducing the risk of single-point overvoltage in the electrode assembly caused by the circuit protruding from the protective film.

[0026] In some embodiments, the detection unit is located between the electrode assembly and the inner surface of the housing and is connected to the housing. The detection unit uses the housing as an assembly base, and the assembly cost is low.

[0027] In some embodiments, a plurality of detection units are provided, and the first conductive wire 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.

[0028] In a second aspect, the present application provides a battery comprising a battery management system and the battery cells of the above embodiment, wherein the second interface of the adapter assembly is connected to the battery management system via a second wire.

[0029] In a third aspect, the present application provides an electrical device, which includes the battery cell in the above embodiment, and the battery cell is used to provide electrical energy; and / or the electrical device includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0032] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0033] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0034] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0035] FIG4 is an exploded view of a portion of a battery cell according to some embodiments of the present application;

[0036] FIG5 is a bottom view of a first adapter plate according to some embodiments of the present application;

[0037] FIG6 is a top view of a first adapter plate according to some embodiments of the present application;

[0038] FIG7 is a front view of a first adapter plate according to some embodiments of the present application;

[0039] FIG8 is an isometric view of a second adapter plate according to some embodiments of the present application;

[0040] FIG. 9 is a top view of a first wall according to some embodiments of the present application.

[0041] The reference numerals in the specific embodiment are as follows: 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery; 11 - housing; 111 - first part; 112 - second part; 12-battery cell; 121-shell; 1211-end cover; 1212-shell; 1213-first wall; 12131-through hole; 122-electrode assembly; 123-protective film; 124-adapter; 125-electrode terminal; 126-detection unit; 127-adapter assembly; 1271-first adapter plate; 12711-first interface; 12712-third interface; 1272-second adapter plate; 12721-second interface; 12722-fourth interface; 1273-docking wire; 1274-first seal; 1275-second seal; 1276-first positioning hole; 1277-second positioning hole; 128-first wire; 129-second wire; 1210-pressure relief mechanism. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may 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 refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0049] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of a battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shapes. Battery cells, depending on the packaging method, may include, but are not limited to, cylindrical battery cells, prismatic battery cells, and soft-pack battery cells.

[0050] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a 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 installed in the electric vehicle. The battery mentioned in the embodiments 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 box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0051] The following description will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0052] In a typical battery cell structure, the battery cell includes a housing component, an electrode assembly, and an electrolyte. The housing component can be an end cap or a shell, and the end cap closes an opening of the shell to define a receiving space for receiving the electrode assembly.

[0053] The electrode assembly is housed in the housing. It includes a positive electrode sheet, a negative electrode sheet, and a separator. Battery cells primarily operate by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, serving as the negative electrode tab. The negative electrode collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination.

[0054] The tab generally draws out the electrical energy of the electrode assembly by being electrically connected to a conductive member. In some cases, the conductive member is a transition piece connecting the tab and the electrode terminal. In other cases, the conductive member is the electrode terminal.

[0055] Electrode terminals generally include positive and negative electrode terminals. For rectangular battery cells, the electrode terminals are generally located in the end caps. In some other cases, the electrode terminals may also be located in the housing. Multiple battery cells are connected in series and / or in parallel via the electrode terminals and a busbar for various applications. The busbar may be referred to as a busbar. In some embodiments, the electrode terminals are welded to the busbar to form an electrical connection.

[0056] For battery cells, the primary safety risk comes from the charging and discharging processes, along with appropriate ambient temperature design. To effectively avoid unnecessary damage, battery cells generally have at least three layers of protection. Specifically, these protections include at least a switch element, appropriate separator material, and a pressure relief mechanism. A pressure relief mechanism is an element or component that activates to release the internal pressure or temperature when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold. This threshold design varies depending on the design requirements. The threshold may depend on one or more of the materials used in the battery cell's positive and negative electrode plates, electrolyte, and separator. The pressure relief mechanism can take the form of an explosion-proof valve, gas valve, pressure relief valve, or safety valve, and can specifically employ pressure- or temperature-sensitive elements or structures. That is, when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold, the pressure relief mechanism activates or a weakened structure within the pressure relief mechanism is destroyed, creating an opening or channel for the internal pressure or temperature to be released.

[0057] "Actuation," as used in this application, refers to the action or activation of the pressure relief mechanism to a specific state, thereby releasing the internal pressure and temperature of the battery cell. When the pressure relief mechanism is activated, high-temperature, high-pressure substances within the battery cell are discharged from the activated portion as exhaust. This allows pressure and temperature relief within the battery cell to occur under controlled pressure or temperature, thereby preventing potentially more serious accidents.

[0058] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery during use must also be considered.

[0059] The method for battery safety monitoring is usually to deploy voltage, current, temperature, stress, and gas detection units on the control board outside the battery cell or battery module, and then report the data collected by the detection units to the main controller, which makes abnormal diagnosis and processing. However, due to the obstruction of the metal shell of the battery cell, the external signal cannot timely feedback the internal changes. Once the failure warning signals such as lithium plating and short circuit appear inside the battery cell, the main controller outside the battery cell cannot feedback these warning signals in time, and it is impossible to form an early warning, early isolation, and early disposal risk control mechanism. This makes the battery less reliable when used. However, when the detection unit is deployed inside the battery, it will face the problem of tight space constraints inside the battery and how to transmit the internal signal to the outside of the battery.

[0060] In view of this, the present application provides a battery cell, which includes a shell, an electrode assembly, a detection unit, a adapter assembly and a first wire, and the shell includes a first wall. The electrode assembly is arranged inside the shell. The detection unit is arranged inside the shell to detect information of the electrode assembly. The adapter assembly is arranged on the first wall, and the adapter assembly includes a first interface and a second interface, and the second interface is used to connect to the second wire arranged outside the battery cell. The first wire is arranged inside the shell, one end of the first wire is connected to the detection unit, and the other end is connected to the first interface. The adapter assembly provides a physical path between the detection unit inside the battery cell and the battery management system outside the battery cell, so that the detection signal obtained by the detection unit inside the battery cell can be transmitted to the battery management system in a timely manner by the first wire, the first interface, the second interface and the second wire in sequence. This enables the battery to form a risk control mechanism of early warning, early isolation and early disposal, thereby improving the reliability of the battery during use.

[0061] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0062] Electrical equipment includes, but is not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0064] For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 300, a controller 200, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] To meet different power requirements, the battery 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0066] For example, referring to FIG. 2 , FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a plurality of battery cells 12. The battery 100 may also include a housing 11 having a hollow interior, and the plurality of battery cells 12 are housed within the housing 11. As shown in FIG. 2 , these are referred to herein as a first portion 111 and a second portion 112, respectively. The first portion 111 and the second portion 112 are fastened together. The shapes of the first portion 111 and the second portion 112 may be determined based on the combined shape of the plurality of battery cells 12. The first portion 111 and the second portion 112 may each have a single opening. For example, the first portion 111 and the second portion 112 may each be a hollow rectangular parallelepiped, each with only one open face. The opening of the first portion 111 and the opening of the second portion 112 are arranged opposite each other, and the first portion 111 and the second portion 112 are fastened together to form the housing 11 having a closed chamber. The plurality of battery cells 12 are then arranged in parallel, in series, or in a mixed configuration and then placed within the housing 11 formed by the fastening of the first portion 111 and the second portion 112.

[0067] Optionally, the battery 100 may also include other structures, which are not described in detail here. For example, the battery may also include a busbar assembly, which is used to electrically connect multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar assembly can achieve electrical connection between the battery cells 12 by connecting to the electrode terminals 125 of the battery cells 12. Furthermore, the busbar assembly can be fixed to the electrode terminals 125 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the casing 11 via a conductive mechanism.

[0068] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0069] Please refer to Figure 3, which is an exploded view of a battery cell 12 in some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a housing 1212. The multiple walls of the housing 1212, i.e., the multiple walls of the housing 121, form a cavity, which can be used to accommodate the electrode assembly 122. The housing 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the housing 1212 can be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the housing 1212 has an opening so that one or more electrode assemblies 122 can be placed in the housing 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

[0070] The battery cell 12 may also include two electrode terminals 125, which may be provided on the end cap 1211. The end cap 1211 is generally in the shape of a flat plate, and the two electrode terminals 125 are fixed to the flat surface of the end cap 1211. The two electrode terminals 125 are respectively a positive electrode terminal and a negative electrode terminal. Each electrode terminal 125 is provided with a corresponding adapter 124, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 125. In the battery cell 12, the electrode assembly 122 may be provided as a single electrode assembly or as multiple electrode assemblies according to actual use requirements. A plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0071] According to some embodiments of the present application, please refer to Figures 3 and 4. The present application provides a battery cell 12, which includes a shell 121, an electrode assembly 122, a detection unit 126, a adapter assembly 127 and a first wire 128. The shell 121 includes a first wall 1213. The electrode assembly 122 is arranged inside the shell 121. The detection unit 126 is arranged inside the shell 121 for detecting information of the electrode assembly 122. The adapter assembly 127 is arranged on the first wall 1213, and the adapter assembly 127 includes a first interface 12711 and a second interface 12721. The second interface 12721 is used to connect to a second wire 129 arranged outside the battery cell 12. The first wire 128 is arranged inside the shell 121, and one end of the first wire 128 is connected to the detection unit 126, and the other end is connected to the first interface 12711.

[0072] The outer shell 121 generally includes a housing 1212 and an end cap 1211. The housing 1212 has an opening, and the end cap 1211 closes the opening to form a storage space for accommodating the electrode assembly 122. The interior of the outer shell 121 generally refers to the interior of the storage space, and the exterior of the outer shell 121 generally refers to the exterior of the storage space. The first wall 1213 can be either the end cap 1211 or a wall of the outer shell 1212.

[0073] The first interface 12711 and the second interface 12721 can be wire connectors or cable plug interfaces, and can also be understood as solder joints for forming electrical connections with conductive parts.

[0074] The detection unit 126 can be a thin film sensor, generally including an insulating layer, a circuit and a substrate. The circuit generally includes a sensitive layer and electrodes. The sensitive layer is a powdered substance usually made of oxide particles or nanomaterials. Changes in the resistance of the sensitive layer can reflect information such as the pressure, stress, temperature of the electrode assembly 122, and the gas pressure of the electrode assembly 122. The electrode is used to convert the resistance change of the sensitive layer into an electrical signal. The electrode is generally electrically connected to the second wire 129 and the host computer.

[0075] The shape, size and precision of the detection unit 126 can be adjusted according to detection requirements.

[0076] In some embodiments, multiple detection units 126 can be provided, and multiple detection units 126 are distributed on the entire outer surface of the electrode assembly 122. Multiple detection units 126 formed on the protective film 123 will form multiple detection areas. Each detection area can obtain the expansion force, and / or stress and / or air pressure, and / or temperature and other sensing signals of multiple points of the electrode assembly 122, thereby realizing the detection of signals such as the expansion force of the electrode assembly 122, the stress of the electrode assembly 122, the air pressure inside the battery cell 12, and the temperature of the electrode assembly 122. The above-mentioned signals can be transmitted to the host computer for processing through wires, etc. During the battery 100 testing process, the host computer can be a computer, processor, etc. During the use of the battery 100, the host computer can be the battery management system of the battery 100. After processing the above-mentioned sensor signals, the battery management system can present the regionalized expansion force of the electrode assembly 122, the stress of the electrode assembly 122, the air pressure inside the battery cell 12, and the distribution diagram of the temperature of the electrode assembly 122 and the corresponding specific values, and conduct comparative analysis on the information of each area, and perform targeted warnings and other operations for areas with abnormal information.

[0077] By leading out the signal of the detection unit 126 through the adapter assembly 127 , the wire used to transmit the signal of the detection unit 126 can be at least partially located inside the first wall 1213 , saving space inside the battery 100 to a certain extent.

[0078] In the technical solution of the embodiment of the present application, the housing 121 includes a first wall 1213. The electrode assembly 122 is disposed within the housing 121. The detection unit 126 is disposed within the housing 121 to detect information from the electrode assembly 122. The adapter assembly 127 is disposed within the first wall 1213 and includes a first interface 12711 and a second interface 12721. The second interface 12721 is configured to connect to a second wire 129 disposed outside the battery cell 12. A first wire 128 is disposed within the housing 121. One end of the first wire 128 is connected to the detection unit 126, and the other end is connected to the first interface 12711. The adapter assembly 127 provides a physical pathway between the detection unit 126 within the battery cell 12 and the battery management system outside the battery cell 12. This allows the detection signal obtained by the detection unit 126 within the battery cell 12 to be transmitted to the battery management system in a timely manner via the first wire 128, the first interface 12711, the second interface 12721, and the second wire 129. This enables the battery 100 to form a risk control mechanism of early warning, early isolation, and early disposal, thereby improving the reliability of the battery 100 during use.

[0079] According to some embodiments of the present application, referring to FIG. 4 , a through hole 12131 is provided on the first wall 1213 , and the adapter component 127 is passed through the through hole 12131 .

[0080] The adapter assembly 127 is inserted into the through hole 12131, meaning that a portion of the adapter assembly 127 is located within the through hole 12131, another portion of the adapter assembly 127 is located inside the first wall 1213, and the remaining portion of the adapter assembly 127 is located outside the first wall 1213. The inside of the first wall 1213 generally refers to the interior of the accommodation space, and the outside of the first wall 1213 generally refers to the exterior of the accommodation space.

[0081] In some embodiments, after the adapter component 127 is inserted into the through hole 12131 , the adapter component 127 generally closes the through hole 12131 at the same time.

[0082] The adapter assembly 127 is passed through the through hole 12131. On the one hand, the through hole 12131 can be used as an assembly reference for the adapter assembly 127 to improve the assembly efficiency of the adapter assembly 127. On the other hand, the adapter assembly 127 also closes the through hole 12131, thereby improving the sealing of the battery cell 12 to a certain extent.

[0083] According to some embodiments of the present application, please refer to Figures 4 and 5, 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, and at least a portion of the second adapter plate 1272 is located on the outer side of the first wall 1213, the first interface 12711 is set on the first adapter plate 1271, and the second interface 12721 is set on the second adapter plate 1272, and the first adapter plate 1271 and the second adapter plate 1272 are electrically connected.

[0084] 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.

[0085] The structures of the first adapter plate 1271 and the second adapter plate 1272 may be the same or different.

[0086] The first interface 12711 can be disposed within the first adapter plate 1271, that is, in the thickness direction of the first adapter plate 1271, and the first interface 12711 does not protrude from the surface of the first adapter plate 1271. The second interface 12721 can be disposed within the second adapter plate 1272, that is, in the thickness direction of the second adapter plate 1272, and the second interface 12721 does not protrude from the surface of the second adapter plate 1272.

[0087] The first adapter plate 1271 can be connected to the first wall 1213 by welding or fasteners. The second adapter plate 1272 can be connected to the first wall 1213 by welding or fasteners.

[0088] When the first adapter board 1271 and the second adapter board 1272 are electrically connected, at least a portion of the first adapter board 1271 and / or at least a portion of the second adapter board 1272 is located in the through hole 12131 .

[0089] In some embodiments, the first adapter board 1271 and the second adapter board 1272 can be directly plugged into each other to form an electrical connection, the first interface 12711 is a flat cable, and the second interface 12721 is a flat cable plug-in interface; or, the first interface 12711 is a flat cable plug-in interface, and the second interface 12721 is a flat cable.

[0090] The electrical connection between the first wire 128 and the first adapter plate 1271 and the second wire 129 and the second adapter plate 1272 can be completed first. Then, the electrical connection between the first adapter plate 1271 and the second adapter plate 1272 can be completed to achieve the electrical connection between the first wire 128 and the second wire 129. This reduces the number of assembly operations required within the relatively narrow space within the battery cell 12, thereby reducing the difficulty of assembling the battery cell 12.

[0091] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5 , the first interface 12711 is disposed on a side of the first adapter plate 1271 away from the first wall 1213 , and the second interface 12721 is disposed on a side of the second adapter plate 1272 away from the first wall 1213 .

[0092] Since the first adapter plate 1271 and the second adapter plate 1272 are connected to the first wall 1213 and are basically in contact with the first wall 1213, the side of the first adapter plate 1271 facing away from the first wall 1213 and the side of the second adapter plate 1272 facing away from the first wall 1213 have a relatively large assembly space.

[0093] 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. This means that the connection between the first interface 12711 and the first wire 128 and the connection between the second interface 12721 and the second wire 129 can be completed after the first adapter plate 1271 and the second adapter plate 1272 are connected to the first wall 1213.

[0094] 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. This design provides ample assembly space when connecting the first wire 128 to the first interface 12711 and when connecting the second wire 129 to the second interface 12721, thereby reducing the difficulty of assembling the battery cell 12.

[0095] According to some embodiments of the present application, please refer to Figures 4 to 8, the adapter assembly 127 also includes a docking line 1273, the docking line 1273 is passed through the through hole 12131, and a third interface 12712 is provided on the side of the first adapter plate 1271 facing the first wall 1213, and a fourth interface 12722 is provided on the 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.

[0096] The docking wire 1273 can be a wire or a flat cable.

[0097] In the example of the docking wire 1273 being a wiring arrangement, the docking wire 1273 generally includes a lead and pins. The pins are integrated on the lead, and the number of the pins is generally greater than or equal to two.

[0098] After the first wire 128 is connected to the first adapter plate 1271, the assembly process of the first adapter plate 1271, the docking wire 1273, and the second adapter plate 1272 is roughly as follows: First, connect the first adapter plate 1271 and the docking wire 1273, and allow the docking wire 1273 to pass through the first wall 1213 from bottom to top through the through hole 12131. Next, fix the first adapter plate 1271 to the inside of the first wall 1213 so that the first wall 1213 and the first adapter plate 1271 are tightly joined. Then, connect the docking wire 1273 and the second adapter plate 1272, and fix the second adapter plate 1272 to the outside of the first wall 1213. After the second wire 129 is connected to the second interface 12721, the signal of the internal detection unit 126 of the battery cell 12 can be led to the outside of the battery cell 12 through the adapter assembly 127.

[0099] Transmitting the detection unit 126 signal via the first wire 128, the second wire 129, and the docking wire 1273 reduces the risk of data loss due to wireless transmission. This also improves data transmission rate and efficiency. The detection unit 126 can also be powered directly by a power source external to the battery cell 12 via the docking wire 1273, reducing the risk of power loss within the battery cell 12.

[0100] The first adapter board 1271 and the second adapter board 1272 are electrically connected via the docking line 1273 , thereby reducing the risk of electromagnetic environment interference on the transmission signal and improving the strength of the transmission signal.

[0101] According to some embodiments of the present application, please refer to Figures 4 to 8, the adapter assembly 127 also includes a first seal 1274, which is arranged between the first adapter plate 1271 and the first wall 1213, and the first seal 1274 is arranged around the through hole 12131; and / or, the adapter assembly 127 also includes a second seal 1275, which is arranged between the second adapter plate 1272 and the first wall 1213, and the second seal 1275 is arranged around the through hole 12131.

[0102] The material of the first sealing member 1274 and / or the second sealing member 1275 may include but is not limited to polyvinyl chloride, polyimide, etc.

[0103] The first sealing member 1274 may be an independent sealing ring or a sealing portion formed on the first adapter plate 1271 . The second sealing member 1275 may be an independent sealing ring or a sealing portion formed on the second adapter plate 1272 .

[0104] The first seal 1274 and the second seal 1275 improve the sealing performance of the adapter assembly 127 when it cooperates with the first wall 1213, reduce the risk of foreign matter entering the battery cell 12 through the through hole 12131, causing abnormal conditions such as short circuit in the battery cell 12, and improve the reliability of the battery cell 12 during use.

[0105] According to some embodiments of the present application, please refer to Figures 4 to 8, a first positioning hole 1276 is provided on one of the first wall 1213 and the first adapter plate 1271, and a first positioning protrusion that cooperates with the first positioning hole 1276 is provided on the other; and / or, a second positioning hole 1277 is provided on one of the first wall 1213 and the second adapter plate 1272, and a second positioning protrusion that cooperates with the second positioning hole 1277 is provided on the other.

[0106] The number of the first positioning hole 1276 and / or the second positioning hole 1277 can be one or more. The first positioning hole 1276 and / or the second positioning hole 1277 can be a through hole 12131 or a blind hole.

[0107] The above-mentioned fitting means that at least part of the protrusion is located in the hole.

[0108] The cooperation between the first positioning hole 1276 and the first positioning protrusion, and / or the cooperation between the second positioning hole 1277 and the second positioning protrusion, reduces the difficulty of assembling the first adapter plate 1271 and the second adapter plate 1272 with the first wall 1213 .

[0109] According to some embodiments of the present application, referring to FIG. 4 to FIG. 6 , the first positioning hole 1276 is provided on the first adapter plate 1271 , the first positioning protrusion is provided on the first wall 1213 , and the first positioning protrusion is welded to the first adapter plate 1271 .

[0110] The welding between the first protrusion and the first adapter plate 1271 can be multi-point welding or circumferential welding.

[0111] The welding operation can be performed from the side of the first adapter plate 1271 away from the first wall 1213 , which provides a larger operating space and reduces the difficulty of assembly.

[0112] According to some embodiments of the present application, referring to FIG. 4 and FIG. 8 , the second positioning hole 1277 is provided on the second adapter plate 1272 , the second positioning protrusion is provided on the first wall 1213 , and the second positioning protrusion is welded to the second adapter plate 1272 .

[0113] The welding between the second protrusion and the second adapter plate 1272 can be multi-point welding or circumferential welding.

[0114] The welding operation can be performed from the side of the second adapter plate 1272 away from the first wall 1213, which provides a larger operating space and reduces the difficulty of assembly.

[0115] According to some embodiments of the present application, referring to FIG. 7 , the maximum thickness of the first adapter plate 1271 is T, satisfying: T≤5 mm.

[0116] The maximum thickness of the first adapter plate 1271 generally refers to the maximum dimension of the first adapter plate 1271 in the thickness direction of the first adapter plate 1271 .

[0117] The maximum thickness T of the first adapter plate 1271 can be any value greater than 0 and less than or equal to 5, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm.

[0118] In some embodiments, the minimum distance between the first wall 1213 and the electrode assembly 122 is generally 5 mm. The maximum thickness of the first adapter plate 1271 is set within a reasonable range to make the first adapter plate 1271 meet actual working conditions and reduce additional costs.

[0119] According to some embodiments of the present application, referring to FIG. 4 to FIG. 8 , the first adapter plate 1271 and the second adapter plate 1272 have the same structure.

[0120] In some embodiments, the first adapter plate 1271 and the second adapter plate 1272 have the same structure and are symmetrically arranged with respect to the first wall 1213 .

[0121] The first adapter plate 1271 and the second adapter plate 1272 have the same structure. This design saves design, processing and assembly costs.

[0122] According to some embodiments of the present application, the battery cell 12 further includes an electrode terminal 125, which is disposed on the first wall 1213. The height of the adapter assembly 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. This design reduces the risk that the adapter assembly 127 protruding too high from the outer surface of the first wall 1213 would increase the difficulty of assembling the electrode terminal 125 with the busbar of the battery 100.

[0123] 3 and 9 , the battery cell 12 further includes a pressure relief mechanism 1210 disposed on the first wall 1213. Along the thickness direction of the first wall 1213, the projection of the adapter assembly 127 does not overlap with the projection of the pressure relief mechanism 1210.

[0124] The pressure relief mechanism 1210 can be various possible pressure relief structures. For example, the pressure relief mechanism 1210 can be a temperature-sensitive pressure relief mechanism, which is 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 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal air pressure of the battery cell 12 provided with the pressure relief mechanism 1210 reaches a threshold value.

[0125] 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. This 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 cell 12.

[0126] According to some embodiments of the present application, referring to FIG. 3 , the housing 121 includes a shell 1212 and an end cover 1211 . The shell 1212 has an opening, the end cover 1211 closes the opening, and the first wall 1213 serves as the end cover 1211 .

[0127] In some embodiments, the end cover 1211 closes the opening and the rear end cover 1211 is connected to the housing 1212 by welding.

[0128] Compared with the solution in which the adapter is gradually provided on the side wall of the housing 121 , the risk of the first interface 12711 and the second interface 12721 of the adapter component 127 being damaged by the electrolyte soaking the adapter component 127 can be reduced.

[0129] According to some embodiments of the present application, referring to FIG. 3 , the battery cell 12 further includes a protective film 123 , which 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.

[0130] The detection unit 126 is formed on the protective film 123 at the same time as the protective film 123 is produced. The protective film 123 can serve as an insulating layer and / or substrate for the detection unit 126, while also maintaining the thickness of the protective film 123 substantially unchanged. This improves the group margin of the battery cell 12, which can be understood as the percentage of the internal space of the battery cell 12 occupied by the electrode assembly 122.

[0131] The detection unit 126 can be formed on two surfaces of the protective film 123 along the thickness direction thereof or inside the protective film 123 .

[0132] Spraying can be called a powder spraying process. Powder spraying equipment can be used to spray different raw materials onto the carrier platform. After the powder solidifies and forms, a layered structure is formed, such as the insulating layer, circuit, substrate, etc. of the detection unit 126.

[0133] The screen printing process can print the circuit onto the substrate. After printing is completed, the circuit can be formed on the protective film 123 by heating and curing. Then, the insulating layer is attached to the substrate, and the insulating layer, circuit and substrate are formed into an integrated structure through processes such as hot pressing. The protective film 123 can serve as a substrate and / or an insulating layer. In the embodiment where the protective film 123 serves as the substrate and the insulating layer, the substrate, the insulating layer and the circuit can be used as a three-layer structure, and the protective film 123 can be formed by a hot pressing process. The thickness of the protective film 123 can be basically consistent with the thickness of the protective film 123 prepared by conventional methods.

[0134] The detection unit 126 can be formed on the protective film 123 by first using a 3D printing device to print the base, then replacing the powder to print the circuit on the base, and finally replacing the powder again to cover the circuit and the base with an insulating layer.

[0135] Such a design enables the assembly of the detection unit 126 to be completed while the protective film 123 is being produced, thereby improving assembly efficiency.

[0136] According to some embodiments of the present application, referring to FIG. 3 , 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 .

[0137] The circuit is located between the insulating layer and the protective film 123, which means that the detection unit 126 does not need a base and only needs to include the circuit and the insulating layer, reducing its overall thickness. Alternatively, it can be understood that the protective film 123 serves as the base of the detection unit 126, that is, the protective film 123 is part of the detection unit 126.

[0138] The detection unit 126 includes a circuit and an insulating layer. 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, reducing the space occupied by the detection unit 126 and the protective film 123 inside the battery cell 12 and improving the group margin inside the battery cell 12.

[0139] This design makes the protective film 123 a part of the detection unit 126 , reduces the space inside the battery cell 12 occupied by the detection unit 126 and the protective film 123 , and improves the group margin inside the battery cell 12 .

[0140] 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.

[0141] 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, and the circuit is located between the insulating layer and the protective film 123. The gaps between adjacent circuits can be filled with powder to form the insulating layer through the above process, so that the circuit will not protrude from the protective film 123. At the same time, the number of stress concentration points on the protective film 123 will also be reduced, reducing the risk of single-point overvoltage of the electrode assembly 122.

[0142] The detection unit 126 adopts the above-mentioned molding method, so that after the protective film 123 is processed, the circuit will not protrude from the protective film 123, thereby reducing the risk of single-point overvoltage of the electrode assembly 122 caused by the circuit protruding from the protective film 123.

[0143] According to some embodiments of the present application, referring to FIG. 3 , the detection unit 126 is located between the electrode assembly 122 and the inner surface of the housing 121 and is connected to the housing 121 .

[0144] In some embodiments, the detection unit 126 may be fixed to the inner surface of the housing 121 by fasteners such as bolts.

[0145] The detection unit 126 uses the housing 121 as an assembly base, and the assembly cost is low.

[0146] According to some embodiments of the present application, a plurality of detection units 126 are provided, 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.

[0147] According to some embodiments of the present application, a battery 100 is provided, comprising a battery management system and a battery cell 12 as described in any of the above solutions, wherein the second interface 12721 of the adapter component 127 is connected to the battery management system via a second wire 129 .

[0148] According to some embodiments of the present application, the present application provides an electrical device, which includes the battery cell 12 described in any of the above schemes, and the battery cell 12 is used to provide electrical energy; and / or the electrical device includes the battery 100 described in any of the above schemes, and the battery 100 is used to provide electrical energy.

[0149] According to some embodiments of the present application, with reference to Figures 3 to 9, the present application provides a battery cell 12, which includes a housing 121, an electrode assembly 122, a detection unit 126, a switching assembly 127, and a first wire 128. The housing 121 includes a shell 1212 and an end cover 1211. The shell 1212 has an opening, and the end cover 1211 closes the opening. The electrode assembly 122 is arranged inside the housing 121. The battery cell 12 also includes a protective film 123, which is used to wrap the electrode assembly 122. The detection unit 126 is formed on the protective film 123 by spraying, screen printing, or 3D printing. The detection unit 126 is arranged inside the housing 121 to detect information of the electrode assembly 122.

[0150] The adapter assembly 127 is mounted on the end cap 1211 and includes a first interface 12711 and a second interface 12721. The second interface 12721 is used to connect to a second wire 129 disposed on the outside of the battery cell 12. A first wire 128 is disposed within the housing 121. One end of the first wire 128 is connected to the detection unit 126, and the other end is connected to the first interface 12711. The end cap 1211 is provided with a through hole 12131, through which the adapter assembly 127 is inserted.

[0151] 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 have identical structures. At least a portion of the first adapter plate 1271 is located inside the end cap 1211, while at least a portion of the second adapter plate 1272 is located outside the end cap 1211. A first interface 12711 is provided on the first adapter plate 1271, and a second interface 12721 is provided on the second adapter plate 1272. The first adapter plate 1271 and the second adapter plate 1272 are electrically connected via a docking wire 1273.

[0152] The docking line 1273 is passed through the through hole 12131, and a third interface 12712 is provided on the side of the first adapter plate 1271 facing the end cover 1211, and a fourth interface 12722 is provided on the 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.

[0153] The adapter assembly 127 also includes a first seal 1274 and a second seal 1275. The first seal 1274 is arranged between the first adapter plate 1271 and the end cover 1211, and the first seal 1274 surrounds the through hole 12131. The second seal 1275 is arranged between the second adapter plate 1272 and the end cover 1211, and the second seal 1275 surrounds the through hole 12131.

[0154] The first adapter plate 1271 is provided with a first positioning hole 1276, a first positioning protrusion is provided on the end cover 1211, and the first positioning protrusion is welded to the first adapter plate 1271. The second adapter plate 1272 is provided with a second positioning hole 1277, a second positioning protrusion is provided on the end cover 1211, and the second positioning protrusion is welded to the second adapter plate 1272.

[0155] The battery cell 12 also includes an electrode terminal 125, which is mounted on an end cap 1211. The height of the adapter assembly 127 protruding from the outer surface of the end cap 1211 does not exceed the height of the electrode terminal 125 protruding from the outer surface of the end cap 1211. The battery cell 12 also includes a pressure relief mechanism 1210, which is mounted on the end cap 1211. Along the thickness direction of the end cap 1211, the projection of the adapter assembly 127 does not overlap with the projection of the pressure relief mechanism 1210.

[0156] When the adapter assembly 127 is used on a battery cell 12 measuring 141 mm × 50 mm × 95 mm (length × width × height), the end cap 1211 measures 141 mm × 50 mm (length × width). The docking wire 1273 has 13 pins, each 1 mm wide. The docking wire 1273 measures 30 mm × 5 mm (length × width). The first and second adapter plates 1271 and 1272 measure 10 mm × 4.5 mm (length × width). The through hole 12131 is 30 mm wide.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, wherein: include: a housing including a first wall; An electrode assembly, disposed inside the housing; A detection unit, disposed inside the housing, for detecting information of the electrode assembly; An adapter assembly, disposed on the first wall, the adapter assembly comprising a first interface and a second interface, the second interface being used to connect to a second wire disposed outside the battery cell; A first wire is arranged inside the housing, one end of the first wire is connected to the detection unit, and the other end of the first wire is connected to the first interface.

2. The battery cell according to claim 1, wherein: The first wall is provided with a through hole, and the adapter assembly is passed through the through hole.

3. The battery cell according to claim 2, wherein: The adapter assembly includes a first adapter plate and a second adapter plate, at least a portion of the first adapter plate is located on the inner side of the first wall, at least a portion of the second adapter plate is located on the outer side of the first wall, the first interface is arranged on the first adapter plate, the second interface is arranged on the second adapter plate, and the first adapter plate and the second adapter plate are electrically connected.

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

5. The battery cell according to claim 3 or 4, wherein: The adapter assembly also includes a docking wire, which is passed through the through hole. A third interface is provided on the side of the first adapter plate facing the first wall, and a fourth interface is provided on the side of the second adapter plate facing the first wall. One end of the docking wire is connected to the third interface, and the other end of the docking wire is connected to the fourth interface.

6. The battery cell according to any one of claims 3 to 5, wherein: The adapter assembly further includes a first seal, which is disposed between the first adapter plate and the first wall, and surrounds the through hole; And / or, the adapter assembly further includes a second seal, wherein the second seal is disposed between the second adapter plate and the first wall, and the second seal surrounds the through hole.

7. The battery cell according to any one of claims 3 to 6, wherein: A first positioning hole is provided on one of the first wall and the first adapter plate, and a first positioning protrusion matched with the first positioning hole is provided on the other one; And / or, a second positioning hole is provided on one of the first wall and the second adapter plate, and a second positioning protrusion matched with the second positioning hole is provided on the other one.

8. The battery cell according to claim 7, wherein: The first positioning hole is arranged on the first adapter plate, the first positioning protrusion is arranged on the first wall, and the first positioning protrusion is welded to the first adapter plate.

9. The battery cell according to claim 7 or 8, wherein: The second positioning hole is arranged on the second adapter plate, the second positioning protrusion is arranged on the first wall, and the second positioning protrusion is welded to the second adapter plate.

10. The battery cell according to any one of claims 3 to 9, wherein: The maximum thickness of the first adapter plate is T, satisfying: T≤5mm.

11. The battery cell according to any one of claims 3 to 10, wherein: The first adapter plate and the second adapter plate have the same structure.

12. The battery cell according to any one of claims 3 to 11, wherein: The battery cell further includes an electrode terminal, which is disposed on the first wall. 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 according to any one of claims 1 to 12, wherein: The battery cell further includes a pressure relief mechanism, which is disposed on the first wall; along the thickness direction of the first wall, a projection of the adapter assembly does not overlap with a projection of the pressure relief mechanism.

14. The battery cell according to any one of claims 1 to 13, wherein: The housing further comprises a shell and an end cover, the shell has an opening, the end cover closes the opening, and the first wall is the end cover.

15. The battery cell according to any one of claims 1 to 14, wherein: The battery cell further includes a protective film, which is used to wrap the electrode assembly. The detection unit is formed on the protective film by spraying, screen printing or 3D printing.

16. The battery cell according to claim 15, wherein: The detection unit includes a circuit and an insulating layer, and the circuit is located between the insulating layer and the protective film.

17. The battery cell according to 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 according to any one of claims 1 to 14, wherein: The detection unit is located between the electrode assembly and the inner surface of the housing and is connected to the housing.

19. The battery cell according to any one of claims 1 to 18, wherein: The detection units are provided in plurality, and the first conductive wire is a flat wire.

20. A battery, wherein: A battery management system and a battery cell as claimed in any one of claims 1 to 19; Wherein, the second interface of the adapter component is connected to the battery management system via a second wire.

21. An electrical device, wherein: The electrical equipment comprises a battery cell as claimed in any one of claims 1 to 19, wherein the battery cell is used to provide electrical energy; And / or, the electrical device comprises the battery as claimed in claim 20, wherein the battery is used to provide electrical energy.

Images